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gcc-11 and gcc-12 pass -gdwarf-5 to gas, in order to prime gas for DWARF 5 level debug info. Unfortunately it seems there are cases where the compiler does not emit a .file or .loc dwarf debug directive before any machine instructions. (Note that the .file directive typically emitted as the first line of assembly output doesn't count as a dwarf debug directive. The dwarf .file has a file number before the file name string.) This patch delays allocation of file numbers for gas generated line debug info until the end of assembly, thus avoiding any clashes with compiler generated file numbers. Two fixes for test case source are necessary; A .loc can't use a file number that hasn't already been specified with .file. A followup patch will remove all the gas generated line info on seeing a .file directive. PR 28149 * dwarf2dbg.c (num_of_auto_assigned): Delete. (current): Update initialisation. (set_or_check_view): Replace all accesses to view with u.view. (dwarf2_consume_line_info): Likewise. (dwarf2_directive_loc): Likewise. Assert that we aren't generating line info. (dwarf2_gen_line_info_1): Don't call set_or_check_view on gas generated line entries. (dwarf2_gen_line_info): Set and track filenames for gas generated line entries. Simplify generation of labels. (get_directory_table_entry): Use filename_cmp when comparing dirs. (do_allocate_filenum): New function. (dwarf2_where): Set u.filename and filenum to -1 for gas generated line entries. (dwarf2_directive_filename): Remove num_of_auto_assigned handling. (process_entries): Update view field access. Call do_allocate_filenum. * dwarf2dbg.h (struct dwarf2_line_info): Add filename field in union aliasing view. * testsuite/gas/i386/dwarf2-line-3.s: Add .file directive. * testsuite/gas/i386/dwarf2-line-4.s: Likewise. * testsuite/gas/i386/dwarf2-line-4.d: Update expected output. * testsuite/gas/i386/dwarf4-line-1.d: Likewise. * testsuite/gas/i386/dwarf5-line-1.d: Likewise. * testsuite/gas/i386/dwarf5-line-2.d: Likewise.
128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/* dwarf2dbg.h - DWARF2 debug support
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Copyright (C) 1999-2021 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifndef AS_DWARF2DBG_H
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#define AS_DWARF2DBG_H
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#include "as.h"
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#define DWARF2_FLAG_IS_STMT (1 << 0)
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#define DWARF2_FLAG_BASIC_BLOCK (1 << 1)
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#define DWARF2_FLAG_PROLOGUE_END (1 << 2)
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#define DWARF2_FLAG_EPILOGUE_BEGIN (1 << 3)
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struct dwarf2_line_info
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{
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unsigned int filenum;
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unsigned int line;
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unsigned int column;
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unsigned int isa;
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unsigned int flags;
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unsigned int discriminator;
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/* filenum == -1u chooses filename, otherwise view. */
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union
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{
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symbolS *view;
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const char *filename;
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} u;
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};
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/* Implements the .file FILENO "FILENAME" directive. FILENO can be 0
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to indicate that no file number has been assigned. All real file
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number must be >0. The second form returns the filename extracted
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from the input stream. */
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extern void dwarf2_directive_file (int);
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extern char * dwarf2_directive_filename (void);
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/* Implements the .loc FILENO LINENO [COLUMN] directive. FILENO is
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the file number, LINENO the line number and the (optional) COLUMN
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the column of the source code that the following instruction
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corresponds to. FILENO can be 0 to indicate that the filename
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specified by the textually most recent .file directive should be
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used. */
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extern void dwarf2_directive_loc (int);
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/* Implements the .loc_mark_labels {0,1} directive. */
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extern void dwarf2_directive_loc_mark_labels (int);
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/* Returns the current source information. If .file directives have
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been encountered, the info for the corresponding source file is
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returned. Otherwise, the info for the assembly source file is
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returned. */
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extern void dwarf2_where (struct dwarf2_line_info *);
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/* A hook to allow the target backend to inform the line number state
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machine of isa changes when assembler debug info is enabled. */
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extern void dwarf2_set_isa (unsigned int);
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/* This function generates .debug_line info based on the address and
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source information passed in the arguments. ADDR should be the
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frag-relative offset of the instruction the information is for and
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L is the source information that should be associated with that
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address. */
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extern void dwarf2_gen_line_info (addressT, struct dwarf2_line_info *);
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/* Must be called for each generated instruction. */
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extern void dwarf2_emit_insn (int);
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void dwarf2_move_insn (int);
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/* Reset the state of the line number information to reflect that
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it has been used. */
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extern void dwarf2_consume_line_info (void);
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/* Should be called for each code label. */
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extern void dwarf2_emit_label (symbolS *);
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/* True when we've seen a .loc directive recently. Used to avoid
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doing work when there's nothing to do. */
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extern bool dwarf2_loc_directive_seen;
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/* True when we're supposed to set the basic block mark whenever a label
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is seen. Unless the target is doing Something Weird, just call
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dwarf2_emit_label. */
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extern bool dwarf2_loc_mark_labels;
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extern void dwarf2_init (void);
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extern void dwarf2_finish (void);
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extern int dwarf2dbg_estimate_size_before_relax (fragS *);
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extern int dwarf2dbg_relax_frag (fragS *);
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extern void dwarf2dbg_convert_frag (fragS *);
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extern void dwarf2dbg_final_check (void);
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/* An enumeration which describes the sizes of offsets (to DWARF sections)
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and the mechanism by which the size is indicated. */
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enum dwarf2_format
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{
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/* 32-bit format: the initial length field is 4 bytes long. */
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dwarf2_format_32bit,
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/* DWARF3 64-bit format: the representation of the initial length
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(of a DWARF section) is 0xffffffff (4 bytes) followed by eight
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bytes indicating the actual length. */
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dwarf2_format_64bit,
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/* SGI extension to DWARF2: The initial length is eight bytes. */
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dwarf2_format_64bit_irix
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};
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#endif /* AS_DWARF2DBG_H */
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