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ager@chromium.org9258b6b2008-09-11 09:11:10 +00001// Copyright 2006-2008 the V8 project authors. All rights reserved.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6// * Redistributions of source code must retain the above copyright
7// notice, this list of conditions and the following disclaimer.
8// * Redistributions in binary form must reproduce the above
9// copyright notice, this list of conditions and the following
10// disclaimer in the documentation and/or other materials provided
11// with the distribution.
12// * Neither the name of Google Inc. nor the names of its
13// contributors may be used to endorse or promote products derived
14// from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#include "v8.h"
29
30#include "api.h"
31#include "arguments.h"
32#include "bootstrapper.h"
33#include "code-stubs.h"
ager@chromium.org5c838252010-02-19 08:53:10 +000034#include "codegen.h"
kasperl@chromium.org71affb52009-05-26 05:44:31 +000035#include "compilation-cache.h"
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000036#include "compiler.h"
37#include "debug.h"
38#include "execution.h"
39#include "global-handles.h"
ager@chromium.org65dad4b2009-04-23 08:48:43 +000040#include "ic.h"
41#include "ic-inl.h"
ager@chromium.orgce5e87b2010-03-10 10:24:18 +000042#include "messages.h"
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000043#include "natives.h"
44#include "stub-cache.h"
kasper.lund7276f142008-07-30 08:49:36 +000045#include "log.h"
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000046
ager@chromium.org5ec48922009-05-05 07:25:34 +000047#include "../include/v8-debug.h"
48
kasperl@chromium.org71affb52009-05-26 05:44:31 +000049namespace v8 {
50namespace internal {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000051
ager@chromium.org65dad4b2009-04-23 08:48:43 +000052#ifdef ENABLE_DEBUGGER_SUPPORT
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000053static void PrintLn(v8::Local<v8::Value> value) {
54 v8::Local<v8::String> s = value->ToString();
sgjesse@chromium.org720dc0b2010-05-10 09:25:39 +000055 ScopedVector<char> data(s->Length() + 1);
56 if (data.start() == NULL) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000057 V8::FatalProcessOutOfMemory("PrintLn");
58 return;
59 }
sgjesse@chromium.org720dc0b2010-05-10 09:25:39 +000060 s->WriteAscii(data.start());
61 PrintF("%s\n", data.start());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000062}
63
64
lrn@chromium.org1af7e1b2010-06-07 11:12:01 +000065static Handle<Code> ComputeCallDebugBreak(int argc, Code::Kind kind) {
66 CALL_HEAP_FUNCTION(StubCache::ComputeCallDebugBreak(argc, kind), Code);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000067}
68
69
lrn@chromium.org1af7e1b2010-06-07 11:12:01 +000070static Handle<Code> ComputeCallDebugPrepareStepIn(int argc, Code::Kind kind) {
71 CALL_HEAP_FUNCTION(
72 StubCache::ComputeCallDebugPrepareStepIn(argc, kind), Code);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000073}
74
75
erik.corry@gmail.com9dfbea42010-05-21 12:58:28 +000076static v8::Handle<v8::Context> GetDebugEventContext() {
77 Handle<Context> context = Debug::debugger_entry()->GetContext();
78 // Top::context() may have been NULL when "script collected" event occured.
79 if (*context == NULL) {
80 return v8::Local<v8::Context>();
81 }
82 Handle<Context> global_context(context->global_context());
83 return v8::Utils::ToLocal(global_context);
84}
85
86
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +000087BreakLocationIterator::BreakLocationIterator(Handle<DebugInfo> debug_info,
88 BreakLocatorType type) {
89 debug_info_ = debug_info;
90 type_ = type;
91 reloc_iterator_ = NULL;
92 reloc_iterator_original_ = NULL;
93 Reset(); // Initialize the rest of the member variables.
94}
95
96
97BreakLocationIterator::~BreakLocationIterator() {
98 ASSERT(reloc_iterator_ != NULL);
99 ASSERT(reloc_iterator_original_ != NULL);
100 delete reloc_iterator_;
101 delete reloc_iterator_original_;
102}
103
104
105void BreakLocationIterator::Next() {
106 AssertNoAllocation nogc;
107 ASSERT(!RinfoDone());
108
109 // Iterate through reloc info for code and original code stopping at each
110 // breakable code target.
