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Merge pull request #2922 from tausbn/python-fix-multi-assign-points-to
Python: Fix bug in `multi_assignment_points_to`.
2 parents b030315 + c724b17 commit 290e33a

16 files changed

Lines changed: 105 additions & 8 deletions

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‎python/ql/src/semmle/python/essa/Essa.qll‎

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@@ -608,6 +608,7 @@ class MultiAssignmentDefinition extends EssaNodeDefinition {
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)
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}
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/** Holds if `this` has (zero-based) index `index` in `lhs`. */
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predicate indexOf(int index, SequenceNode lhs) {
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SsaSource::multi_assignment_definition(this.getSourceVariable(), this.getDefiningNode(), index, lhs)
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}

‎python/ql/src/semmle/python/pointsto/PointsTo.qll‎

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Original file line numberDiff line numberDiff line change
@@ -506,12 +506,21 @@ cached module PointsToInternal {
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value = sequence.getItem(index)
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}
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pragma [noinline]
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private predicate multi_assignment_points_to(MultiAssignmentDefinition def, PointsToContext context, ObjectInternal value, ControlFlowNode origin) {
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exists(int index, ControlFlowNode rhs, SequenceObjectInternal sequence |
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def.indexOf(index, rhs) and
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sequence_index_points_to(rhs, context, sequence, value, index) and
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pragma[noinline]
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private predicate multi_assignment_points_to(
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MultiAssignmentDefinition def, PointsToContext context, ObjectInternal value,
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ControlFlowNode origin
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) {
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exists(int index, ControlFlowNode lhs, ControlFlowNode rhs, ObjectInternal sequence |
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def.indexOf(index, lhs) and
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lhs.(DefinitionNode).getValue() = rhs and
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origin = def.getDefiningNode()
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|
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sequence_index_points_to(rhs, context, sequence, value, index)
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or
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pointsTo(rhs, context, sequence, _) and
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sequence.subscriptUnknown() and
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value = TUnknown()
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)
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}
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‎python/ql/test/library-tests/PointsTo/new/Dataflow.expected‎

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@@ -62,6 +62,10 @@
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| a_simple.py:49 | g_0 = a |
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| a_simple.py:49 | h_0 = b |
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| a_simple.py:49 | i_0 = c |
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| a_simple.py:53 | l_0 = BinaryExpr[0] |
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| a_simple.py:53 | m_0 = BinaryExpr[1] |
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| a_simple.py:56 | s_0 = a[0] |
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| a_simple.py:56 | u_0 = a[1] |
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| b_condition.py:0 | __name___0 = ScopeEntryDefinition |
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| b_condition.py:0 | __package___0 = ScopeEntryDefinition |
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| b_condition.py:0 | double_attr_check_0 = ScopeEntryDefinition |

‎python/ql/test/library-tests/PointsTo/new/Definitions.expected‎

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@@ -45,6 +45,10 @@
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| a_simple.py:49 | Local Variable g | AssignmentDefinition |
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| a_simple.py:49 | Local Variable h | AssignmentDefinition |
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| a_simple.py:49 | Local Variable i | AssignmentDefinition |
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| a_simple.py:53 | Local Variable l | MultiAssignmentDefinition |
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| a_simple.py:53 | Local Variable m | MultiAssignmentDefinition |
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| a_simple.py:56 | Local Variable s | MultiAssignmentDefinition |
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| a_simple.py:56 | Local Variable u | MultiAssignmentDefinition |
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| b_condition.py:0 | Global Variable __name__ | ScopeEntryDefinition |
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| b_condition.py:0 | Global Variable __package__ | ScopeEntryDefinition |
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| b_condition.py:0 | Global Variable double_attr_check | ScopeEntryDefinition |

