aboutsummaryrefslogtreecommitdiff
path: root/gdb/mingw-hdep.c
blob: 53815b2f683ed8da16b0eb080c04c528a79bf7e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
/* Host support routines for MinGW, for GDB, the GNU debugger.

   Copyright (C) 2006-2024 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "main.h"
#include "serial.h"
#include "gdbsupport/event-loop.h"
#include "gdbsupport/gdb_select.h"
#include "inferior.h"

#include <windows.h>
#include <signal.h>

/* Return an absolute file name of the running GDB, if possible, or
   ARGV0 if not.  The return value is in malloc'ed storage.  */

char *
windows_get_absolute_argv0 (const char *argv0)
{
  char full_name[PATH_MAX];

  if (GetModuleFileName (NULL, full_name, PATH_MAX))
    return xstrdup (full_name);
  return xstrdup (argv0);
}

/* Wrapper for select.  On Windows systems, where the select interface
   only works for sockets, this uses the GDB serial abstraction to
   handle sockets, consoles, pipes, and serial ports.

   The arguments to this function are the same as the traditional
   arguments to select on POSIX platforms.  */

int
gdb_select (int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
	    struct timeval *timeout)
{
  static HANDLE never_handle;
  HANDLE handles[MAXIMUM_WAIT_OBJECTS];
  HANDLE h;
  DWORD event;
  DWORD num_handles;
  /* SCBS contains serial control objects corresponding to file
     descriptors in READFDS and WRITEFDS.  */
  struct serial *scbs[MAXIMUM_WAIT_OBJECTS];
  /* The number of valid entries in SCBS.  */
  size_t num_scbs;
  int fd;
  int num_ready;
  size_t indx;

  if (n == 0)
    {
      /* The MS API says that the first argument to
	 WaitForMultipleObjects cannot be zero.  That's why we just
	 use a regular Sleep here.  */
      if (timeout != NULL)
	Sleep (timeout->tv_sec * 1000 + timeout->tv_usec / 1000);

      return 0;
    }

  num_ready = 0;
  num_handles = 0;
  num_scbs = 0;
  for (fd = 0; fd < n; ++fd)
    {
      HANDLE read = NULL, except = NULL;
      struct serial *scb;

      /* There is no support yet for WRITEFDS.  At present, this isn't
	 used by GDB -- but we do not want to silently ignore WRITEFDS
	 if something starts using it.  */
      gdb_assert (!writefds || !FD_ISSET (fd, writefds));

      if ((!readfds || !FD_ISSET (fd, readfds))
	  && (!exceptfds || !FD_ISSET (fd, exceptfds)))
	continue;

      scb = serial_for_fd (fd);
      if (scb)
	{
	  serial_wait_handle (scb, &read, &except);
	  scbs[num_scbs++] = scb;
	}

      if (read == NULL)
	read = (HANDLE) _get_osfhandle (fd);
      if (except == NULL)
	{
	  if (!never_handle)
	    never_handle = CreateEvent (0, FALSE, FALSE, 0);

	  except = never_handle;
	}

      if (readfds && FD_ISSET (fd, readfds))
	{
	  gdb_assert (num_handles < MAXIMUM_WAIT_OBJECTS);
	  handles[num_handles++] = read;
	}

      if (exceptfds && FD_ISSET (fd, exceptfds))
	{
	  gdb_assert (num_handles < MAXIMUM_WAIT_OBJECTS);
	  handles[num_handles++] = except;
	}
    }

  gdb_assert (num_handles <= MAXIMUM_WAIT_OBJECTS);

  event = WaitForMultipleObjects (num_handles,
				  handles,
				  FALSE,
				  timeout
				  ? (timeout->tv_sec * 1000
				     + timeout->tv_usec / 1000)
				  : INFINITE);
  /* EVENT can only be a value in the WAIT_ABANDONED_0 range if the
     HANDLES included an abandoned mutex.  Since GDB doesn't use
     mutexes, that should never occur.  */
  gdb_assert (!(WAIT_ABANDONED_0 <= event
		&& event < WAIT_ABANDONED_0 + num_handles));
  /* We no longer need the helper threads to check for activity.  */
  for (indx = 0; indx < num_scbs; ++indx)
    serial_done_wait_handle (scbs[indx]);
  if (event == WAIT_FAILED)
    return -1;
  if (event == WAIT_TIMEOUT)
    return 0;
  /* Run through the READFDS, clearing bits corresponding to descriptors
     for which input is unavailable.  */
  h = handles[event - WAIT_OBJECT_0];
  for (fd = 0, indx = 0; fd < n; ++fd)
    {
      HANDLE fd_h;