111 bool first = break_point_ == -1;
112 while (!RinfoDone()) {
113 if (!first) RinfoNext();
114 first = false;
115 if (RinfoDone()) return;
116
ager@chromium.org236ad962008-09-25 09:45:57 +0000117 // Whenever a statement position or (plain) position is passed update the
118 // current value of these.
119 if (RelocInfo::IsPosition(rmode())) {
120 if (RelocInfo::IsStatementPosition(rmode())) {
ager@chromium.orgc4c92722009-11-18 14:12:51 +0000121 statement_position_ = static_cast<int>(
122 rinfo()->data() - debug_info_->shared()->start_position());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000123 }
ager@chromium.org236ad962008-09-25 09:45:57 +0000124 // Always update the position as we don't want that to be before the
125 // statement position.
ager@chromium.orgc4c92722009-11-18 14:12:51 +0000126 position_ = static_cast<int>(
127 rinfo()->data() - debug_info_->shared()->start_position());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000128 ASSERT(position_ >= 0);
129 ASSERT(statement_position_ >= 0);
130 }
131
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +0000132 if (IsDebugBreakSlot()) {
133 // There is always a possible break point at a debug break slot.
134 break_point_++;
135 return;
136 } else if (RelocInfo::IsCodeTarget(rmode())) {
137 // Check for breakable code target. Look in the original code as setting
138 // break points can cause the code targets in the running (debugged) code
139 // to be of a different kind than in the original code.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000140 Address target = original_rinfo()->target_address();
ager@chromium.org8bb60582008-12-11 12:02:20 +0000141 Code* code = Code::GetCodeFromTargetAddress(target);
ager@chromium.orgce5e87b2010-03-10 10:24:18 +0000142 if ((code->is_inline_cache_stub() &&
143 code->kind() != Code::BINARY_OP_IC) ||
144 RelocInfo::IsConstructCall(rmode())) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000145 break_point_++;
146 return;
147 }
148 if (code->kind() == Code::STUB) {
ager@chromium.orga1645e22009-09-09 19:27:10 +0000149 if (IsDebuggerStatement()) {
150 break_point_++;
151 return;
152 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000153 if (type_ == ALL_BREAK_LOCATIONS) {
154 if (Debug::IsBreakStub(code)) {
155 break_point_++;
156 return;
157 }
158 } else {
159 ASSERT(type_ == SOURCE_BREAK_LOCATIONS);
160 if (Debug::IsSourceBreakStub(code)) {
161 break_point_++;
162 return;
163 }
164 }
165 }
166 }
167
168 // Check for break at return.
ager@chromium.org236ad962008-09-25 09:45:57 +0000169 if (RelocInfo::IsJSReturn(rmode())) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000170 // Set the positions to the end of the function.
171 if (debug_info_->shared()->HasSourceCode()) {
172 position_ = debug_info_->shared()->end_position() -
whesse@chromium.orge90029b2010-08-02 11:52:17 +0000173 debug_info_->shared()->start_position() - 1;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000174 } else {
175 position_ = 0;
176 }
177 statement_position_ = position_;
178 break_point_++;
179 return;
180 }
181 }
182}
183
184
185void BreakLocationIterator::Next(int count) {
186 while (count > 0) {
187 Next();
188 count--;
189 }
190}
191
192
193// Find the break point closest to the supplied address.
194void BreakLocationIterator::FindBreakLocationFromAddress(Address pc) {
195 // Run through all break points to locate the one closest to the address.
196 int closest_break_point = 0;
197 int distance = kMaxInt;
198 while (!Done()) {
199 // Check if this break point is closer that what was previously found.
