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yo-hyo-h
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Merge pull request #3499 from aschackmull/java/instanceof-pattern-cfg
Java: Add CFG edges for Java 14 pattern-matching instanceof.
2 parents 732da9c + 796eac1 commit c2de08c

7 files changed

Lines changed: 93 additions & 3 deletions

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‎java/ql/src/semmle/code/java/ControlFlowGraph.qll‎

Lines changed: 20 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -405,7 +405,7 @@ private module ControlFlowGraphImpl {
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* Expressions and statements with CFG edges in post-order AST traversal.
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*
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* This includes most expressions, except those that initiate or propagate branching control
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* flow (`LogicExpr`, `ConditionalExpr`), and parentheses, which aren't in the CFG.
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* flow (`LogicExpr`, `ConditionalExpr`).
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* Only a few statements are included; those with specific side-effects
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* occurring after the evaluation of their children, that is, `Call`, `ReturnStmt`,
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* and `ThrowStmt`. CFG nodes without child nodes in the CFG that may complete
@@ -429,9 +429,10 @@ private module ControlFlowGraphImpl {
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or
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this instanceof CastExpr
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or
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this instanceof InstanceOfExpr
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this instanceof InstanceOfExpr and not this.(InstanceOfExpr).isPattern()
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or
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this instanceof LocalVariableDeclExpr
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this instanceof LocalVariableDeclExpr and
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not this = any(InstanceOfExpr ioe).getLocalVariableDeclExpr()
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or
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this instanceof RValue
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or
@@ -573,6 +574,8 @@ private module ControlFlowGraphImpl {
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or
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result = first(n.(PostOrderNode).firstChild())
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or
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result = first(n.(InstanceOfExpr).getExpr())
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or
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result = first(n.(SynchronizedStmt).getExpr())
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or
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result = n and
@@ -707,6 +710,12 @@ private module ControlFlowGraphImpl {
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last(condexpr.getTrueExpr(), last, completion)
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)
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or
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exists(InstanceOfExpr ioe | ioe.isPattern() and ioe = n |
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last = n and completion = basicBooleanCompletion(false)
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or
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last = ioe.getLocalVariableDeclExpr() and completion = basicBooleanCompletion(true)
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)
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or
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// The last node of a node executed in post-order is the node itself.
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n.(PostOrderNode).mayCompleteNormally() and last = n and completion = NormalCompletion()
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or
@@ -916,6 +925,14 @@ private module ControlFlowGraphImpl {
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result = first(e.getFalseExpr())
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)
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or
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exists(InstanceOfExpr ioe | ioe.isPattern() |
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last(ioe.getExpr(), n, completion) and completion = NormalCompletion() and result = ioe
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or
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n = ioe and
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result = ioe.getLocalVariableDeclExpr() and
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completion = basicBooleanCompletion(true)
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)
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or
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// In other expressions control flows from left to right and ends in the node itself.
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exists(PostOrderNode p, int i |
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last(p.getChildNode(i), n, completion) and completion = NormalCompletion()

‎java/ql/test/library-tests/ssa/TestInstanceOfPattern.java‎

Lines changed: 31 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,31 @@
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class TestInstanceOfPattern {
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private String s = "field";
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void test(Object obj) {
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if (obj instanceof String s) {
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if (s.contains("abc")) {}
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} else {
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if (s.contains("def")) {}
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}
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}
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void test2(Object obj) {
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if (!(obj instanceof String s)) {
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if (s.contains("abc")) {}
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} else {
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if (s.contains("def")) {}
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}
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}
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void test3(Object obj) {
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if (obj instanceof String s && s.length() > 5) {
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if (s.contains("abc")) {}
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} else {
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if (s.contains("def")) {}
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}
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}
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void test4(Object obj) {
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if (obj instanceof String s || s.length() > 5) {
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if (s.contains("abc")) {}
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} else {
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if (s.contains("def")) {}
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}
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}
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}

‎java/ql/test/library-tests/ssa/adjacentUses.expected‎

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Original file line numberDiff line numberDiff line change
@@ -30,3 +30,6 @@
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| Test.java:20:14:20:14 | y | Test.java:31:14:31:14 | y |
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| Test.java:27:19:27:19 | i | Test.java:28:9:28:9 | i |
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| Test.java:28:9:28:9 | i | Test.java:27:25:27:25 | i |
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| TestInstanceOfPattern.java:18:34:18:34 | s | TestInstanceOfPattern.java:19:8:19:8 | s |
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| TestInstanceOfPattern.java:25:34:25:34 | s | TestInstanceOfPattern.java:26:8:26:8 | s |
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| TestInstanceOfPattern.java:25:34:25:34 | s | TestInstanceOfPattern.java:28:8:28:8 | s |

