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https://github.com/ethereum/solidity
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Merge pull request #4501 from ethereum/recursiveStructsWithFixedArrays
Consider fixed-size arrays when checking for recursive structs.
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commit
bab4a3975f
@ -65,6 +65,7 @@ Bugfixes:
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* Tests: Fix chain parameters to make ipc tests work with newer versions of cpp-ethereum.
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* Code Generator: Fix allocation of byte arrays (zeroed out too much memory).
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* Fix NatSpec json output for `@notice` and `@dev` tags on contract definitions.
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* Type Checker: Consider fixed size arrays when checking for recursive structs.
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* Type System: Allow arbitrary exponents for literals with a mantissa of zero.
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### 0.4.24 (2018-05-16)
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@ -30,6 +30,7 @@
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#include <libsolidity/inlineasm/AsmAnalysisInfo.h>
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#include <libsolidity/inlineasm/AsmData.h>
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#include <libsolidity/interface/ErrorReporter.h>
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#include <libdevcore/Algorithms.h>
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using namespace std;
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using namespace dev;
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@ -593,22 +594,24 @@ bool TypeChecker::visit(StructDefinition const& _struct)
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m_errorReporter.typeError(member->location(), "Type cannot be used in struct.");
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// Check recursion, fatal error if detected.
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using StructPointer = StructDefinition const*;
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using StructPointersSet = set<StructPointer>;
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function<void(StructPointer,StructPointersSet const&)> check = [&](StructPointer _struct, StructPointersSet const& _parents)
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auto visitor = [&](StructDefinition const& _struct, CycleDetector<StructDefinition>& _cycleDetector)
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{
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if (_parents.count(_struct))
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m_errorReporter.fatalTypeError(_struct->location(), "Recursive struct definition.");
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StructPointersSet parents = _parents;
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parents.insert(_struct);
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for (ASTPointer<VariableDeclaration> const& member: _struct->members())
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if (type(*member)->category() == Type::Category::Struct)
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for (ASTPointer<VariableDeclaration> const& member: _struct.members())
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{
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Type const* memberType = type(*member).get();
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while (auto arrayType = dynamic_cast<ArrayType const*>(memberType))
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{
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auto const& typeName = dynamic_cast<UserDefinedTypeName const&>(*member->typeName());
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check(&dynamic_cast<StructDefinition const&>(*typeName.annotation().referencedDeclaration), parents);
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if (arrayType->isDynamicallySized())
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break;
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memberType = arrayType->baseType().get();
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}
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if (auto structType = dynamic_cast<StructType const*>(memberType))
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if (_cycleDetector.run(structType->structDefinition()))
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return;
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}
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};
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check(&_struct, StructPointersSet{});
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if (CycleDetector<StructDefinition>(visitor).run(_struct) != nullptr)
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m_errorReporter.fatalTypeError(_struct.location(), "Recursive struct definition.");
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ASTNode::listAccept(_struct.members(), *this);
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@ -0,0 +1,7 @@
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contract Test {
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struct MyStructName {
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address addr;
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MyStructName[] x;
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}
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}
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// ----
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@ -0,0 +1,8 @@
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contract Test {
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struct MyStructName {
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address addr;
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MyStructName[1] x;
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}
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}
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// ----
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// TypeError: (20-96): Recursive struct definition.
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@ -0,0 +1,18 @@
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contract Test {
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struct MyStructName1 {
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address addr;
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uint256 count;
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MyStructName4[1] x;
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}
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struct MyStructName2 {
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MyStructName1 x;
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}
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struct MyStructName3 {
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MyStructName2[1] x;
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}
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struct MyStructName4 {
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MyStructName3 x;
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}
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}
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// ----
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// TypeError: (20-121): Recursive struct definition.
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@ -0,0 +1,11 @@
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contract Test {
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struct MyStructName1 {
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address addr;
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uint256 count;
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MyStructName2[] x;
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}
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struct MyStructName2 {
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MyStructName1 x;
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}
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}
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// ----
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@ -0,0 +1,11 @@
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contract Test {
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struct MyStructName1 {
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address addr;
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uint256 count;
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MyStructName2 x;
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}
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struct MyStructName2 {
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MyStructName1[] x;
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}
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}
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// ----
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@ -0,0 +1,11 @@
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contract Test {
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struct MyStructName1 {
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address addr;
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uint256 count;
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MyStructName2[] x;
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}
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struct MyStructName2 {
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MyStructName1[] x;
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}
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}
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// ----
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@ -0,0 +1,21 @@
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contract Test {
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struct S1 {
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S2[1][] x;
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}
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struct S2 {
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S1 x;
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}
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struct T1 {
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T2[][1] x;
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}
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struct T2 {
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T1 x;
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}
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struct R1 {
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R2[][] x;
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}
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struct R2 {
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R1 x;
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}
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}
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// ----
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@ -0,0 +1,12 @@
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contract Test {
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struct MyStructName1 {
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address addr;
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uint256 count;
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MyStructName2[1] x;
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}
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struct MyStructName2 {
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MyStructName1 x;
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}
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}
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// ----
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// TypeError: (20-121): Recursive struct definition.
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@ -0,0 +1,12 @@
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contract Test {
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struct MyStructName1 {
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address addr;
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uint256 count;
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MyStructName2 x;
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}
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struct MyStructName2 {
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MyStructName1[1] x;
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}
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}
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// ----
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// TypeError: (20-118): Recursive struct definition.
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@ -0,0 +1,12 @@
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contract Test {
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struct MyStructName1 {
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address addr;
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uint256 count;
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MyStructName2[1] x;
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}
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struct MyStructName2 {
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MyStructName1[1] x;
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}
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}
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// ----
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// TypeError: (20-121): Recursive struct definition.
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@ -0,0 +1,12 @@
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contract Test {
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struct MyStructName1 {
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address addr;
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uint256 count;
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MyStructName2[1][1] x;
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}
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struct MyStructName2 {
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MyStructName1 x;
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}
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}
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// ----
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// TypeError: (20-124): Recursive struct definition.
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@ -0,0 +1,4 @@
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contract Test {
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struct S1 { uint a; }
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struct S2 { S1[1] x; S1[1] y; }
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}
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