Remove this from the main tree. I'll host it out of tree.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112529 91177308-0d34-0410-b5e6-96231b3b80d8

8 files changed, 0 insertions, 848 deletions

diff --git a/examples/TracingBrainF/BrainF.h b/examples/TracingBrainF/BrainF.h
deleted file mode 100644
index c5a91b94f6..0000000000
--- a/examples/TracingBrainF/BrainF.h
+++ /dev/null
@@ -1,77 +0,0 @@
-//===-- BrainF.h - BrainF compiler class ----------------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===--------------------------------------------------------------------===//
-
-#ifndef BRAINF_H
-#define BRAINF_H
-
-#include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
-#include "llvm/ExecutionEngine/GenericValue.h"
-#include "llvm/ExecutionEngine/JIT.h"
-#include "llvm/PassManager.h"
-#include "llvm/Support/IRBuilder.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/DenseSet.h"
-
-
-using namespace llvm;
-
-class BrainFTraceRecorder {
-  struct BrainFTraceNode {
-    uint8_t opcode;
-    size_t pc;
-    BrainFTraceNode(uint8_t o, size_t p)
-      : opcode(o), pc(p), left(0), right(0) { }
-    void dump(unsigned level);
-    
-    // On an if, left is the x != 0 edge.
-    // A value of 0 indicates an un-traced edge.
-    // A value of ~0ULL indicates an edge to the trace head.
-    BrainFTraceNode *left, *right;
-  };
-  
-  uint8_t prev_opcode;
-  uint8_t *iteration_count;
-  std::pair<uint8_t, size_t> *trace_begin, *trace_end, *trace_tail;
-  DenseMap<size_t, BrainFTraceNode*> trace_map;
-  Module *module;
-  BasicBlock *Header;
-  Value *DataPtr;
-  PHINode *HeaderPHI;
-  ExecutionEngine *EE;
-
-  const IntegerType *int_type;
-  const FunctionType *op_type;
-  GlobalValue *bytecode_array, *executed_flag;
-  Value *getchar_func, *putchar_func;
-  FunctionPassManager *FPM;
-  
-  
-  void commit();
-  void initialize_module();
-  void compile(BrainFTraceNode* trace);
-  void compile_opcode(BrainFTraceNode *node, IRBuilder<>& builder);
-  void compile_plus(BrainFTraceNode *node, IRBuilder<>& builder);
-  void compile_minus(BrainFTraceNode *node, IRBuilder<>& builder);
-  void compile_left(BrainFTraceNode *node, IRBuilder<>& builder);
-  void compile_right(BrainFTraceNode *node, IRBuilder<>& builder);
-  void compile_put(BrainFTraceNode *node, IRBuilder<>& builder);
-  void compile_get(BrainFTraceNode *node, IRBuilder<>& builder);
-  void compile_if(BrainFTraceNode *node, IRBuilder<>& builder);
-  void compile_back(BrainFTraceNode *node, IRBuilder<>& builder);                                        
-  
-public:
-  BrainFTraceRecorder();
-  ~BrainFTraceRecorder();
-  
-  void record(size_t pc, uint8_t opcode);
-  void record_simple(size_t pc, uint8_t opcode);
-};
-
-#endif
diff --git a/examples/TracingBrainF/BrainFCodeGen.cpp b/examples/TracingBrainF/BrainFCodeGen.cpp
deleted file mode 100644
index 87965460ce..0000000000
--- a/examples/TracingBrainF/BrainFCodeGen.cpp
+++ /dev/null
@@ -1,351 +0,0 @@
-//===-- BrainFCodeGen.cpp - BrainF trace compiler -----------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===--------------------------------------------------------------------===//
-
-#include "BrainF.h"
-#include "BrainFVM.h"
-#include "llvm/Attributes.h"
-#include "llvm/Support/StandardPasses.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetSelect.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/ADT/StringExtras.h"
-
-/// initialize_module - perform setup of the LLVM code generation system.
-void BrainFTraceRecorder::initialize_module() {
-  LLVMContext &Context = module->getContext();
-  
-  // Initialize the code generator, and enable aggressive code generation.
-  InitializeNativeTarget();
-  EngineBuilder builder(module);
-  builder.setOptLevel(CodeGenOpt::Aggressive);
-  EE = builder.create();
-  
-  // Create a FunctionPassManager to handle running optimization passes
-  // on our generated code.  Setup a basic suite of optimizations for it.
