1 files changed, 120 insertions, 0 deletions
diff --git a/build/moz.configure/memory.configure b/build/moz.configure/memory.configure
new file mode 100644
index 0000000000..4368ad8c86
--- /dev/null
+++ b/build/moz.configure/memory.configure
@@ -0,0 +1,120 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+
+@depends(target, js_package)
+def jemalloc_default(target, js_package):
+    if js_package:
+        return False
+    return target.kernel in ("Darwin", "Linux", "WINNT")
+
+
+option(
+    "--enable-jemalloc",
+    env="MOZ_MEMORY",
+    default=jemalloc_default,
+    help="{Replace|Do not replace} memory allocator with jemalloc",
+)
+
+
+set_config("MOZ_MEMORY", True, when="--enable-jemalloc")
+set_define("MOZ_MEMORY", True, when="--enable-jemalloc")
+add_old_configure_assignment("MOZ_MEMORY", True, when="--enable-jemalloc")
+
+
+@depends(milestone, build_project)
+def replace_malloc_default(milestone, build_project):
+    if build_project == "memory":
+        return True
+    if milestone.is_early_beta_or_earlier and build_project != "js":
+        return True
+
+
+option(
+    "--enable-replace-malloc",
+    default=replace_malloc_default,
+    when="--enable-jemalloc",
+    help="{Enable|Disable} ability to dynamically replace the malloc implementation",
+)
+
+
+set_config("MOZ_REPLACE_MALLOC", True, when="--enable-replace-malloc")
+set_define("MOZ_REPLACE_MALLOC", True, when="--enable-replace-malloc")
+
+
+@depends(build_project, when="--enable-replace-malloc")
+def replace_malloc_static(build_project):
+    # Default to statically linking replace-malloc libraries that can be
+    # statically linked, except when building with --enable-project=memory.
+    if build_project != "memory":
+        return True
+
+
+set_config("MOZ_REPLACE_MALLOC_STATIC", replace_malloc_static)
+
+# PHC (Probabilistic Heap Checker)
+# ==============================================================
+
+
+# In general, it only makes sense for PHC to run on the platforms that have a
+# crash reporter.
+@depends(
+    build_project,
+    target,
+    when="--enable-jemalloc",
+)
+def phc_default(build_project, target):
+    if build_project == "js":
+        return False
+
+    # Both Linux32 and Win32 have frequent crashes when stack tracing (for
+    # unclear reasons), so PHC is enabled only on 64-bit only in both cases.
+    return (target.cpu in ("x86_64", "aarch64")) and (
+        (target.os == "GNU" and target.kernel == "Linux")
+        or (target.kernel == "WINNT")
+        or (target.os == "OSX")
+    )
+
+
+option(
+    "--enable-phc",
+    env="MOZ_PHC",
+    default=phc_default,
+    when="--enable-jemalloc",
+    help="{Enable|Disable} PHC (Probabilistic Memory Checker). "
+    "Also enables frame pointers when needed",
+)
+
+set_config("MOZ_PHC", True, when="--enable-phc")
+
+
+# PHC parses stacks using frame pointers on these systems.
+@depends("--enable-phc", target, have_unwind, when="--enable-jemalloc")
+def phc_implies_frame_pointers(phc, target, have_unwind):
+    if not phc:
+        return False
+
+    # This should be kept in sync with the ifdefs in memory/build/PHC.cpp
+    # that control stack walking.
+    # This is true for the first two options in PHC.cpp
+    if (target.os == "WINNT" and target.cpu == "x86") or target.kernel == "Darwin":
+        return True
+
+    # This should match the #defines in mozglue/misc/StackWalk.cpp
+    if (target.cpu in ("x86", "ppc")) and (target.kernel in ("Darwin", "Linux")):
+        return not have_unwind
+
+    return False
+
+
+imply_option("--enable-frame-pointers", True, when=phc_implies_frame_pointers)
+
+
+with only_when(depends(target.os)(lambda os: os != "WINNT")):
+    set_define("HAVE_STRNDUP", check_symbol("strndup"))
+    set_define("HAVE_POSIX_MEMALIGN", check_symbol("posix_memalign"))
+    set_define("HAVE_MEMALIGN", check_symbol("memalign"))
+    set_define("HAVE_MALLOC_USABLE_SIZE", check_symbol("malloc_usable_size"))