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Add help for target CPUs, features, relocation and code models.

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This commit is contained in:
Cameron Hart 2016-07-11 00:22:13 +10:00
parent d11936251a
commit e1efa324ec
6 changed files with 95 additions and 4 deletions
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38
src/rustllvm/PassWrapper.cpp
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@ -162,6 +162,44 @@ LLVMRustHasFeature(LLVMTargetMachineRef TM,
return (Bits & FeatureEntry->Value) == FeatureEntry->Value;
}
/// getLongestEntryLength - Return the length of the longest entry in the table.
///
static size_t getLongestEntryLength(ArrayRef<SubtargetFeatureKV> Table) {
size_t MaxLen = 0;
for (auto &I : Table)
MaxLen = std::max(MaxLen, std::strlen(I.Key));
return MaxLen;
}
extern "C" void
LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM) {
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const ArrayRef<SubtargetFeatureKV> CPUTable = MCInfo->getCPUTable();
unsigned MaxCPULen = getLongestEntryLength(CPUTable);
printf("Available CPUs for this target:\n\n");
for (auto &CPU : CPUTable)
printf(" %-*s - %s.\n", MaxCPULen, CPU.Key, CPU.Desc);
printf("\n");
}
extern "C" void
LLVMRustPrintTargetFeatures(LLVMTargetMachineRef TM) {
const TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
unsigned MaxFeatLen = getLongestEntryLength(FeatTable);
printf("Available features for this target:\n\n");
for (auto &Feature : FeatTable)
printf(" %-*s - %s.\n", MaxFeatLen, Feature.Key, Feature.Desc);
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");
}
extern "C" LLVMTargetMachineRef
LLVMRustCreateTargetMachine(const char *triple,
const char *cpu,