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1 | /* Branch trace support for GDB, the GNU debugger. |
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 | #ifndef BTRACE_H | |
23 | #define BTRACE_H | |
24 | ||
25 | /* Branch tracing (btrace) is a per-thread control-flow execution trace of the | |
26 | inferior. For presentation purposes, the branch trace is represented as a | |
27 | list of sequential control-flow blocks, one such list per thread. */ | |
28 | ||
29 | #include "btrace-common.h" | |
30 | ||
31 | struct thread_info; | |
23a7fe75 | 32 | struct btrace_function; |
02d27625 MM |
33 | |
34 | /* A branch trace instruction. | |
35 | ||
36 | This represents a single instruction in a branch trace. */ | |
23a7fe75 | 37 | struct btrace_insn |
02d27625 MM |
38 | { |
39 | /* The address of this instruction. */ | |
40 | CORE_ADDR pc; | |
41 | }; | |
42 | ||
23a7fe75 MM |
43 | /* A vector of branch trace instructions. */ |
44 | typedef struct btrace_insn btrace_insn_s; | |
45 | DEF_VEC_O (btrace_insn_s); | |
46 | ||
47 | /* A doubly-linked list of branch trace function segments. */ | |
48 | struct btrace_func_link | |
49 | { | |
50 | struct btrace_function *prev; | |
51 | struct btrace_function *next; | |
52 | }; | |
53 | ||
54 | /* Flags for btrace function segments. */ | |
55 | enum btrace_function_flag | |
56 | { | |
57 | /* The 'up' link interpretation. | |
58 | If set, it points to the function segment we returned to. | |
59 | If clear, it points to the function segment we called from. */ | |
60 | BFUN_UP_LINKS_TO_RET = (1 << 0), | |
61 | ||
62 | /* The 'up' link points to a tail call. This obviously only makes sense | |
63 | if bfun_up_links_to_ret is clear. */ | |
64 | BFUN_UP_LINKS_TO_TAILCALL = (1 << 1) | |
65 | }; | |
66 | ||
67 | /* A branch trace function segment. | |
02d27625 MM |
68 | |
69 | This represents a function segment in a branch trace, i.e. a consecutive | |
23a7fe75 MM |
70 | number of instructions belonging to the same function. |
71 | ||
72 | We do not allow function segments without any instructions. */ | |
73 | struct btrace_function | |
02d27625 | 74 | { |
23a7fe75 | 75 | /* The full and minimal symbol for the function. Both may be NULL. */ |
02d27625 MM |
76 | struct minimal_symbol *msym; |
77 | struct symbol *sym; | |
78 | ||
23a7fe75 MM |
79 | /* The previous and next segment belonging to the same function. |
80 | If a function calls another function, the former will have at least | |
81 | two segments: one before the call and another after the return. */ | |
82 | struct btrace_func_link segment; | |
83 | ||
84 | /* The previous and next function in control flow order. */ | |
85 | struct btrace_func_link flow; | |
86 | ||
87 | /* The directly preceding function segment in a (fake) call stack. */ | |
88 | struct btrace_function *up; | |
89 | ||
90 | /* The instructions in this function segment. | |
91 | The instruction vector will never be empty. */ | |
92 | VEC (btrace_insn_s) *insn; | |
93 | ||
94 | /* The instruction number offset for the first instruction in this | |
95 | function segment. */ | |
96 | unsigned int insn_offset; | |
97 | ||
98 | /* The function number in control-flow order. */ | |
99 | unsigned int number; | |
100 | ||
101 | /* The function level in a back trace across the entire branch trace. | |
102 | A caller's level is one lower than the level of its callee. | |
103 | ||
104 | Levels can be negative if we see returns for which we have not seen | |
105 | the corresponding calls. The branch trace thread information provides | |
106 | a fixup to normalize function levels so the smallest level is zero. */ | |
107 | int level; | |
108 | ||
02d27625 MM |
109 | /* The source line range of this function segment (both inclusive). */ |
110 | int lbegin, lend; | |
111 | ||
23a7fe75 MM |
112 | /* A bit-vector of btrace_function_flag. */ |
113 | enum btrace_function_flag flags; | |
02d27625 MM |
114 | }; |
115 | ||
23a7fe75 MM |
116 | /* A branch trace instruction iterator. */ |
117 | struct btrace_insn_iterator | |
118 | { | |
119 | /* The branch trace function segment containing the instruction. | |
120 | Will never be NULL. */ | |
121 | const struct btrace_function *function; | |
02d27625 | 122 | |
23a7fe75 MM |
123 | /* The index into the function segment's instruction vector. */ |
124 | unsigned int index; | |
125 | }; | |
02d27625 | 126 | |
23a7fe75 MM |
127 | /* A branch trace function call iterator. */ |
128 | struct btrace_call_iterator | |
129 | { | |
130 | /* The branch trace information for this thread. Will never be NULL. */ | |
131 | const struct btrace_thread_info *btinfo; | |
132 | ||
133 | /* The branch trace function segment. | |
134 | This will be NULL for the iterator pointing to the end of the trace. */ | |
