js/src/jit/IonLinker.h@6474c204b198 (annotated)
js/src/jit/IonLinker.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * vim: set ts=8 sts=4 et sw=4 tw=99: |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #ifndef jit_IonLinker_h |
| michael@0 | 8 | #define jit_IonLinker_h |
| michael@0 | 9 | |
| michael@0 | 10 | #include "jscntxt.h" |
| michael@0 | 11 | #include "jscompartment.h" |
| michael@0 | 12 | #include "jsgc.h" |
| michael@0 | 13 | |
| michael@0 | 14 | #include "assembler/jit/ExecutableAllocator.h" |
| michael@0 | 15 | #include "jit/IonCode.h" |
| michael@0 | 16 | #include "jit/IonMacroAssembler.h" |
| michael@0 | 17 | #include "jit/JitCompartment.h" |
| michael@0 | 18 | |
| michael@0 | 19 | namespace js { |
| michael@0 | 20 | namespace jit { |
| michael@0 | 21 | |
| michael@0 | 22 | class Linker |
| michael@0 | 23 | { |
| michael@0 | 24 | MacroAssembler &masm; |
| michael@0 | 25 | |
| michael@0 | 26 | JitCode *fail(JSContext *cx) { |
| michael@0 | 27 | js_ReportOutOfMemory(cx); |
| michael@0 | 28 | return nullptr; |
| michael@0 | 29 | } |
| michael@0 | 30 | |
| michael@0 | 31 | template <AllowGC allowGC> |
| michael@0 | 32 | JitCode *newCode(JSContext *cx, JSC::ExecutableAllocator *execAlloc, JSC::CodeKind kind) { |
| michael@0 | 33 | JS_ASSERT(kind == JSC::ION_CODE || |
| michael@0 | 34 | kind == JSC::BASELINE_CODE || |
| michael@0 | 35 | kind == JSC::OTHER_CODE); |
| michael@0 | 36 | JS_ASSERT(masm.numAsmJSAbsoluteLinks() == 0); |
| michael@0 | 37 | |
| michael@0 | 38 | gc::AutoSuppressGC suppressGC(cx); |
| michael@0 | 39 | if (masm.oom()) |
| michael@0 | 40 | return fail(cx); |
| michael@0 | 41 | |
| michael@0 | 42 | JSC::ExecutablePool *pool; |
| michael@0 | 43 | size_t bytesNeeded = masm.bytesNeeded() + sizeof(JitCode *) + CodeAlignment; |
| michael@0 | 44 | if (bytesNeeded >= MAX_BUFFER_SIZE) |
| michael@0 | 45 | return fail(cx); |
| michael@0 | 46 | |
| michael@0 | 47 | // ExecutableAllocator requires bytesNeeded to be word-size aligned. |
| michael@0 | 48 | bytesNeeded = AlignBytes(bytesNeeded, sizeof(void *)); |
| michael@0 | 49 | |
| michael@0 | 50 | uint8_t *result = (uint8_t *)execAlloc->alloc(bytesNeeded, &pool, kind); |
| michael@0 | 51 | if (!result) |
| michael@0 | 52 | return fail(cx); |
| michael@0 | 53 | |
| michael@0 | 54 | // The JitCode pointer will be stored right before the code buffer. |
| michael@0 | 55 | uint8_t *codeStart = result + sizeof(JitCode *); |
| michael@0 | 56 | |
| michael@0 | 57 | // Bump the code up to a nice alignment. |
| michael@0 | 58 | codeStart = (uint8_t *)AlignBytes((uintptr_t)codeStart, CodeAlignment); |
| michael@0 | 59 | uint32_t headerSize = codeStart - result; |
| michael@0 | 60 | JitCode *code = JitCode::New<allowGC>(cx, codeStart, bytesNeeded - headerSize, |
| michael@0 | 61 | headerSize, pool, kind); |
| michael@0 | 62 | if (!code) |
| michael@0 | 63 | return nullptr; |
| michael@0 | 64 | if (masm.oom()) |
| michael@0 | 65 | return fail(cx); |
| michael@0 | 66 | code->copyFrom(masm); |
| michael@0 | 67 | masm.link(code); |
| michael@0 | 68 | #ifdef JSGC_GENERATIONAL |
| michael@0 | 69 | if (masm.embedsNurseryPointers()) |
| michael@0 | 70 | cx->runtime()->gcStoreBuffer.putWholeCell(code); |
| michael@0 | 71 | #endif |
| michael@0 | 72 | return code; |
| michael@0 | 73 | } |
| michael@0 | 74 | |
| michael@0 | 75 | public: |
| michael@0 | 76 | Linker(MacroAssembler &masm) |
| michael@0 | 77 | : masm(masm) |
| michael@0 | 78 | { |
| michael@0 | 79 | masm.finish(); |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | template <AllowGC allowGC> |
| michael@0 | 83 | JitCode *newCode(JSContext *cx, JSC::CodeKind kind) { |
| michael@0 | 84 | return newCode<allowGC>(cx, cx->runtime()->jitRuntime()->execAlloc(), kind); |
| michael@0 | 85 | } |
| michael@0 | 86 | |
| michael@0 | 87 | JitCode *newCodeForIonScript(JSContext *cx) { |
| michael@0 | 88 | #ifdef JS_CODEGEN_ARM |
| michael@0 | 89 | // ARM does not yet use implicit interrupt checks, see bug 864220. |
| michael@0 | 90 | return newCode<CanGC>(cx, JSC::ION_CODE); |
| michael@0 | 91 | #else |
| michael@0 | 92 | // The caller must lock the runtime against interrupt requests, as the |
| michael@0 | 93 | // thread requesting an interrupt may use the executable allocator below. |
| michael@0 | 94 | JS_ASSERT(cx->runtime()->currentThreadOwnsInterruptLock()); |
| michael@0 | 95 | |
| michael@0 | 96 | JSC::ExecutableAllocator *alloc = cx->runtime()->jitRuntime()->getIonAlloc(cx); |
| michael@0 | 97 | if (!alloc) |
| michael@0 | 98 | return nullptr; |
| michael@0 | 99 | |
| michael@0 | 100 | return newCode<CanGC>(cx, alloc, JSC::ION_CODE); |
| michael@0 | 101 | #endif |
| michael@0 | 102 | } |
| michael@0 | 103 | }; |
| michael@0 | 104 | |
| michael@0 | 105 | } // namespace jit |
| michael@0 | 106 | } // namespace js |
| michael@0 | 107 | |
| michael@0 | 108 | #endif /* jit_IonLinker_h */ |
