Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 79 insertions, 0 deletions

diff --git a/js/src/jit/Linker.cpp b/js/src/jit/Linker.cpp
new file mode 100644
index 0000000000..aedebcecbe
--- /dev/null
+++ b/js/src/jit/Linker.cpp
@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * 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 "jit/JitZone.h"
+#include "util/Memory.h"
+
+#include "gc/StoreBuffer-inl.h"
+
+namespace js {
+namespace jit {
+
+JitCode* Linker::newCode(JSContext* cx, CodeKind kind) {
+  JS::AutoAssertNoGC nogc(cx);
+  if (masm.oom()) {
+    return fail(cx);
+  }
+
+  static const size_t ExecutableAllocatorAlignment = sizeof(void*);
+  static_assert(CodeAlignment >= ExecutableAllocatorAlignment,
+                "Unexpected alignment requirements");
+
+  // We require enough bytes for the code, header, and worst-case alignment
+  // padding.
+  size_t bytesNeeded = masm.bytesNeeded() + sizeof(JitCodeHeader) +
+                       (CodeAlignment - ExecutableAllocatorAlignment);
+  if (bytesNeeded >= MAX_BUFFER_SIZE) {
+    return fail(cx);
+  }
+
+  // ExecutableAllocator requires bytesNeeded to be aligned.
+  bytesNeeded = AlignBytes(bytesNeeded, ExecutableAllocatorAlignment);
+
+  JitZone* jitZone = cx->zone()->getJitZone(cx);
+  if (!jitZone) {
+    // Note: don't call fail(cx) here, getJitZone reports OOM.
+    return nullptr;
+  }
+
+  ExecutablePool* pool;
+  uint8_t* result =
+      (uint8_t*)jitZone->execAlloc().alloc(cx, bytesNeeded, &pool, kind);
+  if (!result) {
+    return fail(cx);
+  }
+
+  // The JitCodeHeader will be stored right before the code buffer.
+  uint8_t* codeStart = result + sizeof(JitCodeHeader);
+
+  // Bump the code up to a nice alignment.
+  codeStart = (uint8_t*)AlignBytes((uintptr_t)codeStart, CodeAlignment);
+  MOZ_ASSERT(codeStart + masm.bytesNeeded() <= result + bytesNeeded);
+  uint32_t headerSize = codeStart - result;
+  JitCode* code =
+      JitCode::New<NoGC>(cx, codeStart, bytesNeeded, headerSize, pool, kind);
+  if (!code) {
+    return fail(cx);
+  }
+  if (masm.oom()) {
+    return fail(cx);
+  }
+  awjcf.emplace(result, bytesNeeded);
+  if (!awjcf->makeWritable()) {
+    return fail(cx);
+  }
+  code->copyFrom(masm);
+  masm.link(code);
+  if (masm.embedsNurseryPointers()) {
+    cx->runtime()->gc.storeBuffer().putWholeCell(code);
+  }
+  return code;
+}
+
+}  // namespace jit
+}  // namespace js