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-rw-r--r--xpcom/glue/standalone/moz.build36
-rw-r--r--xpcom/glue/standalone/nsXPCOMGlue.cpp422
2 files changed, 458 insertions, 0 deletions
diff --git a/xpcom/glue/standalone/moz.build b/xpcom/glue/standalone/moz.build
new file mode 100644
index 0000000000..bf4cce5daf
--- /dev/null
+++ b/xpcom/glue/standalone/moz.build
@@ -0,0 +1,36 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+SOURCES += [
+ "../FileUtils.cpp",
+ "../MemUtils.cpp",
+ "nsXPCOMGlue.cpp",
+]
+
+Library("xpcomglue")
+
+FORCE_STATIC_LIB = True
+
+if CONFIG["CC_TYPE"] == "clang-cl":
+ DEFINES["_USE_ANSI_CPP"] = True
+ # Don't include directives about which CRT to use
+ CFLAGS += ["-Zl"]
+ CXXFLAGS += ["-Zl"]
+
+DEFINES["XPCOM_GLUE"] = True
+
+LOCAL_INCLUDES += [
+ "../../build",
+ "../../threads",
+]
+
+# Don't use STL wrappers here (i.e. wrapped <new>); they require mozalloc
+DisableStlWrapping()
+
+DIST_INSTALL = True
+
+if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
+ CXXFLAGS += CONFIG["GLIB_CFLAGS"]
diff --git a/xpcom/glue/standalone/nsXPCOMGlue.cpp b/xpcom/glue/standalone/nsXPCOMGlue.cpp
new file mode 100644
index 0000000000..09edef10ee
--- /dev/null
+++ b/xpcom/glue/standalone/nsXPCOMGlue.cpp
@@ -0,0 +1,422 @@
+/* -*- 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 "mozilla/Bootstrap.h"
+
+#include "nsXPCOMPrivate.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "mozilla/FileUtils.h"
+#include "mozilla/Result.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/UniquePtrExtensions.h"
+
+using namespace mozilla;
+
+#define XPCOM_DEPENDENT_LIBS_LIST "dependentlibs.list"
+
+#if defined(XP_WIN)
+# define READ_TEXTMODE L"rt"
+#else
+# define READ_TEXTMODE "r"
+#endif
+
+typedef void (*NSFuncPtr)();
+
+#if defined(XP_WIN)
+# include <windows.h>
+using LibHandleType = HMODULE;
+#else
+using LibHandleType = void*;
+#endif
+
+using LibHandleResult = ::mozilla::Result<LibHandleType, DLErrorType>;
+
+#if defined(XP_WIN)
+# include <mbstring.h>
+# include "mozilla/WindowsVersion.h"
+# include "mozilla/PreXULSkeletonUI.h"
+
+static LibHandleResult GetLibHandle(pathstr_t aDependentLib) {
+ LibHandleType libHandle =
+ LoadLibraryExW(aDependentLib, nullptr, LOAD_WITH_ALTERED_SEARCH_PATH);
+
+ if (!libHandle) {
+ DWORD err = GetLastError();
+# if defined(DEBUG)
+ LPWSTR lpMsgBuf;
+ FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
+ FORMAT_MESSAGE_IGNORE_INSERTS,
+ nullptr, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+ (LPWSTR)&lpMsgBuf, 0, nullptr);
+ wprintf(L"Error loading %ls: %s\n", aDependentLib, lpMsgBuf);
+ LocalFree(lpMsgBuf);
+# endif // defined(DEBUG)
+ return Err(err);
+ }
+
+ return libHandle;
+}
+
+static NSFuncPtr GetSymbol(LibHandleType aLibHandle, const char* aSymbol) {
+ return (NSFuncPtr)GetProcAddress(aLibHandle, aSymbol);
+}
+
+static void CloseLibHandle(LibHandleType aLibHandle) {
+ FreeLibrary(aLibHandle);
+}
+
+#else
+# include <dlfcn.h>
+
+# if defined(MOZ_LINKER)
+extern "C" {
+NS_HIDDEN __typeof(dlopen) __wrap_dlopen;
+NS_HIDDEN __typeof(dlsym) __wrap_dlsym;
+NS_HIDDEN __typeof(dlclose) __wrap_dlclose;
+}
+
+# define dlopen __wrap_dlopen
+# define dlsym __wrap_dlsym
