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Merge pull request #10366 from ethereum/wasm-string-literal

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[wasm] Document what StringLiteral is
This commit is contained in:
Harikrishnan Mulackal 2020-11-23 10:20:46 +01:00 committed by GitHub
commit 1dd0cd1245
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3 changed files with 6 additions and 2 deletions
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5
libyul/backends/wasm/BinaryTransform.cpp
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@ -345,8 +345,9 @@ bytes BinaryTransform::operator()(Literal const& _literal)
bytes BinaryTransform::operator()(StringLiteral const&)
{
// TODO is this used?
yulAssert(false, "String literals not yet implemented");
// StringLiteral is a special AST element used for certain builtins.
// It is not mapped to actual WebAssembly, and should be processed in visit(BuiltinCall).
yulAssert(false, "");
}
bytes BinaryTransform::operator()(LocalVariable const& _variable)

2
libyul/backends/wasm/TextTransform.cpp
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@ -101,6 +101,8 @@ string TextTransform::operator()(wasm::Literal const& _literal)
string TextTransform::operator()(wasm::StringLiteral const& _literal)
{
// StringLiteral is a special AST element used for certain builtins.
// The output of this will not be valid WebAssembly.
string quoted = boost::replace_all_copy(_literal.value, "\\", "\\\\");
boost::replace_all(quoted, "\"", "\\\"");
return "\"" + quoted + "\"";

1
libyul/backends/wasm/WasmAST.h
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@ -63,6 +63,7 @@ using Expression = std::variant<
>;
struct Literal { std::variant<uint32_t, uint64_t> value; };
// This is a special AST element used for certain builtins. It is not mapped to actual WebAssembly.
struct StringLiteral { std::string value; };
struct LocalVariable { std::string name; };
struct GlobalVariable { std::string name; };