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c559ba7251
of the abi we should be using. For targets that don't use the option there's no change, otherwise this allows external users to set the ABI via string and avoid some of the -backend-option pain in clang. Use this option to move the ABI for the ARM port from the Subtarget to the TargetMachine and update the testcases accordingly since it's no longer valid to set via -mattr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224492 91177308-0d34-0410-b5e6-96231b3b80d8
316 lines
13 KiB
C++
316 lines
13 KiB
C++
//===-- llvm/Target/TargetOptions.h - Target Options ------------*- C++ -*-===//
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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 defines command line option flags that are shared across various
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// targets.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETOPTIONS_H
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#define LLVM_TARGET_TARGETOPTIONS_H
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#include "llvm/MC/MCTargetOptions.h"
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#include <string>
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namespace llvm {
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class MachineFunction;
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class StringRef;
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// Possible float ABI settings. Used with FloatABIType in TargetOptions.h.
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namespace FloatABI {
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enum ABIType {
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Default, // Target-specific (either soft or hard depending on triple,etc).
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Soft, // Soft float.
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Hard // Hard float.
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};
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}
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namespace FPOpFusion {
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enum FPOpFusionMode {
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Fast, // Enable fusion of FP ops wherever it's profitable.
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Standard, // Only allow fusion of 'blessed' ops (currently just fmuladd).
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Strict // Never fuse FP-ops.
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};
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}
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namespace JumpTable {
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enum JumpTableType {
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Single, // Use a single table for all indirect jumptable calls.
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Arity, // Use one table per number of function parameters.
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Simplified, // Use one table per function type, with types projected
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// into 4 types: pointer to non-function, struct,
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// primitive, and function pointer.
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Full // Use one table per unique function type
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};
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}
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namespace ThreadModel {
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enum Model {
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POSIX, // POSIX Threads
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Single // Single Threaded Environment
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};
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}
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enum class CFIntegrity {
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Sub, // Use subtraction-based checks.
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Ror, // Use rotation-based checks.
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Add // Use addition-based checks. This depends on having
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// sufficient alignment in the code and is usually not
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// feasible.
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};
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class TargetOptions {
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public:
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TargetOptions()
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: PrintMachineCode(false), NoFramePointerElim(false),
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LessPreciseFPMADOption(false), UnsafeFPMath(false),
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NoInfsFPMath(false), NoNaNsFPMath(false),
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HonorSignDependentRoundingFPMathOption(false), UseSoftFloat(false),
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NoZerosInBSS(false), JITEmitDebugInfo(false),
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JITEmitDebugInfoToDisk(false), GuaranteedTailCallOpt(false),
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DisableTailCalls(false), StackAlignmentOverride(0),
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EnableFastISel(false), PositionIndependentExecutable(false),
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UseInitArray(false), DisableIntegratedAS(false),
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CompressDebugSections(false), FunctionSections(false),
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DataSections(false), TrapUnreachable(false), TrapFuncName(),
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ABIName(), FloatABIType(FloatABI::Default),
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AllowFPOpFusion(FPOpFusion::Standard), JTType(JumpTable::Single),
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FCFI(false), ThreadModel(ThreadModel::POSIX),
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CFIType(CFIntegrity::Sub), CFIEnforcing(false), CFIFuncName() {}
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/// PrintMachineCode - This flag is enabled when the -print-machineinstrs
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/// option is specified on the command line, and should enable debugging
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/// output from the code generator.
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unsigned PrintMachineCode : 1;
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/// NoFramePointerElim - This flag is enabled when the -disable-fp-elim is
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/// specified on the command line. If the target supports the frame pointer
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/// elimination optimization, this option should disable it.
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unsigned NoFramePointerElim : 1;
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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) const;
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/// LessPreciseFPMAD - This flag is enabled when the
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/// -enable-fp-mad is specified on the command line. When this flag is off
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/// (the default), the code generator is not allowed to generate mad
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/// (multiply add) if the result is "less precise" than doing those
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/// operations individually.
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unsigned LessPreciseFPMADOption : 1;
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bool LessPreciseFPMAD() const;
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/// UnsafeFPMath - This flag is enabled when the
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/// -enable-unsafe-fp-math flag is specified on the command line. When
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/// this flag is off (the default), the code generator is not allowed to
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/// produce results that are "less precise" than IEEE allows. This includes
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/// use of X86 instructions like FSIN and FCOS instead of libcalls.
