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/ADT/StringSwitch.h"
14#include "llvm/CodeGen/MachineFrameInfo.h"
15#include "llvm/CodeGen/MachineFunction.h"
16#include "llvm/CodeGen/TargetFrameLowering.h"
17#include "llvm/CodeGen/TargetSubtargetInfo.h"
18#include "llvm/IR/Function.h"
19#include "llvm/Target/TargetOptions.h"
20using namespace llvm;
21
22/// DisableFramePointerElim - This returns true if frame pointer elimination
23/// optimization should be disabled for the given machine function.
24bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
25 // Check to see if the target want to forcibly keep frame pointer.
26 if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
27 return true;
28
29 const Function &F = MF.getFunction();
30
31 if (!F.hasFnAttribute(Kind: "frame-pointer"))
32 return false;
33 StringRef FP = F.getFnAttribute(Kind: "frame-pointer").getValueAsString();
34 if (FP == "all")
35 return true;
36 if (FP == "non-leaf")
37 return MF.getFrameInfo().hasCalls();
38 if (FP == "none" || FP == "reserved")
39 return false;
40 llvm_unreachable("unknown frame pointer flag");
41}
42
43bool TargetOptions::FramePointerIsReserved(const MachineFunction &MF) const {
44 // Check to see if the target want to forcibly keep frame pointer.
45 if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
46 return true;
47
48 const Function &F = MF.getFunction();
49
50 if (!F.hasFnAttribute(Kind: "frame-pointer"))
51 return false;
52
53 StringRef FP = F.getFnAttribute(Kind: "frame-pointer").getValueAsString();
54 return StringSwitch<bool>(FP)
55 .Cases(S0: "all", S1: "non-leaf", S2: "reserved", Value: true)
56 .Case(S: "none", Value: false);
57}
58
59/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
60/// that the rounding mode of the FPU can change from its default.
61bool TargetOptions::HonorSignDependentRoundingFPMath() const {
62 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
63}
64
65/// NOTE: There are targets that still do not support the debug entry values
66/// production and that is being controlled with the SupportsDebugEntryValues.
67/// In addition, SCE debugger does not have the feature implemented, so prefer
68/// not to emit the debug entry values in that case.
69/// The EnableDebugEntryValues can be used for the testing purposes.
70bool TargetOptions::ShouldEmitDebugEntryValues() const {
71 return (SupportsDebugEntryValues && DebuggerTuning != DebuggerKind::SCE) ||
72 EnableDebugEntryValues;
73}
74