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stage1: deal with WebAssembly not supporting @returnAddress()

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This makes `@returnAddress()` return 0 for WebAssembly (when not using
the Emscripten OS) and avoids trying to capture stack traces for the
general purpose allocator on that target.
This commit is contained in:
Andrew Kelley
2020-08-08 01:00:29 -07:00
parent 9f5a7d5922
commit 1b1921f0e2
3 changed files with 19 additions and 3 deletions
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6
src/codegen.cpp
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@@ -5886,6 +5886,12 @@ static LLVMValueRef ir_render_breakpoint(CodeGen *g, IrExecutableGen *executable
static LLVMValueRef ir_render_return_address(CodeGen *g, IrExecutableGen *executable,
IrInstGenReturnAddress *instruction)
{
if (target_is_wasm(g->zig_target) && g->zig_target->os != OsEmscripten) {
// I got this error from LLVM 10:
// "Non-Emscripten WebAssembly hasn't implemented __builtin_return_address"
return LLVMConstNull(get_llvm_type(g, instruction->base.value->type));
}
LLVMValueRef zero = LLVMConstNull(g->builtin_types.entry_i32->llvm_type);
LLVMValueRef ptr_val = LLVMBuildCall(g->builder, get_return_address_fn_val(g), &zero, 1, "");
return LLVMBuildPtrToInt(g->builder, ptr_val, g->builtin_types.entry_usize->llvm_type, "");