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[Tinycc-devel] multiple states in parallel?
From: |
Rainer Machne |
Subject: |
[Tinycc-devel] multiple states in parallel? |
Date: |
Tue, 15 May 2007 19:42:36 +0200 |
User-agent: |
Thunderbird 1.5.0.10 (X11/20070302) |
Hi,
I am currently trying to integrate TCC in our software. It so far works
great and we get very nice performance enhancements.
These emails in your archive are related to my problem, I think:
http://lists.gnu.org/archive/html/tinycc-devel/2005-10/msg00047.html
http://lists.gnu.org/archive/html/tinycc-devel/2003-05/msg00003.html
http://lists.gnu.org/archive/html/tinycc-devel/2005-06/msg00024.html
I have to use multiple states (created with tcc_new) in my program, and
it works fine.
Only when the states are freed (with tcc_delete), I get a segmentation
fault, with a glibc error messages, either "munmap_chunk(): invalid
pointer: ..." or " double free or corruption".
As an example I included a second state in the libtcc_test.c program,
see attachment.
I am using the tinycc-rl-1.0.0 branch in Fedora.
Are there any patches for this, yet? Should I use another version of TCC?
Thanks,
Rainer Machne
/*
* Simple Test program for libtcc
*
* libtcc can be useful to use tcc as a "backend" for a code generator.
*/
#include <stdlib.h>
#include <stdio.h>
#include "../libtcc.h"
/* this function is called by the generated code */
int add(int a, int b)
{
return a + b;
}
char my_program2[] = "void simple(int n){printf(\"HELLO WORLD AGAIN %d\\n\",
n);}";
char my_program[] =
"int fib(int n)\n"
"{\n"
" if (n <= 2)\n"
" return 1;\n"
" else\n"
" return fib(n-1) + fib(n-2);\n"
"}\n"
"\n"
"int foo(int n)\n"
"{\n"
" printf(\"Hello World!\\n\");\n"
" printf(\"fib(%d) = %d\\n\", n, fib(n));\n"
" printf(\"add(%d, %d) = %d\\n\", n, 2 * n, add(n, 2 * n));\n"
" return 0;\n"
"}\n";
int main(int argc, char **argv)
{
TCCState *s, *s2;
int (*func)(int);
int (*func2)(int);
unsigned long val, val2;
s = tcc_new();
if (!s) {
fprintf(stderr, "Could not create tcc state\n");
exit(1);
}
/* MUST BE CALLED before any compilation or file loading */
tcc_set_output_type(s, TCC_OUTPUT_MEMORY);
/*tcc_enable_debug(s);*/
tcc_compile_string(s, my_program);
/* as a test, we add a symbol that the compiled program can be
linked with. You can have a similar result by opening a dll
with tcc_add_dll(() and using its symbols directly. */
tcc_add_symbol(s, "add", (unsigned long)&add);
tcc_relocate(s);
tcc_get_symbol(s, &val, "foo");
func = (void *)val;
func(32);
/* add a second state */
s2 = tcc_new();
tcc_set_output_type(s2, TCC_OUTPUT_MEMORY);
tcc_compile_string(s2, my_program2);
tcc_relocate(s2);
tcc_get_symbol(s, &val2, "simple");
func2 = (void *)val2;
func2(30);
tcc_delete(s);
tcc_delete(s2);
return 0;
}
- [Tinycc-devel] multiple states in parallel?,
Rainer Machne <=