llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-clang-analysis Author: Balazs Benics (steakhal) <details> <summary>Changes</summary> In my previous attempt (#<!-- -->126913) of fixing the flaky case was on a good track when I used the begin locations as a stable ordering. However, I forgot to consider the case when the begin locations are the same among the Exprs. In an `EXPENSIVE_CHECKS` build, arrays are randomly shuffled prior to sorting them. This exposed the flaky behavior much more often basically breaking the "stability" of the vector - as it should. Because of this, I had to revert the previous fix attempt in #<!-- -->127034. To fix this, I use this time `Expr::getID` for a stable ID for an Expr. Hopefully fixes #<!-- -->126619 Hopefully fixes #<!-- -->126804 (cherry picked from commit f378e52ed3c6f8da4973f97f1ef043c2eb0da721) --- Full diff: https://github.com/llvm/llvm-project/pull/139591.diff 2 Files Affected: - (modified) clang/lib/Analysis/LiveVariables.cpp (+9-2) - (modified) clang/test/Analysis/live-stmts.cpp (+2) ``````````diff diff --git a/clang/lib/Analysis/LiveVariables.cpp b/clang/lib/Analysis/LiveVariables.cpp index 481932ee59c8e..5fb5ee767a683 100644 --- a/clang/lib/Analysis/LiveVariables.cpp +++ b/clang/lib/Analysis/LiveVariables.cpp @@ -662,12 +662,19 @@ void LiveVariables::dumpExprLiveness(const SourceManager &M) { } void LiveVariablesImpl::dumpExprLiveness(const SourceManager &M) { + const ASTContext &Ctx = analysisContext.getASTContext(); + auto ByIDs = [&Ctx](const Expr *L, const Expr *R) { + return L->getID(Ctx) < R->getID(Ctx); + }; + // Don't iterate over blockEndsToLiveness directly because it's not sorted. for (const CFGBlock *B : *analysisContext.getCFG()) { - llvm::errs() << "\n[ B" << B->getBlockID() << " (live expressions at block exit) ]\n"; - for (const Expr *E : blocksEndToLiveness[B].liveExprs) { + std::vector<const Expr *> LiveExprs; + llvm::append_range(LiveExprs, blocksEndToLiveness[B].liveExprs); + llvm::sort(LiveExprs, ByIDs); + for (const Expr *E : LiveExprs) { llvm::errs() << "\n"; E->dump(); } diff --git a/clang/test/Analysis/live-stmts.cpp b/clang/test/Analysis/live-stmts.cpp index c60f522588e39..ca2ff6da8b133 100644 --- a/clang/test/Analysis/live-stmts.cpp +++ b/clang/test/Analysis/live-stmts.cpp @@ -44,6 +44,8 @@ int testThatDumperWorks(int x, int y, int z) { // CHECK-NEXT: ImplicitCastExpr {{.*}} <IntegralToBoolean> // CHECK-NEXT: `-ImplicitCastExpr {{.*}} <LValueToRValue> // CHECK-NEXT: `-DeclRefExpr {{.*}} 'x' 'int' +// CHECK-EMPTY: +// CHECK-EMPTY: // CHECK: [ B4 (live expressions at block exit) ] // CHECK-EMPTY: // CHECK-NEXT: DeclRefExpr {{.*}} 'y' 'int' `````````` </details> https://github.com/llvm/llvm-project/pull/139591 _______________________________________________ llvm-branch-commits mailing list llvm-branch-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits
