From d8bbc7858622b6d9c278469aab701ca0b609cddf Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 15 May 2024 05:35:49 +0200 Subject: Merging upstream version 126.0. Signed-off-by: Daniel Baumann --- js/src/jit/TrampolineNatives.h | 60 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 js/src/jit/TrampolineNatives.h (limited to 'js/src/jit/TrampolineNatives.h') diff --git a/js/src/jit/TrampolineNatives.h b/js/src/jit/TrampolineNatives.h new file mode 100644 index 0000000000..f71a3b707d --- /dev/null +++ b/js/src/jit/TrampolineNatives.h @@ -0,0 +1,60 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * 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 jit_TrampolineNatives_h +#define jit_TrampolineNatives_h + +#include + +#include "js/TypeDecls.h" + +// [SMDOC] Trampoline Natives +// +// Trampoline natives are JS builtin functions that use the NATIVE_JIT_ENTRY +// mechanism. This means they have two implementations: the usual native C++ +// implementation and a generated JIT trampoline that JIT callers can call +// directly using the JIT ABI calling convention. (This is very similar to how +// calls from JS to WebAssembly are optimized in the JITs.) +// +// The JIT trampoline lets us implement some natives in a more efficient way. In +// particular, it's much faster to call (other) JS functions with JIT code from +// a JIT trampoline than from C++ code. +// +// Trampoline frames use FrameType::TrampolineNative. + +class JSJitInfo; + +namespace JS { +class CallArgs; +} // namespace JS + +// List of all trampoline natives. +#define TRAMPOLINE_NATIVE_LIST(_) _(ArraySort) + +namespace js { +namespace jit { + +enum class TrampolineNative : uint16_t { +#define ADD_NATIVE(native) native, + TRAMPOLINE_NATIVE_LIST(ADD_NATIVE) +#undef ADD_NATIVE + Count +}; + +#define ADD_NATIVE(native) extern const JSJitInfo JitInfo_##native; +TRAMPOLINE_NATIVE_LIST(ADD_NATIVE) +#undef ADD_NATIVE + +void SetTrampolineNativeJitEntry(JSContext* cx, JSFunction* fun, + TrampolineNative native); + +bool CallTrampolineNativeJitCode(JSContext* cx, TrampolineNative native, + JS::CallArgs& args); + +} // namespace jit +} // namespace js + +#endif /* jit_TrampolineNatives_h */ -- cgit v1.2.3