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gdb: Check for nullptr when computing srcpath

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This fixes a regression caused by commit 0d79cdc494d5:

  $ make check TESTS="gdb.dwarf2/dw2-ranges-base.exp"
  [...]
  ERROR: GDB process no longer exists

This error is caused by an abort during the computation of srcpath
when SYMTAB_DIRNAME (s) == NULL.

Computing srcpath only when SYMTAB_DIRNAME (s) is not NULL fixes this
error. Also change the condition for calling debuginfod_source_query
to include whether srcpath could be computed.

gdb/ChangeLog:

2020-02-27  Aaron Merey  <amerey@redhat.com>

        * source.c (open_source_file): Check for nullptr when computing
        srcpath.
This commit is contained in:
Aaron Merey
2020-02-27 19:07:01 -05:00
parent a1f2ad114c
commit e5da11393a
2 changed files with 7 additions and 2 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2020-02-27 Aaron Merey <amerey@redhat.com>
* source.c (open_source_file): Check for nullptr when computing
srcpath.
2020-02-27 Tom Tromey <tromey@adacore.com> 2020-02-27 Tom Tromey <tromey@adacore.com>
* dwarf2/read.c (struct field_info) <nfields>: Now a method, not a * dwarf2/read.c (struct field_info) <nfields>: Now a method, not a

4
gdb/source.c
View File

@ -1160,7 +1160,7 @@ open_source_file (struct symtab *s)
std::string srcpath; std::string srcpath;
if (IS_ABSOLUTE_PATH (s->filename)) if (IS_ABSOLUTE_PATH (s->filename))
srcpath = s->filename; srcpath = s->filename;
else else if (SYMTAB_DIRNAME (s) != nullptr)
{ {
srcpath = SYMTAB_DIRNAME (s); srcpath = SYMTAB_DIRNAME (s);
srcpath += SLASH_STRING; srcpath += SLASH_STRING;
@ -1170,7 +1170,7 @@ open_source_file (struct symtab *s)
const struct bfd_build_id *build_id = build_id_bfd_get (ofp->obfd); const struct bfd_build_id *build_id = build_id_bfd_get (ofp->obfd);
/* Query debuginfod for the source file. */ /* Query debuginfod for the source file. */
if (build_id != nullptr) if (build_id != nullptr && !srcpath.empty ())
fd = debuginfod_source_query (build_id->data, fd = debuginfod_source_query (build_id->data,
build_id->size, build_id->size,
srcpath.c_str (), srcpath.c_str (),