Merge autoland to mozilla-central. a=merge

build/build-clang/clang-7.0.json

@@ -1,5 +0,0 @@
-{
-    "cc": "/usr/bin/gcc",
-    "cxx": "/usr/bin/g++",
-    "as": "/usr/bin/gcc"
-}

build/build-clang/clang-8.0.json

@@ -0,0 +1,9 @@
+{
+    "cc": "/usr/bin/gcc",
+    "cxx": "/usr/bin/g++",
+    "as": "/usr/bin/gcc",
+    "targets": "X86;WebAssembly",
+    "patches": [
+        "llvmorg-10-init-136-gb288d90b39f4.patch"
+    ]
+}

build/build-clang/llvmorg-10-init-136-gb288d90b39f4.patch

@@ -0,0 +1,37 @@
+From 79e6696d121b978b4482ce74119c6bbc7a9ce30f Mon Sep 17 00:00:00 2001
+From: Than McIntosh <thanm@google.com>
+Date: Fri, 19 Jul 2019 13:13:54 +0000
+Subject: [PATCH] [NFC] include cstdint/string prior to using uint8_t/string
+
+Summary: include proper header prior to use of uint8_t typedef
+and std::string.
+
+Subscribers: llvm-commits
+
+Reviewers: cherry
+
+Tags: #llvm
+
+Differential Revision: https://reviews.llvm.org/D64937
+
+llvm-svn: 366572
+---
+ llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h b/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h
+index 9e3478e9fd29..efd55339418b 100644
+--- a/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h
++++ b/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h
+@@ -4,6 +4,8 @@
+ #include "llvm/Demangle/Compiler.h"
+ #include "llvm/Demangle/StringView.h"
+ #include <array>
++#include <cstdint>
++#include <string>
+ 
+ class OutputStream;
+ 
+-- 
+2.41.0.3.g1cb8d410ac
+

build/moz.configure/toolchain.configure

@@ -1414,9 +1414,9 @@ def compiler(
 
         # If you want to bump the version check here ensure the version
         # is known for Xcode in get_compiler_info.
-        if info.type == "clang" and info.version < "7.0":
+        if info.type == "clang" and info.version < "8.0":
             raise FatalCheckError(
-                "Only clang/llvm 7.0 or newer is supported (found version %s)."
+                "Only clang/llvm 8.0 or newer is supported (found version %s)."
                 % info.version
             )
 

build/unix/elfhack/Makefile.in

@@ -16,7 +16,7 @@ test-array$(DLL_SUFFIX) test-ctors$(DLL_SUFFIX): %$(DLL_SUFFIX): %.$(OBJ_SUFFIX)
 	@echo === Use --disable-elf-hack until this is fixed.
 	@echo ===
 	# Fail if the library doesn't have $(DT_TYPE) .dynamic info
-	$(READELF) -d $@ | grep '($(DT_TYPE))'
+	$(READELF) -d $@ | grep '\b$(DT_TYPE)\b'
 	@rm -f $@.bak
 	$(CURDIR)/elfhack -b -f $@
 	# Fail if the backup file doesn't exist

build/unix/elfhack/relrhack.cpp

@@ -180,6 +180,12 @@ bool RelR<bits>::hack(std::fstream& f) {
     return false;
   }
 
+  // Apply the PT_DYNAMIC tag changes we've recorded.
+  for (const auto& [offset, tag] : relr_tags) {
+    f.seekg(offset, std::ios::beg);
+    f.write(reinterpret_cast<const char*>(&tag), sizeof(tag));
+  }
+
   if (verneednum && verneed_off && strsz && strtab_off) {
     // Scan SHT_VERNEED for the GLIBC_ABI_DT_RELR version on the libc
     // library.
@@ -220,10 +226,6 @@ bool RelR<bits>::hack(std::fstream& f) {
           // Don't overwrite vn_aux.
           f.write(reinterpret_cast<char*>(&reuse),
                   sizeof(reuse) - sizeof(Elf_Word));
-          for (const auto& [offset, tag] : relr_tags) {
-            f.seekg(offset, std::ios::beg);
-            f.write(reinterpret_cast<const char*>(&tag), sizeof(tag));
-          }
         }
       }
       verneed_off += verneed.vn_next;

docs/code-quality/coding-style/using_cxx_in_firefox_code.rst

@@ -44,7 +44,7 @@ list of acceptable features is given below:
      -
    * - Current minimal requirement
      - 8.1
-     - 7.0
+     - 8.0
      -
    * - Feature
      - GCC

dom/media/webaudio/AudioEventTimeline.cpp

@@ -94,22 +94,57 @@ AudioTimelineEvent::~AudioTimelineEvent() {
   }
 }
 
+template <class TimeType>
+float AudioEventTimeline::ComputeSetTargetStartValue(
+    const AudioTimelineEvent* aPreviousEvent, TimeType aTime) {
+  mSetTargetStartTime = aTime;
+  mSetTargetStartValue =
+      GetValuesAtTimeHelperInternal(aTime, aPreviousEvent, nullptr);
+  return mSetTargetStartValue;
+}
+
 template void AudioEventTimeline::CleanupEventsOlderThan(double);
 template void AudioEventTimeline::CleanupEventsOlderThan(int64_t);
 template <class TimeType>
 void AudioEventTimeline::CleanupEventsOlderThan(TimeType aTime) {
-  while (mEvents.Length() > 1 && aTime > mEvents[1].Time<TimeType>()) {
-    if (mEvents[1].mType == AudioTimelineEvent::SetTarget) {
-      mSetTargetStartValue = GetValuesAtTimeHelperInternal(
-          mEvents[1].Time<TimeType>(), &mEvents[0], nullptr);
-    }
+  auto TimeOf =
+      [](const decltype(mEvents)::const_iterator& aEvent) -> TimeType {
+    return aEvent->Time<TimeType>();
+  };
 