‎python/ql/test/library-tests/PointsTo/new/PointsToUnknown.expected‎

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Original file line numberDiff line numberDiff line change
@@ -1,19 +1,29 @@
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| a_simple.py:20 | ControlFlowNode for For | 20 |
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| a_simple.py:20 | ControlFlowNode for seq | 18 |
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| a_simple.py:21 | ControlFlowNode for x | 20 |
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| a_simple.py:24 | ControlFlowNode for x | 23 |
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| a_simple.py:29 | ControlFlowNode for For | 29 |
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| a_simple.py:29 | ControlFlowNode for x | 27 |
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| a_simple.py:30 | ControlFlowNode for p | 29 |
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| a_simple.py:35 | ControlFlowNode for Subscript | 35 |
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| a_simple.py:36 | ControlFlowNode for Subscript | 36 |
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| a_simple.py:40 | ControlFlowNode for a | 38 |
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| a_simple.py:40 | ControlFlowNode for b | 38 |
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| a_simple.py:40 | ControlFlowNode for c | 38 |
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| a_simple.py:46 | ControlFlowNode for x | 42 |
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| a_simple.py:47 | ControlFlowNode for y | 42 |
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| a_simple.py:48 | ControlFlowNode for z | 42 |
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| a_simple.py:49 | ControlFlowNode for a | 38 |
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| a_simple.py:49 | ControlFlowNode for b | 38 |
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| a_simple.py:49 | ControlFlowNode for c | 38 |
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| a_simple.py:50 | ControlFlowNode for g | 38 |
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| a_simple.py:51 | ControlFlowNode for h | 38 |
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| a_simple.py:52 | ControlFlowNode for i | 38 |
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| a_simple.py:54 | ControlFlowNode for l | 53 |
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| a_simple.py:55 | ControlFlowNode for m | 53 |
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| a_simple.py:56 | ControlFlowNode for a | 38 |
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| a_simple.py:57 | ControlFlowNode for s | 56 |
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| a_simple.py:58 | ControlFlowNode for u | 56 |
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| b_condition.py:5 | ControlFlowNode for IfExp | 5 |
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| b_condition.py:5 | ControlFlowNode for cond | 5 |
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| b_condition.py:5 | ControlFlowNode for unknown | 5 |
@@ -231,6 +241,7 @@
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| r_regressions.py:39 | ControlFlowNode for y | 27 |
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| r_regressions.py:43 | ControlFlowNode for x | 43 |
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| r_regressions.py:43 | ControlFlowNode for x() | 43 |
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| r_regressions.py:44 | ControlFlowNode for data | 43 |
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| r_regressions.py:52 | ControlFlowNode for msg | 51 |
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| r_regressions.py:64 | ControlFlowNode for do_validation | 64 |
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| r_regressions.py:64 | ControlFlowNode for do_validation() | 64 |

