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while loops

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Note that neither the payload capture variable nor the error capture
variable require a stack allocation.

```zig
export fn entry() void {
    var c: anyerror!i32 = 1234;
    while (c) |hi| {} else |e| {}
}
```

```llvm
define void @entry() #2 !dbg !39 {
Entry:
  %c = alloca { i16, i32 }, align 4
  %0 = bitcast { i16, i32 }* %c to i8*, !dbg !52
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %0, i8* align 4 bitcast ({ i16, i32 }* @0 to i8*), i64 8, i1 false), !dbg !52
  call void @llvm.dbg.declare(metadata { i16, i32 }* %c, metadata !43, metadata !DIExpression()), !dbg !52
  br label %WhileCond, !dbg !53

WhileCond:                                        ; preds = %WhileBody, %Entry
  %1 = getelementptr inbounds { i16, i32 }, { i16, i32 }* %c, i32 0, i32 0, !dbg !54
  %2 = load i16, i16* %1, align 2, !dbg !54
  %3 = icmp ne i16 %2, 0, !dbg !54
  br i1 %3, label %WhileElse, label %WhileBody, !dbg !54

WhileBody:                                        ; preds = %WhileCond
  %4 = getelementptr inbounds { i16, i32 }, { i16, i32 }* %c, i32 0, i32 1, !dbg !53
  call void @llvm.dbg.declare(metadata i32* %4, metadata !50, metadata !DIExpression()), !dbg !53
  br label %WhileCond, !dbg !53

WhileElse:                                        ; preds = %WhileCond
  %5 = getelementptr inbounds { i16, i32 }, { i16, i32 }* %c, i32 0, i32 0, !dbg !55
  call void @llvm.dbg.declare(metadata i16* %5, metadata !51, metadata !DIExpression()), !dbg !55
  ret void, !dbg !56
}
```
This commit is contained in:
Andrew Kelley
2019-06-03 20:56:22 -04:00
parent b6108eed52
commit d4054e35fe
5 changed files with 86 additions and 82 deletions
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14
src/codegen.cpp
View File

@@ -4878,18 +4878,16 @@ static LLVMValueRef ir_render_test_err(CodeGen *g, IrExecutable *executable, IrI
static LLVMValueRef ir_render_unwrap_err_code(CodeGen *g, IrExecutable *executable,
IrInstructionUnwrapErrCode *instruction)
{
ZigType *ptr_type = instruction->err_union->value.type;
ZigType *ptr_type = instruction->err_union_ptr->value.type;
assert(ptr_type->id == ZigTypeIdPointer);
ZigType *err_union_type = ptr_type->data.pointer.child_type;
ZigType *payload_type = err_union_type->data.error_union.payload_type;
LLVMValueRef err_union_ptr = ir_llvm_value(g, instruction->err_union);
LLVMValueRef err_union_handle = get_handle_value(g, err_union_ptr, err_union_type, ptr_type);
if (type_has_bits(payload_type)) {
LLVMValueRef err_val_ptr = LLVMBuildStructGEP(g->builder, err_union_handle, err_union_err_index, "");
return gen_load_untyped(g, err_val_ptr, 0, false, "");
LLVMValueRef err_union_ptr = ir_llvm_value(g, instruction->err_union_ptr);
if (!type_has_bits(payload_type)) {
return err_union_ptr;
} else {
return err_union_handle;
LLVMValueRef err_union_handle = get_handle_value(g, err_union_ptr, err_union_type, ptr_type);
return LLVMBuildStructGEP(g->builder, err_union_handle, err_union_err_index, "");
}
}