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/*
* Copyright 2014, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "Assert.h"
#include "Log.h"
#include "RSTransforms.h"
#include "RSUtils.h"
#include "rsDefines.h"
#include "bcc/Config.h"
#include "bcinfo/MetadataExtractor.h"
#include <cstdlib>
#include <llvm/IR/DataLayout.h>
#include <llvm/IR/DerivedTypes.h>
#include <llvm/IR/Function.h>
#include <llvm/IR/Instructions.h>
#include <llvm/IR/IRBuilder.h>
#include <llvm/IR/MDBuilder.h>
#include <llvm/IR/Module.h>
#include <llvm/IR/Type.h>
#include <llvm/Pass.h>
#include <llvm/Support/raw_ostream.h>
#include <llvm/Transforms/Utils/BasicBlockUtils.h>
using namespace bcc;
namespace {
class RSInvokeHelperPass : public llvm::FunctionPass {
private:
static char ID;
llvm::StructType* rsAllocationType;
llvm::StructType* rsElementType;
llvm::StructType* rsSamplerType;
llvm::StructType* rsScriptType;
llvm::StructType* rsTypeType;
llvm::Constant* rsAllocationSetObj;
llvm::Constant* rsElementSetObj;
llvm::Constant* rsSamplerSetObj;
llvm::Constant* rsScriptSetObj;
llvm::Constant* rsTypeSetObj;
public:
RSInvokeHelperPass()
: FunctionPass(ID) {
}
virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
// This pass does not use any other analysis passes, but it does
// modify the existing functions in the module (thus altering the CFG).
}
virtual bool doInitialization(llvm::Module &M) override {
llvm::FunctionType * SetObjType = nullptr;
llvm::SmallVector<llvm::Type*, 4> rsBaseObj;
rsBaseObj.append(4, llvm::Type::getInt64PtrTy(M.getContext()));
rsAllocationType = llvm::StructType::create(rsBaseObj, kAllocationTypeName);
rsElementType = llvm::StructType::create(rsBaseObj, kElementTypeName);
rsSamplerType = llvm::StructType::create(rsBaseObj, kSamplerTypeName);
rsScriptType = llvm::StructType::create(rsBaseObj, kScriptTypeName);
rsTypeType = llvm::StructType::create(rsBaseObj, kTypeTypeName);
llvm::SmallVector<llvm::Value*, 1> SetObjParams;
llvm::SmallVector<llvm::Type*, 2> SetObjTypeParams;
// get rsSetObject(rs_allocation*, rs_allocation*)
// according to AArch64 calling convention, these are both pointers because of the size of the struct
SetObjTypeParams.push_back(rsAllocationType->getPointerTo());
SetObjTypeParams.push_back(rsAllocationType->getPointerTo());
SetObjType = llvm::FunctionType::get(llvm::Type::getVoidTy(M.getContext()), SetObjTypeParams, false);
rsAllocationSetObj = M.getOrInsertFunction("_Z11rsSetObjectP13rs_allocationS_", SetObjType);
SetObjTypeParams.clear();
SetObjTypeParams.push_back(rsElementType->getPointerTo());
SetObjTypeParams.push_back(rsElementType->getPointerTo());
SetObjType = llvm::FunctionType::get(llvm::Type::getVoidTy(M.getContext()), SetObjTypeParams, false);
rsElementSetObj = M.getOrInsertFunction("_Z11rsSetObjectP10rs_elementS_", SetObjType);
SetObjTypeParams.clear();
SetObjTypeParams.push_back(rsSamplerType->getPointerTo());
SetObjTypeParams.push_back(rsSamplerType->getPointerTo());
SetObjType = llvm::FunctionType::get(llvm::Type::getVoidTy(M.getContext()), SetObjTypeParams, false);
rsSamplerSetObj = M.getOrInsertFunction("_Z11rsSetObjectP10rs_samplerS_", SetObjType);
SetObjTypeParams.clear();
SetObjTypeParams.push_back(rsScriptType->getPointerTo());
SetObjTypeParams.push_back(rsScriptType->getPointerTo());
SetObjType = llvm::FunctionType::get(llvm::Type::getVoidTy(M.getContext()), SetObjTypeParams, false);
rsScriptSetObj = M.getOrInsertFunction("_Z11rsSetObjectP9rs_scriptS_", SetObjType);
