647 lines
25 KiB
C
647 lines
25 KiB
C
/* Structure for saving state for a nested function.
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Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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1999, 2000, 2003, 2004 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifndef GCC_FUNCTION_H
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#define GCC_FUNCTION_H
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struct var_refs_queue GTY(())
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{
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rtx modified;
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enum machine_mode promoted_mode;
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int unsignedp;
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struct var_refs_queue *next;
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};
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/* Stack of pending (incomplete) sequences saved by `start_sequence'.
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Each element describes one pending sequence.
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The main insn-chain is saved in the last element of the chain,
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unless the chain is empty. */
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struct sequence_stack GTY(())
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{
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/* First and last insns in the chain of the saved sequence. */
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rtx first;
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rtx last;
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tree sequence_rtl_expr;
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struct sequence_stack *next;
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};
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extern struct sequence_stack *sequence_stack;
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/* Stack of single obstacks. */
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struct simple_obstack_stack
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{
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struct obstack *obstack;
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struct simple_obstack_stack *next;
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};
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struct emit_status GTY(())
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{
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/* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
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After rtl generation, it is 1 plus the largest register number used. */
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int x_reg_rtx_no;
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/* Lowest label number in current function. */
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int x_first_label_num;
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/* The ends of the doubly-linked chain of rtl for the current function.
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Both are reset to null at the start of rtl generation for the function.
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start_sequence saves both of these on `sequence_stack' along with
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`sequence_rtl_expr' and then starts a new, nested sequence of insns. */
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rtx x_first_insn;
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rtx x_last_insn;
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/* RTL_EXPR within which the current sequence will be placed. Use to
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prevent reuse of any temporaries within the sequence until after the
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RTL_EXPR is emitted. */
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tree sequence_rtl_expr;
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/* Stack of pending (incomplete) sequences saved by `start_sequence'.
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Each element describes one pending sequence.
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The main insn-chain is saved in the last element of the chain,
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unless the chain is empty. */
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struct sequence_stack *sequence_stack;
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/* INSN_UID for next insn emitted.
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Reset to 1 for each function compiled. */
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int x_cur_insn_uid;
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/* Location the last line-number NOTE emitted.
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This is used to avoid generating duplicates. */
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location_t x_last_location;
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/* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
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vectors. Since these vectors are needed during the expansion phase when
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the total number of registers in the function is not yet known, the
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vectors are copied and made bigger when necessary. */
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int regno_pointer_align_length;
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/* Indexed by pseudo register number, if nonzero gives the known alignment
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for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
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Allocated in parallel with x_regno_reg_rtx. */
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unsigned char * GTY ((length ("%h.x_reg_rtx_no")))
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regno_pointer_align;
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/* Indexed by pseudo register number, gives the rtx for that pseudo.
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Allocated in parallel with regno_pointer_align.
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Note MEM expressions can appear in this array due to the actions
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of put_var_into_stack. */
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rtx * GTY ((length ("%h.x_reg_rtx_no"))) x_regno_reg_rtx;
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};
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/* For backward compatibility... eventually these should all go away. */
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#define reg_rtx_no (cfun->emit->x_reg_rtx_no)
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#define seq_rtl_expr (cfun->emit->sequence_rtl_expr)
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#define regno_reg_rtx (cfun->emit->x_regno_reg_rtx)
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#define seq_stack (cfun->emit->sequence_stack)
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#define REGNO_POINTER_ALIGN(REGNO) (cfun->emit->regno_pointer_align[REGNO])
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struct expr_status GTY(())
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{
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/* Number of units that we should eventually pop off the stack.
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These are the arguments to function calls that have already returned. */
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int x_pending_stack_adjust;
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/* Under some ABIs, it is the caller's responsibility to pop arguments
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pushed for function calls. A naive implementation would simply pop
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the arguments immediately after each call. However, if several
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function calls are made in a row, it is typically cheaper to pop
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all the arguments after all of the calls are complete since a
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single pop instruction can be used. Therefore, GCC attempts to
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defer popping the arguments until absolutely necessary. (For
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example, at the end of a conditional, the arguments must be popped,
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since code outside the conditional won't know whether or not the
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arguments need to be popped.)
