michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef jit_IonLinker_h
michael@0: #define jit_IonLinker_h
michael@0: 
michael@0: #include "jscntxt.h"
michael@0: #include "jscompartment.h"
michael@0: #include "jsgc.h"
michael@0: 
michael@0: #include "assembler/jit/ExecutableAllocator.h"
michael@0: #include "jit/IonCode.h"
michael@0: #include "jit/IonMacroAssembler.h"
michael@0: #include "jit/JitCompartment.h"
michael@0: 
michael@0: namespace js {
michael@0: namespace jit {
michael@0: 
michael@0: class Linker
michael@0: {
michael@0:     MacroAssembler &masm;
michael@0: 
michael@0:     JitCode *fail(JSContext *cx) {
michael@0:         js_ReportOutOfMemory(cx);
michael@0:         return nullptr;
michael@0:     }
michael@0: 
michael@0:     template <AllowGC allowGC>
michael@0:     JitCode *newCode(JSContext *cx, JSC::ExecutableAllocator *execAlloc, JSC::CodeKind kind) {
michael@0:         JS_ASSERT(kind == JSC::ION_CODE ||
michael@0:                   kind == JSC::BASELINE_CODE ||
michael@0:                   kind == JSC::OTHER_CODE);
michael@0:         JS_ASSERT(masm.numAsmJSAbsoluteLinks() == 0);
michael@0: 
michael@0:         gc::AutoSuppressGC suppressGC(cx);
michael@0:         if (masm.oom())
michael@0:             return fail(cx);
michael@0: 
michael@0:         JSC::ExecutablePool *pool;
michael@0:         size_t bytesNeeded = masm.bytesNeeded() + sizeof(JitCode *) + CodeAlignment;
michael@0:         if (bytesNeeded >= MAX_BUFFER_SIZE)
michael@0:             return fail(cx);
michael@0: 
michael@0:         // ExecutableAllocator requires bytesNeeded to be word-size aligned.
michael@0:         bytesNeeded = AlignBytes(bytesNeeded, sizeof(void *));
michael@0: 
michael@0:         uint8_t *result = (uint8_t *)execAlloc->alloc(bytesNeeded, &pool, kind);
michael@0:         if (!result)
michael@0:             return fail(cx);
michael@0: 
michael@0:         // The JitCode pointer will be stored right before the code buffer.
michael@0:         uint8_t *codeStart = result + sizeof(JitCode *);
michael@0: 
michael@0:         // Bump the code up to a nice alignment.
michael@0:         codeStart = (uint8_t *)AlignBytes((uintptr_t)codeStart, CodeAlignment);
michael@0:         uint32_t headerSize = codeStart - result;
michael@0:         JitCode *code = JitCode::New<allowGC>(cx, codeStart, bytesNeeded - headerSize,
michael@0:                                               headerSize, pool, kind);
michael@0:         if (!code)
michael@0:             return nullptr;
michael@0:         if (masm.oom())
michael@0:             return fail(cx);
michael@0:         code->copyFrom(masm);
michael@0:         masm.link(code);
michael@0: #ifdef JSGC_GENERATIONAL
michael@0:         if (masm.embedsNurseryPointers())
michael@0:             cx->runtime()->gcStoreBuffer.putWholeCell(code);
michael@0: #endif
michael@0:         return code;
michael@0:     }
michael@0: 
michael@0:   public:
michael@0:     Linker(MacroAssembler &masm)
michael@0:       : masm(masm)
michael@0:     {
michael@0:         masm.finish();
michael@0:     }
michael@0: 
michael@0:     template <AllowGC allowGC>
michael@0:     JitCode *newCode(JSContext *cx, JSC::CodeKind kind) {
michael@0:         return newCode<allowGC>(cx, cx->runtime()->jitRuntime()->execAlloc(), kind);
michael@0:     }
michael@0: 
michael@0:     JitCode *newCodeForIonScript(JSContext *cx) {
michael@0: #ifdef JS_CODEGEN_ARM
michael@0:         // ARM does not yet use implicit interrupt checks, see bug 864220.
michael@0:         return newCode<CanGC>(cx, JSC::ION_CODE);
michael@0: #else
michael@0:         // The caller must lock the runtime against interrupt requests, as the
michael@0:         // thread requesting an interrupt may use the executable allocator below.
michael@0:         JS_ASSERT(cx->runtime()->currentThreadOwnsInterruptLock());
michael@0: 
michael@0:         JSC::ExecutableAllocator *alloc = cx->runtime()->jitRuntime()->getIonAlloc(cx);
michael@0:         if (!alloc)
michael@0:             return nullptr;
michael@0: 
michael@0:         return newCode<CanGC>(cx, alloc, JSC::ION_CODE);
michael@0: #endif
michael@0:     }
michael@0: };
michael@0: 
michael@0: } // namespace jit
michael@0: } // namespace js
michael@0: 
michael@0: #endif /* jit_IonLinker_h */