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C++: Add test showing that the IR translation for typeid is broken #20058

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Jul 15, 2025
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C++: Add test showing that the IR translation for typeid is broken #20058

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39 changes: 39 additions & 0 deletions cpp/ql/test/library-tests/ir/ir/PrintAST.expected
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Expand Up @@ -50174,3 +50174,42 @@ try_except.cpp:
# 52| Type = [IntType] int
# 52| ValueCategory = prvalue(load)
# 54| getStmt(2): [ReturnStmt] return ...
type_info_test.cpp:
# 3| [TopLevelFunction] void type_info_test(int)
# 3| <params>:
# 3| getParameter(0): [Parameter] x
# 3| Type = [IntType] int
# 3| getEntryPoint(): [BlockStmt] { ... }
# 4| getStmt(0): [DeclStmt] declaration
# 4| getDeclarationEntry(0): [VariableDeclarationEntry] definition of t1
# 4| Type = [LValueReferenceType] const type_info &
# 4| getVariable().getInitializer(): [Initializer] initializer for t1
# 4| getExpr(): [TypeidOperator] typeid ...
# 4| Type = [SpecifiedType] const type_info
# 4| ValueCategory = lvalue
# 4| getExpr(): [VariableAccess] x
# 4| Type = [IntType] int
# 4| ValueCategory = lvalue
# 4| getExpr().getFullyConverted(): [ReferenceToExpr] (reference to)
# 4| Type = [LValueReferenceType] const type_info &
# 4| ValueCategory = prvalue
# 5| getStmt(1): [DeclStmt] declaration
# 5| getDeclarationEntry(0): [VariableDeclarationEntry] definition of t2
# 5| Type = [LValueReferenceType] const type_info &
# 5| getVariable().getInitializer(): [Initializer] initializer for t2
# 5| getExpr(): [TypeidOperator] typeid ...
# 5| Type = [SpecifiedType] const type_info
# 5| ValueCategory = lvalue
# 5| getExpr().getFullyConverted(): [ReferenceToExpr] (reference to)
# 5| Type = [LValueReferenceType] const type_info &
# 5| ValueCategory = prvalue
# 6| getStmt(2): [ReturnStmt] return ...
typeinfo:
# 4| [CopyAssignmentOperator] std::type_info& std::type_info::operator=(std::type_info const&)
# 4| <params>:
#-----| getParameter(0): [Parameter] (unnamed parameter 0)
#-----| Type = [LValueReferenceType] const type_info &
# 4| [MoveAssignmentOperator] std::type_info& std::type_info::operator=(std::type_info&&)
# 4| <params>:
#-----| getParameter(0): [Parameter] (unnamed parameter 0)
#-----| Type = [RValueReferenceType] type_info &&
11 changes: 11 additions & 0 deletions cpp/ql/test/library-tests/ir/ir/aliased_ir.expected
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Expand Up @@ -39973,3 +39973,14 @@ try_except.cpp:

