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Allow targets to add custom asm operand matching logic.

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For example, ARM has several instructions with a literal '#0' immediate in the syntax
that's not represented as an actual operand. The asm matcher is expected a token
operand, but the parser will have created an immediate operand. This is currently
handled by dedicated per-instruction C++ munging of the ParsedAsmOperand list, but
will be better handled by this hook.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174487 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2013-02-06 06:00:06 +00:00
parent b2ac7c09b1
commit fa05def52c
2 changed files with 18 additions and 0 deletions
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utils/TableGen/AsmMatcherEmitter.cpp
+9
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@@ -2878,6 +2878,15 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
OS << "(MatchClassKind)it->Classes[i]);\n";
OS << " if (Diag == Match_Success)\n";
OS << " continue;\n";
OS << " // If the generic handler indicates an invalid operand\n";
OS << " // failure, check for a special case.\n";
OS << " if (Diag == Match_InvalidOperand) {\n";
OS << " Diag = validateTargetOperandClass(Operands[i+1],\n";
OS.indent(43);
OS << "(MatchClassKind)it->Classes[i]);\n";
OS << " if (Diag == Match_Success)\n";
OS << " continue;\n";
OS << " }\n";
OS << " // If this operand is broken for all of the instances of this\n";
OS << " // mnemonic, keep track of it so we can report loc info.\n";
OS << " // If we already had a match that only failed due to a\n";