      if ((!readfds || !FD_ISSET (fd, readfds))
	  && (!exceptfds || !FD_ISSET (fd, exceptfds)))
	continue;

      if (readfds && FD_ISSET (fd, readfds))
	{
	  fd_h = handles[indx++];
	  /* This handle might be ready, even though it wasn't the handle
	     returned by WaitForMultipleObjects.  */
	  if (fd_h != h && WaitForSingleObject (fd_h, 0) != WAIT_OBJECT_0)
	    FD_CLR (fd, readfds);
	  else
	    num_ready++;
	}

      if (exceptfds && FD_ISSET (fd, exceptfds))
	{
	  fd_h = handles[indx++];
	  /* This handle might be ready, even though it wasn't the handle
	     returned by WaitForMultipleObjects.  */
	  if (fd_h != h && WaitForSingleObject (fd_h, 0) != WAIT_OBJECT_0)
	    FD_CLR (fd, exceptfds);
	  else
	    num_ready++;
	}
    }

  return num_ready;
}

/* Map COLOR's RGB triplet, with 8 bits per component, into 16 Windows
   console colors, where each component has just 1 bit, plus a single
   intensity bit which affects all 3 components.  */
static int
rgb_to_16colors (const ui_file_style::color &color)
{
  uint8_t rgb[3];
  color.get_rgb (rgb);

  int retval = 0;
  for (int i = 0; i < 3; i++)
    {
      /* Subdivide 256 possible values of each RGB component into 3
	 regions: no color, normal color, bright color.  256 / 3 = 85,
	 but ui-style.c follows xterm and uses 92 for R and G
	 components of the bright-blue color, so we bias the divisor a
	 bit to have the bright colors between 9 and 15 identical to
	 what ui-style.c expects.  */
      int bits = rgb[i] / 93;
      retval |= ((bits > 0) << (2 - i)) | ((bits > 1) << 3);
    }

  return retval;
}

/* Zero if not yet initialized, 1 if stdout is a console device, else -1.  */
static int mingw_console_initialized;

/* Handle to stdout . */
static HANDLE hstdout = INVALID_HANDLE_VALUE;

/* Text attribute to use for normal text (the "none" pseudo-color).  */
static SHORT  norm_attr;

/* The most recently applied style.  */
static ui_file_style last_style;

/* Alternative for the libc 'fputs' which handles embedded SGR
   sequences in support of styling.  */

int
gdb_console_fputs (const char *linebuf, FILE *fstream)
{
  if (!mingw_console_initialized)
    {
      hstdout = (HANDLE)_get_osfhandle (fileno (fstream));
      DWORD cmode;
      CONSOLE_SCREEN_BUFFER_INFO csbi;

      if (hstdout != INVALID_HANDLE_VALUE
	  && GetConsoleMode (hstdout, &cmode) != 0
	  && GetConsoleScreenBufferInfo (hstdout, &csbi))
	{
	  norm_attr = csbi.wAttributes;
	  mingw_console_initialized = 1;
	}
      else if (hstdout != INVALID_HANDLE_VALUE)
	mingw_console_initialized = -1; /* valid, but not a console device */
    }
  /* If our stdout is not a console device, let the default 'fputs'
     handle the task. */
  if (mingw_console_initialized <= 0)
    return 0;

  /* Mapping between 8 ANSI colors and Windows console attributes.  */
  static int fg_color[] = {
    0,					/* black */
    FOREGROUND_RED,			/* red */
    FOREGROUND_GREEN,			/* green */
    FOREGROUND_GREEN | FOREGROUND_RED,	/* yellow */
    FOREGROUND_BLUE,			/* blue */
    FOREGROUND_BLUE | FOREGROUND_RED,	/* magenta */
    FOREGROUND_BLUE | FOREGROUND_GREEN, /* cyan */
    FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE /* gray */
  };
  static int bg_color[] = {
    0,					/* black */
    BACKGROUND_RED,			/* red */
    BACKGROUND_GREEN,			/* green */
    BACKGROUND_GREEN | BACKGROUND_RED,	/* yellow */
    BACKGROUND_BLUE,			/* blue */
    BACKGROUND_BLUE | BACKGROUND_RED,	/* magenta */
    BACKGROUND_BLUE | BACKGROUND_GREEN, /* cyan */
    BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE /* gray */
  };

  ui_file_style style = last_style;
  unsigned char c;
  size_t n_read;

