mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
425 lines
10 KiB
C++
425 lines
10 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* ``thrashview'' is a program that reads a binary stream of addresses
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* from stdin and displays the pattern graphically in a window.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <X11/Xlib.h>
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#include <fstream>
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#include <getopt.h>
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#define GET_DISPLAY_FD(display_) ConnectionNumber(display_)
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static bool opt_working_set = false;
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static bool opt_fixed = false;
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static Display *display;
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static Window window;
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static GC gc;
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static XColor colors[256];
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const unsigned int cellsize = 4;
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static unsigned int width = 64 * cellsize;
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static unsigned int height = 64 * cellsize;
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#define PAGESIZE 4096
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#define MAXPAGES 4096 // should hold 16MB worth of code
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static unsigned int minpage = static_cast<unsigned int>(-1);
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static unsigned int maxpage = 0;
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static unsigned char pages[MAXPAGES];
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/**
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* Create a simple window and the X objects we'll need to talk with it.
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*/
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static int
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init()
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{
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display = XOpenDisplay(0);
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if (! display)
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return 0;
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window =
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XCreateSimpleWindow(display,
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RootWindow(display, 0),
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1, 1, width, height,
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0,
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BlackPixel(display, 0),
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BlackPixel(display, 0));
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if (! window)
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return 0;
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gc = XCreateGC(display, window, 0, 0);
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if (! gc)
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return 0;
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// Set up a grayscale
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const unsigned int ncolors = sizeof colors / sizeof colors[0];
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const unsigned short step = 65536 / ncolors;
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unsigned short brightness = 0;
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XColor *color = colors;
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XColor *limit = colors + ncolors;
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for (; color < limit; ++color, brightness += step) {
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color->red = brightness;
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color->green = brightness;
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color->blue = brightness;
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XAllocColor(display, DefaultColormap(display, 0), color);
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}
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// We want exposes and resizes.
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XSelectInput(display, window, ExposureMask | StructureNotifyMask);
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XMapWindow(display, window);
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XFlush(display);
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return 1;
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}
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/**
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* Age pages that haven't been recently touched.
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*/
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static void
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decay()
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{
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int ws_immediate = 0, ws_longterm = 0;
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unsigned char *page = pages;
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unsigned char *limit = pages + (maxpage - minpage) + 1;
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for (; page < limit; ++page) {
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if (opt_working_set) {
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if (*page == 255)
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++ws_immediate;
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if (*page)
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++ws_longterm;
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}
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if (*page) {
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*page /= 8;
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*page *= 7;
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}
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}
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if (opt_working_set) {
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dec(cout);
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cout << "immediate: " << ws_immediate << " pages, ";
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cout << "longterm: " << ws_longterm << " pages, ";
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cout << "mapped: " << ((maxpage - minpage) + 1) << " pages";
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cout << endl;
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}
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}
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/**
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* Blast the state of our pages to the screen.
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*/
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static int
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handle_expose(const XExposeEvent& event)
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{
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//printf("handle_expose(%d, %d, %d, %d)\n", event.x, event.y, event.width, event.height);
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int i = event.x / cellsize;
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int imost = i + event.width / cellsize + 1;
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int j = event.y / cellsize;
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int jmost = j + event.height / cellsize + 1;
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unsigned char *last_cell = pages + maxpage - minpage;
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unsigned char *row = pages + j;
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for (int y = j * cellsize, ymost = jmost * cellsize;
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y < ymost;
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y += cellsize, row += width / cellsize) {
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unsigned char *cell = row + i;
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for (int x = i * cellsize, xmost = imost * cellsize;
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x < xmost;
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x += cellsize, ++cell) {
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unsigned int pixel = (cell <= last_cell) ? colors[*cell].pixel : colors[0].pixel;
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XSetForeground(display, gc, pixel);
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XFillRectangle(display, window, gc, x, y, cellsize - 1, cellsize - 1);
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}
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}
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XFlush(display);
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return 1;
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}
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/**
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* Invalidate the entire window.
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*/
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static void
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invalidate_window()
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{
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XExposeEvent event;
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event.x = event.y = 0;
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event.width = width;
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event.height = height;
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handle_expose(event);
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}
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/**
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* Handle a configure event.
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*/
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static int
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handle_configure(const XConfigureEvent& event)
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{
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//printf("handle_resize(%d, %d)\n", event.width, event.height);
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width = event.width - event.width % cellsize;
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height = event.height;
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return 1;
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}
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/**
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* Filter to select any message.
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*/
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static Bool
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any_event(Display *display, XEvent *event, XPointer arg)
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{
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return 1;
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}
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/**
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* An X event occurred. Process it and flush the queue.
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*/
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static int
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handle_xevents()
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{
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int ok;
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XEvent event;
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XNextEvent(display, &event);
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do {
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switch (event.type) {
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case Expose:
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ok = handle_expose(reinterpret_cast<const XExposeEvent&>(event));
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break;
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case ConfigureNotify:
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ok = handle_configure(reinterpret_cast<const XConfigureEvent&>(event));
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break;
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default:
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ok = 1;
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}
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} while (ok && XCheckIfEvent(display, &event, any_event, 0));
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return ok;
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}
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/**
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* Read address data from stdin.
