forked from OSchip/llvm-project
308 lines
10 KiB
C++
308 lines
10 KiB
C++
//===-- TargetMachine.cpp - General Target Information ---------------------==//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file describes the general parts of a Target machine.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineFrameInfo.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetOptions.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
using namespace llvm;
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Command-line options that tend to be useful on more than one back-end.
|
|
//
|
|
|
|
namespace llvm {
|
|
bool LessPreciseFPMADOption;
|
|
bool PrintMachineCode;
|
|
bool NoFramePointerElim;
|
|
bool NoFramePointerElimNonLeaf;
|
|
bool NoExcessFPPrecision;
|
|
bool UnsafeFPMath;
|
|
bool NoInfsFPMath;
|
|
bool NoNaNsFPMath;
|
|
bool HonorSignDependentRoundingFPMathOption;
|
|
bool UseSoftFloat;
|
|
FloatABI::ABIType FloatABIType;
|
|
bool NoImplicitFloat;
|
|
bool NoZerosInBSS;
|
|
bool JITExceptionHandling;
|
|
bool JITEmitDebugInfo;
|
|
bool JITEmitDebugInfoToDisk;
|
|
bool UnwindTablesMandatory;
|
|
Reloc::Model RelocationModel;
|
|
CodeModel::Model CMModel;
|
|
bool GuaranteedTailCallOpt;
|
|
unsigned StackAlignment;
|
|
bool RealignStack;
|
|
bool DisableJumpTables;
|
|
bool StrongPHIElim;
|
|
bool AsmVerbosityDefault(false);
|
|
}
|
|
|
|
static cl::opt<bool, true>
|
|
PrintCode("print-machineinstrs",
|
|
cl::desc("Print generated machine code"),
|
|
cl::location(PrintMachineCode), cl::init(false));
|
|
static cl::opt<bool, true>
|
|
DisableFPElim("disable-fp-elim",
|
|
cl::desc("Disable frame pointer elimination optimization"),
|
|
cl::location(NoFramePointerElim),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
DisableFPElimNonLeaf("disable-non-leaf-fp-elim",
|
|
cl::desc("Disable frame pointer elimination optimization for non-leaf funcs"),
|
|
cl::location(NoFramePointerElimNonLeaf),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
DisableExcessPrecision("disable-excess-fp-precision",
|
|
cl::desc("Disable optimizations that may increase FP precision"),
|
|
cl::location(NoExcessFPPrecision),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
EnableFPMAD("enable-fp-mad",
|
|
cl::desc("Enable less precise MAD instructions to be generated"),
|
|
cl::location(LessPreciseFPMADOption),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
EnableUnsafeFPMath("enable-unsafe-fp-math",
|
|
cl::desc("Enable optimizations that may decrease FP precision"),
|
|
cl::location(UnsafeFPMath),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
EnableNoInfsFPMath("enable-no-infs-fp-math",
|
|
cl::desc("Enable FP math optimizations that assume no +-Infs"),
|
|
cl::location(NoInfsFPMath),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
EnableNoNaNsFPMath("enable-no-nans-fp-math",
|
|
cl::desc("Enable FP math optimizations that assume no NaNs"),
|
|
cl::location(NoNaNsFPMath),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
|
|
cl::Hidden,
|
|
cl::desc("Force codegen to assume rounding mode can change dynamically"),
|
|
cl::location(HonorSignDependentRoundingFPMathOption),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
GenerateSoftFloatCalls("soft-float",
|
|
cl::desc("Generate software floating point library calls"),
|
|
cl::location(UseSoftFloat),
|
|
cl::init(false));
|
|
static cl::opt<llvm::FloatABI::ABIType, true>
|
|
FloatABIForCalls("float-abi",
|
|
cl::desc("Choose float ABI type"),
|
|
cl::location(FloatABIType),
|
|
cl::init(FloatABI::Default),
|
|
cl::values(
|
|
clEnumValN(FloatABI::Default, "default",
|
|
"Target default float ABI type"),
|
|
clEnumValN(FloatABI::Soft, "soft",
|
|
"Soft float ABI (implied by -soft-float)"),
|
|
clEnumValN(FloatABI::Hard, "hard",
|
|
"Hard float ABI (uses FP registers)"),
|
|
clEnumValEnd));
|
|
static cl::opt<bool, true>
|
|
DontPlaceZerosInBSS("nozero-initialized-in-bss",
|
|
cl::desc("Don't place zero-initialized symbols into bss section"),
|
|
cl::location(NoZerosInBSS),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
EnableJITExceptionHandling("jit-enable-eh",
|
|
cl::desc("Emit exception handling information"),
|
|
cl::location(JITExceptionHandling),
|
|
cl::init(false));
|
|
// In debug builds, make this default to true.