‎java/ql/test/library-tests/ssa/firstUse.expected‎

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Original file line numberDiff line numberDiff line change
@@ -58,3 +58,15 @@
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| Test.java:27:25:27:27 | SSA def(i) | Test.java:27:19:27:19 | i |
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| Test.java:28:4:28:9 | SSA def(x) | Test.java:28:4:28:4 | x |
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| Test.java:28:4:28:9 | SSA def(x) | Test.java:31:10:31:10 | x |
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| TestInstanceOfPattern.java:3:24:9:2 | SSA init(obj) | TestInstanceOfPattern.java:4:7:4:9 | obj |
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| TestInstanceOfPattern.java:4:29:4:29 | SSA def(s) | TestInstanceOfPattern.java:5:8:5:8 | s |
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| TestInstanceOfPattern.java:7:8:7:8 | SSA impl upd[untracked](this.s) | TestInstanceOfPattern.java:7:8:7:8 | s |
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| TestInstanceOfPattern.java:10:25:16:2 | SSA init(obj) | TestInstanceOfPattern.java:11:9:11:11 | obj |
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| TestInstanceOfPattern.java:11:31:11:31 | SSA def(s) | TestInstanceOfPattern.java:14:8:14:8 | s |
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| TestInstanceOfPattern.java:12:8:12:8 | SSA impl upd[untracked](this.s) | TestInstanceOfPattern.java:12:8:12:8 | s |
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| TestInstanceOfPattern.java:17:25:23:2 | SSA init(obj) | TestInstanceOfPattern.java:18:7:18:9 | obj |
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| TestInstanceOfPattern.java:18:29:18:29 | SSA def(s) | TestInstanceOfPattern.java:18:34:18:34 | s |
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| TestInstanceOfPattern.java:21:8:21:8 | SSA impl upd[untracked](this.s) | TestInstanceOfPattern.java:21:8:21:8 | s |
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| TestInstanceOfPattern.java:24:25:30:2 | SSA init(obj) | TestInstanceOfPattern.java:25:7:25:9 | obj |
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| TestInstanceOfPattern.java:24:25:30:2 | SSA init(this.s) | TestInstanceOfPattern.java:25:34:25:34 | s |
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| TestInstanceOfPattern.java:24:25:30:2 | SSA init(this.s) | TestInstanceOfPattern.java:26:8:26:8 | s |

‎java/ql/test/library-tests/ssa/options‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
//semmle-extractor-options: --javac-args --enable-preview -source 14 -target 14

‎java/ql/test/library-tests/ssa/ssaDef.expected‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -91,3 +91,15 @@
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| Test.java:27:8:27:16 | i | Test.java:27:12:27:16 | i | SSA def(i) |
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| Test.java:27:8:27:16 | i | Test.java:27:19:27:19 | i | SSA phi(i) |
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| Test.java:27:8:27:16 | i | Test.java:27:25:27:27 | ...++ | SSA def(i) |
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| TestInstanceOfPattern.java:3:12:3:21 | obj | TestInstanceOfPattern.java:3:24:9:2 | stmt | SSA init(obj) |
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| TestInstanceOfPattern.java:4:22:4:29 | s | TestInstanceOfPattern.java:4:29:4:29 | s | SSA def(s) |
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| TestInstanceOfPattern.java:7:8:7:8 | this.s | TestInstanceOfPattern.java:7:8:7:8 | s | SSA impl upd[untracked](this.s) |
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| TestInstanceOfPattern.java:10:13:10:22 | obj | TestInstanceOfPattern.java:10:25:16:2 | stmt | SSA init(obj) |
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| TestInstanceOfPattern.java:11:24:11:31 | s | TestInstanceOfPattern.java:11:31:11:31 | s | SSA def(s) |
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| TestInstanceOfPattern.java:12:8:12:8 | this.s | TestInstanceOfPattern.java:12:8:12:8 | s | SSA impl upd[untracked](this.s) |
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| TestInstanceOfPattern.java:17:13:17:22 | obj | TestInstanceOfPattern.java:17:25:23:2 | stmt | SSA init(obj) |
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| TestInstanceOfPattern.java:18:22:18:29 | s | TestInstanceOfPattern.java:18:29:18:29 | s | SSA def(s) |
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| TestInstanceOfPattern.java:21:8:21:8 | this.s | TestInstanceOfPattern.java:21:8:21:8 | s | SSA impl upd[untracked](this.s) |
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| TestInstanceOfPattern.java:24:13:24:22 | obj | TestInstanceOfPattern.java:24:25:30:2 | stmt | SSA init(obj) |
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| TestInstanceOfPattern.java:25:22:25:29 | s | TestInstanceOfPattern.java:25:29:25:29 | s | SSA def(s) |
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| TestInstanceOfPattern.java:25:34:25:34 | this.s | TestInstanceOfPattern.java:24:25:30:2 | stmt | SSA init(this.s) |

