/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: set ts=8 sts=4 et sw=4 tw=99: * 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/. */ #include "jit/Linker.h" #include "gc/StoreBuffer-inl.h" namespace js { namespace jit { template <AllowGC allowGC> JitCode* Linker::newCode(JSContext* cx, CodeKind kind, bool hasPatchableBackedges /* = false */) { MOZ_ASSERT(masm.numSymbolicAccesses() == 0); MOZ_ASSERT_IF(hasPatchableBackedges, kind == ION_CODE); gc::AutoSuppressGC suppressGC(cx); if (masm.oom()) return fail(cx); ExecutablePool* pool; size_t bytesNeeded = masm.bytesNeeded() + sizeof(JitCode*) + CodeAlignment; if (bytesNeeded >= MAX_BUFFER_SIZE) return fail(cx); // ExecutableAllocator requires bytesNeeded to be word-size aligned. bytesNeeded = AlignBytes(bytesNeeded, sizeof(void*)); ExecutableAllocator& execAlloc = hasPatchableBackedges ? cx->runtime()->jitRuntime()->backedgeExecAlloc() : cx->runtime()->jitRuntime()->execAlloc(); uint8_t* result = (uint8_t*)execAlloc.alloc(bytesNeeded, &pool, kind); if (!result) return fail(cx); // The JitCode pointer will be stored right before the code buffer. uint8_t* codeStart = result + sizeof(JitCode*); // Bump the code up to a nice alignment. codeStart = (uint8_t*)AlignBytes((uintptr_t)codeStart, CodeAlignment); uint32_t headerSize = codeStart - result; JitCode* code = JitCode::New<allowGC>(cx, codeStart, bytesNeeded - headerSize, headerSize, pool, kind); if (!code) return nullptr; if (masm.oom()) return fail(cx); awjc.emplace(result, bytesNeeded); code->copyFrom(masm); masm.link(code); if (masm.embedsNurseryPointers()) cx->runtime()->gc.storeBuffer.putWholeCell(code); return code; } template JitCode* Linker::newCode<CanGC>(JSContext* cx, CodeKind kind, bool hasPatchableBackedges); template JitCode* Linker::newCode<NoGC>(JSContext* cx, CodeKind kind, bool hasPatchableBackedges); } // namespace jit } // namespace js