-  FPM = new llvm::FunctionPassManager(module);
-  FPM->add(createInstructionCombiningPass());
-  FPM->add(createCFGSimplificationPass());
-  FPM->add(createScalarReplAggregatesPass());
-  FPM->add(createSimplifyLibCallsPass());
-  FPM->add(createInstructionCombiningPass());
-  FPM->add(createJumpThreadingPass());
-  FPM->add(createCFGSimplificationPass());
-  FPM->add(createInstructionCombiningPass());
-  FPM->add(createCFGSimplificationPass());
-  FPM->add(createReassociatePass());
-  FPM->add(createLoopRotatePass());
-  FPM->add(createLICMPass());
-  FPM->add(createLoopUnswitchPass(false));
-  FPM->add(createInstructionCombiningPass());  
-  FPM->add(createIndVarSimplifyPass());
-  FPM->add(createLoopDeletionPass());
-  FPM->add(createLoopUnrollPass());
-  FPM->add(createInstructionCombiningPass());
-  FPM->add(createGVNPass());
-  FPM->add(createSCCPPass());
-  FPM->add(createInstructionCombiningPass());
-  FPM->add(createJumpThreadingPass());
-  FPM->add(createDeadStoreEliminationPass());
-  FPM->add(createAggressiveDCEPass());
-  FPM->add(createCFGSimplificationPass());
-  
-  // Cache the LLVM type signature of an opcode function
-  int_type = sizeof(size_t) == 4 ? 
-                  IntegerType::getInt32Ty(Context) : 
-                  IntegerType::getInt64Ty(Context);
-  const Type *data_type =
-    PointerType::getUnqual(IntegerType::getInt8Ty(Context));
-  std::vector<const Type*> args;
-  args.push_back(int_type);
-  args.push_back(data_type);
-  op_type =
-    FunctionType::get(Type::getVoidTy(Context), args, false);
-  
-  // Setup a global variable in the LLVM module to represent the bytecode
-  // array.  Bind it to the actual bytecode array at JIT time.
-  const Type *bytecode_type = PointerType::getUnqual(op_type);
-  bytecode_array = cast<GlobalValue>(module->
-    getOrInsertGlobal("BytecodeArray", bytecode_type));
-  EE->addGlobalMapping(bytecode_array, BytecodeArray);
-  
-  // Setup a similar mapping for the global executed flag.
-  const IntegerType *flag_type = IntegerType::get(Context, 8);
-  executed_flag =
-    cast<GlobalValue>(module->getOrInsertGlobal("executed", flag_type));
-  EE->addGlobalMapping(executed_flag, &executed);
-
-  // Cache LLVM declarations for putchar() and getchar().
-  const Type *int_type = sizeof(int) == 4 ? IntegerType::getInt32Ty(Context)
-                                       : IntegerType::getInt64Ty(Context);
-  putchar_func =
-    module->getOrInsertFunction("putchar", int_type, int_type, NULL);
-  getchar_func = module->getOrInsertFunction("getchar", int_type, NULL);
-}
-
-void BrainFTraceRecorder::compile(BrainFTraceNode* trace) {
-  LLVMContext &Context = module->getContext();
-  
-  // Create a new function for the trace we're compiling.
-  Function *curr_func = cast<Function>(module->
-    getOrInsertFunction("trace_"+utostr(trace->pc), op_type));
-  
-  // Create an entry block, which branches directly to a header block.
-  // This is necessary because the entry block cannot be the target of
-  // a loop.
-  BasicBlock *Entry = BasicBlock::Create(Context, "entry", curr_func);
-  Header = BasicBlock::Create(Context, utostr(trace->pc), curr_func);
-  
-  // Mark the array pointer as noalias, and setup compiler state.
-  IRBuilder<> builder(Entry);
-  Argument *Arg1 = ++curr_func->arg_begin();
-  Arg1->addAttr(Attribute::NoAlias);
-  DataPtr = Arg1;
-  
-  // Emit code to set the executed flag.  This signals to the recorder
-  // that the preceding opcode was executed as a part of a compiled trace.
-  const IntegerType *flag_type = IntegerType::get(Context, 8);
-  ConstantInt *True = ConstantInt::get(flag_type, 1);
-  builder.CreateStore(True, executed_flag);
-  builder.CreateBr(Header);
-  
-  // Header will be the root of our trace tree.  As such, all loop back-edges
-  // will be targetting it.  Setup a PHI node to merge together incoming values
-  // for the current array pointer as we loop.