-    MOZ_ASSERT(!mEvents[0].mTrack,
+  // Find first event to keep.  Keep one event prior to aTime.
+  auto begin = mEvents.cbegin();
+  auto end = mEvents.cend();
+  auto event = begin + 1;
+  for (; event < end && aTime > TimeOf(event); ++event) {
+    MOZ_ASSERT(!(event - 1)->mTrack,
                "AudioParam tracks should never be destroyed on the real-time "
                "thread.");
-    JS::AutoSuppressGCAnalysis suppress;
-    mEvents.RemoveElementAt(0);
   }
+  auto firstToKeep = event - 1;
+  if (firstToKeep == begin) {
+    return;
+  }
+
+  // If the firstToKeep event is a SetTarget, then set its initial value if
+  // not already set.  First find the most recent event where the value at the
+  // end time of the event is known, either from the event or for SetTarget
+  // events because it has already been calculated.  This may not have been
+  // calculated if GetValuesAtTime() was not called for the start time of the
+  // SetTarget event.
+  for (event = firstToKeep;
+       event > begin && event->mType == AudioTimelineEvent::SetTarget &&
+       TimeOf(event) > mSetTargetStartTime.Get<TimeType>();
+       --event) {
+  }
+  // Compute SetTarget start times.
+  for (; event < firstToKeep; ++event) {
+    MOZ_ASSERT((event + 1)->mType == AudioTimelineEvent::SetTarget);
+    ComputeSetTargetStartValue(&*event, TimeOf(event + 1));
+  }
+
+  JS::AutoSuppressGCAnalysis suppress;  // for null mTrack
+  mEvents.RemoveElementsRange(begin, firstToKeep);
 }
 
 // This method computes the AudioParam value at a given time based on the event
@@ -184,9 +219,7 @@ float AudioEventTimeline::GetValueAtTimeOfEvent(
   switch (aEvent->mType) {
     case AudioTimelineEvent::SetTarget:
       // Start the curve, from the last value of the previous event.
-      mSetTargetStartValue =
-          GetValuesAtTimeHelperInternal(time, aPrevious, nullptr);
-      return mSetTargetStartValue;
+      return ComputeSetTargetStartValue(aPrevious, time);
     case AudioTimelineEvent::SetValueCurve:
       // SetValueCurve events can be handled no matter what their event
       // node is (if they have one)

dom/media/webaudio/AudioEventTimeline.h

@@ -403,6 +403,10 @@ class AudioEventTimeline {
 
   static bool IsValid(double value) { return std::isfinite(value); }
 
+  template <class TimeType>
+  float ComputeSetTargetStartValue(const AudioTimelineEvent* aPreviousEvent,
+                                   TimeType aTime);
+
   // This is a sorted array of the events in the timeline.  Queries of this
   // data structure should probably be more frequent than modifications to it,
   // and that is the reason why we're using a simple array as the data
@@ -413,6 +417,7 @@ class AudioEventTimeline {
   // This is the value of this AudioParam at the end of the previous
   // event for SetTarget curves.
   float mSetTargetStartValue;
+  AudioTimelineEvent::TimeUnion mSetTargetStartTime;
 };
 
 }  // namespace dom

ipc/chromium/moz.build

@@ -102,6 +102,7 @@ if os_bsd:
 if os_linux:
     SOURCES += [
         "src/base/process_util_linux.cc",
+        "src/base/set_process_title_linux.cc",
         "src/base/time_posix.cc",
     ]
     if CONFIG["OS_TARGET"] == "Android":

ipc/chromium/src/base/process_util_linux.cc

@@ -27,6 +27,7 @@
 #  include "mozilla/Unused.h"
 #  include "mozilla/ScopeExit.h"
 #  include "mozilla/ipc/ProcessUtils.h"
+#  include "mozilla/ipc/SetProcessTitle.h"
 
 using namespace mozilla::ipc;
 #endif
@@ -142,6 +143,7 @@ void AppProcessBuilder::ReplaceArguments(int* argcp, char*** argvp) {
   *p = nullptr;
   *argvp = argv;
   *argcp = argv_.size();
+  mozilla::SetProcessTitle(argv_);
 }
 