# 44| Block 7
# 44| v44_10(void) = Unreached :

type_info_test.cpp:
# 3| void type_info_test(int)
# 3| Block 0
# 3| v3_1(void) = EnterFunction :
# 3| m3_2(unknown) = AliasedDefinition :
# 3| m3_3(unknown) = InitializeNonLocal :
# 3| m3_4(unknown) = Chi : total:m3_2, partial:m3_3
# 3| r3_5(glval<int>) = VariableAddress[x] :
# 3| m3_6(int) = InitializeParameter[x] : &:r3_5
# 4| r4_1(glval<type_info &>) = VariableAddress[t1] :
1 change: 1 addition & 0 deletions cpp/ql/test/library-tests/ir/ir/aliased_ssa_consistency.expected
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Expand Up @@ -6,6 +6,7 @@ missingOperandType
duplicateChiOperand
sideEffectWithoutPrimary
instructionWithoutSuccessor
| type_info_test.cpp:4:25:4:26 | VariableAddress: definition of t1 | Instruction 'VariableAddress: definition of t1' has no successors in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
ambiguousSuccessors
unexplainedLoop
unnecessaryPhiInstruction
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1 change: 1 addition & 0 deletions cpp/ql/test/library-tests/ir/ir/aliased_ssa_consistency_unsound.expected
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Expand Up @@ -6,6 +6,7 @@ missingOperandType
duplicateChiOperand
sideEffectWithoutPrimary
instructionWithoutSuccessor
| type_info_test.cpp:4:25:4:26 | VariableAddress: definition of t1 | Instruction 'VariableAddress: definition of t1' has no successors in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
ambiguousSuccessors
unexplainedLoop
unnecessaryPhiInstruction
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7 changes: 7 additions & 0 deletions cpp/ql/test/library-tests/ir/ir/raw_consistency.expected
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@@ -1,11 +1,16 @@
missingOperand
| type_info_test.cpp:4:30:4:38 | CopyValue: (reference to) | Instruction 'CopyValue' is missing an expected operand with tag 'Unary' in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
| type_info_test.cpp:5:30:5:40 | CopyValue: (reference to) | Instruction 'CopyValue' is missing an expected operand with tag 'Unary' in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
unexpectedOperand
duplicateOperand
missingPhiOperand
missingOperandType
duplicateChiOperand
sideEffectWithoutPrimary
instructionWithoutSuccessor
| type_info_test.cpp:4:25:4:26 | VariableAddress: definition of t1 | Instruction 'VariableAddress: definition of t1' has no successors in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
| type_info_test.cpp:4:37:4:37 | VariableAddress: x | Instruction 'VariableAddress: x' has no successors in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
| type_info_test.cpp:5:25:5:26 | VariableAddress: definition of t2 | Instruction 'VariableAddress: definition of t2' has no successors in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
ambiguousSuccessors
unexplainedLoop
unnecessaryPhiInstruction
Expand All @@ -21,6 +26,8 @@ lostReachability
backEdgeCountMismatch
useNotDominatedByDefinition
| ir.cpp:1535:8:1535:8 | Unary | Operand 'Unary' is not dominated by its definition in function '$@'. | ir.cpp:1535:8:1535:8 | void StructuredBindingDataMemberStruct::StructuredBindingDataMemberStruct() | void StructuredBindingDataMemberStruct::StructuredBindingDataMemberStruct() |
| type_info_test.cpp:4:25:4:26 | Address | Operand 'Address' is not dominated by its definition in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
| type_info_test.cpp:5:25:5:26 | Address | Operand 'Address' is not dominated by its definition in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
switchInstructionWithoutDefaultEdge
notMarkedAsConflated
wronglyMarkedAsConflated
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26 changes: 26 additions & 0 deletions cpp/ql/test/library-tests/ir/ir/raw_ir.expected
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Expand Up @@ -38102,3 +38102,29 @@ try_except.cpp:
# 54| v54_1(void) = NoOp :
# 44| v44_9(void) = ReturnVoid :
#-----| Goto -> Block 1

type_info_test.cpp:
# 3| void type_info_test(int)
# 3| Block 0
# 3| v3_1(void) = EnterFunction :
# 3| mu3_2(unknown) = AliasedDefinition :
# 3| mu3_3(unknown) = InitializeNonLocal :
# 3| r3_4(glval<int>) = VariableAddress[x] :
# 3| mu3_5(int) = InitializeParameter[x] : &:r3_4
# 4| r4_1(glval<type_info &>) = VariableAddress[t1] :

# 4| Block 1
# 4| r4_2(glval<int>) = VariableAddress[x] :

# 4| Block 2
# 4| r4_3(type_info &) = CopyValue :
# 4| mu4_4(type_info &) = Store[t1] : &:r4_1, r4_3
# 5| r5_1(glval<type_info &>) = VariableAddress[t2] :

# 5| Block 3
# 5| r5_2(type_info &) = CopyValue :
# 5| mu5_3(type_info &) = Store[t2] : &:r5_1, r5_2
# 6| v6_1(void) = NoOp :
# 3| v3_6(void) = ReturnVoid :
# 3| v3_7(void) = AliasedUse : ~m?
# 3| v3_8(void) = ExitFunction :
8 changes: 8 additions & 0 deletions cpp/ql/test/library-tests/ir/ir/type_info_test.cpp
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@@ -0,0 +1,8 @@
#include <typeinfo>

void type_info_test(int x) {
const std::type_info &t1 = typeid(x);
const std::type_info &t2 = typeid(int);
}

// semmle-extractor-options: -I.
5 changes: 5 additions & 0 deletions cpp/ql/test/library-tests/ir/ir/typeinfo
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@@ -0,0 +1,5 @@
#pragma once

namespace std{
class type_info {};
}
1 change: 1 addition & 0 deletions cpp/ql/test/library-tests/ir/ir/unaliased_ssa_consistency.expected
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Expand Up @@ -6,6 +6,7 @@ missingOperandType
duplicateChiOperand
sideEffectWithoutPrimary
instructionWithoutSuccessor
| type_info_test.cpp:4:25:4:26 | VariableAddress: definition of t1 | Instruction 'VariableAddress: definition of t1' has no successors in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
ambiguousSuccessors
unexplainedLoop
unnecessaryPhiInstruction
Expand Down
1 change: 1 addition & 0 deletions cpp/ql/test/library-tests/ir/ir/unaliased_ssa_consistency_unsound.expected
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ missingOperandType
duplicateChiOperand
sideEffectWithoutPrimary
instructionWithoutSuccessor
| type_info_test.cpp:4:25:4:26 | VariableAddress: definition of t1 | Instruction 'VariableAddress: definition of t1' has no successors in function '$@'. | type_info_test.cpp:3:6:3:19 | void type_info_test(int) | void type_info_test(int) |
ambiguousSuccessors
unexplainedLoop
unnecessaryPhiInstruction
Expand Down