MC/Matcher: Add support for over-riding the default MatchInstruction function

name (for example, to allow targets to interpose the actual MatchInstruction
function).

llvm-svn: 102987

2 files changed, 16 insertions, 8 deletions

diff --git a/llvm/include/llvm/Target/Target.td b/llvm/include/llvm/Target/Target.td
index 8e1cc53236f..cc19e0de8eb 100644
--- a/llvm/include/llvm/Target/Target.td
+++ b/llvm/include/llvm/Target/Target.td
@@ -485,10 +485,10 @@ def REG_SEQUENCE : Instruction {
 }
 
 //===----------------------------------------------------------------------===//
-// AsmParser - This class can be implemented by targets that wish to implement 
+// AsmParser - This class can be implemented by targets that wish to implement
 // .s file parsing.
 //
-// Subtargets can have multiple different assembly parsers (e.g. AT&T vs Intel 
+// Subtargets can have multiple different assembly parsers (e.g. AT&T vs Intel
 // syntax on X86 for example).
 //
 class AsmParser {
@@ -501,9 +501,13 @@ class AsmParser {
   // AsmParser class to call on every matched instruction. This can be used to
   // perform target specific instruction post-processing.
   string AsmParserInstCleanup  = "";
- 
+
+  // MatchInstructionName - The name of the instruction matching function to
+  // generate.
+  string MatchInstructionName  = "MatchInstruction";
+
   // Variant - AsmParsers can be of multiple different variants.  Variants are
-  // used to support targets that need to parser multiple formats for the 
+  // used to support targets that need to parser multiple formats for the
   // assembly language.
   int Variant = 0;
 
diff --git a/llvm/utils/TableGen/AsmMatcherEmitter.cpp b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
index e5c068bcdf6..1947824cbf8 100644
--- a/llvm/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
@@ -1564,10 +1564,14 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
          Info.Instructions.begin(), ie = Info.Instructions.end();
        it != ie; ++it)
     MaxNumOperands = std::max(MaxNumOperands, (*it)->Operands.size());
-  
-  OS << "bool " << Target.getName() << ClassName
-     << "::\nMatchInstruction(const SmallVectorImpl<MCParsedAsmOperand*> "
-        "&Operands,\n                 MCInst &Inst) {\n";
+
+  const std::string &MatchName =
+    AsmParser->getValueAsString("MatchInstructionName");
+  OS << "bool " << Target.getName() << ClassName << "::\n"
+     << MatchName
+     << "(const SmallVectorImpl<MCParsedAsmOperand*> &Operands,\n";
+  OS.indent(MatchName.size() + 1);
+  OS << "MCInst &Inst) {\n";
 
   // Emit the static match table; unused classes get initalized to 0 which is
   // guaranteed to be InvalidMatchClass.