 void AppProcessBuilder::InitAppProcess(int* argcp, char*** argvp) {

ipc/chromium/src/base/set_process_title_linux.cc

@@ -0,0 +1,206 @@
+// Copyright 2009 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This file implements BSD-style setproctitle() for Linux.
+// It is written such that it can easily be compiled outside Chromium.
+//
+// (This copy has been modified for use in the Mozilla codebase.)
+//
+// The Linux kernel sets up two locations in memory to pass arguments and
+// environment variables to processes. First, there are two char* arrays stored
+// one after another: argv and environ. A pointer to argv is passed to main(),
+// while glibc sets the global variable |environ| to point at the latter. Both
+// of these arrays are terminated by a null pointer; the environment array is
+// also followed by some empty space to allow additional variables to be added.
+//
+// These arrays contain pointers to a second location in memory, where the
+// strings themselves are stored one after another: first all the arguments,
+// then the environment variables.
+//
+// When the kernel reads the command line arguments for a process, it looks at
+// the range of memory that it initially used for the argument list. If the
+// terminating '\0' character is still where it expects, nothing further is
+// done. If it has been overwritten, the kernel will scan up to the size of
+// a page looking for another.
+//
+// Thus to change the process title, we must move any arguments and environment
+// variables out of the way to make room for a potentially longer title, and
+// then overwrite the memory pointed to by argv[0] with a single replacement
+// string, making sure its size does not exceed the available space.
+//
+// See the following kernel commit for the details of the contract between
+// kernel and setproctitle:
+// https://github.com/torvalds/linux/commit/2954152298c37804dab49d630aa959625b50cf64
+//
+// It is perhaps worth noting that patches to add a system call to Linux for
+// this, like in BSD, have never made it in: this is the "official" way to do
+// this on Linux. Presumably it is not in glibc due to some disagreement over
+// this position within the glibc project, leaving applications caught in the
+// middle. (Also, only a very few applications need or want this anyway.)
+
+#include "base/set_process_title_linux.h"
+
+#include "mozilla/UniquePtrExtensions.h"
+
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <string>
+#include <vector>
+
+extern char** environ;
+
+// g_orig_argv0 is the original process name found in argv[0].
+// It is set to a copy of argv[0] in setproctitle_init. It is nullptr if
+// setproctitle_init was unsuccessful or not called.
+static const char* g_orig_argv0 = nullptr;
+
+// Following pointers hold the initial argv/envp memory range.
+// They are initialized in setproctitle_init and are used to overwrite the
+// argv/envp memory range with a new process title to be read by the kernel.
+// They are nullptr if setproctitle_init was unsuccessful or not called.
+// Note that g_envp_start is not necessary because it is the same as g_argv_end.
+static char* g_argv_start = nullptr;
+static char* g_argv_end = nullptr;
+static char* g_envp_end = nullptr;
+
+void setproctitle(const char* fmt, ...) {
+  va_list ap;
+
+  // Sanity check before we try and set the process title.
+  // The BSD version allows a null fmt to restore the original title.
+  if (!g_orig_argv0 || !fmt) {
+    return;
+  }
+
+  // The title can be up to the end of envp.
+  const size_t avail_size = g_envp_end - g_argv_start - 1;
+
+  // Linux 4.18--5.2 have a bug where we can never set a process title
+  // shorter than the initial argv. Check if the bug exists in the current
+  // kernel on the first call of setproctitle.
+  static const bool buggy_kernel = [avail_size]() {
+    // Attempt to set an empty title. This will set cmdline to:
+    // ""                   (on Linux --4.17)
+    // "\0\0\0...\0\0\0.\0" (on Linux 4.18--5.2)
+    // "\0"                 (on Linux 5.3--)
+    memset(g_argv_start, 0, avail_size + 1);
+    g_argv_end[-1] = '.';
+
+    mozilla::UniqueFileHandle fd(
+        open("/proc/self/cmdline", O_RDONLY | O_CLOEXEC));
+    if (!fd) {
+      return false;
+    }
+
+    // We just want to see if there are at least 2 bytes in the file;
+    // we don't need to read the whole contents.  Short reads probably
+    // aren't possible given how this procfs node is implemented, but
+    // it's not much more code to handle it anyway.
+    char buf[2];
+    ssize_t total_read = 0;
+    while (total_read < 2) {
+      ssize_t rd = read(fd.get(), buf, 2);
+      if (rd <= 0) {
+        return false;
+      }
+      total_read += rd;
+    }
+    return true;
+  }();
+
+  memset(g_argv_start, 0, avail_size + 1);
+
+  size_t size;
+  va_start(ap, fmt);
+  if (fmt[0] == '-') {
+    size = vsnprintf(g_argv_start, avail_size, &fmt[1], ap);
+  } else {
+    size = snprintf(g_argv_start, avail_size, "%s ", g_orig_argv0);
+    if (size < avail_size) {
+      size += vsnprintf(&g_argv_start[size], avail_size - size, fmt, ap);
+    }
+  }
+  va_end(ap);
+
+  // Kernel looks for a null terminator instead of the initial argv space
+  // when the end of the space is not terminated with a null.
+  // https://github.com/torvalds/linux/commit/d26d0cd97c88eb1a5704b42e41ab443406807810
+  //
+  // If the length of the new title is shorter than the original argv space,
+  // set the last byte of the space to an arbitrary non-null character to tell
+  // the kernel that setproctitle was called.
+  //
+  // On buggy kernels we can never make the process title shorter than the
+  // initial argv. In that case, just leave the remaining bytes filled with
+  // null characters.
+  const size_t argv_size = g_argv_end - g_argv_start - 1;
+  if (!buggy_kernel && size < argv_size) {
+    g_argv_end[-1] = '.';
+  }
+}
+
+// A version of this built into glibc would not need this function, since
+// it could stash the argv pointer in __libc_start_main(). But we need it.
+void setproctitle_init(char** main_argv) {
+  static bool init_called = false;
+  if (init_called) {
+    return;
+  }
+  init_called = true;
+
+  if (!main_argv) {
+    return;
+  }
+
+  // Verify that the memory layout matches expectation.
+  char** const argv = main_argv;
+  char* argv_start = argv[0];
+  char* p = argv_start;
+  for (size_t i = 0; argv[i]; ++i) {
+    if (p != argv[i]) {
+      return;
+    }
+    p += strlen(p) + 1;
+  }
+  char* argv_end = p;
+  size_t environ_size = 0;
+  for (size_t i = 0; environ[i]; ++i, ++environ_size) {
+    if (p != environ[i]) {
+      return;
+    }
+    p += strlen(p) + 1;
+  }
+  char* envp_end = p;
+
+  // Copy the arg and env strings into the heap.  Leak Sanitizer
+  // doesn't seem to object to these strdup()s; if it ever does, we
+  // can always ensure the pointers are reachable from globals or add
+  // a suppresion for this function.
+  //
+  // Note that Chromium's version of this code didn't copy the
+  // arguments; this is probably because they access args via the
+  // CommandLine class, which copies into a std::vector<std::string>,
+  // but in general that's not a safe assumption for Gecko.
+  for (size_t i = 0; argv[i]; ++i) {
+    argv[i] = strdup(argv[i]);
+  }
+  for (size_t i = 0; environ[i]; ++i) {
+    environ[i] = strdup(environ[i]);
+  }
+
+  if (!argv[0]) {
+    return;
+  }
+
+  g_orig_argv0 = argv[0];
+  g_argv_start = argv_start;
+  g_argv_end = argv_end;
+  g_envp_end = envp_end;
+}

ipc/chromium/src/base/set_process_title_linux.h

@@ -0,0 +1,12 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef BASE_PROCESS_TITLE_LINUX_H_
+#define BASE_PROCESS_TITLE_LINUX_H_
+
+void setproctitle(const char* fmt, ...);
+void setproctitle_init(char** main_argv);
+
+#endif  // BASE_PROCESS_TITLE_LINUX_H_

ipc/glue/ForkServer.cpp

@@ -14,6 +14,7 @@
 #include "mozilla/ipc/FileDescriptor.h"
 #include "mozilla/ipc/IPDLParamTraits.h"
 #include "mozilla/ipc/ProtocolMessageUtils.h"
+#include "mozilla/ipc/SetProcessTitle.h"
 #include "nsTraceRefcnt.h"
 
