5623 lines
167 KiB
C
5623 lines
167 KiB
C
/* Expands front end tree to back end RTL for GCC.
|
||
Copyright (C) 1987, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
|
||
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
|
||
Free Software Foundation, Inc.
|
||
|
||
This file is part of GCC.
|
||
|
||
GCC is free software; you can redistribute it and/or modify it under
|
||
the terms of the GNU General Public License as published by the Free
|
||
Software Foundation; either version 2, or (at your option) any later
|
||
version.
|
||
|
||
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GCC; see the file COPYING. If not, write to the Free
|
||
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
|
||
02110-1301, USA. */
|
||
|
||
/* $FreeBSD$ */
|
||
|
||
/* This file handles the generation of rtl code from tree structure
|
||
at the level of the function as a whole.
|
||
It creates the rtl expressions for parameters and auto variables
|
||
and has full responsibility for allocating stack slots.
|
||
|
||
`expand_function_start' is called at the beginning of a function,
|
||
before the function body is parsed, and `expand_function_end' is
|
||
called after parsing the body.
|
||
|
||
Call `assign_stack_local' to allocate a stack slot for a local variable.
|
||
This is usually done during the RTL generation for the function body,
|
||
but it can also be done in the reload pass when a pseudo-register does
|
||
not get a hard register. */
|
||
|
||
#include "config.h"
|
||
#include "system.h"
|
||
#include "coretypes.h"
|
||
#include "tm.h"
|
||
#include "rtl.h"
|
||
#include "tree.h"
|
||
#include "flags.h"
|
||
#include "except.h"
|
||
#include "function.h"
|
||
#include "expr.h"
|
||
#include "optabs.h"
|
||
#include "libfuncs.h"
|
||
#include "regs.h"
|
||
#include "hard-reg-set.h"
|
||
#include "insn-config.h"
|
||
#include "recog.h"
|
||
#include "output.h"
|
||
#include "basic-block.h"
|
||
#include "toplev.h"
|
||
#include "hashtab.h"
|
||
#include "ggc.h"
|
||
#include "tm_p.h"
|
||
#include "integrate.h"
|
||
#include "langhooks.h"
|
||
#include "target.h"
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||
#include "cfglayout.h"
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||
#include "tree-gimple.h"
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||
#include "tree-pass.h"
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||
#include "predict.h"
|
||
#include "vecprim.h"
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||
|
||
#ifndef LOCAL_ALIGNMENT
|
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#define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT
|
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#endif
|
||
|
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#ifndef STACK_ALIGNMENT_NEEDED
|
||
#define STACK_ALIGNMENT_NEEDED 1
|
||
#endif
|
||
|
||
#define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT)
|
||
|
||
/* Some systems use __main in a way incompatible with its use in gcc, in these
|
||
cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
|
||
give the same symbol without quotes for an alternative entry point. You
|
||
must define both, or neither. */
|
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#ifndef NAME__MAIN
|
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#define NAME__MAIN "__main"
|
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#endif
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||
|
||
/* Round a value to the lowest integer less than it that is a multiple of
|
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the required alignment. Avoid using division in case the value is
|
||
negative. Assume the alignment is a power of two. */
|
||
#define FLOOR_ROUND(VALUE,ALIGN) ((VALUE) & ~((ALIGN) - 1))
|
||
|
||
/* Similar, but round to the next highest integer that meets the
|
||
alignment. */
|
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#define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1))
|
||
|
||
/* Nonzero if function being compiled doesn't contain any calls
|
||
(ignoring the prologue and epilogue). This is set prior to
|
||
local register allocation and is valid for the remaining
|
||
compiler passes. */
|
||
int current_function_is_leaf;
|
||
|
||
/* Nonzero if function being compiled doesn't modify the stack pointer
|
||
(ignoring the prologue and epilogue). This is only valid after
|
||
life_analysis has run. */
|
||
int current_function_sp_is_unchanging;
|
||
|
||
/* Nonzero if the function being compiled is a leaf function which only
|
||
uses leaf registers. This is valid after reload (specifically after
|
||
sched2) and is useful only if the port defines LEAF_REGISTERS. */
|
||
int current_function_uses_only_leaf_regs;
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||
|
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/* Nonzero once virtual register instantiation has been done.
|
||
assign_stack_local uses frame_pointer_rtx when this is nonzero.
|
||
calls.c:emit_library_call_value_1 uses it to set up
|
||
post-instantiation libcalls. */
|
||
int virtuals_instantiated;
|
||
|
||
/* Assign unique numbers to labels generated for profiling, debugging, etc. */
|
||
static GTY(()) int funcdef_no;
|
||
|
||
/* These variables hold pointers to functions to create and destroy
|
||
target specific, per-function data structures. */
|
||
struct machine_function * (*init_machine_status) (void);
|
||
|
||
/* The currently compiled function. */
|
||
struct function *cfun = 0;
|
||
|
||
/* These arrays record the INSN_UIDs of the prologue and epilogue insns. */
|
||
static VEC(int,heap) *prologue;
|
||
static VEC(int,heap) *epilogue;
|
||
|
||
/* Array of INSN_UIDs to hold the INSN_UIDs for each sibcall epilogue
|
||
in this function. */
|
||
static VEC(int,heap) *sibcall_epilogue;
|
||
|
||
/* In order to evaluate some expressions, such as function calls returning
|
||
structures in memory, we need to temporarily allocate stack locations.
|
||
We record each allocated temporary in the following structure.
|
||
|
||
Associated with each temporary slot is a nesting level. When we pop up
|
||
one level, all temporaries associated with the previous level are freed.
|
||
Normally, all temporaries are freed after the execution of the statement
|
||
in which they were created. However, if we are inside a ({...}) grouping,
|
||
the result may be in a temporary and hence must be preserved. If the
|
||
result could be in a temporary, we preserve it if we can determine which
|
||
one it is in. If we cannot determine which temporary may contain the
|
||
result, all temporaries are preserved. A temporary is preserved by
|
||
pretending it was allocated at the previous nesting level.
|
||
|
||
Automatic variables are also assigned temporary slots, at the nesting
|
||
level where they are defined. They are marked a "kept" so that
|
||
free_temp_slots will not free them. */
|
||
|
||
struct temp_slot GTY(())
|
||
{
|
||
/* Points to next temporary slot. */
|
||
struct temp_slot *next;
|
||
/* Points to previous temporary slot. */
|
||
struct temp_slot *prev;
|
||
|
||
/* The rtx to used to reference the slot. */
|
||
rtx slot;
|
||
/* The rtx used to represent the address if not the address of the
|
||
slot above. May be an EXPR_LIST if multiple addresses exist. */
|
||
rtx address;
|
||
/* The alignment (in bits) of the slot. */
|
||
unsigned int align;
|
||
/* The size, in units, of the slot. */
|
||
HOST_WIDE_INT size;
|
||
/* The type of the object in the slot, or zero if it doesn't correspond
|
||
to a type. We use this to determine whether a slot can be reused.
|
||
It can be reused if objects of the type of the new slot will always
|
||
conflict with objects of the type of the old slot. */
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||
tree type;
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||
/* Nonzero if this temporary is currently in use. */
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||
char in_use;
|
||
/* Nonzero if this temporary has its address taken. */
|
||
char addr_taken;
|
||
/* Nesting level at which this slot is being used. */
|
||
int level;
|
||
/* Nonzero if this should survive a call to free_temp_slots. */
|
||
int keep;
|
||
/* The offset of the slot from the frame_pointer, including extra space
|
||
for alignment. This info is for combine_temp_slots. */
|
||
HOST_WIDE_INT base_offset;
|
||
/* The size of the slot, including extra space for alignment. This
|
||
info is for combine_temp_slots. */
|
||
HOST_WIDE_INT full_size;
|
||
};
|
||
|
||
/* Forward declarations. */
|
||
|
||
static rtx assign_stack_local_1 (enum machine_mode, HOST_WIDE_INT, int,
|
||
struct function *);
|
||
static struct temp_slot *find_temp_slot_from_address (rtx);
|
||
static void pad_to_arg_alignment (struct args_size *, int, struct args_size *);
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||
static void pad_below (struct args_size *, enum machine_mode, tree);
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||
static void reorder_blocks_1 (rtx, tree, VEC(tree,heap) **);
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||
static int all_blocks (tree, tree *);
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||
static tree *get_block_vector (tree, int *);
|
||
extern tree debug_find_var_in_block_tree (tree, tree);
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||
/* We always define `record_insns' even if it's not used so that we
|
||
can always export `prologue_epilogue_contains'. */
|
||
static void record_insns (rtx, VEC(int,heap) **) ATTRIBUTE_UNUSED;
|
||
static int contains (rtx, VEC(int,heap) **);
|
||
#ifdef HAVE_return
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||
static void emit_return_into_block (basic_block, rtx);
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||
#endif
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#if defined(HAVE_epilogue) && defined(INCOMING_RETURN_ADDR_RTX)
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static rtx keep_stack_depressed (rtx);
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#endif
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static void prepare_function_start (tree);
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static void do_clobber_return_reg (rtx, void *);
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static void do_use_return_reg (rtx, void *);
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static void set_insn_locators (rtx, int) ATTRIBUTE_UNUSED;
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||
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||
/* Pointer to chain of `struct function' for containing functions. */
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||
struct function *outer_function_chain;
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||
|
||
/* Given a function decl for a containing function,
|
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return the `struct function' for it. */
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||
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struct function *
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find_function_data (tree decl)
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||
{
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||
struct function *p;
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||
|
||
for (p = outer_function_chain; p; p = p->outer)
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||
if (p->decl == decl)
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return p;
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||
gcc_unreachable ();
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||
}
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||
|
||
/* Save the current context for compilation of a nested function.
|
||
This is called from language-specific code. The caller should use
|
||
the enter_nested langhook to save any language-specific state,
|
||
since this function knows only about language-independent
|
||
variables. */
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||
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void
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push_function_context_to (tree context ATTRIBUTE_UNUSED)
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||
{
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struct function *p;
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|
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if (cfun == 0)
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init_dummy_function_start ();
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p = cfun;
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||
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p->outer = outer_function_chain;
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outer_function_chain = p;
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||
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||
lang_hooks.function.enter_nested (p);
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||
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||
cfun = 0;
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||
}
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||
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||
void
|
||
push_function_context (void)
|
||
{
|
||
push_function_context_to (current_function_decl);
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||
}
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||
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||
/* Restore the last saved context, at the end of a nested function.
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This function is called from language-specific code. */
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void
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pop_function_context_from (tree context ATTRIBUTE_UNUSED)
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||
{
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struct function *p = outer_function_chain;
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||
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cfun = p;
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outer_function_chain = p->outer;
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||
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||
current_function_decl = p->decl;
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||
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||
lang_hooks.function.leave_nested (p);
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||
/* Reset variables that have known state during rtx generation. */
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virtuals_instantiated = 0;
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generating_concat_p = 1;
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}
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void
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pop_function_context (void)
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{
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pop_function_context_from (current_function_decl);
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}
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/* Clear out all parts of the state in F that can safely be discarded
|
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after the function has been parsed, but not compiled, to let
|
||
garbage collection reclaim the memory. */
|
||
|
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void
|
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free_after_parsing (struct function *f)
|
||
{
|
||
/* f->expr->forced_labels is used by code generation. */
|
||
/* f->emit->regno_reg_rtx is used by code generation. */
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||
/* f->varasm is used by code generation. */
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||
/* f->eh->eh_return_stub_label is used by code generation. */
|
||
|
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lang_hooks.function.final (f);
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||
}
|
||
|
||
/* Clear out all parts of the state in F that can safely be discarded
|
||
after the function has been compiled, to let garbage collection
|
||
reclaim the memory. */
|
||
|
||
void
|
||
free_after_compilation (struct function *f)
|
||
{
|
||
VEC_free (int, heap, prologue);
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VEC_free (int, heap, epilogue);
|
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VEC_free (int, heap, sibcall_epilogue);
|
||
|
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f->eh = NULL;
|
||
f->expr = NULL;
|
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f->emit = NULL;
|
||
f->varasm = NULL;
|
||
f->machine = NULL;
|
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f->cfg = NULL;
|
||
|
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f->x_avail_temp_slots = NULL;
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f->x_used_temp_slots = NULL;
|
||
f->arg_offset_rtx = NULL;
|
||
f->return_rtx = NULL;
|
||
f->internal_arg_pointer = NULL;
|
||
f->x_nonlocal_goto_handler_labels = NULL;
|
||
f->x_return_label = NULL;
|
||
f->x_naked_return_label = NULL;
|
||
f->x_stack_slot_list = NULL;
|
||
f->x_stack_check_probe_note = NULL;
|
||
f->x_arg_pointer_save_area = NULL;
|
||
f->x_parm_birth_insn = NULL;
|
||
f->epilogue_delay_list = NULL;
|
||
}
|
||
|
||
/* Allocate fixed slots in the stack frame of the current function. */
|
||
|
||
/* Return size needed for stack frame based on slots so far allocated in
|
||
function F.
|
||
This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY;
|
||
the caller may have to do that. */
|
||
|
||
static HOST_WIDE_INT
|
||
get_func_frame_size (struct function *f)
|
||
{
|
||
if (FRAME_GROWS_DOWNWARD)
|
||
return -f->x_frame_offset;
|
||
else
|
||
return f->x_frame_offset;
|
||
}
|
||
|
||
/* Return size needed for stack frame based on slots so far allocated.
|
||
This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY;
|
||
the caller may have to do that. */
|
||
|
||
HOST_WIDE_INT
|
||
get_frame_size (void)
|
||
{
|
||
return get_func_frame_size (cfun);
|
||
}
|
||
|
||
/* Issue an error message and return TRUE if frame OFFSET overflows in
|
||
the signed target pointer arithmetics for function FUNC. Otherwise
|
||
return FALSE. */
|
||
|
||
bool
|
||
frame_offset_overflow (HOST_WIDE_INT offset, tree func)
|
||
{
|
||
unsigned HOST_WIDE_INT size = FRAME_GROWS_DOWNWARD ? -offset : offset;
|
||
|
||
if (size > ((unsigned HOST_WIDE_INT) 1 << (GET_MODE_BITSIZE (Pmode) - 1))
|
||
/* Leave room for the fixed part of the frame. */
|
||
- 64 * UNITS_PER_WORD)
|
||
{
|
||
error ("%Jtotal size of local objects too large", func);
|
||
return TRUE;
|
||
}
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Allocate a stack slot of SIZE bytes and return a MEM rtx for it
|
||
with machine mode MODE.
|
||
|
||
ALIGN controls the amount of alignment for the address of the slot:
|
||
0 means according to MODE,
|
||
-1 means use BIGGEST_ALIGNMENT and round size to multiple of that,
|
||
-2 means use BITS_PER_UNIT,
|
||
positive specifies alignment boundary in bits.
|
||
|
||
We do not round to stack_boundary here.
|
||
|
||
FUNCTION specifies the function to allocate in. */
|
||
|
||
static rtx
|
||
assign_stack_local_1 (enum machine_mode mode, HOST_WIDE_INT size, int align,
|
||
struct function *function)
|
||
{
|
||
rtx x, addr;
|
||
int bigend_correction = 0;
|
||
unsigned int alignment;
|
||
int frame_off, frame_alignment, frame_phase;
|
||
|
||
if (align == 0)
|
||
{
|
||
tree type;
|
||
|
||
if (mode == BLKmode)
|
||
alignment = BIGGEST_ALIGNMENT;
|
||
else
|
||
alignment = GET_MODE_ALIGNMENT (mode);
|
||
|
||
/* Allow the target to (possibly) increase the alignment of this
|
||
stack slot. */
|
||
type = lang_hooks.types.type_for_mode (mode, 0);
|
||
if (type)
|
||
alignment = LOCAL_ALIGNMENT (type, alignment);
|
||
|
||
alignment /= BITS_PER_UNIT;
|
||
}
|
||
else if (align == -1)
|
||
{
|
||
alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT;
|
||
size = CEIL_ROUND (size, alignment);
|
||
}
|
||
else if (align == -2)
|
||
alignment = 1; /* BITS_PER_UNIT / BITS_PER_UNIT */
|
||
else
|
||
alignment = align / BITS_PER_UNIT;
|
||
|
||
if (FRAME_GROWS_DOWNWARD)
|
||
function->x_frame_offset -= size;
|
||
|
||
/* Ignore alignment we can't do with expected alignment of the boundary. */
|
||
if (alignment * BITS_PER_UNIT > PREFERRED_STACK_BOUNDARY)
|
||
alignment = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;
|
||
|
||
if (function->stack_alignment_needed < alignment * BITS_PER_UNIT)
|
||
function->stack_alignment_needed = alignment * BITS_PER_UNIT;
|
||
|
||
/* Calculate how many bytes the start of local variables is off from
|
||
stack alignment. */
|
||
frame_alignment = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;
|
||
frame_off = STARTING_FRAME_OFFSET % frame_alignment;
|
||
frame_phase = frame_off ? frame_alignment - frame_off : 0;
|
||
|
||
/* Round the frame offset to the specified alignment. The default is
|
||
to always honor requests to align the stack but a port may choose to
|
||
do its own stack alignment by defining STACK_ALIGNMENT_NEEDED. */
|
||
if (STACK_ALIGNMENT_NEEDED
|
||
|| mode != BLKmode
|
||
|| size != 0)
|
||
{
|
||
/* We must be careful here, since FRAME_OFFSET might be negative and
|
||
division with a negative dividend isn't as well defined as we might
|
||
like. So we instead assume that ALIGNMENT is a power of two and
|
||
use logical operations which are unambiguous. */
|
||
if (FRAME_GROWS_DOWNWARD)
|
||
function->x_frame_offset
|
||
= (FLOOR_ROUND (function->x_frame_offset - frame_phase,
|
||
(unsigned HOST_WIDE_INT) alignment)
|
||
+ frame_phase);
|
||
else
|
||
function->x_frame_offset
|
||
= (CEIL_ROUND (function->x_frame_offset - frame_phase,
|
||
(unsigned HOST_WIDE_INT) alignment)
|
||
+ frame_phase);
|
||
}
|
||
|
||
/* On a big-endian machine, if we are allocating more space than we will use,
|
||
use the least significant bytes of those that are allocated. */
|
||
if (BYTES_BIG_ENDIAN && mode != BLKmode && GET_MODE_SIZE (mode) < size)
|
||
bigend_correction = size - GET_MODE_SIZE (mode);
|
||
|
||
/* If we have already instantiated virtual registers, return the actual
|
||
address relative to the frame pointer. */
|
||
if (function == cfun && virtuals_instantiated)
|
||
addr = plus_constant (frame_pointer_rtx,
|
||
trunc_int_for_mode
|
||
(frame_offset + bigend_correction
|
||
+ STARTING_FRAME_OFFSET, Pmode));
|
||
else
|
||
addr = plus_constant (virtual_stack_vars_rtx,
|
||
trunc_int_for_mode
|
||
(function->x_frame_offset + bigend_correction,
|
||
Pmode));
|
||
|
||
if (!FRAME_GROWS_DOWNWARD)
|
||
function->x_frame_offset += size;
|
||
|
||
x = gen_rtx_MEM (mode, addr);
|
||
MEM_NOTRAP_P (x) = 1;
|
||
|
||
function->x_stack_slot_list
|
||
= gen_rtx_EXPR_LIST (VOIDmode, x, function->x_stack_slot_list);
|
||
|
||
if (frame_offset_overflow (function->x_frame_offset, function->decl))
|
||
function->x_frame_offset = 0;
|
||
|
||
return x;
|
||
}
|
||
|
||
/* Wrapper around assign_stack_local_1; assign a local stack slot for the
|
||
current function. */
|
||
|
||
rtx
|
||
assign_stack_local (enum machine_mode mode, HOST_WIDE_INT size, int align)
|
||
{
|
||
return assign_stack_local_1 (mode, size, align, cfun);
|
||
}
|
||
|
||
|
||
/* Removes temporary slot TEMP from LIST. */
|
||
|
||
static void
|
||
cut_slot_from_list (struct temp_slot *temp, struct temp_slot **list)
|
||
{
|
||
if (temp->next)
|
||
temp->next->prev = temp->prev;
|
||
if (temp->prev)
|
||
temp->prev->next = temp->next;
|
||
else
|
||
*list = temp->next;
|
||
|
||
temp->prev = temp->next = NULL;
|
||
}
|
||
|
||
/* Inserts temporary slot TEMP to LIST. */
|
||
|
||
static void
|
||
insert_slot_to_list (struct temp_slot *temp, struct temp_slot **list)
|
||
{
|
||
temp->next = *list;
|
||
if (*list)
|
||
(*list)->prev = temp;
|
||
temp->prev = NULL;
|
||
*list = temp;
|
||
}
|
||
|
||
/* Returns the list of used temp slots at LEVEL. */
|
||
|
||
static struct temp_slot **
|
||
temp_slots_at_level (int level)
|
||
{
|
||
if (level >= (int) VEC_length (temp_slot_p, used_temp_slots))
|
||
{
|
||
size_t old_length = VEC_length (temp_slot_p, used_temp_slots);
|
||
temp_slot_p *p;
|
||
|
||
VEC_safe_grow (temp_slot_p, gc, used_temp_slots, level + 1);
|
||
p = VEC_address (temp_slot_p, used_temp_slots);
|
||
memset (&p[old_length], 0,
|
||
sizeof (temp_slot_p) * (level + 1 - old_length));
|
||
}
|
||
|
||
return &(VEC_address (temp_slot_p, used_temp_slots)[level]);
|
||
}
|
||
|
||
/* Returns the maximal temporary slot level. */
|
||
|
||
static int
|
||
max_slot_level (void)
|
||
{
|
||
if (!used_temp_slots)
|
||
return -1;
|
||
|
||
return VEC_length (temp_slot_p, used_temp_slots) - 1;
|
||
}
|
||
|
||
/* Moves temporary slot TEMP to LEVEL. */
|
||
|
||
static void
|
||
move_slot_to_level (struct temp_slot *temp, int level)
|
||
{
|
||
cut_slot_from_list (temp, temp_slots_at_level (temp->level));
|
||
insert_slot_to_list (temp, temp_slots_at_level (level));
|
||
temp->level = level;
|
||
}
|
||
|
||
/* Make temporary slot TEMP available. */
|
||
|
||
static void
|
||
make_slot_available (struct temp_slot *temp)
|
||
{
|
||
cut_slot_from_list (temp, temp_slots_at_level (temp->level));
|
||
insert_slot_to_list (temp, &avail_temp_slots);
|
||
temp->in_use = 0;
|
||
temp->level = -1;
|
||
}
|
||
|
||
/* Allocate a temporary stack slot and record it for possible later
|
||
reuse.
|
||
|
||
MODE is the machine mode to be given to the returned rtx.
|
||
|
||
SIZE is the size in units of the space required. We do no rounding here
|
||
since assign_stack_local will do any required rounding.
|
||
|
||
KEEP is 1 if this slot is to be retained after a call to
|
||
free_temp_slots. Automatic variables for a block are allocated
|
||
with this flag. KEEP values of 2 or 3 were needed respectively
|
||
for variables whose lifetime is controlled by CLEANUP_POINT_EXPRs
|
||
or for SAVE_EXPRs, but they are now unused.
|
||
|
||
TYPE is the type that will be used for the stack slot. */
|
||
|
||
rtx
|
||
assign_stack_temp_for_type (enum machine_mode mode, HOST_WIDE_INT size,
|
||
int keep, tree type)
|
||
{
|
||
unsigned int align;
|
||
struct temp_slot *p, *best_p = 0, *selected = NULL, **pp;
|
||
rtx slot;
|
||
|
||
/* If SIZE is -1 it means that somebody tried to allocate a temporary
|
||
of a variable size. */
|
||
gcc_assert (size != -1);
|
||
|
||
/* These are now unused. */
|
||
gcc_assert (keep <= 1);
|
||
|
||
if (mode == BLKmode)
|
||
align = BIGGEST_ALIGNMENT;
|
||
else
|
||
align = GET_MODE_ALIGNMENT (mode);
|
||
|
||
if (! type)
|
||
type = lang_hooks.types.type_for_mode (mode, 0);
|
||
|
||
if (type)
|
||
align = LOCAL_ALIGNMENT (type, align);
|
||
|
||
/* Try to find an available, already-allocated temporary of the proper
|
||
mode which meets the size and alignment requirements. Choose the
|
||
smallest one with the closest alignment.
|
||
|
||
If assign_stack_temp is called outside of the tree->rtl expansion,
|
||
we cannot reuse the stack slots (that may still refer to
|
||
VIRTUAL_STACK_VARS_REGNUM). */
|
||
if (!virtuals_instantiated)
|
||
{
|
||
for (p = avail_temp_slots; p; p = p->next)
|
||
{
|
||
if (p->align >= align && p->size >= size
|
||
&& GET_MODE (p->slot) == mode
|
||
&& objects_must_conflict_p (p->type, type)
|
||
&& (best_p == 0 || best_p->size > p->size
|
||
|| (best_p->size == p->size && best_p->align > p->align)))
|
||
{
|
||
if (p->align == align && p->size == size)
|
||
{
|
||
selected = p;
|
||
cut_slot_from_list (selected, &avail_temp_slots);
|
||
best_p = 0;
|
||
break;
|
||
}
|
||
best_p = p;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Make our best, if any, the one to use. */
|
||
if (best_p)
|
||
{
|
||
selected = best_p;
|
||
cut_slot_from_list (selected, &avail_temp_slots);
|
||
|
||
/* If there are enough aligned bytes left over, make them into a new
|
||
temp_slot so that the extra bytes don't get wasted. Do this only
|
||
for BLKmode slots, so that we can be sure of the alignment. */
|
||
if (GET_MODE (best_p->slot) == BLKmode)
|
||
{
|
||
int alignment = best_p->align / BITS_PER_UNIT;
|
||
HOST_WIDE_INT rounded_size = CEIL_ROUND (size, alignment);
|
||
|
||
if (best_p->size - rounded_size >= alignment)
|
||
{
|
||
p = ggc_alloc (sizeof (struct temp_slot));
|
||
p->in_use = p->addr_taken = 0;
|
||
p->size = best_p->size - rounded_size;
|
||
p->base_offset = best_p->base_offset + rounded_size;
|
||
p->full_size = best_p->full_size - rounded_size;
|
||
p->slot = adjust_address_nv (best_p->slot, BLKmode, rounded_size);
|
||
p->align = best_p->align;
|
||
p->address = 0;
|
||
p->type = best_p->type;
|
||
insert_slot_to_list (p, &avail_temp_slots);
|
||
|
||
stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, p->slot,
|
||
stack_slot_list);
|
||
|
||
best_p->size = rounded_size;
|
||
best_p->full_size = rounded_size;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If we still didn't find one, make a new temporary. */
|
||
if (selected == 0)
|
||
{
|
||
HOST_WIDE_INT frame_offset_old = frame_offset;
|
||
|
||
p = ggc_alloc (sizeof (struct temp_slot));
|
||
|
||
/* We are passing an explicit alignment request to assign_stack_local.
|
||
One side effect of that is assign_stack_local will not round SIZE
|
||
to ensure the frame offset remains suitably aligned.
