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Handling unimplemented externs.

This commit is contained in:
Ben Vanik 2014-01-28 22:11:33 -08:00
parent 8cddfcbf19
commit 62ced2742e
1 changed files with 15 additions and 3 deletions
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18
src/alloy/backend/x64/lowering/lowering_sequences.cc
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@ -90,6 +90,12 @@ void Dummy() {
//
}
void UnimplementedExtern(void* raw_context, ExternFunction* extern_fn) {
// TODO(benvanik): generate this thunk at runtime? or a shim?
auto thread_state = *((ThreadState**)raw_context);
extern_fn->Call(thread_state);
}
void Unpack_FLOAT16_2(void* raw_context, __m128& v) {
uint32_t src = v.m128_i32[3];
v.m128_f32[0] = DirectX::PackedVector::XMConvertHalfToFloat((uint16_t)src);
@ -142,9 +148,15 @@ void IssueCall(X64Emitter& e, FunctionInfo* symbol_info, uint32_t flags) {
auto fn = symbol_info->function();
if (fn && fn->type() == Function::EXTERN_FUNCTION) {
auto extern_fn = (ExternFunction*)fn;
e.mov(e.rdx, (uint64_t)extern_fn->arg0());
e.mov(e.r8, (uint64_t)extern_fn->arg1());
e.mov(e.rax, (uint64_t)extern_fn->handler());
if (extern_fn->handler()) {
e.mov(e.rdx, (uint64_t)extern_fn->arg0());
e.mov(e.r8, (uint64_t)extern_fn->arg1());
e.mov(e.rax, (uint64_t)extern_fn->handler());
} else {
// Unimplemented - call dummy.
e.mov(e.rdx, (uint64_t)extern_fn);
e.mov(e.rax, (uint64_t)UnimplementedExtern);
}
} else {
// Generic call, resolve address.
// TODO(benvanik): caching/etc. For now this makes debugging easier.