Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 174 insertions, 0 deletions

diff --git a/dom/script/ScriptCompression.cpp b/dom/script/ScriptCompression.cpp
new file mode 100644
index 0000000000..7aa8f08de2
--- /dev/null
+++ b/dom/script/ScriptCompression.cpp
@@ -0,0 +1,174 @@
+/* -*- 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 "zlib.h"
+#include "ScriptLoadRequest.h"
+#include "ScriptLoader.h"
+#include "mozilla/PerfStats.h"
+#include "mozilla/ProfilerMarkers.h"
+#include "mozilla/Vector.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs_browser.h"
+
+using namespace mozilla;
+
+namespace JS::loader {
+
+#undef LOG
+#define LOG(args)                                       \
+  MOZ_LOG(mozilla::dom::ScriptLoader::gScriptLoaderLog, \
+          mozilla::LogLevel::Debug, args)
+
+/*
+ * ScriptBytecodeDataLayout
+ *
+ * ScriptBytecodeDataLayout provides accessors to maintain the correct data
+ * layout of the ScriptLoadRequest's script bytecode buffer.
+ */
+class ScriptBytecodeDataLayout {
+ public:
+  explicit ScriptBytecodeDataLayout(mozilla::Vector<uint8_t>& aBytecode,
+                                    size_t aBytecodeOffset)
+      : mBytecode(aBytecode), mBytecodeOffset(aBytecodeOffset) {}
+
+  uint8_t* prelude() const { return mBytecode.begin(); }
+  size_t preludeLength() const { return mBytecodeOffset; }
+
+  uint8_t* bytecode() const { return prelude() + mBytecodeOffset; }
+  size_t bytecodeLength() const { return mBytecode.length() - preludeLength(); }
+
+  mozilla::Vector<uint8_t>& mBytecode;
+  size_t mBytecodeOffset;
+};
+
+/*
+ * ScriptBytecodeCompressedDataLayout
+ *
+ * ScriptBytecodeCompressedDataLayout provides accessors to maintain the correct
+ * data layout of a compressed script bytecode buffer.
+ */
+class ScriptBytecodeCompressedDataLayout {
+ public:
+  using UncompressedLengthType = uint32_t;
+
+  explicit ScriptBytecodeCompressedDataLayout(
+      mozilla::Vector<uint8_t>& aBytecode, size_t aBytecodeOffset)
+      : mBytecode(aBytecode), mBytecodeOffset(aBytecodeOffset) {}
+
+  uint8_t* prelude() const { return mBytecode.begin(); }
+  size_t preludeLength() const { return mBytecodeOffset; }
+
+  uint8_t* uncompressedLength() const { return prelude() + mBytecodeOffset; }
+  size_t uncompressedLengthLength() const {
+    return sizeof(UncompressedLengthType);
+  }
+
+  uint8_t* bytecode() const {
+    return uncompressedLength() + uncompressedLengthLength();
+  }
+  size_t bytecodeLength() const {
+    return mBytecode.length() - uncompressedLengthLength() - preludeLength();
+  }
+
+  mozilla::Vector<uint8_t>& mBytecode;
+  size_t mBytecodeOffset;
+};
+
+bool ScriptBytecodeCompress(Vector<uint8_t>& aBytecodeBuf,
+                            size_t aBytecodeOffset,
+                            Vector<uint8_t>& aCompressedBytecodeBufOut) {
+  // TODO probably need to move this to a helper thread
+
+  AUTO_PROFILER_MARKER_TEXT("ScriptBytecodeCompress", JS, {}, ""_ns);
+  PerfStats::AutoMetricRecording<PerfStats::Metric::JSBC_Compression>
+      autoRecording;
+
+  ScriptBytecodeDataLayout uncompressedLayout(aBytecodeBuf, aBytecodeOffset);
+  ScriptBytecodeCompressedDataLayout compressedLayout(
+      aCompressedBytecodeBufOut, uncompressedLayout.preludeLength());