 #include <fcntl.h>
@@ -256,6 +257,8 @@ bool ForkServer::RunForkServer(int* aArgc, char*** aArgv) {
   bool sleep_newproc = !!getenv("MOZ_FORKSERVER_WAIT_GDB_NEWPROC");
 #endif
 
+  SetProcessTitleInit(*aArgv);
+
   // Do this before NS_LogInit() to avoid log files taking lower
   // FDs.
   ForkServer forkserver;

ipc/glue/SetProcessTitle.cpp

@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ipc/SetProcessTitle.h"
+
+#include "nsString.h"
+
+#ifdef XP_LINUX
+
+#  include "base/set_process_title_linux.h"
+#  define HAVE_SETPROCTITLE
+#  define HAVE_SETPROCTITLE_INIT
+
+#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
+    defined(__DragonFly__)
+
+#  include <sys/types.h>
+#  include <unistd.h>
+#  define HAVE_SETPROCTITLE
+
+#endif
+
+namespace mozilla {
+
+void SetProcessTitle(const std::vector<std::string>& aNewArgv) {
+#ifdef HAVE_SETPROCTITLE
+  nsAutoCStringN<1024> buf;
+
+  bool firstArg = true;
+  for (const std::string& arg : aNewArgv) {
+    if (firstArg) {
+      firstArg = false;
+    } else {
+      buf.Append(' ');
+    }
+    buf.Append(arg.c_str());
+  }
+
+  setproctitle("-%s", buf.get());
+#endif
+}
+
+void SetProcessTitleInit(char** aOrigArgv) {
+#ifdef HAVE_SETPROCTITLE_INIT
+  setproctitle_init(aOrigArgv);
+#endif
+}
+
+}  // namespace mozilla

ipc/glue/SetProcessTitle.h

@@ -0,0 +1,19 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ipc_SetProcessTitle_h
+#define mozilla_ipc_SetProcessTitle_h
+
+#include <string>
+#include <vector>
+
+namespace mozilla {
+
+void SetProcessTitle(const std::vector<std::string>& aNewArgv);
+void SetProcessTitleInit(char** aOrigArgv);
+
+}  // namespace mozilla
+
+#endif  // mozilla_ipc_SetProcessTitle_h

ipc/glue/moz.build

@@ -125,9 +125,19 @@ else:
 if CONFIG["OS_ARCH"] == "Linux":
     UNIFIED_SOURCES += [
         "ProcessUtils_linux.cpp",
+        "SetProcessTitle.cpp",
+    ]
+    EXPORTS.mozilla.ipc += [
+        "SetProcessTitle.h",
     ]
 elif CONFIG["OS_ARCH"] in ("DragonFly", "FreeBSD", "NetBSD", "OpenBSD"):
-    UNIFIED_SOURCES += ["ProcessUtils_bsd.cpp"]
+    UNIFIED_SOURCES += [
+        "ProcessUtils_bsd.cpp",
+        "SetProcessTitle.cpp",
+    ]
+    EXPORTS.ipc += [
+        "SetProcessTitle.h",
+    ]
 elif CONFIG["OS_ARCH"] == "Darwin":
     UNIFIED_SOURCES += ["ProcessUtils_mac.mm"]
 else:

old-configure.in

@@ -391,11 +391,7 @@ case "$target" in
 *-*linux*)
     if test "$GNU_CC" -o "$GNU_CXX"; then
         MOZ_PGO_OPTIMIZE_FLAGS="-O3"
-        if test -n "$MOZ_DEBUG"; then
-            MOZ_OPTIMIZE_FLAGS="-Os"
-        else
-            MOZ_OPTIMIZE_FLAGS="-O2"
-        fi
+        MOZ_OPTIMIZE_FLAGS="-O2"
         if test -z "$CLANG_CC"; then
            MOZ_OPTIMIZE_FLAGS="-freorder-blocks $MOZ_OPTIMIZE_FLAGS"
         fi

python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py

@@ -173,8 +173,8 @@ CLANG_3_3 = CLANG("3.3.0") + DEFAULT_C99
 CLANGXX_3_3 = CLANGXX("3.3.0")
 CLANG_4_0 = CLANG("4.0.2") + DEFAULT_C11
 CLANGXX_4_0 = CLANGXX("4.0.2") + SUPPORTS_GNUXX1Z
-CLANG_7_0 = CLANG("7.0.0") + DEFAULT_C11
-CLANGXX_7_0 = CLANGXX("7.0.0") + DEFAULT_CXX_14 + SUPPORTS_GNUXX17
+CLANG_8_0 = CLANG("8.0.0") + DEFAULT_C11
+CLANGXX_8_0 = CLANGXX("8.0.0") + DEFAULT_CXX_14 + SUPPORTS_GNUXX17
 XCODE_CLANG_3_3 = (
     CLANG("5.0")
     + DEFAULT_C99
@@ -188,12 +188,12 @@ XCODE_CLANG_4_0 = CLANG("9.0.0") + DEFAULT_C11 + {"__apple_build_version__": "1"
 XCODE_CLANGXX_4_0 = (
     CLANGXX("9.0.0") + SUPPORTS_GNUXX1Z + {"__apple_build_version__": "1"}
 )
-XCODE_CLANG_7_0 = CLANG("10.0.1") + DEFAULT_C11 + {"__apple_build_version__": "1"}
-XCODE_CLANGXX_7_0 = (
-    CLANGXX("10.0.1") + SUPPORTS_GNUXX17 + {"__apple_build_version__": "1"}
+XCODE_CLANG_8_0 = CLANG("11.0.1") + DEFAULT_C11 + {"__apple_build_version__": "1"}
+XCODE_CLANGXX_8_0 = (
+    CLANGXX("11.0.1") + SUPPORTS_GNUXX17 + {"__apple_build_version__": "1"}
 )
-DEFAULT_CLANG = CLANG_7_0
-DEFAULT_CLANGXX = CLANGXX_7_0
+DEFAULT_CLANG = CLANG_8_0
+DEFAULT_CLANGXX = CLANGXX_8_0
 
