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