From 3432d1d1d5684098cdfd6e16f0ab6f209d0973b4 Mon Sep 17 00:00:00 2001
From: Misha Brukman <brukman+llvm@gmail.com>
Date: Tue, 27 May 2003 22:43:19 +0000
Subject: [PATCH] Added a debugging code emitter that prints code to a file,
 debug to std::cerr, and passes the real code to a memory-outputting code
 emitter. This may be removed at a later point in development.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6379 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/MachineCodeEmitter.cpp | 121 +++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)

diff --git a/lib/CodeGen/MachineCodeEmitter.cpp b/lib/CodeGen/MachineCodeEmitter.cpp
index d91efe2cc1b..ae4d7cecec6 100644
--- a/lib/CodeGen/MachineCodeEmitter.cpp
+++ b/lib/CodeGen/MachineCodeEmitter.cpp
@@ -8,6 +8,7 @@
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/Function.h"
 #include <iostream>
+#include <fstream>
 
 namespace {
   struct DebugMachineCodeEmitter : public MachineCodeEmitter {
@@ -59,3 +60,123 @@ namespace {
 MachineCodeEmitter *MachineCodeEmitter::createDebugMachineCodeEmitter() {
   return new DebugMachineCodeEmitter();
 }
+
+namespace {
+  class FilePrinterMachineCodeEmitter : public MachineCodeEmitter {
+    std::ofstream f, actual;
+    std::ostream &o;
+    MachineCodeEmitter *MCE;
+    unsigned counter;
+    bool mustClose;
+    unsigned values[4];
+    
+  public:
+    FilePrinterMachineCodeEmitter() :
+      f("lli.out"), o(f), counter(0), mustClose(true)
+    {
+      if (! f.good()) {
+        std::cerr << "Cannot open 'lli.out' for writing\n";
+        abort();
+      }
+      openActual();
+    }
+
+    FilePrinterMachineCodeEmitter(MachineCodeEmitter &M, std::ostream &os) :
+      o(os), MCE(&M), counter(0)
+    {
+      FilePrinterMachineCodeEmitter();
+      mustClose = false;
+      openActual();
+    }
+
+    ~FilePrinterMachineCodeEmitter() { 
+      o << "\n";
+      actual.close();
+      if (mustClose) f.close();
+    }
+
+    void openActual() {
+      actual.open("lli.actual.obj");
+      if (! actual.good()) {
+        std::cerr << "Cannot open 'lli.actual.obj' for writing\n";
+        abort();
+      }
+    }
+
+    void startFunction(MachineFunction &F) {
+      // resolve any outstanding calls
+      if (MCE) MCE->startFunction(F);
+    }
+    void finishFunction(MachineFunction &F) {
+      if (MCE) MCE->finishFunction(F);
+    }
+
+    void startBasicBlock(MachineBasicBlock &BB) {
+      // if any instructions were waiting for the address of this block,
+      // let them fix their addresses now
+      if (MCE) MCE->startBasicBlock(BB);
+    }
+
+    void startFunctionStub(const Function &F, unsigned StubSize) {
+      //
+      if (MCE) MCE->startFunctionStub(F, StubSize);
+    }
+
+    void *finishFunctionStub(const Function &F) {
+      if (MCE) return MCE->finishFunctionStub(F);
+      else return 0;
+    }
+    
+    void emitByte(unsigned char B) {
+      if (MCE) MCE->emitByte(B);
+
+      values[counter] = (unsigned int) B;
+      if (++counter % 4 == 0 && counter != 0) {
+        o << std::hex;
+        for (unsigned i=0; i<4; ++i) {
+          if (values[i] < 16) o << "0";
+          o << values[i] << " ";
+          actual << values[i];
+        }
+        actual.flush();
+
+        o << std::dec << "\t";
+        for (unsigned i=0; i<4; ++i) {
+          for (int j=7; j>=0; --j) {
+            o << ((values[i] >> j) & 1);
+          }
+          o << " ";
+        }
+
+        o << "\n";
+
+        unsigned instr = 0;
+        for (unsigned i=0; i<4; ++i)
+          instr |= values[i] << (i*8);
+
+        o << "--- * --- * --- * --- * ---\n";
+        counter %= 4;
+      }
+    }
+    void emitPCRelativeDisp(Value *V) {
+      // put block in mapping BB -> { instr, address }. when BB is beginning to
+      // output, find instr, set disp, overwrite instr at addr using the
+      // unsigned value gotten from emitter
+    }
+
+    void emitGlobalAddress(GlobalValue *V, bool isPCRelative) {
+      if (MCE) MCE->emitGlobalAddress(V, isPCRelative);
+    }
+    void emitGlobalAddress(const std::string &Name, bool isPCRelative) {
+      if (MCE) MCE->emitGlobalAddress(Name, isPCRelative);
+    }
+
+    void emitFunctionConstantValueAddress(unsigned ConstantNum, int Offset) {
+      if (MCE) MCE->emitFunctionConstantValueAddress(ConstantNum, Offset);
+    }
+  };
+}
+
+MachineCodeEmitter *MachineCodeEmitter::createFilePrinterMachineCodeEmitter(MachineCodeEmitter &MCE) {
+  return new FilePrinterMachineCodeEmitter(MCE, std::cerr);
+}