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SHA3 gas cost updated

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This commit is contained in:
Paweł Bylica 2014-12-16 20:14:47 +01:00
parent 76d30b8f9f
commit 49bd78b404
3 changed files with 21 additions and 2 deletions
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1
libevmjit/Compiler.cpp
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@ -504,6 +504,7 @@ void Compiler::compileBasicBlock(BasicBlock& _basicBlock, bytes const& _bytecode
auto inOff = stack.pop();
auto inSize = stack.pop();
_memory.require(inOff, inSize);
_gasMeter.countSha3Data(inSize);
auto hash = _ext.sha3(inOff, inSize);
stack.push(hash);
break;

19
libevmjit/GasMeter.cpp
View file

@ -21,12 +21,14 @@ namespace // Helper functions
uint64_t const c_stepGas = 1;
uint64_t const c_balanceGas = 20;
uint64_t const c_sha3Gas = 20;
uint64_t const c_sha3Gas = 10;
uint64_t const c_sha3WordGas = 10;
uint64_t const c_sloadGas = 20;
uint64_t const c_sstoreSetGas = 300;
uint64_t const c_sstoreResetGas = 100;
uint64_t const c_sstoreRefundGas = 100;
uint64_t const c_createGas = 100;
uint64_t const c_createDataGas = 5;
uint64_t const c_callGas = 20;
uint64_t const c_expGas = 1;
uint64_t const c_expByteGas = 1;
@ -44,7 +46,7 @@ uint64_t getStepCost(Instruction inst) // TODO: Add this function to FeeSructure
switch (inst)
{
default: // Assumes instruction code is valid
return 1;
return c_stepGas;
case Instruction::STOP:
case Instruction::SUICIDE:
@ -190,6 +192,19 @@ void GasMeter::countLogData(llvm::Value* _dataLength)
commitCostBlock(_dataLength); // TODO: commit is not necessary
}
void GasMeter::countSha3Data(llvm::Value* _dataLength)
{
assert(m_checkCall);
assert(m_blockCost > 0); // SHA3 instruction is already counted
// TODO: This round ups to 32 happens in many places
// FIXME: Overflow possible but Memory::require() also called. Probably 64-bit arith can be used.
static_assert(c_sha3WordGas != 1, "SHA3 data cost has changed. Update GasMeter");
auto words = m_builder.CreateUDiv(m_builder.CreateAdd(_dataLength, Constant::get(31)), Constant::get(32));
auto cost = m_builder.CreateNUWMul(Constant::get(c_sha3WordGas), words);
count(cost);
}
void GasMeter::giveBack(llvm::Value* _gas)
{
m_runtimeManager.setGas(m_builder.CreateAdd(m_runtimeManager.getGas(), _gas));

3
libevmjit/GasMeter.h
View file

@ -32,6 +32,9 @@ public:
/// Count gas cost of LOG data
void countLogData(llvm::Value* _dataLength);
/// Count gas cost of SHA3 data
void countSha3Data(llvm::Value* _dataLength);
/// 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);