[PATCH] D48911: [analyzer] Fix GCDAntipatternChecker to only fire when the semaphore is initialized to zero

[George Karpenkov via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rC337212: [analyzer] Fix GCDAntipatternChecker to only fire when the semaphore is… (authored by george.karpenkov, committed by ).
Herald added a subscriber: cfe-commits.

Repository:
  rC Clang

https://reviews.llvm.org/D48911

Files:
  lib/StaticAnalyzer/Checkers/GCDAntipatternChecker.cpp
  test/Analysis/gcdantipatternchecker_test.m


Index: test/Analysis/gcdantipatternchecker_test.m
===================================================================
--- test/Analysis/gcdantipatternchecker_test.m
+++ test/Analysis/gcdantipatternchecker_test.m
@@ -333,3 +333,13 @@
   }];
   dispatch_semaphore_wait(sema1, 100); // expected-warning{{Waiting on a callback using a semaphore}}
 }
+
+void no_warn_on_nonzero_semaphore(MyInterface1 *M) {
+  dispatch_semaphore_t sema1 = dispatch_semaphore_create(1);
+
+  [M acceptBlock:^{
+      dispatch_semaphore_signal(sema1);
+  }];
+  dispatch_semaphore_wait(sema1, 100); // no-warning
+}
+
Index: lib/StaticAnalyzer/Checkers/GCDAntipatternChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/GCDAntipatternChecker.cpp
+++ lib/StaticAnalyzer/Checkers/GCDAntipatternChecker.cpp
@@ -93,7 +93,9 @@
 static auto findGCDAntiPatternWithSemaphore() -> decltype(compoundStmt()) {
 
   const char *SemaphoreBinding = "semaphore_name";
-  auto SemaphoreCreateM = callExpr(callsName("dispatch_semaphore_create"));
+  auto SemaphoreCreateM = callExpr(allOf(
+      callsName("dispatch_semaphore_create"),
+      hasArgument(0, ignoringParenCasts(integerLiteral(equals(0))))));
 
   auto SemaphoreBindingM = anyOf(
       forEachDescendant(


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