[deliverable/binutils-gdb.git] / gdb / btrace.c

/* Branch trace support for GDB, the GNU debugger.

   Copyright (C) 2013-2014 Free Software Foundation, Inc.

   Contributed by Intel Corp. <markus.t.metzger@intel.com>

   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 "btrace.h"
#include "gdbthread.h"
#include "exceptions.h"
#include "inferior.h"
#include "target.h"
#include "record.h"
#include "symtab.h"
#include "disasm.h"
#include "source.h"
#include "filenames.h"
#include "xml-support.h"

/* Print a record debug message.  Use do ... while (0) to avoid ambiguities
   when used in if statements.  */

#define DEBUG(msg, args...)						\
  do									\
    {									\
      if (record_debug != 0)						\
        fprintf_unfiltered (gdb_stdlog,					\
			    "[btrace] " msg "\n", ##args);		\
    }									\
  while (0)

#define DEBUG_FTRACE(msg, args...) DEBUG ("[ftrace] " msg, ##args)

/* Initialize the instruction iterator.  */

static void
btrace_init_insn_iterator (struct btrace_thread_info *btinfo)
{
  DEBUG ("init insn iterator");

  btinfo->insn_iterator.begin = 1;
  btinfo->insn_iterator.end = 0;
}

/* Initialize the function iterator.  */

static void
btrace_init_func_iterator (struct btrace_thread_info *btinfo)
{
  DEBUG ("init func iterator");

  btinfo->func_iterator.begin = 1;
  btinfo->func_iterator.end = 0;
}

/* Compute the instruction trace from the block trace.  */

static VEC (btrace_inst_s) *
compute_itrace (VEC (btrace_block_s) *btrace)
{
  VEC (btrace_inst_s) *itrace;
  struct gdbarch *gdbarch;
  unsigned int b;

  DEBUG ("compute itrace");

  itrace = NULL;
  gdbarch = target_gdbarch ();
  b = VEC_length (btrace_block_s, btrace);

  while (b-- != 0)
    {
      btrace_block_s *block;
      CORE_ADDR pc;

      block = VEC_index (btrace_block_s, btrace, b);
      pc = block->begin;

      /* Add instructions for this block.  */
      for (;;)
	{
	  btrace_inst_s *inst;
	  int size;

	  /* We should hit the end of the block.  Warn if we went too far.  */
	  if (block->end < pc)
	    {
	      warning (_("Recorded trace may be corrupted."));
	      break;
	    }

	  inst = VEC_safe_push (btrace_inst_s, itrace, NULL);
	  inst->pc = pc;

	  /* We're done once we pushed the instruction at the end.  */
	  if (block->end == pc)
	    break;

	  size = gdb_insn_length (gdbarch, pc);

	  /* Make sure we terminate if we fail to compute the size.  */
	  if (size <= 0)
	    {
	      warning (_("Recorded trace may be incomplete."));
	      break;
	    }

	  pc += size;
	}
    }

  return itrace;
}

/* Return the function name of a recorded function segment for printing.
   This function never returns NULL.  */

static const char *
ftrace_print_function_name (struct btrace_func *bfun)
{
  struct minimal_symbol *msym;
  struct symbol *sym;

  msym = bfun->msym;
  sym = bfun->sym;

  if (sym != NULL)
    return SYMBOL_PRINT_NAME (sym);

  if (msym != NULL)
    return SYMBOL_PRINT_NAME (msym);

  return "<unknown>";
}

/* Return the file name of a recorded function segment for printing.
   This function never returns NULL.  */

static const char *
ftrace_print_filename (struct btrace_func *bfun)
{
  struct symbol *sym;
  const char *filename;

  sym = bfun->sym;

  if (sym != NULL)
    filename = symtab_to_filename_for_display (sym->symtab);
  else
    filename = "<unknown>";

  return filename;
}

/* Print an ftrace debug status message.  */

static void
ftrace_debug (struct btrace_func *bfun, const char *prefix)
{
  DEBUG_FTRACE ("%s: fun = %s, file = %s, lines = [%d; %d], insn = [%u; %u]",
		prefix, ftrace_print_function_name (bfun),
		ftrace_print_filename (bfun), bfun->lbegin, bfun->lend,
		bfun->ibegin, bfun->iend);
}

