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Add a cache of the text section.

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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
This commit is contained in:
Soren Sandmann
2006-10-08 20:14:25 +00:00
committed by Søren Sandmann Pedersen
parent 86810e63a5
commit 0cf636d8fe
4 changed files with 60 additions and 38 deletions
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61
elfparser.c
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@ -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 *