Move the rust "{" hack

The DWARF reader has a special case to work around a bug in some
versions of the Rust compiler -- it ignores mangled names that contain
a "{" character.

I noticed that this check should probably be in dw2_linkage_name
rather than only in dwarf2_physname.  The former is called in some
cases that the latter is not.

Also, I noticed that this work is not done for the partial DIE reader,
so this patch adds the check there as well.

gdb/ChangeLog
2020-04-24  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (dw2_linkage_name): Move Rust "{" hack here...
	(dwarf2_physname): ... from here.
	(partial_die_info::read): Add Rust "{" hack.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index e2312778821bc90eaf67a80158444b802d8f8dca..6122e3173c09ca5e9ada44963fbfa97728a1ca8e 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2020-04-24  Tom Tromey  <tom@tromey.com>
+
+       * dwarf2/read.c (dw2_linkage_name): Move Rust "{" hack here...
+       (dwarf2_physname): ... from here.
+       (partial_die_info::read): Add Rust "{" hack.
+
 2020-04-24  Tom Tromey  <tom@tromey.com>
 
        * symtab.h (struct general_symbol_info) <set_demangled_name>: New

diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 86d3a7b7fdbaf35c734f595cbd8c4d3967e59155..a22139480042d14213d73e7d097de522bfdcda6e 100644 (file)
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -10032,6 +10032,12 @@ dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
   if (linkage_name == NULL)
     linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
 
+  /* rustc emits invalid values for DW_AT_linkage_name.  Ignore these.
+     See https://github.com/rust-lang/rust/issues/32925.  */
+  if (cu->language == language_rust && linkage_name != NULL
+      && strchr (linkage_name, '{') != NULL)
+    linkage_name = NULL;
+
   return linkage_name;
 }
 
@@ -10308,12 +10314,6 @@ dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
 
   mangled = dw2_linkage_name (die, cu);
 
-  /* rustc emits invalid values for DW_AT_linkage_name.  Ignore these.
-     See https://github.com/rust-lang/rust/issues/32925.  */
-  if (cu->language == language_rust && mangled != NULL
-      && strchr (mangled, '{') != NULL)
-    mangled = NULL;
-
   /* DW_AT_linkage_name is missing in some cases - depend on what GDB
      has computed.  */
   gdb::unique_xmalloc_ptr<char> demangled;
@@ -18301,6 +18301,11 @@ partial_die_info::read (const struct die_reader_specs *reader,
             assume they will be the same, and we only store the last
             one we see.  */
          linkage_name = DW_STRING (&attr);
+         /* rustc emits invalid values for DW_AT_linkage_name.  Ignore these.
+            See https://github.com/rust-lang/rust/issues/32925.  */
+         if (cu->language == language_rust && linkage_name != NULL
+             && strchr (linkage_name, '{') != NULL)
+           linkage_name = NULL;
          break;
        case DW_AT_low_pc:
          has_low_pc_attr = 1;