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Set "jump dest" flag in constructor of BasicBlock

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This commit is contained in:
Paweł Bylica 2015-01-09 14:12:18 +01:00
parent f0008a3124
commit 6fee45a3e3
3 changed files with 13 additions and 13 deletions
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10
libevmjit/BasicBlock.cpp
View file

@ -20,19 +20,21 @@ namespace jit
const char* BasicBlock::NamePrefix = "Instr.";
BasicBlock::BasicBlock(bytes::const_iterator _begin, bytes::const_iterator _end, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder) :
BasicBlock::BasicBlock(bytes::const_iterator _begin, bytes::const_iterator _end, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder, bool isJumpDest) :
m_begin(_begin),
m_end(_end),
// TODO: Add begin index to name
m_llvmBB(llvm::BasicBlock::Create(_mainFunc->getContext(), NamePrefix, _mainFunc)),
m_stack(*this),
m_builder(_builder)
m_builder(_builder),
m_isJumpDest(isJumpDest)
{}
BasicBlock::BasicBlock(std::string _name, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder) :
BasicBlock::BasicBlock(std::string _name, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder, bool isJumpDest) :
m_llvmBB(llvm::BasicBlock::Create(_mainFunc->getContext(), _name, _mainFunc)),
m_stack(*this),
m_builder(_builder)
m_builder(_builder),
m_isJumpDest(isJumpDest)
{}
BasicBlock::LocalStack::LocalStack(BasicBlock& _owner) :

7
libevmjit/BasicBlock.h
View file

@ -53,8 +53,8 @@ public:
/// Basic block name prefix. The rest is instruction index.
static const char* NamePrefix;
explicit BasicBlock(bytes::const_iterator _begin, bytes::const_iterator _end, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder);
explicit BasicBlock(std::string _name, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder);
explicit BasicBlock(bytes::const_iterator _begin, bytes::const_iterator _end, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder, bool isJumpDest);
explicit BasicBlock(std::string _name, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder, bool isJumpDest);
BasicBlock(const BasicBlock&) = delete;
void operator=(const BasicBlock&) = delete;
@ -66,7 +66,6 @@ public:
bytes::const_iterator end() { return m_end; }
bool isJumpDest() const { return m_isJumpDest; }
void markAsJumpDest() { m_isJumpDest = true; }
LocalStack& localStack() { return m_stack; }
@ -113,7 +112,7 @@ private:
/// Is the basic block a valid jump destination.
/// JUMPDEST is the first instruction of the basic block.
bool m_isJumpDest = false;
bool const m_isJumpDest = false;
};
}

9
libevmjit/Compiler.cpp
View file

@ -83,9 +83,8 @@ void Compiler::createBasicBlocks(bytes const& _bytecode)
if (isEnd)
{
auto beginIdx = begin - _bytecode.begin();
auto p = m_basicBlocks.emplace(std::piecewise_construct, std::forward_as_tuple(beginIdx), std::forward_as_tuple(begin, next, m_mainFunc, m_builder));
if (nextJumpDest)
p.first->second.markAsJumpDest();
m_basicBlocks.emplace(std::piecewise_construct, std::forward_as_tuple(beginIdx),
std::forward_as_tuple(begin, next, m_mainFunc, m_builder, nextJumpDest));
nextJumpDest = false;
begin = next;
}
@ -98,7 +97,7 @@ llvm::BasicBlock* Compiler::getJumpTableBlock()
{
if (!m_jumpTableBlock)
{
m_jumpTableBlock.reset(new BasicBlock("JumpTable", m_mainFunc, m_builder));
m_jumpTableBlock.reset(new BasicBlock("JumpTable", m_mainFunc, m_builder, true));
InsertPointGuard g{m_builder};
m_builder.SetInsertPoint(m_jumpTableBlock->llvm());
auto dest = m_jumpTableBlock->localStack().pop();
@ -116,7 +115,7 @@ llvm::BasicBlock* Compiler::getBadJumpBlock()
{
if (!m_badJumpBlock)
{
m_badJumpBlock.reset(new BasicBlock("BadJump", m_mainFunc, m_builder));
m_badJumpBlock.reset(new BasicBlock("BadJump", m_mainFunc, m_builder, true));
InsertPointGuard g{m_builder};
m_builder.SetInsertPoint(m_badJumpBlock->llvm());
m_builder.CreateRet(Constant::get(ReturnCode::BadJumpDestination));