SetObjTypeParams.clear();
SetObjTypeParams.push_back(rsTypeType->getPointerTo());
SetObjTypeParams.push_back(rsTypeType->getPointerTo());
SetObjType = llvm::FunctionType::get(llvm::Type::getVoidTy(M.getContext()), SetObjTypeParams, false);
rsTypeSetObj = M.getOrInsertFunction("_Z11rsSetObjectP7rs_typeS_", SetObjType);
SetObjTypeParams.clear();
return true;
}
bool insertSetObjectHelper(llvm::CallInst *Call, llvm::Value *V, enum RsDataType DT) {
llvm::Constant *SetObj = nullptr;
llvm::StructType *RSStructType = nullptr;
switch (DT) {
case RS_TYPE_ALLOCATION:
SetObj = rsAllocationSetObj;
RSStructType = rsAllocationType;
break;
case RS_TYPE_ELEMENT:
SetObj = rsElementSetObj;
RSStructType = rsElementType;
break;
case RS_TYPE_SAMPLER:
SetObj = rsSamplerSetObj;
RSStructType = rsSamplerType;
break;
case RS_TYPE_SCRIPT:
SetObj = rsScriptSetObj;
RSStructType = rsScriptType;
break;
case RS_TYPE_TYPE:
SetObj = rsTypeSetObj;
RSStructType = rsTypeType;
break;
default:
return false; // this is for graphics types and matrices; do nothing
}
llvm::CastInst* CastedValue = llvm::CastInst::CreatePointerCast(V, RSStructType->getPointerTo(), "", Call);
llvm::SmallVector<llvm::Value*, 2> SetObjParams;
SetObjParams.push_back(CastedValue);
SetObjParams.push_back(CastedValue);
llvm::CallInst::Create(SetObj, SetObjParams, "", Call);
return true;
}
// this only modifies .helper functions that take certain RS base object types
virtual bool runOnFunction(llvm::Function &F) override {
if (!F.getName().startswith(".helper"))
return false;
bool changed = false;
const llvm::Function::ArgumentListType &argList(F.getArgumentList());
bool containsBaseObj = false;
// .helper methods should have one arg only, an anonymous struct
// that struct may contain BaseObjs
for (auto arg = argList.begin(); arg != argList.end(); arg++) {
llvm::Type *argType = arg->getType();
if (!argType->isPointerTy() || !argType->getPointerElementType()->isStructTy())
continue;
llvm::StructType *argStructType = llvm::dyn_cast<llvm::StructType>(argType->getPointerElementType());
for (unsigned int i = 0; i < argStructType->getNumElements(); i++) {
llvm::Type *currentType = argStructType->getElementType(i);
if (currentType->isStructTy() && currentType->getStructName().startswith("struct.rs_")) {
containsBaseObj = true;
}
}
break;
}
if (containsBaseObj) {
// modify the thing that should not be
auto &BBList(F.getBasicBlockList());
for (auto &BB : BBList) {
auto &InstList(BB.getInstList());
for (auto &Inst : InstList) {
// don't care about anything except call instructions that we didn't already add
if (llvm::CallInst *call = llvm::dyn_cast<llvm::CallInst>(&Inst)) {
for (unsigned int i = 0; i < call->getNumArgOperands(); i++) {
llvm::Value *V = call->getArgOperand(i);
llvm::Type *T = V->getType();
enum RsDataType DT = RS_TYPE_NONE;
if (T->isPointerTy() && T->getPointerElementType()->isStructTy()) {
DT = getRsDataTypeForType(T->getPointerElementType());
}
if (DT != RS_TYPE_NONE) {
// generate the new call instruction and insert it
changed |= insertSetObjectHelper(call, V, DT);
}
}
}
}
}
}
return changed;
}
virtual const char *getPassName() const override {
return ".helper method expansion for large RS objects";
}
}; // end RSInvokeHelperPass class
} // end anonymous namespace
char RSInvokeHelperPass::ID = 0;
namespace bcc {
llvm::FunctionPass *
createRSInvokeHelperPass(){
return new RSInvokeHelperPass();
}
}
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