94 lines
3.5 KiB
C++
94 lines
3.5 KiB
C++
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#include "ReplaceConstantMemory.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include <assert.h>
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#include <fstream>
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#include <iostream>
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#include <map>
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#include <set>
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using namespace llvm;
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void ReplaceConstantMemory(llvm::Module *M, std::ifstream &fin) {
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std::string s;
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bool find_constant_memory = false;
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while (getline(fin, s)) {
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if (s.find("ConstMemory2GlobalMemory") != std::string::npos) {
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find_constant_memory = true;
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break;
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}
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}
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if (!find_constant_memory) {
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assert(0 && "Do not find constant to global mapping\n");
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}
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std::map<std::string, std::string> corresponding_global_memory;
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while (getline(fin, s)) {
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if (s.find("END") != std::string::npos) {
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break;
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}
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// get constant name
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size_t pos = 0;
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pos = s.find(' ');
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std::string constant_name = s.substr(0, pos);
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s.erase(0, pos + 1);
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// get mapped global name
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std::string global_name = s.substr(3, s.length() - 1);
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corresponding_global_memory.insert(
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std::pair<std::string, std::string>(constant_name, global_name));
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}
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std::set<llvm::GlobalVariable *> need_remove_constant_memory;
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// find all constant memory and generate corresponding global memory
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for (auto I = M->global_begin(), E = M->global_end(); I != E; ++I) {
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if (auto constant_memory = dyn_cast<llvm::GlobalVariable>(I)) {
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if (corresponding_global_memory.find(constant_memory->getName().str()) !=
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corresponding_global_memory.end()) {
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auto global_name =
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corresponding_global_memory.find(constant_memory->getName().str())
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->second;
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// create a new global variable
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if (auto PT = dyn_cast<llvm::PointerType>(I->getType())) {
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need_remove_constant_memory.insert(constant_memory);
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// generate the corresponding global memory variable
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auto element_type = PT->getElementType();
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if (auto array_type = dyn_cast<llvm::ArrayType>(element_type)) {
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llvm::GlobalVariable *global_memory = new llvm::GlobalVariable(
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*M, array_type, false, llvm::GlobalValue::CommonLinkage, NULL,
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global_name, NULL, llvm::GlobalValue::NotThreadLocal, 0);
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llvm::ConstantAggregateZero *const_array =
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llvm::ConstantAggregateZero::get(array_type);
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global_memory->setInitializer(const_array);
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constant_memory->replaceAllUsesWith(
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llvm::ConstantExpr::getPointerCast(
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global_memory,
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cast<PointerType>(constant_memory->getType())));
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} else if (element_type->isStructTy()) {
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llvm::GlobalVariable *global_memory = new llvm::GlobalVariable(
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*M, element_type, false, llvm::GlobalValue::CommonLinkage, NULL,
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global_name, NULL, llvm::GlobalValue::NotThreadLocal, 0);
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llvm::ConstantAggregateZero *const_array =
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llvm::ConstantAggregateZero::get(element_type);
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global_memory->setInitializer(const_array);
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constant_memory->replaceAllUsesWith(
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llvm::ConstantExpr::getPointerCast(
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global_memory,
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cast<PointerType>(constant_memory->getType())));
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} else {
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assert(0 && "The required Constant Memory Type is not supported\n");
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}
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}
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}
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}
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}
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for (auto i : need_remove_constant_memory) {
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i->dropAllReferences();
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i->eraseFromParent();
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}
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return;
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}
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