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126 lines
3.7 KiB
C++
126 lines
3.7 KiB
C++
//===-- EmitFunctions.cpp - interface to insert instrumentation -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This inserts into the input module three new global constants containing
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// mapping information pertinent to the Reoptimizer's runtime library:
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// 1) a structure containing a pointer to each function;
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// 2) an array containing a boolean which is true iff the corresponding
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// function in 1) contains a back-edge branch suitable for the Reoptimizer's
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// first-level instrumentation;
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// 3) an integer containing the number of entries in 1) and 2).
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//
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// NOTE: This pass is used by the reoptimizer only.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Transforms/Instrumentation.h"
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using namespace llvm;
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namespace llvm {
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namespace {
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enum Color{
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WHITE,
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GREY,
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BLACK
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};
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struct EmitFunctionTable : public ModulePass {
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bool runOnModule(Module &M);
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};
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RegisterOpt<EmitFunctionTable>
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X("emitfuncs", "Emit a function table for the reoptimizer");
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}
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static char doDFS(BasicBlock * node,std::map<BasicBlock *, Color > &color){
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color[node] = GREY;
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for(succ_iterator vl = succ_begin(node), ve = succ_end(node); vl != ve; ++vl){
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BasicBlock *BB = *vl;
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if(color[BB]!=GREY && color[BB]!=BLACK){
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if(!doDFS(BB, color)){
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return 0;
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}
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}
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//if has backedge
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else if(color[BB]==GREY)
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return 0;
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}
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color[node] = BLACK;
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return 1;
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}
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static char hasBackEdge(Function *F){
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std::map<BasicBlock *, Color > color;
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return doDFS(F->begin(), color);
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}
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// Per Module pass for inserting function table
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bool EmitFunctionTable::runOnModule(Module &M){
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std::vector<const Type*> vType;
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std::vector<Constant *> vConsts;
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std::vector<Constant *> sBCons;
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unsigned int counter = 0;
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for(Module::iterator MI = M.begin(), ME = M.end(); MI != ME; ++MI)
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if (!MI->isExternal()) {
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vType.push_back(MI->getType());
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//std::cerr<<MI;
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vConsts.push_back(MI);
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sBCons.push_back(ConstantInt::get(Type::SByteTy, hasBackEdge(MI)));
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counter++;
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}
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StructType *sttype = StructType::get(vType);
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Constant *cstruct = ConstantStruct::get(sttype, vConsts);
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GlobalVariable *gb = new GlobalVariable(cstruct->getType(), true,
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GlobalValue::ExternalLinkage,
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cstruct, "llvmFunctionTable");
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M.getGlobalList().push_back(gb);
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Constant *constArray = ConstantArray::get(ArrayType::get(Type::SByteTy,
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sBCons.size()),
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sBCons);
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GlobalVariable *funcArray = new GlobalVariable(constArray->getType(), true,
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GlobalValue::ExternalLinkage,
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constArray, "llvmSimpleFunction");
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M.getGlobalList().push_back(funcArray);
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ConstantInt *cnst = ConstantSInt::get(Type::IntTy, counter);
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GlobalVariable *fnCount = new GlobalVariable(Type::IntTy, true,
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GlobalValue::ExternalLinkage,
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cnst, "llvmFunctionCount");
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M.getGlobalList().push_back(fnCount);
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return true; // Always modifies program
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}
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ModulePass *createEmitFunctionTablePass () {
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return new EmitFunctionTable();
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}
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} // end namespace llvm
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