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Use inlined func name for printing breakpoints (RH BZ 1228556, Keith Seitz).

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This commit is contained in:
Jan Kratochvil 2017-10-27 21:07:50 +02:00
parent d614670f9d
commit f408ba821f
3 changed files with 358 additions and 1 deletions
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136
gdb-rhbz1228556-bpt-inlined-func-name-1of2.patch Normal file
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@ -0,0 +1,136 @@
commit 06871ae84096ed1672eb76f44cea4d5dbe79ae24
Author: Pedro Alves <palves@redhat.com>
Date: Wed Sep 20 16:12:54 2017 +0100
Make "list ambiguous" show symbol names too
Currently, with an ambiguous "list first,last", we get:
(gdb) list bar,main
Specified first line 'bar' is ambiguous:
file: "src/gdb/testsuite/gdb.cp/overload.cc", line number: 97
file: "src/gdb/testsuite/gdb.cp/overload.cc", line number: 98
This commit makes gdb's output above a bit clearer by printing the
symbol name as well:
(gdb) list bar,main
Specified first line 'bar' is ambiguous:
file: "src/gdb/testsuite/gdb.cp/overload.cc", line number: 97, symbol: "bar(A)"
file: "src/gdb/testsuite/gdb.cp/overload.cc", line number: 98, symbol: "bar(B)"
And while at it, makes gdb print the symbol name when actually listing
multiple locations too. I.e., before (with "set listsize 2"):
(gdb) list bar
file: "src/gdb/testsuite/gdb.cp/overload.cc", line number: 97
96
97 int bar (A) { return 11; }
file: "src/gdb/testsuite/gdb.cp/overload.cc", line number: 98
97 int bar (A) { return 11; }
98 int bar (B) { return 22; }
After:
(gdb) list bar
file: "src/gdb/testsuite/gdb.cp/overload.cc", line number: 97, symbol: "bar(A)"
96
97 int bar (A) { return 11; }
file: "src/gdb/testsuite/gdb.cp/overload.cc", line number: 98, symbol: "bar(B)"
97 int bar (A) { return 11; }
98 int bar (B) { return 22; }
Currently, the result of decoding a linespec loses information about
the original symbol that was found. All we end up with is an address.
This makes it difficult to find the original symbol again to get at
its print name. Fix that by storing a pointer to the symbol in the
sal. We already store the symtab and obj_section, so it feels like a
natural progression to me. This avoids having to do any extra symbol
lookup too.
gdb/ChangeLog:
2017-09-20 Pedro Alves <palves@redhat.com>
* cli/cli-cmds.c (list_command): Use print_sal_location.
(print_sal_location): New function.
(ambiguous_line_spec): Use print_sal_location.
* linespec.c (symbol_to_sal): Record the symbol in the sal.
* symtab.c (find_function_start_sal): Likewise.
* symtab.h (symtab_and_line::symbol): New field.
gdb/testsuite/ChangeLog:
2017-09-20 Pedro Alves <palves@redhat.com>
* gdb.base/list-ambiguous.exp (test_list_ambiguous_symbol): Expect
symbol names in gdb's output.
* gdb.cp/overload.exp ("list all overloads"): Likewise.
### a/gdb/ChangeLog
### b/gdb/ChangeLog
## -1,5 +1,14 @@
2017-09-20 Pedro Alves <palves@redhat.com>
+ * cli/cli-cmds.c (list_command): Use print_sal_location.
+ (print_sal_location): New function.
+ (ambiguous_line_spec): Use print_sal_location.
+ * linespec.c (symbol_to_sal): Record the symbol in the sal.
+ * symtab.c (find_function_start_sal): Likewise.
+ * symtab.h (symtab_and_line::symbol): New field.
+
+2017-09-20 Pedro Alves <palves@redhat.com>
+
* linespec.c (minsym_found): Handle non-text minsyms.
(symbol_to_sal): Record a sal.pc for non-block, non-label symbols.
