You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
3.8 KiB
126 lines
3.8 KiB
#pragma once
|
|
|
|
#include <vector>
|
|
|
|
#include "Common.h"
|
|
#include "Stack.h"
|
|
|
|
namespace dev
|
|
{
|
|
namespace eth
|
|
{
|
|
namespace jit
|
|
{
|
|
|
|
using instr_idx = uint64_t;
|
|
|
|
class BasicBlock
|
|
{
|
|
public:
|
|
class LocalStack
|
|
{
|
|
public:
|
|
/// Pushes value on stack
|
|
void push(llvm::Value* _value);
|
|
|
|
/// Pops and returns top value
|
|
llvm::Value* pop();
|
|
|
|
/// Duplicates _index'th value on stack
|
|
void dup(size_t _index);
|
|
|
|
/// Swaps _index'th value on stack with a value on stack top.
|
|
/// @param _index Index of value to be swaped. Must be > 0.
|
|
void swap(size_t _index);
|
|
|
|
private:
|
|
LocalStack(BasicBlock& _owner);
|
|
LocalStack(LocalStack const&) = delete;
|
|
void operator=(LocalStack const&) = delete;
|
|
friend BasicBlock;
|
|
|
|
/// Gets _index'th value from top (counting from 0)
|
|
llvm::Value* get(size_t _index);
|
|
|
|
/// Sets _index'th value from top (counting from 0)
|
|
void set(size_t _index, llvm::Value* _value);
|
|
|
|
std::vector<llvm::Value*>::iterator getItemIterator(size_t _index);
|
|
|
|
private:
|
|
BasicBlock& m_bblock;
|
|
};
|
|
|
|
explicit BasicBlock(instr_idx _firstInstrIdx, code_iterator _begin, code_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;
|
|
BasicBlock& operator=(const BasicBlock&) = delete;
|
|
|
|
llvm::BasicBlock* llvm() { return m_llvmBB; }
|
|
|
|
instr_idx firstInstrIdx() const { return m_firstInstrIdx; }
|
|
code_iterator begin() const { return m_begin; }
|
|
code_iterator end() const { return m_end; }
|
|
|
|
bool isJumpDest() const { return m_isJumpDest; }
|
|
|
|
llvm::Value* getJumpTarget() const { return m_jumpTarget; }
|
|
void setJumpTarget(llvm::Value* _jumpTarget) { m_jumpTarget = _jumpTarget; }
|
|
|
|
LocalStack& localStack() { return m_stack; }
|
|
|
|
/// Optimization: propagates values between local stacks in basic blocks
|
|
/// to avoid excessive pushing/popping on the EVM stack.
|
|
static void linkLocalStacks(std::vector<BasicBlock*> _basicBlocks, llvm::IRBuilder<>& _builder);
|
|
|
|
/// Synchronize current local stack with the EVM stack.
|
|
void synchronizeLocalStack(Stack& _evmStack);
|
|
|
|
/// Prints local stack and block instructions to stderr.
|
|
/// Useful for calling in a debugger session.
|
|
void dump();
|
|
void dump(std::ostream& os, bool _dotOutput = false);
|
|
|
|
private:
|
|
instr_idx const m_firstInstrIdx = 0; ///< Code index of first instruction in the block
|
|
code_iterator const m_begin = {}; ///< Iterator pointing code beginning of the block
|
|
code_iterator const m_end = {}; ///< Iterator pointing code end of the block
|
|
|
|
llvm::BasicBlock* const m_llvmBB;
|
|
|
|
/// Basic black state vector (stack) - current/end values and their positions on stack
|
|
/// @internal Must be AFTER m_llvmBB
|
|
LocalStack m_stack;
|
|
|
|
llvm::IRBuilder<>& m_builder;
|
|
|
|
/// This stack contains LLVM values that correspond to items found at
|
|
/// the EVM stack when the current basic block starts executing.
|
|
/// Location 0 corresponds to the top of the EVM stack, location 1 is
|
|
/// the item below the top and so on. The stack grows as the code
|
|
/// accesses more items on the EVM stack but once a value is put on
|
|
/// the stack, it will never be replaced.
|
|
std::vector<llvm::Value*> m_initialStack;
|
|
|
|
/// This stack tracks the contents of the EVM stack as the basic block
|
|
/// executes. It may grow on both sides, as the code pushes items on
|
|
/// top of the stack or changes existing items.
|
|
std::vector<llvm::Value*> m_currentStack;
|
|
|
|
/// How many items higher is the current stack than the initial one.
|
|
/// May be negative.
|
|
int m_tosOffset = 0;
|
|
|
|
/// Is the basic block a valid jump destination.
|
|
/// JUMPDEST is the first instruction of the basic block.
|
|
bool const m_isJumpDest = false;
|
|
|
|
/// If block finishes with dynamic jump target index is stored here
|
|
llvm::Value* m_jumpTarget = nullptr;
|
|
};
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
|