Introducing GasMeter

evmcc/Compiler.cpp

@@ -12,6 +12,9 @@
 namespace evmcc
 {
 
+using dev::eth::Instruction;
+using namespace dev::eth; // We should move all the JIT code into dev::eth namespace
+
 struct
 {
 	llvm::Type* word8;
@@ -191,7 +194,6 @@ std::unique_ptr<llvm::Module> Compiler::compile(const dev::bytes& bytecode)
 
 		for (auto currentPC = basicBlock.begin(); currentPC != basicBlock.end(); ++currentPC)
 		{
-			using dev::eth::Instruction;
 			auto inst = static_cast<Instruction>(bytecode[currentPC]);
 			switch (inst)
 			{

evmcc/GasMeter.cpp

@@ -0,0 +1,49 @@
+
+#include "GasMeter.h"
+
+#include <libevmface/Instruction.h>
+#include <libevm/FeeStructure.h>
+
+namespace evmcc
+{
+
+using namespace dev::eth; // We should move all the JIT code into dev::eth namespace
+
+namespace
+{
+
+uint64_t getStepCost(dev::eth::Instruction inst) // TODO: Add this function to FeeSructure
+{
+	switch (inst)
+	{
+	case Instruction::STOP:
+	case Instruction::SUICIDE:
+		return 0;
+
+	case Instruction::SSTORE:
+		return static_cast<uint64_t>(c_sstoreGas);
+
+	case Instruction::SLOAD:
+		return static_cast<uint64_t>(c_sloadGas);
+
+	case Instruction::SHA3:
+		return static_cast<uint64_t>(c_sha3Gas);
+
+	case Instruction::BALANCE:
+		return static_cast<uint64_t>(c_sha3Gas);
+
+	case Instruction::CALL:
+	case Instruction::CALLCODE:
+		return static_cast<uint64_t>(c_callGas);
+
+	case Instruction::CREATE:
+		return static_cast<uint64_t>(c_createGas);
+
+	default: // Assumes instruction code is valid
+		return static_cast<uint64_t>(c_stepGas);;
+	}
+}
+
+}
+
+}

evmcc/GasMeter.h

@@ -0,0 +1,9 @@
+
+#pragma once
+
+#include <libevmface/Instruction.h>
+
+namespace evmcc
+{
+
+}