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Allocate one byte per memory byte array element instead of 32.

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This commit is contained in:
chriseth
2017-10-16 22:29:31 +02:00
parent 7989fc4c35
commit 6001bd1406
3 changed files with 34 additions and 2 deletions
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libsolidity/codegen/ExpressionCompiler.cpp
+9 -2
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@@ -858,8 +858,15 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
m_context << Instruction::DUP1 << Instruction::DUP3 << Instruction::MSTORE;
// Stack: memptr requested_length
// update free memory pointer
m_context << Instruction::DUP1 << arrayType.baseType()->memoryHeadSize();
m_context << Instruction::MUL << u256(32) << Instruction::ADD;
m_context << Instruction::DUP1;
// Stack: memptr requested_length requested_length
if (arrayType.isByteArray())
// Round up to multiple of 32
m_context << u256(31) << Instruction::ADD << u256(31) << Instruction::NOT << Instruction::AND;
else
m_context << arrayType.baseType()->memoryHeadSize() << Instruction::MUL;
// stacK: memptr requested_length data_size
m_context << u256(32) << Instruction::ADD;
m_context << Instruction::DUP3 << Instruction::ADD;
utils().storeFreeMemoryPointer();
// Stack: memptr requested_length