200 if (this->pc() < pc && pc - this->pc() < distance) {
201 closest_break_point = break_point();
ager@chromium.orgc4c92722009-11-18 14:12:51 +0000202 distance = static_cast<int>(pc - this->pc());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000203 // Check whether we can't get any closer.
204 if (distance == 0) break;
205 }
206 Next();
207 }
208
209 // Move to the break point found.
210 Reset();
211 Next(closest_break_point);
212}
213
214
215// Find the break point closest to the supplied source position.
216void BreakLocationIterator::FindBreakLocationFromPosition(int position) {
217 // Run through all break points to locate the one closest to the source
218 // position.
219 int closest_break_point = 0;
220 int distance = kMaxInt;
221 while (!Done()) {
222 // Check if this break point is closer that what was previously found.
223 if (position <= statement_position() &&
224 statement_position() - position < distance) {
225 closest_break_point = break_point();
226 distance = statement_position() - position;
227 // Check whether we can't get any closer.
228 if (distance == 0) break;
229 }
230 Next();
231 }
232
233 // Move to the break point found.
234 Reset();
235 Next(closest_break_point);
236}
237
238
239void BreakLocationIterator::Reset() {
240 // Create relocation iterators for the two code objects.
241 if (reloc_iterator_ != NULL) delete reloc_iterator_;
242 if (reloc_iterator_original_ != NULL) delete reloc_iterator_original_;
243 reloc_iterator_ = new RelocIterator(debug_info_->code());
244 reloc_iterator_original_ = new RelocIterator(debug_info_->original_code());
245
246 // Position at the first break point.
247 break_point_ = -1;
248 position_ = 1;
249 statement_position_ = 1;
250 Next();
251}
252
253
254bool BreakLocationIterator::Done() const {
255 return RinfoDone();
256}
257
258
259void BreakLocationIterator::SetBreakPoint(Handle<Object> break_point_object) {
260 // If there is not already a real break point here patch code with debug
261 // break.
262 if (!HasBreakPoint()) {
263 SetDebugBreak();
264 }
ager@chromium.orga1645e22009-09-09 19:27:10 +0000265 ASSERT(IsDebugBreak() || IsDebuggerStatement());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000266 // Set the break point information.
267 DebugInfo::SetBreakPoint(debug_info_, code_position(),
268 position(), statement_position(),
269 break_point_object);
270}
271
272
273void BreakLocationIterator::ClearBreakPoint(Handle<Object> break_point_object) {
274 // Clear the break point information.
275 DebugInfo::ClearBreakPoint(debug_info_, code_position(), break_point_object);
276 // If there are no more break points here remove the debug break.
277 if (!HasBreakPoint()) {
278 ClearDebugBreak();
279 ASSERT(!IsDebugBreak());
280 }
281}
282
283
284void BreakLocationIterator::SetOneShot() {
ager@chromium.orga1645e22009-09-09 19:27:10 +0000285 // Debugger statement always calls debugger. No need to modify it.
286 if (IsDebuggerStatement()) {
287 return;
288 }
289
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000290 // If there is a real break point here no more to do.
291 if (HasBreakPoint()) {
292 ASSERT(IsDebugBreak());
293 return;
294 }
295
296 // Patch code with debug break.
297 SetDebugBreak();
298}
299
300
301void BreakLocationIterator::ClearOneShot() {
ager@chromium.orga1645e22009-09-09 19:27:10 +0000302 // Debugger statement always calls debugger. No need to modify it.
303 if (IsDebuggerStatement()) {
304 return;
305 }
306
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000307 // If there is a real break point here no more to do.
308 if (HasBreakPoint()) {
309 ASSERT(IsDebugBreak());
310 return;
311 }
312
313 // Patch code removing debug break.
314 ClearDebugBreak();
315 ASSERT(!IsDebugBreak());
316}
317
318
319void BreakLocationIterator::SetDebugBreak() {
ager@chromium.orga1645e22009-09-09 19:27:10 +0000320 // Debugger statement always calls debugger. No need to modify it.