‎python/ql/test/library-tests/PointsTo/new/PointsToWithContext.expected‎

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Original file line numberDiff line numberDiff line change
@@ -56,13 +56,23 @@ WARNING: Predicate points_to has been deprecated and may be removed in future (P
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| a_simple.py:41 | ControlFlowNode for t | Tuple | builtin-class tuple | 39 | runtime |
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| a_simple.py:42 | ControlFlowNode for Tuple | Tuple | builtin-class tuple | 40 | runtime |
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| a_simple.py:42 | ControlFlowNode for w | Tuple | builtin-class tuple | 40 | runtime |
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| a_simple.py:43 | ControlFlowNode for p | int 1 | builtin-class int | 41 | runtime |
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| a_simple.py:44 | ControlFlowNode for q | int 2 | builtin-class int | 41 | runtime |
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| a_simple.py:45 | ControlFlowNode for r | int 3 | builtin-class int | 41 | runtime |
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| a_simple.py:47 | ControlFlowNode for y | 'b' | builtin-class str | 42 | runtime |
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| a_simple.py:48 | ControlFlowNode for z | 'c' | builtin-class str | 42 | runtime |
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| a_simple.py:49 | ControlFlowNode for Tuple | Tuple | builtin-class tuple | 49 | runtime |
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| a_simple.py:49 | ControlFlowNode for b | 'b' | builtin-class str | 38 | runtime |
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| a_simple.py:49 | ControlFlowNode for c | 'c' | builtin-class str | 38 | runtime |
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| a_simple.py:49 | ControlFlowNode for h | 'b' | builtin-class str | 38 | runtime |
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| a_simple.py:49 | ControlFlowNode for i | 'c' | builtin-class str | 38 | runtime |
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| a_simple.py:51 | ControlFlowNode for h | 'b' | builtin-class str | 38 | runtime |
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| a_simple.py:52 | ControlFlowNode for i | 'c' | builtin-class str | 38 | runtime |
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| a_simple.py:53 | ControlFlowNode for BinaryExpr | BinaryExpr | builtin-class tuple | 53 | runtime |
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| a_simple.py:53 | ControlFlowNode for IntegerLiteral | int 1 | builtin-class int | 53 | runtime |
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| a_simple.py:53 | ControlFlowNode for IntegerLiteral | int 2 | builtin-class int | 53 | runtime |
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| a_simple.py:53 | ControlFlowNode for Tuple | BinaryExpr | builtin-class tuple | 53 | runtime |
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| a_simple.py:53 | ControlFlowNode for Tuple | Tuple | builtin-class tuple | 53 | runtime |
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| b_condition.py:4 | ControlFlowNode for FunctionExpr | Function f | builtin-class function | 4 | import |
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| b_condition.py:4 | ControlFlowNode for f | Function f | builtin-class function | 4 | import |
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| b_condition.py:5 | ControlFlowNode for IfExp | NoneType None | builtin-class NoneType | 5 | runtime |

‎python/ql/test/library-tests/PointsTo/new/PointsToWithType.expected‎

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@@ -56,13 +56,23 @@ WARNING: Predicate points_to has been deprecated and may be removed in future (P
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| a_simple.py:41 | ControlFlowNode for t | Tuple | builtin-class tuple | 39 |
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| a_simple.py:42 | ControlFlowNode for Tuple | Tuple | builtin-class tuple | 40 |
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| a_simple.py:42 | ControlFlowNode for w | Tuple | builtin-class tuple | 40 |
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| a_simple.py:43 | ControlFlowNode for p | int 1 | builtin-class int | 41 |
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| a_simple.py:44 | ControlFlowNode for q | int 2 | builtin-class int | 41 |
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| a_simple.py:45 | ControlFlowNode for r | int 3 | builtin-class int | 41 |
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| a_simple.py:47 | ControlFlowNode for y | 'b' | builtin-class str | 42 |
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| a_simple.py:48 | ControlFlowNode for z | 'c' | builtin-class str | 42 |
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| a_simple.py:49 | ControlFlowNode for Tuple | Tuple | builtin-class tuple | 49 |
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| a_simple.py:49 | ControlFlowNode for b | 'b' | builtin-class str | 38 |
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| a_simple.py:49 | ControlFlowNode for c | 'c' | builtin-class str | 38 |
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| a_simple.py:49 | ControlFlowNode for h | 'b' | builtin-class str | 38 |
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| a_simple.py:49 | ControlFlowNode for i | 'c' | builtin-class str | 38 |
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| a_simple.py:51 | ControlFlowNode for h | 'b' | builtin-class str | 38 |
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| a_simple.py:52 | ControlFlowNode for i | 'c' | builtin-class str | 38 |
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| a_simple.py:53 | ControlFlowNode for BinaryExpr | BinaryExpr | builtin-class tuple | 53 |
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| a_simple.py:53 | ControlFlowNode for IntegerLiteral | int 1 | builtin-class int | 53 |
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| a_simple.py:53 | ControlFlowNode for IntegerLiteral | int 2 | builtin-class int | 53 |
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| a_simple.py:53 | ControlFlowNode for Tuple | BinaryExpr | builtin-class tuple | 53 |
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| a_simple.py:53 | ControlFlowNode for Tuple | Tuple | builtin-class tuple | 53 |
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| b_condition.py:4 | ControlFlowNode for FunctionExpr | Function f | builtin-class function | 4 |
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| b_condition.py:4 | ControlFlowNode for f | Function f | builtin-class function | 4 |
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| b_condition.py:5 | ControlFlowNode for IfExp | NoneType None | builtin-class NoneType | 5 |

