tblgen/AsmMatcher: Emit simple matcher for register names.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76212 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 30 insertions, 3 deletions

diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp
index e0ee944..1d4ad09 100644
--- a/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/utils/TableGen/AsmMatcherEmitter.cpp
@@ -17,8 +17,35 @@
 #include "Record.h"
 using namespace llvm;
 
-void AsmMatcherEmitter::run(raw_ostream &O) {
-  EmitSourceFileHeader("Assembly Matcher Source Fragment", O);
-
+void AsmMatcherEmitter::run(raw_ostream &OS) {
   CodeGenTarget Target;
+  const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
+
+  std::string Namespace = Registers[0].TheDef->getValueAsString("Namespace");
+
+  EmitSourceFileHeader("Assembly Matcher Source Fragment", OS);
+  OS << "namespace llvm {\n\n";
+
+  // Emit the function to match a register name to number.
+
+  if (!Namespace.empty())
+    OS << "namespace " << Namespace << " {\n";
+  OS << "bool MatchRegisterName(const std::string &Name, unsigned &RegNo) {\n";
+
+  // FIXME: TableGen should have a fast string matcher generator.
+  for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
+    const CodeGenRegister &Reg = Registers[i];
+    if (Reg.TheDef->getValueAsString("AsmName").empty())
+      continue;
+
+    OS << "  if (Name == \"" 
+       << Reg.TheDef->getValueAsString("AsmName") << "\")\n"
+       << "    return RegNo=" << i + 1 << ", false;\n";
+  }
+  OS << "  return true;\n";
+  OS << "}\n";
+
+  if (!Namespace.empty())
+    OS << "}\n";
+  OS << "} // End llvm namespace \n";
 }