1//===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the methods in the TargetOptions.
10//
11//===----------------------------------------------------------------------===//
12
13#include "llvm/CodeGen/MachineFrameInfo.h"
14#include "llvm/CodeGen/MachineFunction.h"
15#include "llvm/CodeGen/TargetFrameLowering.h"
16#include "llvm/CodeGen/TargetSubtargetInfo.h"
17#include "llvm/IR/Function.h"
18#include "llvm/Target/TargetOptions.h"
19using namespace llvm;
20
21/// DisableFramePointerElim - This returns true if frame pointer elimination
22/// optimization should be disabled for the given machine function.
23bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
24  // Check to see if the target want to forcably keep frame pointer.
25  if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
26    return true;
27
28  const Function &F = MF.getFunction();
29
30  if (!F.hasFnAttribute("frame-pointer"))
31    return false;
32  StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString();
33  if (FP == "all")
34    return true;
35  if (FP == "non-leaf")
36    return MF.getFrameInfo().hasCalls();
37  if (FP == "none")
38    return false;
39  llvm_unreachable("unknown frame pointer flag");
40}
41
42/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
43/// that the rounding mode of the FPU can change from its default.
44bool TargetOptions::HonorSignDependentRoundingFPMath() const {
45  return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
46}
47
48/// NOTE: There are targets that still do not support the debug entry values
49/// production and that is being controlled with the SupportsDebugEntryValues.
50/// In addition, SCE debugger does not have the feature implemented, so prefer
51/// not to emit the debug entry values in that case.
52/// The EnableDebugEntryValues can be used for the testing purposes.
53bool TargetOptions::ShouldEmitDebugEntryValues() const {
54  return (SupportsDebugEntryValues && DebuggerTuning != DebuggerKind::SCE) ||
55         EnableDebugEntryValues;
56}
57