|
||
|
||
So for requests which depended on the rounding of SIZE, we go ahead
|
||
and round it now. We also make sure ALIGNMENT is at least
|
||
BIGGEST_ALIGNMENT. */
|
||
gcc_assert (mode != BLKmode || align == BIGGEST_ALIGNMENT);
|
||
p->slot = assign_stack_local (mode,
|
||
(mode == BLKmode
|
||
? CEIL_ROUND (size, (int) align / BITS_PER_UNIT)
|
||
: size),
|
||
align);
|
||
|
||
p->align = align;
|
||
|
||
/* The following slot size computation is necessary because we don't
|
||
know the actual size of the temporary slot until assign_stack_local
|
||
has performed all the frame alignment and size rounding for the
|
||
requested temporary. Note that extra space added for alignment
|
||
can be either above or below this stack slot depending on which
|
||
way the frame grows. We include the extra space if and only if it
|
||
is above this slot. */
|
||
if (FRAME_GROWS_DOWNWARD)
|
||
p->size = frame_offset_old - frame_offset;
|
||
else
|
||
p->size = size;
|
||
|
||
/* Now define the fields used by combine_temp_slots. */
|
||
if (FRAME_GROWS_DOWNWARD)
|
||
{
|
||
p->base_offset = frame_offset;
|
||
p->full_size = frame_offset_old - frame_offset;
|
||
}
|
||
else
|
||
{
|
||
p->base_offset = frame_offset_old;
|
||
p->full_size = frame_offset - frame_offset_old;
|
||
}
|
||
p->address = 0;
|
||
|
||
selected = p;
|
||
}
|
||
|
||
p = selected;
|
||
p->in_use = 1;
|
||
p->addr_taken = 0;
|
||
p->type = type;
|
||
p->level = temp_slot_level;
|
||
p->keep = keep;
|
||
|
||
pp = temp_slots_at_level (p->level);
|
||
insert_slot_to_list (p, pp);
|
||
|
||
/* Create a new MEM rtx to avoid clobbering MEM flags of old slots. */
|
||
slot = gen_rtx_MEM (mode, XEXP (p->slot, 0));
|
||
stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, slot, stack_slot_list);
|
||
|
||
/* If we know the alias set for the memory that will be used, use
|
||
it. If there's no TYPE, then we don't know anything about the
|
||
alias set for the memory. */
|
||
set_mem_alias_set (slot, type ? get_alias_set (type) : 0);
|
||
set_mem_align (slot, align);
|
||
|
||
/* If a type is specified, set the relevant flags. */
|
||
if (type != 0)
|
||
{
|
||
MEM_VOLATILE_P (slot) = TYPE_VOLATILE (type);
|
||
MEM_SET_IN_STRUCT_P (slot, AGGREGATE_TYPE_P (type));
|
||
}
|
||
MEM_NOTRAP_P (slot) = 1;
|
||
|
||
return slot;
|
||
}
|
||
|
||
/* Allocate a temporary stack slot and record it for possible later
|
||
reuse. First three arguments are same as in preceding function. */
|
||
|
||
rtx
|
||
assign_stack_temp (enum machine_mode mode, HOST_WIDE_INT size, int keep)
|
||
{
|
||
return assign_stack_temp_for_type (mode, size, keep, NULL_TREE);
|
||
}
|
||
|
||
/* Assign a temporary.
|
||
If TYPE_OR_DECL is a decl, then we are doing it on behalf of the decl
|
||
and so that should be used in error messages. In either case, we
|
||
allocate of the given type.
|
||
KEEP is as for assign_stack_temp.
|
||
MEMORY_REQUIRED is 1 if the result must be addressable stack memory;
|
||
it is 0 if a register is OK.
|
||
DONT_PROMOTE is 1 if we should not promote values in register
|
||
to wider modes. */
|
||
|
||
rtx
|
||
assign_temp (tree type_or_decl, int keep, int memory_required,
|
||
int dont_promote ATTRIBUTE_UNUSED)
|
||
{
|
||
tree type, decl;
|
||
enum machine_mode mode;
|
||
#ifdef PROMOTE_MODE
|
||
int unsignedp;
|
||
#endif
|
||
|
||
if (DECL_P (type_or_decl))
|
||
decl = type_or_decl, type = TREE_TYPE (decl);
|
||
else
|
||
decl = NULL, type = type_or_decl;
|
||
|
||
mode = TYPE_MODE (type);
|
||
#ifdef PROMOTE_MODE
|
||
unsignedp = TYPE_UNSIGNED (type);
|
||
#endif
|
||
|
||
if (mode == BLKmode || memory_required)
|
||
{
|
||
HOST_WIDE_INT size = int_size_in_bytes (type);
|
||
rtx tmp;
|
||
|
||
/* Zero sized arrays are GNU C extension. Set size to 1 to avoid
|
||
problems with allocating the stack space. */
|
||
if (size == 0)
|
||
size = 1;
|
||
|
||
/* Unfortunately, we don't yet know how to allocate variable-sized
|
||
temporaries. However, sometimes we can find a fixed upper limit on
|
||
the size, so try that instead. */
|
||
else if (size == -1)
|
||
size = max_int_size_in_bytes (type);
|
||
|
||
/* The size of the temporary may be too large to fit into an integer. */
|
||
/* ??? Not sure this should happen except for user silliness, so limit
|
||
this to things that aren't compiler-generated temporaries. The
|
||
rest of the time we'll die in assign_stack_temp_for_type. */
|
||
if (decl && size == -1
|
||
&& TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST)
|
||
{
|
||
error ("size of variable %q+D is too large", decl);
|
||
size = 1;
|
||
}
|
||
|
||
tmp = assign_stack_temp_for_type (mode, size, keep, type);
|
||
return tmp;
|
||
}
|
||
|
||
#ifdef PROMOTE_MODE
|
||
if (! dont_promote)
|
||
mode = promote_mode (type, mode, &unsignedp, 0);
|
||
#endif
|
||
|
||
return gen_reg_rtx (mode);
|
||
}
|
||
|
||
/* Combine temporary stack slots which are adjacent on the stack.
|
||
|
||
This allows for better use of already allocated stack space. This is only
|
||
done for BLKmode slots because we can be sure that we won't have alignment
|
||
problems in this case. */
|
||
|
||
static void
|
||
combine_temp_slots (void)
|
||
{
|
||
struct temp_slot *p, *q, *next, *next_q;
|
||
int num_slots;
|
||
|
||
/* We can't combine slots, because the information about which slot
|
||
is in which alias set will be lost. */
|
||
if (flag_strict_aliasing)
|
||
return;
|
||
|
||
/* If there are a lot of temp slots, don't do anything unless
|
||
high levels of optimization. */
|
||
if (! flag_expensive_optimizations)
|
||
for (p = avail_temp_slots, num_slots = 0; p; p = p->next, num_slots++)
|
||
if (num_slots > 100 || (num_slots > 10 && optimize == 0))
|
||
return;
|
||
|
||
for (p = avail_temp_slots; p; p = next)
|
||
{
|
||
int delete_p = 0;
|
||
|
||
next = p->next;
|
||
|
||
if (GET_MODE (p->slot) != BLKmode)
|
||
continue;
|
||
|
||
for (q = p->next; q; q = next_q)
|
||
{
|
||
int delete_q = 0;
|
||
|
||
next_q = q->next;
|
||
|
||
if (GET_MODE (q->slot) != BLKmode)
|
||
continue;
|
||
|
||
if (p->base_offset + p->full_size == q->base_offset)
|
||
{
|
||
/* Q comes after P; combine Q into P. */
|
||
p->size += q->size;
|
||
p->full_size += q->full_size;
|
||
delete_q = 1;
|
||
}
|
||
else if (q->base_offset + q->full_size == p->base_offset)
|
||
{
|
||
/* P comes after Q; combine P into Q. */
|
||
q->size += p->size;
|
||
q->full_size += p->full_size;
|
||
delete_p = 1;
|
||
break;
|
||
}
|
||
if (delete_q)
|
||
cut_slot_from_list (q, &avail_temp_slots);
|
||
}
|
||
|
||
/* Either delete P or advance past it. */
|
||
if (delete_p)
|
||
cut_slot_from_list (p, &avail_temp_slots);
|
||
}
|
||
}
|
||
|
||
/* Find the temp slot corresponding to the object at address X. */
|
||
|
||
static struct temp_slot *
|
||
find_temp_slot_from_address (rtx x)
|
||
{
|
||
struct temp_slot *p;
|
||
rtx next;
|
||
int i;
|
||
|
||
for (i = max_slot_level (); i >= 0; i--)
|
||
for (p = *temp_slots_at_level (i); p; p = p->next)
|
||
{
|
||
if (XEXP (p->slot, 0) == x
|
||
|| p->address == x
|
||
|| (GET_CODE (x) == PLUS
|
||
&& XEXP (x, 0) == virtual_stack_vars_rtx
|
||
&& GET_CODE (XEXP (x, 1)) == CONST_INT
|
||
&& INTVAL (XEXP (x, 1)) >= p->base_offset
|
||
&& INTVAL (XEXP (x, 1)) < p->base_offset + p->full_size))
|
||
return p;
|
||
|
||
else if (p->address != 0 && GET_CODE (p->address) == EXPR_LIST)
|
||
for (next = p->address; next; next = XEXP (next, 1))
|
||
if (XEXP (next, 0) == x)
|
||
return p;
|
||
}
|
||
|
||
/* If we have a sum involving a register, see if it points to a temp
|
||
slot. */
|
||
if (GET_CODE (x) == PLUS && REG_P (XEXP (x, 0))
|
||
&& (p = find_temp_slot_from_address (XEXP (x, 0))) != 0)
|
||
return p;
|
||
else if (GET_CODE (x) == PLUS && REG_P (XEXP (x, 1))
|
||
&& (p = find_temp_slot_from_address (XEXP (x, 1))) != 0)
|
||
return p;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Indicate that NEW is an alternate way of referring to the temp slot
|
||
that previously was known by OLD. */
|
||
|
||
void
|
||
update_temp_slot_address (rtx old, rtx new)
|
||
{
|
||
struct temp_slot *p;
|
||
|
||
if (rtx_equal_p (old, new))
|
||
return;
|
||
|
||
p = find_temp_slot_from_address (old);
|
||
|
||
/* If we didn't find one, see if both OLD is a PLUS. If so, and NEW
|
||
is a register, see if one operand of the PLUS is a temporary
|
||
location. If so, NEW points into it. Otherwise, if both OLD and
|
||
NEW are a PLUS and if there is a register in common between them.
|
||
If so, try a recursive call on those values. */
|
||
if (p == 0)
|
||
{
|
||
if (GET_CODE (old) != PLUS)
|
||
return;
|
||
|
||
if (REG_P (new))
|
||
{
|
||
update_temp_slot_address (XEXP (old, 0), new);
|
||
update_temp_slot_address (XEXP (old, 1), new);
|
||
return;
|
||
}
|
||
else if (GET_CODE (new) != PLUS)
|
||
return;
|
||
|
||
if (rtx_equal_p (XEXP (old, 0), XEXP (new, 0)))
|
||
update_temp_slot_address (XEXP (old, 1), XEXP (new, 1));
|
||
else if (rtx_equal_p (XEXP (old, 1), XEXP (new, 0)))
|
||
update_temp_slot_address (XEXP (old, 0), XEXP (new, 1));
|
||
else if (rtx_equal_p (XEXP (old, 0), XEXP (new, 1)))
|
||
update_temp_slot_address (XEXP (old, 1), XEXP (new, 0));
|
||
else if (rtx_equal_p (XEXP (old, 1), XEXP (new, 1)))
|
||
update_temp_slot_address (XEXP (old, 0), XEXP (new, 0));
|
||
|
||
return;
|
||
}
|
||
|
||
/* Otherwise add an alias for the temp's address. */
|
||
else if (p->address == 0)
|
||
p->address = new;
|
||
else
|
||
{
|
||
if (GET_CODE (p->address) != EXPR_LIST)
|
||
p->address = gen_rtx_EXPR_LIST (VOIDmode, p->address, NULL_RTX);
|
||
|
||
p->address = gen_rtx_EXPR_LIST (VOIDmode, new, p->address);
|
||
}
|
||
}
|
||
|
||
/* If X could be a reference to a temporary slot, mark the fact that its
|
||
address was taken. */
|
||
|
||
void
|
||
mark_temp_addr_taken (rtx x)
|
||
{
|
||
struct temp_slot *p;
|
||
|
||
if (x == 0)
|
||
return;
|
||
|
||
/* If X is not in memory or is at a constant address, it cannot be in
|
||
a temporary slot. */
|
||
if (!MEM_P (x) || CONSTANT_P (XEXP (x, 0)))
|
||
return;
|
||
|
||
p = find_temp_slot_from_address (XEXP (x, 0));
|
||
if (p != 0)
|
||
p->addr_taken = 1;
|
||
}
|
||
|
||
/* If X could be a reference to a temporary slot, mark that slot as
|
||
belonging to the to one level higher than the current level. If X
|
||
matched one of our slots, just mark that one. Otherwise, we can't
|
||
easily predict which it is, so upgrade all of them. Kept slots
|
||
need not be touched.
|
||
|
||
This is called when an ({...}) construct occurs and a statement
|
||
returns a value in memory. */
|
||
|
||
void
|
||
preserve_temp_slots (rtx x)
|
||
{
|
||
struct temp_slot *p = 0, *next;
|
||
|
||
/* If there is no result, we still might have some objects whose address
|
||
were taken, so we need to make sure they stay around. */
|
||
if (x == 0)
|
||
{
|
||
for (p = *temp_slots_at_level (temp_slot_level); p; p = next)
|
||
{
|
||
next = p->next;
|
||
|
||
if (p->addr_taken)
|
||
move_slot_to_level (p, temp_slot_level - 1);
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
/* If X is a register that is being used as a pointer, see if we have
|
||
a temporary slot we know it points to. To be consistent with
|
||
the code below, we really should preserve all non-kept slots
|
||
if we can't find a match, but that seems to be much too costly. */
|
||
if (REG_P (x) && REG_POINTER (x))
|
||
p = find_temp_slot_from_address (x);
|
||
|
||
/* If X is not in memory or is at a constant address, it cannot be in
|
||
a temporary slot, but it can contain something whose address was
|
||
taken. */
|
||
if (p == 0 && (!MEM_P (x) || CONSTANT_P (XEXP (x, 0))))
|
||
{
|
||
for (p = *temp_slots_at_level (temp_slot_level); p; p = next)
|
||
{
|
||
next = p->next;
|
||
|
||
if (p->addr_taken)
|
||
move_slot_to_level (p, temp_slot_level - 1);
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
/* First see if we can find a match. */
|
||
if (p == 0)
|
||
p = find_temp_slot_from_address (XEXP (x, 0));
|
||
|
||
if (p != 0)
|
||
{
|
||
/* Move everything at our level whose address was taken to our new
|
||
level in case we used its address. */
|
||
struct temp_slot *q;
|
||
|
||
if (p->level == temp_slot_level)
|
||
{
|
||
for (q = *temp_slots_at_level (temp_slot_level); q; q = next)
|
||
{
|
||
next = q->next;
|
||
|
||
if (p != q && q->addr_taken)
|
||
move_slot_to_level (q, temp_slot_level - 1);
|
||
}
|
||
|
||
move_slot_to_level (p, temp_slot_level - 1);
|
||
p->addr_taken = 0;
|
||
}
|
||
return;
|
||
}
|
||
|
||
/* Otherwise, preserve all non-kept slots at this level. */
|
||
for (p = *temp_slots_at_level (temp_slot_level); p; p = next)
|
||
{
|
||
next = p->next;
|
||
|
||
if (!p->keep)
|
||
move_slot_to_level (p, temp_slot_level - 1);
|
||
}
|
||
}
|
||
|
||
/* Free all temporaries used so far. This is normally called at the
|
||
end of generating code for a statement. */
|
||
|
||
void
|
||
free_temp_slots (void)
|
||
{
|
||
struct temp_slot *p, *next;
|
||
|
||
for (p = *temp_slots_at_level (temp_slot_level); p; p = next)
|
||
{
|
||
next = p->next;
|
||
|
||
if (!p->keep)
|
||
make_slot_available (p);
|
||
}
|
||
|
||
combine_temp_slots ();
|
||
}
|
||
|
||
/* Push deeper into the nesting level for stack temporaries. */
|
||
|
||
void
|
||
push_temp_slots (void)
|
||
{
|
||
temp_slot_level++;
|
||
}
|
||
|
||
/* Pop a temporary nesting level. All slots in use in the current level
|
||
are freed. */
|
||
|
||
void
|
||
pop_temp_slots (void)
|
||
{
|
||
struct temp_slot *p, *next;
|
||
|
||
for (p = *temp_slots_at_level (temp_slot_level); p; p = next)
|
||
{
|
||
next = p->next;
|
||
make_slot_available (p);
|
||
}
|
||
|
||
combine_temp_slots ();
|
||
|
||
temp_slot_level--;
|
||
}
|
||
|
||
/* Initialize temporary slots. */
|
||
|
||
void
|
||
init_temp_slots (void)
|
||
{
|
||
/* We have not allocated any temporaries yet. */
|
||
avail_temp_slots = 0;
|
||
used_temp_slots = 0;
|
||
temp_slot_level = 0;
|
||
}
|
||
|
||
/* These routines are responsible for converting virtual register references
|
||
to the actual hard register references once RTL generation is complete.
|
||
|
||
The following four variables are used for communication between the
|
||
routines. They contain the offsets of the virtual registers from their
|
||
respective hard registers. */
|
||
|
||
static int in_arg_offset;
|
||
static int var_offset;
|
||
static int dynamic_offset;
|
||
static int out_arg_offset;
|
||
static int cfa_offset;
|
||
|
||
/* In most machines, the stack pointer register is equivalent to the bottom
|
||
of the stack. */
|
||
|
||
#ifndef STACK_POINTER_OFFSET
|
||
#define STACK_POINTER_OFFSET 0
|
||
#endif
|
||
|
||
/* If not defined, pick an appropriate default for the offset of dynamically
|
||
allocated memory depending on the value of ACCUMULATE_OUTGOING_ARGS,
|
||
REG_PARM_STACK_SPACE, and OUTGOING_REG_PARM_STACK_SPACE. */
|
||
|
||
#ifndef STACK_DYNAMIC_OFFSET
|
||
|
||
/* The bottom of the stack points to the actual arguments. If
|
||
REG_PARM_STACK_SPACE is defined, this includes the space for the register
|
||
parameters. However, if OUTGOING_REG_PARM_STACK space is not defined,
|
||
stack space for register parameters is not pushed by the caller, but
|
||
rather part of the fixed stack areas and hence not included in
|
||
`current_function_outgoing_args_size'. Nevertheless, we must allow
|
||
for it when allocating stack dynamic objects. */
|
||
|
||
#if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
|
||
#define STACK_DYNAMIC_OFFSET(FNDECL) \
|
||
((ACCUMULATE_OUTGOING_ARGS \
|
||
? (current_function_outgoing_args_size + REG_PARM_STACK_SPACE (FNDECL)) : 0)\
|
||
+ (STACK_POINTER_OFFSET)) \
|
||
|
||
#else
|
||
#define STACK_DYNAMIC_OFFSET(FNDECL) \
|
||
((ACCUMULATE_OUTGOING_ARGS ? current_function_outgoing_args_size : 0) \
|
||
+ (STACK_POINTER_OFFSET))
|
||
#endif
|
||
#endif
|
||
|
||
|
||
/* Given a piece of RTX and a pointer to a HOST_WIDE_INT, if the RTX
|
||
is a virtual register, return the equivalent hard register and set the
|
||
offset indirectly through the pointer. Otherwise, return 0. */
|
||
|
||
static rtx
|
||
instantiate_new_reg (rtx x, HOST_WIDE_INT *poffset)
|
||
{
|
||
rtx new;
|
||
HOST_WIDE_INT offset;
|
||
|
||
if (x == virtual_incoming_args_rtx)
|
||
new = arg_pointer_rtx, offset = in_arg_offset;
|
||
else if (x == virtual_stack_vars_rtx)
|
||
new = frame_pointer_rtx, offset = var_offset;
|
||
else if (x == virtual_stack_dynamic_rtx)
|
||
new = stack_pointer_rtx, offset = dynamic_offset;
|
||
else if (x == virtual_outgoing_args_rtx)
|
||
new = stack_pointer_rtx, offset = out_arg_offset;
|
||
else if (x == virtual_cfa_rtx)
|
||
{
|
||
#ifdef FRAME_POINTER_CFA_OFFSET
|
||
new = frame_pointer_rtx;
|
||
#else
|
||
new = arg_pointer_rtx;
|
||
#endif
|
||
offset = cfa_offset;
|
||
}
|
||
else
|
||
return NULL_RTX;
|
||
|
||
*poffset = offset;
|
||
return new;
|
||
}
|
||
|
||
/* A subroutine of instantiate_virtual_regs, called via for_each_rtx.
|
||
Instantiate any virtual registers present inside of *LOC. The expression
|
||
is simplified, as much as possible, but is not to be considered "valid"
|
||
in any sense implied by the target. If any change is made, set CHANGED
|
||
to true. */
|
||
|
||
static int
|
||
instantiate_virtual_regs_in_rtx (rtx *loc, void *data)
|
||
{
|
||
HOST_WIDE_INT offset;
|
||
bool *changed = (bool *) data;
|
||
rtx x, new;
|
||
|
||
x = *loc;
|
||
if (x == 0)
|
||
return 0;
|
||
|
||
switch (GET_CODE (x))
|
||
{
|
||
case REG:
|
||
new = instantiate_new_reg (x, &offset);
|
||
if (new)
|
||
{
|
||
*loc = plus_constant (new, offset);
|
||
if (changed)
|
||
*changed = true;
|
||
}
|
||
return -1;
|
||
|
||
case PLUS:
|
||
new = instantiate_new_reg (XEXP (x, 0), &offset);
|
||
if (new)
|
||
{
|
||
new = plus_constant (new, offset);
|
||
*loc = simplify_gen_binary (PLUS, GET_MODE (x), new, XEXP (x, 1));
|
||
if (changed)
|
||
*changed = true;
|
||
return -1;
|
||
}
|
||
|
||
/* FIXME -- from old code */
|
||
/* If we have (plus (subreg (virtual-reg)) (const_int)), we know
|
||
we can commute the PLUS and SUBREG because pointers into the
|
||
frame are well-behaved. */
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* A subroutine of instantiate_virtual_regs_in_insn. Return true if X
|
||
matches the predicate for insn CODE operand OPERAND. */
|
||
|
||
static int
|
||
safe_insn_predicate (int code, int operand, rtx x)
|
||
{
|
||
const struct insn_operand_data *op_data;
|
||
|
||
if (code < 0)
|
||
return true;
|
||
|
||
op_data = &insn_data[code].operand[operand];
|
||
if (op_data->predicate == NULL)
|
||
return true;
|
||
|
||
return op_data->predicate (x, op_data->mode);
|
||
}
|
||
|
||
/* A subroutine of instantiate_virtual_regs. Instantiate any virtual
|
||
registers present inside of insn. The result will be a valid insn. */
|
||
|
||
static void
|
||
instantiate_virtual_regs_in_insn (rtx insn)
|
||
{
|
||
HOST_WIDE_INT offset;
|
||
int insn_code, i;
|
||
bool any_change = false;
|
||
rtx set, new, x, seq;
|
||
|
||
/* There are some special cases to be handled first. */
|
||
set = single_set (insn);
|
||
if (set)
|
||
{
|
||
/* We're allowed to assign to a virtual register. This is interpreted
|
||
to mean that the underlying register gets assigned the inverse
|
||
transformation. This is used, for example, in the handling of
|
||
non-local gotos. */
|
||
new = instantiate_new_reg (SET_DEST (set), &offset);
|
||
if (new)
|
||
{
|
||
start_sequence ();
|
||
|
||
for_each_rtx (&SET_SRC (set), instantiate_virtual_regs_in_rtx, NULL);
|
||
x = simplify_gen_binary (PLUS, GET_MODE (new), SET_SRC (set),
|
||
GEN_INT (-offset));
|
||
x = force_operand (x, new);
|
||
if (x != new)
|
||
emit_move_insn (new, x);
|
||
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
emit_insn_before (seq, insn);
|
||
delete_insn (insn);
|
||
return;
|
||
}
|
||
|
||
/* Handle a straight copy from a virtual register by generating a
|
||
new add insn. The difference between this and falling through
|
||
to the generic case is avoiding a new pseudo and eliminating a
|
||
move insn in the initial rtl stream. */
|
||
new = instantiate_new_reg (SET_SRC (set), &offset);
|
||
if (new && offset != 0
|
||
&& REG_P (SET_DEST (set))
|
||
&& REGNO (SET_DEST (set)) > LAST_VIRTUAL_REGISTER)
|
||
{
|
||
start_sequence ();
|
||
|
||
x = expand_simple_binop (GET_MODE (SET_DEST (set)), PLUS,
|
||
new, GEN_INT (offset), SET_DEST (set),
|
||
1, OPTAB_LIB_WIDEN);
|
||
if (x != SET_DEST (set))
|
||
emit_move_insn (SET_DEST (set), x);
|
||
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
emit_insn_before (seq, insn);
|
||
delete_insn (insn);
|
||
return;
|
||
}
|
||
|
||
extract_insn (insn);
|
||
insn_code = INSN_CODE (insn);
|
||
|
||
/* Handle a plus involving a virtual register by determining if the
|
||
operands remain valid if they're modified in place. */
|
||
if (GET_CODE (SET_SRC (set)) == PLUS
|
||
&& recog_data.n_operands >= 3
|
||
&& recog_data.operand_loc[1] == &XEXP (SET_SRC (set), 0)
|
||
&& recog_data.operand_loc[2] == &XEXP (SET_SRC (set), 1)
|
||
&& GET_CODE (recog_data.operand[2]) == CONST_INT
|
||
&& (new = instantiate_new_reg (recog_data.operand[1], &offset)))
|
||
{
|
||
offset += INTVAL (recog_data.operand[2]);
|
||
|
||
/* If the sum is zero, then replace with a plain move. */
|
||
if (offset == 0
|
||
&& REG_P (SET_DEST (set))
|
||
&& REGNO (SET_DEST (set)) > LAST_VIRTUAL_REGISTER)
|
||
{
|
||
start_sequence ();
|
||
emit_move_insn (SET_DEST (set), new);
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
emit_insn_before (seq, insn);
|
||
delete_insn (insn);
|
||
return;
|
||
}
|
||
|
||
x = gen_int_mode (offset, recog_data.operand_mode[2]);
|
||
|
||
/* Using validate_change and apply_change_group here leaves
|
||
recog_data in an invalid state. Since we know exactly what
|
||
we want to check, do those two by hand. */
|
||
if (safe_insn_predicate (insn_code, 1, new)
|
||
&& safe_insn_predicate (insn_code, 2, x))
|
||
{
|
||
*recog_data.operand_loc[1] = recog_data.operand[1] = new;
|
||
*recog_data.operand_loc[2] = recog_data.operand[2] = x;
|
||
any_change = true;
|
||
|
||
/* Fall through into the regular operand fixup loop in
|
||
order to take care of operands other than 1 and 2. */
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
extract_insn (insn);
|
||
insn_code = INSN_CODE (insn);
|
||
}
|
||
|
||
/* In the general case, we expect virtual registers to appear only in
|
||
operands, and then only as either bare registers or inside memories. */
|
||
for (i = 0; i < recog_data.n_operands; ++i)
|
||
{
|
||
x = recog_data.operand[i];
|
||
switch (GET_CODE (x))
|
||
{
|
||
case MEM:
|
||
{
|
||
rtx addr = XEXP (x, 0);
|
||
bool changed = false;
|
||
|
||
for_each_rtx (&addr, instantiate_virtual_regs_in_rtx, &changed);
|
||
if (!changed)
|
||
continue;
|
||
|
||
start_sequence ();
|
||
x = replace_equiv_address (x, addr);
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
if (seq)
|
||
emit_insn_before (seq, insn);
|
||
}
|
||
break;
|
||
|
||
case REG:
|
||
new = instantiate_new_reg (x, &offset);
|
||
if (new == NULL)
|
||
continue;
|
||
if (offset == 0)
|
||
x = new;
|
||
else
|
||
{
|
||
start_sequence ();
|
||
|
||
/* Careful, special mode predicates may have stuff in
|
||
insn_data[insn_code].operand[i].mode that isn't useful
|
||
to us for computing a new value. */
|
||
/* ??? Recognize address_operand and/or "p" constraints
|
||
to see if (plus new offset) is a valid before we put
|
||
this through expand_simple_binop. */
|
||
x = expand_simple_binop (GET_MODE (x), PLUS, new,
|
||
GEN_INT (offset), NULL_RTX,
|
||
1, OPTAB_LIB_WIDEN);
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
emit_insn_before (seq, insn);
|
||
}
|
||
break;
|
||
|
||
case SUBREG:
|
||
new = instantiate_new_reg (SUBREG_REG (x), &offset);
|
||
if (new == NULL)
|
||
continue;
|
||
if (offset != 0)
|
||
{
|
||
start_sequence ();
|
||
new = expand_simple_binop (GET_MODE (new), PLUS, new,
|
||
GEN_INT (offset), NULL_RTX,
|
||
1, OPTAB_LIB_WIDEN);
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
emit_insn_before (seq, insn);
|
||
}
|
||
x = simplify_gen_subreg (recog_data.operand_mode[i], new,
|
||
GET_MODE (new), SUBREG_BYTE (x));
|
||
break;
|
||
|
||
default:
|
||
continue;
|
||
}
|
||
|
||
/* At this point, X contains the new value for the operand.