-  builder.SetInsertPoint(Header);
-  HeaderPHI = builder.CreatePHI(DataPtr->getType());
-  HeaderPHI->addIncoming(DataPtr, Entry);
-  DataPtr = HeaderPHI;
-  
-  // Recursively descend the trace tree, emitting code for the opcodes as we go.
-  compile_opcode(trace, builder);
-
-  // Run out optimization suite on our newly generated trace.
-  FPM->run(*curr_func);
-  
-  // Compile our trace to machine code, and install function pointer to it
-  // into the bytecode array so that it will be executed every time the 
-  // trace-head PC is reached.
-  void *code = EE->getPointerToFunction(curr_func);
-  BytecodeArray[trace->pc] =
-    (opcode_func_t)(intptr_t)code;
-}
-
-/// compile_plus - Emit code for '+'
-void BrainFTraceRecorder::compile_plus(BrainFTraceNode *node,
-                                       IRBuilder<>& builder) {
-  Value *CellValue = builder.CreateLoad(DataPtr);
-  Constant *One =
-    ConstantInt::get(IntegerType::getInt8Ty(Header->getContext()), 1);
-  Value *UpdatedValue = builder.CreateAdd(CellValue, One);
-  builder.CreateStore(UpdatedValue, DataPtr);
-  
-  if (node->left != (BrainFTraceNode*)~0ULL)
-    compile_opcode(node->left, builder);
-  else {
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-    builder.CreateBr(Header);
-  }
-}
-
-/// compile_minus - Emit code for '-'   
-void BrainFTraceRecorder::compile_minus(BrainFTraceNode *node,
-                                        IRBuilder<>& builder) {
-  Value *CellValue = builder.CreateLoad(DataPtr);
-  Constant *One =
-    ConstantInt::get(IntegerType::getInt8Ty(Header->getContext()), 1);
-  Value *UpdatedValue = builder.CreateSub(CellValue, One);
-  builder.CreateStore(UpdatedValue, DataPtr);
-  
-  if (node->left != (BrainFTraceNode*)~0ULL)
-    compile_opcode(node->left, builder);
-  else {
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-    builder.CreateBr(Header);
-  }
-}
-                                          
-/// compile_left - Emit code for '<'                                  
-void BrainFTraceRecorder::compile_left(BrainFTraceNode *node,
-                                       IRBuilder<>& builder) {
-  Value *OldPtr = DataPtr;
-  DataPtr = builder.CreateConstInBoundsGEP1_32(DataPtr, -1);
-  if (node->left != (BrainFTraceNode*)~0ULL)
-    compile_opcode(node->left, builder);
-  else {
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-    builder.CreateBr(Header);
-  }
-  DataPtr = OldPtr;
-}
-
-/// compile_right - Emit code for '>'                                                                               
-void BrainFTraceRecorder::compile_right(BrainFTraceNode *node,
-                                        IRBuilder<>& builder) {
-  Value *OldPtr = DataPtr;
-  DataPtr = builder.CreateConstInBoundsGEP1_32(DataPtr, 1);
-  if (node->left != (BrainFTraceNode*)~0ULL)
-    compile_opcode(node->left, builder);
-  else {
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-    builder.CreateBr(Header);
-  }
-  DataPtr = OldPtr;
-}
- 
- 
-/// compile_put - Emit code for '.'                                                                                                                                                         
-void BrainFTraceRecorder::compile_put(BrainFTraceNode *node,
-                                      IRBuilder<>& builder) {
-  Value *Loaded = builder.CreateLoad(DataPtr);
-  Value *Print =
-    builder.CreateSExt(Loaded, IntegerType::get(Loaded->getContext(), 32));
-  builder.CreateCall(putchar_func, Print);
-  if (node->left != (BrainFTraceNode*)~0ULL)
-    compile_opcode(node->left, builder);
-  else {
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-    builder.CreateBr(Header);
-  }
-}
-
-/// compile_get - Emit code for ','
-void BrainFTraceRecorder::compile_get(BrainFTraceNode *node,
-                                      IRBuilder<>& builder) {
-  Value *Ret = builder.CreateCall(getchar_func);
-  Value *Trunc =
-    builder.CreateTrunc(Ret, IntegerType::get(Ret->getContext(), 8));
-  builder.CreateStore(Ret, Trunc);
-  if (node->left != (BrainFTraceNode*)~0ULL)
-    compile_opcode(node->left, builder);
-  else {
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-    builder.CreateBr(Header);
-  }
-}
-
-/// compile_if - Emit code for '['
-void BrainFTraceRecorder::compile_if(BrainFTraceNode *node,
-                                     IRBuilder<>& builder) {
-  BasicBlock *ZeroChild = 0;
-  BasicBlock *NonZeroChild = 0;
-  
-  IRBuilder<> oldBuilder = builder;
-  
-  LLVMContext &Context = Header->getContext();
-  
-  // If both directions of the branch go back to the trace-head, just
-  // jump there directly.
