870 lines
22 KiB
C
870 lines
22 KiB
C
/* Dwarf2 assembler output helper routines.
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Copyright (C) 2001, 2002, 2003 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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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "flags.h"
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#include "tree.h"
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#include "rtl.h"
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#include "output.h"
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#include "target.h"
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#include "dwarf2asm.h"
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#include "dwarf2.h"
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#include "splay-tree.h"
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#include "ggc.h"
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#include "tm_p.h"
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/* How to start an assembler comment. */
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#ifndef ASM_COMMENT_START
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#define ASM_COMMENT_START ";#"
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#endif
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/* Output an unaligned integer with the given value and size. Prefer not
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to print a newline, since the caller may want to add a comment. */
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void
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dw2_assemble_integer (int size, rtx x)
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{
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const char *op = integer_asm_op (size, FALSE);
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if (op)
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{
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fputs (op, asm_out_file);
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if (GET_CODE (x) == CONST_INT)
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fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, INTVAL (x));
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else
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output_addr_const (asm_out_file, x);
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}
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else
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assemble_integer (x, size, BITS_PER_UNIT, 1);
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}
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/* Output an immediate constant in a given size. */
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void
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dw2_asm_output_data (int size, unsigned HOST_WIDE_INT value,
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const char *comment, ...)
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{
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va_list ap;
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va_start (ap, comment);
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if (size * 8 < HOST_BITS_PER_WIDE_INT)
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value &= ~(~(unsigned HOST_WIDE_INT) 0 << (size * 8));
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dw2_assemble_integer (size, GEN_INT (value));
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output the difference between two symbols in a given size. */
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/* ??? There appear to be assemblers that do not like such
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subtraction, but do support ASM_SET_OP. It's unfortunately
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impossible to do here, since the ASM_SET_OP for the difference
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symbol must appear after both symbols are defined. */
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void
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dw2_asm_output_delta (int size, const char *lab1, const char *lab2,
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const char *comment, ...)
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{
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va_list ap;
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va_start (ap, comment);
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#ifdef ASM_OUTPUT_DWARF_DELTA
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ASM_OUTPUT_DWARF_DELTA (asm_out_file, size, lab1, lab2);
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#else
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dw2_assemble_integer (size,
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gen_rtx_MINUS (Pmode,
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gen_rtx_SYMBOL_REF (Pmode, lab1),
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gen_rtx_SYMBOL_REF (Pmode, lab2)));
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output a section-relative reference to a label. In general this
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can only be done for debugging symbols. E.g. on most targets with
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the GNU linker, this is accomplished with a direct reference and
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the knowledge that the debugging section will be placed at VMA 0.
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Some targets have special relocations for this that we must use. */
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void
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dw2_asm_output_offset (int size, const char *label,
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const char *comment, ...)
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{
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va_list ap;
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va_start (ap, comment);
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#ifdef ASM_OUTPUT_DWARF_OFFSET
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ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label);
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#else
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dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output a self-relative reference to a label, possibly in a
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different section or object file. */
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void
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dw2_asm_output_pcrel (int size ATTRIBUTE_UNUSED,
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const char *label ATTRIBUTE_UNUSED,
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const char *comment, ...)
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{
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va_list ap;
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va_start (ap, comment);
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#ifdef ASM_OUTPUT_DWARF_PCREL
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ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, label);
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#else
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dw2_assemble_integer (size,
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gen_rtx_MINUS (Pmode,
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gen_rtx_SYMBOL_REF (Pmode, label),
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pc_rtx));
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#endif
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output an absolute reference to a label. */
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void
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dw2_asm_output_addr (int size, const char *label,
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const char *comment, ...)
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{
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va_list ap;
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va_start (ap, comment);
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dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Similar, but use an RTX expression instead of a text label. */
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void
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dw2_asm_output_addr_rtx (int size, rtx addr,
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const char *comment, ...)
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{
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va_list ap;
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va_start (ap, comment);
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dw2_assemble_integer (size, addr);
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if (flag_debug_asm && comment)
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{
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fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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}
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fputc ('\n', asm_out_file);
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va_end (ap);
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}
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/* Output the first ORIG_LEN characters of STR as a string.
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If ORIG_LEN is equal to -1, ignore this parameter and output
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the entire STR instead.
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If COMMENT is not NULL and comments in the debug information
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have been requested by the user, append the given COMMENT
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to the generated output. */
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void
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dw2_asm_output_nstring (const char *str, size_t orig_len,
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const char *comment, ...)
