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Merge pull request github#6640 from yoff/python-add-parameter-default-value-flow-step
Python: add parameter default value flow step
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‎python/change-notes/2021-09-08-add-flow-from-default-values.md

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lgtm,codescanning
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* Function parameters with default values will now see flow from those values.

‎python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPrivate.qll

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@@ -869,6 +869,9 @@ predicate jumpStep(Node nodeFrom, Node nodeTo) {
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module_export(mv.getScope(), r.getAttributeName(), nodeFrom) and
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nodeTo = r
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)
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or
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// Default value for parameter flows to that parameter
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defaultValueFlowStep(nodeFrom, nodeTo)
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}
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/**
@@ -1033,6 +1036,19 @@ predicate kwOverflowStoreStep(CfgNode nodeFrom, DictionaryElementContent c, Node
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)
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}
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predicate defaultValueFlowStep(CfgNode nodeFrom, CfgNode nodeTo) {
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exists(Function f, Parameter p, ParameterDefinition def |
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// `getArgByName` supports, unlike `getAnArg`, keyword-only parameters
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p = f.getArgByName(_) and
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nodeFrom.asExpr() = p.getDefault() and
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// The following expresses
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// nodeTo.(ParameterNode).getParameter() = p
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// without non-monotonic recursion
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def.getParameter() = p and
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nodeTo.getNode() = def.getDefiningNode()
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)
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}
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/**
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* Holds if data can flow from `nodeFrom` to `nodeTo` via a read of content `c`.
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*/

‎python/ql/test/experimental/dataflow/coverage/argumentPassing.py

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@@ -66,9 +66,9 @@ def argument_passing(
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b,
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/,
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c,
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d=arg4,
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d=arg4, #$ arg4 func=argument_passing
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*,
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e=arg5,
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e=arg5, #$ arg5 func=argument_passing
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f,
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**g,
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):
@@ -120,7 +120,7 @@ def test_multiple_kw_args():
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with_multiple_kw_args(**{"b": arg2}, **{"c": arg3}, **{"a": arg1}) #$ arg1 arg2 arg3 func=with_multiple_kw_args
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def with_default_arguments(a=arg1, b=arg2, c=arg3): # Need a mechanism to test default arguments
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def with_default_arguments(a=arg1, b=arg2, c=arg3): #$ arg1 arg2 arg3 func=with_default_arguments
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SINK1(a)
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SINK2(b)
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SINK3(c)

