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