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Implement feature extraction from TargetMachine

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Add the `LLVMRustHasFeature` function to check whether a
`TargetMachine` has a given feature.
This commit is contained in:
Andrea Canciani 2016-02-16 17:07:30 +01:00
parent 64a35f9d23
commit c883463e94
4 changed files with 83 additions and 0 deletions
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69
src/rustllvm/PassWrapper.cpp
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@ -97,6 +97,75 @@ LLVMRustAddPass(LLVMPassManagerRef PM, Pass *pass) {
pm->add(pass);
}
#ifdef LLVM_COMPONENT_X86
#define SUBTARGET_X86 SUBTARGET(X86)
#else
#define SUBTARGET_X86
#endif
#ifdef LLVM_COMPONENT_ARM
#define SUBTARGET_ARM SUBTARGET(ARM)
#else
#define SUBTARGET_ARM
#endif
#ifdef LLVM_COMPONENT_AARCH64
#define SUBTARGET_AARCH64 SUBTARGET(AArch64)
#else
#define SUBTARGET_AARCH64
#endif
#ifdef LLVM_COMPONENT_MIPS
#define SUBTARGET_MIPS SUBTARGET(Mips)
#else
#define SUBTARGET_MIPS
#endif
#ifdef LLVM_COMPONENT_POWERPC
#define SUBTARGET_PPC SUBTARGET(PPC)
#else
#define SUBTARGET_PPC
#endif
#define GEN_SUBTARGETS \
SUBTARGET_X86 \
SUBTARGET_ARM \
SUBTARGET_AARCH64 \
SUBTARGET_MIPS \
SUBTARGET_PPC
#define SUBTARGET(x) namespace llvm { \
extern const SubtargetFeatureKV x##FeatureKV[]; \
extern const SubtargetFeatureKV x##SubTypeKV[]; \
}
GEN_SUBTARGETS
#undef SUBTARGET
extern "C" bool
LLVMRustHasFeature(LLVMTargetMachineRef TM,
const char *feature) {
TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const FeatureBitset &Bits = MCInfo->getFeatureBits();
const llvm::SubtargetFeatureKV *FeatureEntry;
#define SUBTARGET(x) \
if (MCInfo->isCPUStringValid(x##SubTypeKV[0].Key)) { \
FeatureEntry = x##FeatureKV; \
} else
GEN_SUBTARGETS {
return false;
}
#undef SUBTARGET
while (strcmp(feature, FeatureEntry->Key) != 0)
FeatureEntry++;
return (Bits & FeatureEntry->Value) == FeatureEntry->Value;
}
extern "C" LLVMTargetMachineRef
LLVMRustCreateTargetMachine(const char *triple,
const char *cpu,