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Fix checking memory requirements with size 0

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This commit is contained in:
Paweł Bylica 2014-12-17 17:53:06 +01:00
parent a4927609d7
commit 0a642457f7
1 changed files with 6 additions and 0 deletions
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6
libevmjit/Memory.cpp
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@ -60,12 +60,18 @@ llvm::Function* Memory::createRequireFunc(GasMeter& _gasMeter, RuntimeManager& _
auto size = offset->getNextNode();
size->setName("size");
auto preBB = llvm::BasicBlock::Create(func->getContext(), "Pre", func);
auto checkBB = llvm::BasicBlock::Create(func->getContext(), "Check", func);
auto resizeBB = llvm::BasicBlock::Create(func->getContext(), "Resize", func);
auto returnBB = llvm::BasicBlock::Create(func->getContext(), "Return", func);
InsertPointGuard guard(m_builder); // Restores insert point at function exit
// BB "Pre": Ignore checks with size 0
m_builder.SetInsertPoint(preBB);
auto sizeIsZero = m_builder.CreateICmpEQ(size, Constant::get(0));
m_builder.CreateCondBr(sizeIsZero, returnBB, checkBB);
// BB "Check"
m_builder.SetInsertPoint(checkBB);
auto uaddWO = llvm::Intrinsic::getDeclaration(getModule(), llvm::Intrinsic::uadd_with_overflow, Type::Word);