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16ecb3e79f
This adds functionality to load plugins such as the AFL llvm-mode plugin: https://github.com/mirrorer/afl/blob/master/llvm_mode/afl-llvm-pass.so.cc Note that such plugins developed for Clang should also work for LDC !
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
//===-- addFuncEntryCallPass.cpp - Optimize druntime calls ----------------===//
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//
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// LDC – the LLVM D compiler
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See the LICENSE file for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Pass.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Transforms/IPO/PassManagerBuilder.h"
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using namespace llvm;
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namespace {
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class FuncEntryCallPass : public FunctionPass {
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Constant *funcToCallUponEntry = nullptr;
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public:
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static char ID;
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FuncEntryCallPass() : FunctionPass(ID) {}
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bool doInitialization(Module &M) override;
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bool runOnFunction(Function &F) override;
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};
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}
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char FuncEntryCallPass::ID = 0;
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bool FuncEntryCallPass::doInitialization(Module &M) {
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// Add fwd declaration of the `void __test_funcentrycall(void)` function.
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auto functionType = FunctionType::get(Type::getVoidTy(M.getContext()), false);
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funcToCallUponEntry =
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M.getOrInsertFunction("__test_funcentrycall", functionType);
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return true;
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}
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bool FuncEntryCallPass::runOnFunction(Function &F) {
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// Add call to `__test_funcentrycall(void)` at the start of _every_ function
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// (this includes e.g. `ldc.register_dso`!)
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llvm::BasicBlock &block = F.getEntryBlock();
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IRBuilder<> builder(&block, block.begin());
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builder.CreateCall(funcToCallUponEntry);
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return true;
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}
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static void addFuncEntryCallPass(const PassManagerBuilder &,
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legacy::PassManagerBase &PM) {
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PM.add(new FuncEntryCallPass());
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}
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// Registration of the plugin's pass is done by the plugin's static constructor.
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static RegisterStandardPasses
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RegisterFuncEntryCallPass0(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addFuncEntryCallPass);
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