|
||
Validate the new value vs the insn predicate. Note that
|
||
asm insns will have insn_code -1 here. */
|
||
if (!safe_insn_predicate (insn_code, i, x))
|
||
{
|
||
start_sequence ();
|
||
x = force_reg (insn_data[insn_code].operand[i].mode, x);
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
if (seq)
|
||
emit_insn_before (seq, insn);
|
||
}
|
||
|
||
*recog_data.operand_loc[i] = recog_data.operand[i] = x;
|
||
any_change = true;
|
||
}
|
||
|
||
if (any_change)
|
||
{
|
||
/* Propagate operand changes into the duplicates. */
|
||
for (i = 0; i < recog_data.n_dups; ++i)
|
||
*recog_data.dup_loc[i]
|
||
= recog_data.operand[(unsigned)recog_data.dup_num[i]];
|
||
|
||
/* Force re-recognition of the instruction for validation. */
|
||
INSN_CODE (insn) = -1;
|
||
}
|
||
|
||
if (asm_noperands (PATTERN (insn)) >= 0)
|
||
{
|
||
if (!check_asm_operands (PATTERN (insn)))
|
||
{
|
||
error_for_asm (insn, "impossible constraint in %<asm%>");
|
||
delete_insn (insn);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (recog_memoized (insn) < 0)
|
||
fatal_insn_not_found (insn);
|
||
}
|
||
}
|
||
|
||
/* Subroutine of instantiate_decls. Given RTL representing a decl,
|
||
do any instantiation required. */
|
||
|
||
static void
|
||
instantiate_decl (rtx x)
|
||
{
|
||
rtx addr;
|
||
|
||
if (x == 0)
|
||
return;
|
||
|
||
/* If this is a CONCAT, recurse for the pieces. */
|
||
if (GET_CODE (x) == CONCAT)
|
||
{
|
||
instantiate_decl (XEXP (x, 0));
|
||
instantiate_decl (XEXP (x, 1));
|
||
return;
|
||
}
|
||
|
||
/* If this is not a MEM, no need to do anything. Similarly if the
|
||
address is a constant or a register that is not a virtual register. */
|
||
if (!MEM_P (x))
|
||
return;
|
||
|
||
addr = XEXP (x, 0);
|
||
if (CONSTANT_P (addr)
|
||
|| (REG_P (addr)
|
||
&& (REGNO (addr) < FIRST_VIRTUAL_REGISTER
|
||
|| REGNO (addr) > LAST_VIRTUAL_REGISTER)))
|
||
return;
|
||
|
||
for_each_rtx (&XEXP (x, 0), instantiate_virtual_regs_in_rtx, NULL);
|
||
}
|
||
|
||
/* Helper for instantiate_decls called via walk_tree: Process all decls
|
||
in the given DECL_VALUE_EXPR. */
|
||
|
||
static tree
|
||
instantiate_expr (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
|
||
{
|
||
tree t = *tp;
|
||
if (! EXPR_P (t))
|
||
{
|
||
*walk_subtrees = 0;
|
||
if (DECL_P (t) && DECL_RTL_SET_P (t))
|
||
instantiate_decl (DECL_RTL (t));
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
/* Subroutine of instantiate_decls: Process all decls in the given
|
||
BLOCK node and all its subblocks. */
|
||
|
||
static void
|
||
instantiate_decls_1 (tree let)
|
||
{
|
||
tree t;
|
||
|
||
for (t = BLOCK_VARS (let); t; t = TREE_CHAIN (t))
|
||
{
|
||
if (DECL_RTL_SET_P (t))
|
||
instantiate_decl (DECL_RTL (t));
|
||
if (TREE_CODE (t) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (t))
|
||
{
|
||
tree v = DECL_VALUE_EXPR (t);
|
||
walk_tree (&v, instantiate_expr, NULL, NULL);
|
||
}
|
||
}
|
||
|
||
/* Process all subblocks. */
|
||
for (t = BLOCK_SUBBLOCKS (let); t; t = TREE_CHAIN (t))
|
||
instantiate_decls_1 (t);
|
||
}
|
||
|
||
/* Scan all decls in FNDECL (both variables and parameters) and instantiate
|
||
all virtual registers in their DECL_RTL's. */
|
||
|
||
static void
|
||
instantiate_decls (tree fndecl)
|
||
{
|
||
tree decl;
|
||
|
||
/* Process all parameters of the function. */
|
||
for (decl = DECL_ARGUMENTS (fndecl); decl; decl = TREE_CHAIN (decl))
|
||
{
|
||
instantiate_decl (DECL_RTL (decl));
|
||
instantiate_decl (DECL_INCOMING_RTL (decl));
|
||
if (DECL_HAS_VALUE_EXPR_P (decl))
|
||
{
|
||
tree v = DECL_VALUE_EXPR (decl);
|
||
walk_tree (&v, instantiate_expr, NULL, NULL);
|
||
}
|
||
}
|
||
|
||
/* Now process all variables defined in the function or its subblocks. */
|
||
instantiate_decls_1 (DECL_INITIAL (fndecl));
|
||
}
|
||
|
||
/* Pass through the INSNS of function FNDECL and convert virtual register
|
||
references to hard register references. */
|
||
|
||
static unsigned int
|
||
instantiate_virtual_regs (void)
|
||
{
|
||
rtx insn;
|
||
|
||
/* Compute the offsets to use for this function. */
|
||
in_arg_offset = FIRST_PARM_OFFSET (current_function_decl);
|
||
var_offset = STARTING_FRAME_OFFSET;
|
||
dynamic_offset = STACK_DYNAMIC_OFFSET (current_function_decl);
|
||
out_arg_offset = STACK_POINTER_OFFSET;
|
||
#ifdef FRAME_POINTER_CFA_OFFSET
|
||
cfa_offset = FRAME_POINTER_CFA_OFFSET (current_function_decl);
|
||
#else
|
||
cfa_offset = ARG_POINTER_CFA_OFFSET (current_function_decl);
|
||
#endif
|
||
|
||
/* Initialize recognition, indicating that volatile is OK. */
|
||
init_recog ();
|
||
|
||
/* Scan through all the insns, instantiating every virtual register still
|
||
present. */
|
||
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
|
||
if (INSN_P (insn))
|
||
{
|
||
/* These patterns in the instruction stream can never be recognized.
|
||
Fortunately, they shouldn't contain virtual registers either. */
|
||
if (GET_CODE (PATTERN (insn)) == USE
|
||
|| GET_CODE (PATTERN (insn)) == CLOBBER
|
||
|| GET_CODE (PATTERN (insn)) == ADDR_VEC
|
||
|| GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC
|
||
|| GET_CODE (PATTERN (insn)) == ASM_INPUT)
|
||
continue;
|
||
|
||
instantiate_virtual_regs_in_insn (insn);
|
||
|
||
if (INSN_DELETED_P (insn))
|
||
continue;
|
||
|
||
for_each_rtx (®_NOTES (insn), instantiate_virtual_regs_in_rtx, NULL);
|
||
|
||
/* Instantiate any virtual registers in CALL_INSN_FUNCTION_USAGE. */
|
||
if (GET_CODE (insn) == CALL_INSN)
|
||
for_each_rtx (&CALL_INSN_FUNCTION_USAGE (insn),
|
||
instantiate_virtual_regs_in_rtx, NULL);
|
||
}
|
||
|
||
/* Instantiate the virtual registers in the DECLs for debugging purposes. */
|
||
instantiate_decls (current_function_decl);
|
||
|
||
/* Indicate that, from now on, assign_stack_local should use
|
||
frame_pointer_rtx. */
|
||
virtuals_instantiated = 1;
|
||
return 0;
|
||
}
|
||
|
||
struct tree_opt_pass pass_instantiate_virtual_regs =
|
||
{
|
||
"vregs", /* name */
|
||
NULL, /* gate */
|
||
instantiate_virtual_regs, /* execute */
|
||
NULL, /* sub */
|
||
NULL, /* next */
|
||
0, /* static_pass_number */
|
||
0, /* tv_id */
|
||
0, /* properties_required */
|
||
0, /* properties_provided */
|
||
0, /* properties_destroyed */
|
||
0, /* todo_flags_start */
|
||
TODO_dump_func, /* todo_flags_finish */
|
||
0 /* letter */
|
||
};
|
||
|
||
|
||
/* Return 1 if EXP is an aggregate type (or a value with aggregate type).
|
||
This means a type for which function calls must pass an address to the
|
||
function or get an address back from the function.
|
||
EXP may be a type node or an expression (whose type is tested). */
|
||
|
||
int
|
||
aggregate_value_p (tree exp, tree fntype)
|
||
{
|
||
int i, regno, nregs;
|
||
rtx reg;
|
||
|
||
tree type = (TYPE_P (exp)) ? exp : TREE_TYPE (exp);
|
||
|
||
/* DECL node associated with FNTYPE when relevant, which we might need to
|
||
check for by-invisible-reference returns, typically for CALL_EXPR input
|
||
EXPressions. */
|
||
tree fndecl = NULL_TREE;
|
||
|
||
if (fntype)
|
||
switch (TREE_CODE (fntype))
|
||
{
|
||
case CALL_EXPR:
|
||
fndecl = get_callee_fndecl (fntype);
|
||
fntype = fndecl ? TREE_TYPE (fndecl) : 0;
|
||
break;
|
||
case FUNCTION_DECL:
|
||
fndecl = fntype;
|
||
fntype = TREE_TYPE (fndecl);
|
||
break;
|
||
case FUNCTION_TYPE:
|
||
case METHOD_TYPE:
|
||
break;
|
||
case IDENTIFIER_NODE:
|
||
fntype = 0;
|
||
break;
|
||
default:
|
||
/* We don't expect other rtl types here. */
|
||
gcc_unreachable ();
|
||
}
|
||
|
||
if (TREE_CODE (type) == VOID_TYPE)
|
||
return 0;
|
||
|
||
/* If the front end has decided that this needs to be passed by
|
||
reference, do so. */
|
||
if ((TREE_CODE (exp) == PARM_DECL || TREE_CODE (exp) == RESULT_DECL)
|
||
&& DECL_BY_REFERENCE (exp))
|
||
return 1;
|
||
|
||
/* If the EXPression is a CALL_EXPR, honor DECL_BY_REFERENCE set on the
|
||
called function RESULT_DECL, meaning the function returns in memory by
|
||
invisible reference. This check lets front-ends not set TREE_ADDRESSABLE
|
||
on the function type, which used to be the way to request such a return
|
||
mechanism but might now be causing troubles at gimplification time if
|
||
temporaries with the function type need to be created. */
|
||
if (TREE_CODE (exp) == CALL_EXPR && fndecl && DECL_RESULT (fndecl)
|
||
&& DECL_BY_REFERENCE (DECL_RESULT (fndecl)))
|
||
return 1;
|
||
|
||
if (targetm.calls.return_in_memory (type, fntype))
|
||
return 1;
|
||
/* Types that are TREE_ADDRESSABLE must be constructed in memory,
|
||
and thus can't be returned in registers. */
|
||
if (TREE_ADDRESSABLE (type))
|
||
return 1;
|
||
if (flag_pcc_struct_return && AGGREGATE_TYPE_P (type))
|
||
return 1;
|
||
/* Make sure we have suitable call-clobbered regs to return
|
||
the value in; if not, we must return it in memory. */
|
||
reg = hard_function_value (type, 0, fntype, 0);
|
||
|
||
/* If we have something other than a REG (e.g. a PARALLEL), then assume
|
||
it is OK. */
|
||
if (!REG_P (reg))
|
||
return 0;
|
||
|
||
regno = REGNO (reg);
|
||
nregs = hard_regno_nregs[regno][TYPE_MODE (type)];
|
||
for (i = 0; i < nregs; i++)
|
||
if (! call_used_regs[regno + i])
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
/* Return true if we should assign DECL a pseudo register; false if it
|
||
should live on the local stack. */
|
||
|
||
bool
|
||
use_register_for_decl (tree decl)
|
||
{
|
||
/* Honor volatile. */
|
||
if (TREE_SIDE_EFFECTS (decl))
|
||
return false;
|
||
|
||
/* Honor addressability. */
|
||
if (TREE_ADDRESSABLE (decl))
|
||
return false;
|
||
|
||
/* Only register-like things go in registers. */
|
||
if (DECL_MODE (decl) == BLKmode)
|
||
return false;
|
||
|
||
/* If -ffloat-store specified, don't put explicit float variables
|
||
into registers. */
|
||
/* ??? This should be checked after DECL_ARTIFICIAL, but tree-ssa
|
||
propagates values across these stores, and it probably shouldn't. */
|
||
if (flag_float_store && FLOAT_TYPE_P (TREE_TYPE (decl)))
|
||
return false;
|
||
|
||
/* If we're not interested in tracking debugging information for
|
||
this decl, then we can certainly put it in a register. */
|
||
if (DECL_IGNORED_P (decl))
|
||
return true;
|
||
|
||
return (optimize || DECL_REGISTER (decl));
|
||
}
|
||
|
||
/* Return true if TYPE should be passed by invisible reference. */
|
||
|
||
bool
|
||
pass_by_reference (CUMULATIVE_ARGS *ca, enum machine_mode mode,
|
||
tree type, bool named_arg)
|
||
{
|
||
if (type)
|
||
{
|
||
/* If this type contains non-trivial constructors, then it is
|
||
forbidden for the middle-end to create any new copies. */
|
||
if (TREE_ADDRESSABLE (type))
|
||
return true;
|
||
|
||
/* GCC post 3.4 passes *all* variable sized types by reference. */
|
||
if (!TYPE_SIZE (type) || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
|
||
return true;
|
||
}
|
||
|
||
return targetm.calls.pass_by_reference (ca, mode, type, named_arg);
|
||
}
|
||
|
||
/* Return true if TYPE, which is passed by reference, should be callee
|
||
copied instead of caller copied. */
|
||
|
||
bool
|
||
reference_callee_copied (CUMULATIVE_ARGS *ca, enum machine_mode mode,
|
||
tree type, bool named_arg)
|
||
{
|
||
if (type && TREE_ADDRESSABLE (type))
|
||
return false;
|
||
return targetm.calls.callee_copies (ca, mode, type, named_arg);
|
||
}
|
||
|
||
/* Structures to communicate between the subroutines of assign_parms.
|
||
The first holds data persistent across all parameters, the second
|
||
is cleared out for each parameter. */
|
||
|
||
struct assign_parm_data_all
|
||
{
|
||
CUMULATIVE_ARGS args_so_far;
|
||
struct args_size stack_args_size;
|
||
tree function_result_decl;
|
||
tree orig_fnargs;
|
||
rtx conversion_insns;
|
||
HOST_WIDE_INT pretend_args_size;
|
||
HOST_WIDE_INT extra_pretend_bytes;
|
||
int reg_parm_stack_space;
|
||
};
|
||
|
||
struct assign_parm_data_one
|
||
{
|
||
tree nominal_type;
|
||
tree passed_type;
|
||
rtx entry_parm;
|
||
rtx stack_parm;
|
||
enum machine_mode nominal_mode;
|
||
enum machine_mode passed_mode;
|
||
enum machine_mode promoted_mode;
|
||
struct locate_and_pad_arg_data locate;
|
||
int partial;
|
||
BOOL_BITFIELD named_arg : 1;
|
||
BOOL_BITFIELD passed_pointer : 1;
|
||
BOOL_BITFIELD on_stack : 1;
|
||
BOOL_BITFIELD loaded_in_reg : 1;
|
||
};
|
||
|
||
/* A subroutine of assign_parms. Initialize ALL. */
|
||
|
||
static void
|
||
assign_parms_initialize_all (struct assign_parm_data_all *all)
|
||
{
|
||
tree fntype;
|
||
|
||
memset (all, 0, sizeof (*all));
|
||
|
||
fntype = TREE_TYPE (current_function_decl);
|
||
|
||
#ifdef INIT_CUMULATIVE_INCOMING_ARGS
|
||
INIT_CUMULATIVE_INCOMING_ARGS (all->args_so_far, fntype, NULL_RTX);
|
||
#else
|
||
INIT_CUMULATIVE_ARGS (all->args_so_far, fntype, NULL_RTX,
|
||
current_function_decl, -1);
|
||
#endif
|
||
|
||
#ifdef REG_PARM_STACK_SPACE
|
||
all->reg_parm_stack_space = REG_PARM_STACK_SPACE (current_function_decl);
|
||
#endif
|
||
}
|
||
|
||
/* If ARGS contains entries with complex types, split the entry into two
|
||
entries of the component type. Return a new list of substitutions are
|
||
needed, else the old list. */
|
||
|
||
static tree
|
||
split_complex_args (tree args)
|
||
{
|
||
tree p;
|
||
|
||
/* Before allocating memory, check for the common case of no complex. */
|
||
for (p = args; p; p = TREE_CHAIN (p))
|
||
{
|
||
tree type = TREE_TYPE (p);
|
||
if (TREE_CODE (type) == COMPLEX_TYPE
|
||
&& targetm.calls.split_complex_arg (type))
|
||
goto found;
|
||
}
|
||
return args;
|
||
|
||
found:
|
||
args = copy_list (args);
|
||
|
||
for (p = args; p; p = TREE_CHAIN (p))
|
||
{
|
||
tree type = TREE_TYPE (p);
|
||
if (TREE_CODE (type) == COMPLEX_TYPE
|
||
&& targetm.calls.split_complex_arg (type))
|
||
{
|
||
tree decl;
|
||
tree subtype = TREE_TYPE (type);
|
||
bool addressable = TREE_ADDRESSABLE (p);
|
||
|
||
/* Rewrite the PARM_DECL's type with its component. */
|
||
TREE_TYPE (p) = subtype;
|
||
DECL_ARG_TYPE (p) = TREE_TYPE (DECL_ARG_TYPE (p));
|
||
DECL_MODE (p) = VOIDmode;
|
||
DECL_SIZE (p) = NULL;
|
||
DECL_SIZE_UNIT (p) = NULL;
|
||
/* If this arg must go in memory, put it in a pseudo here.
|
||
We can't allow it to go in memory as per normal parms,
|
||
because the usual place might not have the imag part
|
||
adjacent to the real part. */
|
||
DECL_ARTIFICIAL (p) = addressable;
|
||
DECL_IGNORED_P (p) = addressable;
|
||
TREE_ADDRESSABLE (p) = 0;
|
||
layout_decl (p, 0);
|
||
|
||
/* Build a second synthetic decl. */
|
||
decl = build_decl (PARM_DECL, NULL_TREE, subtype);
|
||
DECL_ARG_TYPE (decl) = DECL_ARG_TYPE (p);
|
||
DECL_ARTIFICIAL (decl) = addressable;
|
||
DECL_IGNORED_P (decl) = addressable;
|
||
layout_decl (decl, 0);
|
||
|
||
/* Splice it in; skip the new decl. */
|
||
TREE_CHAIN (decl) = TREE_CHAIN (p);
|
||
TREE_CHAIN (p) = decl;
|
||
p = decl;
|
||
}
|
||
}
|
||
|
||
return args;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Adjust the parameter list to incorporate
|
||
the hidden struct return argument, and (abi willing) complex args.
|
||
Return the new parameter list. */
|
||
|
||
static tree
|
||
assign_parms_augmented_arg_list (struct assign_parm_data_all *all)
|
||
{
|
||
tree fndecl = current_function_decl;
|
||
tree fntype = TREE_TYPE (fndecl);
|
||
tree fnargs = DECL_ARGUMENTS (fndecl);
|
||
|
||
/* If struct value address is treated as the first argument, make it so. */
|
||
if (aggregate_value_p (DECL_RESULT (fndecl), fndecl)
|
||
&& ! current_function_returns_pcc_struct
|
||
&& targetm.calls.struct_value_rtx (TREE_TYPE (fndecl), 1) == 0)
|
||
{
|
||
tree type = build_pointer_type (TREE_TYPE (fntype));
|
||
tree decl;
|
||
|
||
decl = build_decl (PARM_DECL, NULL_TREE, type);
|
||
DECL_ARG_TYPE (decl) = type;
|
||
DECL_ARTIFICIAL (decl) = 1;
|
||
DECL_IGNORED_P (decl) = 1;
|
||
|
||
TREE_CHAIN (decl) = fnargs;
|
||
fnargs = decl;
|
||
all->function_result_decl = decl;
|
||
}
|
||
|
||
all->orig_fnargs = fnargs;
|
||
|
||
/* If the target wants to split complex arguments into scalars, do so. */
|
||
if (targetm.calls.split_complex_arg)
|
||
fnargs = split_complex_args (fnargs);
|
||
|
||
return fnargs;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Examine PARM and pull out type and mode
|
||
data for the parameter. Incorporate ABI specifics such as pass-by-
|
||
reference and type promotion. */
|
||
|
||
static void
|
||
assign_parm_find_data_types (struct assign_parm_data_all *all, tree parm,
|
||
struct assign_parm_data_one *data)
|
||
{
|
||
tree nominal_type, passed_type;
|
||
enum machine_mode nominal_mode, passed_mode, promoted_mode;
|
||
|
||
memset (data, 0, sizeof (*data));
|
||
|
||
/* NAMED_ARG is a mis-nomer. We really mean 'non-varadic'. */
|
||
if (!current_function_stdarg)
|
||
data->named_arg = 1; /* No varadic parms. */
|
||
else if (TREE_CHAIN (parm))
|
||
data->named_arg = 1; /* Not the last non-varadic parm. */
|
||
else if (targetm.calls.strict_argument_naming (&all->args_so_far))
|
||
data->named_arg = 1; /* Only varadic ones are unnamed. */
|
||
else
|
||
data->named_arg = 0; /* Treat as varadic. */
|
||
|
||
nominal_type = TREE_TYPE (parm);
|
||
passed_type = DECL_ARG_TYPE (parm);
|
||
|
||
/* Look out for errors propagating this far. Also, if the parameter's
|
||
type is void then its value doesn't matter. */
|
||
if (TREE_TYPE (parm) == error_mark_node
|
||
/* This can happen after weird syntax errors
|
||
or if an enum type is defined among the parms. */
|
||
|| TREE_CODE (parm) != PARM_DECL
|
||
|| passed_type == NULL
|
||
|| VOID_TYPE_P (nominal_type))
|
||
{
|
||
nominal_type = passed_type = void_type_node;
|
||
nominal_mode = passed_mode = promoted_mode = VOIDmode;
|
||
goto egress;
|
||
}
|
||
|
||
/* Find mode of arg as it is passed, and mode of arg as it should be
|
||
during execution of this function. */
|
||
passed_mode = TYPE_MODE (passed_type);
|
||
nominal_mode = TYPE_MODE (nominal_type);
|
||
|
||
/* If the parm is to be passed as a transparent union, use the type of
|
||
the first field for the tests below. We have already verified that
|
||
the modes are the same. */
|
||
if (TREE_CODE (passed_type) == UNION_TYPE
|
||
&& TYPE_TRANSPARENT_UNION (passed_type))
|
||
passed_type = TREE_TYPE (TYPE_FIELDS (passed_type));
|
||
|
||
/* See if this arg was passed by invisible reference. */
|
||
if (pass_by_reference (&all->args_so_far, passed_mode,
|
||
passed_type, data->named_arg))
|
||
{
|
||
passed_type = nominal_type = build_pointer_type (passed_type);
|
||
data->passed_pointer = true;
|
||
passed_mode = nominal_mode = Pmode;
|
||
}
|
||
|
||
/* Find mode as it is passed by the ABI. */
|
||
promoted_mode = passed_mode;
|
||
if (targetm.calls.promote_function_args (TREE_TYPE (current_function_decl)))
|
||
{
|
||
int unsignedp = TYPE_UNSIGNED (passed_type);
|
||
promoted_mode = promote_mode (passed_type, promoted_mode,
|
||
&unsignedp, 1);
|
||
}
|
||
|
||
egress:
|
||
data->nominal_type = nominal_type;
|
||
data->passed_type = passed_type;
|
||
data->nominal_mode = nominal_mode;
|
||
data->passed_mode = passed_mode;
|
||
data->promoted_mode = promoted_mode;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Invoke setup_incoming_varargs. */
|
||
|
||
static void
|
||
assign_parms_setup_varargs (struct assign_parm_data_all *all,
|
||
struct assign_parm_data_one *data, bool no_rtl)
|
||
{
|
||
int varargs_pretend_bytes = 0;
|
||
|
||
targetm.calls.setup_incoming_varargs (&all->args_so_far,
|
||
data->promoted_mode,
|
||
data->passed_type,
|
||
&varargs_pretend_bytes, no_rtl);
|
||
|
||
/* If the back-end has requested extra stack space, record how much is
|
||
needed. Do not change pretend_args_size otherwise since it may be
|
||
nonzero from an earlier partial argument. */
|
||
if (varargs_pretend_bytes > 0)
|
||
all->pretend_args_size = varargs_pretend_bytes;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Set DATA->ENTRY_PARM corresponding to
|
||
the incoming location of the current parameter. */
|
||
|
||
static void
|
||
assign_parm_find_entry_rtl (struct assign_parm_data_all *all,
|
||
struct assign_parm_data_one *data)
|
||
{
|
||
HOST_WIDE_INT pretend_bytes = 0;
|
||
rtx entry_parm;
|
||
bool in_regs;
|
||
|
||
if (data->promoted_mode == VOIDmode)
|
||
{
|
||
data->entry_parm = data->stack_parm = const0_rtx;
|
||
return;
|
||
}
|
||
|
||
#ifdef FUNCTION_INCOMING_ARG
|
||
entry_parm = FUNCTION_INCOMING_ARG (all->args_so_far, data->promoted_mode,
|
||
data->passed_type, data->named_arg);
|
||
#else
|
||
entry_parm = FUNCTION_ARG (all->args_so_far, data->promoted_mode,
|
||
data->passed_type, data->named_arg);
|
||
#endif
|
||
|
||
if (entry_parm == 0)
|
||
data->promoted_mode = data->passed_mode;
|
||
|
||
/* Determine parm's home in the stack, in case it arrives in the stack
|
||
or we should pretend it did. Compute the stack position and rtx where
|
||
the argument arrives and its size.
