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1fe3e3bff5
I tried several gdb/lldb options to debug libtcc generated code. But gdb/lldb complained that they could not load symbols or that module does not exist. There was also another problem. The code itself was in memory (string) and gdb/lldb do not have functions to acces it. So I came up with a new api for debugging libtcc code. First you enable debugging with: tcc_set_options(s, "-g") Then compile the code with: tcc_compile_string_file(s, program, "<file>.c") Then call tcc_relocate(). And finaly write the object file to disk: elf_output_obj(s, "<file>.o") Now you can start the debugger and put an breakpoint after the elf_output_obj() code. Then use gdb command add-symbol-file <file>.o and from there on you can set breakpoints in the libtcc generated code. You can also step/print variables/... I could not find a simular function in lldb yet. When debugging is done you remove the tcc_set_options(s, "-g"). All other code can remain because tcc_compile_string_file and elf_output_obj do not output any file any more is debug is not set. See also tests/libtcc_debug.c
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libtcc.h"
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static const char program[] =
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"#include <stdio.h>\n"
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"int fib(int n)\n"
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"{\n"
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" if (n <= 2)\n"
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" return 1;\n"
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" else\n"
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" return fib(n-1) + fib(n-2);\n"
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"}\n"
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"int tst(void)\n"
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"{\n"
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" int i;\n"
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" for (i = 2; i < 20; i++)\n"
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" printf(\"%d \", fib(i));\n"
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" printf(\"\\n\");\n"
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" return 0;\n"
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"}\n";
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void handle_error(void *opaque, const char *msg)
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{
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fprintf(opaque, "%s\n", msg);
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}
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int
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main(void)
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{
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int (*func)(void);
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TCCState *s = tcc_new();
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if (!s) {
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fprintf(stderr, __FILE__ ": could not create tcc state\n");
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return 1;
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}
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#if 1
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/* If -g option is not set the debugging files tst.c en tst.o will
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not be created. */
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tcc_set_options(s, "-g");
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#endif
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tcc_set_error_func(s, stdout, handle_error);
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tcc_set_output_type(s, TCC_OUTPUT_MEMORY);
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if (tcc_compile_string_file(s, program, "tst.c") == -1)
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return 1;
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if (tcc_relocate(s) < 0)
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return 1;
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elf_output_obj(s, "tst.o");
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/* set breakpoint on next line. and load symbol file with
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gdb command add-symbol-file.
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Then set breakpoint on tst and continue. */
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if ((func = tcc_get_symbol(s, "tst")))
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func();
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tcc_delete(s);
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return 0;
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}
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