From 2902f23a4193d93c2e96daa45587a8c597c0a831 Mon Sep 17 00:00:00 2001 From: Nat Goodspeed Date: Thu, 27 Jun 2019 10:57:34 -0400 Subject: DRTVWR-476: Remove special llcorehttp test memory manager. NickyD discovered that the substitute default allocator used for llcorehttp tests was returning badly-aligned storage, which caused access violations on alignment-sensitive data such as std::atomic. Thanks Nicky!! Moreover, the llcorehttp test assertions regarding memory usage, well- intentioned though they are, have been causing us trouble for years. Many have already been disabled. The problem is that use of test_allocator.h affected *everything* defined with that header file's declarations visible. That inevitably included specific functions in other subsystems. Those functions then (unintentionally) consumed the special allocator, throwing off the memory tracking and making certain memory-related assertions consistently fail. This is a particular, observable bad effect of One Definition Rule violations. Within a given program, C++ allows multiple definitions for the same entity, but requires that all such definitions be the same. Partial visibility of the global operator new() and operator delete() overrides meant that some definitions of certain entities used the default global allocator, some used llcorehttp's. There may have been other, more subtle bad effects of these ODR violations. If one wanted to reimplement verification of the memory consumption of llcorehttp classes: * Each llcorehttp class (for which memory tracking was desired) should declare class-specific operator new() and operator delete() methods. Naturally, these would all consume a central llcorehttp-specific allocator, but that allocator should *not* be named global operator new(). * Presumably that would require runtime indirection to allow using the default allocator in production while substituting the special allocator for tests. * Recording and verifying the memory consumption in each test should be performed in the test-object constructor and destructor, rather than being sprinkled throughout the test() methods. * With that mechanism in place, the test object should provide methods to adjust (or entirely disable) memory verification for a particular test. * The test object should also provide a "yes, we're still consuming llcorehttp memory" method to be used for spot checks in the middle of tests -- instead of sprinkling in explicit comparisons as before. * In fact, the llcorehttp test object in each test_*.hpp file should be derived from a central llcorehttp test-object base class providing those methods. --- indra/llcorehttp/tests/test_refcounted.hpp | 37 +++--------------------------- 1 file changed, 3 insertions(+), 34 deletions(-) (limited to 'indra/llcorehttp/tests/test_refcounted.hpp') diff --git a/indra/llcorehttp/tests/test_refcounted.hpp b/indra/llcorehttp/tests/test_refcounted.hpp index 5dff143e5d..2310812d5a 100644 --- a/indra/llcorehttp/tests/test_refcounted.hpp +++ b/indra/llcorehttp/tests/test_refcounted.hpp @@ -28,9 +28,8 @@ #include "_refcounted.h" -#include "test_allocator.h" - -#if 0 // disable all of this because it's hanging win64 builds? +// disable all of this because it's hanging win64 builds? +#if ! (LL_WINDOWS && ADDRESS_SIZE == 64) using namespace LLCoreInt; namespace tut @@ -39,7 +38,6 @@ namespace tut { // the test objects inherit from this so the member functions and variables // can be referenced directly inside of the test functions. - size_t mMemTotal; }; typedef test_group RefCountedTestGroupType; @@ -51,18 +49,12 @@ namespace tut { set_test_name("RefCounted construction with implicit count"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - // create a new ref counted object with an implicit reference RefCounted * rc = new RefCounted(true); ensure(rc->getRefCount() == 1); // release the implicit reference, causing the object to be released rc->release(); - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } template <> template <> @@ -70,9 +62,6 @@ namespace tut { set_test_name("RefCounted construction without implicit count"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - // create a new ref counted object with an implicit reference RefCounted * rc = new RefCounted(false); ensure(rc->getRefCount() == 0); @@ -83,8 +72,6 @@ namespace tut // release the implicit reference, causing the object to be released rc->release(); - - ensure(mMemTotal == GetMemTotal()); } template <> template <> @@ -92,9 +79,6 @@ namespace tut { set_test_name("RefCounted addRef and release"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - RefCounted * rc = new RefCounted(false); for (int i = 0; i < 1024; ++i) @@ -108,9 +92,6 @@ namespace tut { rc->release(); } - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } template <> template <> @@ -118,9 +99,6 @@ namespace tut { set_test_name("RefCounted isLastRef check"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - RefCounted * rc = new RefCounted(true); // with only one reference, isLastRef should be true @@ -128,9 +106,6 @@ namespace tut // release it to clean up memory rc->release(); - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } template <> template <> @@ -138,9 +113,6 @@ namespace tut { set_test_name("RefCounted noRef check"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - RefCounted * rc = new RefCounted(false); // set the noRef @@ -148,10 +120,7 @@ namespace tut // with only one reference, isLastRef should be true ensure(rc->getRefCount() == RefCounted::NOT_REF_COUNTED); - - // allow this memory leak, but check that we're leaking a known amount - ensure(mMemTotal == (GetMemTotal() - sizeof(RefCounted))); } } -#endif // if 0 +#endif // disabling on Win64 #endif // TEST_LLCOREINT_REF_COUNTED_H_ -- cgit v1.2.3