Add m-esr52 at 52.6.0

1 files changed, 349 insertions, 0 deletions

diff --git a/toolkit/xre/glxtest.cpp b/toolkit/xre/glxtest.cpp
new file mode 100644
index 000000000..519a5e68b
--- /dev/null
+++ b/toolkit/xre/glxtest.cpp
@@ -0,0 +1,349 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* 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/. */
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Explanation: See bug 639842. Safely getting GL driver info on X11 is hard, because the only way to do
+// that is to create a GL context and call glGetString(), but with bad drivers,
+// just creating a GL context may crash.
+//
+// This file implements the idea to do that in a separate process.
+//
+// The only non-static function here is fire_glxtest_process(). It creates a pipe, publishes its 'read' end as the
+// mozilla::widget::glxtest_pipe global variable, forks, and runs that GLX probe in the child process,
+// which runs the glxtest() static function. This creates a X connection, a GLX context, calls glGetString, and writes that
+// to the 'write' end of the pipe.
+
+#include <cstdio>
+#include <cstdlib>
+#include <unistd.h>
+#include <dlfcn.h>
+#include "nscore.h"
+#include <fcntl.h>
+#include "stdint.h"
+
+#if MOZ_WIDGET_GTK == 2
+#include <glib.h>
+#endif
+
+#ifdef __SUNPRO_CC
+#include <stdio.h>
+#endif
+
+#include "X11/Xlib.h"
+#include "X11/Xutil.h"
+
+#include "mozilla/Unused.h"
+
+// stuff from glx.h
+typedef struct __GLXcontextRec *GLXContext;
+typedef XID GLXPixmap;
+typedef XID GLXDrawable;
+/* GLX 1.3 and later */
+typedef struct __GLXFBConfigRec *GLXFBConfig;
+typedef XID GLXFBConfigID;
+typedef XID GLXContextID;
+typedef XID GLXWindow;
+typedef XID GLXPbuffer;
+#define GLX_RGBA        4
+#define GLX_RED_SIZE    8
+#define GLX_GREEN_SIZE  9
+#define GLX_BLUE_SIZE   10
+
+// stuff from gl.h
+typedef uint8_t GLubyte;
+typedef uint32_t GLenum;
+#define GL_VENDOR       0x1F00
+#define GL_RENDERER     0x1F01
+#define GL_VERSION      0x1F02
+
+namespace mozilla {
+namespace widget {
+// the read end of the pipe, which will be used by GfxInfo
+extern int glxtest_pipe;
+// the PID of the glxtest process, to pass to waitpid()
+extern pid_t glxtest_pid;
+}
+}
+
+// the write end of the pipe, which we're going to write to
+static int write_end_of_the_pipe = -1;
+
+#if MOZ_WIDGET_GTK == 2
+static int gtk_write_end_of_the_pipe = -1;
+int gtk_read_end_of_the_pipe = -1;
+#endif
+
+// C++ standard collides with C standard in that it doesn't allow casting void* to function pointer types.
+// So the work-around is to convert first to size_t.
+// http://www.trilithium.com/johan/2004/12/problem-with-dlsym/
+template<typename func_ptr_type>
+static func_ptr_type cast(void *ptr)
+{
+  return reinterpret_cast<func_ptr_type>(
+           reinterpret_cast<size_t>(ptr)
+         );
+}
+
+static void fatal_error(const char *str)
+{
+  mozilla::Unused << write(write_end_of_the_pipe, str, strlen(str));
+  mozilla::Unused << write(write_end_of_the_pipe, "\n", 1);
+  _exit(EXIT_FAILURE);
+}
+
+static int
+x_error_handler(Display *, XErrorEvent *ev)
+{
+  enum { bufsize = 1024 };
+  char buf[bufsize];
+  int length = snprintf(buf, bufsize,
+                        "X error occurred in GLX probe, error_code=%d, request_code=%d, minor_code=%d\n",
+                        ev->error_code,
+                        ev->request_code,
+                        ev->minor_code);
+  mozilla::Unused << write(write_end_of_the_pipe, buf, length);
+  _exit(EXIT_FAILURE);
+  return 0;
+}
+
+
+// glxtest is declared inside extern "C" so that the name is not mangled.
+// The name is used in build/valgrind/x86_64-redhat-linux-gnu.sup to suppress
+// memory leak errors because we run it inside a short lived fork and we don't
+// care about leaking memory
+extern "C" {
+
+void glxtest()
+{
+  // we want to redirect to /dev/null stdout, stderr, and while we're at it,
+  // any PR logging file descriptors. To that effect, we redirect all positive
+  // file descriptors up to what open() returns here. In particular, 1 is stdout and 2 is stderr.
+  int fd = open("/dev/null", O_WRONLY);
+  for (int i = 1; i < fd; i++)
+    dup2(fd, i);
+  close(fd);
+
+#if MOZ_WIDGET_GTK == 2
+  // On Gtk+2 builds, try to get the Gtk+3 version if it's installed, and
+  // use that in nsSystemInfo for secondaryLibrary. Better safe than sorry,
+  // we want to load the Gtk+3 library in a subprocess, and since we already
+  // have such a subprocess for the GLX test, we piggy back on it.
