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_httpheaders.hpp | 40 ----------------------------- 1 file changed, 40 deletions(-) (limited to 'indra/llcorehttp/tests/test_httpheaders.hpp') diff --git a/indra/llcorehttp/tests/test_httpheaders.hpp b/indra/llcorehttp/tests/test_httpheaders.hpp index c05f1d9429..6aefb5054b 100644 --- a/indra/llcorehttp/tests/test_httpheaders.hpp +++ b/indra/llcorehttp/tests/test_httpheaders.hpp @@ -30,8 +30,6 @@ #include -#include "test_allocator.h" - using namespace LLCoreInt; @@ -43,7 +41,6 @@ struct HttpHeadersTestData { // 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 HttpHeadersTestGroupType; @@ -55,19 +52,12 @@ void HttpHeadersTestObjectType::test<1>() { set_test_name("HttpHeaders construction"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - // create a new ref counted object with an implicit reference HttpHeaders::ptr_t headers = HttpHeaders::ptr_t(new HttpHeaders()); - ensure("Memory being used", mMemTotal < GetMemTotal()); ensure("Nothing in headers", 0 == headers->size()); // release the implicit reference, causing the object to be released headers.reset(); - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } template <> template <> @@ -75,9 +65,6 @@ void HttpHeadersTestObjectType::test<2>() { set_test_name("HttpHeaders construction"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - // create a new ref counted object with an implicit reference HttpHeaders::ptr_t headers = HttpHeaders::ptr_t(new HttpHeaders()); @@ -101,9 +88,6 @@ void HttpHeadersTestObjectType::test<2>() // release the implicit reference, causing the object to be released headers.reset(); - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } template <> template <> @@ -111,9 +95,6 @@ void HttpHeadersTestObjectType::test<3>() { set_test_name("HttpHeaders basic find"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - // create a new ref counted object with an implicit reference HttpHeaders::ptr_t headers = HttpHeaders::ptr_t(new HttpHeaders()); @@ -151,9 +132,6 @@ void HttpHeadersTestObjectType::test<3>() // release the implicit reference, causing the object to be released headers.reset(); - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } template <> template <> @@ -161,9 +139,6 @@ void HttpHeadersTestObjectType::test<4>() { set_test_name("HttpHeaders normalized header entry"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - // create a new ref counted object with an implicit reference HttpHeaders::ptr_t headers = HttpHeaders::ptr_t(new HttpHeaders()); @@ -251,9 +226,6 @@ void HttpHeadersTestObjectType::test<4>() // release the implicit reference, causing the object to be released headers.reset(); - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } // Verify forward iterator finds everything as expected @@ -262,9 +234,6 @@ void HttpHeadersTestObjectType::test<5>() { set_test_name("HttpHeaders iterator tests"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - // create a new ref counted object with an implicit reference HttpHeaders::ptr_t headers = HttpHeaders::ptr_t(new HttpHeaders()); @@ -337,9 +306,6 @@ void HttpHeadersTestObjectType::test<5>() // release the implicit reference, causing the object to be released headers.reset(); - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } // Reverse iterators find everything as expected @@ -348,9 +314,6 @@ void HttpHeadersTestObjectType::test<6>() { set_test_name("HttpHeaders reverse iterator tests"); - // record the total amount of dynamically allocated memory - mMemTotal = GetMemTotal(); - // create a new ref counted object with an implicit reference HttpHeaders::ptr_t headers = HttpHeaders::ptr_t(new HttpHeaders()); @@ -421,9 +384,6 @@ void HttpHeadersTestObjectType::test<6>() // release the implicit reference, causing the object to be released headers.reset(); - - // make sure we didn't leak any memory - ensure(mMemTotal == GetMemTotal()); } } // end namespace tut -- cgit v1.2.3