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MCTargetAsmParser target match predicate support.
Allow a target assembly parser to do context sensitive constraint checking on a potential instruction match. This will be used, for example, to handle Thumb2 IT block parsing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137675 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -18,6 +18,7 @@ class StringRef;
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class SMLoc;
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class AsmToken;
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class MCParsedAsmOperand;
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class MCInst;
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template <typename T> class SmallVectorImpl;
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/// MCTargetAsmParser - Generic interface to target specific assembly parsers.
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@ -28,7 +29,8 @@ public:
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Match_InvalidOperand,
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Match_MissingFeature,
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Match_MnemonicFail,
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Match_Success
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Match_Success,
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FIRST_TARGET_MATCH_RESULT_TY
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};
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private:
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@ -88,6 +90,12 @@ public:
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SmallVectorImpl<MCParsedAsmOperand*> &Operands,
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MCStreamer &Out) = 0;
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/// checkTargetMatchPredicate - Validate the instruction match against
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/// any complex target predicates not expressible via match classes.
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virtual unsigned checkTargetMatchPredicate(MCInst &Inst) {
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return Match_Success;
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}
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};
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} // End llvm namespace
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@ -2981,9 +2981,10 @@ MatchAndEmitInstruction(SMLoc IDLoc,
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MCStreamer &Out) {
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MCInst Inst;
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unsigned ErrorInfo;
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MatchResultTy MatchResult;
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unsigned MatchResult;
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MatchResult = MatchInstructionImpl(Operands, Inst, ErrorInfo);
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switch (MatchResult) {
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default: break;
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case Match_Success:
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// Context sensitive operand constraints aren't handled by the matcher,
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// so check them here.
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@ -323,6 +323,7 @@ MatchAndEmitInstruction(SMLoc IDLoc,
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unsigned ErrorInfo;
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switch (MatchInstructionImpl(Operands, Inst, ErrorInfo)) {
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default: break;
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case Match_Success:
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Out.EmitInstruction(Inst);
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return false;
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@ -981,6 +981,7 @@ MatchAndEmitInstruction(SMLoc IDLoc,
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// First, try a direct match.
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switch (MatchInstructionImpl(Operands, Inst, OrigErrorInfo)) {
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default: break;
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case Match_Success:
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Out.EmitInstruction(Inst);
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return false;
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@ -1019,7 +1020,7 @@ MatchAndEmitInstruction(SMLoc IDLoc,
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// Check for the various suffix matches.
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Tmp[Base.size()] = Suffixes[0];
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unsigned ErrorInfoIgnore;
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MatchResultTy Match1, Match2, Match3, Match4;
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unsigned Match1, Match2, Match3, Match4;
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Match1 = MatchInstructionImpl(Operands, Inst, ErrorInfoIgnore);
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Tmp[Base.size()] = Suffixes[1];
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@ -2179,7 +2179,7 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
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<< " const SmallVectorImpl<MCParsedAsmOperand*> "
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<< "&Operands);\n";
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OS << " bool MnemonicIsValid(StringRef Mnemonic);\n";
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OS << " MatchResultTy MatchInstructionImpl(\n";
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OS << " unsigned MatchInstructionImpl(\n";
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OS << " const SmallVectorImpl<MCParsedAsmOperand*> &Operands,\n";
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OS << " MCInst &Inst, unsigned &ErrorInfo);\n";
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@ -2321,7 +2321,7 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
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OS << "}\n\n";
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// Finally, build the match function.
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OS << Target.getName() << ClassName << "::MatchResultTy "
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OS << "unsigned "
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<< Target.getName() << ClassName << "::\n"
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<< "MatchInstructionImpl(const SmallVectorImpl<MCParsedAsmOperand*>"
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<< " &Operands,\n";
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@ -2348,7 +2348,8 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
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OS << " }\n\n";
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OS << " // Some state to try to produce better error messages.\n";
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OS << " bool HadMatchOtherThanFeatures = false;\n\n";
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OS << " bool HadMatchOtherThanFeatures = false;\n";
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OS << " unsigned RetCode = Match_InvalidOperand;\n";
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OS << " // Set ErrorInfo to the operand that mismatches if it is\n";
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OS << " // wrong for all instances of the instruction.\n";
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OS << " ErrorInfo = ~0U;\n";
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@ -2404,6 +2405,17 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
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OS << " return Match_ConversionFail;\n";
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OS << "\n";
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// Verify the instruction with the target-specific match predicate function.
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OS << " // We have a potential match. Check the target predicate to\n"
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<< " // handle any context sensitive constraints.\n"
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<< " unsigned MatchResult;\n"
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<< " if ((MatchResult = checkTargetMatchPredicate(Inst)) !="
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<< " Match_Success) {\n"
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<< " Inst.clear();\n"
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<< " RetCode = MatchResult;\n"
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<< " continue;\n"
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<< " }\n\n";
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// Call the post-processing function, if used.
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std::string InsnCleanupFn =
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AsmParser->getValueAsString("AsmParserInstCleanup");
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@ -2415,7 +2427,7 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
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OS << " // Okay, we had no match. Try to return a useful error code.\n";
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OS << " if (HadMatchOtherThanFeatures) return Match_MissingFeature;\n";
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OS << " return Match_InvalidOperand;\n";
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OS << " return RetCode;\n";
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OS << "}\n\n";
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if (Info.OperandMatchInfo.size())
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