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| -rw-r--r-- | doc/gimple.md | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/doc/gimple.md b/doc/gimple.md index e2ae93cf20d..145c4eda3c1 100644 --- a/doc/gimple.md +++ b/doc/gimple.md @@ -33,9 +33,17 @@ also add the calls we need to generate the GIMPLE: ```C int main() { gcc_jit_context *ctxt = gcc_jit_context_acquire(); + // To set `-O3`, update it depending on your needs. + gcc_jit_context_set_int_option(ctxt, GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, 3); + // Very important option to generate the gimple format. + gcc_jit_context_set_bool_option(ctxt, GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE, 1); create_code(ctxt, NULL); + gcc_jit_context_compile(ctxt); - gcc_jit_context_dump_to_file(ctxt, "tmp.gimple", 1); + // If you want to compile to assembly (or any other format) directly, you can + // use the following call instead: + // gcc_jit_context_compile_to_file(ctxt, GCC_JIT_OUTPUT_KIND_ASSEMBLER, "out.s"); + return 0; } ``` @@ -52,7 +60,7 @@ And finally when you run it: LD_LIBRARY_PATH=`pwd`/gcc-build/gcc LIBRARY_PATH=`pwd`/gcc-build/gcc ./out ``` -You should now have a file named `tmp.gimple` which contains: +It should display: ```c __attribute__((const)) @@ -79,3 +87,25 @@ int xxx () return D.3394; } ``` + +An alternative way to generate the GIMPLE is to replace: + +```c + gcc_jit_context_set_bool_option(ctxt, GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE, 1); +``` + +with: + +```c + gcc_jit_context_add_command_line_option(ctxt, "-fdump-tree-gimple"); +``` + +(although you can have both at the same time too). Then you can compile it like previously. Only one difference: before executing it, I recommend to run: + +```console +rm -rf /tmp/libgccjit-* +``` + +to make it easier for you to know which folder to look into. + +Once the execution is done, you should now have a file with path looking like `/tmp/libgccjit-9OFqkD/fake.c.006t.gimple` which contains the GIMPLE format. |