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Optimize x86/x86-64 disassembler some more. Avoid relocations for string

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table.
This commit is contained in:
Ulrich Drepper
2008-12-31 11:34:47 -08:00
parent 54a6d4b1b6
commit 71696bafdb
3 changed files with 41 additions and 7 deletions
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libcpu/ChangeLog
+10
View File
@@ -1,5 +1,15 @@
2008-12-31 Ulrich Drepper <drepper@redhat.com>
* i386_parse.y (struct argstring): Add off element.
(off_op_str): New global variable.
(print_op_str): Print strings as concatenated strings. Keep track
of index and length. Update ->off element.
(print_op_str_idx): New function.
(instrtable_out): Mark op%d_fct as const.
Emit two tables for the strings: the string itself (op%d_str) and the
index table (op%d_str_idx).
* i386_disasm.c (i386_disasm): Adjust for new op%d_str definition.
* i386_disasm.c [X86_64] (i386_disasm): Handle rex prefix when
printing only prefix.
libcpu/i386_disasm.c
+6 -3
View File
@@ -860,7 +860,8 @@ i386_disasm (const uint8_t **startp, const uint8_t *end, GElf_Addr addr,
{
/* First parameter. */
if (instrtab[cnt].str1 != 0)
ADD_STRING (op1_str[instrtab[cnt].str1]);
ADD_STRING (op1_str
+ op1_str_idx[instrtab[cnt].str1 - 1]);
output_data.opoff1 = (instrtab[cnt].off1_1
+ OFF1_1_BIAS - opoff);
@@ -880,7 +881,8 @@ i386_disasm (const uint8_t **startp, const uint8_t *end, GElf_Addr addr,
{
/* Second parameter. */
if (instrtab[cnt].str2 != 0)
ADD_STRING (op2_str[instrtab[cnt].str2]);
ADD_STRING (op2_str
+ op2_str_idx[instrtab[cnt].str2 - 1]);
output_data.opoff1 = (instrtab[cnt].off2_1
+ OFF2_1_BIAS - opoff);
@@ -900,7 +902,8 @@ i386_disasm (const uint8_t **startp, const uint8_t *end, GElf_Addr addr,
{
/* Third parameter. */
if (instrtab[cnt].str3 != 0)
ADD_STRING (op3_str[instrtab[cnt].str3]);
ADD_STRING (op3_str
+ op3_str_idx[instrtab[cnt].str3 - 1]);
output_data.opoff1 = (instrtab[cnt].off3_1
+ OFF3_1_BIAS - opoff);
libcpu/i386_parse.y
+25 -4
View File
@@ -145,6 +145,7 @@ struct argstring
{
char *str;
int idx;
int off;
};
@@ -1066,18 +1067,32 @@ compare_suf (const void *p1, const void *p2)
static int count_op_str;
static int off_op_str;
static void
print_op_str (const void *nodep, VISIT value,
int level __attribute__ ((unused)))
{
if (value == leaf || value == postorder)
{
fprintf (outfile, " \"%s\",\n", (*(struct argstring **) nodep)->str);
const char *str = (*(struct argstring **) nodep)->str;
fprintf (outfile, "%s\n \"%s",
count_op_str == 0 ? "" : "\\0\"", str);
(*(struct argstring **) nodep)->idx = ++count_op_str;
(*(struct argstring **) nodep)->off = off_op_str;
off_op_str += strlen (str) + 1;
}
}
static void
print_op_str_idx (const void *nodep, VISIT value,
int level __attribute__ ((unused)))
{
if (value == leaf || value == postorder)
printf (" %d,\n", (*(struct argstring **) nodep)->off);
}
static void
print_op_fct (const void *nodep, VISIT value,
int level __attribute__ ((unused)))
@@ -1149,7 +1164,8 @@ instrtable_out (void)
{
/* Functions. */
count_op_str = 0;
fprintf (outfile, "static opfct_t op%d_fct[] =\n{\n NULL,\n", i + 1);
fprintf (outfile, "static const opfct_t op%d_fct[] =\n{\n NULL,\n",
i + 1);
twalk (fct_names[i], print_op_fct);
fputs ("};\n", outfile);
@@ -1157,9 +1173,14 @@ instrtable_out (void)
if (nbitstr[i] != 0)
{
count_op_str = 0;
fprintf (outfile, "static const char *op%d_str[] =\n{\n NULL,\n",
i + 1);
off_op_str = 0;
fprintf (outfile, "static const char op%d_str[] =", i + 1);
twalk (strs[i], print_op_str);
fputs ("\"\n;\n", outfile);
fprintf (outfile, "static const uint8_t op%d_str_idx[] = {\n",
i + 1);
twalk (strs[i], print_op_str_idx);
fputs ("};\n", outfile);
}
}