321 if (IsDebuggerStatement()) {
322 return;
323 }
324
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000325 // If there is already a break point here just return. This might happen if
v8.team.kasperl727e9952008-09-02 14:56:44 +0000326 // the same code is flooded with break points twice. Flooding the same
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000327 // function twice might happen when stepping in a function with an exception
328 // handler as the handler and the function is the same.
329 if (IsDebugBreak()) {
330 return;
331 }
332
ager@chromium.org236ad962008-09-25 09:45:57 +0000333 if (RelocInfo::IsJSReturn(rmode())) {
iposva@chromium.org245aa852009-02-10 00:49:54 +0000334 // Patch the frame exit code with a break point.
335 SetDebugBreakAtReturn();
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +0000336 } else if (IsDebugBreakSlot()) {
337 // Patch the code in the break slot.
338 SetDebugBreakAtSlot();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000339 } else {
ager@chromium.org65dad4b2009-04-23 08:48:43 +0000340 // Patch the IC call.
341 SetDebugBreakAtIC();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000342 }
343 ASSERT(IsDebugBreak());
344}
345
346
347void BreakLocationIterator::ClearDebugBreak() {
ager@chromium.orga1645e22009-09-09 19:27:10 +0000348 // Debugger statement always calls debugger. No need to modify it.
349 if (IsDebuggerStatement()) {
350 return;
351 }
352
ager@chromium.org236ad962008-09-25 09:45:57 +0000353 if (RelocInfo::IsJSReturn(rmode())) {
iposva@chromium.org245aa852009-02-10 00:49:54 +0000354 // Restore the frame exit code.
355 ClearDebugBreakAtReturn();
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +0000356 } else if (IsDebugBreakSlot()) {
357 // Restore the code in the break slot.
358 ClearDebugBreakAtSlot();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000359 } else {
ager@chromium.org65dad4b2009-04-23 08:48:43 +0000360 // Patch the IC call.
361 ClearDebugBreakAtIC();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000362 }
363 ASSERT(!IsDebugBreak());
364}
365
366
367void BreakLocationIterator::PrepareStepIn() {
ager@chromium.org381abbb2009-02-25 13:23:22 +0000368 HandleScope scope;
369
ager@chromium.orga1645e22009-09-09 19:27:10 +0000370 // Step in can only be prepared if currently positioned on an IC call,
371 // construct call or CallFunction stub call.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000372 Address target = rinfo()->target_address();
ager@chromium.orga1645e22009-09-09 19:27:10 +0000373 Handle<Code> code(Code::GetCodeFromTargetAddress(target));
lrn@chromium.org1af7e1b2010-06-07 11:12:01 +0000374 if (code->is_call_stub() || code->is_keyed_call_stub()) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000375 // Step in through IC call is handled by the runtime system. Therefore make
376 // sure that the any current IC is cleared and the runtime system is
377 // called. If the executing code has a debug break at the location change
378 // the call in the original code as it is the code there that will be
379 // executed in place of the debug break call.
lrn@chromium.org1af7e1b2010-06-07 11:12:01 +0000380 Handle<Code> stub = ComputeCallDebugPrepareStepIn(code->arguments_count(),
381 code->kind());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000382 if (IsDebugBreak()) {
383 original_rinfo()->set_target_address(stub->entry());
384 } else {
385 rinfo()->set_target_address(stub->entry());
386 }
387 } else {
ager@chromium.orga1645e22009-09-09 19:27:10 +0000388#ifdef DEBUG
389 // All the following stuff is needed only for assertion checks so the code
390 // is wrapped in ifdef.
