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Merge pull request #8179 from pinkiebell/codegen

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libsolidity/codegen: Use calldatacopy to cheaply zero memory..
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chriseth 2020-01-28 18:07:30 +01:00 committed by GitHub
commit 35820398c2
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2 changed files with 2 additions and 2 deletions
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2
libsolidity/codegen/CompilerUtils.cpp
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@ -605,7 +605,7 @@ void CompilerUtils::zeroInitialiseMemoryArray(ArrayType const& _type)
Whiskers templ(R"({
let size := mul(length, <element_size>)
// cheap way of zero-initializing a memory range
codecopy(memptr, codesize(), size)
calldatacopy(memptr, calldatasize(), size)
memptr := add(memptr, size)
})");
templ("element_size", to_string(_type.memoryStride()));

2
test/libsolidity/SolidityEndToEndTest.cpp
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@ -10131,7 +10131,7 @@ BOOST_AUTO_TEST_CASE(create_dynamic_array_with_zero_length)
BOOST_AUTO_TEST_CASE(correctly_initialize_memory_array_in_constructor)
{
// Memory arrays are initialized using codecopy past the size of the code.
// Memory arrays are initialized using calldatacopy past the size of the calldata.
// This test checks that it also works in the constructor context.
char const* sourceCode = R"(
contract C {