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Use STATICCALL for pure function calls if EVM version supports it and 0.5.0 is activated.

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This commit is contained in:
chriseth 2017-09-26 15:27:03 +02:00 committed by Alex Beregszaszi
parent 0df4c64884
commit b467116ea8
3 changed files with 13 additions and 3 deletions
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3
Changelog.md
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@ -2,8 +2,9 @@
Features:
* C99/C++-style scoping rules (instead of JavaScript function scoping) take effect as experimental v0.5.0 feature.
* Code Generator: Assert that ``k != 0`` for ``molmod(a, b, k)`` and ``addmod(a, b, k)`` as experimental 0.5.0 feature.
* Code Generator: Assert that ``k != 0`` for ``mulmod(a, b, k)`` and ``addmod(a, b, k)`` as experimental 0.5.0 feature.
* Code Generator: Do not retain any gas in calls (except if EVM version is set to homestead).
* Code Generator: Use ``STATICCALL`` opcode for calling ``view`` and ``pure`` functions as experimenal 0.5.0 feature.
* Interface: Provide ability to select target EVM version (homestead or byzantium, with byzantium being the default).
* Standard JSON: Reject badly formatted invalid JSON inputs.
* Type Checker: Disallow uninitialized storage pointers as experimental 0.5.0 feature.

4
libsolidity/ast/ExperimentalFeatures.h
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@ -29,8 +29,8 @@ namespace solidity
enum class ExperimentalFeature
{
SMTChecker,
ABIEncoderV2, // new ABI encoder that makes use of JULIA
SMTChecker,
V050, // v0.5.0 breaking changes
Test,
TestOnlyAnalysis
@ -45,8 +45,8 @@ static const std::map<ExperimentalFeature, bool> ExperimentalFeatureOnlyAnalysis
static const std::map<std::string, ExperimentalFeature> ExperimentalFeatureNames =
{
{ "SMTChecker", ExperimentalFeature::SMTChecker },
{ "ABIEncoderV2", ExperimentalFeature::ABIEncoderV2 },
{ "SMTChecker", ExperimentalFeature::SMTChecker },
{ "v0.5.0", ExperimentalFeature::V050 },
{ "__test", ExperimentalFeature::Test },
{ "__testOnlyAnalysis", ExperimentalFeature::TestOnlyAnalysis },

9
libsolidity/codegen/ExpressionCompiler.cpp
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@ -1610,6 +1610,10 @@ void ExpressionCompiler::appendExternalFunctionCall(
bool returnSuccessCondition = funKind == FunctionType::Kind::BareCall || funKind == FunctionType::Kind::BareCallCode || funKind == FunctionType::Kind::BareDelegateCall;
bool isCallCode = funKind == FunctionType::Kind::BareCallCode || funKind == FunctionType::Kind::CallCode;
bool isDelegateCall = funKind == FunctionType::Kind::BareDelegateCall || funKind == FunctionType::Kind::DelegateCall;
bool useStaticCall =
_functionType.stateMutability() <= StateMutability::View &&
m_context.experimentalFeatureActive(ExperimentalFeature::V050) &&
m_context.evmVersion().hasStaticCall();
unsigned retSize = 0;
if (returnSuccessCondition)
@ -1738,6 +1742,8 @@ void ExpressionCompiler::appendExternalFunctionCall(
// [value,] addr, gas (stack top)
if (isDelegateCall)
solAssert(!_functionType.valueSet(), "Value set for delegatecall");
else if (useStaticCall)
solAssert(!_functionType.valueSet(), "Value set for staticcall");
else if (_functionType.valueSet())
m_context << dupInstruction(m_context.baseToCurrentStackOffset(valueStackPos));
else
@ -1769,10 +1775,13 @@ void ExpressionCompiler::appendExternalFunctionCall(
gasNeededByCaller += eth::GasCosts::callNewAccountGas; // we never know
m_context << gasNeededByCaller << Instruction::GAS << Instruction::SUB;
}
// Order is important here, STATICCALL might overlap with DELEGATECALL.
if (isDelegateCall)
m_context << Instruction::DELEGATECALL;
else if (isCallCode)
m_context << Instruction::CALLCODE;
else if (useStaticCall)
m_context << Instruction::STATICCALL;
else
m_context << Instruction::CALL;