* [Bug symtab/28221] [readnow, stabs] FAIL: gdb.dwarf2/dw2-ranges.exp: info line func
2021-08-11 13:02 [Bug symtab/28221] New: [readnow, stabs] FAIL: gdb.dwarf2/dw2-ranges.exp: info line func vries at gcc dot gnu.org
@ 2021-08-11 13:02 ` vries at gcc dot gnu.org
2021-08-11 14:22 ` vries at gcc dot gnu.org
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From: vries at gcc dot gnu.org @ 2021-08-11 13:02 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Hack that makes the test pass:
...
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index cf35880b509..7fd570cf515 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -1896,10 +1896,13 @@ read_dbx_symtab (minimal_symbol_reader &reader,
: lowest_text_address)
+ text_size;
+ if (pst->raw_text_high() == pst->raw_text_low ())
+ pst->set_text_high (pst->raw_text_low () + 1);
+
dbx_end_psymtab (objfile, partial_symtabs,
pst, psymtab_include_list, includes_used,
symnum * symbol_size,
- (text_end > pst->raw_text_high ()
+ (text_end < pst->raw_text_high ()
? text_end : pst->raw_text_high ()),
dependency_list, dependencies_used, textlow_not_set);
}
...
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2021-08-11 13:02 ` [Bug symtab/28221] " vries at gcc dot gnu.org
@ 2021-08-11 14:22 ` vries at gcc dot gnu.org
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From: vries at gcc dot gnu.org @ 2021-08-11 14:22 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Passes with:
...
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-ranges.exp
b/gdb/testsuite/gdb.dwarf2/dw2-ranges.exp
index 8566e0034cf..2da3308e661 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-ranges.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-ranges.exp
@@ -52,11 +52,7 @@ if {[gdb_compile "${srcdir}/${subdir}/${srcfile2}"
"${asmfile2}" assembly {}] !=
return -1
}
-# STABS compilation is intentional as it tests the STABS lookup where is no
-# partial_symtab->psymtabs_addrmap supported for that CU (Compilation Unit) in
-# a file containing psymtabs_addrmap-supporting DWARF CUs.
-if {[gdb_compile "${srcdir}/${subdir}/${srcfile3}" "${asmfile3}" assembly {}]
!= ""
- || [gdb_compile "${asmfile3}" "${objfile3}" object
{additional_flags=-gstabs}] != "" } {
+if {[gdb_compile "${srcdir}/${subdir}/${srcfile3}" "${objfile3}" object
{additional_flags=-gstabs}] != "" } {
return -1
}
...
So this seems again an issue with gas-generated stabs.
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2021-08-11 13:02 ` [Bug symtab/28221] " vries at gcc dot gnu.org
2021-08-11 14:22 ` vries at gcc dot gnu.org
@ 2021-08-14 6:25 ` vries at gcc dot gnu.org
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From: vries at gcc dot gnu.org @ 2021-08-14 6:25 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #2)
> So this seems again an issue with gas-generated stabs.
Indeed, the compiler-generated stabs look like:
...
28 SLINE 0 19 0000000000000000 0
29 SLINE 0 20 0000000000000004 0
30 SO 0 0 00000000004004b0 0
...
so they contain an end address.
Looking at the assembly file, that's generated from:
...
.stabs "",100,0,0,.Letext0
.Letext0:
...
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From: vries at gcc dot gnu.org @ 2021-08-14 6:28 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #3)
> Indeed, the compiler-generated stabs look like:
And the gas-generated stabs:
...
Contents of .stab section:
Symnum n_type n_othr n_desc n_value n_strx String
-1 HdrSym 0 6 0000000000000051 1
0 SO 0 0 00000000004004a9 1
/home/vries/gdb/build/gdb/testsuite/outputs/gdb.dwarf2/dw2-ranges/dw2-ranges3.s
1 SLINE 0 8 00000000004004a9 0
2 SLINE 0 11 00000000004004aa 0
3 SLINE 0 13 00000000004004ad 0
4 SLINE 0 14 00000000004004ae 0
5 SLINE 0 16 00000000004004af 0
...
ends with SLINE instead, so the end-of-text-section is used as CU end address.
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From: vries at gcc dot gnu.org @ 2021-08-14 12:15 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
With this patch:
...