 
 def CLANG_PLATFORM(gcc_platform):
@@ -445,8 +445,8 @@ class LinuxToolchainTest(BaseToolchainTest):
         "/usr/bin/g++-10": GXX_10 + GCC_PLATFORM_X86_64_LINUX,
         "/usr/bin/clang": DEFAULT_CLANG + CLANG_PLATFORM_X86_64_LINUX,
         "/usr/bin/clang++": DEFAULT_CLANGXX + CLANG_PLATFORM_X86_64_LINUX,
-        "/usr/bin/clang-7.0": CLANG_7_0 + CLANG_PLATFORM_X86_64_LINUX,
-        "/usr/bin/clang++-7.0": CLANGXX_7_0 + CLANG_PLATFORM_X86_64_LINUX,
+        "/usr/bin/clang-8.0": CLANG_8_0 + CLANG_PLATFORM_X86_64_LINUX,
+        "/usr/bin/clang++-8.0": CLANGXX_8_0 + CLANG_PLATFORM_X86_64_LINUX,
         "/usr/bin/clang-4.0": CLANG_4_0 + CLANG_PLATFORM_X86_64_LINUX,
         "/usr/bin/clang++-4.0": CLANGXX_4_0 + CLANG_PLATFORM_X86_64_LINUX,
         "/usr/bin/clang-3.3": CLANG_3_3 + CLANG_PLATFORM_X86_64_LINUX,
@@ -481,33 +481,33 @@ class LinuxToolchainTest(BaseToolchainTest):
     DEFAULT_GXX_RESULT = GXX_8_RESULT + {"compiler": "/usr/bin/g++"}
 
     CLANG_3_3_RESULT = (
-        "Only clang/llvm 7.0 or newer is supported (found version 3.3.0)."
+        "Only clang/llvm 8.0 or newer is supported (found version 3.3.0)."
     )
     CLANGXX_3_3_RESULT = (
-        "Only clang/llvm 7.0 or newer is supported (found version 3.3.0)."
+        "Only clang/llvm 8.0 or newer is supported (found version 3.3.0)."
     )
     CLANG_4_0_RESULT = (
-        "Only clang/llvm 7.0 or newer is supported (found version 4.0.2)."
+        "Only clang/llvm 8.0 or newer is supported (found version 4.0.2)."
     )
     CLANGXX_4_0_RESULT = (
-        "Only clang/llvm 7.0 or newer is supported (found version 4.0.2)."
+        "Only clang/llvm 8.0 or newer is supported (found version 4.0.2)."
     )
-    CLANG_7_0_RESULT = CompilerResult(
+    CLANG_8_0_RESULT = CompilerResult(
         flags=["-std=gnu99"],
-        version="7.0.0",
+        version="8.0.0",
         type="clang",
-        compiler="/usr/bin/clang-7.0",
+        compiler="/usr/bin/clang-8.0",
         language="C",
     )
-    CLANGXX_7_0_RESULT = CompilerResult(
+    CLANGXX_8_0_RESULT = CompilerResult(
         flags=["-std=gnu++17"],
-        version="7.0.0",
+        version="8.0.0",
         type="clang",
-        compiler="/usr/bin/clang++-7.0",
+        compiler="/usr/bin/clang++-8.0",
         language="C++",
     )
-    DEFAULT_CLANG_RESULT = CLANG_7_0_RESULT + {"compiler": "/usr/bin/clang"}
-    DEFAULT_CLANGXX_RESULT = CLANGXX_7_0_RESULT + {"compiler": "/usr/bin/clang++"}
+    DEFAULT_CLANG_RESULT = CLANG_8_0_RESULT + {"compiler": "/usr/bin/clang"}
+    DEFAULT_CLANGXX_RESULT = CLANGXX_8_0_RESULT + {"compiler": "/usr/bin/clang++"}
 
     def test_default(self):
         # We'll try clang and gcc, and find clang first.
@@ -657,10 +657,10 @@ class LinuxToolchainTest(BaseToolchainTest):
         self.do_toolchain_test(
             self.PATHS,
             {
-                "c_compiler": self.CLANG_7_0_RESULT,
-                "cxx_compiler": self.CLANGXX_7_0_RESULT,
+                "c_compiler": self.CLANG_8_0_RESULT,
+                "cxx_compiler": self.CLANGXX_8_0_RESULT,
             },
-            environ={"CC": "clang-7.0"},
+            environ={"CC": "clang-8.0"},
         )
 
