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/*========================== begin_copyright_notice ============================
Copyright (C) 2024 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "BufferBoundsCheckingPatcher.hpp"
#include "Compiler/IGCPassSupport.h"
#include "common/LLVMWarningsPush.hpp"
#include "llvmWrapper/IR/Function.h"
#include <llvm/IR/Function.h>
#include <llvm/IR/Instructions.h>
#include <llvm/IR/Module.h>
#include <llvm/Support/Regex.h>
#include <llvm/Transforms/Utils/BasicBlockUtils.h>
#include <llvm/Transforms/Utils/Cloning.h>
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
using namespace IGC;
// Register pass to igc-opt
#define PASS_FLAG "igc-buffer-bounds-checking-patcher"
#define PASS_DESCRIPTION "Buffer bounds checking - patcher"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(BufferBoundsCheckingPatcher, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
IGC_INITIALIZE_PASS_END(BufferBoundsCheckingPatcher, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
char BufferBoundsCheckingPatcher::ID = 0;
BufferBoundsCheckingPatcher::BufferBoundsCheckingPatcher() : ModulePass(ID) {
initializeBufferBoundsCheckingPatcherPass(*PassRegistry::getPassRegistry());
}
bool BufferBoundsCheckingPatcher::runOnModule(Module &M) {
metadataUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
for (auto &function : M) {
if (function.isDeclaration()) {
continue;
}
implicitArgs = new ImplicitArgs(function, metadataUtils);
if (!isEntryFunc(metadataUtils, &function)) {
return false;
}
for (auto &instruction : instructions(&function)) {
if (auto call = dyn_cast<CallInst>(&instruction)) {
auto function = call->getCalledFunction();
if (!function || function->getName() != BUFFER_SIZE_PLACEHOLDER_FUNCTION_NAME) {
continue;
}
auto bufferSize =
getBufferSizeArg(call->getFunction(), (uint32_t)cast<ConstantInt>(call->getArgOperand(0))->getSExtValue());
// auto bufferSize = ConstantInt::get(Type::getInt64Ty(call->getContext()), 64); // Only for testing purposes
call->replaceAllUsesWith(bufferSize);
toRemove.push_back(call);
}
}
}
for (const auto &it : toRemove) {
it->eraseFromParent();
}
auto bufferSizePlaceholderFunction = M.getFunction(BUFFER_SIZE_PLACEHOLDER_FUNCTION_NAME);
if (bufferSizePlaceholderFunction) {
bufferSizePlaceholderFunction->eraseFromParent();
return true;
}
return !toRemove.empty();
}
Argument *BufferBoundsCheckingPatcher::getBufferSizeArg(Function *function, uint32_t n) {
uint32_t index = implicitArgs->getNumberedArgIndex(ImplicitArg::ArgType::BUFFER_SIZE, n);
if (index >= implicitArgs->size()) {
IGC_ASSERT_MESSAGE(0, "Implicit argument for BUFFER_SIZE is out of range!");
return nullptr;
}
return IGCLLVM::getArg(*function, function->arg_size() - implicitArgs->size() + index);
}
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