forked from OSchip/llvm-project
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
//===-- EmitFunctions.cpp - interface to insert instrumentation --*- C++ -*--=//
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//
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// This inserts a global constant table with function pointers all along
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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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namespace {
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struct EmitFunctionTable : public Pass {
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bool run(Module &M);
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};
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RegisterOpt<EmitFunctionTable> X("emitfuncs", "Emit a Function Table");
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}
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// Per Module pass for inserting function table
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bool EmitFunctionTable::run(Module &M){
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std::vector<const Type*> vType;
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std::vector<Constant *> vConsts;
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unsigned char 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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vConsts.push_back(ConstantPointerRef::get(MI));
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counter++;
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}
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StructType *sttype = StructType::get(vType);
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ConstantStruct *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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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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