Synchronize libiberty sources with gcc mainline.

	* libiberty: Sync with gcc.  Bring in:
	2019-08-08  Martin Liska  <mliska@suse.cz>

	PR bootstrap/91352
	* lrealpath.c (is_valid_fd): New function.

	2019-07-24  Martin Liska  <mliska@suse.cz>

	PR lto/91228
	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
	Find first '\0' starting from gnu_lto + 1.

	2019-07-12  Ren Kimura  <rkx1209dev@gmail.com>

	* simple-object-elf.c (simple_object_elf_match): Check zero value shstrndx.
	This fixes a Bug 90924.

	2019-07-22  Martin Liska  <mliska@suse.cz>

	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):
	Do not search for gnu_lto_v1, but search for first '\0'.

	2019-07-18  Eduard-Mihai Burtescu  <eddyb@lyken.rs>

	* cplus-dem.c: Include rust-demangle.h.
	* rust-demangle.c: Include rust-demangle.h.
	* rust-demangle.h: New file.

	2019-05-31  Michael Forney  <mforney@mforney.org>

	* cp-demangle.c: Don't define CP_DYNAMIC_ARRAYS if __STDC_NO_VLA__
	is non-zero.

	2019-04-30  Ben L  <bobsayshilol@live.co.uk>

	* d-demangle.c (dlang_parse_assocarray): Correctly handle error result.
	* testsuite/d-demangle-expected: Add testcase.

	* d-demangle.c (dlang_parse_tuple): Correctly handle error result.
	* testsuite/d-demangle-expected: Add testcase.

	* d-demangle.c (dlang_parse_structlit): Correctly handle error result.
	* testsuite/d-demangle-expected: Add testcase.

	* d-demangle.c (dlang_parse_arrayliteral): Correctly handle error result.
	* testsuite/d-demangle-expected: Add testcase.

	* d-demangle.c (dlang_parse_integer): Fix stack underflow.
	* testsuite/d-demangle-expected: Add testcase.

	* cp-demangle (d_print_comp_inner): Guard against a NULL 'typed_name'.
	* testsuite/demangle-expected: Add testcase.

	* cp-demangle.c (d_encoding): Guard against NULL return values from
	d_right (dc).
	* testsuite/demangle-expected: Add testcase.

	2019-04-29  Ben L  <bobsayshilol@live.co.uk>

	* cp-demangle.c (d_expression_1): Don't peek ahead unless the current
	char is valid.
	* testsuite/demangle-expected: Add testcase.

	2019-04-10  Nick Clifton  <nickc@redhat.com>

	PR 89394
	* cp-demangle.c (cplus_demangle_fill_name): Reject negative
	lengths.
	(d_count_templates_scopes): Replace num_templates and num_scopes
	parameters with a struct d_print_info pointer parameter.  Adjust
	body of the function accordingly.  Add recursion counter and check
	that the recursion limit is not reached.
	(d_print_init): Pass dpi parameter to d_count_templates_scopes.
	Reset recursion counter afterwards, unless the recursion limit was
	reached.

1 files changed, 17 insertions, 16 deletions

diff --git a/libiberty/simple-object-elf.c b/libiberty/simple-object-elf.c
index 22c9ae7..7515926 100644
--- a/libiberty/simple-object-elf.c
+++ b/libiberty/simple-object-elf.c
@@ -548,7 +548,15 @@ simple_object_elf_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
       XDELETE (eor);
       return NULL;
     }
-
+  
+  if (eor->shstrndx == 0)
+    {
+      *errmsg = "invalid ELF shstrndx == 0";
+      *err = 0;
+      XDELETE (eor);
+      return NULL;
+    }
+  
   return (void *) eor;
 }
 
@@ -1358,9 +1366,8 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 	  return errmsg;
 	}
 
-      /* If we are processing .symtab purge __gnu_lto_v1 and
-	 __gnu_lto_slim symbols from it and any symbols in discarded
-	 sections.  */
+      /* If we are processing .symtab purge __gnu_lto_slim symbol
+	 from it and any symbols in discarded sections.  */
       if (sh_type == SHT_SYMTAB)
 	{
 	  unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr,
@@ -1380,14 +1387,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 				       sobj->offset + stroff,
 				       (unsigned char *)strings,
 				       strsz, &errmsg, err);
-	  /* Find gnu_lto_ in strings.  */
-	  while ((gnu_lto = (char *) memchr (gnu_lto, 'g',
-					     strings + strsz - gnu_lto)))
-	    if (strncmp (gnu_lto, "gnu_lto_v1",
-			 strings + strsz - gnu_lto) == 0)
-	      break;
-	    else
-	      gnu_lto++;
+	  /* Find first '\0' in strings.  */
+	  gnu_lto = (char *) memchr (gnu_lto + 1, '\0',
+				     strings + strsz - gnu_lto);
 	  /* Read the section index table if present.  */
 	  if (symtab_indices_shndx[i - 1] != 0)
 	    {
@@ -1461,10 +1463,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
 			 undefined and sharing the gnu_lto_ name.  */
 		      bind = STB_WEAK;
 		      other = STV_HIDDEN;
-		      if (gnu_lto)
-			ELF_SET_FIELD (type_functions, ei_class, Sym,
-				       ent, st_name, Elf_Word,
-				       gnu_lto - strings);
+		      ELF_SET_FIELD (type_functions, ei_class, Sym,
+				     ent, st_name, Elf_Word,
+				     gnu_lto - strings);
 		      ELF_SET_FIELD (type_functions, ei_class, Sym,
 				     ent, st_shndx, Elf_Half, SHN_UNDEF);
 		    }