Add a cache of the text section.

2006-10-08  Soren Sandmann  <sandmann@redhat.com>

	* elfparser.c (struct ElfParser): Add a cache of the text section.

	* binparser.c (struct BinParser): Add a cache of a bin record to
	get rid of malloc()/free() overhead.

	* elfparser.c (struct ElfSym): Cache the size of the symbol

ChangeLog

@@ -1,3 +1,12 @@
+2006-10-08  Soren Sandmann  <sandmann@redhat.com>
+
+	* elfparser.c (struct ElfParser): Add a cache of the text section.
+
+	* binparser.c (struct BinParser): Add a cache of a bin record to
+	get rid of malloc()/free() overhead.
+
+	* elfparser.c (struct ElfSym): Cache the size of the symbol
+
 2006-10-08  Soren Sandmann <sandmann@redhat.com>
 
 	* elfparser.c: Remove now unused load-address heuristic

binfile.c

@@ -191,9 +191,12 @@ bin_file_new (const char *filename)
 	 * (potential) debug binary
 	 */
 	if (bf->elf)
+	{
 	    bf->text_offset = elf_parser_get_text_offset (bf->elf);
 	
-	bf->elf = find_separate_debug_file (bf->elf, filename); /* find_separate_debug_file (bf->elf, filename); */
+	    bf->elf = find_separate_debug_file (bf->elf, filename);
+	}
+	
 	bf->inode = read_inode (filename);
 	bf->filename = g_strdup (filename);
 	bf->undefined_name = g_strdup_printf ("In file %s", filename);

binparser.c

@@ -35,6 +35,9 @@ struct BinParser
     gsize		offset;
     const guchar *	data;
     gsize		length;
+
+    gboolean		cache_in_use;
+    BinRecord		cache;
 };
 
 BinParser *
@@ -46,6 +49,7 @@ bin_parser_new (const guchar	*data,
     parser->offset = 0;
     parser->data = data;
     parser->length = length;
+    parser->cache_in_use = FALSE;
     
     return parser;
 }
@@ -359,18 +363,33 @@ bin_parser_get_record (BinParser *parser,
 		       BinFormat *format,
 		       gsize      offset)
 {
-    BinRecord *record = g_new0 (BinRecord, 1);
+    BinRecord *record;
+    
+    if (!parser->cache_in_use)
+    {
+	parser->cache_in_use = TRUE;
+	record = &(parser->cache);
+    }
+    else
+    {
+	record = g_new0 (BinRecord, 1);
+    }
+
     record->parser = parser;
     record->index = 0;
     record->offset = offset;
     record->format = format;
+
     return record;
 }
 
 void
 bin_record_free (BinRecord *record)
 {
-    g_free (record);
+    if (record == &(record->parser->cache))
+	record->parser->cache_in_use = FALSE;
+    else
+	g_free (record);
 }
 
 guint64

elfparser.c

@@ -10,6 +10,7 @@ struct ElfSym
 {
     gulong offset;
     gulong address;
+    gulong size;
 };
 
 struct Section
@@ -39,6 +40,8 @@ struct ElfParser
     gsize		sym_strings;
 
     GMappedFile *	file;
+
+    const Section *	text_section;
 };
 
 static gboolean parse_elf_signature (const guchar *data, gsize length,
@@ -176,6 +179,11 @@ parser_new_from_data (const guchar *data, gsize length)
 	
 	parser->sections[i] = section_new (shn_entry, section_names);
     }
+
+    /* Cache the text section */
+    parser->text_section = find_section (parser, ".text", SHT_PROGBITS);
+    if (!parser->text_section)
+	parser->text_section = find_section (parser, ".text", SHT_NOBITS);
     
     bin_record_free (shn_entry);
 
@@ -208,6 +216,14 @@ elf_parser_new (const char *filename,
 
     parser = parser_new_from_data (data, length);
 
+    if (!parser)
+    {
+	g_mapped_file_free (file);
+	return NULL;
+    }
+    
+    parser->file = file;
+
 #if 0
     g_print ("Elf file: %s  (debug: %s)\n",
 	     filename, elf_parser_get_debug_link (parser, NULL));
@@ -420,6 +436,8 @@ read_table (ElfParser *parser,
 	{
 	    parser->symbols[n_functions].address = addr;
 	    parser->symbols[n_functions].offset = offset;
+	    parser->symbols[n_functions].size =
+		bin_record_get_uint (symbol, "st_size");
 
 #if 0
 	    g_print ("name: %s\n",
@@ -531,7 +549,6 @@ const ElfSym *
 elf_parser_lookup_symbol (ElfParser *parser,
 			  gulong     address)
 {
-    const Section *text;
     const ElfSym *result;
     gsize size;
     
@@ -541,15 +558,10 @@ elf_parser_lookup_symbol (ElfParser *parser,
     if (parser->n_symbols == 0)
 	return NULL;
 
-    text = find_section (parser, ".text", SHT_PROGBITS);
-    if (!text)
-    {
-	text = find_section (parser, ".text", SHT_NOBITS);
-	if (!text)
-	    return NULL;
-    }
+    if (!parser->text_section)
+	return NULL;
     
-    address += text->load_address;
+    address += parser->text_section->load_address;
 
 #if 0
     g_print ("the address we are looking up is %p\n", address);
@@ -564,21 +576,8 @@ elf_parser_lookup_symbol (ElfParser *parser,
     }
 #endif
 
-    if (result)
-    {
-	BinRecord *symbol;
-	
-	/* Check that address is actually within the function */
-	symbol = bin_parser_get_record (parser->parser,
-					parser->sym_format, result->offset);
-	
-	size = bin_record_get_uint (symbol, "st_size");
-	
-	if (result->address + size <= address)
-	    result = NULL;
-	
-	bin_record_free (symbol);
-    }
+    if (result && result->address + result->size <= address)
+	result = NULL;
 
     return result;
 }
@@ -586,20 +585,12 @@ elf_parser_lookup_symbol (ElfParser *parser,
 gulong
 elf_parser_get_text_offset (ElfParser *parser)
 {
-    const Section *text;
-
     g_return_val_if_fail (parser != NULL, (gulong)-1);
-    
-    text = find_section (parser, ".text", SHT_PROGBITS);
 
-    if (!text)
-    {
-	text = find_section (parser, ".text", SHT_NOBITS);
-	if (!text)
-	    return (gulong)-1;
-    }
+    if (!parser->text_section)
+	return (gulong)-1;
 
-    return text->offset;
+    return parser->text_section->offset;
 }
 
 const char *