CPP: Add a test demonstating when a deallocator call exists.

Author: alexet

cpp/ql/test/library-tests/allocators/allocators.expected

@@ -34,11 +34,11 @@ newArrayExprDeallocators
 | allocators.cpp:108:3:108:19 | new[] | FailedInit | void FailedInit::operator delete[](void*, size_t) | 1 | 1 | sized  |
 | allocators.cpp:110:3:110:37 | new[] | FailedInitOveraligned | void FailedInitOveraligned::operator delete[](void*, std::align_val_t, float) | 128 | 128 |  aligned |
 deleteExprs
-| allocators.cpp:59:3:59:35 | delete | int | void operator delete(void*, unsigned long) | 4 | 4 | sized  |
-| allocators.cpp:60:3:60:38 | delete | String | void operator delete(void*, unsigned long) | 8 | 8 | sized  |
-| allocators.cpp:61:3:61:44 | delete | SizedDealloc | void SizedDealloc::operator delete(void*, size_t) | 32 | 1 | sized  |
-| allocators.cpp:62:3:62:43 | delete | Overaligned | void operator delete(void*, unsigned long, std::align_val_t) | 256 | 128 | sized aligned |
-| allocators.cpp:64:3:64:44 | delete | const String | void operator delete(void*, unsigned long) | 8 | 8 | sized  |
+| allocators.cpp:59:3:59:35 | delete | int | void operator delete(void*, unsigned long) | 4 | 4 | sized  | false |
+| allocators.cpp:60:3:60:38 | delete | String | void operator delete(void*, unsigned long) | 8 | 8 | sized  | false |
+| allocators.cpp:61:3:61:44 | delete | SizedDealloc | void SizedDealloc::operator delete(void*, size_t) | 32 | 1 | sized  | true |
+| allocators.cpp:62:3:62:43 | delete | Overaligned | void operator delete(void*, unsigned long, std::align_val_t) | 256 | 128 | sized aligned | false |
+| allocators.cpp:64:3:64:44 | delete | const String | void operator delete(void*, unsigned long) | 8 | 8 | sized  | false |
 deleteArrayExprs
 | allocators.cpp:78:3:78:37 | delete[] | int | void operator delete[](void*, unsigned long) | 4 | 4 | sized  |
 | allocators.cpp:79:3:79:40 | delete[] | String | void operator delete[](void*, unsigned long) | 8 | 8 | sized  |

cpp/ql/test/library-tests/allocators/allocators.ql

@@ -77,7 +77,8 @@ query predicate newArrayExprDeallocators(
 }
 
 query predicate deleteExprs(
-  DeleteExpr expr, string type, string sig, int size, int alignment, string form
+  DeleteExpr expr, string type, string sig, int size, int alignment, string form,
+  boolean hasDeallocatorCall
 ) {
   exists(Function deallocator, Type deletedType |
     expr.getDeallocator() = deallocator and
@@ -90,7 +91,10 @@ query predicate deleteExprs(
       (if expr.hasAlignedDeallocation() then aligned = "aligned" else aligned = "") and
       (if expr.hasSizedDeallocation() then sized = "sized" else sized = "") and
       form = sized + " " + aligned
-    )
+    ) and
+    if exists(expr.getDeallocatorCall())
+    then hasDeallocatorCall = true
+    else hasDeallocatorCall = false
   )
 }