109 lines
2.6 KiB
C++
109 lines
2.6 KiB
C++
/*
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* Copyright 2014, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Log.h"
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#include "RSTransforms.h"
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#include "RSFunctionsList.h"
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#include <cstdlib>
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#include <llvm/IR/Instructions.h>
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#include <llvm/IR/Module.h>
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#include <llvm/IR/Function.h>
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#include <llvm/Pass.h>
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namespace { // anonymous namespace
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// Create a Module pass that screens all the global functions in the
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// module and check if any disallowed external function is accessible
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// and potentially callable.
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class RSScreenFunctionsPass : public llvm::ModulePass {
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private:
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static char ID;
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bool isPresent(const std::string &name) {
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auto lower = std::lower_bound(stubList.begin(),
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stubList.end(),
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name);
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if (lower != stubList.end() && name.compare(*lower) == 0)
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return true;
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return false;
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}
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bool isLegal(llvm::Function &F) {
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// A global function symbol is legal if
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// a. it has a body, i.e. is not empty or
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// b. its name starts with "llvm." or
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// c. it is present in the RS Functions list.
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if (!F.empty())
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return true;
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llvm::StringRef FName = F.getName();
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if (FName.startswith("llvm."))
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return true;
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if (isPresent(FName.str()))
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return true;
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return false;
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}
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public:
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RSScreenFunctionsPass()
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: ModulePass (ID) {
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std::sort(stubList.begin(), stubList.end());
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}
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virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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}
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bool runOnModule(llvm::Module &M) override {
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bool failed = false;
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auto &FunctionList(M.getFunctionList());
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for(auto &F: FunctionList) {
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if (!isLegal(F)) {
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ALOGE("Call to function %s from RenderScript is disallowed\n",
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F.getName().str().c_str());
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failed = true;
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}
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}
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if (failed) {
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llvm::report_fatal_error("Use of undefined external function");
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}
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return false;
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}
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};
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}
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char RSScreenFunctionsPass::ID = 0;
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namespace bcc {
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llvm::ModulePass *
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createRSScreenFunctionsPass() {
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return new RSScreenFunctionsPass();
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}
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}
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