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/// UnsafeFPMath implies LessPreciseFPMAD.
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unsigned UnsafeFPMath : 1;
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/// NoInfsFPMath - This flag is enabled when the
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/// -enable-no-infs-fp-math flag is specified on the command line. When
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/// this flag is off (the default), the code generator is not allowed to
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/// assume the FP arithmetic arguments and results are never +-Infs.
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unsigned NoInfsFPMath : 1;
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/// NoNaNsFPMath - This flag is enabled when the
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/// -enable-no-nans-fp-math flag is specified on the command line. When
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/// this flag is off (the default), the code generator is not allowed to
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/// assume the FP arithmetic arguments and results are never NaNs.
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unsigned NoNaNsFPMath : 1;
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/// HonorSignDependentRoundingFPMath - This returns true when the
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/// -enable-sign-dependent-rounding-fp-math is specified. If this returns
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/// false (the default), the code generator is allowed to assume that the
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/// rounding behavior is the default (round-to-zero for all floating point
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/// to integer conversions, and round-to-nearest for all other arithmetic
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/// truncations). If this is enabled (set to true), the code generator must
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/// assume that the rounding mode may dynamically change.
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unsigned HonorSignDependentRoundingFPMathOption : 1;
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bool HonorSignDependentRoundingFPMath() const;
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/// UseSoftFloat - This flag is enabled when the -soft-float flag is
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/// specified on the command line. When this flag is on, the code generator
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/// will generate libcalls to the software floating point library instead of
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/// target FP instructions.
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unsigned UseSoftFloat : 1;
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/// NoZerosInBSS - By default some codegens place zero-initialized data to
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/// .bss section. This flag disables such behaviour (necessary, e.g. for
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/// crt*.o compiling).
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unsigned NoZerosInBSS : 1;
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/// JITEmitDebugInfo - This flag indicates that the JIT should try to emit
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/// debug information and notify a debugger about it.
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unsigned JITEmitDebugInfo : 1;
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/// JITEmitDebugInfoToDisk - This flag indicates that the JIT should write
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/// the object files generated by the JITEmitDebugInfo flag to disk. This
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/// flag is hidden and is only for debugging the debug info.
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unsigned JITEmitDebugInfoToDisk : 1;
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/// GuaranteedTailCallOpt - This flag is enabled when -tailcallopt is
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/// specified on the commandline. When the flag is on, participating targets
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/// will perform tail call optimization on all calls which use the fastcc
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/// calling convention and which satisfy certain target-independent
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/// criteria (being at the end of a function, having the same return type
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/// as their parent function, etc.), using an alternate ABI if necessary.
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unsigned GuaranteedTailCallOpt : 1;
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/// DisableTailCalls - This flag controls whether we will use tail calls.
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/// Disabling them may be useful to maintain a correct call stack.
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unsigned DisableTailCalls : 1;
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/// StackAlignmentOverride - Override default stack alignment for target.
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unsigned StackAlignmentOverride;
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/// EnableFastISel - This flag enables fast-path instruction selection
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/// which trades away generated code quality in favor of reducing
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/// compile time.
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unsigned EnableFastISel : 1;
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/// PositionIndependentExecutable - This flag indicates whether the code
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/// will eventually be linked into a single executable, despite the PIC
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/// relocation model being in use. It's value is undefined (and irrelevant)
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/// if the relocation model is anything other than PIC.
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unsigned PositionIndependentExecutable : 1;
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/// UseInitArray - Use .init_array instead of .ctors for static
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/// constructors.
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unsigned UseInitArray : 1;
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/// Disable the integrated assembler.
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unsigned DisableIntegratedAS : 1;
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/// Compress DWARF debug sections.
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unsigned CompressDebugSections : 1;
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/// Emit functions into separate sections.
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unsigned FunctionSections : 1;
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/// Emit data into separate sections.
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unsigned DataSections : 1;
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/// Emit target-specific trap instruction for 'unreachable' IR instructions.
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unsigned TrapUnreachable : 1;
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/// getTrapFunctionName - If this returns a non-empty string, this means
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/// isel should lower Intrinsic::trap to a call to the specified function
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/// name instead of an ISD::TRAP node.
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std::string TrapFuncName;
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StringRef getTrapFunctionName() const;
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/// getABIName - If this returns a non-empty string this represents the
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/// textual name of the ABI that we want the backend to use, e.g. o32, or
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/// aapcs-linux.