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When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
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attempt to defer pops. Instead, the stack is popped immediately
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after each call. Rather then setting this variable directly, use
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NO_DEFER_POP and OK_DEFER_POP. */
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int x_inhibit_defer_pop;
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/* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
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boundary can be momentarily unaligned while pushing the arguments.
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Record the delta since last aligned boundary here in order to get
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stack alignment in the nested function calls working right. */
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int x_stack_pointer_delta;
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/* Nonzero means __builtin_saveregs has already been done in this function.
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The value is the pseudoreg containing the value __builtin_saveregs
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returned. */
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rtx x_saveregs_value;
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/* Similarly for __builtin_apply_args. */
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rtx x_apply_args_value;
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/* List of labels that must never be deleted. */
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rtx x_forced_labels;
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/* Postincrements that still need to be expanded. */
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rtx x_pending_chain;
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};
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#define pending_stack_adjust (cfun->expr->x_pending_stack_adjust)
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#define inhibit_defer_pop (cfun->expr->x_inhibit_defer_pop)
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#define saveregs_value (cfun->expr->x_saveregs_value)
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#define apply_args_value (cfun->expr->x_apply_args_value)
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#define forced_labels (cfun->expr->x_forced_labels)
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#define pending_chain (cfun->expr->x_pending_chain)
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#define stack_pointer_delta (cfun->expr->x_stack_pointer_delta)
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/* This structure can save all the important global and static variables
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describing the status of the current function. */
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struct function GTY(())
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{
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struct eh_status *eh;
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struct stmt_status *stmt;
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struct expr_status *expr;
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struct emit_status *emit;
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struct varasm_status *varasm;
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/* For function.c. */
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/* Points to the FUNCTION_DECL of this function. */
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tree decl;
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/* Function containing this function, if any. */
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struct function *outer;
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/* Number of bytes of args popped by function being compiled on its return.
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Zero if no bytes are to be popped.
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May affect compilation of return insn or of function epilogue. */
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int pops_args;
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/* If function's args have a fixed size, this is that size, in bytes.
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Otherwise, it is -1.
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May affect compilation of return insn or of function epilogue. */
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int args_size;
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/* # bytes the prologue should push and pretend that the caller pushed them.
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The prologue must do this, but only if parms can be passed in
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registers. */
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int pretend_args_size;
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/* # of bytes of outgoing arguments. If ACCUMULATE_OUTGOING_ARGS is
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defined, the needed space is pushed by the prologue. */
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int outgoing_args_size;
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/* This is the offset from the arg pointer to the place where the first
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anonymous arg can be found, if there is one. */
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rtx arg_offset_rtx;
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/* Quantities of various kinds of registers
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used for the current function's args. */
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CUMULATIVE_ARGS args_info;
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/* If nonzero, an RTL expression for the location at which the current
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function returns its result. If the current function returns its
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result in a register, current_function_return_rtx will always be
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the hard register containing the result. */
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rtx return_rtx;
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/* The arg pointer hard register, or the pseudo into which it was copied. */
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rtx internal_arg_pointer;
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/* Language-specific reason why the current function cannot be made
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inline. */
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const char *cannot_inline;
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/* Opaque pointer used by get_hard_reg_initial_val and
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has_hard_reg_initial_val (see integrate.[hc]). */
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struct initial_value_struct *hard_reg_initial_vals;
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/* Number of function calls seen so far in current function. */
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int x_function_call_count;
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/* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
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(labels to which there can be nonlocal gotos from nested functions)
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in this function. */
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tree x_nonlocal_labels;
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/* List (chain of EXPR_LIST) of stack slots that hold the current handlers
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for nonlocal gotos. There is one for every nonlocal label in the
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function; this list matches the one in nonlocal_labels.