|
||
|
||
There is one complexity here: If this was a parameter that would
|
||
have been passed in registers, but wasn't only because it is
|
||
__builtin_va_alist, we want locate_and_pad_parm to treat it as if
|
||
it came in a register so that REG_PARM_STACK_SPACE isn't skipped.
|
||
In this case, we call FUNCTION_ARG with NAMED set to 1 instead of 0
|
||
as it was the previous time. */
|
||
in_regs = entry_parm != 0;
|
||
#ifdef STACK_PARMS_IN_REG_PARM_AREA
|
||
in_regs = true;
|
||
#endif
|
||
if (!in_regs && !data->named_arg)
|
||
{
|
||
if (targetm.calls.pretend_outgoing_varargs_named (&all->args_so_far))
|
||
{
|
||
rtx tem;
|
||
#ifdef FUNCTION_INCOMING_ARG
|
||
tem = FUNCTION_INCOMING_ARG (all->args_so_far, data->promoted_mode,
|
||
data->passed_type, true);
|
||
#else
|
||
tem = FUNCTION_ARG (all->args_so_far, data->promoted_mode,
|
||
data->passed_type, true);
|
||
#endif
|
||
in_regs = tem != NULL;
|
||
}
|
||
}
|
||
|
||
/* If this parameter was passed both in registers and in the stack, use
|
||
the copy on the stack. */
|
||
if (targetm.calls.must_pass_in_stack (data->promoted_mode,
|
||
data->passed_type))
|
||
entry_parm = 0;
|
||
|
||
if (entry_parm)
|
||
{
|
||
int partial;
|
||
|
||
partial = targetm.calls.arg_partial_bytes (&all->args_so_far,
|
||
data->promoted_mode,
|
||
data->passed_type,
|
||
data->named_arg);
|
||
data->partial = partial;
|
||
|
||
/* The caller might already have allocated stack space for the
|
||
register parameters. */
|
||
if (partial != 0 && all->reg_parm_stack_space == 0)
|
||
{
|
||
/* Part of this argument is passed in registers and part
|
||
is passed on the stack. Ask the prologue code to extend
|
||
the stack part so that we can recreate the full value.
|
||
|
||
PRETEND_BYTES is the size of the registers we need to store.
|
||
CURRENT_FUNCTION_PRETEND_ARGS_SIZE is the amount of extra
|
||
stack space that the prologue should allocate.
|
||
|
||
Internally, gcc assumes that the argument pointer is aligned
|
||
to STACK_BOUNDARY bits. This is used both for alignment
|
||
optimizations (see init_emit) and to locate arguments that are
|
||
aligned to more than PARM_BOUNDARY bits. We must preserve this
|
||
invariant by rounding CURRENT_FUNCTION_PRETEND_ARGS_SIZE up to
|
||
a stack boundary. */
|
||
|
||
/* We assume at most one partial arg, and it must be the first
|
||
argument on the stack. */
|
||
gcc_assert (!all->extra_pretend_bytes && !all->pretend_args_size);
|
||
|
||
pretend_bytes = partial;
|
||
all->pretend_args_size = CEIL_ROUND (pretend_bytes, STACK_BYTES);
|
||
|
||
/* We want to align relative to the actual stack pointer, so
|
||
don't include this in the stack size until later. */
|
||
all->extra_pretend_bytes = all->pretend_args_size;
|
||
}
|
||
}
|
||
|
||
locate_and_pad_parm (data->promoted_mode, data->passed_type, in_regs,
|
||
entry_parm ? data->partial : 0, current_function_decl,
|
||
&all->stack_args_size, &data->locate);
|
||
|
||
/* Adjust offsets to include the pretend args. */
|
||
pretend_bytes = all->extra_pretend_bytes - pretend_bytes;
|
||
data->locate.slot_offset.constant += pretend_bytes;
|
||
data->locate.offset.constant += pretend_bytes;
|
||
|
||
data->entry_parm = entry_parm;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. If there is actually space on the stack
|
||
for this parm, count it in stack_args_size and return true. */
|
||
|
||
static bool
|
||
assign_parm_is_stack_parm (struct assign_parm_data_all *all,
|
||
struct assign_parm_data_one *data)
|
||
{
|
||
/* Trivially true if we've no incoming register. */
|
||
if (data->entry_parm == NULL)
|
||
;
|
||
/* Also true if we're partially in registers and partially not,
|
||
since we've arranged to drop the entire argument on the stack. */
|
||
else if (data->partial != 0)
|
||
;
|
||
/* Also true if the target says that it's passed in both registers
|
||
and on the stack. */
|
||
else if (GET_CODE (data->entry_parm) == PARALLEL
|
||
&& XEXP (XVECEXP (data->entry_parm, 0, 0), 0) == NULL_RTX)
|
||
;
|
||
/* Also true if the target says that there's stack allocated for
|
||
all register parameters. */
|
||
else if (all->reg_parm_stack_space > 0)
|
||
;
|
||
/* Otherwise, no, this parameter has no ABI defined stack slot. */
|
||
else
|
||
return false;
|
||
|
||
all->stack_args_size.constant += data->locate.size.constant;
|
||
if (data->locate.size.var)
|
||
ADD_PARM_SIZE (all->stack_args_size, data->locate.size.var);
|
||
|
||
return true;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Given that this parameter is allocated
|
||
stack space by the ABI, find it. */
|
||
|
||
static void
|
||
assign_parm_find_stack_rtl (tree parm, struct assign_parm_data_one *data)
|
||
{
|
||
rtx offset_rtx, stack_parm;
|
||
unsigned int align, boundary;
|
||
|
||
/* If we're passing this arg using a reg, make its stack home the
|
||
aligned stack slot. */
|
||
if (data->entry_parm)
|
||
offset_rtx = ARGS_SIZE_RTX (data->locate.slot_offset);
|
||
else
|
||
offset_rtx = ARGS_SIZE_RTX (data->locate.offset);
|
||
|
||
stack_parm = current_function_internal_arg_pointer;
|
||
if (offset_rtx != const0_rtx)
|
||
stack_parm = gen_rtx_PLUS (Pmode, stack_parm, offset_rtx);
|
||
stack_parm = gen_rtx_MEM (data->promoted_mode, stack_parm);
|
||
|
||
set_mem_attributes (stack_parm, parm, 1);
|
||
|
||
boundary = data->locate.boundary;
|
||
align = BITS_PER_UNIT;
|
||
|
||
/* If we're padding upward, we know that the alignment of the slot
|
||
is FUNCTION_ARG_BOUNDARY. If we're using slot_offset, we're
|
||
intentionally forcing upward padding. Otherwise we have to come
|
||
up with a guess at the alignment based on OFFSET_RTX. */
|
||
if (data->locate.where_pad != downward || data->entry_parm)
|
||
align = boundary;
|
||
else if (GET_CODE (offset_rtx) == CONST_INT)
|
||
{
|
||
align = INTVAL (offset_rtx) * BITS_PER_UNIT | boundary;
|
||
align = align & -align;
|
||
}
|
||
set_mem_align (stack_parm, align);
|
||
|
||
if (data->entry_parm)
|
||
set_reg_attrs_for_parm (data->entry_parm, stack_parm);
|
||
|
||
data->stack_parm = stack_parm;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Adjust DATA->ENTRY_RTL such that it's
|
||
always valid and contiguous. */
|
||
|
||
static void
|
||
assign_parm_adjust_entry_rtl (struct assign_parm_data_one *data)
|
||
{
|
||
rtx entry_parm = data->entry_parm;
|
||
rtx stack_parm = data->stack_parm;
|
||
|
||
/* If this parm was passed part in regs and part in memory, pretend it
|
||
arrived entirely in memory by pushing the register-part onto the stack.
|
||
In the special case of a DImode or DFmode that is split, we could put
|
||
it together in a pseudoreg directly, but for now that's not worth
|
||
bothering with. */
|
||
if (data->partial != 0)
|
||
{
|
||
/* Handle calls that pass values in multiple non-contiguous
|
||
locations. The Irix 6 ABI has examples of this. */
|
||
if (GET_CODE (entry_parm) == PARALLEL)
|
||
emit_group_store (validize_mem (stack_parm), entry_parm,
|
||
data->passed_type,
|
||
int_size_in_bytes (data->passed_type));
|
||
else
|
||
{
|
||
gcc_assert (data->partial % UNITS_PER_WORD == 0);
|
||
move_block_from_reg (REGNO (entry_parm), validize_mem (stack_parm),
|
||
data->partial / UNITS_PER_WORD);
|
||
}
|
||
|
||
entry_parm = stack_parm;
|
||
}
|
||
|
||
/* If we didn't decide this parm came in a register, by default it came
|
||
on the stack. */
|
||
else if (entry_parm == NULL)
|
||
entry_parm = stack_parm;
|
||
|
||
/* When an argument is passed in multiple locations, we can't make use
|
||
of this information, but we can save some copying if the whole argument
|
||
is passed in a single register. */
|
||
else if (GET_CODE (entry_parm) == PARALLEL
|
||
&& data->nominal_mode != BLKmode
|
||
&& data->passed_mode != BLKmode)
|
||
{
|
||
size_t i, len = XVECLEN (entry_parm, 0);
|
||
|
||
for (i = 0; i < len; i++)
|
||
if (XEXP (XVECEXP (entry_parm, 0, i), 0) != NULL_RTX
|
||
&& REG_P (XEXP (XVECEXP (entry_parm, 0, i), 0))
|
||
&& (GET_MODE (XEXP (XVECEXP (entry_parm, 0, i), 0))
|
||
== data->passed_mode)
|
||
&& INTVAL (XEXP (XVECEXP (entry_parm, 0, i), 1)) == 0)
|
||
{
|
||
entry_parm = XEXP (XVECEXP (entry_parm, 0, i), 0);
|
||
break;
|
||
}
|
||
}
|
||
|
||
data->entry_parm = entry_parm;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Adjust DATA->STACK_RTL such that it's
|
||
always valid and properly aligned. */
|
||
|
||
static void
|
||
assign_parm_adjust_stack_rtl (struct assign_parm_data_one *data)
|
||
{
|
||
rtx stack_parm = data->stack_parm;
|
||
|
||
/* If we can't trust the parm stack slot to be aligned enough for its
|
||
ultimate type, don't use that slot after entry. We'll make another
|
||
stack slot, if we need one. */
|
||
if (stack_parm
|
||
&& ((STRICT_ALIGNMENT
|
||
&& GET_MODE_ALIGNMENT (data->nominal_mode) > MEM_ALIGN (stack_parm))
|
||
|| (data->nominal_type
|
||
&& TYPE_ALIGN (data->nominal_type) > MEM_ALIGN (stack_parm)
|
||
&& MEM_ALIGN (stack_parm) < PREFERRED_STACK_BOUNDARY)))
|
||
stack_parm = NULL;
|
||
|
||
/* If parm was passed in memory, and we need to convert it on entry,
|
||
don't store it back in that same slot. */
|
||
else if (data->entry_parm == stack_parm
|
||
&& data->nominal_mode != BLKmode
|
||
&& data->nominal_mode != data->passed_mode)
|
||
stack_parm = NULL;
|
||
|
||
/* If stack protection is in effect for this function, don't leave any
|
||
pointers in their passed stack slots. */
|
||
else if (cfun->stack_protect_guard
|
||
&& (flag_stack_protect == 2
|
||
|| data->passed_pointer
|
||
|| POINTER_TYPE_P (data->nominal_type)))
|
||
stack_parm = NULL;
|
||
|
||
data->stack_parm = stack_parm;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Return true if the current parameter
|
||
should be stored as a BLKmode in the current frame. */
|
||
|
||
static bool
|
||
assign_parm_setup_block_p (struct assign_parm_data_one *data)
|
||
{
|
||
if (data->nominal_mode == BLKmode)
|
||
return true;
|
||
if (GET_CODE (data->entry_parm) == PARALLEL)
|
||
return true;
|
||
|
||
#ifdef BLOCK_REG_PADDING
|
||
/* Only assign_parm_setup_block knows how to deal with register arguments
|
||
that are padded at the least significant end. */
|
||
if (REG_P (data->entry_parm)
|
||
&& GET_MODE_SIZE (data->promoted_mode) < UNITS_PER_WORD
|
||
&& (BLOCK_REG_PADDING (data->passed_mode, data->passed_type, 1)
|
||
== (BYTES_BIG_ENDIAN ? upward : downward)))
|
||
return true;
|
||
#endif
|
||
|
||
return false;
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Arrange for the parameter to be
|
||
present and valid in DATA->STACK_RTL. */
|
||
|
||
static void
|
||
assign_parm_setup_block (struct assign_parm_data_all *all,
|
||
tree parm, struct assign_parm_data_one *data)
|
||
{
|
||
rtx entry_parm = data->entry_parm;
|
||
rtx stack_parm = data->stack_parm;
|
||
HOST_WIDE_INT size;
|
||
HOST_WIDE_INT size_stored;
|
||
rtx orig_entry_parm = entry_parm;
|
||
|
||
if (GET_CODE (entry_parm) == PARALLEL)
|
||
entry_parm = emit_group_move_into_temps (entry_parm);
|
||
|
||
/* If we've a non-block object that's nevertheless passed in parts,
|
||
reconstitute it in register operations rather than on the stack. */
|
||
if (GET_CODE (entry_parm) == PARALLEL
|
||
&& data->nominal_mode != BLKmode)
|
||
{
|
||
rtx elt0 = XEXP (XVECEXP (orig_entry_parm, 0, 0), 0);
|
||
|
||
if ((XVECLEN (entry_parm, 0) > 1
|
||
|| hard_regno_nregs[REGNO (elt0)][GET_MODE (elt0)] > 1)
|
||
&& use_register_for_decl (parm))
|
||
{
|
||
rtx parmreg = gen_reg_rtx (data->nominal_mode);
|
||
|
||
push_to_sequence (all->conversion_insns);
|
||
|
||
/* For values returned in multiple registers, handle possible
|
||
incompatible calls to emit_group_store.
|
||
|
||
For example, the following would be invalid, and would have to
|
||
be fixed by the conditional below:
|
||
|
||
emit_group_store ((reg:SF), (parallel:DF))
|
||
emit_group_store ((reg:SI), (parallel:DI))
|
||
|
||
An example of this are doubles in e500 v2:
|
||
(parallel:DF (expr_list (reg:SI) (const_int 0))
|
||
(expr_list (reg:SI) (const_int 4))). */
|
||
if (data->nominal_mode != data->passed_mode)
|
||
{
|
||
rtx t = gen_reg_rtx (GET_MODE (entry_parm));
|
||
emit_group_store (t, entry_parm, NULL_TREE,
|
||
GET_MODE_SIZE (GET_MODE (entry_parm)));
|
||
convert_move (parmreg, t, 0);
|
||
}
|
||
else
|
||
emit_group_store (parmreg, entry_parm, data->nominal_type,
|
||
int_size_in_bytes (data->nominal_type));
|
||
|
||
all->conversion_insns = get_insns ();
|
||
end_sequence ();
|
||
|
||
SET_DECL_RTL (parm, parmreg);
|
||
return;
|
||
}
|
||
}
|
||
|
||
size = int_size_in_bytes (data->passed_type);
|
||
size_stored = CEIL_ROUND (size, UNITS_PER_WORD);
|
||
if (stack_parm == 0)
|
||
{
|
||
DECL_ALIGN (parm) = MAX (DECL_ALIGN (parm), BITS_PER_WORD);
|
||
stack_parm = assign_stack_local (BLKmode, size_stored,
|
||
DECL_ALIGN (parm));
|
||
if (GET_MODE_SIZE (GET_MODE (entry_parm)) == size)
|
||
PUT_MODE (stack_parm, GET_MODE (entry_parm));
|
||
set_mem_attributes (stack_parm, parm, 1);
|
||
}
|
||
|
||
/* If a BLKmode arrives in registers, copy it to a stack slot. Handle
|
||
calls that pass values in multiple non-contiguous locations. */
|
||
if (REG_P (entry_parm) || GET_CODE (entry_parm) == PARALLEL)
|
||
{
|
||
rtx mem;
|
||
|
||
/* Note that we will be storing an integral number of words.
|
||
So we have to be careful to ensure that we allocate an
|
||
integral number of words. We do this above when we call
|
||
assign_stack_local if space was not allocated in the argument
|
||
list. If it was, this will not work if PARM_BOUNDARY is not
|
||
a multiple of BITS_PER_WORD. It isn't clear how to fix this
|
||
if it becomes a problem. Exception is when BLKmode arrives
|
||
with arguments not conforming to word_mode. */
|
||
|
||
if (data->stack_parm == 0)
|
||
;
|
||
else if (GET_CODE (entry_parm) == PARALLEL)
|
||
;
|
||
else
|
||
gcc_assert (!size || !(PARM_BOUNDARY % BITS_PER_WORD));
|
||
|
||
mem = validize_mem (stack_parm);
|
||
|
||
/* Handle values in multiple non-contiguous locations. */
|
||
if (GET_CODE (entry_parm) == PARALLEL)
|
||
{
|
||
push_to_sequence (all->conversion_insns);
|
||
emit_group_store (mem, entry_parm, data->passed_type, size);
|
||
all->conversion_insns = get_insns ();
|
||
end_sequence ();
|
||
}
|
||
|
||
else if (size == 0)
|
||
;
|
||
|
||
/* If SIZE is that of a mode no bigger than a word, just use
|
||
that mode's store operation. */
|
||
else if (size <= UNITS_PER_WORD)
|
||
{
|
||
enum machine_mode mode
|
||
= mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
|
||
|
||
if (mode != BLKmode
|
||
#ifdef BLOCK_REG_PADDING
|
||
&& (size == UNITS_PER_WORD
|
||
|| (BLOCK_REG_PADDING (mode, data->passed_type, 1)
|
||
!= (BYTES_BIG_ENDIAN ? upward : downward)))
|
||
#endif
|
||
)
|
||
{
|
||
rtx reg = gen_rtx_REG (mode, REGNO (entry_parm));
|
||
emit_move_insn (change_address (mem, mode, 0), reg);
|
||
}
|
||
|
||
/* Blocks smaller than a word on a BYTES_BIG_ENDIAN
|
||
machine must be aligned to the left before storing
|
||
to memory. Note that the previous test doesn't
|
||
handle all cases (e.g. SIZE == 3). */
|
||
else if (size != UNITS_PER_WORD
|
||
#ifdef BLOCK_REG_PADDING
|
||
&& (BLOCK_REG_PADDING (mode, data->passed_type, 1)
|
||
== downward)
|
||
#else
|
||
&& BYTES_BIG_ENDIAN
|
||
#endif
|
||
)
|
||
{
|
||
rtx tem, x;
|
||
int by = (UNITS_PER_WORD - size) * BITS_PER_UNIT;
|
||
rtx reg = gen_rtx_REG (word_mode, REGNO (entry_parm));
|
||
|
||
x = expand_shift (LSHIFT_EXPR, word_mode, reg,
|
||
build_int_cst (NULL_TREE, by),
|
||
NULL_RTX, 1);
|
||
tem = change_address (mem, word_mode, 0);
|
||
emit_move_insn (tem, x);
|
||
}
|
||
else
|
||
move_block_from_reg (REGNO (entry_parm), mem,
|
||
size_stored / UNITS_PER_WORD);
|
||
}
|
||
else
|
||
move_block_from_reg (REGNO (entry_parm), mem,
|
||
size_stored / UNITS_PER_WORD);
|
||
}
|
||
else if (data->stack_parm == 0)
|
||
{
|
||
push_to_sequence (all->conversion_insns);
|
||
emit_block_move (stack_parm, data->entry_parm, GEN_INT (size),
|
||
BLOCK_OP_NORMAL);
|
||
all->conversion_insns = get_insns ();
|
||
end_sequence ();
|
||
}
|
||
|
||
data->stack_parm = stack_parm;
|
||
SET_DECL_RTL (parm, stack_parm);
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Allocate a pseudo to hold the current
|
||
parameter. Get it there. Perform all ABI specified conversions. */
|
||
|
||
static void
|
||
assign_parm_setup_reg (struct assign_parm_data_all *all, tree parm,
|
||
struct assign_parm_data_one *data)
|
||
{
|
||
rtx parmreg;
|
||
enum machine_mode promoted_nominal_mode;
|
||
int unsignedp = TYPE_UNSIGNED (TREE_TYPE (parm));
|
||
bool did_conversion = false;
|
||
|
||
/* Store the parm in a pseudoregister during the function, but we may
|
||
need to do it in a wider mode. */
|
||
|
||
/* This is not really promoting for a call. However we need to be
|
||
consistent with assign_parm_find_data_types and expand_expr_real_1. */
|
||
promoted_nominal_mode
|
||
= promote_mode (data->nominal_type, data->nominal_mode, &unsignedp, 1);
|
||
|
||
parmreg = gen_reg_rtx (promoted_nominal_mode);
|
||
|
||
if (!DECL_ARTIFICIAL (parm))
|
||
mark_user_reg (parmreg);
|
||
|
||
/* If this was an item that we received a pointer to,
|
||
set DECL_RTL appropriately. */
|
||
if (data->passed_pointer)
|
||
{
|
||
rtx x = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (data->passed_type)), parmreg);
|
||
set_mem_attributes (x, parm, 1);
|
||
SET_DECL_RTL (parm, x);
|
||
}
|
||
else
|
||
SET_DECL_RTL (parm, parmreg);
|
||
|
||
/* Copy the value into the register. */
|
||
if (data->nominal_mode != data->passed_mode
|
||
|| promoted_nominal_mode != data->promoted_mode)
|
||
{
|
||
int save_tree_used;
|
||
|
||
/* ENTRY_PARM has been converted to PROMOTED_MODE, its
|
||
mode, by the caller. We now have to convert it to
|
||
NOMINAL_MODE, if different. However, PARMREG may be in
|
||
a different mode than NOMINAL_MODE if it is being stored
|
||
promoted.
|
||
|
||
If ENTRY_PARM is a hard register, it might be in a register
|
||
not valid for operating in its mode (e.g., an odd-numbered
|
||
register for a DFmode). In that case, moves are the only
|
||
thing valid, so we can't do a convert from there. This
|
||
occurs when the calling sequence allow such misaligned
|
||
usages.
