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| author | chriseth <chris@ethereum.org> | 2016-08-17 22:44:15 +0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2016-08-17 22:44:15 +0800 |
| commit | b2507e9f105ab701c417f8f2d125edf8f3022698 (patch) | |
| tree | e67c6047c68d8e89e218fcb5dec1ef394aa4b828 /libsolidity | |
| parent | d6579a0a5f99425eae95329b77e07ea072122924 (diff) | |
| parent | 774bb8ab3baa9d7b5e6368dcd0f887b13ff26ae8 (diff) | |
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Merge pull request #839 from chriseth/checkcode
BREAKING: Make function calls throw if target does not have code.
Diffstat (limited to 'libsolidity')
| -rw-r--r-- | libsolidity/codegen/ExpressionCompiler.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libsolidity/codegen/ExpressionCompiler.cpp b/libsolidity/codegen/ExpressionCompiler.cpp index 4695ff96..4a81e27d 100644 --- a/libsolidity/codegen/ExpressionCompiler.cpp +++ b/libsolidity/codegen/ExpressionCompiler.cpp @@ -1524,6 +1524,13 @@ void ExpressionCompiler::appendExternalFunctionCall( m_context << u256(0); m_context << dupInstruction(m_context.baseToCurrentStackOffset(contractStackPos)); + // Check the the target contract exists (has code) for non-low-level calls. + if (funKind == FunctionKind::External || funKind == FunctionKind::CallCode || funKind == FunctionKind::DelegateCall) + { + m_context << Instruction::DUP1 << Instruction::EXTCODESIZE << Instruction::ISZERO; + m_context.appendConditionalJumpTo(m_context.errorTag()); + } + if (_functionType.gasSet()) m_context << dupInstruction(m_context.baseToCurrentStackOffset(gasStackPos)); else |