     def test_unsupported_clang(self):
@@ -845,8 +845,8 @@ class OSXToolchainTest(BaseToolchainTest):
         "/usr/bin/g++-5": GXX_5 + GCC_PLATFORM_X86_64_OSX,
         "/usr/bin/gcc-8": GCC_8 + GCC_PLATFORM_X86_64_OSX,
         "/usr/bin/g++-8": GXX_8 + GCC_PLATFORM_X86_64_OSX,
-        "/usr/bin/clang": XCODE_CLANG_7_0 + CLANG_PLATFORM_X86_64_OSX,
-        "/usr/bin/clang++": XCODE_CLANGXX_7_0 + CLANG_PLATFORM_X86_64_OSX,
+        "/usr/bin/clang": XCODE_CLANG_8_0 + CLANG_PLATFORM_X86_64_OSX,
+        "/usr/bin/clang++": XCODE_CLANGXX_8_0 + CLANG_PLATFORM_X86_64_OSX,
         "/usr/bin/clang-4.0": XCODE_CLANG_4_0 + CLANG_PLATFORM_X86_64_OSX,
         "/usr/bin/clang++-4.0": XCODE_CLANGXX_4_0 + CLANG_PLATFORM_X86_64_OSX,
         "/usr/bin/clang-3.3": XCODE_CLANG_3_3 + CLANG_PLATFORM_X86_64_OSX,
@@ -854,27 +854,27 @@ class OSXToolchainTest(BaseToolchainTest):
         "/usr/bin/xcrun": xcrun,
     }
     CLANG_3_3_RESULT = (
-        "Only clang/llvm 7.0 or newer is supported (found version 4.0.0.or.less)."
+        "Only clang/llvm 8.0 or newer is supported (found version 4.0.0.or.less)."
     )
     CLANGXX_3_3_RESULT = (
-        "Only clang/llvm 7.0 or newer is supported (found version 4.0.0.or.less)."
+        "Only clang/llvm 8.0 or newer is supported (found version 4.0.0.or.less)."
     )
     CLANG_4_0_RESULT = (
-        "Only clang/llvm 7.0 or newer is supported (found version 4.0.0.or.less)."
+        "Only clang/llvm 8.0 or newer is supported (found version 4.0.0.or.less)."
     )
     CLANGXX_4_0_RESULT = (
-        "Only clang/llvm 7.0 or newer is supported (found version 4.0.0.or.less)."
+        "Only clang/llvm 8.0 or newer is supported (found version 4.0.0.or.less)."
     )
     DEFAULT_CLANG_RESULT = CompilerResult(
         flags=["-std=gnu99"],
-        version="7.0.0",
+        version="8.0.0",
         type="clang",
         compiler="/usr/bin/clang",
         language="C",
     )
     DEFAULT_CLANGXX_RESULT = CompilerResult(
         flags=["-stdlib=libc++", "-std=gnu++17"],
-        version="7.0.0",
+        version="8.0.0",
         type="clang",
         compiler="/usr/bin/clang++",
         language="C++",
@@ -973,8 +973,8 @@ class MingwToolchainTest(BaseToolchainTest):
         "/usr/bin/g++-7": GXX_7 + GCC_PLATFORM_X86_WIN + MINGW32,
         "/usr/bin/clang": DEFAULT_CLANG + CLANG_PLATFORM_X86_WIN,
         "/usr/bin/clang++": DEFAULT_CLANGXX + CLANG_PLATFORM_X86_WIN,
-        "/usr/bin/clang-7.0": CLANG_7_0 + CLANG_PLATFORM_X86_WIN,
-        "/usr/bin/clang++-7.0": CLANGXX_7_0 + CLANG_PLATFORM_X86_WIN,
+        "/usr/bin/clang-8.0": CLANG_8_0 + CLANG_PLATFORM_X86_WIN,
+        "/usr/bin/clang++-8.0": CLANGXX_8_0 + CLANG_PLATFORM_X86_WIN,
         "/usr/bin/clang-4.0": CLANG_4_0 + CLANG_PLATFORM_X86_WIN,
         "/usr/bin/clang++-4.0": CLANGXX_4_0 + CLANG_PLATFORM_X86_WIN,
         "/usr/bin/clang-3.3": CLANG_3_3 + CLANG_PLATFORM_X86_WIN,
@@ -1111,8 +1111,8 @@ class Mingw64ToolchainTest(MingwToolchainTest):
         "/usr/bin/g++-7": GXX_7 + GCC_PLATFORM_X86_64_WIN + MINGW32,
         "/usr/bin/clang": DEFAULT_CLANG + CLANG_PLATFORM_X86_64_WIN,
         "/usr/bin/clang++": DEFAULT_CLANGXX + CLANG_PLATFORM_X86_64_WIN,
-        "/usr/bin/clang-7.0": CLANG_7_0 + CLANG_PLATFORM_X86_64_WIN,
-        "/usr/bin/clang++-7.0": CLANGXX_7_0 + CLANG_PLATFORM_X86_64_WIN,
+        "/usr/bin/clang-8.0": CLANG_8_0 + CLANG_PLATFORM_X86_64_WIN,
+        "/usr/bin/clang++-8.0": CLANGXX_8_0 + CLANG_PLATFORM_X86_64_WIN,
         "/usr/bin/clang-4.0": CLANG_4_0 + CLANG_PLATFORM_X86_64_WIN,
         "/usr/bin/clang++-4.0": CLANGXX_4_0 + CLANG_PLATFORM_X86_64_WIN,
         "/usr/bin/clang-3.3": CLANG_3_3 + CLANG_PLATFORM_X86_64_WIN,
@@ -1561,20 +1561,20 @@ class OSXCrossToolchainTest(BaseToolchainTest):
     PATHS = dict(LinuxToolchainTest.PATHS)
     PATHS.update(
         {
-            "/usr/bin/clang": CLANG_7_0 + CLANG_PLATFORM_X86_64_LINUX,
-            "/usr/bin/clang++": CLANGXX_7_0 + CLANG_PLATFORM_X86_64_LINUX,
+            "/usr/bin/clang": CLANG_8_0 + CLANG_PLATFORM_X86_64_LINUX,
+            "/usr/bin/clang++": CLANGXX_8_0 + CLANG_PLATFORM_X86_64_LINUX,
         }
     )
     DEFAULT_CLANG_RESULT = CompilerResult(
         flags=["-std=gnu99"],
-        version="7.0.0",
+        version="8.0.0",
         type="clang",
         compiler="/usr/bin/clang",
         language="C",
     )
     DEFAULT_CLANGXX_RESULT = CompilerResult(
         flags=["-std=gnu++17"],
-        version="7.0.0",
+        version="8.0.0",
         type="clang",
         compiler="/usr/bin/clang++",
         language="C++",

taskcluster/ci/fetch/toolchains.yml

@@ -340,12 +340,12 @@ android-ndk-rs:
         repo: https://github.com/jamienicol/android-ndk-rs
         revision: 595f4e14a78371e3ab59b12f7bd8131f2ec5b4a1
 
