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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /tools/profiler/public/ProfileBufferEntrySerializationGeckoExtensions.h
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/profiler/public/ProfileBufferEntrySerializationGeckoExtensions.h')
-rw-r--r--tools/profiler/public/ProfileBufferEntrySerializationGeckoExtensions.h160
1 files changed, 160 insertions, 0 deletions
diff --git a/tools/profiler/public/ProfileBufferEntrySerializationGeckoExtensions.h b/tools/profiler/public/ProfileBufferEntrySerializationGeckoExtensions.h
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+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#ifndef ProfileBufferEntrySerializationGeckoExtensions_h
+#define ProfileBufferEntrySerializationGeckoExtensions_h
+
+#include "mozilla/ProfileBufferEntrySerialization.h"
+
+#include "js/AllocPolicy.h"
+#include "js/Utility.h"
+#include "nsString.h"
+
+namespace mozilla {
+
+// ----------------------------------------------------------------------------
+// ns[C]String
+
+// nsString or nsCString contents are serialized as the number of bytes (encoded
+// as ULEB128) and all the characters in the string. The terminal '\0' is
+// omitted.
+// Make sure you write and read with the same character type!
+//
+// Usage: `nsCString s = ...; aEW.WriteObject(s);`
+template <typename CHAR>
+struct ProfileBufferEntryWriter::Serializer<nsTString<CHAR>> {
+ static Length Bytes(const nsTString<CHAR>& aS) {
+ const auto length = aS.Length();
+ return ProfileBufferEntryWriter::ULEB128Size(length) +
+ static_cast<Length>(length * sizeof(CHAR));
+ }
+
+ static void Write(ProfileBufferEntryWriter& aEW, const nsTString<CHAR>& aS) {
+ const auto length = aS.Length();
+ aEW.WriteULEB128(length);
+ // Copy the bytes from the string's buffer.
+ aEW.WriteBytes(aS.Data(), length * sizeof(CHAR));
+ }
+};
+
+template <typename CHAR>
+struct ProfileBufferEntryReader::Deserializer<nsTString<CHAR>> {
+ static void ReadInto(ProfileBufferEntryReader& aER, nsTString<CHAR>& aS) {
+ aS = Read(aER);
+ }
+
+ static nsTString<CHAR> Read(ProfileBufferEntryReader& aER) {
+ const Length length = aER.ReadULEB128<Length>();
+ nsTString<CHAR> s;
+ // BulkWrite is the most efficient way to copy bytes into the target string.
+ auto writerOrErr = s.BulkWrite(length, 0, true);
+ MOZ_RELEASE_ASSERT(!writerOrErr.isErr());
+
+ auto writer = writerOrErr.unwrap();
+
+ aER.ReadBytes(writer.Elements(), length * sizeof(CHAR));
+ writer.Finish(length, true);
+ return s;
+ }
+};
+
+// ----------------------------------------------------------------------------
+// nsAuto[C]String
+
+// nsAuto[C]String contents are serialized as the number of bytes (encoded as
+// ULEB128) and all the characters in the string. The terminal '\0' is omitted.
+// Make sure you write and read with the same character type!
+//
+// Usage: `nsAutoCString s = ...; aEW.WriteObject(s);`
+template <typename CHAR, size_t N>
+struct ProfileBufferEntryWriter::Serializer<nsTAutoStringN<CHAR, N>> {
+ static Length Bytes(const nsTAutoStringN<CHAR, N>& aS) {
+ const auto length = aS.Length();
+ return ProfileBufferEntryWriter::ULEB128Size(length) +
+ static_cast<Length>(length * sizeof(CHAR));
+ }
+
+ static void Write(ProfileBufferEntryWriter& aEW,
+ const nsTAutoStringN<CHAR, N>& aS) {
+ const auto length = aS.Length();
+ aEW.WriteULEB128(length);
+ // Copy the bytes from the string's buffer.
+ aEW.WriteBytes(aS.BeginReading(), length * sizeof(CHAR));
+ }
+};
+
+template <typename CHAR, size_t N>
+struct ProfileBufferEntryReader::Deserializer<nsTAutoStringN<CHAR, N>> {
+ static void ReadInto(ProfileBufferEntryReader& aER,
+ nsTAutoStringN<CHAR, N>& aS) {
+ aS = Read(aER);
+ }
+
+ static nsTAutoStringN<CHAR, N> Read(ProfileBufferEntryReader& aER) {
+ const auto length = aER.ReadULEB128<Length>();
+ nsTAutoStringN<CHAR, N> s;
+ // BulkWrite is the most efficient way to copy bytes into the target string.
+ auto writerOrErr = s.BulkWrite(length, 0, true);
+ MOZ_RELEASE_ASSERT(!writerOrErr.isErr());
+
+ auto writer = writerOrErr.unwrap();
+ aER.ReadBytes(writer.Elements(), length * sizeof(CHAR));
+ writer.Finish(length, true);
+ return s;
+ }
+};
+
+// ----------------------------------------------------------------------------
+// JS::UniqueChars
+
+// JS::UniqueChars contents are serialized as the number of bytes (encoded as
+// ULEB128) and all the characters in the string. The terminal '\0' is omitted.
+// Note: A nullptr pointer will be serialized like an empty string, so when
+// deserializing it will result in an allocated buffer only containing a
+// single null terminator.
+//
+// Usage: `JS::UniqueChars s = ...; aEW.WriteObject(s);`
+template <>
+struct ProfileBufferEntryWriter::Serializer<JS::UniqueChars> {
+ static Length Bytes(const JS::UniqueChars& aS) {
+ if (!aS) {
+ return ProfileBufferEntryWriter::ULEB128Size<Length>(0);
+ }
+ const auto len = static_cast<Length>(strlen(aS.get()));
+ return ProfileBufferEntryWriter::ULEB128Size(len) + len;
+ }
+
+ static void Write(ProfileBufferEntryWriter& aEW, const JS::UniqueChars& aS) {
+ if (!aS) {
+ aEW.WriteULEB128<Length>(0);
+ return;
+ }
+ const auto len = static_cast<Length>(strlen(aS.get()));
+ aEW.WriteULEB128(len);
+ aEW.WriteBytes(aS.get(), len);
+ }
+};
+
+template <>
+struct ProfileBufferEntryReader::Deserializer<JS::UniqueChars> {
+ static void ReadInto(ProfileBufferEntryReader& aER, JS::UniqueChars& aS) {
+ aS = Read(aER);
+ }
+
+ static JS::UniqueChars Read(ProfileBufferEntryReader& aER) {
+ const auto len = aER.ReadULEB128<Length>();
+ // Use the same allocation policy as JS_smprintf.
+ char* buffer =
+ static_cast<char*>(js::SystemAllocPolicy{}.pod_malloc<char>(len + 1));
+ aER.ReadBytes(buffer, len);
+ buffer[len] = '\0';
+ return JS::UniqueChars(buffer);
+ }
+};
+
+} // namespace mozilla
+
+#endif // ProfileBufferEntrySerializationGeckoExtensions_h