|
|
#ifdef NDEBUG
|
|
#define EMIT_DEBUG false
|
|
#else
|
|
#define EMIT_DEBUG true
|
|
#endif
|
|
static cl::opt<bool, true>
|
|
EmitJitDebugInfo("jit-emit-debug",
|
|
cl::desc("Emit debug information to debugger"),
|
|
cl::location(JITEmitDebugInfo),
|
|
cl::init(EMIT_DEBUG));
|
|
#undef EMIT_DEBUG
|
|
static cl::opt<bool, true>
|
|
EmitJitDebugInfoToDisk("jit-emit-debug-to-disk",
|
|
cl::Hidden,
|
|
cl::desc("Emit debug info objfiles to disk"),
|
|
cl::location(JITEmitDebugInfoToDisk),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
EnableUnwindTables("unwind-tables",
|
|
cl::desc("Generate unwinding tables for all functions"),
|
|
cl::location(UnwindTablesMandatory),
|
|
cl::init(false));
|
|
|
|
static cl::opt<llvm::Reloc::Model, true>
|
|
DefRelocationModel("relocation-model",
|
|
cl::desc("Choose relocation model"),
|
|
cl::location(RelocationModel),
|
|
cl::init(Reloc::Default),
|
|
cl::values(
|
|
clEnumValN(Reloc::Default, "default",
|
|
"Target default relocation model"),
|
|
clEnumValN(Reloc::Static, "static",
|
|
"Non-relocatable code"),
|
|
clEnumValN(Reloc::PIC_, "pic",
|
|
"Fully relocatable, position independent code"),
|
|
clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
|
|
"Relocatable external references, non-relocatable code"),
|
|
clEnumValEnd));
|
|
static cl::opt<llvm::CodeModel::Model, true>
|
|
DefCodeModel("code-model",
|
|
cl::desc("Choose code model"),
|
|
cl::location(CMModel),
|
|
cl::init(CodeModel::Default),
|
|
cl::values(
|
|
clEnumValN(CodeModel::Default, "default",
|
|
"Target default code model"),
|
|
clEnumValN(CodeModel::Small, "small",
|
|
"Small code model"),
|
|
clEnumValN(CodeModel::Kernel, "kernel",
|
|
"Kernel code model"),
|
|
clEnumValN(CodeModel::Medium, "medium",
|
|
"Medium code model"),
|
|
clEnumValN(CodeModel::Large, "large",
|
|
"Large code model"),
|
|
clEnumValEnd));
|
|
static cl::opt<bool, true>
|
|
EnableGuaranteedTailCallOpt("tailcallopt",
|
|
cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
|
|
cl::location(GuaranteedTailCallOpt),
|
|
cl::init(false));
|
|
static cl::opt<unsigned, true>
|
|
OverrideStackAlignment("stack-alignment",
|
|
cl::desc("Override default stack alignment"),
|
|
cl::location(StackAlignment),
|
|
cl::init(0));
|
|
static cl::opt<bool, true>
|
|
EnableRealignStack("realign-stack",
|
|
cl::desc("Realign stack if needed"),
|
|
cl::location(RealignStack),
|
|
cl::init(true));
|
|
static cl::opt<bool, true>
|
|
DisableSwitchTables(cl::Hidden, "disable-jump-tables",
|
|
cl::desc("Do not generate jump tables."),
|
|
cl::location(DisableJumpTables),
|
|
cl::init(false));
|
|
static cl::opt<bool, true>
|
|
EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
|
|
cl::desc("Use strong PHI elimination."),
|
|
cl::location(StrongPHIElim),
|
|
cl::init(false));
|
|
static cl::opt<bool>
|
|
DataSections("fdata-sections",
|
|
cl::desc("Emit data into separate sections"),
|
|
cl::init(false));
|
|
static cl::opt<bool>
|
|
FunctionSections("ffunction-sections",
|
|
cl::desc("Emit functions into separate sections"),
|
|
cl::init(false));
|
|
//---------------------------------------------------------------------------
|
|
// TargetMachine Class
|
|
//
|
|
|
|
TargetMachine::TargetMachine(const Target &T)
|
|
: TheTarget(T), AsmInfo(0),
|
|
MCRelaxAll(false),
|
|
MCNoExecStack(false),
|
|
MCSaveTempLabels(false),
|
|
MCUseLoc(true) {
|
|
// Typically it will be subtargets that will adjust FloatABIType from Default
|
|
// to Soft or Hard.
