Rust: Switch test to use dedicated test module.

rust/ql/lib/codeql/rust/dataflow/internal/SsaImpl.qll

@@ -100,12 +100,6 @@ class PhiDefinition = Impl::PhiNode;
 
 module Consistency = Impl::Consistency;
 
-module ExposedForTestingOnly {
-  predicate ssaDefReachesReadExt = Impl::ssaDefReachesReadExt/4;
-
-  predicate phiHasInputFromBlockExt = Impl::phiHasInputFromBlockExt/3;
-}
-
 /** Holds if `v` is read at index `i` in basic block `bb`. */
 private predicate variableReadActual(BasicBlock bb, int i, Variable v) {
   exists(VariableAccess read |

rust/ql/test/library-tests/variables/Ssa.expected

@@ -535,14 +535,15 @@ phi
 phiReadNode
 | main.rs:104:11:105:12 | SSA phi read(s1) | main.rs:102:9:102:10 | s1 |
 | main.rs:493:5:497:5 | SSA phi read(x) | main.rs:492:9:492:9 | x |
-phiReadNodeRead
+phiReadNodeFirstRead
 | main.rs:104:11:105:12 | SSA phi read(s1) | main.rs:102:9:102:10 | s1 | main.rs:105:11:105:12 | s1 |
 | main.rs:493:5:497:5 | SSA phi read(x) | main.rs:492:9:492:9 | x | main.rs:500:19:500:19 | x |
 | main.rs:493:5:497:5 | SSA phi read(x) | main.rs:492:9:492:9 | x | main.rs:502:19:502:19 | x |
 phiReadInput
 | main.rs:104:11:105:12 | SSA phi read(s1) | main.rs:102:9:102:10 | s1 |
-| main.rs:104:11:105:12 | SSA phi read(s1) | main.rs:104:11:105:12 | SSA phi read(s1) |
-| main.rs:493:5:497:5 | SSA phi read(x) | main.rs:492:9:492:9 | x |
+| main.rs:104:11:105:12 | SSA phi read(s1) | main.rs:105:11:105:12 | SSA read(s1) |
+| main.rs:493:5:497:5 | SSA phi read(x) | main.rs:494:19:494:19 | SSA read(x) |
+| main.rs:493:5:497:5 | SSA phi read(x) | main.rs:496:19:496:19 | SSA read(x) |
 ultimateDef
 | main.rs:191:9:191:44 | phi | main.rs:191:22:191:23 | a3 |
 | main.rs:191:9:191:44 | phi | main.rs:191:42:191:43 | a3 |

rust/ql/test/library-tests/variables/Ssa.ql

@@ -3,7 +3,7 @@ import codeql.rust.controlflow.BasicBlocks
 import codeql.rust.controlflow.ControlFlowGraph
 import codeql.rust.dataflow.Ssa
 import codeql.rust.dataflow.internal.SsaImpl
-import ExposedForTestingOnly
+import Impl::TestAdjacentRefs as RefTest
 
 query predicate definition(Ssa::Definition def, Variable v) { def.getSourceVariable() = v }
 
@@ -24,18 +24,22 @@ query predicate phi(Ssa::PhiDefinition phi, Variable v, Ssa::Definition input) {
   phi.getSourceVariable() = v and input = phi.getAnInput()
 }
 
-query predicate phiReadNode(PhiReadNode phi, Variable v) { phi.getSourceVariable() = v }
+query predicate phiReadNode(RefTest::Ref phi, Variable v) {
+  phi.isPhiRead() and phi.getSourceVariable() = v
+}
 
-query predicate phiReadNodeRead(PhiReadNode phi, Variable v, CfgNode read) {
-  phi.getSourceVariable() = v and
-  exists(BasicBlock bb, int i |
-    ssaDefReachesReadExt(v, phi, bb, i) and
+query predicate phiReadNodeFirstRead(RefTest::Ref phi, Variable v, CfgNode read) {
+  exists(RefTest::Ref r, BasicBlock bb, int i |
+    phi.isPhiRead() and
+    RefTest::adjacentRefRead(phi, r) and
+    r.accessAt(bb, i, v) and
     read = bb.getNode(i)
   )
 }
 
-query predicate phiReadInput(PhiReadNode phi, DefinitionExt inp) {
-  phiHasInputFromBlockExt(phi, inp, _)
+query predicate phiReadInput(RefTest::Ref phi, RefTest::Ref inp) {
+  phi.isPhiRead() and
+  RefTest::adjacentRefPhi(inp, phi)
 }
 
 query predicate ultimateDef(Ssa::Definition def, Definition ult) {