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[ewasm] Fix infinite loops.

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This commit is contained in:
Alexander Arlt 2020-06-16 21:23:26 -05:00 committed by chriseth
parent e419e904d3
commit 86be0fbc2f
2 changed files with 5 additions and 2 deletions
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1
Changelog.md
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@ -12,6 +12,7 @@ Bugfixes:
* NatSpec: Do not consider ``////`` and ``/***`` as NatSpec comments.
* Type Checker: Fix internal error related to ``using for`` applied to non-libraries.
* Type Checker: Do not disallow assigning to calldata variables.
* Wasm backend: Fix code generation for for-loops with pre statements.
* Yul: Fix source location of variable multi-assignment.

6
libyul/backends/wasm/WasmCodeTransform.cpp
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@ -257,9 +257,10 @@ wasm::Expression WasmCodeTransform::operator()(ForLoop const& _for)
YulString eqz_instruction = YulString(conditionType.str() + ".eqz");
yulAssert(WasmDialect::instance().builtin(eqz_instruction), "");
std::vector<wasm::Expression> statements = visit(_for.pre.statements);
wasm::Loop loop;
loop.labelName = newLabel();
loop.statements = visit(_for.pre.statements);
loop.statements.emplace_back(wasm::BranchIf{wasm::Label{breakLabel}, make_unique<wasm::Expression>(
wasm::BuiltinCall{eqz_instruction.str(), make_vector<wasm::Expression>(
visitReturnByValue(*_for.condition)
@ -269,7 +270,8 @@ wasm::Expression WasmCodeTransform::operator()(ForLoop const& _for)
loop.statements += visit(_for.post.statements);
loop.statements.emplace_back(wasm::Branch{wasm::Label{loop.labelName}});
return { wasm::Block{breakLabel, make_vector<wasm::Expression>(move(loop))} };
statements += make_vector<wasm::Expression>(move(loop));
return wasm::Block{breakLabel, move(statements)};
}
wasm::Expression WasmCodeTransform::operator()(Break const&)