/* Initialize a recorded function segment.  */

static void
ftrace_init_func (struct btrace_func *bfun, struct minimal_symbol *mfun,
		  struct symbol *fun, unsigned int idx)
{
  bfun->msym = mfun;
  bfun->sym = fun;
  bfun->lbegin = INT_MAX;
  bfun->lend = 0;
  bfun->ibegin = idx;
  bfun->iend = idx;
}

/* Check whether the function has changed.  */

static int
ftrace_function_switched (struct btrace_func *bfun,
			  struct minimal_symbol *mfun, struct symbol *fun)
{
  struct minimal_symbol *msym;
  struct symbol *sym;

  /* The function changed if we did not have one before.  */
  if (bfun == NULL)
    return 1;

  msym = bfun->msym;
  sym = bfun->sym;

  /* If the minimal symbol changed, we certainly switched functions.  */
  if (mfun != NULL && msym != NULL
      && strcmp (SYMBOL_LINKAGE_NAME (mfun), SYMBOL_LINKAGE_NAME (msym)) != 0)
    return 1;

  /* If the symbol changed, we certainly switched functions.  */
  if (fun != NULL && sym != NULL)
    {
      const char *bfname, *fname;

      /* Check the function name.  */
      if (strcmp (SYMBOL_LINKAGE_NAME (fun), SYMBOL_LINKAGE_NAME (sym)) != 0)
	return 1;

      /* Check the location of those functions, as well.  */
      bfname = symtab_to_fullname (sym->symtab);
      fname = symtab_to_fullname (fun->symtab);
      if (filename_cmp (fname, bfname) != 0)
	return 1;
    }

  return 0;
}

/* Check if we should skip this file when generating the function call
   history.  We would want to do that if, say, a macro that is defined
   in another file is expanded in this function.  */

static int
ftrace_skip_file (struct btrace_func *bfun, const char *filename)
{
  struct symbol *sym;
  const char *bfile;

  sym = bfun->sym;

  if (sym != NULL)
    bfile = symtab_to_fullname (sym->symtab);
  else
    bfile = "";

  if (filename == NULL)
    filename = "";

  return (filename_cmp (bfile, filename) != 0);
}

/* Compute the function trace from the instruction trace.  */

static VEC (btrace_func_s) *
compute_ftrace (VEC (btrace_inst_s) *itrace)
{
  VEC (btrace_func_s) *ftrace;
  struct btrace_inst *binst;
  struct btrace_func *bfun;
  unsigned int idx;

  DEBUG ("compute ftrace");

  ftrace = NULL;
  bfun = NULL;

  for (idx = 0; VEC_iterate (btrace_inst_s, itrace, idx, binst); ++idx)
    {
      struct symtab_and_line sal;
      struct bound_minimal_symbol mfun;
      struct symbol *fun;
      const char *filename;
      CORE_ADDR pc;

      pc = binst->pc;

      /* Try to determine the function we're in.  We use both types of symbols
	 to avoid surprises when we sometimes get a full symbol and sometimes
	 only a minimal symbol.  */
      fun = find_pc_function (pc);
      mfun = lookup_minimal_symbol_by_pc (pc);

      if (fun == NULL && mfun.minsym == NULL)
	{
	  DEBUG_FTRACE ("no symbol at %u, pc=%s", idx,
			core_addr_to_string_nz (pc));
	  continue;
	}

      /* If we're switching functions, we start over.  */
      if (ftrace_function_switched (bfun, mfun.minsym, fun))
	{
	  bfun = VEC_safe_push (btrace_func_s, ftrace, NULL);

	  ftrace_init_func (bfun, mfun.minsym, fun, idx);
	  ftrace_debug (bfun, "init");
	}

