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returning from async fn adds bad resume safety

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Andrew Kelley 2019-07-21 17:17:44 -04:00
parent 6053ca4f69
commit 56c08eb302
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1 changed files with 8 additions and 0 deletions
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8
src/codegen.cpp
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@ -2102,6 +2102,14 @@ static LLVMValueRef ir_render_save_err_ret_addr(CodeGen *g, IrExecutable *execut
static LLVMValueRef ir_render_return(CodeGen *g, IrExecutable *executable, IrInstructionReturn *return_instruction) {
if (g->cur_fn->resume_blocks.length != 0) {
if (ir_want_runtime_safety(g, &return_instruction->base)) {
LLVMValueRef locals_ptr = g->cur_ret_ptr;
LLVMValueRef resume_index_ptr = LLVMBuildStructGEP(g->builder, locals_ptr, coro_resume_index_index, "");
LLVMValueRef new_resume_index = LLVMConstInt(g->builtin_types.entry_usize->llvm_type,
g->cur_fn->resume_blocks.length + 2, false);
LLVMBuildStore(g->builder, new_resume_index, resume_index_ptr);
}
LLVMBuildRet(g->builder, LLVMGetUndef(g->builtin_types.entry_usize->llvm_type));
return nullptr;
}