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{
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size_t i, len;
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va_list ap;
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va_start (ap, comment);
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len = orig_len;
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if (len == (size_t) -1)
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len = strlen (str);
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if (flag_debug_asm && comment)
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{
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fputs ("\t.ascii \"", asm_out_file);
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for (i = 0; i < len; i++)
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{
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int c = str[i];
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if (c == '\"' || c == '\\')
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fputc ('\\', asm_out_file);
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if (ISPRINT(c))
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fputc (c, asm_out_file);
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else
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fprintf (asm_out_file, "\\%o", c);
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}
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fprintf (asm_out_file, "\\0\"\t%s ", ASM_COMMENT_START);
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vfprintf (asm_out_file, comment, ap);
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fputc ('\n', asm_out_file);
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}
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else
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{
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/* If an explicit length was given, we can't assume there
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is a null termination in the string buffer. */
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if (orig_len == (size_t) -1)
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len += 1;
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ASM_OUTPUT_ASCII (asm_out_file, str, len);
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if (orig_len != (size_t) -1)
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assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
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}
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va_end (ap);
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}
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/* Return the size of an unsigned LEB128 quantity. */
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int
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size_of_uleb128 (unsigned HOST_WIDE_INT value)
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{
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int size = 0;
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do
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{
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value >>= 7;
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size += 1;
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}
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while (value != 0);
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return size;
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}
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/* Return the size of a signed LEB128 quantity. */
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int
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size_of_sleb128 (HOST_WIDE_INT value)
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{
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int size = 0, byte;
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do
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{
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byte = (value & 0x7f);
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value >>= 7;
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size += 1;
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}
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while (!((value == 0 && (byte & 0x40) == 0)
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|| (value == -1 && (byte & 0x40) != 0)));
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return size;
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}
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/* Given an encoding, return the number of bytes the format occupies.
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This is only defined for fixed-size encodings, and so does not
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include leb128. */
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int
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size_of_encoded_value (int encoding)
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{
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if (encoding == DW_EH_PE_omit)
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return 0;
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switch (encoding & 0x07)
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{
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case DW_EH_PE_absptr:
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return POINTER_SIZE / BITS_PER_UNIT;
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case DW_EH_PE_udata2:
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return 2;
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case DW_EH_PE_udata4:
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return 4;
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case DW_EH_PE_udata8:
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return 8;
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}
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abort ();
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}
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/* Yield a name for a given pointer encoding. */
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const char *
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eh_data_format_name (int format)
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{
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#if HAVE_DESIGNATED_INITIALIZERS
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#define S(p, v) [p] = v,
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#else
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#define S(p, v) case p: return v;
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#endif
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#if HAVE_DESIGNATED_INITIALIZERS
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__extension__ static const char * const format_names[256] = {
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#else
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switch (format) {
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#endif
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S(DW_EH_PE_absptr, "absolute")
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S(DW_EH_PE_omit, "omit")
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S(DW_EH_PE_aligned, "aligned absolute")
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S(DW_EH_PE_uleb128, "uleb128")
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S(DW_EH_PE_udata2, "udata2")
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S(DW_EH_PE_udata4, "udata4")
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S(DW_EH_PE_udata8, "udata8")
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S(DW_EH_PE_sleb128, "sleb128")
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S(DW_EH_PE_sdata2, "sdata2")
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S(DW_EH_PE_sdata4, "sdata4")
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S(DW_EH_PE_sdata8, "sdata8")
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S(DW_EH_PE_absptr | DW_EH_PE_pcrel, "pcrel")
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S(DW_EH_PE_uleb128 | DW_EH_PE_pcrel, "pcrel uleb128")
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S(DW_EH_PE_udata2 | DW_EH_PE_pcrel, "pcrel udata2")
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S(DW_EH_PE_udata4 | DW_EH_PE_pcrel, "pcrel udata4")
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S(DW_EH_PE_udata8 | DW_EH_PE_pcrel, "pcrel udata8")
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S(DW_EH_PE_sleb128 | DW_EH_PE_pcrel, "pcrel sleb128")
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S(DW_EH_PE_sdata2 | DW_EH_PE_pcrel, "pcrel sdata2")
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S(DW_EH_PE_sdata4 | DW_EH_PE_pcrel, "pcrel sdata4")
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S(DW_EH_PE_sdata8 | DW_EH_PE_pcrel, "pcrel sdata8")