391 Handle<Code> maybe_call_function_stub = code;
392 if (IsDebugBreak()) {
393 Address original_target = original_rinfo()->target_address();
394 maybe_call_function_stub =
395 Handle<Code>(Code::GetCodeFromTargetAddress(original_target));
396 }
397 bool is_call_function_stub =
398 (maybe_call_function_stub->kind() == Code::STUB &&
399 maybe_call_function_stub->major_key() == CodeStub::CallFunction);
400
kasperl@chromium.orge959c182009-07-27 08:59:04 +0000401 // Step in through construct call requires no changes to the running code.
402 // Step in through getters/setters should already be prepared as well
403 // because caller of this function (Debug::PrepareStep) is expected to
404 // flood the top frame's function with one shot breakpoints.
ager@chromium.orga1645e22009-09-09 19:27:10 +0000405 // Step in through CallFunction stub should also be prepared by caller of
406 // this function (Debug::PrepareStep) which should flood target function
407 // with breakpoints.
408 ASSERT(RelocInfo::IsConstructCall(rmode()) || code->is_inline_cache_stub()
409 || is_call_function_stub);
410#endif
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000411 }
412}
413
414
415// Check whether the break point is at a position which will exit the function.
416bool BreakLocationIterator::IsExit() const {
ager@chromium.org236ad962008-09-25 09:45:57 +0000417 return (RelocInfo::IsJSReturn(rmode()));
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000418}
419
420
421bool BreakLocationIterator::HasBreakPoint() {
422 return debug_info_->HasBreakPoint(code_position());
423}
424
425
426// Check whether there is a debug break at the current position.
427bool BreakLocationIterator::IsDebugBreak() {
ager@chromium.org236ad962008-09-25 09:45:57 +0000428 if (RelocInfo::IsJSReturn(rmode())) {
iposva@chromium.org245aa852009-02-10 00:49:54 +0000429 return IsDebugBreakAtReturn();
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +0000430 } else if (IsDebugBreakSlot()) {
431 return IsDebugBreakAtSlot();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000432 } else {
433 return Debug::IsDebugBreak(rinfo()->target_address());
434 }
435}
436
437
ager@chromium.org65dad4b2009-04-23 08:48:43 +0000438void BreakLocationIterator::SetDebugBreakAtIC() {
439 // Patch the original code with the current address as the current address
440 // might have changed by the inline caching since the code was copied.
441 original_rinfo()->set_target_address(rinfo()->target_address());
442
443 RelocInfo::Mode mode = rmode();
444 if (RelocInfo::IsCodeTarget(mode)) {
445 Address target = rinfo()->target_address();
446 Handle<Code> code(Code::GetCodeFromTargetAddress(target));
447
448 // Patch the code to invoke the builtin debug break function matching the
449 // calling convention used by the call site.
450 Handle<Code> dbgbrk_code(Debug::FindDebugBreak(code, mode));
451 rinfo()->set_target_address(dbgbrk_code->entry());
452
453 // For stubs that refer back to an inlined version clear the cached map for
454 // the inlined case to always go through the IC. As long as the break point
455 // is set the patching performed by the runtime system will take place in
456 // the code copy and will therefore have no effect on the running code
457 // keeping it from using the inlined code.
sgjesse@chromium.org720dc0b2010-05-10 09:25:39 +0000458 if (code->is_keyed_load_stub()) {
459 KeyedLoadIC::ClearInlinedVersion(pc());
460 } else if (code->is_keyed_store_stub()) {
461 KeyedStoreIC::ClearInlinedVersion(pc());
462 } else if (code->is_load_stub()) {
463 LoadIC::ClearInlinedVersion(pc());
ricow@chromium.org0b9f8502010-08-18 07:45:01 +0000464 } else if (code->is_store_stub()) {
465 StoreIC::ClearInlinedVersion(pc());
sgjesse@chromium.org720dc0b2010-05-10 09:25:39 +0000466 }
ager@chromium.org65dad4b2009-04-23 08:48:43 +0000467 }
468}
469
470
471void BreakLocationIterator::ClearDebugBreakAtIC() {
472 // Patch the code to the original invoke.