135 | const struct btrace_function *function; | |
136 | }; | |
02d27625 MM |
137 | |
138 | /* Branch trace iteration state for "record instruction-history". */ | |
23a7fe75 | 139 | struct btrace_insn_history |
02d27625 | 140 | { |
23a7fe75 MM |
141 | /* The branch trace instruction range from BEGIN (inclusive) to |
142 | END (exclusive) that has been covered last time. */ | |
143 | struct btrace_insn_iterator begin; | |
144 | struct btrace_insn_iterator end; | |
02d27625 MM |
145 | }; |
146 | ||
147 | /* Branch trace iteration state for "record function-call-history". */ | |
23a7fe75 | 148 | struct btrace_call_history |
02d27625 | 149 | { |
23a7fe75 MM |
150 | /* The branch trace function range from BEGIN (inclusive) to END (exclusive) |
151 | that has been covered last time. */ | |
152 | struct btrace_call_iterator begin; | |
153 | struct btrace_call_iterator end; | |
02d27625 MM |
154 | }; |
155 | ||
156 | /* Branch trace information per thread. | |
157 | ||
158 | This represents the branch trace configuration as well as the entry point | |
159 | into the branch trace data. For the latter, it also contains the index into | |
160 | an array of branch trace blocks used for iterating though the branch trace | |
161 | blocks of a thread. */ | |
162 | struct btrace_thread_info | |
163 | { | |
164 | /* The target branch trace information for this thread. | |
165 | ||
166 | This contains the branch trace configuration as well as any | |
167 | target-specific information necessary for implementing branch tracing on | |
168 | the underlying architecture. */ | |
169 | struct btrace_target_info *target; | |
170 | ||
23a7fe75 MM |
171 | /* The current branch trace for this thread (both inclusive). |
172 | ||
173 | The last instruction of END is the current instruction, which is not | |
174 | part of the execution history. | |
175 | Both will be NULL if there is no branch trace available. If there is | |
176 | branch trace available, both will be non-NULL. */ | |
177 | struct btrace_function *begin; | |
178 | struct btrace_function *end; | |
179 | ||
180 | /* The function level offset. When added to each function's LEVEL, | |
181 | this normalizes the function levels such that the smallest level | |
182 | becomes zero. */ | |
183 | int level; | |
02d27625 MM |
184 | |
185 | /* The instruction history iterator. */ | |
23a7fe75 | 186 | struct btrace_insn_history *insn_history; |
02d27625 MM |
187 | |
188 | /* The function call history iterator. */ | |
23a7fe75 | 189 | struct btrace_call_history *call_history; |
07bbe694 MM |
190 | |
191 | /* The current replay position. NULL if not replaying. */ | |
192 | struct btrace_insn_iterator *replay; | |
02d27625 MM |
193 | }; |
194 | ||
195 | /* Enable branch tracing for a thread. */ | |
196 | extern void btrace_enable (struct thread_info *tp); | |
197 | ||
198 | /* Disable branch tracing for a thread. | |
199 | This will also delete the current branch trace data. */ | |
200 | extern void btrace_disable (struct thread_info *); | |
201 | ||
202 | /* Disable branch tracing for a thread during teardown. | |
203 | This is similar to btrace_disable, except that it will use | |
204 | target_teardown_btrace instead of target_disable_btrace. */ | |
205 | extern void btrace_teardown (struct thread_info *); | |
206 | ||
207 | /* Fetch the branch trace for a single thread. */ | |
208 | extern void btrace_fetch (struct thread_info *); | |
209 | ||
210 | /* Clear the branch trace for a single thread. */ | |
211 | extern void btrace_clear (struct thread_info *); | |
212 | ||
213 | /* Clear the branch trace for all threads when an object file goes away. */ | |
214 | extern void btrace_free_objfile (struct objfile *); | |
215 | ||
c12a2917 MM |
216 | /* Parse a branch trace xml document into a block vector. */ |
217 | extern VEC (btrace_block_s) *parse_xml_btrace (const char*); | |
218 | ||
23a7fe75 MM |
219 | /* Dereference a branch trace instruction iterator. Return a pointer to the |
220 | instruction the iterator points to. */ | |
221 | extern const struct btrace_insn * | |
222 | btrace_insn_get (const struct btrace_insn_iterator *); | |
223 | ||
224 | /* Return the instruction number for a branch trace iterator. | |
225 | Returns one past the maximum instruction number for the end iterator. | |
226 | Returns zero if the iterator does not point to a valid instruction. */ | |
227 | extern unsigned int btrace_insn_number (const struct btrace_insn_iterator *); | |
228 | ||
229 | /* Initialize a branch trace instruction iterator to point to the begin/end of | |
230 | the branch trace. Throws an error if there is no branch trace. */ | |
231 | extern void btrace_insn_begin (struct btrace_insn_iterator *, | |