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S(DW_EH_PE_absptr | DW_EH_PE_textrel, "textrel")
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S(DW_EH_PE_uleb128 | DW_EH_PE_textrel, "textrel uleb128")
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S(DW_EH_PE_udata2 | DW_EH_PE_textrel, "textrel udata2")
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S(DW_EH_PE_udata4 | DW_EH_PE_textrel, "textrel udata4")
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S(DW_EH_PE_udata8 | DW_EH_PE_textrel, "textrel udata8")
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S(DW_EH_PE_sleb128 | DW_EH_PE_textrel, "textrel sleb128")
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S(DW_EH_PE_sdata2 | DW_EH_PE_textrel, "textrel sdata2")
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S(DW_EH_PE_sdata4 | DW_EH_PE_textrel, "textrel sdata4")
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S(DW_EH_PE_sdata8 | DW_EH_PE_textrel, "textrel sdata8")
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S(DW_EH_PE_absptr | DW_EH_PE_datarel, "datarel")
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S(DW_EH_PE_uleb128 | DW_EH_PE_datarel, "datarel uleb128")
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S(DW_EH_PE_udata2 | DW_EH_PE_datarel, "datarel udata2")
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S(DW_EH_PE_udata4 | DW_EH_PE_datarel, "datarel udata4")
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S(DW_EH_PE_udata8 | DW_EH_PE_datarel, "datarel udata8")
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S(DW_EH_PE_sleb128 | DW_EH_PE_datarel, "datarel sleb128")
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S(DW_EH_PE_sdata2 | DW_EH_PE_datarel, "datarel sdata2")
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S(DW_EH_PE_sdata4 | DW_EH_PE_datarel, "datarel sdata4")
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S(DW_EH_PE_sdata8 | DW_EH_PE_datarel, "datarel sdata8")
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S(DW_EH_PE_absptr | DW_EH_PE_funcrel, "funcrel")
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S(DW_EH_PE_uleb128 | DW_EH_PE_funcrel, "funcrel uleb128")
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S(DW_EH_PE_udata2 | DW_EH_PE_funcrel, "funcrel udata2")
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S(DW_EH_PE_udata4 | DW_EH_PE_funcrel, "funcrel udata4")
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S(DW_EH_PE_udata8 | DW_EH_PE_funcrel, "funcrel udata8")
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S(DW_EH_PE_sleb128 | DW_EH_PE_funcrel, "funcrel sleb128")
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S(DW_EH_PE_sdata2 | DW_EH_PE_funcrel, "funcrel sdata2")
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S(DW_EH_PE_sdata4 | DW_EH_PE_funcrel, "funcrel sdata4")
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S(DW_EH_PE_sdata8 | DW_EH_PE_funcrel, "funcrel sdata8")
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S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_pcrel,
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"indirect pcrel")
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S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_pcrel,
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"indirect pcrel uleb128")
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S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_pcrel,
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"indirect pcrel udata2")
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S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_pcrel,
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"indirect pcrel udata4")
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S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_pcrel,
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"indirect pcrel udata8")
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S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_pcrel,
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"indirect pcrel sleb128")
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S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_pcrel,
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"indirect pcrel sdata2")
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S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_pcrel,
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"indirect pcrel sdata4")
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S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_pcrel,
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"indirect pcrel sdata8")
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S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_textrel,
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"indirect textrel")
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S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_textrel,
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"indirect textrel uleb128")
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S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_textrel,
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"indirect textrel udata2")
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S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_textrel,
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"indirect textrel udata4")
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S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_textrel,
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"indirect textrel udata8")
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S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_textrel,
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"indirect textrel sleb128")
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S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_textrel,
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"indirect textrel sdata2")
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S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_textrel,
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"indirect textrel sdata4")
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S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_textrel,
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"indirect textrel sdata8")
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S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_datarel,
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"indirect datarel")
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S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_datarel,
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"indirect datarel uleb128")
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S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_datarel,
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"indirect datarel udata2")
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S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_datarel,
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"indirect datarel udata4")
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S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_datarel,
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"indirect datarel udata8")
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S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_datarel,
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"indirect datarel sleb128")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_datarel,
|
||
"indirect datarel sdata2")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_datarel,
|
||
"indirect datarel sdata4")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_datarel,
|
||
"indirect datarel sdata8")
|
||
|
||
S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_funcrel,
|
||
"indirect funcrel")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_funcrel,
|
||
"indirect funcrel uleb128")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_funcrel,
|
||
"indirect funcrel udata2")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_funcrel,
|
||
"indirect funcrel udata4")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_funcrel,
|
||
"indirect funcrel udata8")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_funcrel,
|
||
"indirect funcrel sleb128")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_funcrel,
|
||
"indirect funcrel sdata2")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_funcrel,
|
||
"indirect funcrel sdata4")
|
||
S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_funcrel,
|
||
"indirect funcrel sdata8")
|
||
|
||
#if HAVE_DESIGNATED_INITIALIZERS
|
||
};
|
||
|
||
if (format < 0 || format > 0xff || format_names[format] == NULL)
|
||
abort ();
|
||
return format_names[format];
|
||
#else
|
||
}
|
||
abort ();
|
||
#endif
|
||
}
|
||
|
||
/* Output an unsigned LEB128 quantity. */
|
||
|
||
void
|
||
dw2_asm_output_data_uleb128 (unsigned HOST_WIDE_INT value,
|
||
const char *comment, ...)