+  ScriptBytecodeCompressedDataLayout::UncompressedLengthType
+      uncompressedLength = uncompressedLayout.bytecodeLength();
+  z_stream zstream{.next_in = uncompressedLayout.bytecode(),
+                   .avail_in = uncompressedLength};
+  auto compressedLength = deflateBound(&zstream, uncompressedLength);
+  if (!aCompressedBytecodeBufOut.resizeUninitialized(
+          compressedLength + compressedLayout.preludeLength() +
+          compressedLayout.uncompressedLengthLength())) {
+    return false;
+  }
+  memcpy(compressedLayout.prelude(), uncompressedLayout.prelude(),
+         uncompressedLayout.preludeLength());
+  memcpy(compressedLayout.uncompressedLength(), &uncompressedLength,
+         sizeof(uncompressedLength));
+  zstream.next_out = compressedLayout.bytecode();
+  zstream.avail_out = compressedLength;
+
+  const uint32_t compressionLevel =
+      StaticPrefs::browser_cache_jsbc_compression_level();
+  if (deflateInit(&zstream, compressionLevel) != Z_OK) {
+    LOG(
+        ("ScriptLoadRequest: Unable to initialize bytecode cache "
+         "compression."));
+    return false;
+  }
+  auto autoDestroy = MakeScopeExit([&]() { deflateEnd(&zstream); });
+
+  int ret = deflate(&zstream, Z_FINISH);
+  if (ret == Z_MEM_ERROR) {
+    return false;
+  }
+  MOZ_RELEASE_ASSERT(ret == Z_STREAM_END);
+
+  aCompressedBytecodeBufOut.shrinkTo(zstream.next_out -
+                                     aCompressedBytecodeBufOut.begin());
+  return true;
+}
+
+bool ScriptBytecodeDecompress(Vector<uint8_t>& aCompressedBytecodeBuf,
+                              size_t aBytecodeOffset,
+                              Vector<uint8_t>& aBytecodeBufOut) {
+  AUTO_PROFILER_MARKER_TEXT("ScriptBytecodeDecompress", JS, {}, ""_ns);
+  PerfStats::AutoMetricRecording<PerfStats::Metric::JSBC_Decompression>
+      autoRecording;
+
+  ScriptBytecodeDataLayout uncompressedLayout(aBytecodeBufOut, aBytecodeOffset);
+  ScriptBytecodeCompressedDataLayout compressedLayout(
+      aCompressedBytecodeBuf, uncompressedLayout.preludeLength());
+  ScriptBytecodeCompressedDataLayout::UncompressedLengthType uncompressedLength;
+  memcpy(&uncompressedLength, compressedLayout.uncompressedLength(),
+         compressedLayout.uncompressedLengthLength());
+  if (!aBytecodeBufOut.resizeUninitialized(uncompressedLayout.preludeLength() +
+                                           uncompressedLength)) {
+    return false;
+  }
+  memcpy(uncompressedLayout.prelude(), compressedLayout.prelude(),
+         compressedLayout.preludeLength());
+
+  z_stream zstream{nullptr};
+  zstream.next_in = compressedLayout.bytecode();
+  zstream.avail_in = static_cast<uint32_t>(compressedLayout.bytecodeLength());
+  zstream.next_out = uncompressedLayout.bytecode();
+  zstream.avail_out = uncompressedLength;
+  if (inflateInit(&zstream) != Z_OK) {
+    LOG(("ScriptLoadRequest: inflateInit FAILED (%s)", zstream.msg));
+    return false;
+  }
+  auto autoDestroy = MakeScopeExit([&]() { inflateEnd(&zstream); });
+
+  int ret = inflate(&zstream, Z_NO_FLUSH);
+  bool ok = (ret == Z_OK || ret == Z_STREAM_END) && zstream.avail_in == 0;
+  if (!ok) {
+    LOG(("ScriptLoadReques: inflate FAILED (%s)", zstream.msg));
+    return false;
+  }
+
+  return true;
+}
+
+#undef LOG
+
+}  // namespace JS::loader