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