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-ranges.exp
b/gdb/testsuite/gdb.dwarf2/dw2-ranges.exp
index 8566e0034cf..360e3590e29 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-ranges.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-ranges.exp
@@ -36,6 +36,7 @@ standard_testfile .c -2.c -3.c
set asmfile [standard_output_file ${testfile}.s]
set asmfile2 [standard_output_file ${testfile}2.s]
set asmfile3 [standard_output_file ${testfile}3.s]
+set asmfiletmp [standard_output_file ${testfile}tmp.s]
set objfile [standard_output_file ${testfile}.o]
set objfile2 [standard_output_file ${testfile}2.o]
set objfile3 [standard_output_file ${testfile}3.o]
@@ -55,8 +56,16 @@ if {[gdb_compile "${srcdir}/${subdir}/${srcfile2}"
"${asmfile2}" assembly {}] !=
# STABS compilation is intentional as it tests the STABS lookup where is no
# partial_symtab->psymtabs_addrmap supported for that CU (Compilation Unit) in
# a file containing psymtabs_addrmap-supporting DWARF CUs.
-if {[gdb_compile "${srcdir}/${subdir}/${srcfile3}" "${asmfile3}" assembly {}]
!= ""
- || [gdb_compile "${asmfile3}" "${objfile3}" object
{additional_flags=-gstabs}] != "" } {
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile3}" "${asmfiletmp}" assembly
{}] != "" } {
+ return -1
+}
+
+exec echo ".func main3" > $asmfile3
+exec sed -i "s/.*GNU-stack.*//" $asmfiletmp
+exec cat $asmfiletmp >> $asmfile3
+exec echo ".endfunc" >> $asmfile3
+
+if { [gdb_compile "${asmfile3}" "${objfile3}" object
{additional_flags=-gstabs}] != "" } {
return -1
}
...
I get:
...
.func main3
.file "dw2-ranges-3.c"
.text
.globl main3
.type main3, @function
main3:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
nop
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size main3, .-main3
.ident "GCC: (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0"
.endfunc
...
and:
...
Contents of .stab section:
Symnum n_type n_othr n_desc n_value n_strx String
-1 HdrSym 0 9 0000000000000064 1
0 SO 0 0 00000000004004a9 1
/home/vries/gdb/build/gdb/testsuite/outputs/gdb.dwarf2/dw2-ranges/dw2-ranges3.s
1 LSYM 0 0 0000000000000000 81 void:t1=1
2 FUN 0 2 00000000004004a9 91 main3:F1
3 SLINE 0 9 0000000000000000 0
4 SLINE 0 12 0000000000000001 0
5 SLINE 0 14 0000000000000004 0
6 SLINE 0 15 0000000000000005 0
7 SLINE 0 17 0000000000000006 0
8 FUN 0 0 0000000000000007 0
...
and the test still fails.
Possibly because the terminating FUN uses relative address? The
compiler-generated version uses absolute address.
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From: vries at gcc dot gnu.org @ 2021-08-14 13:24 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #5)
> Possibly because the terminating FUN uses relative address? The
> compiler-generated version uses absolute address.
I'd like to try:
...
diff --git a/gas/stabs.c b/gas/stabs.c
index 8da1147c561..c9e8b886ef9 100644
--- a/gas/stabs.c
+++ b/gas/stabs.c
@@ -692,7 +692,7 @@ stabs_generate_asm_endfunc (const char *funcname
ATTRIBUTE_UNUSED,
++label_count;
colon (sym);
- if (asprintf (&buf, "\"\",%d,0,0,%s-%s", N_FUN, sym, startlabname) == -1)
+ if (asprintf (&buf, "\"\",%d,0,0,%s", N_FUN, sym) == -1)
as_fatal ("%s", xstrerror (errno));
temp_ilp (buf);
...
but on my ubuntu 18.04.5 setup I can't use current gas with the gdb test-case,
because I run into:
...
gdb compile failed, /usr/bin/ld: warning:
/home/vries/gdb/build/gdb/testsuite/outputs/gdb.dwarf2/dw2-ranges/dw2-ranges.o:
unsupported GNU_PROPERTY_TYPE (5) type: 0xc0010002
...
Maybe a question of ubuntu/debian-specific patches, maybe the version is too
new.
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From: vries at gcc dot gnu.org @ 2021-08-14 14:26 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
Tentative gas patch, fixes PR:
...