Index: gdb-8.0.1/gdb/linespec.c
===================================================================
--- gdb-8.0.1.orig/gdb/linespec.c 2017-10-20 21:28:18.444609776 +0200
+++ gdb-8.0.1/gdb/linespec.c 2017-10-20 21:29:12.382094104 +0200
@@ -3864,6 +3864,7 @@
{
init_sal (result);
result->symtab = symbol_symtab (sym);
+ result->symbol = sym;
result->line = SYMBOL_LINE (sym);
result->pc = SYMBOL_VALUE_ADDRESS (sym);
result->pspace = SYMTAB_PSPACE (result->symtab);
@@ -3879,6 +3880,7 @@
/* We know its line number. */
init_sal (result);
result->symtab = symbol_symtab (sym);
+ result->symbol = sym;
result->line = SYMBOL_LINE (sym);
result->pspace = SYMTAB_PSPACE (result->symtab);
return 1;
Index: gdb-8.0.1/gdb/symtab.c
===================================================================
--- gdb-8.0.1.orig/gdb/symtab.c 2017-10-20 21:28:18.446609794 +0200
+++ gdb-8.0.1/gdb/symtab.c 2017-10-20 21:29:51.390444377 +0200
@@ -3478,6 +3478,7 @@
fixup_symbol_section (sym, NULL);
section = SYMBOL_OBJ_SECTION (symbol_objfile (sym), sym);
sal = find_pc_sect_line (BLOCK_START (SYMBOL_BLOCK_VALUE (sym)), section, 0);
+ sal.symbol = sym;
if (funfirstline && sal.symtab != NULL
&& (COMPUNIT_LOCATIONS_VALID (SYMTAB_COMPUNIT (sal.symtab))
@@ -3501,6 +3502,7 @@
sal.pspace = current_program_space;
sal.pc = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
sal.section = section;
+ sal.symbol = sym;
}
if (funfirstline)
Index: gdb-8.0.1/gdb/symtab.h
===================================================================
--- gdb-8.0.1.orig/gdb/symtab.h 2017-10-20 21:28:21.205634569 +0200
+++ gdb-8.0.1/gdb/symtab.h 2017-10-20 21:28:40.933811716 +0200
@@ -1420,6 +1420,7 @@
struct program_space *pspace;
struct symtab *symtab;
+ struct symbol *symbol = NULL;
struct obj_section *section;
/* Line number. Line numbers start at 1 and proceed through symtab->nlines.
0 is never a valid line number; it is used to indicate that line number

212
gdb-rhbz1228556-bpt-inlined-func-name-2of2.patch Normal file
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@ -0,0 +1,212 @@
commit 4a27f119f59a44395e0a34b1526cee709e1d3fce
Author: Keith Seitz <keiths@redhat.com>
Date: Fri Oct 27 10:57:23 2017 -0700
Use SaL symbol name when reporting breakpoint locations
Currently, "info break" can show some (perhaps) unexpected results when
setting a breakpoint on an inlined function:
(gdb) list
1 #include <stdio.h>
2
3 static inline void foo()
4 {
5 printf("Hello world\n");
6 }
7
8 int main()
9 {
10 foo();
11 return 0;
12 }
13
(gdb) b foo
Breakpoint 1 at 0x400434: file foo.c, line 5.
(gdb) i b
Num Type Disp Enb Address What
1 breakpoint keep y 0x0000000000400434 in main at foo.c:5
GDB reported that we understood what "foo" was, but we then report that the
breakpoint is actually set in main. While that is literally true, we can
do a little better.
This is accomplished by copying the symbol for which the breakpoint was set
into the bp_location. From there, print_breakpoint_location can use this
information to print out symbol information (if available) instead of calling
find_pc_sect_function.
With the patch installed,
(gdb) i b
Num Type Disp Enb Address What
1 breakpoint keep y 0x0000000000400434 in foo at foo.c:5
gdb/ChangeLog:
* breakpoint.c (print_breakpoint_location): Use the symbol saved
in the bp_location, falling back to find_pc_sect_function when
needed.
