[clang] ba8cda9 - [analyzer] Stability improvement for IteratorModeling
Denys Petrov via cfe-commits
cfe-commits at lists.llvm.org
Wed May 6 04:16:45 PDT 2020
Author: Denys Petrov
Date: 2020-05-06T14:16:39+03:00
New Revision: ba8cda989cf884d53596099dc38a0e5a2c351074
URL: https://github.com/llvm/llvm-project/commit/ba8cda989cf884d53596099dc38a0e5a2c351074
DIFF: https://github.com/llvm/llvm-project/commit/ba8cda989cf884d53596099dc38a0e5a2c351074.diff
LOG: [analyzer] Stability improvement for IteratorModeling
Summary:
Some function path may lead to crash.
Fixed using local variable outside the scope through a pointer.
Fixed minor misspellings.
Added regression test.
This patch covers a bug https://bugs.llvm.org/show_bug.cgi?id=41485
Reviewed By: baloghadamsoftware
Differential Revision: https://reviews.llvm.org/D78289
Added:
Modified:
clang/lib/StaticAnalyzer/Checkers/IteratorModeling.cpp
clang/test/Analysis/iterator-range.cpp
Removed:
################################################################################
diff --git a/clang/lib/StaticAnalyzer/Checkers/IteratorModeling.cpp b/clang/lib/StaticAnalyzer/Checkers/IteratorModeling.cpp
index 2850c6d39322..e35918edbf89 100644
--- a/clang/lib/StaticAnalyzer/Checkers/IteratorModeling.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/IteratorModeling.cpp
@@ -402,7 +402,7 @@ void IteratorModeling::handleComparison(CheckerContext &C, const Expr *CE,
if (!Cont)
return;
- // At least one of the iterators have recorded positions. If one of them has
+ // At least one of the iterators has recorded positions. If one of them does
// not then create a new symbol for the offset.
SymbolRef Sym;
if (!LPos || !RPos) {
@@ -422,7 +422,7 @@ void IteratorModeling::handleComparison(CheckerContext &C, const Expr *CE,
RPos = getIteratorPosition(State, RVal);
}
- // We cannot make assumpotions on `UnknownVal`. Let us conjure a symbol
+ // We cannot make assumptions on `UnknownVal`. Let us conjure a symbol
// instead.
if (RetVal.isUnknown()) {
auto &SymMgr = C.getSymbolManager();
@@ -532,8 +532,9 @@ void IteratorModeling::handleRandomIncrOrDecr(CheckerContext &C,
return;
const auto *value = &RHS;
+ SVal val;
if (auto loc = RHS.getAs<Loc>()) {
- const auto val = State->getRawSVal(*loc);
+ val = State->getRawSVal(*loc);
value = &val;
}
diff --git a/clang/test/Analysis/iterator-range.cpp b/clang/test/Analysis/iterator-range.cpp
index bdfb04ba3a8c..ad8ce92ecfb8 100644
--- a/clang/test/Analysis/iterator-range.cpp
+++ b/clang/test/Analysis/iterator-range.cpp
@@ -810,6 +810,19 @@ void prev_0_end(const std::vector<int> &V) {
auto j = std::prev(i, 0); // no-warning
}
+// std::prev() with int* for checking Loc value argument
+namespace std {
+template <typename T>
+T prev(T, int *);
+}
+
+void prev_loc_value(const std::vector<int> &V, int o) {
+
+ auto i = return_any_iterator(V.begin());
+ int *offset = &o;
+ auto j = std::prev(i, offset); // no-warning
+}
+
//
// Structure member dereference operators
//
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