473 rinfo()->set_target_address(original_rinfo()->target_address());
ager@chromium.orgeadaf222009-06-16 09:43:10 +0000474
475 RelocInfo::Mode mode = rmode();
476 if (RelocInfo::IsCodeTarget(mode)) {
erik.corry@gmail.com4a2e25e2010-07-07 12:22:46 +0000477 AssertNoAllocation nogc;
ager@chromium.orgeadaf222009-06-16 09:43:10 +0000478 Address target = original_rinfo()->target_address();
erik.corry@gmail.com4a2e25e2010-07-07 12:22:46 +0000479 Code* code = Code::GetCodeFromTargetAddress(target);
ager@chromium.orgeadaf222009-06-16 09:43:10 +0000480
481 // Restore the inlined version of keyed stores to get back to the
482 // fast case. We need to patch back the keyed store because no
483 // patching happens when running normally. For keyed loads, the
484 // map check will get patched back when running normally after ICs
485 // have been cleared at GC.
486 if (code->is_keyed_store_stub()) KeyedStoreIC::RestoreInlinedVersion(pc());
487 }
ager@chromium.org65dad4b2009-04-23 08:48:43 +0000488}
489
490
ager@chromium.orga1645e22009-09-09 19:27:10 +0000491bool BreakLocationIterator::IsDebuggerStatement() {
ager@chromium.org5c838252010-02-19 08:53:10 +0000492 return RelocInfo::DEBUG_BREAK == rmode();
ager@chromium.orga1645e22009-09-09 19:27:10 +0000493}
494
495
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +0000496bool BreakLocationIterator::IsDebugBreakSlot() {
497 return RelocInfo::DEBUG_BREAK_SLOT == rmode();
498}
499
500
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000501Object* BreakLocationIterator::BreakPointObjects() {
502 return debug_info_->GetBreakPointObjects(code_position());
503}
504
505
ager@chromium.org381abbb2009-02-25 13:23:22 +0000506// Clear out all the debug break code. This is ONLY supposed to be used when
507// shutting down the debugger as it will leave the break point information in
508// DebugInfo even though the code is patched back to the non break point state.
509void BreakLocationIterator::ClearAllDebugBreak() {
510 while (!Done()) {
511 ClearDebugBreak();
512 Next();
513 }
514}
515
516
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000517bool BreakLocationIterator::RinfoDone() const {
518 ASSERT(reloc_iterator_->done() == reloc_iterator_original_->done());
519 return reloc_iterator_->done();
520}
521
522
523void BreakLocationIterator::RinfoNext() {
524 reloc_iterator_->next();
525 reloc_iterator_original_->next();
526#ifdef DEBUG
527 ASSERT(reloc_iterator_->done() == reloc_iterator_original_->done());
528 if (!reloc_iterator_->done()) {
529 ASSERT(rmode() == original_rmode());
530 }
531#endif
532}
533
534
535bool Debug::has_break_points_ = false;
kasperl@chromium.org71affb52009-05-26 05:44:31 +0000536ScriptCache* Debug::script_cache_ = NULL;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000537DebugInfoListNode* Debug::debug_info_list_ = NULL;
538
539
540// Threading support.
