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Add simpler alternative to generate gimple

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Guillaume Gomez 2023-09-07 14:21:58 +02:00 committed by GitHub
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1 changed files with 24 additions and 10 deletions
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doc/gimple.md
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@ -36,7 +36,7 @@ int main() {
// To set `-O3`, update it depending on your needs. // To set `-O3`, update it depending on your needs.
gcc_jit_context_set_int_option(ctxt, GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, 3); gcc_jit_context_set_int_option(ctxt, GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, 3);
// Very important option to generate the gimple format. // Very important option to generate the gimple format.
gcc_jit_context_add_command_line_option(ctxt, "-fdump-tree-gimple"); gcc_jit_context_set_bool_option(ctxt, GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE, 1);
create_code(ctxt, NULL); create_code(ctxt, NULL);
gcc_jit_context_compile(ctxt); gcc_jit_context_compile(ctxt);
@ -54,21 +54,13 @@ Then we can compile it by using:
gcc local.c -I `pwd`/gcc/gcc/jit/ -L `pwd`/gcc-build/gcc -lgccjit -o out gcc local.c -I `pwd`/gcc/gcc/jit/ -L `pwd`/gcc-build/gcc -lgccjit -o out
``` ```
Before running it, I recommend running:
```console
rm -rf /tmp/libgccjit-*
```
to make it easier for you to know which folder to look into.
And finally when you run it: And finally when you run it:
```console ```console
LD_LIBRARY_PATH=`pwd`/gcc-build/gcc LIBRARY_PATH=`pwd`/gcc-build/gcc ./out LD_LIBRARY_PATH=`pwd`/gcc-build/gcc LIBRARY_PATH=`pwd`/gcc-build/gcc ./out
``` ```
You should now have a file named with path looking like `/tmp/libgccjit-9OFqkD/fake.c.006t.gimple` which contains: It should display:
```c ```c
__attribute__((const)) __attribute__((const))
@ -95,3 +87,25 @@ int xxx ()
return D.3394; 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.