-clang-7.0:
-    description: clang 7.0.0 source code
+clang-8.0:
+    description: clang 8.0.0 source code
     fetch:
         type: git
         repo: https://github.com/llvm/llvm-project
-        revision: 00b161b8971bc6d3cb55f13502288b8fe0dbaa42
+        revision: d2298e74235598f15594fe2c99bbac870a507c59
 
 clang-14:
     description: clang 14.0.5 source code
@@ -388,6 +388,13 @@ rust-1.72.1:
         repo: https://github.com/rust-lang/rust/
         revision: d5c2e9c342b358556da91d61ed4133f6f50fc0c3
 
+wasi-sdk-11:
+    description: wasi-sdk-11 source code
+    fetch:
+        type: git
+        repo: https://github.com/WebAssembly/wasi-sdk
+        revision: ceabbfe181599bca83d81e087a229797e472c09c
+
 wasi-sdk:
     description: wasi-sdk-20 source code
     fetch:

taskcluster/ci/toolchain/clang.yml

@@ -10,29 +10,44 @@ job-defaults:
         resources:
             - 'build/build-clang/build-clang.py'
 
-linux64-clang-7.0:
-    description: "Clang 7.0 toolchain build"
+linux64-clang-8.0-raw:
+    description: "Clang 8.0 toolchain build"
     treeherder:
-        symbol: TL(clang-7.0)
+        symbol: TL(clang-8.0-raw)
     worker-type: b-linux-large-gcp
     run:
         script: build-clang.sh
         arguments:
             - 'build/build-clang/linux64.json'
-            - 'build/build-clang/clang-7.0.json'
+            - 'build/build-clang/clang-8.0.json'
             - 'build/build-clang/2stages.json'
         resources:
             - 'build/build-clang/linux64.json'
-            - 'build/build-clang/clang-7.0.json'
+            - 'build/build-clang/clang-8.0.json'
             - 'build/build-clang/2stages.json'
         toolchain-artifact: public/build/clang.tar.zst
-        toolchain-alias: linux64-clang-base
     fetches:
         fetch:
-            - clang-7.0
+            - clang-8.0
         toolchain:
             - linux64-toolchain-sysroot
 
+linux64-clang-8.0:
+    description: "Clang 8.0 toolchain build"
+    treeherder:
+        symbol: TL(clang-8.0)
+    worker-type: b-linux-gcp
+    worker:
+        max-run-time: 600
+    run:
+        script: repack-clang.sh
+        toolchain-alias: linux64-clang-base
+        toolchain-artifact: public/build/clang.tar.zst
+    fetches:
+        toolchain:
+            - linux64-clang-8.0-raw
+            - wasm32-wasi-compiler-rt-8.0
+
 linux64-clang-14-stage1:
     description: "Clang 14 toolchain build"
     treeherder:

taskcluster/ci/toolchain/compiler-rt.yml

@@ -10,6 +10,25 @@ job-defaults:
         using: toolchain-script
         script: build-compiler-rt.sh
 
+wasm32-wasi-compiler-rt-8.0:
+    description: "wasm32-wasi Compiler-rt for Clang 8 toolchain build"
+    treeherder:
+        symbol: TL(wasi-crt-8)
+    worker-type: b-linux-xlarge-gcp
+    run:
+        script: build-compiler-rt-wasi.sh
+        arguments:
+            - wasi-sdk-11.patch
+        resources:
+            - taskcluster/scripts/misc/wasi-sdk-11.patch
+        toolchain-artifact: public/build/compiler-rt-wasm32-wasi.tar.zst
+    fetches:
+        fetch:
+            - clang-8.0
+            - wasi-sdk-11
+        toolchain:
+            - linux64-clang-8.0-raw
+
 android-aarch64-compiler-rt-16:
     description: "android aarch64 Compiler-rt for Clang 16 toolchain build"
     treeherder:
@@ -429,6 +448,10 @@ wasm32-wasi-compiler-rt-17:
     worker-type: b-linux-xlarge-gcp
     run:
         script: build-compiler-rt-wasi.sh
+        arguments:
+            - wasi-sdk.patch
+        resources:
+            - taskcluster/scripts/misc/wasi-sdk.patch
         toolchain-artifact: public/build/compiler-rt-wasm32-wasi.tar.zst
     fetches:
         fetch:
@@ -666,6 +689,10 @@ wasm32-wasi-compiler-rt-trunk:
     worker-type: b-linux-xlarge-gcp
     run:
         script: build-compiler-rt-wasi.sh
+        arguments:
+            - wasi-sdk.patch
+        resources:
+            - taskcluster/scripts/misc/wasi-sdk.patch
         toolchain-artifact: public/build/compiler-rt-wasm32-wasi.tar.zst
     fetches:
         fetch:

taskcluster/ci/toolchain/sysroot.yml

@@ -60,6 +60,23 @@ sysroot-x86_64-linux-gnu-x11:
         arguments:
             - amd64
 