(add_location_to_breakpoint): Save sal->symbol.
* breakpoint.h (struct bp_location) <symbol>: New field.
* symtab.c (find_function_start_sal): Save the symbol into the SaL.
* symtab.h (struct symtab_and_line) <symbol>: New field.
gdb/testsuite/ChangeLog:
* gdb.opt/inline-break.exp (break_info_1): New procedure.
Test "info break" for every inlined function breakpoint.
### a/gdb/ChangeLog
### b/gdb/ChangeLog
## -1,3 +1,13 @@
+2017-10-27 Keith Seitz <keiths@redhat.com>
+
+ * breakpoint.c (print_breakpoint_location): Use the symbol saved
+ in the bp_location, falling back to find_pc_sect_function when
+ needed.
+ (add_location_to_breakpoint): Save sal->symbol.
+ * breakpoint.h (struct bp_location) <symbol>: New field.
+ * symtab.c (find_function_start_sal): Save the symbol into the SaL.
+ * symtab.h (struct symtab_and_line) <symbol>: New field.
+
2017-10-26 Patrick Frants <osscontribute@gmail.com>
PR gdb/13669
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -5956,8 +5956,11 @@ print_breakpoint_location (struct breakpoint *b,
uiout->field_string ("what", event_location_to_string (b->location.get ()));
else if (loc && loc->symtab)
{
- struct symbol *sym
- = find_pc_sect_function (loc->address, loc->section);
+ const struct symbol *sym = loc->symbol;
+
+ if (sym == NULL)
+ sym = find_pc_sect_function (loc->address, loc->section);
+
if (sym)
{
uiout->text ("in ");
@@ -8743,6 +8746,7 @@ add_location_to_breakpoint (struct breakpoint *b,
loc->gdbarch = loc_gdbarch;
loc->line_number = sal->line;
loc->symtab = sal->symtab;
+ loc->symbol = sal->symbol;
set_breakpoint_location_function (loc,
sal->explicit_pc || sal->explicit_line);
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -486,6 +486,11 @@ public:
to find the corresponding source file name. */
struct symtab *symtab;
+
+ /* The symbol found by the location parser, if any. This may be used to
+ ascertain when an event location was set at a different location than
+ the one originally selected by parsing, e.g., inlined symbols. */
+ const struct symbol *symbol = NULL;
};
/* The possible return values for print_bpstat, print_it_normal,
### a/gdb/testsuite/ChangeLog
### b/gdb/testsuite/ChangeLog
## -1,3 +1,8 @@
+2017-10-27 Keith Seitz <keiths@redhat.com>
+
+ * gdb.opt/inline-break.exp (break_info_1): New procedure.
+ Test "info break" for every inlined function breakpoint.
+
2017-10-27 Yao Qi <yao.qi@linaro.org>
* gdb.arch/insn-reloc.c (can_relocate_bl): Mark "x30" clobbered.
--- a/gdb/testsuite/gdb.opt/inline-break.exp
+++ b/gdb/testsuite/gdb.opt/inline-break.exp
@@ -24,6 +24,62 @@ if { [prepare_for_testing "failed to prepare" $testfile $srcfile \
return -1
}
+# Return a string that may be used to match the output of "info break NUM".
+#
+# Optional arguments:
+#
+# source - the name of the source file
+# func - the name of the function
+# disp - the event disposition
+# enabled - enable state
+# locs - number of locations
+# line - source line number (ignored without -source)
+
+proc break_info_1 {num args} {
+ global decimal
+
+ # Column delimiter
+ set c {[\t ]+}
+
+ # Row delimiter
+ set end {[\r\n \t]+}
+
+ # Table header
+ set header "[join [list Num Type Disp Enb Address What] ${c}]"
+
+ # Get/configure any optional parameters.