+# define dlclose __wrap_dlclose
+# endif
+
+static LibHandleResult GetLibHandle(pathstr_t aDependentLib) {
+ LibHandleType libHandle = dlopen(aDependentLib, RTLD_GLOBAL | RTLD_LAZY
+# ifdef XP_MACOSX
+ | RTLD_FIRST
+# endif
+ );
+ if (!libHandle) {
+ UniqueFreePtr<char> errMsg(strdup(dlerror()));
+ fprintf(stderr, "XPCOMGlueLoad error for file %s:\n%s\n", aDependentLib,
+ errMsg.get());
+ return Err(std::move(errMsg));
+ }
+ return libHandle;
+}
+
+static NSFuncPtr GetSymbol(LibHandleType aLibHandle, const char* aSymbol) {
+ return (NSFuncPtr)dlsym(aLibHandle, aSymbol);
+}
+
+# if !defined(MOZ_LINKER) && !defined(__ANDROID__)
+static void CloseLibHandle(LibHandleType aLibHandle) { dlclose(aLibHandle); }
+# endif
+#endif
+
+struct DependentLib {
+ LibHandleType libHandle;
+ DependentLib* next;
+};
+
+static DependentLib* sTop;
+
+static void AppendDependentLib(LibHandleType aLibHandle) {
+ auto* d = new DependentLib;
+ if (!d) {
+ return;
+ }
+
+ d->next = sTop;
+ d->libHandle = aLibHandle;
+
+ sTop = d;
+}
+
+using ReadDependentCBResult = ::mozilla::Result<::mozilla::Ok, DLErrorType>;
+
+static ReadDependentCBResult ReadDependentCB(
+ pathstr_t aDependentLib, LibLoadingStrategy aLibLoadingStrategy) {
+#if !defined(MOZ_LINKER) && !defined(__ANDROID__)
+ // Don't bother doing a ReadAhead if we're not in the parent process.
+ // What we need from the library should already be in the system file
+ // cache.
+ if (aLibLoadingStrategy == LibLoadingStrategy::ReadAhead) {
+ ReadAheadLib(aDependentLib);
+ }
+#endif
+ LibHandleType libHandle;
+ MOZ_TRY_VAR(libHandle, GetLibHandle(aDependentLib));
+
+ AppendDependentLib(libHandle);
+ return Ok();
+}
+
+#ifdef XP_WIN
+static ReadDependentCBResult ReadDependentCB(
+ const char* aDependentLib, LibLoadingStrategy aLibLoadingStrategy) {
+ wchar_t wideDependentLib[MAX_PATH];
+ MultiByteToWideChar(CP_UTF8, 0, aDependentLib, -1, wideDependentLib,
+ MAX_PATH);
+ return ReadDependentCB(wideDependentLib, aLibLoadingStrategy);
+}
+
+inline FILE* TS_tfopen(const char* path, const wchar_t* mode) {
+ wchar_t wPath[MAX_PATH];
+ MultiByteToWideChar(CP_UTF8, 0, path, -1, wPath, MAX_PATH);
+ return _wfopen(wPath, mode);
+}
+#else
+inline FILE* TS_tfopen(const char* aPath, const char* aMode) {
+ return fopen(aPath, aMode);
+}
+#endif
+
+/* RAII wrapper for FILE descriptors */
+struct ScopedCloseFileTraits {
+ typedef FILE* type;
+ static type empty() { return nullptr; }
+ static void release(type aFile) {
+ if (aFile) {
+ fclose(aFile);
+ }
+ }
+};
+typedef Scoped<ScopedCloseFileTraits> ScopedCloseFile;
+
+#if !defined(MOZ_LINKER) && !defined(__ANDROID__)
+static void XPCOMGlueUnload() {
+ while (sTop) {
+ CloseLibHandle(sTop->libHandle);
+
+ DependentLib* temp = sTop;
+ sTop = sTop->next;
+
+ delete temp;
+ }
+}
+#endif
+
+#if defined(XP_WIN)
+// like strpbrk but finds the *last* char, not the first
+static const char* ns_strrpbrk(const char* string, const char* strCharSet) {
+ const char* found = nullptr;
+ for (; *string; ++string) {
+ for (const char* search = strCharSet; *search; ++search) {
+ if (*search == *string) {
+ found = string;
+ // Since we're looking for the last char, we save "found"
+ // until we're at the end of the string.