|
|
if (UseSoftFloat)
|
|
FloatABIType = FloatABI::Soft;
|
|
}
|
|
|
|
TargetMachine::~TargetMachine() {
|
|
delete AsmInfo;
|
|
}
|
|
|
|
/// getRelocationModel - Returns the code generation relocation model. The
|
|
/// choices are static, PIC, and dynamic-no-pic, and target default.
|
|
Reloc::Model TargetMachine::getRelocationModel() {
|
|
return RelocationModel;
|
|
}
|
|
|
|
/// setRelocationModel - Sets the code generation relocation model.
|
|
void TargetMachine::setRelocationModel(Reloc::Model Model) {
|
|
RelocationModel = Model;
|
|
}
|
|
|
|
/// getCodeModel - Returns the code model. The choices are small, kernel,
|
|
/// medium, large, and target default.
|
|
CodeModel::Model TargetMachine::getCodeModel() {
|
|
return CMModel;
|
|
}
|
|
|
|
/// setCodeModel - Sets the code model.
|
|
void TargetMachine::setCodeModel(CodeModel::Model Model) {
|
|
CMModel = Model;
|
|
}
|
|
|
|
bool TargetMachine::getAsmVerbosityDefault() {
|
|
return AsmVerbosityDefault;
|
|
}
|
|
|
|
void TargetMachine::setAsmVerbosityDefault(bool V) {
|
|
AsmVerbosityDefault = V;
|
|
}
|
|
|
|
bool TargetMachine::getFunctionSections() {
|
|
return FunctionSections;
|
|
}
|
|
|
|
bool TargetMachine::getDataSections() {
|
|
return DataSections;
|
|
}
|
|
|
|
void TargetMachine::setFunctionSections(bool V) {
|
|
FunctionSections = V;
|
|
}
|
|
|
|
void TargetMachine::setDataSections(bool V) {
|
|
DataSections = V;
|
|
}
|
|
|
|
namespace llvm {
|
|
/// DisableFramePointerElim - This returns true if frame pointer elimination
|
|
/// optimization should be disabled for the given machine function.
|
|
bool DisableFramePointerElim(const MachineFunction &MF) {
|
|
// Check to see if we should eliminate non-leaf frame pointers and then
|
|
// check to see if we should eliminate all frame pointers.
|
|
if (NoFramePointerElimNonLeaf && !NoFramePointerElim) {
|
|
const MachineFrameInfo *MFI = MF.getFrameInfo();
|
|
return MFI->hasCalls();
|
|
}
|
|
|
|
return NoFramePointerElim;
|
|
}
|
|
|
|
/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
|
|
/// is specified on the command line. When this flag is off(default), the
|
|
/// code generator is not allowed to generate mad (multiply add) if the
|
|
/// result is "less precise" than doing those operations individually.
|
|
bool LessPreciseFPMAD() { return UnsafeFPMath || LessPreciseFPMADOption; }
|
|
|
|
/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
|
|
/// that the rounding mode of the FPU can change from its default.
|
|
bool HonorSignDependentRoundingFPMath() {
|
|
return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
|
|
}
|
|
}
|