      /* Update the instruction range.  */
      bfun->iend = idx;
      ftrace_debug (bfun, "update insns");

      /* Let's see if we have source correlation, as well.  */
      sal = find_pc_line (pc, 0);
      if (sal.symtab == NULL || sal.line == 0)
	{
	  DEBUG_FTRACE ("no lines at %u, pc=%s", idx,
			core_addr_to_string_nz (pc));
	  continue;
	}

      /* Check if we switched files.  This could happen if, say, a macro that
	 is defined in another file is expanded here.  */
      filename = symtab_to_fullname (sal.symtab);
      if (ftrace_skip_file (bfun, filename))
	{
	  DEBUG_FTRACE ("ignoring file at %u, pc=%s, file=%s", idx,
			core_addr_to_string_nz (pc), filename);
	  continue;
	}

      /* Update the line range.  */
      bfun->lbegin = min (bfun->lbegin, sal.line);
      bfun->lend = max (bfun->lend, sal.line);
      ftrace_debug (bfun, "update lines");
    }

  return ftrace;
}

/* See btrace.h.  */

void
btrace_enable (struct thread_info *tp)
{
  if (tp->btrace.target != NULL)
    return;

  if (!target_supports_btrace ())
    error (_("Target does not support branch tracing."));

  DEBUG ("enable thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));

  tp->btrace.target = target_enable_btrace (tp->ptid);
}

/* See btrace.h.  */

void
btrace_disable (struct thread_info *tp)
{
  struct btrace_thread_info *btp = &tp->btrace;
  int errcode = 0;

  if (btp->target == NULL)
    return;

  DEBUG ("disable thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));

  target_disable_btrace (btp->target);
  btp->target = NULL;

  btrace_clear (tp);
}

/* See btrace.h.  */

void
btrace_teardown (struct thread_info *tp)
{
  struct btrace_thread_info *btp = &tp->btrace;
  int errcode = 0;

  if (btp->target == NULL)
    return;

  DEBUG ("teardown thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));

  target_teardown_btrace (btp->target);
  btp->target = NULL;

  btrace_clear (tp);
}

/* See btrace.h.  */

void
btrace_fetch (struct thread_info *tp)
{
  struct btrace_thread_info *btinfo;
  VEC (btrace_block_s) *btrace;

  DEBUG ("fetch thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));

  btinfo = &tp->btrace;
  if (btinfo->target == NULL)
    return;

  btrace = target_read_btrace (btinfo->target, btrace_read_new);
  if (VEC_empty (btrace_block_s, btrace))
    return;

  btrace_clear (tp);

  btinfo->btrace = btrace;
  btinfo->itrace = compute_itrace (btinfo->btrace);
  btinfo->ftrace = compute_ftrace (btinfo->itrace);

  /* Initialize branch trace iterators.  */
  btrace_init_insn_iterator (btinfo);
  btrace_init_func_iterator (btinfo);
}

/* See btrace.h.  */

void
btrace_clear (struct thread_info *tp)
{
  struct btrace_thread_info *btinfo;

  DEBUG ("clear thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));

  btinfo = &tp->btrace;

  VEC_free (btrace_block_s, btinfo->btrace);
  VEC_free (btrace_inst_s, btinfo->itrace);
  VEC_free (btrace_func_s, btinfo->ftrace);

  btinfo->btrace = NULL;
  btinfo->itrace = NULL;
  btinfo->ftrace = NULL;
}

/* See btrace.h.  */

void
btrace_free_objfile (struct objfile *objfile)
{
  struct thread_info *tp;

  DEBUG ("free objfile");

  ALL_THREADS (tp)
    btrace_clear (tp);
}

#if defined (HAVE_LIBEXPAT)