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Zero when function does not have nonlocal labels. */
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rtx x_nonlocal_goto_handler_slots;
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/* List (chain of EXPR_LIST) of labels heading the current handlers for
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nonlocal gotos. */
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rtx x_nonlocal_goto_handler_labels;
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/* RTX for stack slot that holds the stack pointer value to restore
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for a nonlocal goto.
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Zero when function does not have nonlocal labels. */
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rtx x_nonlocal_goto_stack_level;
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/* Label that will go on parm cleanup code, if any.
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Jumping to this label runs cleanup code for parameters, if
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such code must be run. Following this code is the logical return
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label. */
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rtx x_cleanup_label;
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/* Label that will go on function epilogue.
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Jumping to this label serves as a "return" instruction
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on machines which require execution of the epilogue on all returns. */
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rtx x_return_label;
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/* Label that will go on the end of function epilogue.
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Jumping to this label serves as a "naked return" instruction
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on machines which require execution of the epilogue on all returns. */
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rtx x_naked_return_label;
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/* Label and register for unswitching computed gotos. */
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rtx computed_goto_common_label;
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rtx computed_goto_common_reg;
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/* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
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So we can mark them all live at the end of the function, if nonopt. */
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rtx x_save_expr_regs;
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/* List (chain of EXPR_LISTs) of all stack slots in this function.
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Made for the sake of unshare_all_rtl. */
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rtx x_stack_slot_list;
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/* Chain of all RTL_EXPRs that have insns in them. */
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tree x_rtl_expr_chain;
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/* Label to jump back to for tail recursion, or 0 if we have
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not yet needed one for this function. */
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rtx x_tail_recursion_label;
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/* Place after which to insert the tail_recursion_label if we need one. */
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rtx x_tail_recursion_reentry;
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/* Location at which to save the argument pointer if it will need to be
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referenced. There are two cases where this is done: if nonlocal gotos
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exist, or if vars stored at an offset from the argument pointer will be
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needed by inner routines. */
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rtx x_arg_pointer_save_area;
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/* If the function returns non-void, we will emit a clobber of the
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return registers just in case the user fell off the end without
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returning a proper value. This is that insn. */
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rtx x_clobber_return_insn;
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/* Offset to end of allocated area of stack frame.
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If stack grows down, this is the address of the last stack slot allocated.
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If stack grows up, this is the address for the next slot. */
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HOST_WIDE_INT x_frame_offset;
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/* List (chain of TREE_LISTs) of static chains for containing functions.
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Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
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in an RTL_EXPR in the TREE_VALUE. */
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tree x_context_display;
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/* List (chain of TREE_LISTs) of trampolines for nested functions.
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The trampoline sets up the static chain and jumps to the function.
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We supply the trampoline's address when the function's address is
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requested.
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Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
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in an RTL_EXPR in the TREE_VALUE. */
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tree x_trampoline_list;
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/* Insn after which register parms and SAVE_EXPRs are born, if nonopt. */
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rtx x_parm_birth_insn;
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/* Last insn of those whose job was to put parms into their nominal