-  if (node->left == (BrainFTraceNode*)~0ULL &&
-      node->right == (BrainFTraceNode*)~0ULL) {
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-    builder.CreateBr(Header);
-    return;
-  }
-  
-  // Otherwise, there are two cases to handle for each direction:
-  //   ~0ULL - A branch back to the trace head
-  //   0 - A branch out of the trace
-  //   * - A branch to a node we haven't compiled yet.
-  // Go ahead and generate code for both targets.
-  
-  if (node->left == (BrainFTraceNode*)~0ULL) {
-    NonZeroChild = Header;
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-  } else if (node->left == 0) {
-    NonZeroChild = BasicBlock::Create(Context,
-                                   "exit_left_"+utostr(node->pc),
-                                   Header->getParent());
-    builder.SetInsertPoint(NonZeroChild);
-    ConstantInt *NewPc = ConstantInt::get(int_type, node->pc+1);
-    Value *BytecodeIndex =
-      builder.CreateConstInBoundsGEP1_32(bytecode_array, node->pc+1);
-    Value *Target = builder.CreateLoad(BytecodeIndex);
-    CallInst *Call =cast<CallInst>(builder.CreateCall2(Target, NewPc, DataPtr));
-    Call->setTailCall();
-    builder.CreateRetVoid();
-  } else {
-    NonZeroChild = BasicBlock::Create(Context, 
-                                      utostr(node->left->pc), 
-                                      Header->getParent());
-    builder.SetInsertPoint(NonZeroChild);
-    compile_opcode(node->left, builder);
-  }
-  
-  if (node->right == (BrainFTraceNode*)~0ULL) {
-    ZeroChild = Header;
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-  } else if (node->right == 0) {
-    ZeroChild = BasicBlock::Create(Context,
-                                   "exit_right_"+utostr(node->pc),
-                                   Header->getParent());
-    builder.SetInsertPoint(ZeroChild);
-    ConstantInt *NewPc = ConstantInt::get(int_type, JumpMap[node->pc]+1);
-    Value *BytecodeIndex =
-      builder.CreateConstInBoundsGEP1_32(bytecode_array, JumpMap[node->pc]+1);
-    Value *Target = builder.CreateLoad(BytecodeIndex);
-    CallInst *Call =cast<CallInst>(builder.CreateCall2(Target, NewPc, DataPtr));
-    Call->setTailCall();
-    builder.CreateRetVoid();
-  } else {
-    ZeroChild = BasicBlock::Create(Context, 
-                                      utostr(node->right->pc), 
-                                      Header->getParent());
-    builder.SetInsertPoint(ZeroChild);
-    compile_opcode(node->right, builder);
-  }
-  
-  // Generate the test and branch to select between the targets.
-  Value *Loaded = oldBuilder.CreateLoad(DataPtr);
-  Value *Cmp = oldBuilder.CreateICmpEQ(Loaded, 
-                                       ConstantInt::get(Loaded->getType(), 0));
-  oldBuilder.CreateCondBr(Cmp, ZeroChild, NonZeroChild);
-}
-
-/// compile_back - Emit code for ']'
-void BrainFTraceRecorder::compile_back(BrainFTraceNode *node,
-                                       IRBuilder<>& builder) {
-  if (node->right != (BrainFTraceNode*)~0ULL)
-    compile_opcode(node->right, builder);
-  else {
-    HeaderPHI->addIncoming(DataPtr, builder.GetInsertBlock());
-    builder.CreateBr(Header);
-  }
-}
-
-/// compile_opcode - Dispatch to a more specific compiler function based
-/// on the opcode of the current node.