+  void *gtk3 = dlopen("libgtk-3.so.0", RTLD_LOCAL | RTLD_LAZY);
+  if (gtk3) {
+    auto gtk_get_major_version = reinterpret_cast<guint (*)(void)>(
+      dlsym(gtk3, "gtk_get_major_version"));
+    auto gtk_get_minor_version = reinterpret_cast<guint (*)(void)>(
+      dlsym(gtk3, "gtk_get_minor_version"));
+    auto gtk_get_micro_version = reinterpret_cast<guint (*)(void)>(
+      dlsym(gtk3, "gtk_get_micro_version"));
+
+    if (gtk_get_major_version && gtk_get_minor_version &&
+        gtk_get_micro_version) {
+      // 64 bytes is going to be well enough for "GTK " followed by 3 integers
+      // separated with dots.
+      char gtkver[64];
+      int len = snprintf(gtkver, sizeof(gtkver), "GTK %u.%u.%u",
+                         gtk_get_major_version(), gtk_get_minor_version(),
+                         gtk_get_micro_version());
+      if (len > 0 && size_t(len) < sizeof(gtkver)) {
+        mozilla::Unused << write(gtk_write_end_of_the_pipe, gtkver, len);
+      }
+    }
+  }
+#endif
+
+
+  if (getenv("MOZ_AVOID_OPENGL_ALTOGETHER"))
+    fatal_error("The MOZ_AVOID_OPENGL_ALTOGETHER environment variable is defined");
+
+  ///// Open libGL and load needed symbols /////
+#ifdef __OpenBSD__
+  #define LIBGL_FILENAME "libGL.so"
+#else
+  #define LIBGL_FILENAME "libGL.so.1"
+#endif
+  void *libgl = dlopen(LIBGL_FILENAME, RTLD_LAZY);
+  if (!libgl)
+    fatal_error("Unable to load " LIBGL_FILENAME);
+  
+  typedef void* (* PFNGLXGETPROCADDRESS) (const char *);
+  PFNGLXGETPROCADDRESS glXGetProcAddress = cast<PFNGLXGETPROCADDRESS>(dlsym(libgl, "glXGetProcAddress"));
+  
+  if (!glXGetProcAddress)
+    fatal_error("Unable to find glXGetProcAddress in " LIBGL_FILENAME);
+
+  typedef GLXFBConfig* (* PFNGLXQUERYEXTENSION) (Display *, int *, int *);
+  PFNGLXQUERYEXTENSION glXQueryExtension = cast<PFNGLXQUERYEXTENSION>(glXGetProcAddress("glXQueryExtension"));
+
+  typedef GLXFBConfig* (* PFNGLXQUERYVERSION) (Display *, int *, int *);
+  PFNGLXQUERYVERSION glXQueryVersion = cast<PFNGLXQUERYVERSION>(dlsym(libgl, "glXQueryVersion"));
+
+  typedef XVisualInfo* (* PFNGLXCHOOSEVISUAL) (Display *, int, int *);
+  PFNGLXCHOOSEVISUAL glXChooseVisual = cast<PFNGLXCHOOSEVISUAL>(glXGetProcAddress("glXChooseVisual"));
+
+  typedef GLXContext (* PFNGLXCREATECONTEXT) (Display *, XVisualInfo *, GLXContext, Bool);
+  PFNGLXCREATECONTEXT glXCreateContext = cast<PFNGLXCREATECONTEXT>(glXGetProcAddress("glXCreateContext"));
+
+  typedef Bool (* PFNGLXMAKECURRENT) (Display*, GLXDrawable, GLXContext);
+  PFNGLXMAKECURRENT glXMakeCurrent = cast<PFNGLXMAKECURRENT>(glXGetProcAddress("glXMakeCurrent"));
+
+  typedef void (* PFNGLXDESTROYCONTEXT) (Display*, GLXContext);
+  PFNGLXDESTROYCONTEXT glXDestroyContext = cast<PFNGLXDESTROYCONTEXT>(glXGetProcAddress("glXDestroyContext"));
+
+  typedef GLubyte* (* PFNGLGETSTRING) (GLenum);
+  PFNGLGETSTRING glGetString = cast<PFNGLGETSTRING>(glXGetProcAddress("glGetString"));
+
+  if (!glXQueryExtension ||
+      !glXQueryVersion ||
+      !glXChooseVisual ||
+      !glXCreateContext ||
+      !glXMakeCurrent ||
+      !glXDestroyContext ||
+      !glGetString)
+  {
+    fatal_error("glXGetProcAddress couldn't find required functions");
+  }
+  ///// Open a connection to the X server /////
+  Display *dpy = XOpenDisplay(nullptr);
+  if (!dpy)
+    fatal_error("Unable to open a connection to the X server");
+  
+  ///// Check that the GLX extension is present /////
+  if (!glXQueryExtension(dpy, nullptr, nullptr))
+    fatal_error("GLX extension missing");
+
+  XSetErrorHandler(x_error_handler);
+
+  ///// Get a visual /////
+   int attribs[] = {
+      GLX_RGBA,
+      GLX_RED_SIZE, 1,
+      GLX_GREEN_SIZE, 1,
+      GLX_BLUE_SIZE, 1,
+      None };
+  XVisualInfo *vInfo = glXChooseVisual(dpy, DefaultScreen(dpy), attribs);
+  if (!vInfo)
+    fatal_error("No visuals found");
+