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homes. */
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rtx x_last_parm_insn;
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/* 1 + last pseudo register number possibly used for loading a copy
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of a parameter of this function. */
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unsigned int x_max_parm_reg;
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/* Vector indexed by REGNO, containing location on stack in which
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to put the parm which is nominally in pseudo register REGNO,
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if we discover that that parm must go in the stack. The highest
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element in this vector is one less than MAX_PARM_REG, above. */
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rtx * GTY ((length ("%h.x_max_parm_reg"))) x_parm_reg_stack_loc;
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/* List of all temporaries allocated, both available and in use. */
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struct temp_slot *x_temp_slots;
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/* Current nesting level for temporaries. */
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int x_temp_slot_level;
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/* Current nesting level for variables in a block. */
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int x_var_temp_slot_level;
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/* When temporaries are created by TARGET_EXPRs, they are created at
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this level of temp_slot_level, so that they can remain allocated
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until no longer needed. CLEANUP_POINT_EXPRs define the lifetime
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of TARGET_EXPRs. */
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int x_target_temp_slot_level;
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/* This slot is initialized as 0 and is added to
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during the nested function. */
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struct var_refs_queue *fixup_var_refs_queue;
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/* For integrate.c. */
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int inlinable;
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int no_debugging_symbols;
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rtvec original_arg_vector;
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tree original_decl_initial;
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/* Last insn of those whose job was to put parms into their nominal
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homes. */
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rtx inl_last_parm_insn;
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/* Highest label number in current function. */
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int inl_max_label_num;
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/* Function sequence number for profiling, debugging, etc. */
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int funcdef_no;
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/* For md files. */
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/* tm.h can use this to store whatever it likes. */
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struct machine_function * GTY ((maybe_undef (""))) machine;
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/* The largest alignment of slot allocated on the stack. */
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int stack_alignment_needed;
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/* Preferred alignment of the end of stack frame. */
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int preferred_stack_boundary;
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/* Set when the call to function itself has been emit. */
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bool recursive_call_emit;
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/* Language-specific code can use this to store whatever it likes. */
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struct language_function * language;
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/* For reorg. */
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/* If some insns can be deferred to the delay slots of the epilogue, the
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delay list for them is recorded here. */
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rtx epilogue_delay_list;
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/* How commonly executed the function is. Initialized during branch
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probabilities pass. */
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enum function_frequency {
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/* This function most likely won't be executed at all.
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(set only when profile feedback is available). */
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FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
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/* The default value. */
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FUNCTION_FREQUENCY_NORMAL,
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/* Optimize this function hard
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(set only when profile feedback is available). */
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FUNCTION_FREQUENCY_HOT
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} function_frequency;
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/* Maximal number of entities in the single jumptable. Used to estimate
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final flowgraph size. */
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int max_jumptable_ents;
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/* Collected bit flags. */
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/* Nonzero if function being compiled needs to be given an address