/* Check the btrace document version.  */

static void
check_xml_btrace_version (struct gdb_xml_parser *parser,
			  const struct gdb_xml_element *element,
			  void *user_data, VEC (gdb_xml_value_s) *attributes)
{
  const char *version = xml_find_attribute (attributes, "version")->value;

  if (strcmp (version, "1.0") != 0)
    gdb_xml_error (parser, _("Unsupported btrace version: \"%s\""), version);
}

/* Parse a btrace "block" xml record.  */

static void
parse_xml_btrace_block (struct gdb_xml_parser *parser,
			const struct gdb_xml_element *element,
			void *user_data, VEC (gdb_xml_value_s) *attributes)
{
  VEC (btrace_block_s) **btrace;
  struct btrace_block *block;
  ULONGEST *begin, *end;

  btrace = user_data;
  block = VEC_safe_push (btrace_block_s, *btrace, NULL);

  begin = xml_find_attribute (attributes, "begin")->value;
  end = xml_find_attribute (attributes, "end")->value;

  block->begin = *begin;
  block->end = *end;
}

static const struct gdb_xml_attribute block_attributes[] = {
  { "begin", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
  { "end", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
};

static const struct gdb_xml_attribute btrace_attributes[] = {
  { "version", GDB_XML_AF_NONE, NULL, NULL },
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
};

static const struct gdb_xml_element btrace_children[] = {
  { "block", block_attributes, NULL,
    GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, parse_xml_btrace_block, NULL },
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};

static const struct gdb_xml_element btrace_elements[] = {
  { "btrace", btrace_attributes, btrace_children, GDB_XML_EF_NONE,
    check_xml_btrace_version, NULL },
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};

#endif /* defined (HAVE_LIBEXPAT) */

/* See btrace.h.  */

VEC (btrace_block_s) *
parse_xml_btrace (const char *buffer)
{
  VEC (btrace_block_s) *btrace = NULL;
  struct cleanup *cleanup;
  int errcode;

#if defined (HAVE_LIBEXPAT)

  cleanup = make_cleanup (VEC_cleanup (btrace_block_s), &btrace);
  errcode = gdb_xml_parse_quick (_("btrace"), "btrace.dtd", btrace_elements,
				 buffer, &btrace);
  if (errcode != 0)
    {
      do_cleanups (cleanup);
      return NULL;
    }

  /* Keep parse results.  */
  discard_cleanups (cleanup);

#else  /* !defined (HAVE_LIBEXPAT) */

  error (_("Cannot process branch trace.  XML parsing is not supported."));

