95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
//==- X86MnemonicTables.cpp - Generate mnemonic extraction tables. -*- C++ -*-//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This tablegen backend is responsible for emitting tables that group
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// instructions by their mnemonic name wrt AsmWriter Variant (e.g. isADD, etc).
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenInstruction.h"
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#include "CodeGenTarget.h"
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#include "X86RecognizableInstr.h"
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#include "llvm/TableGen/Error.h"
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#include "llvm/TableGen/TableGenBackend.h"
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using namespace llvm;
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namespace {
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class X86MnemonicTablesEmitter {
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CodeGenTarget Target;
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public:
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X86MnemonicTablesEmitter(RecordKeeper &R) : Target(R) {}
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// Output X86 mnemonic tables.
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void run(raw_ostream &OS);
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};
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void X86MnemonicTablesEmitter::run(raw_ostream &OS) {
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emitSourceFileHeader("X86 Mnemonic tables", OS);
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OS << "namespace llvm {\nnamespace X86 {\n\n";
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Record *AsmWriter = Target.getAsmWriter();
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unsigned Variant = AsmWriter->getValueAsInt("Variant");
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// Hold all instructions grouped by mnemonic
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StringMap<SmallVector<const CodeGenInstruction *, 0>> MnemonicToCGInstrMap;
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ArrayRef<const CodeGenInstruction *> NumberedInstructions =
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Target.getInstructionsByEnumValue();
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for (const CodeGenInstruction *I : NumberedInstructions) {
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const Record *Def = I->TheDef;
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// Filter non-X86 instructions.
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if (!Def->isSubClassOf("X86Inst"))
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continue;
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X86Disassembler::RecognizableInstrBase RI(*I);
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if (!RI.shouldBeEmitted())
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continue;
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if ( // Non-parsable instruction defs contain prefix as part of AsmString
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Def->getValueAsString("AsmVariantName") == "NonParsable" ||
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// Skip prefix byte
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RI.Form == X86Local::PrefixByte)
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continue;
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std::string Mnemonic = X86Disassembler::getMnemonic(I, Variant);
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MnemonicToCGInstrMap[Mnemonic].push_back(I);
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}
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OS << "#ifdef GET_X86_MNEMONIC_TABLES_H\n";
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OS << "#undef GET_X86_MNEMONIC_TABLES_H\n\n";
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for (StringRef Mnemonic : MnemonicToCGInstrMap.keys())
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OS << "bool is" << Mnemonic << "(unsigned Opcode);\n";
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OS << "#endif // GET_X86_MNEMONIC_TABLES_H\n\n";
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OS << "#ifdef GET_X86_MNEMONIC_TABLES_CPP\n";
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OS << "#undef GET_X86_MNEMONIC_TABLES_CPP\n\n";
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for (StringRef Mnemonic : MnemonicToCGInstrMap.keys()) {
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OS << "bool is" << Mnemonic << "(unsigned Opcode) {\n";
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auto Mnemonics = MnemonicToCGInstrMap[Mnemonic];
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if (Mnemonics.size() == 1) {
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const CodeGenInstruction *CGI = *Mnemonics.begin();
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OS << "\treturn Opcode == " << CGI->TheDef->getName() << ";\n}\n\n";
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} else {
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OS << "\tswitch (Opcode) {\n";
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for (const CodeGenInstruction *CGI : Mnemonics) {
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OS << "\tcase " << CGI->TheDef->getName() << ":\n";
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}
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OS << "\t\treturn true;\n\t}\n\treturn false;\n}\n\n";
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}
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}
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OS << "#endif // GET_X86_MNEMONIC_TABLES_CPP\n\n";
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OS << "} // end namespace X86\n} // end namespace llvm";
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}
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} // namespace
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namespace llvm {
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void EmitX86MnemonicTables(RecordKeeper &RK, raw_ostream &OS) {
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X86MnemonicTablesEmitter(RK).run(OS);
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}
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} // namespace llvm
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