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where the value should be stored. */
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unsigned int returns_struct : 1;
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/* Nonzero if function being compiled needs to
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return the address of where it has put a structure value. */
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unsigned int returns_pcc_struct : 1;
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/* Nonzero if the current function returns a pointer type. */
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unsigned int returns_pointer : 1;
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/* Nonzero if function being compiled needs to be passed a static chain. */
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unsigned int needs_context : 1;
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/* Nonzero if function being compiled can call setjmp. */
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unsigned int calls_setjmp : 1;
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/* Nonzero if function being compiled can call longjmp. */
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unsigned int calls_longjmp : 1;
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/* Nonzero if function being compiled can call alloca,
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either as a subroutine or builtin. */
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unsigned int calls_alloca : 1;
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/* Nonzero if the function calls __builtin_eh_return. */
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unsigned int calls_eh_return : 1;
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/* Nonzero if the function calls __builtin_constant_p. */
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unsigned int calls_constant_p : 1;
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/* Nonzero if function being compiled receives nonlocal gotos
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from nested functions. */
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unsigned int has_nonlocal_label : 1;
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/* Nonzero if function being compiled has nonlocal gotos to parent
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function. */
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unsigned int has_nonlocal_goto : 1;
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/* Nonzero if function being compiled contains nested functions. */
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unsigned int contains_functions : 1;
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/* Nonzero if the function being compiled issues a computed jump. */
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unsigned int has_computed_jump : 1;
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/* Nonzero if the current function is a thunk, i.e., a lightweight
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function implemented by the output_mi_thunk hook) that just
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adjusts one of its arguments and forwards to another
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function. */
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unsigned int is_thunk : 1;
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/* This bit is used by the exception handling logic. It is set if all
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calls (if any) are sibling calls. Such functions do not have to
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have EH tables generated, as they cannot throw. A call to such a
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function, however, should be treated as throwing if any of its callees
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can throw. */
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unsigned int all_throwers_are_sibcalls : 1;
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/* Nonzero if instrumentation calls for function entry and exit should be
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generated. */
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unsigned int instrument_entry_exit : 1;
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/* Nonzero if profiling code should be generated. */
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unsigned int profile : 1;
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/* Nonzero if stack limit checking should be enabled in the current
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function. */
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unsigned int limit_stack : 1;
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/* Nonzero if current function uses stdarg.h or equivalent. */
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unsigned int stdarg : 1;
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/* Nonzero if this function is being processed in function-at-a-time
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mode. In other words, if all tree structure for this function,
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including the BLOCK tree, is created before RTL generation
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commences. */
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unsigned int x_whole_function_mode_p : 1;
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/* Nonzero if the back-end should not keep track of expressions that
|
||
determine the size of variable-sized objects. Normally, such
|
||
expressions are saved away, and then expanded when the next
|
||
function is started. For example, if a parameter has a
|
||
variable-sized type, then the size of the parameter is computed
|
||
when the function body is entered. However, some front-ends do
|
||
not desire this behavior. */
|
||
unsigned int x_dont_save_pending_sizes_p : 1;
|
||
|
||
/* Nonzero if the current function uses the constant pool. */
|
||
unsigned int uses_const_pool : 1;
|
||
|
||
/* Nonzero if the current function uses pic_offset_table_rtx. */
|
||
unsigned int uses_pic_offset_table : 1;
|
||
|
||
/* Nonzero if the current function needs an lsda for exception handling. */
|
||
unsigned int uses_eh_lsda : 1;
|
||
|
||
/* Nonzero if code to initialize arg_pointer_save_area has been emitted. */
|
||
