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#pragma once
#include <libevmface/Instruction.h>
#include "CompilerHelper.h"
namespace dev
{
namespace eth
{
namespace jit
{
class RuntimeManager;
class GasMeter : public CompilerHelper // TODO: Use RuntimeHelper
{
public:
GasMeter(llvm::IRBuilder<>& _builder, RuntimeManager& _runtimeManager);
/// Count step cost of instruction
void count(Instruction _inst);
/// Calculate & count gas cost for SSTORE instruction
void countSStore(class Ext& _ext, llvm::Value* _index, llvm::Value* _newValue);
/// Finalize cost-block by checking gas needed for the block before the block
/// @param _additionalCost adds additional cost to cost-block before commit
void commitCostBlock(llvm::Value* _additionalCost = nullptr);
/// Give back an amount of gas not used by a call
void giveBack(llvm::Value* _gas);
/// Generate code that checks the cost of additional memory used by program
void checkMemory(llvm::Value* _additionalMemoryInWords, llvm::IRBuilder<>& _builder);
private:
/// Cumulative gas cost of a block of instructions
/// @TODO Handle overflow
uint64_t m_blockCost = 0;
llvm::CallInst* m_checkCall = nullptr;
llvm::Function* m_gasCheckFunc;
RuntimeManager& m_runtimeManager;
};
}
}
}