================
@@ -180,3 +183,58 @@ int test_reference_that_might_be_after_the_end(int idx) {
return ref;
}
+// From: https://github.com/llvm/llvm-project/issues/100762
+extern int arrOf10[10];
+void using_builtin(int x) {
+ __builtin_assume(x > 101); // CallExpr
+ arrOf10[x] = 404; // expected-warning {{Out of bound access to memory}}
+}
+
+void using_assume_attr(int ax) {
+ [[assume(ax > 100)]]; // NullStmt with an "assume" attribute.
+ arrOf10[ax] = 405; // expected-warning {{Out of bound access to memory}}
+}
+
+void using_many_assume_attr(int yx) {
+ [[assume(yx > 104), assume(yx > 200), assume(yx < 300)]]; // NullStmt with
an attribute
+ arrOf10[yx] = 406; // expected-warning{{Out of bound access to memory}}
+}
+
+
+int using_builtin_assume_has_no_sideeffects(int y) {
+ // We should not apply sideeffects of the argument of [[assume(...)]].
+ // "y" should not get incremented;
+ __builtin_assume(++y == 43); // expected-warning {{assumption is ignored
because it contains (potential) side-effects}}
+ clang_analyzer_eval(y == 42); // expected-warning {{FALSE}}
+ return y;
+}
+
+
+
+int using_assume_attr_has_no_sideeffects(int y) {
+
+ // We should not apply sideeffects of the argument of [[assume(...)]].
+ // "y" should not get incremented;
+ [[assume(++y == 43)]]; // expected-warning {{assumption is ignored because
it contains (potential) side-effects}}
+
+ clang_analyzer_eval(y == 42); // expected-warning {{TRUE}} expected-warning
{{FALSE}} FIXME: This should be only TRUE.
+
+ clang_analyzer_eval(y == 43); // expected-warning {{FALSE}} expected-warning
{{TRUE}} FIXME: This should be only FALSE.
+
+ return y;
+}
+
+
+int using_builtinassume_has_no_sideeffects(int u) {
+ // We should not apply sideeffects of the argument of __builtin_assume(...)
+ // "u" should not get incremented;
+ __builtin_assume(++u == 43); // expected-warning {{assumption is ignored
because it contains (potential) side-effects}}
----------------
Xazax-hun wrote:
I am a bit confused why is this not addressed by the `if
(!AssumeExpr->HasSideEffects(Ctx)) {` checks in the code. Any idea?
https://github.com/llvm/llvm-project/pull/129234
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