+ }
+ }
+ }
+
+ return found;
+}
+#endif
+
+using XPCOMGlueLoadError = BootstrapError;
+using XPCOMGlueLoadResult =
+ ::mozilla::Result<::mozilla::Ok, XPCOMGlueLoadError>;
+
+static XPCOMGlueLoadResult XPCOMGlueLoad(
+ const char* aXPCOMFile, LibLoadingStrategy aLibLoadingStrategy) {
+#if defined(MOZ_LINKER) || defined(__ANDROID__)
+ ReadDependentCBResult readDependentCBResult =
+ ReadDependentCB(aXPCOMFile, aLibLoadingStrategy);
+ if (readDependentCBResult.isErr()) {
+ return Err(AsVariant(readDependentCBResult.unwrapErr()));
+ }
+#else
+ char xpcomDir[MAXPATHLEN];
+# ifdef XP_WIN
+ const char* lastSlash = ns_strrpbrk(aXPCOMFile, "/\\");
+# elif XP_MACOSX
+ // On OSX, the dependentlibs.list file lives under Contents/Resources.
+ // However, the actual libraries listed in dependentlibs.list live under
+ // Contents/MacOS. We want to read the list from Contents/Resources, then
+ // load the libraries from Contents/MacOS.
+ const char* tempSlash = strrchr(aXPCOMFile, '/');
+ size_t tempLen = size_t(tempSlash - aXPCOMFile);
+ if (tempLen > MAXPATHLEN) {
+ return Err(AsVariant(NS_ERROR_FAILURE));
+ }
+ char tempBuffer[MAXPATHLEN];
+ memcpy(tempBuffer, aXPCOMFile, tempLen);
+ tempBuffer[tempLen] = '\0';
+ const char* slash = strrchr(tempBuffer, '/');
+ tempLen = size_t(slash - tempBuffer);
+ const char* lastSlash = aXPCOMFile + tempLen;
+# else
+ const char* lastSlash = strrchr(aXPCOMFile, '/');
+# endif
+ char* cursor;
+ if (lastSlash) {
+ size_t len = size_t(lastSlash - aXPCOMFile);
+
+ if (len > MAXPATHLEN - sizeof(XPCOM_FILE_PATH_SEPARATOR
+# ifdef XP_MACOSX
+ "Resources" XPCOM_FILE_PATH_SEPARATOR
+# endif
+ XPCOM_DEPENDENT_LIBS_LIST)) {
+ return Err(AsVariant(NS_ERROR_FAILURE));
+ }
+ memcpy(xpcomDir, aXPCOMFile, len);
+ strcpy(xpcomDir + len, XPCOM_FILE_PATH_SEPARATOR
+# ifdef XP_MACOSX
+ "Resources" XPCOM_FILE_PATH_SEPARATOR
+# endif
+ XPCOM_DEPENDENT_LIBS_LIST);
+ cursor = xpcomDir + len + 1;
+ } else {
+ strcpy(xpcomDir, XPCOM_DEPENDENT_LIBS_LIST);
+ cursor = xpcomDir;
+ }
+
+ if (getenv("MOZ_RUN_GTEST")
+# ifdef FUZZING
+ || getenv("FUZZER")
+# endif
+ ) {
+ strcat(xpcomDir, ".gtest");
+ }
+
+ ScopedCloseFile flist;
+ flist = TS_tfopen(xpcomDir, READ_TEXTMODE);
+ if (!flist) {
+ return Err(AsVariant(NS_ERROR_FAILURE));
+ }
+
+# ifdef XP_MACOSX
+ tempLen = size_t(cursor - xpcomDir);
+ if (tempLen > MAXPATHLEN - sizeof("MacOS" XPCOM_FILE_PATH_SEPARATOR) - 1) {
+ return Err(AsVariant(NS_ERROR_FAILURE));
+ }
+ strcpy(cursor, "MacOS" XPCOM_FILE_PATH_SEPARATOR);
+ cursor += strlen(cursor);
+# endif
+ *cursor = '\0';
+
+ char buffer[MAXPATHLEN];
+
+ while (fgets(buffer, sizeof(buffer), flist)) {
+ int l = strlen(buffer);
+
+ // ignore empty lines and comments
+ if (l == 0 || *buffer == '#') {
+ continue;
+ }
+# ifdef XP_WIN
+ // There is no point in reading Universal CRT forwarder DLLs ahead on
+ // Windows 10 because they will not be touched later.