|
||
|
||
In addition, the conversion may involve a call, which could
|
||
clobber parameters which haven't been copied to pseudo
|
||
registers yet. Therefore, we must first copy the parm to
|
||
a pseudo reg here, and save the conversion until after all
|
||
parameters have been moved. */
|
||
|
||
rtx tempreg = gen_reg_rtx (GET_MODE (data->entry_parm));
|
||
|
||
emit_move_insn (tempreg, validize_mem (data->entry_parm));
|
||
|
||
push_to_sequence (all->conversion_insns);
|
||
tempreg = convert_to_mode (data->nominal_mode, tempreg, unsignedp);
|
||
|
||
if (GET_CODE (tempreg) == SUBREG
|
||
&& GET_MODE (tempreg) == data->nominal_mode
|
||
&& REG_P (SUBREG_REG (tempreg))
|
||
&& data->nominal_mode == data->passed_mode
|
||
&& GET_MODE (SUBREG_REG (tempreg)) == GET_MODE (data->entry_parm)
|
||
&& GET_MODE_SIZE (GET_MODE (tempreg))
|
||
< GET_MODE_SIZE (GET_MODE (data->entry_parm)))
|
||
{
|
||
/* The argument is already sign/zero extended, so note it
|
||
into the subreg. */
|
||
SUBREG_PROMOTED_VAR_P (tempreg) = 1;
|
||
SUBREG_PROMOTED_UNSIGNED_SET (tempreg, unsignedp);
|
||
}
|
||
|
||
/* TREE_USED gets set erroneously during expand_assignment. */
|
||
save_tree_used = TREE_USED (parm);
|
||
expand_assignment (parm, make_tree (data->nominal_type, tempreg));
|
||
TREE_USED (parm) = save_tree_used;
|
||
all->conversion_insns = get_insns ();
|
||
end_sequence ();
|
||
|
||
did_conversion = true;
|
||
}
|
||
else
|
||
emit_move_insn (parmreg, validize_mem (data->entry_parm));
|
||
|
||
/* If we were passed a pointer but the actual value can safely live
|
||
in a register, put it in one. */
|
||
if (data->passed_pointer
|
||
&& TYPE_MODE (TREE_TYPE (parm)) != BLKmode
|
||
/* If by-reference argument was promoted, demote it. */
|
||
&& (TYPE_MODE (TREE_TYPE (parm)) != GET_MODE (DECL_RTL (parm))
|
||
|| use_register_for_decl (parm)))
|
||
{
|
||
/* We can't use nominal_mode, because it will have been set to
|
||
Pmode above. We must use the actual mode of the parm. */
|
||
parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm)));
|
||
mark_user_reg (parmreg);
|
||
|
||
if (GET_MODE (parmreg) != GET_MODE (DECL_RTL (parm)))
|
||
{
|
||
rtx tempreg = gen_reg_rtx (GET_MODE (DECL_RTL (parm)));
|
||
int unsigned_p = TYPE_UNSIGNED (TREE_TYPE (parm));
|
||
|
||
push_to_sequence (all->conversion_insns);
|
||
emit_move_insn (tempreg, DECL_RTL (parm));
|
||
tempreg = convert_to_mode (GET_MODE (parmreg), tempreg, unsigned_p);
|
||
emit_move_insn (parmreg, tempreg);
|
||
all->conversion_insns = get_insns ();
|
||
end_sequence ();
|
||
|
||
did_conversion = true;
|
||
}
|
||
else
|
||
emit_move_insn (parmreg, DECL_RTL (parm));
|
||
|
||
SET_DECL_RTL (parm, parmreg);
|
||
|
||
/* STACK_PARM is the pointer, not the parm, and PARMREG is
|
||
now the parm. */
|
||
data->stack_parm = NULL;
|
||
}
|
||
|
||
/* Mark the register as eliminable if we did no conversion and it was
|
||
copied from memory at a fixed offset, and the arg pointer was not
|
||
copied to a pseudo-reg. If the arg pointer is a pseudo reg or the
|
||
offset formed an invalid address, such memory-equivalences as we
|
||
make here would screw up life analysis for it. */
|
||
if (data->nominal_mode == data->passed_mode
|
||
&& !did_conversion
|
||
&& data->stack_parm != 0
|
||
&& MEM_P (data->stack_parm)
|
||
&& data->locate.offset.var == 0
|
||
&& reg_mentioned_p (virtual_incoming_args_rtx,
|
||
XEXP (data->stack_parm, 0)))
|
||
{
|
||
rtx linsn = get_last_insn ();
|
||
rtx sinsn, set;
|
||
|
||
/* Mark complex types separately. */
|
||
if (GET_CODE (parmreg) == CONCAT)
|
||
{
|
||
enum machine_mode submode
|
||
= GET_MODE_INNER (GET_MODE (parmreg));
|
||
int regnor = REGNO (XEXP (parmreg, 0));
|
||
int regnoi = REGNO (XEXP (parmreg, 1));
|
||
rtx stackr = adjust_address_nv (data->stack_parm, submode, 0);
|
||
rtx stacki = adjust_address_nv (data->stack_parm, submode,
|
||
GET_MODE_SIZE (submode));
|
||
|
||
/* Scan backwards for the set of the real and
|
||
imaginary parts. */
|
||
for (sinsn = linsn; sinsn != 0;
|
||
sinsn = prev_nonnote_insn (sinsn))
|
||
{
|
||
set = single_set (sinsn);
|
||
if (set == 0)
|
||
continue;
|
||
|
||
if (SET_DEST (set) == regno_reg_rtx [regnoi])
|
||
REG_NOTES (sinsn)
|
||
= gen_rtx_EXPR_LIST (REG_EQUIV, stacki,
|
||
REG_NOTES (sinsn));
|
||
else if (SET_DEST (set) == regno_reg_rtx [regnor])
|
||
REG_NOTES (sinsn)
|
||
= gen_rtx_EXPR_LIST (REG_EQUIV, stackr,
|
||
REG_NOTES (sinsn));
|
||
}
|
||
}
|
||
else if ((set = single_set (linsn)) != 0
|
||
&& SET_DEST (set) == parmreg)
|
||
REG_NOTES (linsn)
|
||
= gen_rtx_EXPR_LIST (REG_EQUIV,
|
||
data->stack_parm, REG_NOTES (linsn));
|
||
}
|
||
|
||
/* For pointer data type, suggest pointer register. */
|
||
if (POINTER_TYPE_P (TREE_TYPE (parm)))
|
||
mark_reg_pointer (parmreg,
|
||
TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm))));
|
||
}
|
||
|
||
/* A subroutine of assign_parms. Allocate stack space to hold the current
|
||
parameter. Get it there. Perform all ABI specified conversions. */
|
||
|
||
static void
|
||
assign_parm_setup_stack (struct assign_parm_data_all *all, tree parm,
|
||
struct assign_parm_data_one *data)
|
||
{
|
||
/* Value must be stored in the stack slot STACK_PARM during function
|
||
execution. */
|
||
bool to_conversion = false;
|
||
|
||
if (data->promoted_mode != data->nominal_mode)
|
||
{
|
||
/* Conversion is required. */
|
||
rtx tempreg = gen_reg_rtx (GET_MODE (data->entry_parm));
|
||
|
||
emit_move_insn (tempreg, validize_mem (data->entry_parm));
|
||
|
||
push_to_sequence (all->conversion_insns);
|
||
to_conversion = true;
|
||
|
||
data->entry_parm = convert_to_mode (data->nominal_mode, tempreg,
|
||
TYPE_UNSIGNED (TREE_TYPE (parm)));
|
||
|
||
if (data->stack_parm)
|
||
/* ??? This may need a big-endian conversion on sparc64. */
|
||
data->stack_parm
|
||
= adjust_address (data->stack_parm, data->nominal_mode, 0);
|
||
}
|
||
|
||
if (data->entry_parm != data->stack_parm)
|
||
{
|
||
rtx src, dest;
|
||
|
||
if (data->stack_parm == 0)
|
||
{
|
||
data->stack_parm
|
||
= assign_stack_local (GET_MODE (data->entry_parm),
|
||
GET_MODE_SIZE (GET_MODE (data->entry_parm)),
|
||
TYPE_ALIGN (data->passed_type));
|
||
set_mem_attributes (data->stack_parm, parm, 1);
|
||
}
|
||
|
||
dest = validize_mem (data->stack_parm);
|
||
src = validize_mem (data->entry_parm);
|
||
|
||
if (MEM_P (src))
|
||
{
|
||
/* Use a block move to handle potentially misaligned entry_parm. */
|
||
if (!to_conversion)
|
||
push_to_sequence (all->conversion_insns);
|
||
to_conversion = true;
|
||
|
||
emit_block_move (dest, src,
|
||
GEN_INT (int_size_in_bytes (data->passed_type)),
|
||
BLOCK_OP_NORMAL);
|
||
}
|
||
else
|
||
emit_move_insn (dest, src);
|
||
}
|
||
|
||
if (to_conversion)
|
||
{
|
||
all->conversion_insns = get_insns ();
|
||
end_sequence ();
|
||
}
|
||
|
||
SET_DECL_RTL (parm, data->stack_parm);
|
||
}
|
||
|
||
/* A subroutine of assign_parms. If the ABI splits complex arguments, then
|
||
undo the frobbing that we did in assign_parms_augmented_arg_list. */
|
||
|
||
static void
|
||
assign_parms_unsplit_complex (struct assign_parm_data_all *all, tree fnargs)
|
||
{
|
||
tree parm;
|
||
tree orig_fnargs = all->orig_fnargs;
|
||
|
||
for (parm = orig_fnargs; parm; parm = TREE_CHAIN (parm))
|
||
{
|
||
if (TREE_CODE (TREE_TYPE (parm)) == COMPLEX_TYPE
|
||
&& targetm.calls.split_complex_arg (TREE_TYPE (parm)))
|
||
{
|
||
rtx tmp, real, imag;
|
||
enum machine_mode inner = GET_MODE_INNER (DECL_MODE (parm));
|
||
|
||
real = DECL_RTL (fnargs);
|
||
imag = DECL_RTL (TREE_CHAIN (fnargs));
|
||
if (inner != GET_MODE (real))
|
||
{
|
||
real = gen_lowpart_SUBREG (inner, real);
|
||
imag = gen_lowpart_SUBREG (inner, imag);
|
||
}
|
||
|
||
if (TREE_ADDRESSABLE (parm))
|
||
{
|
||
rtx rmem, imem;
|
||
HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (parm));
|
||
|
||
/* split_complex_arg put the real and imag parts in
|
||
pseudos. Move them to memory. */
|
||
tmp = assign_stack_local (DECL_MODE (parm), size,
|
||
TYPE_ALIGN (TREE_TYPE (parm)));
|
||
set_mem_attributes (tmp, parm, 1);
|
||
rmem = adjust_address_nv (tmp, inner, 0);
|
||
imem = adjust_address_nv (tmp, inner, GET_MODE_SIZE (inner));
|
||
push_to_sequence (all->conversion_insns);
|
||
emit_move_insn (rmem, real);
|
||
emit_move_insn (imem, imag);
|
||
all->conversion_insns = get_insns ();
|
||
end_sequence ();
|
||
}
|
||
else
|
||
tmp = gen_rtx_CONCAT (DECL_MODE (parm), real, imag);
|
||
SET_DECL_RTL (parm, tmp);
|
||
|
||
real = DECL_INCOMING_RTL (fnargs);
|
||
imag = DECL_INCOMING_RTL (TREE_CHAIN (fnargs));
|
||
if (inner != GET_MODE (real))
|
||
{
|
||
real = gen_lowpart_SUBREG (inner, real);
|
||
imag = gen_lowpart_SUBREG (inner, imag);
|
||
}
|
||
tmp = gen_rtx_CONCAT (DECL_MODE (parm), real, imag);
|
||
set_decl_incoming_rtl (parm, tmp);
|
||
fnargs = TREE_CHAIN (fnargs);
|
||
}
|
||
else
|
||
{
|
||
SET_DECL_RTL (parm, DECL_RTL (fnargs));
|
||
set_decl_incoming_rtl (parm, DECL_INCOMING_RTL (fnargs));
|
||
|
||
/* Set MEM_EXPR to the original decl, i.e. to PARM,
|
||
instead of the copy of decl, i.e. FNARGS. */
|
||
if (DECL_INCOMING_RTL (parm) && MEM_P (DECL_INCOMING_RTL (parm)))
|
||
set_mem_expr (DECL_INCOMING_RTL (parm), parm);
|
||
}
|
||
|
||
fnargs = TREE_CHAIN (fnargs);
|
||
}
|
||
}
|
||
|
||
/* Assign RTL expressions to the function's parameters. This may involve
|
||
copying them into registers and using those registers as the DECL_RTL. */
|
||
|
||
static void
|
||
assign_parms (tree fndecl)
|
||
{
|
||
struct assign_parm_data_all all;
|
||
tree fnargs, parm;
|
||
|
||
current_function_internal_arg_pointer
|
||
= targetm.calls.internal_arg_pointer ();
|
||
|
||
assign_parms_initialize_all (&all);
|
||
fnargs = assign_parms_augmented_arg_list (&all);
|
||
|
||
for (parm = fnargs; parm; parm = TREE_CHAIN (parm))
|
||
{
|
||
struct assign_parm_data_one data;
|
||
|
||
/* Extract the type of PARM; adjust it according to ABI. */
|
||
assign_parm_find_data_types (&all, parm, &data);
|
||
|
||
/* Early out for errors and void parameters. */
|
||
if (data.passed_mode == VOIDmode)
|
||
{
|
||
SET_DECL_RTL (parm, const0_rtx);
|
||
DECL_INCOMING_RTL (parm) = DECL_RTL (parm);
|
||
continue;
|
||
}
|
||
|
||
if (current_function_stdarg && !TREE_CHAIN (parm))
|
||
assign_parms_setup_varargs (&all, &data, false);
|
||
|
||
/* Find out where the parameter arrives in this function. */
|
||
assign_parm_find_entry_rtl (&all, &data);
|
||
|
||
/* Find out where stack space for this parameter might be. */
|
||
if (assign_parm_is_stack_parm (&all, &data))
|
||
{
|
||
assign_parm_find_stack_rtl (parm, &data);
|
||
assign_parm_adjust_entry_rtl (&data);
|
||
}
|
||
|
||
/* Record permanently how this parm was passed. */
|
||
set_decl_incoming_rtl (parm, data.entry_parm);
|
||
|
||
/* Update info on where next arg arrives in registers. */
|
||
FUNCTION_ARG_ADVANCE (all.args_so_far, data.promoted_mode,
|
||
data.passed_type, data.named_arg);
|
||
|
||
assign_parm_adjust_stack_rtl (&data);
|
||
|
||
if (assign_parm_setup_block_p (&data))
|
||
assign_parm_setup_block (&all, parm, &data);
|
||
else if (data.passed_pointer || use_register_for_decl (parm))
|
||
assign_parm_setup_reg (&all, parm, &data);
|
||
else
|
||
assign_parm_setup_stack (&all, parm, &data);
|
||
}
|
||
|
||
if (targetm.calls.split_complex_arg && fnargs != all.orig_fnargs)
|
||
assign_parms_unsplit_complex (&all, fnargs);
|
||
|
||
/* Output all parameter conversion instructions (possibly including calls)
|
||
now that all parameters have been copied out of hard registers. */
|
||
emit_insn (all.conversion_insns);
|
||
|
||
/* If we are receiving a struct value address as the first argument, set up
|
||
the RTL for the function result. As this might require code to convert
|
||
the transmitted address to Pmode, we do this here to ensure that possible
|
||
preliminary conversions of the address have been emitted already. */
|
||
if (all.function_result_decl)
|
||
{
|
||
tree result = DECL_RESULT (current_function_decl);
|
||
rtx addr = DECL_RTL (all.function_result_decl);
|
||
rtx x;
|
||
|
||
if (DECL_BY_REFERENCE (result))
|
||
x = addr;
|
||
else
|
||
{
|
||
addr = convert_memory_address (Pmode, addr);
|
||
x = gen_rtx_MEM (DECL_MODE (result), addr);
|
||
set_mem_attributes (x, result, 1);
|
||
}
|
||
SET_DECL_RTL (result, x);
|
||
}
|
||
|
||
/* We have aligned all the args, so add space for the pretend args. */
|
||
current_function_pretend_args_size = all.pretend_args_size;
|
||
all.stack_args_size.constant += all.extra_pretend_bytes;
|
||
current_function_args_size = all.stack_args_size.constant;
|
||
|
||
/* Adjust function incoming argument size for alignment and
|
||
minimum length. */
|
||
|
||
#ifdef REG_PARM_STACK_SPACE
|
||
current_function_args_size = MAX (current_function_args_size,
|
||
REG_PARM_STACK_SPACE (fndecl));
|
||
#endif
|
||
|
||
current_function_args_size = CEIL_ROUND (current_function_args_size,
|
||
PARM_BOUNDARY / BITS_PER_UNIT);
|
||
|
||
#ifdef ARGS_GROW_DOWNWARD
|
||
current_function_arg_offset_rtx
|
||
= (all.stack_args_size.var == 0 ? GEN_INT (-all.stack_args_size.constant)
|
||
: expand_expr (size_diffop (all.stack_args_size.var,
|
||
size_int (-all.stack_args_size.constant)),
|
||
NULL_RTX, VOIDmode, 0));
|
||
#else
|
||
current_function_arg_offset_rtx = ARGS_SIZE_RTX (all.stack_args_size);
|
||
#endif
|
||
|
||
/* See how many bytes, if any, of its args a function should try to pop
|
||
on return. */
|
||
|
||
current_function_pops_args = RETURN_POPS_ARGS (fndecl, TREE_TYPE (fndecl),
|
||
current_function_args_size);
|
||
|
||
/* For stdarg.h function, save info about
|
||
regs and stack space used by the named args. */
|
||
|
||
current_function_args_info = all.args_so_far;
|
||
|
||
/* Set the rtx used for the function return value. Put this in its
|
||
own variable so any optimizers that need this information don't have
|
||
to include tree.h. Do this here so it gets done when an inlined
|
||
function gets output. */
|
||
|
||
current_function_return_rtx
|
||
= (DECL_RTL_SET_P (DECL_RESULT (fndecl))
|
||
? DECL_RTL (DECL_RESULT (fndecl)) : NULL_RTX);
|
||
|
||
/* If scalar return value was computed in a pseudo-reg, or was a named
|
||
return value that got dumped to the stack, copy that to the hard
|
||
return register. */
|
||
if (DECL_RTL_SET_P (DECL_RESULT (fndecl)))
|
||
{
|
||
tree decl_result = DECL_RESULT (fndecl);
|
||
rtx decl_rtl = DECL_RTL (decl_result);
|
||
|
||
if (REG_P (decl_rtl)
|
||
? REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER
|
||
: DECL_REGISTER (decl_result))
|
||
{
|
||
rtx real_decl_rtl;
|
||
|
||
real_decl_rtl = targetm.calls.function_value (TREE_TYPE (decl_result),
|
||
fndecl, true);
|
||
REG_FUNCTION_VALUE_P (real_decl_rtl) = 1;
|
||
/* The delay slot scheduler assumes that current_function_return_rtx
|
||
holds the hard register containing the return value, not a
|
||
temporary pseudo. */
|
||
current_function_return_rtx = real_decl_rtl;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* A subroutine of gimplify_parameters, invoked via walk_tree.
|
||
For all seen types, gimplify their sizes. */
|
||
|
||
static tree
|
||
gimplify_parm_type (tree *tp, int *walk_subtrees, void *data)
|
||
{
|
||
tree t = *tp;
|
||
|
||
*walk_subtrees = 0;
|
||
if (TYPE_P (t))
|
||
{
|
||
if (POINTER_TYPE_P (t))
|
||
*walk_subtrees = 1;
|
||
else if (TYPE_SIZE (t) && !TREE_CONSTANT (TYPE_SIZE (t))
|
||
&& !TYPE_SIZES_GIMPLIFIED (t))
|
||
{
|
||
gimplify_type_sizes (t, (tree *) data);
|
||
*walk_subtrees = 1;
|
||
}
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Gimplify the parameter list for current_function_decl. This involves
|
||
evaluating SAVE_EXPRs of variable sized parameters and generating code
|
||
to implement callee-copies reference parameters. Returns a list of
|
||
statements to add to the beginning of the function, or NULL if nothing
|
||
to do. */
|
||
|
||
tree
|
||
gimplify_parameters (void)
|
||
{
|
||
struct assign_parm_data_all all;
|
||
tree fnargs, parm, stmts = NULL;
|
||
|
||
assign_parms_initialize_all (&all);
|
||
fnargs = assign_parms_augmented_arg_list (&all);
|
||
|
||
for (parm = fnargs; parm; parm = TREE_CHAIN (parm))
|
||
{
|
||
struct assign_parm_data_one data;
|
||
|
||
/* Extract the type of PARM; adjust it according to ABI. */
|
||
assign_parm_find_data_types (&all, parm, &data);
|
||
|
||
/* Early out for errors and void parameters. */
|
||
if (data.passed_mode == VOIDmode || DECL_SIZE (parm) == NULL)
|
||
continue;
|
||
|
||
/* Update info on where next arg arrives in registers. */
|
||
FUNCTION_ARG_ADVANCE (all.args_so_far, data.promoted_mode,
|
||
data.passed_type, data.named_arg);
|
||
|
||
/* ??? Once upon a time variable_size stuffed parameter list
|
||
SAVE_EXPRs (amongst others) onto a pending sizes list. This
|
||
turned out to be less than manageable in the gimple world.
|
||
Now we have to hunt them down ourselves. */
|
||
walk_tree_without_duplicates (&data.passed_type,
|
||
gimplify_parm_type, &stmts);
|
||
|
||
if (!TREE_CONSTANT (DECL_SIZE (parm)))
|
||
{
|
||
gimplify_one_sizepos (&DECL_SIZE (parm), &stmts);
|
||
gimplify_one_sizepos (&DECL_SIZE_UNIT (parm), &stmts);
|
||
}
|
||
|
||
if (data.passed_pointer)
|
||
{
|
||
tree type = TREE_TYPE (data.passed_type);
|
||
if (reference_callee_copied (&all.args_so_far, TYPE_MODE (type),
|
||
type, data.named_arg))
|
||
{
|
||
tree local, t;
|
||
|
||
/* For constant sized objects, this is trivial; for
|
||
variable-sized objects, we have to play games. */
|
||
if (TREE_CONSTANT (DECL_SIZE (parm)))
|
||
{
|
||
local = create_tmp_var (type, get_name (parm));
|
||
DECL_IGNORED_P (local) = 0;
|
||
}
|
||
else
|
||
{
|
||
tree ptr_type, addr, args;
|
||
|
||
ptr_type = build_pointer_type (type);
|
||
addr = create_tmp_var (ptr_type, get_name (parm));
|
||
DECL_IGNORED_P (addr) = 0;
|
||
local = build_fold_indirect_ref (addr);
|
||
|
||
args = tree_cons (NULL, DECL_SIZE_UNIT (parm), NULL);
|
||
t = built_in_decls[BUILT_IN_ALLOCA];
|
||
t = build_function_call_expr (t, args);
|
||
t = fold_convert (ptr_type, t);
|
||
t = build2 (MODIFY_EXPR, void_type_node, addr, t);
|
||
gimplify_and_add (t, &stmts);
|
||
}
|
||
|
||
t = build2 (MODIFY_EXPR, void_type_node, local, parm);
|
||
gimplify_and_add (t, &stmts);
|
||
|
||
SET_DECL_VALUE_EXPR (parm, local);
|
||
DECL_HAS_VALUE_EXPR_P (parm) = 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
return stmts;
|
||
}
|
||
|
||
/* Indicate whether REGNO is an incoming argument to the current function
|
||
that was promoted to a wider mode. If so, return the RTX for the
|
||
register (to get its mode). PMODE and PUNSIGNEDP are set to the mode
|
||
that REGNO is promoted from and whether the promotion was signed or
|
||
unsigned. */
|
||
|
||
rtx
|
||
promoted_input_arg (unsigned int regno, enum machine_mode *pmode, int *punsignedp)
|
||
{
|
||
tree arg;
|
||
|
||
for (arg = DECL_ARGUMENTS (current_function_decl); arg;
|
||
arg = TREE_CHAIN (arg))
|
||
if (REG_P (DECL_INCOMING_RTL (arg))
|
||
&& REGNO (DECL_INCOMING_RTL (arg)) == regno
|
||
&& TYPE_MODE (DECL_ARG_TYPE (arg)) == TYPE_MODE (TREE_TYPE (arg)))
|
||
{
|
||
enum machine_mode mode = TYPE_MODE (TREE_TYPE (arg));
|
||
int unsignedp = TYPE_UNSIGNED (TREE_TYPE (arg));
|
||
|
||
mode = promote_mode (TREE_TYPE (arg), mode, &unsignedp, 1);
|
||
if (mode == GET_MODE (DECL_INCOMING_RTL (arg))
|
||
&& mode != DECL_MODE (arg))
|
||
{
|
||
*pmode = DECL_MODE (arg);
|
||
*punsignedp = unsignedp;
|
||
return DECL_INCOMING_RTL (arg);
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Compute the size and offset from the start of the stacked arguments for a
|
||
parm passed in mode PASSED_MODE and with type TYPE.
|
||
|
||
INITIAL_OFFSET_PTR points to the current offset into the stacked
|
||
arguments.
|
||
|
||
The starting offset and size for this parm are returned in
|
||
LOCATE->OFFSET and LOCATE->SIZE, respectively. When IN_REGS is
|
||
nonzero, the offset is that of stack slot, which is returned in
|
||
LOCATE->SLOT_OFFSET. LOCATE->ALIGNMENT_PAD is the amount of
|
||
padding required from the initial offset ptr to the stack slot.
|
||
|
||
IN_REGS is nonzero if the argument will be passed in registers. It will
|
||
never be set if REG_PARM_STACK_SPACE is not defined.
|
||
|
||
FNDECL is the function in which the argument was defined.
|
||
|
||
There are two types of rounding that are done. The first, controlled by
|
||
FUNCTION_ARG_BOUNDARY, forces the offset from the start of the argument
|
||
list to be aligned to the specific boundary (in bits). This rounding
|
||
affects the initial and starting offsets, but not the argument size.
|
||
|
||
The second, controlled by FUNCTION_ARG_PADDING and PARM_BOUNDARY,
|
||
optionally rounds the size of the parm to PARM_BOUNDARY. The
|
||
initial offset is not affected by this rounding, while the size always
|
||
is and the starting offset may be. */
|
||
|
||
/* LOCATE->OFFSET will be negative for ARGS_GROW_DOWNWARD case;
|
||
INITIAL_OFFSET_PTR is positive because locate_and_pad_parm's
|
||
callers pass in the total size of args so far as
|
||
INITIAL_OFFSET_PTR. LOCATE->SIZE is always positive. */
|
||
|
||
void
|
||
locate_and_pad_parm (enum machine_mode passed_mode, tree type, int in_regs,
|
||
int partial, tree fndecl ATTRIBUTE_UNUSED,
|
||
struct args_size *initial_offset_ptr,
|
||
struct locate_and_pad_arg_data *locate)
|
||
{
|
||
tree sizetree;
|
||
enum direction where_pad;
|
||
unsigned int boundary;
|
||
int reg_parm_stack_space = 0;
|
||
int part_size_in_regs;
|
||
|
||
#ifdef REG_PARM_STACK_SPACE
|
||
reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
|
||
|
||
/* If we have found a stack parm before we reach the end of the
|
||
area reserved for registers, skip that area. */
|
||
if (! in_regs)
|
||
{
|
||
if (reg_parm_stack_space > 0)
|
||
{
|
||
if (initial_offset_ptr->var)
|
||
{
|
||
initial_offset_ptr->var
|
||
= size_binop (MAX_EXPR, ARGS_SIZE_TREE (*initial_offset_ptr),
|
||
ssize_int (reg_parm_stack_space));
|
||
initial_offset_ptr->constant = 0;
|
||
}
|
||
else if (initial_offset_ptr->constant < reg_parm_stack_space)
|
||
initial_offset_ptr->constant = reg_parm_stack_space;
|
||
}
|
||
}
|
||
#endif /* REG_PARM_STACK_SPACE */
|
||
|
||
part_size_in_regs = (reg_parm_stack_space == 0 ? partial : 0);
|
||
|
||
sizetree
|
||
= type ? size_in_bytes (type) : size_int (GET_MODE_SIZE (passed_mode));
|
||
where_pad = FUNCTION_ARG_PADDING (passed_mode, type);
|
||
boundary = FUNCTION_ARG_BOUNDARY (passed_mode, type);
|
||
locate->where_pad = where_pad;
|
||
locate->boundary = boundary;
|
||
|
||
/* Remember if the outgoing parameter requires extra alignment on the
|
||
calling function side. */
|
||
if (boundary > PREFERRED_STACK_BOUNDARY)
|
||
boundary = PREFERRED_STACK_BOUNDARY;
|
||
if (cfun->stack_alignment_needed < boundary)
|
||
cfun->stack_alignment_needed = boundary;
|
||
|
||
#ifdef ARGS_GROW_DOWNWARD
|
||
locate->slot_offset.constant = -initial_offset_ptr->constant;
|
||
if (initial_offset_ptr->var)
|
||
locate->slot_offset.var = size_binop (MINUS_EXPR, ssize_int (0),
|
||
initial_offset_ptr->var);
|
||
|
||
{
|
||
tree s2 = sizetree;
|
||
if (where_pad != none
|
||
&& (!host_integerp (sizetree, 1)
|
||
|| (tree_low_cst (sizetree, 1) * BITS_PER_UNIT) % PARM_BOUNDARY))
|
||
s2 = round_up (s2, PARM_BOUNDARY / BITS_PER_UNIT);
|
||
SUB_PARM_SIZE (locate->slot_offset, s2);
|
||
}
|
||
|
||
locate->slot_offset.constant += part_size_in_regs;
|
||
|
||
if (!in_regs
|
||
#ifdef REG_PARM_STACK_SPACE
|
||
|| REG_PARM_STACK_SPACE (fndecl) > 0
|
||
#endif
|
||
)
|
||
pad_to_arg_alignment (&locate->slot_offset, boundary,
|
||
&locate->alignment_pad);
|
||
|
||
locate->size.constant = (-initial_offset_ptr->constant
|
||
- locate->slot_offset.constant);
|
||
if (initial_offset_ptr->var)
|
||
locate->size.var = size_binop (MINUS_EXPR,
|
||
size_binop (MINUS_EXPR,
|
||
ssize_int (0),
|
||
initial_offset_ptr->var),
|
||
locate->slot_offset.var);
|
||
|
||
/* Pad_below needs the pre-rounded size to know how much to pad
|
||
below. */
|
||
locate->offset = locate->slot_offset;
|
||
if (where_pad == downward)
|
||
pad_below (&locate->offset, passed_mode, sizetree);
|
||
|
||
#else /* !ARGS_GROW_DOWNWARD */
|
||
if (!in_regs
|
||
#ifdef REG_PARM_STACK_SPACE
|
||
|| REG_PARM_STACK_SPACE (fndecl) > 0
|
||
#endif
|
||
)
|
||
pad_to_arg_alignment (initial_offset_ptr, boundary,
|
||
&locate->alignment_pad);
|
||
locate->slot_offset = *initial_offset_ptr;
|
||
|
||
#ifdef PUSH_ROUNDING
|
||
if (passed_mode != BLKmode)
|
||
sizetree = size_int (PUSH_ROUNDING (TREE_INT_CST_LOW (sizetree)));
|
||
#endif
|
||
|
||
/* Pad_below needs the pre-rounded size to know how much to pad below
|
||
so this must be done before rounding up. */
|
||
locate->offset = locate->slot_offset;
|
||
if (where_pad == downward)
|
||
pad_below (&locate->offset, passed_mode, sizetree);
|
||
|
||
if (where_pad != none
|
||
&& (!host_integerp (sizetree, 1)
|
||
|| (tree_low_cst (sizetree, 1) * BITS_PER_UNIT) % PARM_BOUNDARY))
|
||
sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT);
|
||
|
||
ADD_PARM_SIZE (locate->size, sizetree);
|
||
|
||
locate->size.constant -= part_size_in_regs;
|
||
#endif /* ARGS_GROW_DOWNWARD */
|
||
}
|
||
|
||
/* Round the stack offset in *OFFSET_PTR up to a multiple of BOUNDARY.