+sysroot-wasm32-wasi-clang-8.0:
+    description: "Sysroot for wasi"
+    attributes:
+        local-toolchain: true
+    treeherder:
+        symbol: TL(sysroot-wasi-8)
+    run:
+        script: build-sysroot-wasi.sh
+        toolchain-artifact: public/build/sysroot-wasm32-wasi.tar.zst
+    fetches:
+        fetch:
+            - clang-8.0
+            - wasi-sdk-11
+        toolchain:
+            - linux64-clang-8.0
+            - wasm32-wasi-compiler-rt-8.0
+
 sysroot-wasm32-wasi-clang-16:
     description: "Sysroot for wasi"
     attributes:
@@ -89,6 +106,10 @@ sysroot-wasm32-wasi-clang-17:
         symbol: TL(sysroot-wasi-17)
     run:
         script: build-sysroot-wasi.sh
+        arguments:
+            - wasi-sdk.patch
+        resources:
+            - taskcluster/scripts/misc/wasi-sdk.patch
         toolchain-artifact: public/build/sysroot-wasm32-wasi.tar.zst
     fetches:
         fetch:
@@ -106,6 +127,10 @@ sysroot-wasm32-wasi-clang-trunk:
         symbol: TL(sysroot-wasi-trunk)
     run:
         script: build-sysroot-wasi.sh
+        arguments:
+            - wasi-sdk.patch
+        resources:
+            - taskcluster/scripts/misc/wasi-sdk.patch
         toolchain-alias:
             by-project:
                 toolchains: sysroot-wasm32-wasi

taskcluster/scripts/misc/build-compiler-rt-wasi.sh

@@ -4,7 +4,9 @@ set -x -e -v
 artifact=$(basename $TOOLCHAIN_ARTIFACT)
 dir=${artifact%.tar.*}
 
-patch -d $MOZ_FETCHES_DIR/wasi-sdk -p1 < $(dirname $0)/wasi-sdk.patch
+if [ -n "$1" ]; then
+  patch -d $MOZ_FETCHES_DIR/wasi-sdk -p1 < $(dirname $0)/$1
+fi
 
 cd $MOZ_FETCHES_DIR/wasi-sdk
 LLVM_PROJ_DIR=$MOZ_FETCHES_DIR/llvm-project
@@ -23,7 +25,7 @@ ln -s llvm-ar build/install/wasi/bin/ar
 # Build compiler-rt
 make \
   LLVM_PROJ_DIR=$LLVM_PROJ_DIR \
-  PREFIX=/wasi \
+  PREFIX=$(grep -q BUILD_PREFIX Makefile || echo $PWD/build/install)/wasi \
   build/compiler-rt.BUILT \
   -j$(nproc)
 

taskcluster/scripts/misc/build-sysroot-wasi.sh

@@ -7,7 +7,9 @@ sysroot=${artifact%.tar.*}
 # Make the wasi compiler-rt available to clang.
 env UPLOAD_DIR= $GECKO_PATH/taskcluster/scripts/misc/repack-clang.sh
 
-patch -d $MOZ_FETCHES_DIR/wasi-sdk -p1 < $(dirname $0)/wasi-sdk.patch
+if [ -n "$1" ]; then
+  patch -d $MOZ_FETCHES_DIR/wasi-sdk -p1 < $(dirname $0)/$1
+fi
 
 cd $MOZ_FETCHES_DIR/wasi-sdk
 LLVM_PROJ_DIR=$MOZ_FETCHES_DIR/llvm-project
@@ -27,7 +29,7 @@ ln -s llvm-ar build/install/wasi/bin/ar
 do_make() {
   make \
     LLVM_PROJ_DIR=$LLVM_PROJ_DIR \
-    PREFIX=/wasi \
+    PREFIX=$(grep -q BUILD_PREFIX Makefile || echo $PWD/build/install)/wasi \
     -j$(nproc) \
     $1
 }
@@ -41,6 +43,9 @@ do_make build/wasi-libc.BUILT
 touch build/compiler-rt.BUILT
 
 do_make build/libcxx.BUILT
+if grep -q build/libcxxabi.BUILT Makefile; then
+    do_make build/libcxxabi.BUILT
+fi
 
 mv build/install/wasi/share/wasi-sysroot $sysroot
 tar --zstd -cf $artifact $sysroot

taskcluster/scripts/misc/wasi-sdk-11.patch

@@ -0,0 +1,14 @@
+# https://github.com/WebAssembly/wasi-sdk/pull/189
+diff --git a/Makefile b/Makefile
+index bde9936..b1f24fe 100644
+--- a/Makefile
++++ b/Makefile
+@@ -91,7 +91,7 @@ build/wasi-libc.BUILT: build/llvm.BUILT
+ 		SYSROOT=$(BUILD_PREFIX)/share/wasi-sysroot
+ 	touch build/wasi-libc.BUILT
+ 
+-build/compiler-rt.BUILT: build/llvm.BUILT
++build/compiler-rt.BUILT: build/llvm.BUILT build/wasi-libc.BUILT
+ 	# Do the build, and install it.
+ 	mkdir -p build/compiler-rt
+ 	cd build/compiler-rt && cmake -G Ninja \

testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/setTargetAtTime-after-event-within-block.html

@@ -53,10 +53,12 @@ promise_test(function() {
 }, "setTargetAtTime() after setValueAtTime()");
 
 promise_test(async function() {
-  const bufferSize = 128;
+  const bufferSize = 129;
   const sampleRate = 16384;
   const startSample1 = 125;
   const target1 = Math.fround(-1./Math.expm1(-1.));
+  // Intentionally testing the second curve before and after the
+  // rendering quantum boundary.
   const startSample2 = startSample1 + 1;
   const target2 = 0.;
   const timeConstant = 1./sampleRate;
@@ -88,5 +90,10 @@ promise_test(async function() {
     Math.fround(output[startSample2] * Math.exp(-1.)),
     tolerance,
     "scheduled value at startSample2 + 1");
+  assert_approx_equals(
+    output[startSample2 + 2],
+    Math.fround(output[startSample2] * Math.exp(-2.)),
+    tolerance,
+    "scheduled value at startSample2 + 2");
 }, "setTargetAtTime() after setTargetAtTime()");
 </script>