‎python/ql/test/experimental/dataflow/coverage/argumentRouting1.expected

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| argumentPassing.py:120:59:120:69 | ControlFlowNode for Dict [Dictionary element at key a] | argumentPassing.py:120:5:120:70 | KwUnpacked a |
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| argumentPassing.py:120:65:120:68 | ControlFlowNode for arg1 | argumentPassing.py:120:59:120:69 | ControlFlowNode for Dict [Dictionary element at key a] |
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| argumentPassing.py:123:28:123:28 | ControlFlowNode for a | argumentPassing.py:124:11:124:11 | ControlFlowNode for a |
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| argumentPassing.py:123:28:123:28 | ControlFlowNode for a | argumentPassing.py:124:11:124:11 | ControlFlowNode for a |
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| argumentPassing.py:123:30:123:33 | ControlFlowNode for arg1 | argumentPassing.py:123:28:123:28 | ControlFlowNode for a |
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| argumentPassing.py:132:28:132:31 | ControlFlowNode for arg1 | argumentPassing.py:123:28:123:28 | ControlFlowNode for a |
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| argumentPassing.py:138:22:138:24 | ControlFlowNode for foo | argumentPassing.py:139:11:139:13 | ControlFlowNode for foo |
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| argumentPassing.py:160:46:160:49 | ControlFlowNode for arg1 | argumentPassing.py:138:22:138:24 | ControlFlowNode for foo |
@@ -102,6 +104,8 @@ nodes
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| argumentPassing.py:120:59:120:69 | ControlFlowNode for Dict [Dictionary element at key a] | semmle.label | ControlFlowNode for Dict [Dictionary element at key a] |
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| argumentPassing.py:120:65:120:68 | ControlFlowNode for arg1 | semmle.label | ControlFlowNode for arg1 |
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| argumentPassing.py:123:28:123:28 | ControlFlowNode for a | semmle.label | ControlFlowNode for a |
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| argumentPassing.py:123:28:123:28 | ControlFlowNode for a | semmle.label | ControlFlowNode for a |
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| argumentPassing.py:123:30:123:33 | ControlFlowNode for arg1 | semmle.label | ControlFlowNode for arg1 |
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| argumentPassing.py:124:11:124:11 | ControlFlowNode for a | semmle.label | ControlFlowNode for a |
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| argumentPassing.py:132:28:132:31 | ControlFlowNode for arg1 | semmle.label | ControlFlowNode for arg1 |
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| argumentPassing.py:138:22:138:24 | ControlFlowNode for foo | semmle.label | ControlFlowNode for foo |
@@ -207,6 +211,7 @@ subpaths
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| argumentPassing.py:118:27:118:30 | ControlFlowNode for arg1 | argumentPassing.py:118:27:118:30 | ControlFlowNode for arg1 | argumentPassing.py:110:11:110:11 | ControlFlowNode for a | Flow found |
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| argumentPassing.py:119:27:119:30 | ControlFlowNode for arg1 | argumentPassing.py:119:27:119:30 | ControlFlowNode for arg1 | argumentPassing.py:110:11:110:11 | ControlFlowNode for a | Flow found |
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| argumentPassing.py:120:65:120:68 | ControlFlowNode for arg1 | argumentPassing.py:120:65:120:68 | ControlFlowNode for arg1 | argumentPassing.py:110:11:110:11 | ControlFlowNode for a | Flow found |
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| argumentPassing.py:123:30:123:33 | ControlFlowNode for arg1 | argumentPassing.py:123:30:123:33 | ControlFlowNode for arg1 | argumentPassing.py:124:11:124:11 | ControlFlowNode for a | Flow found |
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| argumentPassing.py:132:28:132:31 | ControlFlowNode for arg1 | argumentPassing.py:132:28:132:31 | ControlFlowNode for arg1 | argumentPassing.py:124:11:124:11 | ControlFlowNode for a | Flow found |
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| argumentPassing.py:160:46:160:49 | ControlFlowNode for arg1 | argumentPassing.py:160:46:160:49 | ControlFlowNode for arg1 | argumentPassing.py:139:11:139:13 | ControlFlowNode for foo | Flow found |
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| argumentPassing.py:168:14:168:17 | ControlFlowNode for arg1 | argumentPassing.py:168:14:168:17 | ControlFlowNode for arg1 | argumentPassing.py:166:15:166:15 | ControlFlowNode for a | Flow found |

