90 lines
3.7 KiB
Python
90 lines
3.7 KiB
Python
# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
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# vim: set filetype=python:
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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@template
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def RLBoxLibrary(name, use_segue=True):
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WASM_SOURCES += [
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"/memory/mozalloc/mozalloc.cpp",
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"/third_party/rlbox_wasm2c_sandbox/c_src/wasm2c_sandbox_wrapper.c",
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]
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if CONFIG["DEVELOPER_OPTIONS"]:
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wasm_sources = sorted(f"!{name}.wasm_{n}.c" for n in range(16))
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else:
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wasm_sources = [f"!{name}.wasm.c"]
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SOURCES += wasm_sources
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SOURCES += ["/third_party/wasm2c/wasm2c/wasm-rt-impl.c"]
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SOURCES += ["/third_party/wasm2c/wasm2c/wasm-rt-mem-impl.c"]
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# Configuration for the wasm2c runtime used by RLBox
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# Enable SIMD autovectorization
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if CONFIG["WASM_CC_VERSION"] and int(CONFIG["WASM_CC_VERSION"].split(".")[0]) >= 11:
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WASM_CXXFLAGS += ["-msimd128"]
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# Use a mmap style allocation
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DEFINES["WASM_RT_USE_MMAP"] = 1
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# Don't use internal signal handler as Firefox already provides one
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DEFINES["WASM_RT_SKIP_SIGNAL_RECOVERY"] = 1
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# We provide a custom trap handler that calls MOZ_CRASH
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DEFINES["WASM_RT_TRAP_HANDLER"] = "moz_wasm2c_trap_handler"
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# Don't limit the nested call depth
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DEFINES["WASM_RT_NONCONFORMING_UNCHECKED_STACK_EXHAUSTION"] = 1
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# Configure the wasm runtime to invoke a callback when a Wasm memory growth
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# fails inside the sandbox. This information is used to annotate crash reports.
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DEFINES["WASM_RT_GROW_FAILED_HANDLER"] = "moz_wasm2c_memgrow_failed"
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for source in wasm_sources:
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SOURCES[source].flags += ["-Wno-unused"]
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# Use Segue optimization. Since this requires passing the "-mfsgsbase", we
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# restrict this to compilers and architectures that support this flag.
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# Manually exclude android for now due to bug in upstream wasm2c support
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if (
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use_segue
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and CONFIG["CC_TYPE"] in ("clang", "gcc")
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and CONFIG["TARGET_CPU"] == "x86_64"
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and CONFIG["OS_TARGET"] != "Android"
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# https://github.com/llvm/llvm-project/issues/124238
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and not (CONFIG["MOZ_ASAN"] or CONFIG["MOZ_TSAN"])
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):
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# Setting WASM_RT_ALLOW_SEGUE means Segue is used on supported
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# OS/compiler/Arch combinations. For example, it is used for
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# Linux/clang/x86_64 but not on Windows
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DEFINES["WASM_RT_ALLOW_SEGUE"] = 1
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# Segue can assume there is no other use of the segment register by the
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# application. This is fine as the System V ABI for x86_64 systems does
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# not use the gs register for any other purpose.
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DEFINES["WASM_RT_SEGUE_FREE_SEGMENT"] = 1
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# Add a compiler flag for the wasm2c produced file to enable use of
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# wrgsbase64 instruction via intrinsics. While this instruction is
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# available only on CPUs starting Ivybridge, the wasm2c runtime checks for
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# support before using this instruction. Thus, enabling this flag does not
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# introduce a dependency on newer CPUs to Firefox.
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CFLAGS += ["-mfsgsbase"]
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WASM_DEFINES["MOZ_IN_WASM_SANDBOX"] = True
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if CONFIG["ENABLE_CLANG_PLUGIN"]:
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WASM_DEFINES["MOZ_CLANG_PLUGIN"] = True
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SANDBOXED_WASM_LIBRARY_NAME = f"{name}.wasm"
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# Ideally we'd also list {name}.wasm.h as an output, but that would put the
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# generation in export rather than pre-compile, and we prefer the latter.
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GeneratedFile(
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f"{name}.wasm.c",
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script="/config/wasm2c.py",
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entry_point="wasm2c",
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inputs=["!/dist/host/bin/wasm2c" + CONFIG["HOST_BIN_SUFFIX"], f"!{name}.wasm"],
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flags=["--num-outputs", len(wasm_sources)] if len(wasm_sources) > 1 else [],
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)
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