|
||
BOUNDARY is measured in bits, but must be a multiple of a storage unit. */
|
||
|
||
static void
|
||
pad_to_arg_alignment (struct args_size *offset_ptr, int boundary,
|
||
struct args_size *alignment_pad)
|
||
{
|
||
tree save_var = NULL_TREE;
|
||
HOST_WIDE_INT save_constant = 0;
|
||
int boundary_in_bytes = boundary / BITS_PER_UNIT;
|
||
HOST_WIDE_INT sp_offset = STACK_POINTER_OFFSET;
|
||
|
||
#ifdef SPARC_STACK_BOUNDARY_HACK
|
||
/* ??? The SPARC port may claim a STACK_BOUNDARY higher than
|
||
the real alignment of %sp. However, when it does this, the
|
||
alignment of %sp+STACK_POINTER_OFFSET is STACK_BOUNDARY. */
|
||
if (SPARC_STACK_BOUNDARY_HACK)
|
||
sp_offset = 0;
|
||
#endif
|
||
|
||
if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY)
|
||
{
|
||
save_var = offset_ptr->var;
|
||
save_constant = offset_ptr->constant;
|
||
}
|
||
|
||
alignment_pad->var = NULL_TREE;
|
||
alignment_pad->constant = 0;
|
||
|
||
if (boundary > BITS_PER_UNIT)
|
||
{
|
||
if (offset_ptr->var)
|
||
{
|
||
tree sp_offset_tree = ssize_int (sp_offset);
|
||
tree offset = size_binop (PLUS_EXPR,
|
||
ARGS_SIZE_TREE (*offset_ptr),
|
||
sp_offset_tree);
|
||
#ifdef ARGS_GROW_DOWNWARD
|
||
tree rounded = round_down (offset, boundary / BITS_PER_UNIT);
|
||
#else
|
||
tree rounded = round_up (offset, boundary / BITS_PER_UNIT);
|
||
#endif
|
||
|
||
offset_ptr->var = size_binop (MINUS_EXPR, rounded, sp_offset_tree);
|
||
/* ARGS_SIZE_TREE includes constant term. */
|
||
offset_ptr->constant = 0;
|
||
if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY)
|
||
alignment_pad->var = size_binop (MINUS_EXPR, offset_ptr->var,
|
||
save_var);
|
||
}
|
||
else
|
||
{
|
||
offset_ptr->constant = -sp_offset +
|
||
#ifdef ARGS_GROW_DOWNWARD
|
||
FLOOR_ROUND (offset_ptr->constant + sp_offset, boundary_in_bytes);
|
||
#else
|
||
CEIL_ROUND (offset_ptr->constant + sp_offset, boundary_in_bytes);
|
||
#endif
|
||
if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY)
|
||
alignment_pad->constant = offset_ptr->constant - save_constant;
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
pad_below (struct args_size *offset_ptr, enum machine_mode passed_mode, tree sizetree)
|
||
{
|
||
if (passed_mode != BLKmode)
|
||
{
|
||
if (GET_MODE_BITSIZE (passed_mode) % PARM_BOUNDARY)
|
||
offset_ptr->constant
|
||
+= (((GET_MODE_BITSIZE (passed_mode) + PARM_BOUNDARY - 1)
|
||
/ PARM_BOUNDARY * PARM_BOUNDARY / BITS_PER_UNIT)
|
||
- GET_MODE_SIZE (passed_mode));
|
||
}
|
||
else
|
||
{
|
||
if (TREE_CODE (sizetree) != INTEGER_CST
|
||
|| (TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY)
|
||
{
|
||
/* Round the size up to multiple of PARM_BOUNDARY bits. */
|
||
tree s2 = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT);
|
||
/* Add it in. */
|
||
ADD_PARM_SIZE (*offset_ptr, s2);
|
||
SUB_PARM_SIZE (*offset_ptr, sizetree);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Walk the tree of blocks describing the binding levels within a function
|
||
and warn about variables the might be killed by setjmp or vfork.
|
||
This is done after calling flow_analysis and before global_alloc
|
||
clobbers the pseudo-regs to hard regs. */
|
||
|
||
void
|
||
setjmp_vars_warning (tree block)
|
||
{
|
||
tree decl, sub;
|
||
|
||
for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl))
|
||
{
|
||
if (TREE_CODE (decl) == VAR_DECL
|
||
&& DECL_RTL_SET_P (decl)
|
||
&& REG_P (DECL_RTL (decl))
|
||
&& regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl))))
|
||
warning (0, "variable %q+D might be clobbered by %<longjmp%>"
|
||
" or %<vfork%>",
|
||
decl);
|
||
}
|
||
|
||
for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub))
|
||
setjmp_vars_warning (sub);
|
||
}
|
||
|
||
/* Do the appropriate part of setjmp_vars_warning
|
||
but for arguments instead of local variables. */
|
||
|
||
void
|
||
setjmp_args_warning (void)
|
||
{
|
||
tree decl;
|
||
for (decl = DECL_ARGUMENTS (current_function_decl);
|
||
decl; decl = TREE_CHAIN (decl))
|
||
if (DECL_RTL (decl) != 0
|
||
&& REG_P (DECL_RTL (decl))
|
||
&& regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl))))
|
||
warning (0, "argument %q+D might be clobbered by %<longjmp%> or %<vfork%>",
|
||
decl);
|
||
}
|
||
|
||
|
||
/* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
|
||
and create duplicate blocks. */
|
||
/* ??? Need an option to either create block fragments or to create
|
||
abstract origin duplicates of a source block. It really depends
|
||
on what optimization has been performed. */
|
||
|
||
void
|
||
reorder_blocks (void)
|
||
{
|
||
tree block = DECL_INITIAL (current_function_decl);
|
||
VEC(tree,heap) *block_stack;
|
||
|
||
if (block == NULL_TREE)
|
||
return;
|
||
|
||
block_stack = VEC_alloc (tree, heap, 10);
|
||
|
||
/* Reset the TREE_ASM_WRITTEN bit for all blocks. */
|
||
clear_block_marks (block);
|
||
|
||
/* Prune the old trees away, so that they don't get in the way. */
|
||
BLOCK_SUBBLOCKS (block) = NULL_TREE;
|
||
BLOCK_CHAIN (block) = NULL_TREE;
|
||
|
||
/* Recreate the block tree from the note nesting. */
|
||
reorder_blocks_1 (get_insns (), block, &block_stack);
|
||
BLOCK_SUBBLOCKS (block) = blocks_nreverse (BLOCK_SUBBLOCKS (block));
|
||
|
||
VEC_free (tree, heap, block_stack);
|
||
}
|
||
|
||
/* Helper function for reorder_blocks. Reset TREE_ASM_WRITTEN. */
|
||
|
||
void
|
||
clear_block_marks (tree block)
|
||
{
|
||
while (block)
|
||
{
|
||
TREE_ASM_WRITTEN (block) = 0;
|
||
clear_block_marks (BLOCK_SUBBLOCKS (block));
|
||
block = BLOCK_CHAIN (block);
|
||
}
|
||
}
|
||
|
||
static void
|
||
reorder_blocks_1 (rtx insns, tree current_block, VEC(tree,heap) **p_block_stack)
|
||
{
|
||
rtx insn;
|
||
|
||
for (insn = insns; insn; insn = NEXT_INSN (insn))
|
||
{
|
||
if (NOTE_P (insn))
|
||
{
|
||
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG)
|
||
{
|
||
tree block = NOTE_BLOCK (insn);
|
||
tree origin;
|
||
|
||
origin = (BLOCK_FRAGMENT_ORIGIN (block)
|
||
? BLOCK_FRAGMENT_ORIGIN (block)
|
||
: block);
|
||
|
||
/* If we have seen this block before, that means it now
|
||
spans multiple address regions. Create a new fragment. */
|
||
if (TREE_ASM_WRITTEN (block))
|
||
{
|
||
tree new_block = copy_node (block);
|
||
|
||
BLOCK_FRAGMENT_ORIGIN (new_block) = origin;
|
||
BLOCK_FRAGMENT_CHAIN (new_block)
|
||
= BLOCK_FRAGMENT_CHAIN (origin);
|
||
BLOCK_FRAGMENT_CHAIN (origin) = new_block;
|
||
|
||
NOTE_BLOCK (insn) = new_block;
|
||
block = new_block;
|
||
}
|
||
|
||
BLOCK_SUBBLOCKS (block) = 0;
|
||
TREE_ASM_WRITTEN (block) = 1;
|
||
/* When there's only one block for the entire function,
|
||
current_block == block and we mustn't do this, it
|
||
will cause infinite recursion. */
|
||
if (block != current_block)
|
||
{
|
||
if (block != origin)
|
||
gcc_assert (BLOCK_SUPERCONTEXT (origin) == current_block);
|
||
|
||
BLOCK_SUPERCONTEXT (block) = current_block;
|
||
BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (current_block);
|
||
BLOCK_SUBBLOCKS (current_block) = block;
|
||
current_block = origin;
|
||
}
|
||
VEC_safe_push (tree, heap, *p_block_stack, block);
|
||
}
|
||
else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END)
|
||
{
|
||
NOTE_BLOCK (insn) = VEC_pop (tree, *p_block_stack);
|
||
BLOCK_SUBBLOCKS (current_block)
|
||
= blocks_nreverse (BLOCK_SUBBLOCKS (current_block));
|
||
current_block = BLOCK_SUPERCONTEXT (current_block);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Reverse the order of elements in the chain T of blocks,
|
||
and return the new head of the chain (old last element). */
|
||
|
||
tree
|
||
blocks_nreverse (tree t)
|
||
{
|
||
tree prev = 0, decl, next;
|
||
for (decl = t; decl; decl = next)
|
||
{
|
||
next = BLOCK_CHAIN (decl);
|
||
BLOCK_CHAIN (decl) = prev;
|
||
prev = decl;
|
||
}
|
||
return prev;
|
||
}
|
||
|
||
/* Count the subblocks of the list starting with BLOCK. If VECTOR is
|
||
non-NULL, list them all into VECTOR, in a depth-first preorder
|
||
traversal of the block tree. Also clear TREE_ASM_WRITTEN in all
|
||
blocks. */
|
||
|
||
static int
|
||
all_blocks (tree block, tree *vector)
|
||
{
|
||
int n_blocks = 0;
|
||
|
||
while (block)
|
||
{
|
||
TREE_ASM_WRITTEN (block) = 0;
|
||
|
||
/* Record this block. */
|
||
if (vector)
|
||
vector[n_blocks] = block;
|
||
|
||
++n_blocks;
|
||
|
||
/* Record the subblocks, and their subblocks... */
|
||
n_blocks += all_blocks (BLOCK_SUBBLOCKS (block),
|
||
vector ? vector + n_blocks : 0);
|
||
block = BLOCK_CHAIN (block);
|
||
}
|
||
|
||
return n_blocks;
|
||
}
|
||
|
||
/* Return a vector containing all the blocks rooted at BLOCK. The
|
||
number of elements in the vector is stored in N_BLOCKS_P. The
|
||
vector is dynamically allocated; it is the caller's responsibility
|
||
to call `free' on the pointer returned. */
|
||
|
||
static tree *
|
||
get_block_vector (tree block, int *n_blocks_p)
|
||
{
|
||
tree *block_vector;
|
||
|
||
*n_blocks_p = all_blocks (block, NULL);
|
||
block_vector = XNEWVEC (tree, *n_blocks_p);
|
||
all_blocks (block, block_vector);
|
||
|
||
return block_vector;
|
||
}
|
||
|
||
static GTY(()) int next_block_index = 2;
|
||
|
||
/* Set BLOCK_NUMBER for all the blocks in FN. */
|
||
|
||
void
|
||
number_blocks (tree fn)
|
||
{
|
||
int i;
|
||
int n_blocks;
|
||
tree *block_vector;
|
||
|
||
/* For SDB and XCOFF debugging output, we start numbering the blocks
|
||
from 1 within each function, rather than keeping a running
|
||
count. */
|
||
#if defined (SDB_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
|
||
if (write_symbols == SDB_DEBUG || write_symbols == XCOFF_DEBUG)
|
||
next_block_index = 1;
|
||
#endif
|
||
|
||
block_vector = get_block_vector (DECL_INITIAL (fn), &n_blocks);
|
||
|
||
/* The top-level BLOCK isn't numbered at all. */
|
||
for (i = 1; i < n_blocks; ++i)
|
||
/* We number the blocks from two. */
|
||
BLOCK_NUMBER (block_vector[i]) = next_block_index++;
|
||
|
||
free (block_vector);
|
||
|
||
return;
|
||
}
|
||
|
||
/* If VAR is present in a subblock of BLOCK, return the subblock. */
|
||
|
||
tree
|
||
debug_find_var_in_block_tree (tree var, tree block)
|
||
{
|
||
tree t;
|
||
|
||
for (t = BLOCK_VARS (block); t; t = TREE_CHAIN (t))
|
||
if (t == var)
|
||
return block;
|
||
|
||
for (t = BLOCK_SUBBLOCKS (block); t; t = TREE_CHAIN (t))
|
||
{
|
||
tree ret = debug_find_var_in_block_tree (var, t);
|
||
if (ret)
|
||
return ret;
|
||
}
|
||
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Allocate a function structure for FNDECL and set its contents
|
||
to the defaults. */
|
||
|
||
void
|
||
allocate_struct_function (tree fndecl)
|
||
{
|
||
tree result;
|
||
tree fntype = fndecl ? TREE_TYPE (fndecl) : NULL_TREE;
|
||
|
||
cfun = ggc_alloc_cleared (sizeof (struct function));
|
||
|
||
cfun->stack_alignment_needed = STACK_BOUNDARY;
|
||
cfun->preferred_stack_boundary = STACK_BOUNDARY;
|
||
|
||
current_function_funcdef_no = funcdef_no++;
|
||
|
||
cfun->function_frequency = FUNCTION_FREQUENCY_NORMAL;
|
||
|
||
init_eh_for_function ();
|
||
|
||
lang_hooks.function.init (cfun);
|
||
if (init_machine_status)
|
||
cfun->machine = (*init_machine_status) ();
|
||
|
||
if (fndecl == NULL)
|
||
return;
|
||
|
||
DECL_STRUCT_FUNCTION (fndecl) = cfun;
|
||
cfun->decl = fndecl;
|
||
|
||
result = DECL_RESULT (fndecl);
|
||
if (aggregate_value_p (result, fndecl))
|
||
{
|
||
#ifdef PCC_STATIC_STRUCT_RETURN
|
||
current_function_returns_pcc_struct = 1;
|
||
#endif
|
||
current_function_returns_struct = 1;
|
||
}
|
||
|
||
current_function_returns_pointer = POINTER_TYPE_P (TREE_TYPE (result));
|
||
|
||
current_function_stdarg
|
||
= (fntype
|
||
&& TYPE_ARG_TYPES (fntype) != 0
|
||
&& (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
|
||
!= void_type_node));
|
||
|
||
/* Assume all registers in stdarg functions need to be saved. */
|
||
cfun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE;
|
||
cfun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE;
|
||
}
|
||
|
||
/* Reset cfun, and other non-struct-function variables to defaults as
|
||
appropriate for emitting rtl at the start of a function. */
|
||
|
||
static void
|
||
prepare_function_start (tree fndecl)
|
||
{
|
||
if (fndecl && DECL_STRUCT_FUNCTION (fndecl))
|
||
cfun = DECL_STRUCT_FUNCTION (fndecl);
|
||
else
|
||
allocate_struct_function (fndecl);
|
||
init_emit ();
|
||
init_varasm_status (cfun);
|
||
init_expr ();
|
||
|
||
cse_not_expected = ! optimize;
|
||
|
||
/* Caller save not needed yet. */
|
||
caller_save_needed = 0;
|
||
|
||
/* We haven't done register allocation yet. */
|
||
reg_renumber = 0;
|
||
|
||
/* Indicate that we have not instantiated virtual registers yet. */
|
||
virtuals_instantiated = 0;
|
||
|
||
/* Indicate that we want CONCATs now. */
|
||
generating_concat_p = 1;
|
||
|
||
/* Indicate we have no need of a frame pointer yet. */
|
||
frame_pointer_needed = 0;
|
||
}
|
||
|
||
/* Initialize the rtl expansion mechanism so that we can do simple things
|
||
like generate sequences. This is used to provide a context during global
|
||
initialization of some passes. */
|
||
void
|
||
init_dummy_function_start (void)
|
||
{
|
||
prepare_function_start (NULL);
|
||
}
|
||
|
||
/* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node)
|
||
and initialize static variables for generating RTL for the statements
|
||
of the function. */
|
||
|
||
void
|
||
init_function_start (tree subr)
|
||
{
|
||
prepare_function_start (subr);
|
||
|
||
/* Prevent ever trying to delete the first instruction of a
|
||
function. Also tell final how to output a linenum before the
|
||
function prologue. Note linenums could be missing, e.g. when
|
||
compiling a Java .class file. */
|
||
if (! DECL_IS_BUILTIN (subr))
|
||
emit_line_note (DECL_SOURCE_LOCATION (subr));
|
||
|
||
/* Make sure first insn is a note even if we don't want linenums.
|
||
This makes sure the first insn will never be deleted.
|
||
Also, final expects a note to appear there. */
|
||
emit_note (NOTE_INSN_DELETED);
|
||
|
||
/* Warn if this value is an aggregate type,
|
||
regardless of which calling convention we are using for it. */
|
||
if (AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr))))
|
||
warning (OPT_Waggregate_return, "function returns an aggregate");
|
||
}
|
||
|
||
/* Make sure all values used by the optimization passes have sane
|
||
defaults. */
|
||
unsigned int
|
||
init_function_for_compilation (void)
|
||
{
|
||
reg_renumber = 0;
|
||
|
||
/* No prologue/epilogue insns yet. Make sure that these vectors are
|
||
empty. */
|
||
gcc_assert (VEC_length (int, prologue) == 0);
|
||
gcc_assert (VEC_length (int, epilogue) == 0);
|
||
gcc_assert (VEC_length (int, sibcall_epilogue) == 0);
|
||
return 0;
|
||
}
|
||
|
||
struct tree_opt_pass pass_init_function =
|
||
{
|
||
NULL, /* name */
|
||
NULL, /* gate */
|
||
init_function_for_compilation, /* execute */
|
||
NULL, /* sub */
|
||
NULL, /* next */
|
||
0, /* static_pass_number */
|
||
0, /* tv_id */
|
||
0, /* properties_required */
|
||
0, /* properties_provided */
|
||
0, /* properties_destroyed */
|
||
0, /* todo_flags_start */
|
||
0, /* todo_flags_finish */
|
||
0 /* letter */
|
||
};
|
||
|
||
|
||
void
|
||
expand_main_function (void)
|
||
{
|
||
#if (defined(INVOKE__main) \
|
||
|| (!defined(HAS_INIT_SECTION) \
|
||
&& !defined(INIT_SECTION_ASM_OP) \
|
||
&& !defined(INIT_ARRAY_SECTION_ASM_OP)))
|
||
emit_library_call (init_one_libfunc (NAME__MAIN), LCT_NORMAL, VOIDmode, 0);
|
||
#endif
|
||
}
|
||
|
||
/* Expand code to initialize the stack_protect_guard. This is invoked at
|
||
the beginning of a function to be protected. */
|
||
|
||
#ifndef HAVE_stack_protect_set
|
||
# define HAVE_stack_protect_set 0
|
||
# define gen_stack_protect_set(x,y) (gcc_unreachable (), NULL_RTX)
|
||
#endif
|
||
|
||
void
|
||
stack_protect_prologue (void)
|
||
{
|
||
tree guard_decl = targetm.stack_protect_guard ();
|
||
rtx x, y;
|
||
|
||
/* Avoid expand_expr here, because we don't want guard_decl pulled
|
||
into registers unless absolutely necessary. And we know that
|
||
cfun->stack_protect_guard is a local stack slot, so this skips
|
||
all the fluff. */
|
||
x = validize_mem (DECL_RTL (cfun->stack_protect_guard));
|
||
y = validize_mem (DECL_RTL (guard_decl));
|
||
|
||
/* Allow the target to copy from Y to X without leaking Y into a
|
||
register. */
|
||
if (HAVE_stack_protect_set)
|
||
{
|
||
rtx insn = gen_stack_protect_set (x, y);
|
||
if (insn)
|
||
{
|
||
emit_insn (insn);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* Otherwise do a straight move. */
|
||
emit_move_insn (x, y);
|
||
}
|
||
|
||
/* Expand code to verify the stack_protect_guard. This is invoked at
|
||
the end of a function to be protected. */
|
||
|
||
#ifndef HAVE_stack_protect_test
|
||
# define HAVE_stack_protect_test 0
|
||
# define gen_stack_protect_test(x, y, z) (gcc_unreachable (), NULL_RTX)
|
||
#endif
|
||
|
||
void
|
||
stack_protect_epilogue (void)
|
||
{
|
||
tree guard_decl = targetm.stack_protect_guard ();
|
||
rtx label = gen_label_rtx ();
|
||
rtx x, y, tmp;
|
||
|
||
/* Avoid expand_expr here, because we don't want guard_decl pulled
|
||
into registers unless absolutely necessary. And we know that
|
||
cfun->stack_protect_guard is a local stack slot, so this skips
|
||
all the fluff. */
|
||
x = validize_mem (DECL_RTL (cfun->stack_protect_guard));
|
||
y = validize_mem (DECL_RTL (guard_decl));
|
||
|
||
/* Allow the target to compare Y with X without leaking either into
|
||
a register. */
|
||
switch (HAVE_stack_protect_test != 0)
|
||
{
|
||
case 1:
|
||
tmp = gen_stack_protect_test (x, y, label);
|
||
if (tmp)
|
||
{
|
||
emit_insn (tmp);
|
||
break;
|
||
}
|
||
/* FALLTHRU */
|
||
|
||
default:
|
||
emit_cmp_and_jump_insns (x, y, EQ, NULL_RTX, ptr_mode, 1, label);
|
||
break;
|
||
}
|
||
|
||
/* The noreturn predictor has been moved to the tree level. The rtl-level
|
||
predictors estimate this branch about 20%, which isn't enough to get
|
||
things moved out of line. Since this is the only extant case of adding
|
||
a noreturn function at the rtl level, it doesn't seem worth doing ought
|
||
except adding the prediction by hand. */
|
||
tmp = get_last_insn ();
|
||
if (JUMP_P (tmp))
|
||
predict_insn_def (tmp, PRED_NORETURN, TAKEN);
|
||
|
||
expand_expr_stmt (targetm.stack_protect_fail ());
|
||
emit_label (label);
|
||
}
|
||
|
||
/* Start the RTL for a new function, and set variables used for
|
||
emitting RTL.
|
||
SUBR is the FUNCTION_DECL node.
|
||
PARMS_HAVE_CLEANUPS is nonzero if there are cleanups associated with
|
||
the function's parameters, which must be run at any return statement. */
|
||
|
||
void
|
||
expand_function_start (tree subr)
|
||
{
|
||
/* Make sure volatile mem refs aren't considered
|
||
valid operands of arithmetic insns. */
|
||
init_recog_no_volatile ();
|
||
|
||
current_function_profile
|
||
= (profile_flag
|
||
&& ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr));
|
||
|
||
current_function_limit_stack
|
||
= (stack_limit_rtx != NULL_RTX && ! DECL_NO_LIMIT_STACK (subr));
|
||
|
||
/* Make the label for return statements to jump to. Do not special
|
||
case machines with special return instructions -- they will be
|
||
handled later during jump, ifcvt, or epilogue creation. */
|
||
return_label = gen_label_rtx ();
|
||
|
||
/* Initialize rtx used to return the value. */
|
||
/* Do this before assign_parms so that we copy the struct value address
|
||
before any library calls that assign parms might generate. */
|
||
|
||
/* Decide whether to return the value in memory or in a register. */
|
||
if (aggregate_value_p (DECL_RESULT (subr), subr))
|
||
{
|
||
/* Returning something that won't go in a register. */
|
||
rtx value_address = 0;
|
||
|
||
#ifdef PCC_STATIC_STRUCT_RETURN
|
||
if (current_function_returns_pcc_struct)
|
||
{
|
||
int size = int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr)));
|
||
value_address = assemble_static_space (size);
|
||
}
|
||
else
|
||
#endif
|
||
{
|
||
rtx sv = targetm.calls.struct_value_rtx (TREE_TYPE (subr), 2);
|
||
/* Expect to be passed the address of a place to store the value.
|
||
If it is passed as an argument, assign_parms will take care of
|
||
it. */
|
||
if (sv)
|
||
{
|
||
value_address = gen_reg_rtx (Pmode);
|
||
emit_move_insn (value_address, sv);
|
||
}
|
||
}
|
||
if (value_address)
|
||
{
|
||
rtx x = value_address;
|
||
if (!DECL_BY_REFERENCE (DECL_RESULT (subr)))
|
||
{
|
||
x = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), x);
|
||
set_mem_attributes (x, DECL_RESULT (subr), 1);
|
||
}
|
||
SET_DECL_RTL (DECL_RESULT (subr), x);
|
||
}
|
||
}
|
||
else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode)
|
||
/* If return mode is void, this decl rtl should not be used. */
|
||
SET_DECL_RTL (DECL_RESULT (subr), NULL_RTX);
|
||
else
|
||
{
|
||
/* Compute the return values into a pseudo reg, which we will copy
|
||
into the true return register after the cleanups are done. */
|
||
tree return_type = TREE_TYPE (DECL_RESULT (subr));
|
||
if (TYPE_MODE (return_type) != BLKmode
|
||
&& targetm.calls.return_in_msb (return_type))
|
||
/* expand_function_end will insert the appropriate padding in
|
||
this case. Use the return value's natural (unpadded) mode
|
||
within the function proper. */
|
||
SET_DECL_RTL (DECL_RESULT (subr),
|
||
gen_reg_rtx (TYPE_MODE (return_type)));
|
||
else
|
||
{
|
||
/* In order to figure out what mode to use for the pseudo, we
|
||
figure out what the mode of the eventual return register will
|
||
actually be, and use that. */
|
||
rtx hard_reg = hard_function_value (return_type, subr, 0, 1);
|
||
|
||
/* Structures that are returned in registers are not
|
||
aggregate_value_p, so we may see a PARALLEL or a REG. */
|
||
if (REG_P (hard_reg))
|
||
SET_DECL_RTL (DECL_RESULT (subr),
|
||
gen_reg_rtx (GET_MODE (hard_reg)));
|
||
else
|
||
{
|
||
gcc_assert (GET_CODE (hard_reg) == PARALLEL);
|
||
SET_DECL_RTL (DECL_RESULT (subr), gen_group_rtx (hard_reg));
|
||
}
|
||
}
|
||
|
||
/* Set DECL_REGISTER flag so that expand_function_end will copy the
|
||
result to the real return register(s). */
|
||
DECL_REGISTER (DECL_RESULT (subr)) = 1;
|
||
}
|
||
|
||
/* Initialize rtx for parameters and local variables.
|
||
In some cases this requires emitting insns. */
|
||
assign_parms (subr);
|
||
|
||
/* If function gets a static chain arg, store it. */
|
||
if (cfun->static_chain_decl)
|
||
{
|
||
tree parm = cfun->static_chain_decl;
|
||
rtx local = gen_reg_rtx (Pmode);
|
||
|
||
set_decl_incoming_rtl (parm, static_chain_incoming_rtx);
|
||
SET_DECL_RTL (parm, local);
|
||
mark_reg_pointer (local, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm))));
|
||
|
||
emit_move_insn (local, static_chain_incoming_rtx);
|
||
}
|
||
|
||
/* If the function receives a non-local goto, then store the
|
||
bits we need to restore the frame pointer. */
|
||
if (cfun->nonlocal_goto_save_area)
|
||
{
|
||
tree t_save;
|
||
rtx r_save;
|
||
|
||
/* ??? We need to do this save early. Unfortunately here is
|
||
before the frame variable gets declared. Help out... */
|
||
expand_var (TREE_OPERAND (cfun->nonlocal_goto_save_area, 0));
|
||
|
||
t_save = build4 (ARRAY_REF, ptr_type_node,
|
||
cfun->nonlocal_goto_save_area,
|
||
integer_zero_node, NULL_TREE, NULL_TREE);
|
||
r_save = expand_expr (t_save, NULL_RTX, VOIDmode, EXPAND_WRITE);
|
||
r_save = convert_memory_address (Pmode, r_save);
|
||
|
||
emit_move_insn (r_save, virtual_stack_vars_rtx);
|
||
update_nonlocal_goto_save_area ();
|
||
}
|
||
|
||
/* The following was moved from init_function_start.
