[PATCH] D42745: [analyzer] Add support for __builtin_constant_p to BuiltinFunctionChecker

[Felix Kostenzer via Phabricator via cfe-commits]

sp4r74n-117 updated this revision to Diff 133447.
sp4r74n-117 added a comment.

Thanks for the explanation, seems like I was on the wrong track.
I now do realize that my initial approach was in fact duplicating the logic of 'BI__builtin_object_size'.
I've removed most of the changes applied to the checker and extended the 'case' instead.
What remains is the regression test tho.


https://reviews.llvm.org/D42745

Files:
  lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
  test/Analysis/builtin-functions.cpp


Index: test/Analysis/builtin-functions.cpp
===================================================================
--- test/Analysis/builtin-functions.cpp
+++ test/Analysis/builtin-functions.cpp
@@ -64,3 +64,20 @@
                                     // We give up the analysis on this path.
   }
 }
+
+void test_constant_p() {
+  int i = 1;
+  const int j = 2;
+  constexpr int k = 3;
+  clang_analyzer_eval(__builtin_constant_p(42) == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(i) == 0); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(j) == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(k) == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(i + 42) == 0); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(j + 42) == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(k + 42) == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(" ") == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(test_constant_p) == 0); // expected-warning {{TRUE}}
+  clang_analyzer_eval(__builtin_constant_p(k - 3) == 0); // expected-warning {{FALSE}}
+  clang_analyzer_eval(__builtin_constant_p(k - 3) == 1); // expected-warning {{TRUE}}
+}
Index: lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
+++ lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
@@ -97,7 +97,8 @@
     return true;
   }
 
-  case Builtin::BI__builtin_object_size: {
+  case Builtin::BI__builtin_object_size:
+  case Builtin::BI__builtin_constant_p: {
     // This must be resolvable at compile time, so we defer to the constant
     // evaluator for a value.
     SVal V = UnknownVal();


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