‎python/ql/test/experimental/dataflow/coverage/argumentRouting2.expected

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@@ -10,6 +10,8 @@ edges
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| argumentPassing.py:120:29:120:39 | ControlFlowNode for Dict [Dictionary element at key b] | argumentPassing.py:120:5:120:70 | KwUnpacked b |
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| argumentPassing.py:120:35:120:38 | ControlFlowNode for arg2 | argumentPassing.py:120:29:120:39 | ControlFlowNode for Dict [Dictionary element at key b] |
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| argumentPassing.py:123:36:123:36 | ControlFlowNode for b | argumentPassing.py:125:11:125:11 | ControlFlowNode for b |
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| argumentPassing.py:123:36:123:36 | ControlFlowNode for b | argumentPassing.py:125:11:125:11 | ControlFlowNode for b |
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| argumentPassing.py:123:38:123:41 | ControlFlowNode for arg2 | argumentPassing.py:123:36:123:36 | ControlFlowNode for b |
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| argumentPassing.py:133:30:133:33 | ControlFlowNode for arg2 | argumentPassing.py:123:36:123:36 | ControlFlowNode for b |
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| argumentPassing.py:138:29:138:34 | ControlFlowNode for kwargs [Dictionary element at key bar] | argumentPassing.py:140:20:140:25 | ControlFlowNode for kwargs [Dictionary element at key bar] |
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| argumentPassing.py:140:5:140:26 | KwUnpacked bar | argumentPassing.py:145:18:145:20 | ControlFlowNode for bar |
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| argumentPassing.py:120:29:120:39 | ControlFlowNode for Dict [Dictionary element at key b] | semmle.label | ControlFlowNode for Dict [Dictionary element at key b] |
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| argumentPassing.py:120:35:120:38 | ControlFlowNode for arg2 | semmle.label | ControlFlowNode for arg2 |
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| argumentPassing.py:123:36:123:36 | ControlFlowNode for b | semmle.label | ControlFlowNode for b |
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| argumentPassing.py:123:36:123:36 | ControlFlowNode for b | semmle.label | ControlFlowNode for b |
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| argumentPassing.py:123:38:123:41 | ControlFlowNode for arg2 | semmle.label | ControlFlowNode for arg2 |
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| argumentPassing.py:125:11:125:11 | ControlFlowNode for b | semmle.label | ControlFlowNode for b |
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| argumentPassing.py:133:30:133:33 | ControlFlowNode for arg2 | semmle.label | ControlFlowNode for arg2 |
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| argumentPassing.py:138:29:138:34 | ControlFlowNode for kwargs [Dictionary element at key bar] | semmle.label | ControlFlowNode for kwargs [Dictionary element at key bar] |
@@ -128,6 +132,7 @@ subpaths
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| argumentPassing.py:105:27:105:30 | ControlFlowNode for arg2 | argumentPassing.py:105:27:105:30 | ControlFlowNode for arg2 | argumentPassing.py:99:11:99:11 | ControlFlowNode for b | Flow found |
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| argumentPassing.py:117:29:117:32 | ControlFlowNode for arg2 | argumentPassing.py:117:29:117:32 | ControlFlowNode for arg2 | argumentPassing.py:111:11:111:11 | ControlFlowNode for b | Flow found |
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| argumentPassing.py:120:35:120:38 | ControlFlowNode for arg2 | argumentPassing.py:120:35:120:38 | ControlFlowNode for arg2 | argumentPassing.py:111:11:111:11 | ControlFlowNode for b | Flow found |
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| argumentPassing.py:123:38:123:41 | ControlFlowNode for arg2 | argumentPassing.py:123:38:123:41 | ControlFlowNode for arg2 | argumentPassing.py:125:11:125:11 | ControlFlowNode for b | Flow found |
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| argumentPassing.py:133:30:133:33 | ControlFlowNode for arg2 | argumentPassing.py:133:30:133:33 | ControlFlowNode for arg2 | argumentPassing.py:125:11:125:11 | ControlFlowNode for b | Flow found |
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| argumentPassing.py:160:36:160:39 | ControlFlowNode for arg2 | argumentPassing.py:160:36:160:39 | ControlFlowNode for arg2 | argumentPassing.py:146:11:146:13 | ControlFlowNode for bar | Flow found |
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| classes.py:565:18:565:21 | ControlFlowNode for arg2 | classes.py:565:18:565:21 | ControlFlowNode for arg2 | classes.py:556:15:556:17 | ControlFlowNode for key | Flow found |

