From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 73952 invoked by alias); 10 Dec 2015 22:03:29 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 73937 invoked by uid 89); 10 Dec 2015 22:03:28 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.6 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS,T_RP_MATCHES_RCVD autolearn=ham version=3.3.2 X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Thu, 10 Dec 2015 22:03:27 +0000 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id C05BE345A81; Thu, 10 Dec 2015 22:03:25 +0000 (UTC) Received: from [10.10.116.30] (ovpn-116-30.rdu2.redhat.com [10.10.116.30]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id tBAM3NXu022726; Thu, 10 Dec 2015 17:03:23 -0500 To: gcc-patches List , Jeffrey A Law From: Jason Merrill Subject: RFA (hash-*): PATCH for c++/68309 Cc: Richard Sandiford , Trevor Saunders Message-ID: <5669F6AA.2000606@redhat.com> Date: Thu, 10 Dec 2015 22:03:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="------------080700060009020903090509" X-SW-Source: 2015-12/txt/msg01186.txt.bz2 This is a multi-part message in MIME format. --------------080700060009020903090509 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-length: 641 The C++ front end uses a temporary hash table to remember specializations of local variables during template instantiations. In a nested function such as a lambda or local class member function, we need to retain the elements from the enclosing function's local_specializations table; otherwise the testcase crashes because we don't find a local specialization for the non-captured use of 'args' in the decltype. This patch addresses that by making a copy of the enclosing local_specializations table if it exists; to enable that I've added copy constructors to hash_table and hash_map. Tested x86_64-pc-linux-gnu. OK for trunk? --------------080700060009020903090509 Content-Type: text/x-patch; name="68309.patch" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="68309.patch" Content-length: 3811 commit 2dfc74fa638b7255658f194c82308e8bf8ada9f9 Author: Jason Merrill Date: Thu Dec 10 15:37:50 2015 -0500 PR c++/68309 gcc/ * hash-table.h: Add copy constructor. * hash-map.h: Add copy constructor. gcc/cp/ * pt.c (instantiate_decl): Copy local_specializations for nested function. diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index 0e087a6..5db3a32 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -21725,8 +21725,13 @@ instantiate_decl (tree d, int defer_ok, template from within the body of another. */ saved_local_specializations = local_specializations; - /* Set up the list of local specializations. */ - local_specializations = new hash_map; + /* Set up the list of local specializations, copying the current + list if there is one. */ + if (local_specializations) + local_specializations + = new hash_map (*local_specializations); + else + local_specializations = new hash_map; /* Set up context. */ if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern) diff --git a/gcc/hash-map.h b/gcc/hash-map.h index b83708c..9b3d1e9 100644 --- a/gcc/hash-map.h +++ b/gcc/hash-map.h @@ -110,6 +110,11 @@ public: bool gather_mem_stats = true CXX_MEM_STAT_INFO) : m_table (n, ggc, gather_mem_stats, HASH_MAP_ORIGIN PASS_MEM_STAT) {} + hash_map (const hash_map &h, bool ggc = false, + bool gather_mem_stats = true CXX_MEM_STAT_INFO) + : m_table (h.m_table, ggc, gather_mem_stats, + HASH_MAP_ORIGIN PASS_MEM_STAT) {} + /* Create a hash_map in ggc memory. */ static hash_map *create_ggc (size_t size, bool gather_mem_stats = true CXX_MEM_STAT_INFO) diff --git a/gcc/hash-table.h b/gcc/hash-table.h index 192be30..d172841 100644 --- a/gcc/hash-table.h +++ b/gcc/hash-table.h @@ -364,6 +364,10 @@ public: explicit hash_table (size_t, bool ggc = false, bool gather_mem_stats = true, mem_alloc_origin origin = HASH_TABLE_ORIGIN CXX_MEM_STAT_INFO); + hash_table (const hash_table &, bool ggc = false, + bool gather_mem_stats = true, + mem_alloc_origin origin = HASH_TABLE_ORIGIN + CXX_MEM_STAT_INFO); ~hash_table (); /* Create a hash_table in gc memory. */ @@ -580,6 +584,27 @@ hash_table::hash_table (size_t size, bool ggc, bool } template class Allocator> +hash_table::hash_table (const hash_table &h, bool ggc, + bool gather_mem_stats, + mem_alloc_origin origin + MEM_STAT_DECL) : + m_n_elements (h.m_n_elements), m_n_deleted (h.m_n_deleted), + m_searches (0), m_collisions (0), + m_ggc (ggc), m_gather_mem_stats (gather_mem_stats) +{ + size_t size = h.m_size; + + if (m_gather_mem_stats) + hash_table_usage.register_descriptor (this, origin, ggc + FINAL_PASS_MEM_STAT); + + m_entries = alloc_entries (size PASS_MEM_STAT); + memcpy (m_entries, h.m_entries, size * sizeof (value_type)); + m_size = size; + m_size_prime_index = h.m_size_prime_index; +} + +template class Allocator> hash_table::~hash_table () { for (size_t i = m_size - 1; i < m_size; i--) diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-variadic3.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-variadic3.C new file mode 100644 index 0000000..76b6b3f --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-variadic3.C @@ -0,0 +1,9 @@ +// PR c++/68309 +// { dg-do compile { target c++11 } } + +template void f(Ts...); +template T g(T); +template void print(Ts... args) { + [&] { f(g(args)...); }(); +} +int main() { print(5.2); } --------------080700060009020903090509--