1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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
|