#endif  /* !defined (HAVE_LIBEXPAT) */

  return btrace;
}
Commit	Line	Data
02d27625 MM	1	/* Branch trace support for GDB, the GNU debugger.
02d27625 MM	2
ecd75fc8	3	Copyright (C) 2013-2014 Free Software Foundation, Inc.
02d27625 MM	4
	5	Contributed by Intel Corp. <markus.t.metzger@intel.com>
	6
	7	This file is part of GDB.
	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 3 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	21
	22	#include "btrace.h"
	23	#include "gdbthread.h"
	24	#include "exceptions.h"
	25	#include "inferior.h"
	26	#include "target.h"
	27	#include "record.h"
	28	#include "symtab.h"
	29	#include "disasm.h"
	30	#include "source.h"
	31	#include "filenames.h"
c12a2917	32	#include "xml-support.h"
02d27625 MM	33
	34	/* Print a record debug message. Use do ... while (0) to avoid ambiguities
	35	when used in if statements. */
	36
	37	#define DEBUG(msg, args...) \
	38	do \
	39	{ \
	40	if (record_debug != 0) \
	41	fprintf_unfiltered (gdb_stdlog, \
	42	"[btrace] " msg "\n", ##args); \
	43	} \
	44	while (0)
	45
	46	#define DEBUG_FTRACE(msg, args...) DEBUG ("[ftrace] " msg, ##args)
	47
	48	/* Initialize the instruction iterator. */
	49
	50	static void
	51	btrace_init_insn_iterator (struct btrace_thread_info *btinfo)
	52	{
	53	DEBUG ("init insn iterator");
	54
	55	btinfo->insn_iterator.begin = 1;
	56	btinfo->insn_iterator.end = 0;
	57	}
	58
	59	/* Initialize the function iterator. */
	60
	61	static void
	62	btrace_init_func_iterator (struct btrace_thread_info *btinfo)
	63	{
	64	DEBUG ("init func iterator");
	65
	66	btinfo->func_iterator.begin = 1;
	67	btinfo->func_iterator.end = 0;
	68	}
	69
	70	/* Compute the instruction trace from the block trace. */
	71
	72	static VEC (btrace_inst_s) *
	73	compute_itrace (VEC (btrace_block_s) *btrace)
	74	{
	75	VEC (btrace_inst_s) *itrace;
	76	struct gdbarch *gdbarch;
	77	unsigned int b;
	78
	79	DEBUG ("compute itrace");
	80
	81	itrace = NULL;
	82	gdbarch = target_gdbarch ();
	83	b = VEC_length (btrace_block_s, btrace);
	84
	85	while (b-- != 0)
	86	{
	87	btrace_block_s *block;
	88	CORE_ADDR pc;
	89
	90	block = VEC_index (btrace_block_s, btrace, b);
	91	pc = block->begin;
	92
	93	/* Add instructions for this block. */
	94	for (;;)
	95	{
	96	btrace_inst_s *inst;
97	int size;
98
99	/* We should hit the end of the block. Warn if we went too far. */
100	if (block->end < pc)
101	{
102	warning (_("Recorded trace may be corrupted."));
103	break;
104	}
105
106	inst = VEC_safe_push (btrace_inst_s, itrace, NULL);
107	inst->pc = pc;
108
109	/* We're done once we pushed the instruction at the end. */
110	if (block->end == pc)
111	break;
112
113	size = gdb_insn_length (gdbarch, pc);
114
115	/* Make sure we terminate if we fail to compute the size. */
116	if (size <= 0)
117	{
118	warning (_("Recorded trace may be incomplete."));
119	break;
120	}
121
122	pc += size;
123	}
124	}
125
126	return itrace;
127	}
128
129	/* Return the function name of a recorded function segment for printing.
130	This function never returns NULL. */
131
132	static const char *
133	ftrace_print_function_name (struct btrace_func *bfun)
134	{
135	struct minimal_symbol *msym;
136	struct symbol *sym;
137
138	msym = bfun->msym;
139	sym = bfun->sym;
140
141	if (sym != NULL)
142	return SYMBOL_PRINT_NAME (sym);
143
144	if (msym != NULL)
145	return SYMBOL_PRINT_NAME (msym);
146
147	return "<unknown>";
148	}
149
150	/* Return the file name of a recorded function segment for printing.
151	This function never returns NULL. */
152