-void BrainFTraceRecorder::compile_opcode(BrainFTraceNode *node,
-                                         IRBuilder<>& builder) {
-  switch (node->opcode) {
-    case '+':
-      compile_plus(node, builder);
-      break;
-    case '-':
-      compile_minus(node, builder);
-      break;
-    case '<':
-      compile_left(node, builder);
-      break;
-    case '>':
-      compile_right(node, builder);
-      break;
-    case '.':
-      compile_put(node, builder);
-      break;
-    case ',':
-      compile_get(node, builder);
-      break;
-    case '[':
-      compile_if(node, builder);
-      break;
-    case ']':
-      compile_back(node, builder);
-      break;
-  }
-}
diff --git a/examples/TracingBrainF/BrainFInterpreter.cpp b/examples/TracingBrainF/BrainFInterpreter.cpp
deleted file mode 100644
index c059afd354..0000000000
--- a/examples/TracingBrainF/BrainFInterpreter.cpp
+++ /dev/null
@@ -1,116 +0,0 @@
-//===-- BrainFInterpreter.cpp - BrainF trace compiler interpreter -------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===--------------------------------------------------------------------===//
-
-#include "BrainF.h"
-#include "BrainFVM.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cstdio>
-using namespace llvm;
-
-//Command line options
-
-static cl::opt<std::string>
-InputFilename(cl::Positional, cl::desc("<input brainf>"));
-
-int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " BrainF compiler\n");
-
-  if (InputFilename == "") {
-    errs() << "Error: You must specify the filename of the program to "
-    "be compiled.  Use --help to see the options.\n";
-    abort();
-  }
-
-  // Read the input file.
-  MemoryBuffer *Code = MemoryBuffer::getFileOrSTDIN(InputFilename);
-  const uint8_t *CodeBegin = (const uint8_t*)(Code->getBufferStart());
-  
-  // Create a new buffer to hold the preprocessed code.
-  MemoryBuffer *ParsedCode =
-    MemoryBuffer::getNewMemBuffer(sizeof(opcode_func_t) * 
-                                  (Code->getBufferSize()+1));
-  BytecodeArray = (opcode_func_t*)(ParsedCode->getBufferStart());
-  size_t BytecodeOffset = 0;
-  
-  // Create JumpMap, a special on-the-side data array used to implement
-  // efficient jumps in the interpreter.
-  JumpMap = new size_t[Code->getBufferSize()];
-  memset(JumpMap, 0, sizeof(size_t) * Code->getBufferSize());
-  std::vector<size_t> Stack;
-  
-  // Preprocess the input source code, performing three tasks:
-  //  1 - Remove non-instruction characters
-  //  2 - Replace character literals with opcode function pointers
-  //  3 - Precompute the jump targets for [ and ] instructions in JumpMap
-  for (size_t i = 0; i < Code->getBufferSize(); ++i) {
-    uint8_t opcode = CodeBegin[i];
-    switch (opcode) {
-      case '>':
-        BytecodeArray[BytecodeOffset++] = &op_right;
-        break;
-      case '<':
-        BytecodeArray[BytecodeOffset++] = &op_left;
-        break;
-      case '+':
-        BytecodeArray[BytecodeOffset++] = &op_plus;
-        break;
-      case '-':
-        BytecodeArray[BytecodeOffset++] = &op_minus;
-        break;
-      case '.':
-        BytecodeArray[BytecodeOffset++] = &op_put;
-        break;
-      case ',':
-        BytecodeArray[BytecodeOffset++] = &op_get;
-        break;
-      case '[':
-        Stack.push_back(BytecodeOffset);
-        BytecodeArray[BytecodeOffset++] = &op_if;
-        break;
-      case ']':
-        JumpMap[Stack.back()] = BytecodeOffset;
-        JumpMap[BytecodeOffset] = Stack.back();
-        Stack.pop_back();
-        BytecodeArray[BytecodeOffset++] = &op_back;
-        break;
-      default:
-        continue;
-    }
-  }
-  
-  // Fill in the suffix of the preprocessed source for op_exit.
-  // Thus, if we reach the end of the source, the program will terminate.
-  while (BytecodeOffset < Code->getBufferSize()+1) {
-    BytecodeArray[BytecodeOffset++] = &op_end;
-  }
-  
-  // Setup the array.
