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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
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
@template
def RLBoxLibrary(name):
WASM_SOURCES += [
"/memory/mozalloc/mozalloc.cpp",
"/third_party/rlbox_wasm2c_sandbox/c_src/wasm2c_sandbox_wrapper.c",
]
SOURCES += [f"!{name}.wasm.c"]
SOURCES += ["/third_party/wasm2c/wasm2c/wasm-rt-impl.c"]
# Configuration for the wasm2c runtime used by RLBox
# Enable SIMD autovectorization
if CONFIG["WASM_CC_VERSION"] and int(CONFIG["WASM_CC_VERSION"].split(".")[0]) >= 11:
WASM_CXXFLAGS += ["-msimd128"]
# Use a mmap style allocation
DEFINES["WASM_RT_USE_MMAP"] = 1
# Don't use internal signal handler as Firefox already provides one
DEFINES["WASM_RT_SKIP_SIGNAL_RECOVERY"] = 1
# We provide a custom trap handler that calls MOZ_CRASH
DEFINES["WASM_RT_TRAP_HANDLER"] = "moz_wasm2c_trap_handler"
# Don't limit the nested call depth
DEFINES["WASM_RT_USE_STACK_DEPTH_COUNT"] = 0
# Configure the wasm runtime to invoke a callback when a Wasm memory growth
# fails inside the sandbox. This information is used to annotate crash reports.
DEFINES["WASM_RT_GROW_FAILED_HANDLER"] = "moz_wasm2c_memgrow_failed"
SOURCES[f"!{name}.wasm.c"].flags += [
"-Wno-unused",
]
WASM_DEFINES["MOZ_IN_WASM_SANDBOX"] = True
if CONFIG["ENABLE_CLANG_PLUGIN"]:
WASM_DEFINES["MOZ_CLANG_PLUGIN"] = True
SANDBOXED_WASM_LIBRARY_NAME = f"{name}.wasm"
# Ideally we'd also list {name}.wasm.h as an output, but that would put the
# generation in export rather than pre-compile, and we prefer the latter.
GeneratedFile(
f"{name}.wasm.c",
script="/config/wasm2c.py",
entry_point="wasm2c",
inputs=["!/dist/host/bin/wasm2c" + CONFIG["HOST_BIN_SUFFIX"], f"!{name}.wasm"],
)
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