|
||
The move is supposed to make sdb output more accurate. */
|
||
/* Indicate the beginning of the function body,
|
||
as opposed to parm setup. */
|
||
emit_note (NOTE_INSN_FUNCTION_BEG);
|
||
|
||
gcc_assert (NOTE_P (get_last_insn ()));
|
||
|
||
parm_birth_insn = get_last_insn ();
|
||
|
||
if (current_function_profile)
|
||
{
|
||
#ifdef PROFILE_HOOK
|
||
PROFILE_HOOK (current_function_funcdef_no);
|
||
#endif
|
||
}
|
||
|
||
/* After the display initializations is where the stack checking
|
||
probe should go. */
|
||
if(flag_stack_check)
|
||
stack_check_probe_note = emit_note (NOTE_INSN_DELETED);
|
||
|
||
/* Make sure there is a line number after the function entry setup code. */
|
||
force_next_line_note ();
|
||
}
|
||
|
||
/* Undo the effects of init_dummy_function_start. */
|
||
void
|
||
expand_dummy_function_end (void)
|
||
{
|
||
/* End any sequences that failed to be closed due to syntax errors. */
|
||
while (in_sequence_p ())
|
||
end_sequence ();
|
||
|
||
/* Outside function body, can't compute type's actual size
|
||
until next function's body starts. */
|
||
|
||
free_after_parsing (cfun);
|
||
free_after_compilation (cfun);
|
||
cfun = 0;
|
||
}
|
||
|
||
/* Call DOIT for each hard register used as a return value from
|
||
the current function. */
|
||
|
||
void
|
||
diddle_return_value (void (*doit) (rtx, void *), void *arg)
|
||
{
|
||
rtx outgoing = current_function_return_rtx;
|
||
|
||
if (! outgoing)
|
||
return;
|
||
|
||
if (REG_P (outgoing))
|
||
(*doit) (outgoing, arg);
|
||
else if (GET_CODE (outgoing) == PARALLEL)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < XVECLEN (outgoing, 0); i++)
|
||
{
|
||
rtx x = XEXP (XVECEXP (outgoing, 0, i), 0);
|
||
|
||
if (REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER)
|
||
(*doit) (x, arg);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
do_clobber_return_reg (rtx reg, void *arg ATTRIBUTE_UNUSED)
|
||
{
|
||
emit_insn (gen_rtx_CLOBBER (VOIDmode, reg));
|
||
}
|
||
|
||
void
|
||
clobber_return_register (void)
|
||
{
|
||
diddle_return_value (do_clobber_return_reg, NULL);
|
||
|
||
/* In case we do use pseudo to return value, clobber it too. */
|
||
if (DECL_RTL_SET_P (DECL_RESULT (current_function_decl)))
|
||
{
|
||
tree decl_result = DECL_RESULT (current_function_decl);
|
||
rtx decl_rtl = DECL_RTL (decl_result);
|
||
if (REG_P (decl_rtl) && REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER)
|
||
{
|
||
do_clobber_return_reg (decl_rtl, NULL);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
do_use_return_reg (rtx reg, void *arg ATTRIBUTE_UNUSED)
|
||
{
|
||
emit_insn (gen_rtx_USE (VOIDmode, reg));
|
||
}
|
||
|
||
static void
|
||
use_return_register (void)
|
||
{
|
||
diddle_return_value (do_use_return_reg, NULL);
|
||
}
|
||
|
||
/* Possibly warn about unused parameters. */
|
||
void
|
||
do_warn_unused_parameter (tree fn)
|
||
{
|
||
tree decl;
|
||
|
||
for (decl = DECL_ARGUMENTS (fn);
|
||
decl; decl = TREE_CHAIN (decl))
|
||
if (!TREE_USED (decl) && TREE_CODE (decl) == PARM_DECL
|
||
&& DECL_NAME (decl) && !DECL_ARTIFICIAL (decl))
|
||
warning (OPT_Wunused_parameter, "unused parameter %q+D", decl);
|
||
}
|
||
|
||
static GTY(()) rtx initial_trampoline;
|
||
|
||
/* Generate RTL for the end of the current function. */
|
||
|
||
void
|
||
expand_function_end (void)
|
||
{
|
||
rtx clobber_after;
|
||
|
||
/* If arg_pointer_save_area was referenced only from a nested
|
||
function, we will not have initialized it yet. Do that now. */
|
||
if (arg_pointer_save_area && ! cfun->arg_pointer_save_area_init)
|
||
get_arg_pointer_save_area (cfun);
|
||
|
||
/* If we are doing stack checking and this function makes calls,
|
||
do a stack probe at the start of the function to ensure we have enough
|
||
space for another stack frame. */
|
||
if (flag_stack_check && ! STACK_CHECK_BUILTIN)
|
||
{
|
||
rtx insn, seq;
|
||
|
||
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
|
||
if (CALL_P (insn))
|
||
{
|
||
start_sequence ();
|
||
probe_stack_range (STACK_CHECK_PROTECT,
|
||
GEN_INT (STACK_CHECK_MAX_FRAME_SIZE));
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
emit_insn_before (seq, stack_check_probe_note);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Possibly warn about unused parameters.
|
||
When frontend does unit-at-a-time, the warning is already
|
||
issued at finalization time. */
|
||
if (warn_unused_parameter
|
||
&& !lang_hooks.callgraph.expand_function)
|
||
do_warn_unused_parameter (current_function_decl);
|
||
|
||
/* End any sequences that failed to be closed due to syntax errors. */
|
||
while (in_sequence_p ())
|
||
end_sequence ();
|
||
|
||
clear_pending_stack_adjust ();
|
||
do_pending_stack_adjust ();
|
||
|
||
/* Mark the end of the function body.
|
||
If control reaches this insn, the function can drop through
|
||
without returning a value. */
|
||
emit_note (NOTE_INSN_FUNCTION_END);
|
||
|
||
/* Must mark the last line number note in the function, so that the test
|
||
coverage code can avoid counting the last line twice. This just tells
|
||
the code to ignore the immediately following line note, since there
|
||
already exists a copy of this note somewhere above. This line number
|
||
note is still needed for debugging though, so we can't delete it. */
|
||
if (flag_test_coverage)
|
||
emit_note (NOTE_INSN_REPEATED_LINE_NUMBER);
|
||
|
||
/* Output a linenumber for the end of the function.
|
||
SDB depends on this. */
|
||
force_next_line_note ();
|
||
emit_line_note (input_location);
|
||
|
||
/* Before the return label (if any), clobber the return
|
||
registers so that they are not propagated live to the rest of
|
||
the function. This can only happen with functions that drop
|
||
through; if there had been a return statement, there would
|
||
have either been a return rtx, or a jump to the return label.
|
||
|
||
We delay actual code generation after the current_function_value_rtx
|
||
is computed. */
|
||
clobber_after = get_last_insn ();
|
||
|
||
/* Output the label for the actual return from the function. */
|
||
emit_label (return_label);
|
||
|
||
#ifdef TARGET_PROFILER_EPILOGUE
|
||
if (current_function_profile && TARGET_PROFILER_EPILOGUE)
|
||
{
|
||
static rtx mexitcount_libfunc;
|
||
static int initialized;
|
||
|
||
if (!initialized)
|
||
{
|
||
mexitcount_libfunc = init_one_libfunc (".mexitcount");
|
||
initialized = 0;
|
||
}
|
||
emit_library_call (mexitcount_libfunc, LCT_NORMAL, VOIDmode, 0);
|
||
}
|
||
#endif
|
||
|
||
if (USING_SJLJ_EXCEPTIONS)
|
||
{
|
||
/* Let except.c know where it should emit the call to unregister
|
||
the function context for sjlj exceptions. */
|
||
if (flag_exceptions)
|
||
sjlj_emit_function_exit_after (get_last_insn ());
|
||
}
|
||
else
|
||
{
|
||
/* @@@ This is a kludge. We want to ensure that instructions that
|
||
may trap are not moved into the epilogue by scheduling, because
|
||
we don't always emit unwind information for the epilogue.
|
||
However, not all machine descriptions define a blockage insn, so
|
||
emit an ASM_INPUT to act as one. */
|
||
if (flag_non_call_exceptions)
|
||
emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
|
||
}
|
||
|
||
/* If this is an implementation of throw, do what's necessary to
|
||
communicate between __builtin_eh_return and the epilogue. */
|
||
expand_eh_return ();
|
||
|
||
/* If scalar return value was computed in a pseudo-reg, or was a named
|
||
return value that got dumped to the stack, copy that to the hard
|
||
return register. */
|
||
if (DECL_RTL_SET_P (DECL_RESULT (current_function_decl)))
|
||
{
|
||
tree decl_result = DECL_RESULT (current_function_decl);
|
||
rtx decl_rtl = DECL_RTL (decl_result);
|
||
|
||
if (REG_P (decl_rtl)
|
||
? REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER
|
||
: DECL_REGISTER (decl_result))
|
||
{
|
||
rtx real_decl_rtl = current_function_return_rtx;
|
||
|
||
/* This should be set in assign_parms. */
|
||
gcc_assert (REG_FUNCTION_VALUE_P (real_decl_rtl));
|
||
|
||
/* If this is a BLKmode structure being returned in registers,
|
||
then use the mode computed in expand_return. Note that if
|
||
decl_rtl is memory, then its mode may have been changed,
|
||
but that current_function_return_rtx has not. */
|
||
if (GET_MODE (real_decl_rtl) == BLKmode)
|
||
PUT_MODE (real_decl_rtl, GET_MODE (decl_rtl));
|
||
|
||
/* If a non-BLKmode return value should be padded at the least
|
||
significant end of the register, shift it left by the appropriate
|
||
amount. BLKmode results are handled using the group load/store
|
||
machinery. */
|
||
if (TYPE_MODE (TREE_TYPE (decl_result)) != BLKmode
|
||
&& targetm.calls.return_in_msb (TREE_TYPE (decl_result)))
|
||
{
|
||
emit_move_insn (gen_rtx_REG (GET_MODE (decl_rtl),
|
||
REGNO (real_decl_rtl)),
|
||
decl_rtl);
|
||
shift_return_value (GET_MODE (decl_rtl), true, real_decl_rtl);
|
||
}
|
||
/* If a named return value dumped decl_return to memory, then
|
||
we may need to re-do the PROMOTE_MODE signed/unsigned
|
||
extension. */
|
||
else if (GET_MODE (real_decl_rtl) != GET_MODE (decl_rtl))
|
||
{
|
||
int unsignedp = TYPE_UNSIGNED (TREE_TYPE (decl_result));
|
||
|
||
if (targetm.calls.promote_function_return (TREE_TYPE (current_function_decl)))
|
||
promote_mode (TREE_TYPE (decl_result), GET_MODE (decl_rtl),
|
||
&unsignedp, 1);
|
||
|
||
convert_move (real_decl_rtl, decl_rtl, unsignedp);
|
||
}
|
||
else if (GET_CODE (real_decl_rtl) == PARALLEL)
|
||
{
|
||
/* If expand_function_start has created a PARALLEL for decl_rtl,
|
||
move the result to the real return registers. Otherwise, do
|
||
a group load from decl_rtl for a named return. */
|
||
if (GET_CODE (decl_rtl) == PARALLEL)
|
||
emit_group_move (real_decl_rtl, decl_rtl);
|
||
else
|
||
emit_group_load (real_decl_rtl, decl_rtl,
|
||
TREE_TYPE (decl_result),
|
||
int_size_in_bytes (TREE_TYPE (decl_result)));
|
||
}
|
||
/* In the case of complex integer modes smaller than a word, we'll
|
||
need to generate some non-trivial bitfield insertions. Do that
|
||
on a pseudo and not the hard register. */
|
||
else if (GET_CODE (decl_rtl) == CONCAT
|
||
&& GET_MODE_CLASS (GET_MODE (decl_rtl)) == MODE_COMPLEX_INT
|
||
&& GET_MODE_BITSIZE (GET_MODE (decl_rtl)) <= BITS_PER_WORD)
|
||
{
|
||
int old_generating_concat_p;
|
||
rtx tmp;
|
||
|
||
old_generating_concat_p = generating_concat_p;
|
||
generating_concat_p = 0;
|
||
tmp = gen_reg_rtx (GET_MODE (decl_rtl));
|
||
generating_concat_p = old_generating_concat_p;
|
||
|
||
emit_move_insn (tmp, decl_rtl);
|
||
emit_move_insn (real_decl_rtl, tmp);
|
||
}
|
||
else
|
||
emit_move_insn (real_decl_rtl, decl_rtl);
|
||
}
|
||
}
|
||
|
||
/* If returning a structure, arrange to return the address of the value
|
||
in a place where debuggers expect to find it.
|
||
|
||
If returning a structure PCC style,
|
||
the caller also depends on this value.
|
||
And current_function_returns_pcc_struct is not necessarily set. */
|
||
if (current_function_returns_struct
|
||
|| current_function_returns_pcc_struct)
|
||
{
|
||
rtx value_address = DECL_RTL (DECL_RESULT (current_function_decl));
|
||
tree type = TREE_TYPE (DECL_RESULT (current_function_decl));
|
||
rtx outgoing;
|
||
|
||
if (DECL_BY_REFERENCE (DECL_RESULT (current_function_decl)))
|
||
type = TREE_TYPE (type);
|
||
else
|
||
value_address = XEXP (value_address, 0);
|
||
|
||
outgoing = targetm.calls.function_value (build_pointer_type (type),
|
||
current_function_decl, true);
|
||
|
||
/* Mark this as a function return value so integrate will delete the
|
||
assignment and USE below when inlining this function. */
|
||
REG_FUNCTION_VALUE_P (outgoing) = 1;
|
||
|
||
/* The address may be ptr_mode and OUTGOING may be Pmode. */
|
||
value_address = convert_memory_address (GET_MODE (outgoing),
|
||
value_address);
|
||
|
||
emit_move_insn (outgoing, value_address);
|
||
|
||
/* Show return register used to hold result (in this case the address
|
||
of the result. */
|
||
current_function_return_rtx = outgoing;
|
||
}
|
||
|
||
/* Emit the actual code to clobber return register. */
|
||
{
|
||
rtx seq;
|
||
|
||
start_sequence ();
|
||
clobber_return_register ();
|
||
expand_naked_return ();
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
emit_insn_after (seq, clobber_after);
|
||
}
|
||
|
||
/* Output the label for the naked return from the function. */
|
||
emit_label (naked_return_label);
|
||
|
||
/* If stack protection is enabled for this function, check the guard. */
|
||
if (cfun->stack_protect_guard)
|
||
stack_protect_epilogue ();
|
||
|
||
/* If we had calls to alloca, and this machine needs
|
||
an accurate stack pointer to exit the function,
|
||
insert some code to save and restore the stack pointer. */
|
||
if (! EXIT_IGNORE_STACK
|
||
&& current_function_calls_alloca)
|
||
{
|
||
rtx tem = 0;
|
||
|
||
emit_stack_save (SAVE_FUNCTION, &tem, parm_birth_insn);
|
||
emit_stack_restore (SAVE_FUNCTION, tem, NULL_RTX);
|
||
}
|
||
|
||
/* ??? This should no longer be necessary since stupid is no longer with
|
||
us, but there are some parts of the compiler (eg reload_combine, and
|
||
sh mach_dep_reorg) that still try and compute their own lifetime info
|
||
instead of using the general framework. */
|
||
use_return_register ();
|
||
}
|
||
|
||
rtx
|
||
get_arg_pointer_save_area (struct function *f)
|
||
{
|
||
rtx ret = f->x_arg_pointer_save_area;
|
||
|
||
if (! ret)
|
||
{
|
||
ret = assign_stack_local_1 (Pmode, GET_MODE_SIZE (Pmode), 0, f);
|
||
f->x_arg_pointer_save_area = ret;
|
||
}
|
||
|
||
if (f == cfun && ! f->arg_pointer_save_area_init)
|
||
{
|
||
rtx seq;
|
||
|
||
/* Save the arg pointer at the beginning of the function. The
|
||
generated stack slot may not be a valid memory address, so we
|
||
have to check it and fix it if necessary. */
|
||
start_sequence ();
|
||
emit_move_insn (validize_mem (ret), virtual_incoming_args_rtx);
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
push_topmost_sequence ();
|
||
emit_insn_after (seq, entry_of_function ());
|
||
pop_topmost_sequence ();
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Extend a vector that records the INSN_UIDs of INSNS
|
||
(a list of one or more insns). */
|
||
|
||
static void
|
||
record_insns (rtx insns, VEC(int,heap) **vecp)
|
||
{
|
||
rtx tmp;
|
||
|
||
for (tmp = insns; tmp != NULL_RTX; tmp = NEXT_INSN (tmp))
|
||
VEC_safe_push (int, heap, *vecp, INSN_UID (tmp));
|
||
}
|
||
|
||
/* Set the locator of the insn chain starting at INSN to LOC. */
|
||
static void
|
||
set_insn_locators (rtx insn, int loc)
|
||
{
|
||
while (insn != NULL_RTX)
|
||
{
|
||
if (INSN_P (insn))
|
||
INSN_LOCATOR (insn) = loc;
|
||
insn = NEXT_INSN (insn);
|
||
}
|
||
}
|
||
|
||
/* Determine how many INSN_UIDs in VEC are part of INSN. Because we can
|
||
be running after reorg, SEQUENCE rtl is possible. */
|
||
|
||
static int
|
||
contains (rtx insn, VEC(int,heap) **vec)
|
||
{
|
||
int i, j;
|
||
|
||
if (NONJUMP_INSN_P (insn)
|
||
&& GET_CODE (PATTERN (insn)) == SEQUENCE)
|
||
{
|
||
int count = 0;
|
||
for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--)
|
||
for (j = VEC_length (int, *vec) - 1; j >= 0; --j)
|
||
if (INSN_UID (XVECEXP (PATTERN (insn), 0, i))
|
||
== VEC_index (int, *vec, j))
|
||
count++;
|
||
return count;
|
||
}
|
||
else
|
||
{
|
||
for (j = VEC_length (int, *vec) - 1; j >= 0; --j)
|
||
if (INSN_UID (insn) == VEC_index (int, *vec, j))
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
prologue_epilogue_contains (rtx insn)
|
||
{
|
||
if (contains (insn, &prologue))
|
||
return 1;
|
||
if (contains (insn, &epilogue))
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
sibcall_epilogue_contains (rtx insn)
|
||
{
|
||
if (sibcall_epilogue)
|
||
return contains (insn, &sibcall_epilogue);
|
||
return 0;
|
||
}
|
||
|
||
#ifdef HAVE_return
|
||
/* Insert gen_return at the end of block BB. This also means updating
|
||
block_for_insn appropriately. */
|
||
|
||
static void
|
||
emit_return_into_block (basic_block bb, rtx line_note)
|
||
{
|
||
emit_jump_insn_after (gen_return (), BB_END (bb));
|
||
if (line_note)
|
||
emit_note_copy_after (line_note, PREV_INSN (BB_END (bb)));
|
||
}
|
||
#endif /* HAVE_return */
|
||
|
||
#if defined(HAVE_epilogue) && defined(INCOMING_RETURN_ADDR_RTX)
|
||
|
||
/* These functions convert the epilogue into a variant that does not
|
||
modify the stack pointer. This is used in cases where a function
|
||
returns an object whose size is not known until it is computed.
|
||
The called function leaves the object on the stack, leaves the
|
||
stack depressed, and returns a pointer to the object.
|
||
|
||
What we need to do is track all modifications and references to the
|
||
stack pointer, deleting the modifications and changing the
|
||
references to point to the location the stack pointer would have
|
||
pointed to had the modifications taken place.
|
||
|
||
These functions need to be portable so we need to make as few
|
||
assumptions about the epilogue as we can. However, the epilogue
|
||
basically contains three things: instructions to reset the stack
|
||
pointer, instructions to reload registers, possibly including the
|
||
frame pointer, and an instruction to return to the caller.
|
||
|
||
We must be sure of what a relevant epilogue insn is doing. We also
|
||
make no attempt to validate the insns we make since if they are
|
||
invalid, we probably can't do anything valid. The intent is that
|
||
these routines get "smarter" as more and more machines start to use
|
||
them and they try operating on different epilogues.
|
||
|
||
We use the following structure to track what the part of the
|
||
epilogue that we've already processed has done. We keep two copies
|
||
of the SP equivalence, one for use during the insn we are
|
||
processing and one for use in the next insn. The difference is
|
||
because one part of a PARALLEL may adjust SP and the other may use
|
||
it. */
|
||
|
||
struct epi_info
|
||
{
|
||
rtx sp_equiv_reg; /* REG that SP is set from, perhaps SP. */
|
||
HOST_WIDE_INT sp_offset; /* Offset from SP_EQUIV_REG of present SP. */
|
||
rtx new_sp_equiv_reg; /* REG to be used at end of insn. */
|
||
HOST_WIDE_INT new_sp_offset; /* Offset to be used at end of insn. */
|
||
rtx equiv_reg_src; /* If nonzero, the value that SP_EQUIV_REG
|
||
should be set to once we no longer need
|
||
its value. */
|
||
rtx const_equiv[FIRST_PSEUDO_REGISTER]; /* Any known constant equivalences
|
||
for registers. */
|
||
};
|
||
|
||
static void handle_epilogue_set (rtx, struct epi_info *);
|
||
static void update_epilogue_consts (rtx, rtx, void *);
|
||
static void emit_equiv_load (struct epi_info *);
|
||
|
||
/* Modify INSN, a list of one or more insns that is part of the epilogue, to
|
||
no modifications to the stack pointer. Return the new list of insns. */
|
||
|
||
static rtx
|
||
keep_stack_depressed (rtx insns)
|
||
{
|
||
int j;
|
||
struct epi_info info;
|
||
rtx insn, next;
|
||
|
||
/* If the epilogue is just a single instruction, it must be OK as is. */
|
||
if (NEXT_INSN (insns) == NULL_RTX)
|
||
return insns;
|
||
|
||
/* Otherwise, start a sequence, initialize the information we have, and
|
||
process all the insns we were given. */
|
||
start_sequence ();
|
||
|
||
info.sp_equiv_reg = stack_pointer_rtx;
|
||
info.sp_offset = 0;
|
||
info.equiv_reg_src = 0;
|
||
|
||
for (j = 0; j < FIRST_PSEUDO_REGISTER; j++)
|
||
info.const_equiv[j] = 0;
|
||
|
||
insn = insns;
|
||
next = NULL_RTX;
|
||
while (insn != NULL_RTX)
|
||
{
|
||
next = NEXT_INSN (insn);
|
||
|
||
if (!INSN_P (insn))
|
||
{
|
||
add_insn (insn);
|
||
insn = next;
|
||
continue;
|
||
}
|
||
|
||
/* If this insn references the register that SP is equivalent to and
|
||
we have a pending load to that register, we must force out the load
|
||
first and then indicate we no longer know what SP's equivalent is. */
|
||
if (info.equiv_reg_src != 0
|
||
&& reg_referenced_p (info.sp_equiv_reg, PATTERN (insn)))
|
||
{
|
||
emit_equiv_load (&info);
|
||
info.sp_equiv_reg = 0;
|
||
}
|
||
|
||
info.new_sp_equiv_reg = info.sp_equiv_reg;
|
||
info.new_sp_offset = info.sp_offset;
|
||
|
||
/* If this is a (RETURN) and the return address is on the stack,
|
||
update the address and change to an indirect jump. */
|
||
if (GET_CODE (PATTERN (insn)) == RETURN
|
||
|| (GET_CODE (PATTERN (insn)) == PARALLEL
|
||
&& GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == RETURN))
|
||
{
|
||
rtx retaddr = INCOMING_RETURN_ADDR_RTX;
|
||
rtx base = 0;
|
||
HOST_WIDE_INT offset = 0;
|
||
rtx jump_insn, jump_set;
|
||
|
||
/* If the return address is in a register, we can emit the insn
|
||
unchanged. Otherwise, it must be a MEM and we see what the
|
||
base register and offset are. In any case, we have to emit any
|
||
pending load to the equivalent reg of SP, if any. */
|
||
if (REG_P (retaddr))
|
||
{
|
||
emit_equiv_load (&info);
|
||
add_insn (insn);
|
||
insn = next;
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
rtx ret_ptr;
|
||
gcc_assert (MEM_P (retaddr));
|
||
|
||
ret_ptr = XEXP (retaddr, 0);
|
||
|
||
if (REG_P (ret_ptr))
|
||
{
|
||
base = gen_rtx_REG (Pmode, REGNO (ret_ptr));
|
||
offset = 0;
|
||
}
|
||
else
|
||
{
|
||
gcc_assert (GET_CODE (ret_ptr) == PLUS
|
||
&& REG_P (XEXP (ret_ptr, 0))
|
||
&& GET_CODE (XEXP (ret_ptr, 1)) == CONST_INT);
|
||
base = gen_rtx_REG (Pmode, REGNO (XEXP (ret_ptr, 0)));
|
||
offset = INTVAL (XEXP (ret_ptr, 1));
|
||
}
|
||
}
|
||
|
||
/* If the base of the location containing the return pointer
|
||
is SP, we must update it with the replacement address. Otherwise,
|
||
just build the necessary MEM. */
|
||
retaddr = plus_constant (base, offset);
|
||
if (base == stack_pointer_rtx)
|
||
retaddr = simplify_replace_rtx (retaddr, stack_pointer_rtx,
|
||
plus_constant (info.sp_equiv_reg,
|
||
info.sp_offset));
|
||
|
||
retaddr = gen_rtx_MEM (Pmode, retaddr);
|
||
MEM_NOTRAP_P (retaddr) = 1;
|
||
|
||
/* If there is a pending load to the equivalent register for SP
|
||
and we reference that register, we must load our address into
|
||
a scratch register and then do that load. */
|
||
if (info.equiv_reg_src
|
||
&& reg_overlap_mentioned_p (info.equiv_reg_src, retaddr))
|
||
{
|
||
unsigned int regno;
|
||
rtx reg;
|
||
|
||
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
||
if (HARD_REGNO_MODE_OK (regno, Pmode)
|
||
&& !fixed_regs[regno]
|
||
&& TEST_HARD_REG_BIT (regs_invalidated_by_call, regno)
|
||
&& !REGNO_REG_SET_P
|
||
(EXIT_BLOCK_PTR->il.rtl->global_live_at_start, regno)
|
||
&& !refers_to_regno_p (regno,
|
||
regno + hard_regno_nregs[regno]
|
||
[Pmode],
|
||
info.equiv_reg_src, NULL)
|
||
&& info.const_equiv[regno] == 0)
|
||
break;
|
||
|
||
gcc_assert (regno < FIRST_PSEUDO_REGISTER);
|
||
|
||
reg = gen_rtx_REG (Pmode, regno);
|
||
emit_move_insn (reg, retaddr);
|
||
retaddr = reg;
|
||
}
|
||
|
||
emit_equiv_load (&info);
|
||
jump_insn = emit_jump_insn (gen_indirect_jump (retaddr));
|
||
|
||
/* Show the SET in the above insn is a RETURN. */
|
||
jump_set = single_set (jump_insn);
|
||
gcc_assert (jump_set);
|
||
SET_IS_RETURN_P (jump_set) = 1;
|
||
}
|
||
|
||
/* If SP is not mentioned in the pattern and its equivalent register, if
|
||
any, is not modified, just emit it. Otherwise, if neither is set,
|
||
replace the reference to SP and emit the insn. If none of those are
|
||
true, handle each SET individually. */
|
||
else if (!reg_mentioned_p (stack_pointer_rtx, PATTERN (insn))
|
||
&& (info.sp_equiv_reg == stack_pointer_rtx
|
||
|| !reg_set_p (info.sp_equiv_reg, insn)))
|
||
add_insn (insn);
|
||
else if (! reg_set_p (stack_pointer_rtx, insn)
|
||
&& (info.sp_equiv_reg == stack_pointer_rtx
|
||
|| !reg_set_p (info.sp_equiv_reg, insn)))
|
||
{
|
||
int changed;
|
||
|
||
changed = validate_replace_rtx (stack_pointer_rtx,
|
||
plus_constant (info.sp_equiv_reg,
|
||
info.sp_offset),
|
||
insn);
|
||
gcc_assert (changed);
|
||
|
||
add_insn (insn);
|
||
}
|
||
else if (GET_CODE (PATTERN (insn)) == SET)
|
||
handle_epilogue_set (PATTERN (insn), &info);
|
||
else if (GET_CODE (PATTERN (insn)) == PARALLEL)
|
||
{
|
||
for (j = 0; j < XVECLEN (PATTERN (insn), 0); j++)
|
||
if (GET_CODE (XVECEXP (PATTERN (insn), 0, j)) == SET)
|
||
handle_epilogue_set (XVECEXP (PATTERN (insn), 0, j), &info);
|
||
}
|
||
else
|
||
add_insn (insn);
|
||
|
||
info.sp_equiv_reg = info.new_sp_equiv_reg;
|
||
info.sp_offset = info.new_sp_offset;
|
||
|
||
/* Now update any constants this insn sets. */
|
||
note_stores (PATTERN (insn), update_epilogue_consts, &info);
|
||
insn = next;
|
||
}
|
||
|
||
insns = get_insns ();
|
||
end_sequence ();
|
||
return insns;
|
||
}
|
||
|
||
/* SET is a SET from an insn in the epilogue. P is a pointer to the epi_info
|
||
structure that contains information about what we've seen so far. We
|
||
process this SET by either updating that data or by emitting one or
|
||
more insns. */
|
||
|
||
static void
|
||
handle_epilogue_set (rtx set, struct epi_info *p)
|
||
{
|
||
/* First handle the case where we are setting SP. Record what it is being
|
||
set from, which we must be able to determine */
|
||
if (reg_set_p (stack_pointer_rtx, set))
|
||
{
|
||
gcc_assert (SET_DEST (set) == stack_pointer_rtx);
|
||
|
||
if (GET_CODE (SET_SRC (set)) == PLUS)
|
||
{
|
||
p->new_sp_equiv_reg = XEXP (SET_SRC (set), 0);
|
||
if (GET_CODE (XEXP (SET_SRC (set), 1)) == CONST_INT)
|
||
p->new_sp_offset = INTVAL (XEXP (SET_SRC (set), 1));
|
||
else
|
||
{
|
||
gcc_assert (REG_P (XEXP (SET_SRC (set), 1))
|
||
&& (REGNO (XEXP (SET_SRC (set), 1))
|
||
< FIRST_PSEUDO_REGISTER)
|
||
&& p->const_equiv[REGNO (XEXP (SET_SRC (set), 1))]);
|
||
p->new_sp_offset
|
||
= INTVAL (p->const_equiv[REGNO (XEXP (SET_SRC (set), 1))]);
|
||
}
|
||
}
|
||
else
|
||
p->new_sp_equiv_reg = SET_SRC (set), p->new_sp_offset = 0;
|
||
|
||
/* If we are adjusting SP, we adjust from the old data. */
|
||
if (p->new_sp_equiv_reg == stack_pointer_rtx)
|
||
{
|
||
p->new_sp_equiv_reg = p->sp_equiv_reg;
|
||
p->new_sp_offset += p->sp_offset;
|
||
}
|
||
|
||
gcc_assert (p->new_sp_equiv_reg && REG_P (p->new_sp_equiv_reg));
|
||
|
||
return;
|
||
}
|
||
|
||
/* Next handle the case where we are setting SP's equivalent
|
||
register. We must not already have a value to set it to. We
|
||
could update, but there seems little point in handling that case.