  for ( ; (c = *linebuf) != 0; linebuf += n_read)
    {
      if (c == '\033')
	{
	  fflush (fstream);
	  bool parsed = style.parse (linebuf, &n_read);
	  if (n_read <= 0)	/* should never happen */
	    n_read = 1;
	  if (!parsed)
	    {
	      /* This means we silently swallow SGR sequences we
		 cannot parse.  */
	      continue;
	    }
	  /* Colors.  */
	  const ui_file_style::color &fg = style.get_foreground ();
	  const ui_file_style::color &bg = style.get_background ();
	  int fgcolor, bgcolor, bright, inverse;
	  if (fg.is_none ())
	    fgcolor = norm_attr & 15;
	  else if (fg.is_basic ())
	    fgcolor = fg_color[fg.get_value () & 15];
	  else
	    fgcolor = rgb_to_16colors (fg);
	  if (bg.is_none ())
	    bgcolor = norm_attr & (15 << 4);
	  else if (bg.is_basic ())
	    bgcolor = bg_color[bg.get_value () & 15];
	  else
	    bgcolor = rgb_to_16colors (bg) << 4;

	  /* Intensity.  */
	  switch (style.get_intensity ())
	    {
	    case ui_file_style::NORMAL:
	    case ui_file_style::DIM:
	      bright = 0;
	      break;
	    case ui_file_style::BOLD:
	      bright = 1;
	      break;
	    default:
	      gdb_assert_not_reached ("invalid intensity");
	    }

	  /* Inverse video.  */
	  if (style.is_reverse ())
	    inverse = 1;
	  else
	    inverse = 0;

	  /* Construct the attribute.  */
	  if (inverse)
	    {
	      int t = fgcolor;
	      fgcolor = (bgcolor >> 4);
	      bgcolor = (t << 4);
	    }
	  if (bright)
	    fgcolor |= FOREGROUND_INTENSITY;

	  SHORT attr = (bgcolor & (15 << 4)) | (fgcolor & 15);

	  /* Apply the attribute.  */
	  SetConsoleTextAttribute (hstdout, attr);
	}
      else
	{
	  /* When we are about to write newline, we need to clear to
	     EOL with the normal attribute, to avoid spilling the
	     colors to the next screen line.  We assume here that no
	     non-default attribute extends beyond the newline.  */
	  if (c == '\n')
	    {
	      DWORD nchars;
	      COORD start_pos;
	      DWORD written;
	      CONSOLE_SCREEN_BUFFER_INFO csbi;

	      fflush (fstream);
	      GetConsoleScreenBufferInfo (hstdout, &csbi);

	      if (csbi.wAttributes != norm_attr)
		{
		  start_pos = csbi.dwCursorPosition;
		  nchars = csbi.dwSize.X - start_pos.X;

		  FillConsoleOutputAttribute (hstdout, norm_attr, nchars,
					      start_pos, &written);
		  FillConsoleOutputCharacter (hstdout, ' ', nchars,
					      start_pos, &written);
		}
	    }
	  fputc (c, fstream);
	  n_read = 1;
	}
    }

  last_style = style;
  return 1;
}

/* See inferior.h.  */

tribool
sharing_input_terminal (int pid)
{
  std::vector<DWORD> results (10);
  DWORD len = 0;
  while (true)
    {
      len = GetConsoleProcessList (results.data (), results.size ());
      /* Note that LEN == 0 is a failure, but we can treat it the same
	 as a "no".  */
      if (len <= results.size ())
	break;

      results.resize (len);
    }
  /* In case the vector was too big.  */
  results.resize (len);
  if (std::find (results.begin (), results.end (), pid) != results.end ())
    {
      /* The pid is in the list sharing the console, so don't
	 interrupt the inferior -- it will get the signal itself.  */
      return TRIBOOL_TRUE;
    }

  return TRIBOOL_FALSE;
}

/* Current C-c handler.  */
static c_c_handler_ftype *current_handler;

/* The Windows callback that forwards requests to the C-c handler.  */
static BOOL WINAPI
ctrl_c_handler (DWORD event_type)
{
  if (event_type == CTRL_BREAK_EVENT || event_type == CTRL_C_EVENT)
    {
      if (current_handler != SIG_IGN)
	current_handler (SIGINT);
    }
  else
    return FALSE;
  return TRUE;
}

/* See inferior.h.  */

c_c_handler_ftype *
install_sigint_handler (c_c_handler_ftype *fn)
{
  /* We want to make sure the gdb handler always comes first, so that
     gdb gets to handle the C-c.  This is why the handler is always
     removed and reinstalled here.  Note that trying to remove the
     function without installing it first will cause a crash.  */
  static bool installed = false;
  if (installed)
    SetConsoleCtrlHandler (ctrl_c_handler, FALSE);
  SetConsoleCtrlHandler (ctrl_c_handler, TRUE);
  installed = true;

  c_c_handler_ftype *result = current_handler;
  current_handler = fn;
  return result;
}