‎python/ql/test/experimental/dataflow/coverage/argumentRouting3.expected

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| argumentPassing.py:120:44:120:54 | ControlFlowNode for Dict [Dictionary element at key c] | argumentPassing.py:120:5:120:70 | KwUnpacked c |
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| argumentPassing.py:120:50:120:53 | ControlFlowNode for arg3 | argumentPassing.py:120:44:120:54 | ControlFlowNode for Dict [Dictionary element at key c] |
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| argumentPassing.py:123:44:123:44 | ControlFlowNode for c | argumentPassing.py:126:11:126:11 | ControlFlowNode for c |
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| argumentPassing.py:123:44:123:44 | ControlFlowNode for c | argumentPassing.py:126:11:126:11 | ControlFlowNode for c |
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| argumentPassing.py:123:46:123:49 | ControlFlowNode for arg3 | argumentPassing.py:123:44:123:44 | ControlFlowNode for c |
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| argumentPassing.py:134:5:134:41 | KwUnpacked c | argumentPassing.py:123:44:123:44 | ControlFlowNode for c |
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| argumentPassing.py:134:30:134:40 | ControlFlowNode for Dict [Dictionary element at key c] | argumentPassing.py:134:5:134:41 | KwUnpacked c |
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| argumentPassing.py:134:36:134:39 | ControlFlowNode for arg3 | argumentPassing.py:134:30:134:40 | ControlFlowNode for Dict [Dictionary element at key c] |
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| argumentPassing.py:120:44:120:54 | ControlFlowNode for Dict [Dictionary element at key c] | semmle.label | ControlFlowNode for Dict [Dictionary element at key c] |
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| argumentPassing.py:120:50:120:53 | ControlFlowNode for arg3 | semmle.label | ControlFlowNode for arg3 |
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| argumentPassing.py:123:44:123:44 | ControlFlowNode for c | semmle.label | ControlFlowNode for c |
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| argumentPassing.py:123:44:123:44 | ControlFlowNode for c | semmle.label | ControlFlowNode for c |
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| argumentPassing.py:123:46:123:49 | ControlFlowNode for arg3 | semmle.label | ControlFlowNode for arg3 |
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| argumentPassing.py:126:11:126:11 | ControlFlowNode for c | semmle.label | ControlFlowNode for c |
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| argumentPassing.py:134:5:134:41 | KwUnpacked c | semmle.label | KwUnpacked c |
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| argumentPassing.py:134:30:134:40 | ControlFlowNode for Dict [Dictionary element at key c] | semmle.label | ControlFlowNode for Dict [Dictionary element at key c] |
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| argumentPassing.py:117:37:117:40 | ControlFlowNode for arg3 | argumentPassing.py:117:37:117:40 | ControlFlowNode for arg3 | argumentPassing.py:112:11:112:11 | ControlFlowNode for c | Flow found |
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| argumentPassing.py:119:41:119:44 | ControlFlowNode for arg3 | argumentPassing.py:119:41:119:44 | ControlFlowNode for arg3 | argumentPassing.py:112:11:112:11 | ControlFlowNode for c | Flow found |
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| argumentPassing.py:120:50:120:53 | ControlFlowNode for arg3 | argumentPassing.py:120:50:120:53 | ControlFlowNode for arg3 | argumentPassing.py:112:11:112:11 | ControlFlowNode for c | Flow found |
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| argumentPassing.py:123:46:123:49 | ControlFlowNode for arg3 | argumentPassing.py:123:46:123:49 | ControlFlowNode for arg3 | argumentPassing.py:126:11:126:11 | ControlFlowNode for c | Flow found |
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| argumentPassing.py:134:36:134:39 | ControlFlowNode for arg3 | argumentPassing.py:134:36:134:39 | ControlFlowNode for arg3 | argumentPassing.py:126:11:126:11 | ControlFlowNode for c | Flow found |
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| argumentPassing.py:160:26:160:29 | ControlFlowNode for arg3 | argumentPassing.py:160:26:160:29 | ControlFlowNode for arg3 | argumentPassing.py:155:11:155:13 | ControlFlowNode for baz | Flow found |
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| classes.py:581:26:581:29 | ControlFlowNode for arg3 | classes.py:581:26:581:29 | ControlFlowNode for arg3 | classes.py:571:15:571:19 | ControlFlowNode for value | Flow found |

‎python/ql/test/experimental/dataflow/coverage/argumentRouting4.expected

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edges
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| argumentPassing.py:69:5:69:5 | ControlFlowNode for d | argumentPassing.py:78:11:78:11 | ControlFlowNode for d |
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| argumentPassing.py:69:7:69:10 | ControlFlowNode for arg4 | argumentPassing.py:69:5:69:5 | ControlFlowNode for d |
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nodes
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| argumentPassing.py:69:5:69:5 | ControlFlowNode for d | semmle.label | ControlFlowNode for d |
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| argumentPassing.py:69:7:69:10 | ControlFlowNode for arg4 | semmle.label | ControlFlowNode for arg4 |
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| argumentPassing.py:78:11:78:11 | ControlFlowNode for d | semmle.label | ControlFlowNode for d |
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#select
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| argumentPassing.py:69:7:69:10 | ControlFlowNode for arg4 | argumentPassing.py:69:7:69:10 | ControlFlowNode for arg4 | argumentPassing.py:78:11:78:11 | ControlFlowNode for d | Flow found |