diff --git a/gas/read.c b/gas/read.c
index 7bf52f11218..d75815fb99a 100644
--- a/gas/read.c
+++ b/gas/read.c
@@ -248,6 +248,7 @@ static segT get_known_segmented_expression (expressionS *
expP);
static void pobegin (void);
static size_t get_non_macro_line_sb (sb *);
static void generate_file_debug (void);
+static void generate_file_debug_end (void);
static char *_find_end_of_line (char *, int, int, int);
^L
void
@@ -1363,6 +1364,8 @@ read_a_source_file (const char *name)
}
quit:
+ generate_file_debug_end ();
+
symbol_set_value_now (&dot_symbol);
#ifdef HANDLE_BUNDLE
@@ -6066,6 +6069,13 @@ generate_file_debug (void)
stabs_generate_asm_file ();
}
+static void
+generate_file_debug_end (void)
+{
+ if (debug_type == DEBUG_STABS)
+ stabs_generate_asm_file_end ();
+}
+
/* Output line number debugging information for the current source line. */
void
diff --git a/gas/read.h b/gas/read.h
index eebdc4e7452..651f0701bf0 100644
--- a/gas/read.h
+++ b/gas/read.h
@@ -144,6 +144,7 @@ extern void read_print_statistics (FILE *);
extern char *read_symbol_name (void);
extern unsigned sizeof_leb128 (valueT, int);
extern void stabs_generate_asm_file (void);
+extern void stabs_generate_asm_file_end (void);
extern void stabs_generate_asm_lineno (void);
extern void stabs_generate_asm_func (const char *, const char *);
extern void stabs_generate_asm_endfunc (const char *, const char *);
diff --git a/gas/stabs.c b/gas/stabs.c
index 73d1361423c..946831d9c18 100644
--- a/gas/stabs.c
+++ b/gas/stabs.c
@@ -502,6 +502,13 @@ stabs_generate_asm_file (void)
generate_asm_file (N_SO, file);
}
+void
+stabs_generate_asm_file_end (void)
+{
+ subseg_set (text_section, 0);
+ generate_asm_file (N_SO, "");
+}
+
/* Generate stabs debugging information to denote the source file.
TYPE is one of N_SO, N_SOL. */
...
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From: vries at gcc dot gnu.org @ 2021-08-14 14:29 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #7)
> Tentative gas patch, fixes PR:
With which we have (with .exp modification to add .func prefix):
...
$ objdump -G outputs/gdb.dwarf2/dw2-ranges/dw2-ranges
outputs/gdb.dwarf2/dw2-ranges/dw2-ranges: file format elf64-x86-64
Contents of .stab section:
Symnum n_type n_othr n_desc n_value n_strx String
-1 HdrSym 0 9 0000000000000064 1
0 SO 0 0 00000000004004a9 1
/home/vries/gdb/build/gdb/testsuite/outputs/gdb.dwarf2/dw2-ranges/dw2-ranges3.s
1 LSYM 0 0 0000000000000000 81 void:t1=1
2 FUN 0 2 00000000004004a9 91 main3:F1
3 SLINE 0 9 0000000000000000 0
4 SLINE 0 12 0000000000000001 0
5 SLINE 0 14 0000000000000004 0
6 SLINE 0 15 0000000000000005 0
7 SLINE 0 17 0000000000000006 0
8 SO 0 0 00000000004004b0 0
...
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From: vries at gcc dot gnu.org @ 2021-08-16 7:24 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #9 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #7)
> Tentative gas patch, fixes PR:
Filed at PR28233 - "[gas, --gstabs] Generate stabs more similar to gcc"
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From: cvs-commit at gcc dot gnu.org @ 2021-08-23 10:08 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
--- Comment #10 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=74cdc3e0888f1ffc3973a4826e85dd32e5a51037
commit 74cdc3e0888f1ffc3973a4826e85dd32e5a51037
Author: Tom de Vries <tdevries@suse.de>
Date: Mon Aug 23 12:08:25 2021 +0200
[gdb/testsuite] Use compiler-generated instead of gas-generated stabs
The test-case gdb.dwarf2/dw2-ranges.exp is the only one in the gdb
testsuite
that uses gas-generated stabs.
While the use seems natural alongside the use of gas-generated dwarf in the
same test-case, there are a few known issues, filed on the gdb side as:
- PR symtab/12497 - "stabs: PIE relocation does not work"
- PR symtab/28221 - "[readnow, stabs] FAIL: gdb.dwarf2/dw2-ranges.exp: \
info line func"
and on the gas side as:
- PR gas/28233 - "[gas, --gstabs] Generate stabs more similar to gcc"
The test-case contains a KFAIL for PR12497, but it's outdated and fails to
trigger.
The intention of the test-case is to test gas-generated dwarf, and using
gcc-generated stabs instead of gas-generated stabs works fine.
Supporting compiler-generated stabs is already a corner-case for gdb, and
there's no current commitment/incentive to support/workaround gas-generated
stabs, which can be considered a corner-case of a corner-case.
Work around these problem by using compiler-generated stabs in the
test-case.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2021-08-22 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/dw2-ranges.exp: Use compiler-generated stabs.
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From: vries at gcc dot gnu.org @ 2021-08-24 6:39 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28221
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |WONTFIX
Summary|[readnow, stabs] FAIL: |[readnow, gas-stabs] FAIL:
|gdb.dwarf2/dw2-ranges.exp: |gdb.dwarf2/dw2-ranges.exp:
|info line func |info line func
Status|NEW |RESOLVED
--- Comment #11 from Tom de Vries <vries at gcc dot gnu.org> ---
The test-case has been updated to not use gas-generated stabs anymore.
I'm marking this PR resolved-wontfix.
If there's follow-up on PR gas/28233, we can re-introduce gas-generates stabs
to the test-case, using an axis stabs_method=[list compiler assembler].
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