+  // using a X11 Window instead of a GLXPixmap does not crash
+  // fglrx in indirect rendering. bug 680644
+  Window window;
+  XSetWindowAttributes swa;
+  swa.colormap = XCreateColormap(dpy, RootWindow(dpy, vInfo->screen),
+                                 vInfo->visual, AllocNone);
+
+  swa.border_pixel = 0;
+  window = XCreateWindow(dpy, RootWindow(dpy, vInfo->screen),
+                       0, 0, 16, 16,
+                       0, vInfo->depth, InputOutput, vInfo->visual,
+                       CWBorderPixel | CWColormap, &swa);
+
+  ///// Get a GL context and make it current //////
+  GLXContext context = glXCreateContext(dpy, vInfo, nullptr, True);
+  glXMakeCurrent(dpy, window, context);
+
+  ///// Look for this symbol to determine texture_from_pixmap support /////
+  void* glXBindTexImageEXT = glXGetProcAddress("glXBindTexImageEXT"); 
+
+  ///// Get GL vendor/renderer/versions strings /////
+  enum { bufsize = 1024 };
+  char buf[bufsize];
+  const GLubyte *vendorString = glGetString(GL_VENDOR);
+  const GLubyte *rendererString = glGetString(GL_RENDERER);
+  const GLubyte *versionString = glGetString(GL_VERSION);
+
+  if (!vendorString || !rendererString || !versionString)
+    fatal_error("glGetString returned null");
+
+  int length = snprintf(buf, bufsize,
+                        "VENDOR\n%s\nRENDERER\n%s\nVERSION\n%s\nTFP\n%s\n",
+                        vendorString,
+                        rendererString,
+                        versionString,
+                        glXBindTexImageEXT ? "TRUE" : "FALSE");
+  if (length >= bufsize)
+    fatal_error("GL strings length too large for buffer size");
+
+  ///// Clean up. Indeed, the parent process might fail to kill us (e.g. if it doesn't need to check GL info)
+  ///// so we might be staying alive for longer than expected, so it's important to consume as little memory as
+  ///// possible. Also we want to check that we're able to do that too without generating X errors.
+  glXMakeCurrent(dpy, None, nullptr); // must release the GL context before destroying it
+  glXDestroyContext(dpy, context);
+  XDestroyWindow(dpy, window);
+  XFreeColormap(dpy, swa.colormap);
+
+#ifdef NS_FREE_PERMANENT_DATA // conditionally defined in nscore.h, don't forget to #include it above
+  XCloseDisplay(dpy);
+#else
+  // This XSync call wanted to be instead:
+  //   XCloseDisplay(dpy);
+  // but this can cause 1-minute stalls on certain setups using Nouveau, see bug 973192
+  XSync(dpy, False);
+#endif
+
+  dlclose(libgl);
+
+  ///// Finally write data to the pipe
+  mozilla::Unused << write(write_end_of_the_pipe, buf, length);
+}
+
+}
+
+/** \returns true in the child glxtest process, false in the parent process */
+bool fire_glxtest_process()
+{
+  int pfd[2];
+  if (pipe(pfd) == -1) {
+      perror("pipe");
+      return false;
+  }
+#if MOZ_WIDGET_GTK == 2
+  int gtkpfd[2];
+  if (pipe(gtkpfd) == -1) {
+      perror("pipe");
+      return false;
+  }
+#endif
+  pid_t pid = fork();
+  if (pid < 0) {
+      perror("fork");
+      close(pfd[0]);
+      close(pfd[1]);
+#if MOZ_WIDGET_GTK == 2
+      close(gtkpfd[0]);
+      close(gtkpfd[1]);
+#endif
+      return false;
+  }
+  // The child exits early to avoid running the full shutdown sequence and avoid conflicting with threads 
+  // we have already spawned (like the profiler).
+  if (pid == 0) {
+      close(pfd[0]);
+      write_end_of_the_pipe = pfd[1];
+#if MOZ_WIDGET_GTK == 2
+      close(gtkpfd[0]);
+      gtk_write_end_of_the_pipe = gtkpfd[1];
+#endif
+      glxtest();
+      close(pfd[1]);
+#if MOZ_WIDGET_GTK == 2
+      close(gtkpfd[1]);
+#endif
+      _exit(0);
+  }
+
+  close(pfd[1]);
+  mozilla::widget::glxtest_pipe = pfd[0];
+  mozilla::widget::glxtest_pid = pid;
+#if MOZ_WIDGET_GTK == 2
+  close(gtkpfd[1]);
+  gtk_read_end_of_the_pipe = gtkpfd[0];
+#endif
+  return false;
+}