‎python/ql/test/experimental/dataflow/coverage/argumentRouting5.expected

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| argumentPassing.py:71:5:71:5 | ControlFlowNode for e | argumentPassing.py:79:11:79:11 | ControlFlowNode for e |
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| argumentPassing.py:71:7:71:10 | ControlFlowNode for arg5 | argumentPassing.py:71:5:71:5 | ControlFlowNode for e |
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| argumentPassing.py:71:5:71:5 | ControlFlowNode for e | semmle.label | ControlFlowNode for e |
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| argumentPassing.py:71:7:71:10 | ControlFlowNode for arg5 | semmle.label | ControlFlowNode for arg5 |
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| argumentPassing.py:79:11:79:11 | ControlFlowNode for e | semmle.label | ControlFlowNode for e |
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#select
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| argumentPassing.py:71:7:71:10 | ControlFlowNode for arg5 | argumentPassing.py:71:7:71:10 | ControlFlowNode for arg5 | argumentPassing.py:79:11:79:11 | ControlFlowNode for e | Flow found |

‎python/ql/test/experimental/dataflow/coverage/dataflow.expected

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| test.py:686:43:686:48 | ControlFlowNode for SOURCE | test.py:686:3:686:52 | PosOverflowNode for iterate_star_args() [Tuple element at index 0] |
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| test.py:686:51:686:51 | ControlFlowNode for s | test.py:686:3:686:52 | PosOverflowNode for iterate_star_args() [Tuple element at index 1] |
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| test.py:757:16:757:21 | ControlFlowNode for SOURCE | test.py:760:10:760:36 | ControlFlowNode for return_from_inner_scope() |
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| test.py:795:35:795:35 | ControlFlowNode for x | test.py:796:10:796:10 | ControlFlowNode for x |
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| test.py:795:37:795:42 | ControlFlowNode for SOURCE | test.py:795:35:795:35 | ControlFlowNode for x |
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| test.py:795:48:795:48 | ControlFlowNode for y | test.py:797:10:797:10 | ControlFlowNode for y |
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| test.py:795:50:795:55 | ControlFlowNode for SOURCE | test.py:795:48:795:48 | ControlFlowNode for y |
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| test.py:795:61:795:61 | ControlFlowNode for z | test.py:798:10:798:10 | ControlFlowNode for z |
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| test.py:795:63:795:68 | ControlFlowNode for SOURCE | test.py:795:61:795:61 | ControlFlowNode for z |
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| datamodel.py:35:7:35:7 | ControlFlowNode for a | semmle.label | ControlFlowNode for a |
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| datamodel.py:36:10:36:10 | ControlFlowNode for a | semmle.label | ControlFlowNode for a |
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| test.py:686:51:686:51 | ControlFlowNode for s | semmle.label | ControlFlowNode for s |
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| test.py:757:16:757:21 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
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| test.py:760:10:760:36 | ControlFlowNode for return_from_inner_scope() | semmle.label | ControlFlowNode for return_from_inner_scope() |
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| test.py:795:35:795:35 | ControlFlowNode for x | semmle.label | ControlFlowNode for x |
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| test.py:795:37:795:42 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
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| test.py:795:48:795:48 | ControlFlowNode for y | semmle.label | ControlFlowNode for y |
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| test.py:795:50:795:55 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
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| test.py:795:61:795:61 | ControlFlowNode for z | semmle.label | ControlFlowNode for z |
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| test.py:795:63:795:68 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
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| test.py:796:10:796:10 | ControlFlowNode for x | semmle.label | ControlFlowNode for x |
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| test.py:797:10:797:10 | ControlFlowNode for y | semmle.label | ControlFlowNode for y |
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| test.py:798:10:798:10 | ControlFlowNode for z | semmle.label | ControlFlowNode for z |
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| datamodel.py:38:8:38:13 | ControlFlowNode for SOURCE | datamodel.py:35:7:35:7 | ControlFlowNode for a | datamodel.py:36:10:36:10 | ControlFlowNode for a | datamodel.py:38:6:38:17 | ControlFlowNode for f() |
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| datamodel.py:71:15:71:20 | ControlFlowNode for SOURCE | datamodel.py:44:22:44:22 | ControlFlowNode for x | datamodel.py:46:16:46:16 | ControlFlowNode for x | datamodel.py:71:6:71:24 | ControlFlowNode for Attribute() |
@@ -942,3 +957,6 @@ subpaths
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| test.py:680:10:680:12 | ControlFlowNode for arg | test.py:685:7:685:12 | ControlFlowNode for SOURCE | test.py:680:10:680:12 | ControlFlowNode for arg | Flow found |
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| test.py:680:10:680:12 | ControlFlowNode for arg | test.py:686:43:686:48 | ControlFlowNode for SOURCE | test.py:680:10:680:12 | ControlFlowNode for arg | Flow found |
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| test.py:760:10:760:36 | ControlFlowNode for return_from_inner_scope() | test.py:757:16:757:21 | ControlFlowNode for SOURCE | test.py:760:10:760:36 | ControlFlowNode for return_from_inner_scope() | Flow found |
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| test.py:796:10:796:10 | ControlFlowNode for x | test.py:795:37:795:42 | ControlFlowNode for SOURCE | test.py:796:10:796:10 | ControlFlowNode for x | Flow found |
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| test.py:797:10:797:10 | ControlFlowNode for y | test.py:795:50:795:55 | ControlFlowNode for SOURCE | test.py:797:10:797:10 | ControlFlowNode for y | Flow found |
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| test.py:798:10:798:10 | ControlFlowNode for z | test.py:795:63:795:68 | ControlFlowNode for SOURCE | test.py:798:10:798:10 | ControlFlowNode for z | Flow found |