|
||
{
|
||
va_list ap;
|
||
|
||
va_start (ap, comment);
|
||
|
||
#ifdef HAVE_AS_LEB128
|
||
fprintf (asm_out_file, "\t.uleb128 " HOST_WIDE_INT_PRINT_HEX , value);
|
||
|
||
if (flag_debug_asm && comment)
|
||
{
|
||
fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
#else
|
||
{
|
||
unsigned HOST_WIDE_INT work = value;
|
||
const char *byte_op = targetm.asm_out.byte_op;
|
||
|
||
if (byte_op)
|
||
fputs (byte_op, asm_out_file);
|
||
do
|
||
{
|
||
int byte = (work & 0x7f);
|
||
work >>= 7;
|
||
if (work != 0)
|
||
/* More bytes to follow. */
|
||
byte |= 0x80;
|
||
|
||
if (byte_op)
|
||
{
|
||
fprintf (asm_out_file, "0x%x", byte);
|
||
if (work != 0)
|
||
fputc (',', asm_out_file);
|
||
}
|
||
else
|
||
assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
|
||
}
|
||
while (work != 0);
|
||
|
||
if (flag_debug_asm)
|
||
{
|
||
fprintf (asm_out_file, "\t%s uleb128 " HOST_WIDE_INT_PRINT_HEX,
|
||
ASM_COMMENT_START, value);
|
||
if (comment)
|
||
{
|
||
fputs ("; ", asm_out_file);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
fputc ('\n', asm_out_file);
|
||
|
||
va_end (ap);
|
||
}
|
||
|
||
/* Output a signed LEB128 quantity. */
|
||
|
||
void
|
||
dw2_asm_output_data_sleb128 (HOST_WIDE_INT value,
|
||
const char *comment, ...)
|
||
{
|
||
va_list ap;
|
||
|
||
va_start (ap, comment);
|
||
|
||
#ifdef HAVE_AS_LEB128
|
||
fprintf (asm_out_file, "\t.sleb128 " HOST_WIDE_INT_PRINT_DEC, value);
|
||
|
||
if (flag_debug_asm && comment)
|
||
{
|
||
fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
#else
|
||
{
|
||
HOST_WIDE_INT work = value;
|
||
int more, byte;
|
||
const char *byte_op = targetm.asm_out.byte_op;
|
||
|
||
if (byte_op)
|
||
fputs (byte_op, asm_out_file);
|
||
do
|
||
{
|
||
byte = (work & 0x7f);
|
||
/* arithmetic shift */
|
||
work >>= 7;
|
||
more = !((work == 0 && (byte & 0x40) == 0)
|
||
|| (work == -1 && (byte & 0x40) != 0));
|
||
if (more)
|
||
byte |= 0x80;
|
||
|
||
if (byte_op)
|
||
{
|
||
fprintf (asm_out_file, "0x%x", byte);
|
||
if (more)
|
||
fputc (',', asm_out_file);
|
||
}
|
||
else
|
||
assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
|
||
}
|
||
while (more);
|
||
|
||
if (flag_debug_asm)
|
||
{
|
||
fprintf (asm_out_file, "\t%s sleb128 " HOST_WIDE_INT_PRINT_DEC,
|
||
ASM_COMMENT_START, value);
|
||
if (comment)
|
||
{
|
||
fputs ("; ", asm_out_file);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
fputc ('\n', asm_out_file);
|
||
|
||
va_end (ap);
|
||
}
|
||
|
||
void
|
||
dw2_asm_output_delta_uleb128 (const char *lab1 ATTRIBUTE_UNUSED,
|
||
const char *lab2 ATTRIBUTE_UNUSED,
|
||
const char *comment, ...)