153	static const char *
154	ftrace_print_filename (struct btrace_func *bfun)
155	{
156	struct symbol *sym;
157	const char *filename;
158
159	sym = bfun->sym;
160
161	if (sym != NULL)
162	filename = symtab_to_filename_for_display (sym->symtab);
163	else
164	filename = "<unknown>";
165
166	return filename;
167	}
168
169	/* Print an ftrace debug status message. */
170
171	static void
172	ftrace_debug (struct btrace_func bfun, const char prefix)
173	{
174	DEBUG_FTRACE ("%s: fun = %s, file = %s, lines = [%d; %d], insn = [%u; %u]",
175	prefix, ftrace_print_function_name (bfun),
176	ftrace_print_filename (bfun), bfun->lbegin, bfun->lend,
177	bfun->ibegin, bfun->iend);
178	}
179
180	/* Initialize a recorded function segment. */
181
182	static void
183	ftrace_init_func (struct btrace_func bfun, struct minimal_symbol mfun,
184	struct symbol *fun, unsigned int idx)
185	{
186	bfun->msym = mfun;
187	bfun->sym = fun;
188	bfun->lbegin = INT_MAX;
189	bfun->lend = 0;
190	bfun->ibegin = idx;
191	bfun->iend = idx;
192	}
193
194	/* Check whether the function has changed. */
195
196	static int
197	ftrace_function_switched (struct btrace_func *bfun,
198	struct minimal_symbol mfun, struct symbol fun)
199	{
200	struct minimal_symbol *msym;
201	struct symbol *sym;
202
203	/* The function changed if we did not have one before. */
204	if (bfun == NULL)
205	return 1;
206
207	msym = bfun->msym;
208	sym = bfun->sym;
209
210	/* If the minimal symbol changed, we certainly switched functions. */
211	if (mfun != NULL && msym != NULL
212	&& strcmp (SYMBOL_LINKAGE_NAME (mfun), SYMBOL_LINKAGE_NAME (msym)) != 0)
213	return 1;
214
215	/* If the symbol changed, we certainly switched functions. */
216	if (fun != NULL && sym != NULL)
217	{
218	const char bfname, fname;
219
220	/* Check the function name. */
221	if (strcmp (SYMBOL_LINKAGE_NAME (fun), SYMBOL_LINKAGE_NAME (sym)) != 0)
222	return 1;
223
224	/* Check the location of those functions, as well. */
225	bfname = symtab_to_fullname (sym->symtab);
226	fname = symtab_to_fullname (fun->symtab);
227	if (filename_cmp (fname, bfname) != 0)
228	return 1;
229	}
230
231	return 0;
232	}
233
234	/* Check if we should skip this file when generating the function call
235	history. We would want to do that if, say, a macro that is defined
236	in another file is expanded in this function. */
237
238	static int
239	ftrace_skip_file (struct btrace_func bfun, const char filename)
240	{
241	struct symbol *sym;
242	const char *bfile;
243
244	sym = bfun->sym;
245
246	if (sym != NULL)
247	bfile = symtab_to_fullname (sym->symtab);
248	else
249	bfile = "";
250
251	if (filename == NULL)
252	filename = "";
253
254	return (filename_cmp (bfile, filename) != 0);
255	}
256
257	/* Compute the function trace from the instruction trace. */
258
259	static VEC (btrace_func_s) *
260	compute_ftrace (VEC (btrace_inst_s) *itrace)
261	{
262	VEC (btrace_func_s) *ftrace;
263	struct btrace_inst *binst;
264	struct btrace_func *bfun;
265	unsigned int idx;
266
267	DEBUG ("compute ftrace");
268
269	ftrace = NULL;
270	bfun = NULL;
271
272	for (idx = 0; VEC_iterate (btrace_inst_s, itrace, idx, binst); ++idx)
273	{
274	struct symtab_and_line sal;
7cbd4a93	275	struct bound_minimal_symbol mfun;
02d27625 MM	276	struct symbol *fun;
	277	const char *filename;
	278	CORE_ADDR pc;
	279
	280	pc = binst->pc;
	281
	282	/* Try to determine the function we're in. We use both types of symbols
	283	to avoid surprises when we sometimes get a full symbol and sometimes
	284	only a minimal symbol. */
