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//===-- SnippetFile.cpp -----------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "SnippetFile.h"
#include "Error.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SourceMgr.h"
#include <string>
namespace llvm {
namespace exegesis {
namespace {
// An MCStreamer that reads a BenchmarkCode definition from a file.
class BenchmarkCodeStreamer : public MCStreamer, public AsmCommentConsumer {
public:
explicit BenchmarkCodeStreamer(MCContext *Context,
const MCRegisterInfo *TheRegInfo,
BenchmarkCode *Result)
: MCStreamer(*Context), RegInfo(TheRegInfo), Result(Result) {}
// Implementation of the MCStreamer interface. We only care about
// instructions.
void emitInstruction(const MCInst &Instruction,
const MCSubtargetInfo &STI) override {
Result->Key.Instructions.push_back(Instruction);
}
// Implementation of the AsmCommentConsumer.
void HandleComment(SMLoc Loc, StringRef CommentText) override {
CommentText = CommentText.trim();
if (!CommentText.consume_front("LLVM-EXEGESIS-"))
return;
if (CommentText.consume_front("DEFREG")) {
// LLVM-EXEGESIS-DEFREF <reg> <hex_value>
RegisterValue RegVal;
SmallVector<StringRef, 2> Parts;
CommentText.split(Parts, ' ', /*unlimited splits*/ -1,
/*do not keep empty strings*/ false);
if (Parts.size() != 2) {
errs() << "invalid comment 'LLVM-EXEGESIS-DEFREG " << CommentText
<< "', expected two parameters <REG> <HEX_VALUE>\n";
++InvalidComments;
return;
}
if (!(RegVal.Register = findRegisterByName(Parts[0].trim()))) {
errs() << "unknown register '" << Parts[0]
<< "' in 'LLVM-EXEGESIS-DEFREG " << CommentText << "'\n";
++InvalidComments;
return;
}
const StringRef HexValue = Parts[1].trim();
RegVal.Value = APInt(
/* each hex digit is 4 bits */ HexValue.size() * 4, HexValue, 16);
Result->Key.RegisterInitialValues.push_back(std::move(RegVal));
return;
}
if (CommentText.consume_front("LIVEIN")) {
// LLVM-EXEGESIS-LIVEIN <reg>
const auto RegName = CommentText.ltrim();
if (unsigned Reg = findRegisterByName(RegName))
Result->LiveIns.push_back(Reg);
else {
errs() << "unknown register '" << RegName
<< "' in 'LLVM-EXEGESIS-LIVEIN " << CommentText << "'\n";
++InvalidComments;
}
return;
}
}
unsigned numInvalidComments() const { return InvalidComments; }
private:
// We only care about instructions, we don't implement this part of the API.
void emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) override {}
bool emitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override {
return false;
}
void emitValueToAlignment(unsigned ByteAlignment, int64_t Value,
unsigned ValueSize,
unsigned MaxBytesToEmit) override {}
void emitZerofill(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment, SMLoc Loc) override {}
unsigned findRegisterByName(const StringRef RegName) const {
// FIXME: Can we do better than this ?
for (unsigned I = 0, E = RegInfo->getNumRegs(); I < E; ++I) {
if (RegName == RegInfo->getName(I))
return I;
}
errs() << "'" << RegName
<< "' is not a valid register name for the target\n";
return 0;
}
const MCRegisterInfo *const RegInfo;
BenchmarkCode *const Result;
unsigned InvalidComments = 0;
};
} // namespace
// Reads code snippets from file `Filename`.
Expected<std::vector<BenchmarkCode>> readSnippets(const LLVMState &State,
StringRef Filename) {
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferPtr =
MemoryBuffer::getFileOrSTDIN(Filename);
if (std::error_code EC = BufferPtr.getError()) {
return make_error<Failure>("cannot read snippet: " + Filename + ": " +
EC.message());
}
SourceMgr SM;
SM.AddNewSourceBuffer(std::move(BufferPtr.get()), SMLoc());
BenchmarkCode Result;
const TargetMachine &TM = State.getTargetMachine();
MCContext Context(TM.getTargetTriple(), TM.getMCAsmInfo(),
TM.getMCRegisterInfo(), TM.getMCSubtargetInfo());
std::unique_ptr<MCObjectFileInfo> ObjectFileInfo(
TM.getTarget().createMCObjectFileInfo(Context, /*PIC=*/false));
Context.setObjectFileInfo(ObjectFileInfo.get());
Context.initInlineSourceManager();
BenchmarkCodeStreamer Streamer(&Context, TM.getMCRegisterInfo(), &Result);
std::string Error;
raw_string_ostream ErrorStream(Error);
formatted_raw_ostream InstPrinterOStream(ErrorStream);
const std::unique_ptr<MCInstPrinter> InstPrinter(
TM.getTarget().createMCInstPrinter(
TM.getTargetTriple(), TM.getMCAsmInfo()->getAssemblerDialect(),
*TM.getMCAsmInfo(), *TM.getMCInstrInfo(), *TM.getMCRegisterInfo()));
// The following call will take care of calling Streamer.setTargetStreamer.
TM.getTarget().createAsmTargetStreamer(Streamer, InstPrinterOStream,
InstPrinter.get(),
TM.Options.MCOptions.AsmVerbose);
if (!Streamer.getTargetStreamer())
return make_error<Failure>("cannot create target asm streamer");
const std::unique_ptr<MCAsmParser> AsmParser(
createMCAsmParser(SM, Context, Streamer, *TM.getMCAsmInfo()));
if (!AsmParser)
return make_error<Failure>("cannot create asm parser");
AsmParser->getLexer().setCommentConsumer(&Streamer);
const std::unique_ptr<MCTargetAsmParser> TargetAsmParser(
TM.getTarget().createMCAsmParser(*TM.getMCSubtargetInfo(), *AsmParser,
*TM.getMCInstrInfo(),
MCTargetOptions()));
if (!TargetAsmParser)
return make_error<Failure>("cannot create target asm parser");
AsmParser->setTargetParser(*TargetAsmParser);
if (AsmParser->Run(false))
return make_error<Failure>("cannot parse asm file");
if (Streamer.numInvalidComments())
return make_error<Failure>(Twine("found ")
.concat(Twine(Streamer.numInvalidComments()))
.concat(" invalid LLVM-EXEGESIS comments"));
return std::vector<BenchmarkCode>{std::move(Result)};
}
} // namespace exegesis
} // namespace llvm
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