|
||
{
|
||
va_list ap;
|
||
|
||
va_start (ap, comment);
|
||
|
||
#ifdef HAVE_AS_LEB128
|
||
fputs ("\t.uleb128 ", asm_out_file);
|
||
assemble_name (asm_out_file, lab1);
|
||
fputc ('-', asm_out_file);
|
||
assemble_name (asm_out_file, lab2);
|
||
#else
|
||
abort ();
|
||
#endif
|
||
|
||
if (flag_debug_asm && comment)
|
||
{
|
||
fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
fputc ('\n', asm_out_file);
|
||
|
||
va_end (ap);
|
||
}
|
||
|
||
void
|
||
dw2_asm_output_delta_sleb128 (const char *lab1 ATTRIBUTE_UNUSED,
|
||
const char *lab2 ATTRIBUTE_UNUSED,
|
||
const char *comment, ...)
|
||
{
|
||
va_list ap;
|
||
|
||
va_start (ap, comment);
|
||
|
||
#ifdef HAVE_AS_LEB128
|
||
fputs ("\t.sleb128 ", asm_out_file);
|
||
assemble_name (asm_out_file, lab1);
|
||
fputc ('-', asm_out_file);
|
||
assemble_name (asm_out_file, lab2);
|
||
#else
|
||
abort ();
|
||
#endif
|
||
|
||
if (flag_debug_asm && comment)
|
||
{
|
||
fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
fputc ('\n', asm_out_file);
|
||
|
||
va_end (ap);
|
||
}
|
||
|
||
static rtx dw2_force_const_mem (rtx);
|
||
static int dw2_output_indirect_constant_1 (splay_tree_node, void *);
|
||
|
||
static GTY((param1_is (char *), param2_is (tree))) splay_tree indirect_pool;
|
||
|
||
static GTY(()) int dw2_const_labelno;
|
||
|
||
#if defined(HAVE_GAS_HIDDEN) && defined(SUPPORTS_ONE_ONLY)
|
||
# define USE_LINKONCE_INDIRECT 1
|
||
#else
|
||
# define USE_LINKONCE_INDIRECT 0
|
||
#endif
|
||
|
||
/* Put X, a SYMBOL_REF, in memory. Return a SYMBOL_REF to the allocated
|
||
memory. Differs from force_const_mem in that a single pool is used for
|
||
the entire unit of translation, and the memory is not guaranteed to be
|
||
"near" the function in any interesting sense. */
|
||
|
||
static rtx
|
||
dw2_force_const_mem (rtx x)
|
||
{
|
||
splay_tree_node node;
|
||
const char *str;
|
||
tree decl;
|
||
|
||
if (! indirect_pool)
|
||
indirect_pool = splay_tree_new_ggc (splay_tree_compare_pointers);
|
||
|
||
if (GET_CODE (x) != SYMBOL_REF)
|
||
abort ();
|
||
|
||
str = (* targetm.strip_name_encoding) (XSTR (x, 0));
|
||
node = splay_tree_lookup (indirect_pool, (splay_tree_key) str);
|
||
if (node)
|
||
decl = (tree) node->value;
|
||
else
|
||
{
|
||
tree id;
|
||
|
||
if (USE_LINKONCE_INDIRECT)
|
||
{
|
||
char *ref_name = alloca (strlen (str) + sizeof "DW.ref.");
|
||
|
||
sprintf (ref_name, "DW.ref.%s", str);
|
||
id = get_identifier (ref_name);
|
||
decl = build_decl (VAR_DECL, id, ptr_type_node);
|
||
DECL_ARTIFICIAL (decl) = 1;
|
||
TREE_PUBLIC (decl) = 1;
|
||
DECL_INITIAL (decl) = decl;
|
||
make_decl_one_only (decl);
|
||
}
|
||
else
|
||
{
|
||
char label[32];
|
||
|
||
ASM_GENERATE_INTERNAL_LABEL (label, "LDFCM", dw2_const_labelno);
|
||
++dw2_const_labelno;
|
||
id = get_identifier (label);
|
||
decl = build_decl (VAR_DECL, id, ptr_type_node);
|
||
DECL_ARTIFICIAL (decl) = 1;
|
||
TREE_STATIC (decl) = 1;
|
||
DECL_INITIAL (decl) = decl;
|
||
}
|
||
|
||
id = maybe_get_identifier (str);
|
||
if (id)
|
||
TREE_SYMBOL_REFERENCED (id) = 1;
|
||
|
||
splay_tree_insert (indirect_pool, (splay_tree_key) str,
|
||
(splay_tree_value) decl);
|
||
}
|
||
|
||
return XEXP (DECL_RTL (decl), 0);
|
||
}
|
||
|
||
/* A helper function for dw2_output_indirect_constants called through
|
||