+ if (IsWin10OrLater() && !strncmp(buffer, "api-", 4)) {
+ continue;
+ }
+# endif
+
+ // cut the trailing newline, if present
+ if (buffer[l - 1] == '\n') {
+ buffer[l - 1] = '\0';
+ }
+
+ if (l + size_t(cursor - xpcomDir) > MAXPATHLEN) {
+ return Err(AsVariant(NS_ERROR_FAILURE));
+ }
+
+ strcpy(cursor, buffer);
+ ReadDependentCBResult readDependentCBResult =
+ ReadDependentCB(xpcomDir, aLibLoadingStrategy);
+ if (readDependentCBResult.isErr()) {
+ XPCOMGlueUnload();
+ return Err(AsVariant(readDependentCBResult.unwrapErr()));
+ }
+
+# ifdef XP_WIN
+ // We call PollPreXULSkeletonUIEvents here in order to not get flagged by
+ // Windows as nonresponsive. In order to not be flagged as such, we seem to
+ // simply need to respond to *a* message every few seconds. The halfway
+ // point on slow systems between process start and nsWindow taking over the
+ // skeleton UI window seems to be XUL being loaded. Accordingly, placing
+ // this call here covers the most ground (as we will call this after
+ // prefetching and loading all of the dlls in dependentlibs.list, which
+ // includes xul.dll.)
+ PollPreXULSkeletonUIEvents();
+# endif
+ }
+#endif
+ return Ok();
+}
+
+#if defined(MOZ_WIDGET_GTK) && \
+ (defined(MOZ_MEMORY) || defined(__FreeBSD__) || defined(__NetBSD__))
+# define MOZ_GSLICE_INIT
+#endif
+
+#ifdef MOZ_GSLICE_INIT
+# include <glib.h>
+
+class GSliceInit {
+ public:
+ GSliceInit() {
+ mHadGSlice = bool(getenv("G_SLICE"));
+ if (!mHadGSlice) {
+ // Disable the slice allocator, since jemalloc already uses similar layout
+ // algorithms, and using a sub-allocator tends to increase fragmentation.
+ // This must be done before g_thread_init() is called.
+ // glib >= 2.36 initializes g_slice as a side effect of its various static
+ // initializers, so this needs to happen before glib is loaded, which is
+ // this is hooked in XPCOMGlueStartup before libxul is loaded. This
+ // relies on the main executable not depending on glib.
+ setenv("G_SLICE", "always-malloc", 1);
+ }
+ }
+
+ ~GSliceInit() {
+ if (!mHadGSlice) {
+ unsetenv("G_SLICE");
+ }
+ }
+
+ private:
+ bool mHadGSlice;
+};
+#endif
+
+namespace mozilla {
+
+BootstrapResult GetBootstrap(const char* aXPCOMFile,
+ LibLoadingStrategy aLibLoadingStrategy) {
+#ifdef MOZ_GSLICE_INIT
+ GSliceInit gSliceInit;
+#endif
+
+ if (!aXPCOMFile) {
+ return Err(AsVariant(NS_ERROR_INVALID_ARG));
+ }
+
+ char* lastSlash =
+ strrchr(const_cast<char*>(aXPCOMFile), XPCOM_FILE_PATH_SEPARATOR[0]);
+ if (!lastSlash) {
+ return Err(AsVariant(NS_ERROR_FILE_INVALID_PATH));
+ }
+
+ size_t base_len = size_t(lastSlash - aXPCOMFile) + 1;
+
+ UniqueFreePtr<char> file(
+ reinterpret_cast<char*>(malloc(base_len + sizeof(XPCOM_DLL))));
+ memcpy(file.get(), aXPCOMFile, base_len);
+ memcpy(file.get() + base_len, XPCOM_DLL, sizeof(XPCOM_DLL));
+
+ MOZ_TRY(XPCOMGlueLoad(file.get(), aLibLoadingStrategy));
+
+ if (!sTop) {
+ return Err(AsVariant(NS_ERROR_NOT_AVAILABLE));
+ }
+ GetBootstrapType func =
+ (GetBootstrapType)GetSymbol(sTop->libHandle, "XRE_GetBootstrap");
+ if (!func) {
+ return Err(AsVariant(NS_ERROR_NOT_AVAILABLE));
+ }
+
+ Bootstrap::UniquePtr b;
+ (*func)(b);
+
+ return b;
+}
+
+} // namespace mozilla
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