Remove cleanups from coff-pe-read.c

This removes cleanups from coff-pe-read.c, using std::string,
std::vector, and gdb::def_vector.

Tested by the buildbot, though I'm not sure these code paths are
exercised there.

ChangeLog
2018-05-25  Tom Tromey  <tom@tromey.com>

	* coff-pe-read.c (struct read_pe_section_data) <section_name>: Now
	a std::string.
	(get_pe_section_index, add_pe_exported_sym): Update.
	(read_pe_exported_syms): Use gdb::def_vector.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2018-05-25  Tom Tromey  <tom@tromey.com>
+
+	* coff-pe-read.c (struct read_pe_section_data) <section_name>: Now
+	a std::string.
+	(get_pe_section_index, add_pe_exported_sym): Update.
+	(read_pe_exported_syms): Use gdb::def_vector.
+
 2018-05-25  Tom Tromey  <tom@tromey.com>
 
 	* frame.c (remove_prev_frame): Remove.

gdb/coff-pe-read.c

@@ -54,7 +54,7 @@ struct read_pe_section_data
   enum minimal_symbol_type ms_type;	/* Type to assign symbols in
 					   section.  */
   unsigned int index;		/* BFD section number.  */
-  const char *section_name;	/* Recorded section name.  */
+  std::string section_name;	/* Recorded section name.  */
 };
 
 #define IMAGE_SCN_CNT_CODE 0x20
@@ -106,7 +106,7 @@ get_pe_section_index (const char *section_name,
   int i;
 
   for (i = 0; i < nb_sections; i++)
-    if (strcmp (sections[i].section_name, section_name) == 0)
+    if (sections[i].section_name == section_name)
       return i;
   return PE_SECTION_INDEX_INVALID;
 }
@@ -175,7 +175,8 @@ add_pe_exported_sym (minimal_symbol_reader &reader,
   if ((section_data->ms_type == mst_unknown) && debug_coff_pe_read)
     fprintf_unfiltered (gdb_stdlog , _("Unknown section type for \"%s\""
 			" for entry \"%s\" in dll \"%s\"\n"),
-			section_data->section_name, sym_name, dll_name);
+			section_data->section_name.c_str (), sym_name,
+			dll_name);
 
   reader.record_with_info (qualified_name, vma, section_data->ms_type,
 			   section_data->index);
@@ -349,16 +350,12 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
   /* Array elements are for text, data and bss in that order
      Initialization with RVA_START > RVA_END guarantees that
      unused sections won't be matched.  */
-  struct read_pe_section_data *section_data;
   struct pe_sections_info pe_sections_info;
 
-  struct cleanup *back_to = make_cleanup (null_cleanup, 0);
-
   char const *target = bfd_get_target (objfile->obfd);
 
-  section_data = XCNEWVEC (struct read_pe_section_data, PE_SECTION_TABLE_SIZE);
+  std::vector<struct read_pe_section_data> section_data
-
+    (PE_SECTION_TABLE_SIZE);
-  make_cleanup (free_current_contents, &section_data);
 
   for (i=0; i < PE_SECTION_TABLE_SIZE; i++)
     {
@@ -384,7 +381,6 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
       /* This is not a recognized PE format file.  Abort now, because
 	 the code is untested on anything else.  *FIXME* test on
 	 further architectures and loosen or remove this test.  */
-      do_cleanups (back_to);
       return;
     }
 
@@ -397,10 +393,7 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
     num_entries = pe_get32 (dll, opthdr_ofs + 92);
 
   if (num_entries < 1)		/* No exports.  */
-    {
+    return;
-      do_cleanups (back_to);
-      return;
-    }
   if (is_pe64)
     {
       export_opthdrrva = pe_get32 (dll, opthdr_ofs + 112);
@@ -454,7 +447,6 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
   if (export_size == 0)
     {
       /* Empty export table.  */
-      do_cleanups (back_to);
       return;
     }
 
@@ -490,13 +482,8 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
 	}
       else
 	{
-	  char *name;
+	  section_data.resize (otherix + 1);
-
+	  section_data[otherix].section_name = sec_name;
-	  section_data = XRESIZEVEC (struct read_pe_section_data, section_data,
-				     otherix + 1);
-	  name = xstrdup (sec_name);
-	  section_data[otherix].section_name = name;
-	  make_cleanup (xfree, name);
 	  section_data[otherix].rva_start = vaddr;
 	  section_data[otherix].rva_end = vaddr + vsize;
 	  section_data[otherix].vma_offset = 0;
@@ -513,8 +500,8 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
 	}
     }
 
-  expdata = (unsigned char *) xmalloc (export_size);
+  gdb::def_vector<unsigned char> expdata_storage (export_size);
-  make_cleanup (xfree, expdata);
+  expdata = expdata_storage.data ();
 
   bfd_seek (dll, (file_ptr) expptr, SEEK_SET);
   bfd_bread (expdata, (bfd_size_type) export_size, dll);
@@ -530,7 +517,7 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
   dll_name = (char *) (pe_as32 (expdata + 12) + erva);
 
   pe_sections_info.nb_sections = otherix;
-  pe_sections_info.sections = section_data;
+  pe_sections_info.sections = section_data.data ();
 
   bfd_map_over_sections (dll, get_section_vmas, &pe_sections_info);
 
@@ -596,7 +583,7 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
 
 	      section_found = 1;
 	      add_pe_exported_sym (reader, sym_name, func_rva, ordinal,
-				   section_data + sectix, dll_name, objfile);
+				   &section_data[sectix], dll_name, objfile);
 	      ++nbnormal;
 	      break;
 	    }
@@ -608,7 +595,7 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
 	  if (name_rva == 0)
 	    {
 	      add_pe_exported_sym (reader, NULL, func_rva, ordinal,
-				   section_data, dll_name, objfile);
+				   &section_data[0], dll_name, objfile);
 	      ++nbnormal;
 	    }
 	  else if (debug_coff_pe_read)
@@ -622,8 +609,6 @@ read_pe_exported_syms (minimal_symbol_reader &reader,
     fprintf_unfiltered (gdb_stdlog, _("Finished reading \"%s\", exports %ld,"
 			" forwards %ld, total %ld/%ld.\n"), dll_name, nbnormal,
 			nbforward, nbnormal + nbforward, nexp);
-  /* Discard expdata and section_data.  */
-  do_cleanups (back_to);
 }
 
 /* Extract from ABFD the offset of the .text section.