	285	fun = find_pc_function (pc);
	286	mfun = lookup_minimal_symbol_by_pc (pc);
	287
7cbd4a93	288	if (fun == NULL && mfun.minsym == NULL)
02d27625 MM	289	{
	290	DEBUG_FTRACE ("no symbol at %u, pc=%s", idx,
	291	core_addr_to_string_nz (pc));
	292	continue;
	293	}
	294
	295	/* If we're switching functions, we start over. */
7cbd4a93	296	if (ftrace_function_switched (bfun, mfun.minsym, fun))
02d27625 MM	297	{
	298	bfun = VEC_safe_push (btrace_func_s, ftrace, NULL);
	299
7cbd4a93	300	ftrace_init_func (bfun, mfun.minsym, fun, idx);
02d27625 MM	301	ftrace_debug (bfun, "init");
	302	}
	303
	304	/* Update the instruction range. */
	305	bfun->iend = idx;
	306	ftrace_debug (bfun, "update insns");
	307
	308	/* Let's see if we have source correlation, as well. */
	309	sal = find_pc_line (pc, 0);
	310	if (sal.symtab == NULL \|\| sal.line == 0)
	311	{
	312	DEBUG_FTRACE ("no lines at %u, pc=%s", idx,
	313	core_addr_to_string_nz (pc));
	314	continue;
	315	}
	316
	317	/* Check if we switched files. This could happen if, say, a macro that
	318	is defined in another file is expanded here. */
	319	filename = symtab_to_fullname (sal.symtab);
	320	if (ftrace_skip_file (bfun, filename))
	321	{
	322	DEBUG_FTRACE ("ignoring file at %u, pc=%s, file=%s", idx,
	323	core_addr_to_string_nz (pc), filename);
	324	continue;
	325	}
	326
	327	/* Update the line range. */
	328	bfun->lbegin = min (bfun->lbegin, sal.line);
	329	bfun->lend = max (bfun->lend, sal.line);
	330	ftrace_debug (bfun, "update lines");
	331	}
	332
	333	return ftrace;
	334	}
	335
	336	/* See btrace.h. */
	337
	338	void
	339	btrace_enable (struct thread_info *tp)
	340	{
	341	if (tp->btrace.target != NULL)
	342	return;
	343
	344	if (!target_supports_btrace ())
	345	error (_("Target does not support branch tracing."));
	346
	347	DEBUG ("enable thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
	348
	349	tp->btrace.target = target_enable_btrace (tp->ptid);
	350	}
	351
	352	/* See btrace.h. */
	353
	354	void
	355	btrace_disable (struct thread_info *tp)
	356	{
	357	struct btrace_thread_info *btp = &tp->btrace;
	358	int errcode = 0;
	359
	360	if (btp->target == NULL)
	361	return;
	362
	363	DEBUG ("disable thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
	364
365	target_disable_btrace (btp->target);
366	btp->target = NULL;
367
368	btrace_clear (tp);
369	}
370
371	/* See btrace.h. */
372
373	void
374	btrace_teardown (struct thread_info *tp)
375	{
376	struct btrace_thread_info *btp = &tp->btrace;
377	int errcode = 0;
378
379	if (btp->target == NULL)
380	return;
381
382	DEBUG ("teardown thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
383
384	target_teardown_btrace (btp->target);
385	btp->target = NULL;
386
387	btrace_clear (tp);
388	}
389
390	/* See btrace.h. */
391
392	void
393	btrace_fetch (struct thread_info *tp)
394	{
395	struct btrace_thread_info *btinfo;
396	VEC (btrace_block_s) *btrace;
397
398	DEBUG ("fetch thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
399
400	btinfo = &tp->btrace;
401	if (btinfo->target == NULL)
402	return;
403
404	btrace = target_read_btrace (btinfo->target, btrace_read_new);
405	if (VEC_empty (btrace_block_s, btrace))
406	return;
407
408	btrace_clear (tp);
409
410	btinfo->btrace = btrace;
411	btinfo->itrace = compute_itrace (btinfo->btrace);
412	btinfo->ftrace = compute_ftrace (btinfo->itrace);
413
414	/* Initialize branch trace iterators. */
415	btrace_init_insn_iterator (btinfo);
416	btrace_init_func_iterator (btinfo);
417	}
418
419	/* See btrace.h. */