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*/
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static int
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read_addrs()
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{
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unsigned int buf[1024];
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ssize_t count;
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while ((count = read(0, buf, sizeof buf)) > 0) {
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if (count % sizeof(unsigned int))
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cerr << "truncating unaligned read" << endl;
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count /= sizeof buf[0];
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unsigned int *addr = reinterpret_cast<unsigned int *>(buf);
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unsigned int *limit = addr + count;
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for (; addr < limit; ++addr) {
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// map the address to a page
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unsigned int page = *addr / PAGESIZE;
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// XXX Don't let stray addresses bring us down. Should
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// really fix this by knowing what the ranges of addresses
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// we ought to expect are (e.g., by reading the symtab)
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if (maxpage && page > maxpage && page - maxpage > MAXPAGES)
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continue;
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if (! opt_fixed) {
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// Potentially adjust minpage and maxpage to
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// accomodate an out-of-bounds address.
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if (page < minpage) {
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if (maxpage) {
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// everything needs to shift.
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unsigned int shift = minpage - page;
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memmove(pages + shift, pages, maxpage - minpage);
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memset(pages, 0, shift);
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}
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minpage = page;
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}
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if (page > maxpage)
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maxpage = page;
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}
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page -= minpage;
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pages[page] = 255;
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}
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}
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if (count < 0 && errno != EWOULDBLOCK) {
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perror("read");
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return 0;
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}
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return 1;
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}
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/**
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* Run the program
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*/
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static void
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run()
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{
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// We want non-blocking I/O on stdin so we can select on it.
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fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK);
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// The last time we refreshed the window.
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struct timeval last;
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gettimeofday(&last, 0);
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int ok;
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do {
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// Select on stdin and the connection to the X server.
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(STDIN_FILENO, &fds);
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FD_SET(GET_DISPLAY_FD(display), &fds);
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struct timeval tv;
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tv.tv_sec = 1;
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tv.tv_usec = 0;
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ok = select(GET_DISPLAY_FD(display) + 1, &fds, 0, 0, &tv);
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if (ok < 0)
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break;
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if (maxpage) {
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// See if we've waited long enough to refresh the window.
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struct timeval now;
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gettimeofday(&now, 0);
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if (now.tv_sec != last.tv_sec) {
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// At least a second has gone by. Decay and refresh.
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last = now;
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decay();
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invalidate_window();
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}
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else if (now.tv_usec - last.tv_usec > 100000) {
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// At least 100msec have gone by. Refresh.
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last.tv_usec = now.tv_usec;
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invalidate_window();
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}
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}
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// Now check for X events and input.
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ok = 1;
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if (FD_ISSET(GET_DISPLAY_FD(display), &fds))
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ok = handle_xevents();
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if (FD_ISSET(STDIN_FILENO, &fds))
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ok = read_addrs();
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} while (ok);
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}
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/**
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* Tear down our window and stuff.
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*/
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static void
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finish()
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{
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if (window) {
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XUnmapWindow(display, window);
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XDestroyWindow(display, window);
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}
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if (display)
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XCloseDisplay(display);
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}
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static struct option opts[] = {
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{ "working-set", no_argument, 0, 'w' },
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{ "min", required_argument, 0, 'm' },
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{ "size", required_argument, 0, 's' },
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{ "max", required_argument, 0, 'x' },
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{ 0, 0, 0, 0 }
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};
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static void
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usage()
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{
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cerr << "thrashview [--working-set] [--min=<min>] [--max=<max>] [--size=<size>]" << endl;
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}
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/**
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* Program starts here.
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*/
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int
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main(int argc, char *argv[])
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{
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int size = 0;
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while (1) {
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int option_index = 0;
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int c = getopt_long(argc, argv, "wm:x:s:", opts, &option_index);
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if (c < 0)
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break;
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switch (c) {
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case 'w':
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opt_working_set = true;
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break;
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case 'm':
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minpage = strtol(optarg, 0, 0) / PAGESIZE;
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opt_fixed = true;
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break;
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case 's':
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size = strtol(optarg, 0, 0) / PAGESIZE;
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break;
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case 'x':
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maxpage = strtol(optarg, 0, 0) / PAGESIZE;
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opt_fixed = true;
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break;
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default:
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usage();
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return 1;
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}
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}
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if (minpage && !maxpage) {
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if (!size) {
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cerr << argv[0] << ": minpage specified without maxpage or size" << endl;
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return 1;
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}
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maxpage = minpage + size;
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}
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if (opt_fixed && minpage > maxpage) {
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cerr << argv[0] << ": invalid page range" << endl;
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return 1;
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}
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if (init())
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run();
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finish();
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return 0;
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}
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