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std::string ABIName;
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StringRef getABIName() const;
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/// FloatABIType - This setting is set by -float-abi=xxx option is specfied
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/// on the command line. This setting may either be Default, Soft, or Hard.
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/// Default selects the target's default behavior. Soft selects the ABI for
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/// UseSoftFloat, but does not indicate that FP hardware may not be used.
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/// Such a combination is unfortunately popular (e.g. arm-apple-darwin).
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/// Hard presumes that the normal FP ABI is used.
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FloatABI::ABIType FloatABIType;
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/// AllowFPOpFusion - This flag is set by the -fuse-fp-ops=xxx option.
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/// This controls the creation of fused FP ops that store intermediate
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/// results in higher precision than IEEE allows (E.g. FMAs).
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///
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/// Fast mode - allows formation of fused FP ops whenever they're
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/// profitable.
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/// Standard mode - allow fusion only for 'blessed' FP ops. At present the
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/// only blessed op is the fmuladd intrinsic. In the future more blessed ops
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/// may be added.
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/// Strict mode - allow fusion only if/when it can be proven that the excess
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/// precision won't effect the result.
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///
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/// Note: This option only controls formation of fused ops by the
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/// optimizers. Fused operations that are explicitly specified (e.g. FMA
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/// via the llvm.fma.* intrinsic) will always be honored, regardless of
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/// the value of this option.
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FPOpFusion::FPOpFusionMode AllowFPOpFusion;
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/// JTType - This flag specifies the type of jump-instruction table to
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/// create for functions that have the jumptable attribute.
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JumpTable::JumpTableType JTType;
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/// FCFI - This flags controls whether or not forward-edge control-flow
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/// integrity is applied.
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bool FCFI;
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/// ThreadModel - This flag specifies the type of threading model to assume
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/// for things like atomics
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ThreadModel::Model ThreadModel;
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/// CFIType - This flag specifies the type of control-flow integrity check
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/// to add as a preamble to indirect calls.
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CFIntegrity CFIType;
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/// CFIEnforcing - This flags controls whether or not CFI violations cause
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/// the program to halt.
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bool CFIEnforcing;
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/// getCFIFuncName - If this returns a non-empty string, then this is the
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/// name of the function that will be called for each CFI violation in
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/// non-enforcing mode.
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std::string CFIFuncName;
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StringRef getCFIFuncName() const;
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/// Machine level options.
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MCTargetOptions MCOptions;
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};
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// Comparison operators:
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inline bool operator==(const TargetOptions &LHS,
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const TargetOptions &RHS) {
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#define ARE_EQUAL(X) LHS.X == RHS.X
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return
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ARE_EQUAL(UnsafeFPMath) &&
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ARE_EQUAL(NoInfsFPMath) &&
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ARE_EQUAL(NoNaNsFPMath) &&
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ARE_EQUAL(HonorSignDependentRoundingFPMathOption) &&
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ARE_EQUAL(UseSoftFloat) &&
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ARE_EQUAL(NoZerosInBSS) &&
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ARE_EQUAL(JITEmitDebugInfo) &&
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ARE_EQUAL(JITEmitDebugInfoToDisk) &&
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ARE_EQUAL(GuaranteedTailCallOpt) &&
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ARE_EQUAL(DisableTailCalls) &&
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ARE_EQUAL(StackAlignmentOverride) &&
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ARE_EQUAL(EnableFastISel) &&
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ARE_EQUAL(PositionIndependentExecutable) &&
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ARE_EQUAL(UseInitArray) &&
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ARE_EQUAL(TrapUnreachable) &&
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ARE_EQUAL(TrapFuncName) &&
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ARE_EQUAL(ABIName) &&
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ARE_EQUAL(FloatABIType) &&
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ARE_EQUAL(AllowFPOpFusion) &&
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ARE_EQUAL(JTType) &&
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ARE_EQUAL(FCFI) &&
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ARE_EQUAL(ThreadModel) &&
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ARE_EQUAL(CFIType) &&
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ARE_EQUAL(CFIEnforcing) &&
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ARE_EQUAL(CFIFuncName) &&
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ARE_EQUAL(MCOptions);
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#undef ARE_EQUAL
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}
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inline bool operator!=(const TargetOptions &LHS,
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const TargetOptions &RHS) {
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return !(LHS == RHS);
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}
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} // End llvm namespace
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#endif
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