-  uint8_t *BrainFArray = new uint8_t[32768];
-  memset(BrainFArray, 0, 32768);
-  
-  // Setup the trace recorder.
-  Recorder = new BrainFTraceRecorder();
-  
-  // Main interpreter loop.
-  // Note the lack of a explicit loop: every opcode is a tail-recursive
-  // function that calls its own successor by indexing into BytecodeArray.
-  uint8_t* data = BrainFArray;  
-  BytecodeArray[0](0, data);
-  
-  //Clean up
-  delete Recorder;
-  delete Code;
-  delete ParsedCode;
-  delete[] BrainFArray;
-  delete[] JumpMap;
-
-  return 0;
-}
diff --git a/examples/TracingBrainF/BrainFOpcodes.cpp b/examples/TracingBrainF/BrainFOpcodes.cpp
deleted file mode 100644
index f6c22a3458..0000000000
--- a/examples/TracingBrainF/BrainFOpcodes.cpp
+++ /dev/null
@@ -1,68 +0,0 @@
-//===-- BrainFOpcodes.cpp - BrainF interpreter opcodes ------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===--------------------------------------------------------------------===//
-
-#include "BrainFVM.h"
-#include <cstdio>
-
-opcode_func_t *BytecodeArray = 0;
-size_t *JumpMap = 0;
-uint8_t executed = 0;
-
-BrainFTraceRecorder *Recorder = 0;
-
-void op_plus(size_t pc, uint8_t *data) {
-  Recorder->record_simple(pc, '+');
-  *data += 1;
-  BytecodeArray[pc+1](pc+1, data);
-}
-
-void op_minus(size_t pc, uint8_t *data) {
-  Recorder->record_simple(pc, '-');
-  *data -= 1;
-  BytecodeArray[pc+1](pc+1, data);
-}
-
-void op_left(size_t pc, uint8_t *data) {
-  Recorder->record_simple(pc, '<');
-  BytecodeArray[pc+1](pc+1, data-1);
-}
-
-void op_right(size_t pc, uint8_t *data) {
-  Recorder->record_simple(pc, '>');
-  BytecodeArray[pc+1](pc+1, data+1);
-}
-
-void op_put(size_t pc, uint8_t *data) {
-  Recorder->record_simple(pc, '.');
-  putchar(*data);
-  BytecodeArray[pc+1](pc+1, data);
-}
-
-void op_get(size_t pc, uint8_t *data) {
-  Recorder->record_simple(pc, ',');
-  *data = getchar();
-  BytecodeArray[pc+1](pc+1, data);
-}
-
-void op_if(size_t pc, uint8_t *data) {
-  Recorder->record(pc, '[');
-  size_t new_pc = pc+1;
-  if (!*data) new_pc = JumpMap[pc]+1;
-  BytecodeArray[new_pc](new_pc, data);
-}
-
-void op_back(size_t pc, uint8_t *data) {
-  Recorder->record_simple(pc, ']');
-  size_t new_pc = JumpMap[pc];
-  BytecodeArray[new_pc](new_pc, data);
-}
-
-void op_end(size_t, uint8_t *) {
-  return;
-}
diff --git a/examples/TracingBrainF/BrainFTraceRecorder.cpp b/examples/TracingBrainF/BrainFTraceRecorder.cpp
deleted file mode 100644
index cd8babd199..0000000000
--- a/examples/TracingBrainF/BrainFTraceRecorder.cpp
+++ /dev/null
@@ -1,155 +0,0 @@
-//===-- BrainFTraceRecorder.cpp - BrainF trace recorder ------------------==//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===--------------------------------------------------------------------===//
-// 
-// This class observes the execution trace of the interpreter, identifying
-// hot traces and eventually compiling them to native code.
-//
-// The operation of the recorder can be divided into four parts:
-//   1) Interation Counting - To identify hot traces, we track the execution
-//      counts of all loop headers ('[' instructions).  We use a fixed-size
-//      array of counters for this, since lack of precision does not affect
-//      correctness.
-//
-//   2) Trace Buffering - Once a header has passed a hotness threshold, we 
-//      begin buffering the execution trace beginning from that header the
-//      next time it is executed.  This buffer is of a fixed length, though
-//      that choice can be tuned for performance.  If the end of the buffer
-//      is reached without execution returning to the header, we throw out
-//      the trace.
