From 64f59be62fcf55e6d0e7019ee61c712196c6914f Mon Sep 17 00:00:00 2001 From: Ben Noordhuis Date: Thu, 17 Aug 2017 14:57:35 +0200 Subject: [PATCH] deps: cherry-pick e020aae394 from V8 upstream MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Original commit message: Work around glibc thread-local storage bug glibc before 2.17 has a bug that makes it impossible to execute binaries that have single-byte thread-local variables: % node --version node: error while loading shared libraries: cannot allocate memory in static TLS block Work around that by making the one instance in the V8 code base an int. See: https://sourceware.org/bugzilla/show_bug.cgi?id=14898 See: https://github.com/nodesource/distributions/issues/513 See: https://github.com/nodejs/build/pull/809 Change-Id: Iefd8009100cd93e26cf8dc5dc03f2d622b423385 Reviewed-on: https://chromium-review.googlesource.com/612351 Commit-Queue: Ben Noordhuis Reviewed-by: Eric Holk Cr-Commit-Position: refs/heads/master@{#47400} PR-URL: https://github.com/nodejs/node/pull/14913 Ref: https://github.com/nodejs/build/pull/809 Reviewed-By: Ben Noordhuis Reviewed-By: Michaël Zasso Reviewed-By: Nikolai Vavilov Reviewed-By: Colin Ihrig Reviewed-By: Michael Dawson Reviewed-By: James M Snell --- deps/v8/src/trap-handler/handler-shared.cc | 9 ++++++++- deps/v8/src/trap-handler/trap-handler.h | 2 +- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/deps/v8/src/trap-handler/handler-shared.cc b/deps/v8/src/trap-handler/handler-shared.cc index 7b399f5eeac1be..d1b549a1701900 100644 --- a/deps/v8/src/trap-handler/handler-shared.cc +++ b/deps/v8/src/trap-handler/handler-shared.cc @@ -23,7 +23,14 @@ namespace v8 { namespace internal { namespace trap_handler { -THREAD_LOCAL bool g_thread_in_wasm_code = false; +// We declare this as int rather than bool as a workaround for a glibc bug, in +// which the dynamic loader cannot handle executables whose TLS area is only +// 1 byte in size; see https://sourceware.org/bugzilla/show_bug.cgi?id=14898. +THREAD_LOCAL int g_thread_in_wasm_code = false; + +static_assert(sizeof(g_thread_in_wasm_code) > 1, + "sizeof(thread_local_var) must be > 1, see " + "https://sourceware.org/bugzilla/show_bug.cgi?id=14898"); size_t gNumCodeObjects = 0; CodeProtectionInfoListEntry* gCodeObjects = nullptr; diff --git a/deps/v8/src/trap-handler/trap-handler.h b/deps/v8/src/trap-handler/trap-handler.h index 5494c5fdb312f3..ed9459918b7b36 100644 --- a/deps/v8/src/trap-handler/trap-handler.h +++ b/deps/v8/src/trap-handler/trap-handler.h @@ -65,7 +65,7 @@ inline bool UseTrapHandler() { return FLAG_wasm_trap_handler && V8_TRAP_HANDLER_SUPPORTED; } -extern THREAD_LOCAL bool g_thread_in_wasm_code; +extern THREAD_LOCAL int g_thread_in_wasm_code; inline bool IsThreadInWasm() { return g_thread_in_wasm_code; }