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Dataflow: Simplify references to access paths from prior stage. #18258

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merged 14 commits into from
Dec 11, 2024
Merged

Dataflow: Simplify references to access paths from prior stage. #18258

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c8046fa
Dataflow: Drop some ApApprox columns and joins.
aschackmull Dec 10, 2024
7c888eb
Dataflow: Replace some allowsFieldFlow,apa pairs with emptyAp boolean.
aschackmull Dec 10, 2024
d404406
Dataflow: Remove ApApprox column in out-flow.
aschackmull Dec 10, 2024
262f64f
Dataflow: Remove unused columns.
aschackmull Dec 10, 2024
882a985
Dataflow: Remove useless join.
aschackmull Dec 10, 2024
a77adad
Dataflow: Remove more unused columns.
aschackmull Dec 10, 2024
22e0636
Dataflow: Insert a few getApprox calls to remove even more columns.
aschackmull Dec 10, 2024
501cbda
Dataflow: Remove another ApApprox join and related columns.
aschackmull Dec 10, 2024
231bf9d
Dataflow: Drop ApApprox join in fwdFlowStore.
aschackmull Dec 10, 2024
4e155f8
Dataflow: Insert a few getApprox calls to remove ApApprox from fwdFlow.
aschackmull Dec 10, 2024
40f7713
Dataflow: Minor simplification.
aschackmull Dec 10, 2024
da17970
Java: Accept expected file changes.
aschackmull Dec 10, 2024
d6a4080
Dataflow: Address review comment.
aschackmull Dec 11, 2024
cac131d
Dataflow: Rename a couple of predicates.
aschackmull Dec 11, 2024
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4 changes: 4 additions & 0 deletions java/ql/test/library-tests/dataflow/capture/inlinetest.expected
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Original file line number Diff line number Diff line change
Expand Up @@ -171,10 +171,12 @@ edges
| B.java:154:17:154:28 | source(...) : String | B.java:175:5:175:6 | String s2 : String | provenance | |
| B.java:158:7:158:13 | parameter this : MyLocal [String s1] : String | B.java:159:18:159:19 | this : MyLocal [String s1] : String | provenance | |
| B.java:158:7:158:13 | parameter this : MyLocal [String s2] : String | B.java:160:14:160:15 | this : MyLocal [String s2] : String | provenance | |
| B.java:158:7:158:13 | parameter this : MyLocal [String s2] : String | B.java:160:14:160:15 | this : MyLocal [String s2] : String | provenance | |
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Are these test changes expected?

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Yes. When a callable has both flow-through and flow to a sink without flow-through and the difference is dependent on the access path (and not just if it is empty or not), then we generate slightly more nodes, since we can no longer determine with the same level of precision whether we need to remember a summary context or not. To pinpoint it in the code, this is due to the change to PrevStage::parameterMayFlowThrough using an emptyAp boolean instead of ApApprox in its use in callEdgeArgParamRestricted.

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Good to know that this is expected.

| B.java:159:9:159:12 | this [post update] : MyLocal [f] : String | B.java:158:7:158:13 | parameter this [Return] : MyLocal [f] : String | provenance | |
| B.java:159:18:159:19 | s1 : String | B.java:159:9:159:12 | this [post update] : MyLocal [f] : String | provenance | |
| B.java:159:18:159:19 | this : MyLocal [String s1] : String | B.java:159:18:159:19 | s1 : String | provenance | |
| B.java:160:14:160:15 | this : MyLocal [String s2] : String | B.java:160:14:160:15 | s2 | provenance | |
| B.java:160:14:160:15 | this : MyLocal [String s2] : String | B.java:160:14:160:15 | s2 | provenance | |
| B.java:162:12:162:15 | parameter this : MyLocal [String s2] : String | B.java:164:14:164:15 | this : MyLocal [String s2] : String | provenance | |
| B.java:162:12:162:15 | parameter this : MyLocal [f] : String | B.java:163:14:163:14 | this <.field> : MyLocal [f] : String | provenance | |
| B.java:163:14:163:14 | this <.field> : MyLocal [f] : String | B.java:163:14:163:14 | f | provenance | |
Expand Down Expand Up @@ -464,12 +466,14 @@ nodes
| B.java:154:17:154:28 | source(...) : String | semmle.label | source(...) : String |
| B.java:158:7:158:13 | parameter this : MyLocal [String s1] : String | semmle.label | parameter this : MyLocal [String s1] : String |
| B.java:158:7:158:13 | parameter this : MyLocal [String s2] : String | semmle.label | parameter this : MyLocal [String s2] : String |
| B.java:158:7:158:13 | parameter this : MyLocal [String s2] : String | semmle.label | parameter this : MyLocal [String s2] : String |
| B.java:158:7:158:13 | parameter this [Return] : MyLocal [f] : String | semmle.label | parameter this [Return] : MyLocal [f] : String |
| B.java:159:9:159:12 | this [post update] : MyLocal [f] : String | semmle.label | this [post update] : MyLocal [f] : String |
| B.java:159:18:159:19 | s1 : String | semmle.label | s1 : String |
| B.java:159:18:159:19 | this : MyLocal [String s1] : String | semmle.label | this : MyLocal [String s1] : String |
| B.java:160:14:160:15 | s2 | semmle.label | s2 |
| B.java:160:14:160:15 | this : MyLocal [String s2] : String | semmle.label | this : MyLocal [String s2] : String |
| B.java:160:14:160:15 | this : MyLocal [String s2] : String | semmle.label | this : MyLocal [String s2] : String |
| B.java:162:12:162:15 | parameter this : MyLocal [String s2] : String | semmle.label | parameter this : MyLocal [String s2] : String |
| B.java:162:12:162:15 | parameter this : MyLocal [f] : String | semmle.label | parameter this : MyLocal [f] : String |
| B.java:163:14:163:14 | f | semmle.label | f |
Expand Down
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