‎python/ql/test/library-tests/PointsTo/new/SSA.expected‎

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@@ -31,6 +31,11 @@ WARNING: Predicate ssa_variable_points_to has been deprecated and may be removed
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| a_simple.py:38 | multi_assign_and_packing_0 = FunctionExpr | Function multi_assign_and_packing | builtin-class function |
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| a_simple.py:39 | t_0 = Tuple | Tuple | builtin-class tuple |
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| a_simple.py:40 | w_0 = Tuple | Tuple | builtin-class tuple |
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| a_simple.py:41 | p_0 = t[0] | int 1 | builtin-class int |
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| a_simple.py:41 | q_0 = t[1] | int 2 | builtin-class int |
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| a_simple.py:41 | r_0 = t[2] | int 3 | builtin-class int |
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| a_simple.py:42 | y_0 = w[1] | 'b' | builtin-class str |
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| a_simple.py:42 | z_0 = w[2] | 'c' | builtin-class str |
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| a_simple.py:49 | h_0 = b | 'b' | builtin-class str |
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| a_simple.py:49 | i_0 = c | 'c' | builtin-class str |
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| b_condition.py:0 | __name___0 = ScopeEntryDefinition | 'code.b_condition' | builtin-class str |

‎python/ql/test/library-tests/PointsTo/new/SourceNodeDefinitions.expected‎

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@@ -46,10 +46,14 @@
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| a_simple.py:38 | Local Variable g | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable h | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable i | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable l | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable m | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable p | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable q | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable r | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable s | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable t | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable u | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable w | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable x | Entry node for Function multi_assign_and_packing | definition |
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| a_simple.py:38 | Local Variable y | Entry node for Function multi_assign_and_packing | definition |
@@ -65,6 +69,10 @@
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| a_simple.py:49 | Local Variable g | ControlFlowNode for g | definition |
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| a_simple.py:49 | Local Variable h | ControlFlowNode for h | definition |
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| a_simple.py:49 | Local Variable i | ControlFlowNode for i | definition |
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| a_simple.py:53 | Local Variable l | ControlFlowNode for l | definition |
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| a_simple.py:53 | Local Variable m | ControlFlowNode for m | definition |
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| a_simple.py:56 | Local Variable s | ControlFlowNode for s | definition |
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| a_simple.py:56 | Local Variable u | ControlFlowNode for u | definition |
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| b_condition.py:0 | Global Variable __name__ | Entry node for Module code.b_condition | definition |
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| b_condition.py:0 | Global Variable __package__ | Entry node for Module code.b_condition | definition |
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| b_condition.py:0 | Global Variable double_attr_check | Entry node for Module code.b_condition | definition |

‎python/ql/test/library-tests/PointsTo/new/SsaUses.expected‎

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| a_simple.py:38 | g_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | h_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | i_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | l_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | m_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | p_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | q_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | r_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | s_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | t_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | u_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | w_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | x_0 | Exit node for Function multi_assign_and_packing |
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| a_simple.py:38 | y_0 | Exit node for Function multi_assign_and_packing |
@@ -87,6 +91,11 @@
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| a_simple.py:50 | g_0 | ControlFlowNode for g |
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| a_simple.py:51 | h_0 | ControlFlowNode for h |
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| a_simple.py:52 | i_0 | ControlFlowNode for i |
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| a_simple.py:54 | l_0 | ControlFlowNode for l |
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| a_simple.py:55 | m_0 | ControlFlowNode for m |
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| a_simple.py:56 | a_0 | ControlFlowNode for a |
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| a_simple.py:57 | s_0 | ControlFlowNode for s |
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| a_simple.py:58 | u_0 | ControlFlowNode for u |
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| b_condition.py:0 | __name___0 | Exit node for Module code.b_condition |
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| b_condition.py:0 | __package___0 | Exit node for Module code.b_condition |
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| b_condition.py:0 | double_attr_check_1 | Exit node for Module code.b_condition |

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