+ parse_args [list {source ""} {func ".*"} {disp "keep"} \
+ {enabled "y"} {locs 1} [list line $decimal] \
+ {type "breakpoint"}]
+
+ if {$source != ""} {
+ set source "$source:$line"
+ }
+
+ # Result starts with the standard header.
+ set result "$header${end}"
+
+ # Set up for multi-location breakpoint marker.
+ if {$locs == 1} {
+ set multi ".*"
+ } else {
+ set multi "<MULTIPLE>${end}"
+ }
+ append result "[join [list $num $type $disp $enabled $multi] $c]"
+
+ # Add location info.
+ for {set i 1} {$i <= $locs} {incr i} {
+ if {$locs > 1} {
+ append result "[join [list $num.$i $enabled] $c].*"
+ }
+
+ # Add function/source file info.
+ append result "in $func at .*$source${end}"
+ }
+
+ return $result
+}
+
#
# func1 is a static inlined function that is called once.
# The result should be a single-location breakpoint.
@@ -111,3 +167,22 @@ gdb_test "print func1" \
#
gdb_test "print func2" \
"\\\$.* = {int \\(int\\)} .* <func2>"
+
+# Test that "info break" reports the location of the breakpoints "inside"
+# the inlined functions
+
+set results(1) [break_info_1 1 -source $srcfile -func "func1"]
+set results(2) [break_info_1 2 -locs 2 -source $srcfile -func "func2"]
+set results(3) [break_info_1 3 -source $srcfile -func "func3b"]
+set results(4) [break_info_1 4 -locs 2 -source $srcfile -func "func4b"]
+set results(5) [break_info_1 5 -locs 2 -source $srcfile -func "func5b"]
+set results(6) [break_info_1 6 -locs 3 -source $srcfile -func "func6b"]
+set results(7) [break_info_1 7 -locs 2 -source $srcfile -func "func7b"]
+set results(8) [break_info_1 8 -locs 3 -source $srcfile -func "func8b"]
+
+for {set i 1} {$i <= [array size results]} {incr i} {
+ send_log "Expecting: $results($i)\n"
+ gdb_test "info break $i" $results($i)
+}
+
+unset -nocomplain results

11
gdb.spec
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@ -26,7 +26,7 @@ Version: 8.0.1
# The release always contains a leading reserved number, start it at 1.
# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
Release: 29%{?dist}
Release: 30%{?dist}
License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and LGPLv3+ and BSD and Public Domain and GFDL
Group: Development/Debuggers
@ -733,6 +733,10 @@ Patch1257: gdb-rhbz1498758-3of5.patch
Patch1258: gdb-rhbz1498758-4of5.patch
Patch1259: gdb-rhbz1498758-5of5.patch
# Use inlined func name for printing breakpoints (RH BZ 1228556, Keith Seitz).
Patch1261: gdb-rhbz1228556-bpt-inlined-func-name-1of2.patch
Patch1262: gdb-rhbz1228556-bpt-inlined-func-name-2of2.patch
%if 0%{!?rhel:1} || 0%{?rhel} > 6
# RL_STATE_FEDORA_GDB would not be found for:
# Patch642: gdb-readline62-ask-more-rh.patch
@ -1145,6 +1149,8 @@ done
%patch1257 -p1
%patch1258 -p1
%patch1259 -p1
%patch1261 -p1
%patch1262 -p1
%patch1075 -p1
%if 0%{?rhel:1} && 0%{?rhel} <= 7
@ -1727,6 +1733,9 @@ then
fi
%changelog
* Fri Oct 27 2017 Jan Kratochvil <jan.kratochvil@redhat.com> - 8.0.1-30.fc26
- Use inlined func name for printing breakpoints (RH BZ 1228556, Keith Seitz).
* Sat Oct 7 2017 Jan Kratochvil <jan.kratochvil@redhat.com> - 8.0.1-29.fc26
- [s390x] Backport arch14 guarded-storage register support (RH BZ 1498758).