-//
-//   3) Trace Commit - If the buffered trace returns to the header before 
-//      the buffer limit is reached, that trace is commited to form a trace
-//      tree.  This tree aggregates all execution traces that have been 
-//      observed originating from the header since it passed the hotness
-//      threshold.  The buffer is then cleared to allow a new trace to be
-//      recorded.
-//
-//   4) Trace Compilation - Once a secondary hotness threshold is reached,
-//      trace recording is terminated and the set of observed traces encoded
-//      in the trace tree are compiled to native code, and a function pointer
-//      to that trace is installed into the bytecode array in place of one of
-//      the normal opcode functions.  Details of this compilation are in
-//      BrainFCodeGen.cpp
-//===--------------------------------------------------------------------===//
-
-#include "BrainF.h"
-#include "BrainFVM.h"
-#include "llvm/Support/raw_ostream.h"
-
-#define ITERATION_BUF_SIZE  1024
-#define TRACE_BUF_SIZE       256
-#define TRACE_THRESHOLD      50
-#define COMPILE_THRESHOLD    200
-
-void BrainFTraceRecorder::BrainFTraceNode::dump(unsigned lvl) {
-  for (unsigned i = 0; i < lvl; ++i)
-    outs() << '.';
-  outs() << opcode << " : " << pc << "\n";
-  if (left && left != (BrainFTraceNode*)~0ULL) left->dump(lvl+1);
-  if (right && right != (BrainFTraceNode*)~0ULL) right->dump(lvl+1);
-}
-
-BrainFTraceRecorder::BrainFTraceRecorder()
-  : prev_opcode('+'), iteration_count(new uint8_t[ITERATION_BUF_SIZE]),
-    trace_begin(new std::pair<uint8_t, size_t>[TRACE_BUF_SIZE]),
-    trace_end(trace_begin + TRACE_BUF_SIZE),
-    trace_tail(trace_begin),
-    module(new Module("BrainF", getGlobalContext())) {
-  memset(iteration_count, 0, ITERATION_BUF_SIZE);
-  memset(trace_begin, 0, sizeof(std::pair<uint8_t, size_t>) * TRACE_BUF_SIZE);
-  
-  initialize_module();
-}
-
-BrainFTraceRecorder::~BrainFTraceRecorder() {
-  delete[] iteration_count;
-  delete[] trace_begin;
-  delete FPM;
-  delete EE;
-}
-
-void BrainFTraceRecorder::commit() {
-  BrainFTraceNode *&Head = trace_map[trace_begin->second];
-  if (!Head)
-    Head = new BrainFTraceNode(trace_begin->first, trace_begin->second);
-  
-  BrainFTraceNode *Parent = Head;
-  std::pair<uint8_t, size_t> *trace_iter = trace_begin+1;
-  while (trace_iter != trace_tail) {
-    BrainFTraceNode *Child = 0;
-    
-    if (trace_iter->second == Parent->pc+1) {
-      if (Parent->left) Child = Parent->left;
-      else Child = Parent->left =
-        new BrainFTraceNode(trace_iter->first, trace_iter->second);
-    } else {
-      if (Parent->right) Child = Parent->right;
-      else Child = Parent->right =
-        new BrainFTraceNode(trace_iter->first, trace_iter->second);
-    }
-    
-    Parent = Child;
-    ++trace_iter;
-  }
-  
-  if (Parent->pc+1 == Head->pc)
-    Parent->left = (BrainFTraceNode*)~0ULL;
-  else
-    Parent->right = (BrainFTraceNode*)~0ULL;
-}
-
-void BrainFTraceRecorder::record_simple(size_t pc, uint8_t opcode) {
-  if (executed) {
-    executed = false;
-    trace_tail = trace_begin;
-  }
-  
-  if (trace_tail != trace_begin) {
-    if (trace_tail == trace_end) {
-      trace_tail = trace_begin;
-    } else {
-      trace_tail->first = opcode;
-      trace_tail->second = pc;
-      ++trace_tail;
-    }
-  }
-  prev_opcode = opcode;
-}
-
-void BrainFTraceRecorder::record(size_t pc, uint8_t opcode) {
-  if (executed) {
-    executed = false;
-    trace_tail = trace_begin;
-  }
-  
-  if (trace_tail != trace_begin) {
-    if (pc == trace_begin->second) {
-      commit();
-      trace_tail = trace_begin;
-    } else if (trace_tail == trace_end) {