‎python/ql/test/experimental/dataflow/coverage/test.py

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@expects(3)
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def test_with_default_param_value(x=SOURCE, /, y=SOURCE, *, z=SOURCE):
796-
SINK(x) #$ MISSING:flow="SOURCE, l:-1 -> x"
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SINK(y) #$ MISSING:flow="SOURCE, l:-2 -> y"
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SINK(z) #$ MISSING:flow="SOURCE, l:-3 -> z"
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SINK(x) #$ flow="SOURCE, l:-1 -> x"
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SINK(y) #$ flow="SOURCE, l:-2 -> y"
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SINK(z) #$ flow="SOURCE, l:-3 -> z"

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

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| code/h_classes.py:3:1:3:16 | ControlFlowNode for ClassExpr | code/h_classes.py:10:1:10:9 | ControlFlowNode for type() |
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| code/h_classes.py:3:1:3:16 | ControlFlowNode for ClassExpr | code/h_classes.py:15:5:15:13 | ControlFlowNode for type() |
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| code/l_calls.py:3:13:3:14 | ControlFlowNode for List | code/l_calls.py:4:12:4:12 | ControlFlowNode for x |
4-
| code/l_calls.py:6:13:6:14 | ControlFlowNode for List | code/l_calls.py:7:16:7:16 | ControlFlowNode for x |
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| code/l_calls.py:12:1:12:20 | ControlFlowNode for ClassExpr | code/l_calls.py:16:16:16:18 | ControlFlowNode for cls |
64
| code/l_calls.py:12:1:12:20 | ControlFlowNode for ClassExpr | code/l_calls.py:24:13:24:22 | ControlFlowNode for Attribute() |
75
| code/l_calls.py:12:1:12:20 | ControlFlowNode for ClassExpr | code/l_calls.py:25:16:25:16 | ControlFlowNode for a |

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