Checkin debug implementation of MCE

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4893 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineCodeEmitter.cpp

@@ -0,0 +1,41 @@
+//===-- MachineCodeEmitter.cpp - Implement the MachineCodeEmitter itf -----===//
+//
+// This file implements the MachineCodeEmitter interface.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/Function.h"
+#include <iostream>
+
+namespace {
+  struct DebugMachineCodeEmitter : public MachineCodeEmitter {
+    void startFunction(MachineFunction &F) {
+      std::cout << "\n**** Writing machine code for function: "
+                << F.getFunction()->getName() << "\n";
+    }
+    void finishFunction(MachineFunction &F) {
+      std::cout << "\n";
+    }
+    void startBasicBlock(MachineBasicBlock &BB) {
+      std::cout << "\n--- Basic Block: " << BB.getBasicBlock()->getName()<<"\n";
+    }
+    
+    void emitByte(unsigned char B) {
+      std::cout << "0x" << std::hex << (unsigned int)B << std::dec << " ";
+    }
+    void emitPCRelativeDisp(Value *V) {
+      std::cout << "<" << V->getName() << ": 0xXX 0xXX 0xXX 0xXX> ";
+    }
+  };
+}
+
+
+/// createDebugMachineCodeEmitter - Return a dynamically allocated machine
+/// code emitter, which just prints the opcodes and fields out the cout.  This
+/// can be used for debugging users of the MachineCodeEmitter interface.
+///
+MachineCodeEmitter *MachineCodeEmitter::createDebugMachineCodeEmitter() {
+  return new DebugMachineCodeEmitter();
+}