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SSA: Replace the Guards interface in the SSA data flow integration.

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This commit is contained in:
Anders Schack-Mulligen
2025-03-05 11:45:10 +01:00
parent a02735326a
commit c6761db2fc
6 changed files with 62 additions and 58 deletions
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21
ruby/ql/lib/codeql/ruby/dataflow/internal/SsaImpl.qll
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@@ -515,21 +515,24 @@ private module DataFlowIntegrationInput implements Impl::DataFlowIntegrationInpu
predicate ssaDefInitializesParam(WriteDefinition def, Parameter p) { p.isInitializedBy(def) }
class Guard extends Cfg::CfgNodes::AstCfgNode {
predicate hasCfgNode(SsaInput::BasicBlock bb, int i) { this = bb.getNode(i) }
/**
* Holds if the control flow branching from `bb1` is dependent on this guard,
* and that the edge from `bb1` to `bb2` corresponds to the evaluation of this
* guard to `branch`.
*/
predicate controlsBranchEdge(SsaInput::BasicBlock bb1, SsaInput::BasicBlock bb2, boolean branch) {
exists(Cfg::SuccessorTypes::ConditionalSuccessor s |
this.getBasicBlock() = bb1 and
bb2 = bb1.getASuccessor(s) and
s.getValue() = branch
)
}
}
/** Holds if the guard `guard` controls block `bb` upon evaluating to `branch`. */
predicate guardControlsBlock(Guard guard, SsaInput::BasicBlock bb, boolean branch) {
Guards::guardControlsBlock(guard, bb, branch)
}
/** Gets an immediate conditional successor of basic block `bb`, if any. */
SsaInput::BasicBlock getAConditionalBasicBlockSuccessor(SsaInput::BasicBlock bb, boolean branch) {
exists(Cfg::SuccessorTypes::ConditionalSuccessor s |
result = bb.getASuccessor(s) and
s.getValue() = branch
)
}
}
private module DataFlowIntegrationImpl = Impl::DataFlowIntegration<DataFlowIntegrationInput>;