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# -*- 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
@depends(target, js_package)
def jemalloc_default(target, js_package):
if js_package:
return False
return target.kernel in ("Darwin", "Linux", "WINNT")
# mozjemalloc doesn't work with these sanitisers, it mostly-works with ubsan
# (so we leave that enabled) except for loading the configuration from the
# environment, it will fall-back to default settings.
imply_option("--enable-jemalloc", False, when=asan | msan | tsan)
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")
@depends("--enable-jemalloc", moz_debug, win32_redist_dir)
def check_redist(jemalloc, debug, win32_redist_dir):
if not jemalloc and not win32_redist_dir and not debug:
log.warning(
"When not building jemalloc, you need to build with --with-redist or set WIN32_REDIST_DIR."
)
@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,
milestone,
target,
when="--enable-jemalloc",
)
def phc_default(build_project, milestone, target):
if build_project == "js":
return False
# Win32 has frequent crashes when stack tracing (for unclear reasons),
# so PHC is enabled only on 64-bit. MacOS doesn't have a 32-bit version.
# Therefore we've only been testing on 64bit processors.
return (target.cpu in ("x86_64", "aarch64")) and (
(target.os == "GNU" and target.kernel == "Linux")
or (target.kernel == "WINNT")
or (target.os == "OSX")
or (target.os == "Android" and milestone.is_early_beta_or_earlier)
)
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"))
have_malloc_usable_size = check_symbol("malloc_usable_size")
set_define("HAVE_MALLOC_USABLE_SIZE", have_malloc_usable_size)
@template
def check_malloc_header():
found_header = dependable(None)
malloc_headers = ("malloc.h", "malloc_np.h", "malloc/malloc.h", "sys/malloc.h")
for malloc_h in malloc_headers:
have_malloc_h = check_header(malloc_h, when=~found_header)
found_header = depends(have_malloc_h, found_header)(
lambda h, f: malloc_h if h else f
)
return found_header
malloc_h = check_malloc_header()
have_malloc_h = depends(malloc_h)(lambda h: h == "malloc.h")
set_define("MALLOC_H", depends_if(malloc_h)(lambda h: f"<{h}>"))
usable_size_constness = c_compiler.try_compile(
includes=depends(malloc_h)(lambda h: [h, "stddef.h"]),
body="""
extern size_t malloc_usable_size(const void *ptr);
return malloc_usable_size(0);
""",
check_msg="whether malloc_usable_size definition can use const argument",
when=have_malloc_usable_size,
)
set_define(
"MALLOC_USABLE_SIZE_CONST_PTR",
depends(usable_size_constness, have_malloc_h)(
lambda u, h: "const" if (u or not h) else ""
),
)