hohn/codeql
1
0
Fork 0
mirror of https://github.com/github/codeql.git synced 2026-02-12 13:11:20 +01:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #21202 from MathiasVP/add-is-live-predicate-to-ssa-definition

Browse Source 
C++: Add `isLiveAtEndOfBlock` predicate to `Ssa::Definition`
This commit is contained in:
Mathias Vorreiter Pedersen
2026-01-21 22:50:46 +00:00
committed by GitHub
parent dd415386ea 60ee92d834
commit 73eb3e262d
1 changed files with 19 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/SsaImpl.qll
View File

@@ -940,6 +940,16 @@ module SsaCached {
SsaImpl::phiHasInputFromBlock(phi, inp, bb)
}
cached
predicate uncertainWriteDefinitionInput(Definition uncertain, Definition inp) {
SsaImpl::uncertainWriteDefinitionInput(uncertain, inp)
}
cached
predicate ssaDefReachesEndOfBlock(IRBlock bb, Definition def) {
SsaImpl::ssaDefReachesEndOfBlock(bb, def, _)
}
predicate variableRead = SsaInput::variableRead/4;
predicate variableWrite = SsaInput::variableWrite/4;
@@ -1173,9 +1183,17 @@ class Definition extends SsaImpl::Definition {
private Definition getAPhiInputOrPriorDefinition() {
result = this.(PhiNode).getAnInput()
or
SsaImpl::uncertainWriteDefinitionInput(this, result)
uncertainWriteDefinitionInput(this, result)
}
/**
* Holds if this SSA definition is live at the end of basic block `bb`.
* That is, this definition reaches the end of basic block `bb`, at which
* point it is still live, without crossing another SSA definition of the
* same source variable.
*/
predicate isLiveAtEndOfBlock(IRBlock bb) { ssaDefReachesEndOfBlock(bb, this) }
/**
* Gets a definition that ultimately defines this SSA definition and is
* not itself a phi node.