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Fill in CompiledFunction::body with the instructions.

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Use a bit of a hack to find the function, we ask LLVM to emit it to a non-standard section with a name of our choosing, and that entire section should have our function body and nothing else.
This commit is contained in:
Nick Lewycky
2020-04-24 16:06:03 -07:00
parent 8b7da22a1a
commit 474b3eb2f2
1 changed files with 10 additions and 5 deletions
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15
lib/compiler-llvm/src/translator/code.rs
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@ -121,6 +121,7 @@ impl FuncTranslator {
// TODO: figure out how many bytes long vmctx is, and mark it dereferenceable. (no need to mark it nonnull once we do this.)
// TODO: mark vmctx nofree
func.set_personality_function(intrinsics.personality);
func.as_global_value().set_section("wasmer_function");
let entry = self.ctx.append_basic_block(func, "entry");
let start_of_code = self.ctx.append_basic_block(func, "start_of_code");
@ -267,13 +268,17 @@ impl FuncTranslator {
.write_to_memory_buffer(&mut module, FileType::Object)
.unwrap();
//let _mem_buf_slice = memory_buffer.as_slice();
memory_buffer.create_object_file().map_err(|()| {
let object = memory_buffer.create_object_file().map_err(|()| {
CompileError::Codegen("failed to create object file from llvm ir".to_string())
})?;
// TODO: grab text section, use it to fill in 'body'.
let mut bytes = vec![];
for section in object.get_sections() {
if section.get_name().to_bytes() == "wasmer_function".as_bytes() {
bytes.extend(section.get_contents().to_bytes());
break;
}
}
let address_map = FunctionAddressMap {
instructions: vec![],
@ -285,7 +290,7 @@ impl FuncTranslator {
Ok(CompiledFunction {
address_map,
body: vec![],
body: bytes,
jt_offsets: SecondaryMap::new(),
unwind_info: CompiledFunctionUnwindInfo::None,
relocations: vec![],