unsigned int arg_pointer_save_area_init : 1;
|
||
|
||
/* Flag for use by ther rtl inliner, to tell if the function has been
|
||
processed at least once. */
|
||
unsigned int rtl_inline_init : 1;
|
||
|
||
/* Nonzero if the rtl inliner has saved the function for inlining. */
|
||
unsigned int saved_for_inline : 1;
|
||
};
|
||
|
||
/* The function currently being compiled. */
|
||
extern GTY(()) struct function *cfun;
|
||
|
||
/* Pointer to chain of `struct function' for containing functions. */
|
||
extern GTY(()) struct function *outer_function_chain;
|
||
|
||
/* Nonzero if we've already converted virtual regs to hard regs. */
|
||
extern int virtuals_instantiated;
|
||
|
||
/* Nonzero if at least one trampoline has been created. */
|
||
extern int trampolines_created;
|
||
|
||
/* For backward compatibility... eventually these should all go away. */
|
||
#define current_function_pops_args (cfun->pops_args)
|
||
#define current_function_returns_struct (cfun->returns_struct)
|
||
#define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
|
||
#define current_function_returns_pointer (cfun->returns_pointer)
|
||
#define current_function_needs_context (cfun->needs_context)
|
||
#define current_function_calls_setjmp (cfun->calls_setjmp)
|
||
#define current_function_calls_alloca (cfun->calls_alloca)
|
||
#define current_function_calls_longjmp (cfun->calls_longjmp)
|
||
#define current_function_calls_eh_return (cfun->calls_eh_return)
|
||
#define current_function_calls_constant_p (cfun->calls_constant_p)
|
||
#define current_function_has_computed_jump (cfun->has_computed_jump)
|
||
#define current_function_contains_functions (cfun->contains_functions)
|
||
#define current_function_is_thunk (cfun->is_thunk)
|
||
#define current_function_args_info (cfun->args_info)
|
||
#define current_function_args_size (cfun->args_size)
|
||
#define current_function_pretend_args_size (cfun->pretend_args_size)
|
||
#define current_function_outgoing_args_size (cfun->outgoing_args_size)
|
||
#define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
|
||
#define current_function_stdarg (cfun->stdarg)
|
||
#define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
|
||
#define current_function_return_rtx (cfun->return_rtx)
|
||
#define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
|
||
#define current_function_profile (cfun->profile)
|
||
#define current_function_funcdef_no (cfun->funcdef_no)
|
||
#define current_function_limit_stack (cfun->limit_stack)
|
||
#define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
|
||
#define current_function_uses_const_pool (cfun->uses_const_pool)
|
||
#define current_function_cannot_inline (cfun->cannot_inline)
|
||
#define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
|
||
#define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
|
||
#define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
|
||
|
||
#define max_parm_reg (cfun->x_max_parm_reg)
|
||
#define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
|
||
#define cleanup_label (cfun->x_cleanup_label)
|
||
#define return_label (cfun->x_return_label)
|
||
#define naked_return_label (cfun->x_naked_return_label)
|
||
#define save_expr_regs (cfun->x_save_expr_regs)
|
||
#define stack_slot_list (cfun->x_stack_slot_list)
|
||
#define parm_birth_insn (cfun->x_parm_birth_insn)
|
||
#define frame_offset (cfun->x_frame_offset)
|
||
#define tail_recursion_label (cfun->x_tail_recursion_label)
|
||
#define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
|
||
#define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
|
||
#define rtl_expr_chain (cfun->x_rtl_expr_chain)
|
||
#define last_parm_insn (cfun->x_last_parm_insn)
|
||
#define context_display (cfun->x_context_display)
|
||
#define trampoline_list (cfun->x_trampoline_list)
|
||
#define function_call_count (cfun->x_function_call_count)
|
||
#define temp_slots (cfun->x_temp_slots)
|
||
#define temp_slot_level (cfun->x_temp_slot_level)
|
||
#define target_temp_slot_level (cfun->x_target_temp_slot_level)
|
||
#define var_temp_slot_level (cfun->x_var_temp_slot_level)
|
||
#define nonlocal_labels (cfun->x_nonlocal_labels)
|
||
#define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
|
||
#define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
|
||
#define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
|
||
|
||
/* The FUNCTION_DECL for an inline function currently being expanded. */
|
||
extern tree inline_function_decl;
|
||
|
||
/* Given a function decl for a containing function,
|
||
return the `struct function' for it. */
|
||
struct function *find_function_data (tree);
|
||
|
||
/* Set NOTE_BLOCK for each block note in the current function. */
|
||
extern void identify_blocks (void);
|
||
|
||
/* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
|
||
and create duplicate blocks. */
|
||
extern void reorder_blocks (void);
|
||
|
||
/* Set BLOCK_NUMBER for all the blocks in FN. */
|
||
extern void number_blocks (tree);
|
||
|
||
/* Return size needed for stack frame based on slots so far allocated.
|
||
This size counts from zero. It is not rounded to STACK_BOUNDARY;
|
||
the caller may have to do that. */
|
||
extern HOST_WIDE_INT get_frame_size (void);
|
||
/* Likewise, but for a different than the current function. */
|
||
extern HOST_WIDE_INT get_func_frame_size (struct function *);
|
||
|
||
/* A pointer to a function to create target specific, per-function
|
||
data structures. */
|
||
extern struct machine_function * (*init_machine_status) (void);
|
||
|
||
/* Save and restore status information for a nested function. */
|
||
extern void restore_emit_status (struct function *);
|
||
extern void free_after_parsing (struct function *);
|
||
extern void free_after_compilation (struct function *);
|
||
|
||
extern void init_varasm_status (struct function *);
|
||
|
||
#ifdef RTX_CODE
|
||
extern void diddle_return_value (void (*)(rtx, void*), void*);
|
||
extern void clobber_return_register (void);
|
||
extern void use_return_register (void);
|
||
#endif
|
||
|
||
extern rtx get_arg_pointer_save_area (struct function *);
|
||
|
||
extern void init_virtual_regs (struct emit_status *);
|
||
|
||
/* Returns the name of the current function. */
|
||
extern const char *current_function_name (void);
|
||
|
||
/* Called once, at initialization, to initialize function.c. */
|
||
extern void init_function_once (void);
|
||
|
||
extern void do_warn_unused_parameter (tree);
|
||
|
||
#endif /* GCC_FUNCTION_H */
|