[pulse][objc][nullptr] Copy tests for calling nil blocks from bi-abduction

Summary: Updated the names of the tests with Ok / FN_Bad.

Reviewed By: jvillard

Differential Revision: D28476289

fbshipit-source-id: f6bdc0318

infer/tests/codetoanalyze/objc/pulse/NPENilBlocks.m

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import <Foundation/NSObject.h>
+
+@interface BlockA : NSObject
+@end
+
+@implementation BlockA {
+
+  void (^_block_field)(void);
+}
+
+- (void)doSomethingThenCallback:(void (^)(void))my_block {
+  // null dereference, segfault if my_block is nil
+  my_block();
+}
+
+- (void)FN_assignNilBad {
+
+  void (^my_block)(void) = ^() {
+  };
+  my_block = NULL;
+  my_block(); // Null deref
+}
+
+- (void)checkNotNilOk:(void (^)(void))my_block {
+  // ok to call this block!
+  if (my_block != nil) {
+    my_block();
+  }
+}
+
+- (void)FN_paramAssignNilBad:(void (^)(void))my_block {
+
+  my_block = NULL;
+  my_block(); // Null deref
+}
+
+- (void)FN_paramReassignNilBad:(void (^)(void))my_block_param {
+
+  void (^my_block)(void) = ^() {
+  };
+  my_block = NULL;
+  my_block_param = my_block;
+  my_block_param(); // Null deref
+}
+
+- (void)assignEmptyBlockOk:(void (^)(void))my_block_param {
+
+  void (^my_block)(void) = ^() {
+  };
+  my_block_param = my_block;
+  my_block_param(); // No error here
+}
+
+- (void)checkNotNilBlockAsArgOk:(BOOL)a
+                    block_param:(void (^)(void))block_param {
+
+  void (^my_block)(void) = ^() {
+    if (block_param)
+      block_param(); // No error here
+  };
+
+  if (a) {
+    [self checkNotNilOk:^() {
+      my_block(); // No error here
+    }];
+  }
+}
+
+- (void)FN_ivarNilBlockBad {
+  _block_field(); // Ivar not nullable
+}
+
+- (int)check_nullifyOk {
+  int i = 7;
+  int* x = &i;
+  int (^my_block)(void) = ^() {
+    return *x; // we'll get a false NPE here if we nullify x too early.
+  };
+  return my_block();
+}
+
+@end
+
+void calldoSomethingThenCallbackOk() {
+  BlockA* blockA = [BlockA alloc];
+  void (^my_block)(void) = ^() {
+  };
+  [blockA doSomethingThenCallback:my_block];
+}
+
+void FN_calldoSomethingThenCallbackWithNilBad() {
+  BlockA* blockA = [BlockA alloc];
+  [blockA doSomethingThenCallback:nil];
+}