-      trace_tail = trace_begin;
-    } else {
-      trace_tail->first = opcode;
-      trace_tail->second = pc;
-      ++trace_tail;
-    }
-  } else if (opcode == '[' && prev_opcode == ']'){
-    size_t hash = pc % ITERATION_BUF_SIZE;
-    if (iteration_count[hash] == 255) iteration_count[hash] = 254;
-    if (++iteration_count[hash] > COMPILE_THRESHOLD && trace_map.count(pc)) {
-      compile(trace_map[pc]);
-    } else if (++iteration_count[hash] > TRACE_THRESHOLD) {
-      trace_tail->first = opcode;
-      trace_tail->second = pc;
-      ++trace_tail;
-    }
-  }
-  
-  prev_opcode = opcode;
-}
\ No newline at end of file
diff --git a/examples/TracingBrainF/BrainFVM.h b/examples/TracingBrainF/BrainFVM.h
deleted file mode 100644
index 454df51837..0000000000
--- a/examples/TracingBrainF/BrainFVM.h
+++ /dev/null
@@ -1,63 +0,0 @@
-//===-- BrainFVM.h - BrainF interpreter header ----------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===--------------------------------------------------------------------===//
-
-#ifndef BRAINF_VM_H
-#define BRAINF_VM_H
-
-#include "BrainF.h"
-#include "stdint.h"
-#include <cstring>
-
-/// opcode_func_t - A function pointer signature for all opcode functions.
-typedef void(*opcode_func_t)(size_t pc, uint8_t* data);
-
-/// BytecodeArray - An array of function pointers representing the
-/// source program.  Indexed by PC address.
-extern opcode_func_t *BytecodeArray;
-
-/// JumpMap - An array of on-the-side data used by the interpreter.
-/// Indexed by PC address.
-extern size_t *JumpMap;
-
-/// executed - A flag indicating whether the preceding opcode was evaluated
-/// within a compiled trace execution.  Used by the trace recorder.
-extern uint8_t executed;
-
-/// Recorder - The trace recording engine.
-extern BrainFTraceRecorder *Recorder;
-
-/// op_plus - Implements the '+' instruction.
-void op_plus(size_t, uint8_t*);
-
-/// op_minus - Implements the '-' instruction.
-void op_minus(size_t, uint8_t*);
-
-// op_left - Implements the '<' instruction.
-void op_left(size_t, uint8_t*);
-
-// op_right - Implements the '>' instruction.
-void op_right(size_t, uint8_t*);
-
-// op_put - Implements the '.' instruction.
-void op_put(size_t, uint8_t*);
-
-// op_get - Implements the ',' instruction.
-void op_get(size_t, uint8_t*);
-
-// op_if - Implements the '[' instruction.
-void op_if(size_t, uint8_t*);
-
-// op_back - Implements the ']' instruction.
-void op_back(size_t, uint8_t*);
-
-// op_end - Terminates an execution.
-void op_end(size_t, uint8_t*);
-
-
-#endif
\ No newline at end of file
diff --git a/examples/TracingBrainF/Makefile b/examples/TracingBrainF/Makefile
deleted file mode 100644
index 54676f7f64..0000000000
--- a/examples/TracingBrainF/Makefile
+++ /dev/null
@@ -1,17 +0,0 @@
-##===- examples/TracingBrainF/Makefile ------------------- -*- Makefile -*-===##
-# 
-#                     The LLVM Compiler Infrastructure
-#
-# This file is distributed under the University of Illinois Open Source
-# License. See LICENSE.TXT for details.
-# 
-##===----------------------------------------------------------------------===##
-LEVEL = ../..
-TOOLNAME = TracingBrainF
-EXAMPLE_TOOL = 1
-
-CXXFLAGS += -foptimize-sibling-calls
-
-LINK_COMPONENTS := scalaropts jit nativecodegen
-
-include $(LEVEL)/Makefile.common
diff --git a/examples/TracingBrainF/README b/examples/TracingBrainF/README
deleted file mode 100644
index 11a6392127..0000000000
--- a/examples/TracingBrainF/README
+++ /dev/null
@@ -1 +0,0 @@
-This is an example trace-based JIT for Brainfuck, using LLVM as its code generation engine.  To compile it, simply drop this directory within llvm/examples in an LLVM source tree, and do `make` in that directory.