bjoernager/rust
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Categorize and explain target features support

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This commit is contained in:
Matt Ickstadt 2021-04-08 00:00:47 -05:00
parent 361bfce305
commit e258a5ba6e
3 changed files with 91 additions and 25 deletions
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33
compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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@ -404,26 +404,21 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM) {
printf("\n");
}
extern "C" void LLVMRustPrintTargetFeatures(LLVMTargetMachineRef TM) {
extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
unsigned MaxFeatLen = getLongestEntryLength(FeatTable);
return FeatTable.size();
}
printf("Available features for this target:\n");
for (auto &Feature : FeatTable)
printf(" %-*s - %s.\n", MaxFeatLen, Feature.Key, Feature.Desc);
printf("\nRust-specific features:\n");
printf(" %-*s - %s.\n",
MaxFeatLen,
"crt-static",
"Enables libraries with C Run-time Libraries(CRT) to be statically linked"
);
printf("\n");
printf("Use +feature to enable a feature, or -feature to disable it.\n"
"For example, rustc -C -target-cpu=mycpu -C "
"target-feature=+feature1,-feature2\n\n");
extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef TM, size_t Index,
const char** Feature, const char** Desc) {
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
const SubtargetFeatureKV Feat = FeatTable[Index];
*Feature = Feat.Key;
*Desc = Feat.Desc;
}
#else
@ -432,9 +427,11 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef) {
printf("Target CPU help is not supported by this LLVM version.\n\n");
}
extern "C" void LLVMRustPrintTargetFeatures(LLVMTargetMachineRef) {
printf("Target features help is not supported by this LLVM version.\n\n");
extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef) {
return 0;
}
extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef, const char**, const char**) {}
#endif
extern "C" const char* LLVMRustGetHostCPUName(size_t *len) {