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SSA: Distinguish between has and controls branch edge.

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This commit is contained in:
Anders Schack-Mulligen
2025-05-23 09:56:22 +02:00
parent c046a306ba
commit 1d30103559
10 changed files with 91 additions and 31 deletions
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16
javascript/ql/lib/semmle/javascript/dataflow/internal/sharedlib/Ssa.qll
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@@ -75,11 +75,10 @@ module SsaDataflowInput implements DataFlowIntegrationInputSig {
Guard() { this = any(js::ConditionGuardNode g).getTest() }
/**
* 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`.
* Holds if the evaluation of this guard to `branch` corresponds to the edge
* from `bb1` to `bb2`.
*/
predicate controlsBranchEdge(js::BasicBlock bb1, js::BasicBlock bb2, boolean branch) {
predicate hasBranchEdge(js::BasicBlock bb1, js::BasicBlock bb2, boolean branch) {
exists(js::ConditionGuardNode g |
g.getTest() = this and
bb1 = this.getBasicBlock() and
@@ -87,6 +86,15 @@ module SsaDataflowInput implements DataFlowIntegrationInputSig {
branch = g.getOutcome()
)
}
/**
* Holds if this guard evaluating to `branch` controls the control-flow
* branch edge from `bb1` to `bb2`. That is, following the edge from
* `bb1` to `bb2` implies that this guard evaluated to `branch`.
*/
predicate controlsBranchEdge(js::BasicBlock bb1, js::BasicBlock bb2, boolean branch) {
this.hasBranchEdge(bb1, bb2, branch)
}
}
pragma[inline]