|
||
Note that we have to allow for the case where we are setting the
|
||
register set in the previous part of a PARALLEL inside a single
|
||
insn. But use the old offset for any updates within this insn.
|
||
We must allow for the case where the register is being set in a
|
||
different (usually wider) mode than Pmode). */
|
||
else if (p->new_sp_equiv_reg != 0 && reg_set_p (p->new_sp_equiv_reg, set))
|
||
{
|
||
gcc_assert (!p->equiv_reg_src
|
||
&& REG_P (p->new_sp_equiv_reg)
|
||
&& REG_P (SET_DEST (set))
|
||
&& (GET_MODE_BITSIZE (GET_MODE (SET_DEST (set)))
|
||
<= BITS_PER_WORD)
|
||
&& REGNO (p->new_sp_equiv_reg) == REGNO (SET_DEST (set)));
|
||
p->equiv_reg_src
|
||
= simplify_replace_rtx (SET_SRC (set), stack_pointer_rtx,
|
||
plus_constant (p->sp_equiv_reg,
|
||
p->sp_offset));
|
||
}
|
||
|
||
/* Otherwise, replace any references to SP in the insn to its new value
|
||
and emit the insn. */
|
||
else
|
||
{
|
||
SET_SRC (set) = simplify_replace_rtx (SET_SRC (set), stack_pointer_rtx,
|
||
plus_constant (p->sp_equiv_reg,
|
||
p->sp_offset));
|
||
SET_DEST (set) = simplify_replace_rtx (SET_DEST (set), stack_pointer_rtx,
|
||
plus_constant (p->sp_equiv_reg,
|
||
p->sp_offset));
|
||
emit_insn (set);
|
||
}
|
||
}
|
||
|
||
/* Update the tracking information for registers set to constants. */
|
||
|
||
static void
|
||
update_epilogue_consts (rtx dest, rtx x, void *data)
|
||
{
|
||
struct epi_info *p = (struct epi_info *) data;
|
||
rtx new;
|
||
|
||
if (!REG_P (dest) || REGNO (dest) >= FIRST_PSEUDO_REGISTER)
|
||
return;
|
||
|
||
/* If we are either clobbering a register or doing a partial set,
|
||
show we don't know the value. */
|
||
else if (GET_CODE (x) == CLOBBER || ! rtx_equal_p (dest, SET_DEST (x)))
|
||
p->const_equiv[REGNO (dest)] = 0;
|
||
|
||
/* If we are setting it to a constant, record that constant. */
|
||
else if (GET_CODE (SET_SRC (x)) == CONST_INT)
|
||
p->const_equiv[REGNO (dest)] = SET_SRC (x);
|
||
|
||
/* If this is a binary operation between a register we have been tracking
|
||
and a constant, see if we can compute a new constant value. */
|
||
else if (ARITHMETIC_P (SET_SRC (x))
|
||
&& REG_P (XEXP (SET_SRC (x), 0))
|
||
&& REGNO (XEXP (SET_SRC (x), 0)) < FIRST_PSEUDO_REGISTER
|
||
&& p->const_equiv[REGNO (XEXP (SET_SRC (x), 0))] != 0
|
||
&& GET_CODE (XEXP (SET_SRC (x), 1)) == CONST_INT
|
||
&& 0 != (new = simplify_binary_operation
|
||
(GET_CODE (SET_SRC (x)), GET_MODE (dest),
|
||
p->const_equiv[REGNO (XEXP (SET_SRC (x), 0))],
|
||
XEXP (SET_SRC (x), 1)))
|
||
&& GET_CODE (new) == CONST_INT)
|
||
p->const_equiv[REGNO (dest)] = new;
|
||
|
||
/* Otherwise, we can't do anything with this value. */
|
||
else
|
||
p->const_equiv[REGNO (dest)] = 0;
|
||
}
|
||
|
||
/* Emit an insn to do the load shown in p->equiv_reg_src, if needed. */
|
||
|
||
static void
|
||
emit_equiv_load (struct epi_info *p)
|
||
{
|
||
if (p->equiv_reg_src != 0)
|
||
{
|
||
rtx dest = p->sp_equiv_reg;
|
||
|
||
if (GET_MODE (p->equiv_reg_src) != GET_MODE (dest))
|
||
dest = gen_rtx_REG (GET_MODE (p->equiv_reg_src),
|
||
REGNO (p->sp_equiv_reg));
|
||
|
||
emit_move_insn (dest, p->equiv_reg_src);
|
||
p->equiv_reg_src = 0;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
/* Generate the prologue and epilogue RTL if the machine supports it. Thread
|
||
this into place with notes indicating where the prologue ends and where
|
||
the epilogue begins. Update the basic block information when possible. */
|
||
|
||
void
|
||
thread_prologue_and_epilogue_insns (rtx f ATTRIBUTE_UNUSED)
|
||
{
|
||
int inserted = 0;
|
||
edge e;
|
||
#if defined (HAVE_sibcall_epilogue) || defined (HAVE_epilogue) || defined (HAVE_return) || defined (HAVE_prologue)
|
||
rtx seq;
|
||
#endif
|
||
#ifdef HAVE_prologue
|
||
rtx prologue_end = NULL_RTX;
|
||
#endif
|
||
#if defined (HAVE_epilogue) || defined(HAVE_return)
|
||
rtx epilogue_end = NULL_RTX;
|
||
#endif
|
||
edge_iterator ei;
|
||
|
||
#ifdef HAVE_prologue
|
||
if (HAVE_prologue)
|
||
{
|
||
start_sequence ();
|
||
seq = gen_prologue ();
|
||
emit_insn (seq);
|
||
|
||
/* Retain a map of the prologue insns. */
|
||
record_insns (seq, &prologue);
|
||
prologue_end = emit_note (NOTE_INSN_PROLOGUE_END);
|
||
|
||
#ifndef PROFILE_BEFORE_PROLOGUE
|
||
/* Ensure that instructions are not moved into the prologue when
|
||
profiling is on. The call to the profiling routine can be
|
||
emitted within the live range of a call-clobbered register. */
|
||
if (current_function_profile)
|
||
emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
|
||
#endif
|
||
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
set_insn_locators (seq, prologue_locator);
|
||
|
||
/* Can't deal with multiple successors of the entry block
|
||
at the moment. Function should always have at least one
|
||
entry point. */
|
||
gcc_assert (single_succ_p (ENTRY_BLOCK_PTR));
|
||
|
||
insert_insn_on_edge (seq, single_succ_edge (ENTRY_BLOCK_PTR));
|
||
inserted = 1;
|
||
}
|
||
#endif
|
||
|
||
/* If the exit block has no non-fake predecessors, we don't need
|
||
an epilogue. */
|
||
FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
|
||
if ((e->flags & EDGE_FAKE) == 0)
|
||
break;
|
||
if (e == NULL)
|
||
goto epilogue_done;
|
||
|
||
#ifdef HAVE_return
|
||
if (optimize && HAVE_return)
|
||
{
|
||
/* If we're allowed to generate a simple return instruction,
|
||
then by definition we don't need a full epilogue. Examine
|
||
the block that falls through to EXIT. If it does not
|
||
contain any code, examine its predecessors and try to
|
||
emit (conditional) return instructions. */
|
||
|
||
basic_block last;
|
||
rtx label;
|
||
|
||
FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
|
||
if (e->flags & EDGE_FALLTHRU)
|
||
break;
|
||
if (e == NULL)
|
||
goto epilogue_done;
|
||
last = e->src;
|
||
|
||
/* Verify that there are no active instructions in the last block. */
|
||
label = BB_END (last);
|
||
while (label && !LABEL_P (label))
|
||
{
|
||
if (active_insn_p (label))
|
||
break;
|
||
label = PREV_INSN (label);
|
||
}
|
||
|
||
if (BB_HEAD (last) == label && LABEL_P (label))
|
||
{
|
||
edge_iterator ei2;
|
||
rtx epilogue_line_note = NULL_RTX;
|
||
|
||
/* Locate the line number associated with the closing brace,
|
||
if we can find one. */
|
||
for (seq = get_last_insn ();
|
||
seq && ! active_insn_p (seq);
|
||
seq = PREV_INSN (seq))
|
||
if (NOTE_P (seq) && NOTE_LINE_NUMBER (seq) > 0)
|
||
{
|
||
epilogue_line_note = seq;
|
||
break;
|
||
}
|
||
|
||
for (ei2 = ei_start (last->preds); (e = ei_safe_edge (ei2)); )
|
||
{
|
||
basic_block bb = e->src;
|
||
rtx jump;
|
||
|
||
if (bb == ENTRY_BLOCK_PTR)
|
||
{
|
||
ei_next (&ei2);
|
||
continue;
|
||
}
|
||
|
||
jump = BB_END (bb);
|
||
if (!JUMP_P (jump) || JUMP_LABEL (jump) != label)
|
||
{
|
||
ei_next (&ei2);
|
||
continue;
|
||
}
|
||
|
||
/* If we have an unconditional jump, we can replace that
|
||
with a simple return instruction. */
|
||
if (simplejump_p (jump))
|
||
{
|
||
emit_return_into_block (bb, epilogue_line_note);
|
||
delete_insn (jump);
|
||
}
|
||
|
||
/* If we have a conditional jump, we can try to replace
|
||
that with a conditional return instruction. */
|
||
else if (condjump_p (jump))
|
||
{
|
||
if (! redirect_jump (jump, 0, 0))
|
||
{
|
||
ei_next (&ei2);
|
||
continue;
|
||
}
|
||
|
||
/* If this block has only one successor, it both jumps
|
||
and falls through to the fallthru block, so we can't
|
||
delete the edge. */
|
||
if (single_succ_p (bb))
|
||
{
|
||
ei_next (&ei2);
|
||
continue;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
ei_next (&ei2);
|
||
continue;
|
||
}
|
||
|
||
/* Fix up the CFG for the successful change we just made. */
|
||
redirect_edge_succ (e, EXIT_BLOCK_PTR);
|
||
}
|
||
|
||
/* Emit a return insn for the exit fallthru block. Whether
|
||
this is still reachable will be determined later. */
|
||
|
||
emit_barrier_after (BB_END (last));
|
||
emit_return_into_block (last, epilogue_line_note);
|
||
epilogue_end = BB_END (last);
|
||
single_succ_edge (last)->flags &= ~EDGE_FALLTHRU;
|
||
goto epilogue_done;
|
||
}
|
||
}
|
||
#endif
|
||
/* Find the edge that falls through to EXIT. Other edges may exist
|
||
due to RETURN instructions, but those don't need epilogues.
|
||
There really shouldn't be a mixture -- either all should have
|
||
been converted or none, however... */
|
||
|
||
FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
|
||
if (e->flags & EDGE_FALLTHRU)
|
||
break;
|
||
if (e == NULL)
|
||
goto epilogue_done;
|
||
|
||
#ifdef HAVE_epilogue
|
||
if (HAVE_epilogue)
|
||
{
|
||
start_sequence ();
|
||
epilogue_end = emit_note (NOTE_INSN_EPILOGUE_BEG);
|
||
|
||
seq = gen_epilogue ();
|
||
|
||
#ifdef INCOMING_RETURN_ADDR_RTX
|
||
/* If this function returns with the stack depressed and we can support
|
||
it, massage the epilogue to actually do that. */
|
||
if (TREE_CODE (TREE_TYPE (current_function_decl)) == FUNCTION_TYPE
|
||
&& TYPE_RETURNS_STACK_DEPRESSED (TREE_TYPE (current_function_decl)))
|
||
seq = keep_stack_depressed (seq);
|
||
#endif
|
||
|
||
emit_jump_insn (seq);
|
||
|
||
/* Retain a map of the epilogue insns. */
|
||
record_insns (seq, &epilogue);
|
||
set_insn_locators (seq, epilogue_locator);
|
||
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
insert_insn_on_edge (seq, e);
|
||
inserted = 1;
|
||
}
|
||
else
|
||
#endif
|
||
{
|
||
basic_block cur_bb;
|
||
|
||
if (! next_active_insn (BB_END (e->src)))
|
||
goto epilogue_done;
|
||
/* We have a fall-through edge to the exit block, the source is not
|
||
at the end of the function, and there will be an assembler epilogue
|
||
at the end of the function.
|
||
We can't use force_nonfallthru here, because that would try to
|
||
use return. Inserting a jump 'by hand' is extremely messy, so
|
||
we take advantage of cfg_layout_finalize using
|
||
fixup_fallthru_exit_predecessor. */
|
||
cfg_layout_initialize (0);
|
||
FOR_EACH_BB (cur_bb)
|
||
if (cur_bb->index >= NUM_FIXED_BLOCKS
|
||
&& cur_bb->next_bb->index >= NUM_FIXED_BLOCKS)
|
||
cur_bb->aux = cur_bb->next_bb;
|
||
cfg_layout_finalize ();
|
||
}
|
||
epilogue_done:
|
||
|
||
if (inserted)
|
||
commit_edge_insertions ();
|
||
|
||
#ifdef HAVE_sibcall_epilogue
|
||
/* Emit sibling epilogues before any sibling call sites. */
|
||
for (ei = ei_start (EXIT_BLOCK_PTR->preds); (e = ei_safe_edge (ei)); )
|
||
{
|
||
basic_block bb = e->src;
|
||
rtx insn = BB_END (bb);
|
||
|
||
if (!CALL_P (insn)
|
||
|| ! SIBLING_CALL_P (insn))
|
||
{
|
||
ei_next (&ei);
|
||
continue;
|
||
}
|
||
|
||
start_sequence ();
|
||
emit_insn (gen_sibcall_epilogue ());
|
||
seq = get_insns ();
|
||
end_sequence ();
|
||
|
||
/* Retain a map of the epilogue insns. Used in life analysis to
|
||
avoid getting rid of sibcall epilogue insns. Do this before we
|
||
actually emit the sequence. */
|
||
record_insns (seq, &sibcall_epilogue);
|
||
set_insn_locators (seq, epilogue_locator);
|
||
|
||
emit_insn_before (seq, insn);
|
||
ei_next (&ei);
|
||
}
|
||
#endif
|
||
|
||
#ifdef HAVE_prologue
|
||
/* This is probably all useless now that we use locators. */
|
||
if (prologue_end)
|
||
{
|
||
rtx insn, prev;
|
||
|
||
/* GDB handles `break f' by setting a breakpoint on the first
|
||
line note after the prologue. Which means (1) that if
|
||
there are line number notes before where we inserted the
|
||
prologue we should move them, and (2) we should generate a
|
||
note before the end of the first basic block, if there isn't
|
||
one already there.
|
||
|
||
??? This behavior is completely broken when dealing with
|
||
multiple entry functions. We simply place the note always
|
||
into first basic block and let alternate entry points
|
||
to be missed.
|
||
*/
|
||
|
||
for (insn = prologue_end; insn; insn = prev)
|
||
{
|
||
prev = PREV_INSN (insn);
|
||
if (NOTE_P (insn) && NOTE_LINE_NUMBER (insn) > 0)
|
||
{
|
||
/* Note that we cannot reorder the first insn in the
|
||
chain, since rest_of_compilation relies on that
|
||
remaining constant. */
|
||
if (prev == NULL)
|
||
break;
|
||
reorder_insns (insn, insn, prologue_end);
|
||
}
|
||
}
|
||
|
||
/* Find the last line number note in the first block. */
|
||
for (insn = BB_END (ENTRY_BLOCK_PTR->next_bb);
|
||
insn != prologue_end && insn;
|
||
insn = PREV_INSN (insn))
|
||
if (NOTE_P (insn) && NOTE_LINE_NUMBER (insn) > 0)
|
||
break;
|
||
|
||
/* If we didn't find one, make a copy of the first line number
|
||
we run across. */
|
||
if (! insn)
|
||
{
|
||
for (insn = next_active_insn (prologue_end);
|
||
insn;
|
||
insn = PREV_INSN (insn))
|
||
if (NOTE_P (insn) && NOTE_LINE_NUMBER (insn) > 0)
|
||
{
|
||
emit_note_copy_after (insn, prologue_end);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
#ifdef HAVE_epilogue
|
||
if (epilogue_end)
|
||
{
|
||
rtx insn, next;
|
||
|
||
/* Similarly, move any line notes that appear after the epilogue.
|
||
There is no need, however, to be quite so anal about the existence
|
||
of such a note. Also move the NOTE_INSN_FUNCTION_END and (possibly)
|
||
NOTE_INSN_FUNCTION_BEG notes, as those can be relevant for debug
|
||
info generation. */
|
||
for (insn = epilogue_end; insn; insn = next)
|
||
{
|
||
next = NEXT_INSN (insn);
|
||
if (NOTE_P (insn)
|
||
&& (NOTE_LINE_NUMBER (insn) > 0
|
||
|| NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_BEG
|
||
|| NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_END))
|
||
reorder_insns (insn, insn, PREV_INSN (epilogue_end));
|
||
}
|
||
}
|
||
#endif
|
||
}
|
||
|
||
/* Reposition the prologue-end and epilogue-begin notes after instruction
|
||
scheduling and delayed branch scheduling. */
|
||
|
||
void
|
||
reposition_prologue_and_epilogue_notes (rtx f ATTRIBUTE_UNUSED)
|
||
{
|
||
#if defined (HAVE_prologue) || defined (HAVE_epilogue)
|
||
rtx insn, last, note;
|
||
int len;
|
||
|
||
if ((len = VEC_length (int, prologue)) > 0)
|
||
{
|
||
last = 0, note = 0;
|
||
|
||
/* Scan from the beginning until we reach the last prologue insn.
|
||
We apparently can't depend on basic_block_{head,end} after
|
||
reorg has run. */
|
||
for (insn = f; insn; insn = NEXT_INSN (insn))
|
||
{
|
||
if (NOTE_P (insn))
|
||
{
|
||
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
|
||
note = insn;
|
||
}
|
||
else if (contains (insn, &prologue))
|
||
{
|
||
last = insn;
|
||
if (--len == 0)
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (last)
|
||
{
|
||
/* Find the prologue-end note if we haven't already, and
|
||
move it to just after the last prologue insn. */
|
||
if (note == 0)
|
||
{
|
||
for (note = last; (note = NEXT_INSN (note));)
|
||
if (NOTE_P (note)
|
||
&& NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END)
|
||
break;
|
||
}
|
||
|
||
/* Avoid placing note between CODE_LABEL and BASIC_BLOCK note. */
|
||
if (LABEL_P (last))
|
||
last = NEXT_INSN (last);
|
||
reorder_insns (note, note, last);
|
||
}
|
||
}
|
||
|
||
if ((len = VEC_length (int, epilogue)) > 0)
|
||
{
|
||
last = 0, note = 0;
|
||
|
||
/* Scan from the end until we reach the first epilogue insn.
|
||
We apparently can't depend on basic_block_{head,end} after
|
||
reorg has run. */
|
||
for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
|
||
{
|
||
if (NOTE_P (insn))
|
||
{
|
||
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG)
|
||
note = insn;
|
||
}
|
||
else if (contains (insn, &epilogue))
|
||
{
|
||
last = insn;
|
||
if (--len == 0)
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (last)
|
||
{
|
||
/* Find the epilogue-begin note if we haven't already, and
|
||
move it to just before the first epilogue insn. */
|
||
if (note == 0)
|
||
{
|
||
for (note = insn; (note = PREV_INSN (note));)
|
||
if (NOTE_P (note)
|
||
&& NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG)
|
||
break;
|
||
}
|
||
|
||
if (PREV_INSN (last) != note)
|
||
reorder_insns (note, note, PREV_INSN (last));
|
||
}
|
||
}
|
||
#endif /* HAVE_prologue or HAVE_epilogue */
|
||
}
|
||
|
||
/* Resets insn_block_boundaries array. */
|
||
|
||
void
|
||
reset_block_changes (void)
|
||
{
|
||
cfun->ib_boundaries_block = VEC_alloc (tree, gc, 100);
|
||
VEC_quick_push (tree, cfun->ib_boundaries_block, NULL_TREE);
|
||
}
|
||
|
||
/* Record the boundary for BLOCK. */
|
||
void
|
||
record_block_change (tree block)
|
||
{
|
||
int i, n;
|
||
tree last_block;
|
||
|
||
if (!block)
|
||
return;
|
||
|
||
if(!cfun->ib_boundaries_block)
|
||
return;
|
||
|
||
last_block = VEC_pop (tree, cfun->ib_boundaries_block);
|
||
n = get_max_uid ();
|
||
for (i = VEC_length (tree, cfun->ib_boundaries_block); i < n; i++)
|
||
VEC_safe_push (tree, gc, cfun->ib_boundaries_block, last_block);
|
||
|
||
VEC_safe_push (tree, gc, cfun->ib_boundaries_block, block);
|
||
}
|
||
|
||
/* Finishes record of boundaries. */
|
||
void
|
||
finalize_block_changes (void)
|
||
{
|
||
record_block_change (DECL_INITIAL (current_function_decl));
|
||
}
|
||
|
||
/* For INSN return the BLOCK it belongs to. */
|
||
void
|
||
check_block_change (rtx insn, tree *block)
|
||
{
|
||
unsigned uid = INSN_UID (insn);
|
||
|
||
if (uid >= VEC_length (tree, cfun->ib_boundaries_block))
|
||
return;
|
||
|
||
*block = VEC_index (tree, cfun->ib_boundaries_block, uid);
|
||
}
|
||
|
||
/* Releases the ib_boundaries_block records. */
|
||
void
|
||
free_block_changes (void)
|
||
{
|
||
VEC_free (tree, gc, cfun->ib_boundaries_block);
|
||
}
|
||
|
||
/* Returns the name of the current function. */
|
||
const char *
|
||
current_function_name (void)
|
||
{
|
||
return lang_hooks.decl_printable_name (cfun->decl, 2);
|
||
}
|
||
|
||
|
||
static unsigned int
|
||
rest_of_handle_check_leaf_regs (void)
|
||
{
|
||
#ifdef LEAF_REGISTERS
|
||
current_function_uses_only_leaf_regs
|
||
= optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
|
||
#endif
|
||
return 0;
|
||
}
|
||
|
||
/* Insert a TYPE into the used types hash table of CFUN. */
|
||
static void
|
||
used_types_insert_helper (tree type, struct function *func)
|
||
{
|
||
if (type != NULL && func != NULL)
|
||
{
|
||
void **slot;
|
||
|
||
if (func->used_types_hash == NULL)
|
||
func->used_types_hash = htab_create_ggc (37, htab_hash_pointer,
|
||
htab_eq_pointer, NULL);
|
||
slot = htab_find_slot (func->used_types_hash, type, INSERT);
|
||
if (*slot == NULL)
|
||
*slot = type;
|
||
}
|
||
}
|
||
|
||
/* Given a type, insert it into the used hash table in cfun. */
|
||
void
|
||
used_types_insert (tree t)
|
||
{
|
||
while (POINTER_TYPE_P (t) || TREE_CODE (t) == ARRAY_TYPE)
|
||
t = TREE_TYPE (t);
|
||
t = TYPE_MAIN_VARIANT (t);
|
||
if (debug_info_level > DINFO_LEVEL_NONE)
|
||
used_types_insert_helper (t, cfun);
|
||
}
|
||
|
||
struct tree_opt_pass pass_leaf_regs =
|
||
{
|
||
NULL, /* name */
|
||
NULL, /* gate */
|
||
rest_of_handle_check_leaf_regs, /* execute */
|
||
NULL, /* sub */
|
||
NULL, /* next */
|
||
0, /* static_pass_number */
|
||
0, /* tv_id */
|
||
0, /* properties_required */
|
||
0, /* properties_provided */
|
||
0, /* properties_destroyed */
|
||
0, /* todo_flags_start */
|
||
0, /* todo_flags_finish */
|
||
0 /* letter */
|
||
};
|
||
|
||
|
||
#include "gt-function.h"
|