420
421	void
422	btrace_clear (struct thread_info *tp)
423	{
424	struct btrace_thread_info *btinfo;
425
426	DEBUG ("clear thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
427
428	btinfo = &tp->btrace;
429
430	VEC_free (btrace_block_s, btinfo->btrace);
431	VEC_free (btrace_inst_s, btinfo->itrace);
432	VEC_free (btrace_func_s, btinfo->ftrace);
433
434	btinfo->btrace = NULL;
435	btinfo->itrace = NULL;
436	btinfo->ftrace = NULL;
437	}
438
439	/* See btrace.h. */
440
441	void
442	btrace_free_objfile (struct objfile *objfile)
443	{
444	struct thread_info *tp;
445
446	DEBUG ("free objfile");
447
448	ALL_THREADS (tp)
449	btrace_clear (tp);
450	}
c12a2917 MM	451
	452	#if defined (HAVE_LIBEXPAT)
	453
	454	/* Check the btrace document version. */
	455
	456	static void
	457	check_xml_btrace_version (struct gdb_xml_parser *parser,
	458	const struct gdb_xml_element *element,
	459	void user_data, VEC (gdb_xml_value_s) attributes)
	460	{
	461	const char *version = xml_find_attribute (attributes, "version")->value;
	462
	463	if (strcmp (version, "1.0") != 0)
	464	gdb_xml_error (parser, _("Unsupported btrace version: \"%s\""), version);
	465	}
	466
	467	/* Parse a btrace "block" xml record. */
	468
	469	static void
	470	parse_xml_btrace_block (struct gdb_xml_parser *parser,
	471	const struct gdb_xml_element *element,
	472	void user_data, VEC (gdb_xml_value_s) attributes)
	473	{
	474	VEC (btrace_block_s) **btrace;
	475	struct btrace_block *block;
	476	ULONGEST begin, end;
	477
	478	btrace = user_data;
	479	block = VEC_safe_push (btrace_block_s, *btrace, NULL);
	480
	481	begin = xml_find_attribute (attributes, "begin")->value;
	482	end = xml_find_attribute (attributes, "end")->value;
	483
	484	block->begin = *begin;
	485	block->end = *end;
	486	}
	487
	488	static const struct gdb_xml_attribute block_attributes[] = {
	489	{ "begin", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
	490	{ "end", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
	491	{ NULL, GDB_XML_AF_NONE, NULL, NULL }
	492	};
	493
	494	static const struct gdb_xml_attribute btrace_attributes[] = {
	495	{ "version", GDB_XML_AF_NONE, NULL, NULL },
	496	{ NULL, GDB_XML_AF_NONE, NULL, NULL }
	497	};
	498
	499	static const struct gdb_xml_element btrace_children[] = {
	500	{ "block", block_attributes, NULL,
	501	GDB_XML_EF_REPEATABLE \| GDB_XML_EF_OPTIONAL, parse_xml_btrace_block, NULL },
	502	{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
	503	};
	504
	505	static const struct gdb_xml_element btrace_elements[] = {
	506	{ "btrace", btrace_attributes, btrace_children, GDB_XML_EF_NONE,
	507	check_xml_btrace_version, NULL },
	508	{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
	509	};
	510
	511	#endif /* defined (HAVE_LIBEXPAT) */
	512
	513	/* See btrace.h. */
	514
515	VEC (btrace_block_s) *
516	parse_xml_btrace (const char *buffer)
517	{
518	VEC (btrace_block_s) *btrace = NULL;
519	struct cleanup *cleanup;
520	int errcode;
521
522	#if defined (HAVE_LIBEXPAT)
523
524	cleanup = make_cleanup (VEC_cleanup (btrace_block_s), &btrace);
525	errcode = gdb_xml_parse_quick (_("btrace"), "btrace.dtd", btrace_elements,
526	buffer, &btrace);
527	if (errcode != 0)
528	{
529	do_cleanups (cleanup);
530	return NULL;
531	}
532
533	/* Keep parse results. */
534	discard_cleanups (cleanup);
535
536	#else /* !defined (HAVE_LIBEXPAT) */
537
538	error (_("Cannot process branch trace. XML parsing is not supported."));
539
540	#endif /* !defined (HAVE_LIBEXPAT) */
541
542	return btrace;
543	}