Initial checkin of register info emitter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7465 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 68 insertions, 0 deletions

diff --git a/support/tools/TableGen/RegisterInfoEmitter.cpp b/support/tools/TableGen/RegisterInfoEmitter.cpp
new file mode 100644
index 0000000000..200800fae6
--- /dev/null
+++ b/support/tools/TableGen/RegisterInfoEmitter.cpp
@@ -0,0 +1,40 @@
+//===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===//
+//
+// This tablegen backend is responsible for emitting a description of a target
+// register file for a code generator.  It uses instances of the Register,
+// RegisterAliases, and RegisterClass classes to gather this information.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RegisterInfoEmitter.h"
+#include "Record.h"
+
+static void EmitSourceHeader(const std::string &Desc, std::ostream &o) {
+  o << "//===- TableGen'erated file -------------------------------------*-"
+       " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"
+       "d file, do not edit!\n//\n//===------------------------------------"
+       "----------------------------------===//\n\n";
+}
+
+void RegisterInfoEmitter::runHeader(std::ostream &OS) {
+  std::vector<Record*> RegisterInfos =
+    Records.getAllDerivedDefinitions("RegisterInfo");
+
+  if (RegisterInfos.size() != 1)
+    throw std::string("ERROR: Multiple subclasses of RegisterInfo defined!");
+
+  EmitSourceHeader("Register Information Header Fragment", OS);
+
+  std::string ClassName = RegisterInfos[0]->getValueAsString("ClassName");
+
+  OS << "#include \"llvm/CodeGen/MRegisterInfo.h\"\n\n";
+
+  OS << "struct " << ClassName << ": public MRegisterInfo {\n"
+     << "  " << ClassName << "();\n"
+     << "  const unsigned* getCalleeSaveRegs() const;\n"
+     << "};\n\n";
+}
+
+void RegisterInfoEmitter::run(std::ostream &o) {
+
+}
diff --git a/support/tools/TableGen/RegisterInfoEmitter.h b/support/tools/TableGen/RegisterInfoEmitter.h
new file mode 100644
index 0000000000..2a5d70a0fd
--- /dev/null
+++ b/support/tools/TableGen/RegisterInfoEmitter.h
@@ -0,0 +1,28 @@
+//===- RegisterInfoEmitter.h - Generate a Register File Desc. ---*- C++ -*-===//
+//
+// This tablegen backend is responsible for emitting a description of a target
+// register file for a code generator.  It uses instances of the Register,
+// RegisterAliases, and RegisterClass classes to gather this information.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef REGISTER_INFO_EMITTER_H
+#define REGISTER_INFO_EMITTER_H
+
+#include <iosfwd>
+class RecordKeeper;
+
+class RegisterInfoEmitter {
+  RecordKeeper &Records;
+public:
+  RegisterInfoEmitter(RecordKeeper &R) : Records(R) {}
+  
+  // run - Output the register file description, returning true on failure.
+  void run(std::ostream &o);
+
+  // runHeader - Emit a header fragment for the register info emitter.
+  void runHeader(std::ostream &o);
+private:
+};
+
+#endif