splay_tree_foreach. Emit one queued constant to memory. */
|
||
|
||
static int
|
||
dw2_output_indirect_constant_1 (splay_tree_node node,
|
||
void *data ATTRIBUTE_UNUSED)
|
||
{
|
||
const char *sym;
|
||
rtx sym_ref;
|
||
|
||
sym = (const char *) node->key;
|
||
sym_ref = gen_rtx_SYMBOL_REF (Pmode, sym);
|
||
if (USE_LINKONCE_INDIRECT)
|
||
fprintf (asm_out_file, "\t.hidden %sDW.ref.%s\n", user_label_prefix, sym);
|
||
assemble_variable ((tree) node->value, 1, 1, 1);
|
||
assemble_integer (sym_ref, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Emit the constants queued through dw2_force_const_mem. */
|
||
|
||
void
|
||
dw2_output_indirect_constants (void)
|
||
{
|
||
if (indirect_pool)
|
||
splay_tree_foreach (indirect_pool, dw2_output_indirect_constant_1, NULL);
|
||
}
|
||
|
||
/* Like dw2_asm_output_addr_rtx, but encode the pointer as directed. */
|
||
|
||
void
|
||
dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr,
|
||
const char *comment, ...)
|
||
{
|
||
int size;
|
||
va_list ap;
|
||
|
||
va_start (ap, comment);
|
||
|
||
size = size_of_encoded_value (encoding);
|
||
|
||
if (encoding == DW_EH_PE_aligned)
|
||
{
|
||
assemble_align (POINTER_SIZE);
|
||
assemble_integer (addr, size, POINTER_SIZE, 1);
|
||
return;
|
||
}
|
||
|
||
/* NULL is _always_ represented as a plain zero, as is 1 for Ada's
|
||
"all others". */
|
||
if (addr == const0_rtx || addr == const1_rtx)
|
||
assemble_integer (addr, size, BITS_PER_UNIT, 1);
|
||
else
|
||
{
|
||
restart:
|
||
/* Allow the target first crack at emitting this. Some of the
|
||
special relocations require special directives instead of
|
||
just ".4byte" or whatever. */
|
||
#ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
|
||
ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX (asm_out_file, encoding, size,
|
||
addr, done);
|
||
#endif
|
||
|
||
/* Indirection is used to get dynamic relocations out of a
|
||
read-only section. */
|
||
if (encoding & DW_EH_PE_indirect)
|
||
{
|
||
/* It is very tempting to use force_const_mem so that we share data
|
||
with the normal constant pool. However, we've already emitted
|
||
the constant pool for this function. Moreover, we'd like to
|
||
share these constants across the entire unit of translation,
|
||
or better, across the entire application (or DSO). */
|
||
addr = dw2_force_const_mem (addr);
|
||
encoding &= ~DW_EH_PE_indirect;
|
||
goto restart;
|
||
}
|
||
|
||
switch (encoding & 0xF0)
|
||
{
|
||
case DW_EH_PE_absptr:
|
||
dw2_assemble_integer (size, addr);
|
||
break;
|
||
|
||
case DW_EH_PE_pcrel:
|
||
if (GET_CODE (addr) != SYMBOL_REF)
|
||
abort ();
|
||
#ifdef ASM_OUTPUT_DWARF_PCREL
|
||
ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, XSTR (addr, 0));
|
||
#else
|
||
dw2_assemble_integer (size, gen_rtx_MINUS (Pmode, addr, pc_rtx));
|
||
#endif
|
||
break;
|
||
|
||
default:
|
||
/* Other encodings should have been handled by
|
||
ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX. */
|
||
abort ();
|
||
}
|
||
|
||
#ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
|
||
done:;
|
||
#endif
|
||
}
|
||
|
||
if (flag_debug_asm && comment)
|
||
{
|
||
fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
|
||
vfprintf (asm_out_file, comment, ap);
|
||
}
|
||
fputc ('\n', asm_out_file);
|
||
|
||
va_end (ap);
|
||
}
|
||
|
||
#include "gt-dwarf2asm.h"
|