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Merge pull request #51 from StanHash/fix-dwarf-debug-line

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(Optional) fix for .debug_line head generation
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luckytyphlosion 2023-04-05 10:05:02 -04:00 committed by GitHub
commit c2e57ee044
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3 changed files with 48 additions and 2 deletions
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41
gcc/dwarf2out.c
View File

@ -232,6 +232,10 @@ static unsigned reg_number (rtx);
#define FDE_AFTER_SIZE_LABEL "LSFDE"
#define FDE_END_LABEL "LEFDE"
#define FDE_LENGTH_LABEL "LLFDE"
#define LINE_NUMBER_BEGIN_LABEL "LSLT"
#define LINE_NUMBER_END_LABEL "LELT"
#define LN_PROLOG_AS_LABEL "LASLTP"
#define LN_PROLOG_END_LABEL "LELTP"
/* Definitions of defaults for various types of primitive assembly language
output operations. These may be overridden from within the tm.h file,
@ -4301,6 +4305,7 @@ output_aranges ()
static void
output_line_info ()
{
char l1[20], l2[20], p1[20], p2[20];
char line_label[MAX_ARTIFICIAL_LABEL_BYTES];
char prev_line_label[MAX_ARTIFICIAL_LABEL_BYTES];
register unsigned opc;
@ -4313,22 +4318,46 @@ output_line_info ()
register unsigned long current_file;
register unsigned long function;
ASM_OUTPUT_DWARF_DATA (asm_out_file, size_of_line_info ());
ASM_GENERATE_INTERNAL_LABEL (l1, LINE_NUMBER_BEGIN_LABEL, 0);
ASM_GENERATE_INTERNAL_LABEL (l2, LINE_NUMBER_END_LABEL, 0);
ASM_GENERATE_INTERNAL_LABEL (p1, LN_PROLOG_AS_LABEL, 0);
ASM_GENERATE_INTERNAL_LABEL (p2, LN_PROLOG_END_LABEL, 0);
if (flag_fixed_debug_line_info)
ASM_OUTPUT_DWARF_DELTA (asm_out_file, l2, l1);
else
ASM_OUTPUT_DWARF_DATA (asm_out_file, size_of_line_info ());
if (flag_debug_asm)
fprintf (asm_out_file, "\t%s Length of Source Line Info.",
ASM_COMMENT_START);
fputc ('\n', asm_out_file);
if (flag_fixed_debug_line_info)
/* start of .debug_line */
ASM_OUTPUT_LABEL(asm_out_file, l1);
ASM_OUTPUT_DWARF_DATA2 (asm_out_file, DWARF_VERSION);
if (flag_debug_asm)
fprintf (asm_out_file, "\t%s DWARF Version", ASM_COMMENT_START);
fputc ('\n', asm_out_file);
ASM_OUTPUT_DWARF_DATA (asm_out_file, size_of_line_prolog ());
if (flag_fixed_debug_line_info)
ASM_OUTPUT_DWARF_DELTA (asm_out_file, p2, p1);
else
ASM_OUTPUT_DWARF_DATA (asm_out_file, size_of_line_prolog ());
if (flag_debug_asm)
fprintf (asm_out_file, "\t%s Prolog Length", ASM_COMMENT_START);
fputc ('\n', asm_out_file);
if (flag_fixed_debug_line_info)
/* start of .debug_line prologue */
ASM_OUTPUT_LABEL(asm_out_file, p1);
ASM_OUTPUT_DWARF_DATA1 (asm_out_file, DWARF_LINE_MIN_INSTR_LENGTH);
if (flag_debug_asm)
fprintf (asm_out_file, "\t%s Minimum Instruction Length",
@ -4423,6 +4452,10 @@ output_line_info ()
ASM_OUTPUT_DWARF_DATA1 (asm_out_file, 0);
fputc ('\n', asm_out_file);
if (flag_fixed_debug_line_info)
/* end of .debug_line prologue */
ASM_OUTPUT_LABEL (asm_out_file, p2);
/* Set the address register to the first location in the text section */
ASM_OUTPUT_DWARF_DATA1 (asm_out_file, 0);
if (flag_debug_asm)
@ -4738,6 +4771,10 @@ output_line_info ()
fputc ('\n', asm_out_file);
}
}
if (flag_fixed_debug_line_info)
/* end of .debug_line */
ASM_OUTPUT_LABEL (asm_out_file, l2);
}
/* Given a pointer to a BLOCK node return non-zero if (and only if) the node

4
gcc/flags.h
View File

@ -450,3 +450,7 @@ extern enum graph_dump_types graph_dump_format;
/* Nonzero if ASM output should use hex instead of decimal. */
extern int flag_hex_asm;
/* Nonzero if generated DWARF debug info should be corrected rather than
match the original (buggy) GCC 2.95.x output. */
extern int flag_fixed_debug_line_info;

5
gcc/toplev.c
View File

@ -585,6 +585,9 @@ int flag_instrument_function_entry_exit = 0;
/* Use hex instead of decimal in ASM output. */
int flag_hex_asm = 0;
/* Fix buggy DWARF line info generation. */
int flag_fixed_debug_line_info = 0;
typedef struct
{
char *string;
@ -724,6 +727,8 @@ lang_independent_options f_options[] =
"Instrument function entry/exit with profiling calls"},
{"hex-asm", &flag_hex_asm, 1,
"Use hex instead of decimal in assembly output"},
{"fix-debug-line", &flag_fixed_debug_line_info, 1,
"Generate fixed DWARF line info"},
};
#define NUM_ELEM(a) (sizeof (a) / sizeof ((a)[0]))