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gas: Use udata for DW_AT_high_pc when emitting DWARF4

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For DWARF4 DW_AT_high_pc can be expressed as constant offset from
DW_AT_low_pc which saves a relocation. Use DW_FORM_udate (uleb128)
to keep the constant value as small as possible.

gas/ChangeLog:

       * dwarf2dbg.c (out_debug_abbrev): When DWARF2_VERSION >= 4, use
       DW_FORM_udata for DW_AT_high_pc.
       (out_debug_info): Use emit_leb128_expr for DW_AT_high_pc, when
       DWARF2_VERSION >= 4.
       * read.c (emit_leb128_exp): No longer static.
       * read.h (emit_leb128_exp): Define.
This commit is contained in:
Mark Wielaard 2020-08-03 22:02:24 +02:00
parent f63d03dde0
commit 6b9a135d72
4 changed files with 16 additions and 4 deletions
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9
gas/ChangeLog
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@ -1,3 +1,12 @@
2020-08-04 Mark Wielaard <mark@klomp.org>
* dwarf2dbg.c (out_debug_abbrev): When DWARF2_VERSION >= 4, use
DW_FORM_udata for DW_AT_high_pc.
(out_debug_info): Use emit_leb128_expr for DW_AT_high_pc, when
DWARF2_VERSION >= 4.
* read.c (emit_leb128_exp): No longer static.
* read.h (emit_leb128_exp): Define.
2020-08-02 Mark Wielaard <mark@klomp.org>
* gas/dwarf2dbg.c (out_dir_and_file_list): For DWARF5 emit at

8
gas/dwarf2dbg.c
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@ -2444,8 +2444,7 @@ out_debug_abbrev (segT abbrev_seg,
if (DWARF2_VERSION < 4)
out_abbrev (DW_AT_high_pc, DW_FORM_addr);
else
out_abbrev (DW_AT_high_pc, (sizeof_address == 4
? DW_FORM_data4 : DW_FORM_data8));
out_abbrev (DW_AT_high_pc, DW_FORM_udata);
}
else
{
@ -2528,7 +2527,10 @@ out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg,
}
exp.X_add_symbol = all_segs->text_end;
exp.X_add_number = 0;
emit_expr (&exp, sizeof_address);
if (DWARF2_VERSION < 4)
emit_expr (&exp, sizeof_address);
else
emit_leb128_expr (&exp, 0);
}
else
{

2
gas/read.c
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@ -5138,7 +5138,7 @@ output_big_leb128 (char *p, LITTLENUM_TYPE *bignum, unsigned int size, int sign)
/* Generate the appropriate fragments for a given expression to emit a
leb128 value. SIGN is 1 for sleb, 0 for uleb. */
static void
void
emit_leb128_expr (expressionS *exp, int sign)
{
operatorT op = exp->X_op;

1
gas/read.h
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@ -132,6 +132,7 @@ extern void emit_expr_with_reloc (expressionS *exp, unsigned int nbytes,
TC_PARSE_CONS_RETURN_TYPE);
extern void emit_expr_fix (expressionS *, unsigned int, fragS *, char *,
TC_PARSE_CONS_RETURN_TYPE);
extern void emit_leb128_expr (expressionS *, int);
extern void equals (char *, int);
extern void float_cons (int);
extern void ignore_rest_of_line (void);