232 | const struct btrace_thread_info *); | |
233 | extern void btrace_insn_end (struct btrace_insn_iterator *, | |
234 | const struct btrace_thread_info *); | |
235 | ||
236 | /* Increment/decrement a branch trace instruction iterator by at most STRIDE | |
237 | instructions. Return the number of instructions by which the instruction | |
238 | iterator has been advanced. | |
239 | Returns zero, if the operation failed or STRIDE had been zero. */ | |
240 | extern unsigned int btrace_insn_next (struct btrace_insn_iterator *, | |
241 | unsigned int stride); | |
242 | extern unsigned int btrace_insn_prev (struct btrace_insn_iterator *, | |
243 | unsigned int stride); | |
244 | ||
245 | /* Compare two branch trace instruction iterators. | |
246 | Return a negative number if LHS < RHS. | |
247 | Return zero if LHS == RHS. | |
248 | Return a positive number if LHS > RHS. */ | |
249 | extern int btrace_insn_cmp (const struct btrace_insn_iterator *lhs, | |
250 | const struct btrace_insn_iterator *rhs); | |
251 | ||
252 | /* Find an instruction in the function branch trace by its number. | |
253 | If the instruction is found, initialize the branch trace instruction | |
254 | iterator to point to this instruction and return non-zero. | |
255 | Return zero otherwise. */ | |
256 | extern int btrace_find_insn_by_number (struct btrace_insn_iterator *, | |
257 | const struct btrace_thread_info *, | |
258 | unsigned int number); | |
259 | ||
260 | /* Dereference a branch trace call iterator. Return a pointer to the | |
261 | function the iterator points to or NULL if the interator points past | |
262 | the end of the branch trace. */ | |
263 | extern const struct btrace_function * | |
264 | btrace_call_get (const struct btrace_call_iterator *); | |
265 | ||
266 | /* Return the function number for a branch trace call iterator. | |
267 | Returns one past the maximum function number for the end iterator. | |
268 | Returns zero if the iterator does not point to a valid function. */ | |
269 | extern unsigned int btrace_call_number (const struct btrace_call_iterator *); | |
270 | ||
271 | /* Initialize a branch trace call iterator to point to the begin/end of | |
272 | the branch trace. Throws an error if there is no branch trace. */ | |
273 | extern void btrace_call_begin (struct btrace_call_iterator *, | |
274 | const struct btrace_thread_info *); | |
275 | extern void btrace_call_end (struct btrace_call_iterator *, | |
276 | const struct btrace_thread_info *); | |
277 | ||
278 | /* Increment/decrement a branch trace call iterator by at most STRIDE function | |
279 | segments. Return the number of function segments by which the call | |
280 | iterator has been advanced. | |
281 | Returns zero, if the operation failed or STRIDE had been zero. */ | |
282 | extern unsigned int btrace_call_next (struct btrace_call_iterator *, | |
283 | unsigned int stride); | |
284 | extern unsigned int btrace_call_prev (struct btrace_call_iterator *, | |
285 | unsigned int stride); | |
286 | ||
287 | /* Compare two branch trace call iterators. | |
288 | Return a negative number if LHS < RHS. | |
289 | Return zero if LHS == RHS. | |
290 | Return a positive number if LHS > RHS. */ | |
291 | extern int btrace_call_cmp (const struct btrace_call_iterator *lhs, | |
292 | const struct btrace_call_iterator *rhs); | |
293 | ||
294 | /* Find a function in the function branch trace by its NUMBER. | |
295 | If the function is found, initialize the branch trace call | |
296 | iterator to point to this function and return non-zero. | |
297 | Return zero otherwise. */ | |
298 | extern int btrace_find_call_by_number (struct btrace_call_iterator *, | |
299 | const struct btrace_thread_info *, | |
300 | unsigned int number); | |
301 | ||
302 | /* Set the branch trace instruction history from BEGIN (inclusive) to | |
303 | END (exclusive). */ | |
304 | extern void btrace_set_insn_history (struct btrace_thread_info *, | |
305 | const struct btrace_insn_iterator *begin, | |
306 | const struct btrace_insn_iterator *end); | |
307 | ||
308 | /* Set the branch trace function call history from BEGIN (inclusive) to | |
309 | END (exclusive). */ | |
310 | extern void btrace_set_call_history (struct btrace_thread_info *, | |
311 | const struct btrace_call_iterator *begin, | |
312 | const struct btrace_call_iterator *end); | |
313 | ||
07bbe694 MM |
314 | /* Determine if branch tracing is currently replaying TP. */ |
315 | extern int btrace_is_replaying (struct thread_info *tp); | |
316 | ||
6e07b1d2 MM |
317 | /* Return non-zero if the branch trace for TP is empty; zero otherwise. */ |
318 | extern int btrace_is_empty (struct thread_info *tp); | |
319 | ||
320 | ||
02d27625 | 321 | #endif /* BTRACE_H */ |