‎java/ql/test/library-tests/ssa/ssaUse.expected‎

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -58,3 +58,17 @@
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| Test.java:27:8:27:16 | i | Test.java:27:19:27:19 | i | SSA phi(i) | Test.java:27:19:27:19 | i |
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| Test.java:27:8:27:16 | i | Test.java:27:19:27:19 | i | SSA phi(i) | Test.java:27:25:27:25 | i |
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| Test.java:27:8:27:16 | i | Test.java:27:19:27:19 | i | SSA phi(i) | Test.java:28:9:28:9 | i |
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| TestInstanceOfPattern.java:3:12:3:21 | obj | TestInstanceOfPattern.java:3:24:9:2 | stmt | SSA init(obj) | TestInstanceOfPattern.java:4:7:4:9 | obj |
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| TestInstanceOfPattern.java:4:22:4:29 | s | TestInstanceOfPattern.java:4:29:4:29 | s | SSA def(s) | TestInstanceOfPattern.java:5:8:5:8 | s |
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| TestInstanceOfPattern.java:7:8:7:8 | this.s | TestInstanceOfPattern.java:7:8:7:8 | s | SSA impl upd[untracked](this.s) | TestInstanceOfPattern.java:7:8:7:8 | s |
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| TestInstanceOfPattern.java:10:13:10:22 | obj | TestInstanceOfPattern.java:10:25:16:2 | stmt | SSA init(obj) | TestInstanceOfPattern.java:11:9:11:11 | obj |
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| TestInstanceOfPattern.java:11:24:11:31 | s | TestInstanceOfPattern.java:11:31:11:31 | s | SSA def(s) | TestInstanceOfPattern.java:14:8:14:8 | s |
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| TestInstanceOfPattern.java:12:8:12:8 | this.s | TestInstanceOfPattern.java:12:8:12:8 | s | SSA impl upd[untracked](this.s) | TestInstanceOfPattern.java:12:8:12:8 | s |
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| TestInstanceOfPattern.java:17:13:17:22 | obj | TestInstanceOfPattern.java:17:25:23:2 | stmt | SSA init(obj) | TestInstanceOfPattern.java:18:7:18:9 | obj |
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| TestInstanceOfPattern.java:18:22:18:29 | s | TestInstanceOfPattern.java:18:29:18:29 | s | SSA def(s) | TestInstanceOfPattern.java:18:34:18:34 | s |
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| TestInstanceOfPattern.java:18:22:18:29 | s | TestInstanceOfPattern.java:18:29:18:29 | s | SSA def(s) | TestInstanceOfPattern.java:19:8:19:8 | s |
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| TestInstanceOfPattern.java:21:8:21:8 | this.s | TestInstanceOfPattern.java:21:8:21:8 | s | SSA impl upd[untracked](this.s) | TestInstanceOfPattern.java:21:8:21:8 | s |
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| TestInstanceOfPattern.java:24:13:24:22 | obj | TestInstanceOfPattern.java:24:25:30:2 | stmt | SSA init(obj) | TestInstanceOfPattern.java:25:7:25:9 | obj |
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| TestInstanceOfPattern.java:25:34:25:34 | this.s | TestInstanceOfPattern.java:24:25:30:2 | stmt | SSA init(this.s) | TestInstanceOfPattern.java:25:34:25:34 | s |
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| TestInstanceOfPattern.java:25:34:25:34 | this.s | TestInstanceOfPattern.java:24:25:30:2 | stmt | SSA init(this.s) | TestInstanceOfPattern.java:26:8:26:8 | s |
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| TestInstanceOfPattern.java:25:34:25:34 | this.s | TestInstanceOfPattern.java:24:25:30:2 | stmt | SSA init(this.s) | TestInstanceOfPattern.java:28:8:28:8 | s |

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