541void Debug::ThreadInit() {
kasperl@chromium.org7be3c992009-03-12 07:19:55 +0000542 thread_local_.break_count_ = 0;
543 thread_local_.break_id_ = 0;
544 thread_local_.break_frame_id_ = StackFrame::NO_ID;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000545 thread_local_.last_step_action_ = StepNone;
ager@chromium.org236ad962008-09-25 09:45:57 +0000546 thread_local_.last_statement_position_ = RelocInfo::kNoPosition;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000547 thread_local_.step_count_ = 0;
548 thread_local_.last_fp_ = 0;
549 thread_local_.step_into_fp_ = 0;
ager@chromium.orga1645e22009-09-09 19:27:10 +0000550 thread_local_.step_out_fp_ = 0;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000551 thread_local_.after_break_target_ = 0;
kasperl@chromium.org7be3c992009-03-12 07:19:55 +0000552 thread_local_.debugger_entry_ = NULL;
sgjesse@chromium.org755c5b12009-05-29 11:04:38 +0000553 thread_local_.pending_interrupts_ = 0;
ricow@chromium.org0b9f8502010-08-18 07:45:01 +0000554 thread_local_.restarter_frame_function_pointer_ = NULL;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000555}
556
557
558JSCallerSavedBuffer Debug::registers_;
559Debug::ThreadLocal Debug::thread_local_;
560
561
562char* Debug::ArchiveDebug(char* storage) {
563 char* to = storage;
564 memcpy(to, reinterpret_cast<char*>(&thread_local_), sizeof(ThreadLocal));
565 to += sizeof(ThreadLocal);
566 memcpy(to, reinterpret_cast<char*>(&registers_), sizeof(registers_));
567 ThreadInit();
568 ASSERT(to <= storage + ArchiveSpacePerThread());
569 return storage + ArchiveSpacePerThread();
570}
571
572
573char* Debug::RestoreDebug(char* storage) {
574 char* from = storage;
575 memcpy(reinterpret_cast<char*>(&thread_local_), from, sizeof(ThreadLocal));
576 from += sizeof(ThreadLocal);
577 memcpy(reinterpret_cast<char*>(&registers_), from, sizeof(registers_));
578 ASSERT(from <= storage + ArchiveSpacePerThread());
579 return storage + ArchiveSpacePerThread();
580}
581
582
583int Debug::ArchiveSpacePerThread() {
584 return sizeof(ThreadLocal) + sizeof(registers_);
585}
586
587
ager@chromium.orgea4f62e2010-08-16 16:28:43 +0000588// Frame structure (conforms InternalFrame structure):
589// -- code
590// -- SMI maker
591// -- function (slot is called "context")
592// -- frame base
593Object** Debug::SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
594 Handle<Code> code) {
595 ASSERT(bottom_js_frame->is_java_script());
596
597 Address fp = bottom_js_frame->fp();
598
599 // Move function pointer into "context" slot.
600 Memory::Object_at(fp + StandardFrameConstants::kContextOffset) =
601 Memory::Object_at(fp + JavaScriptFrameConstants::kFunctionOffset);
602
603 Memory::Object_at(fp + InternalFrameConstants::kCodeOffset) = *code;
604 Memory::Object_at(fp + StandardFrameConstants::kMarkerOffset) =
605 Smi::FromInt(StackFrame::INTERNAL);
606
607 return reinterpret_cast<Object**>(&Memory::Object_at(
608 fp + StandardFrameConstants::kContextOffset));
609}
610
611const int Debug::kFrameDropperFrameSize = 4;
612
613
614
615
616
kasper.lundbd3ec4e2008-07-09 11:06:54 +0000617// Default break enabled.
618bool Debug::disable_break_ = false;
619
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000620// Default call debugger on uncaught exception.
621bool Debug::break_on_exception_ = false;
622bool Debug::break_on_uncaught_exception_ = true;
623
624Handle<Context> Debug::debug_context_ = Handle<Context>();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000625Code* Debug::debug_break_return_ = NULL;
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +0000626Code* Debug::debug_break_slot_ = NULL;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000627
628
kasperl@chromium.org71affb52009-05-26 05:44:31 +0000629void ScriptCache::Add(Handle<Script> script) {
630 // Create an entry in the hash map for the script.
631 int id = Smi::cast(script->id())->value();
632 HashMap::Entry* entry =
633 HashMap::Lookup(reinterpret_cast<void*>(id), Hash(id), true);
634 if (entry->value != NULL) {
635 ASSERT(*script == *reinterpret_cast<Script**>(entry->value));
636 return;
637 }
638
639 // Globalize the script object, make it weak and use the location of the
640 // global handle as the value in the hash map.
641 Handle<Script> script_ =
642 Handle<Script>::cast((GlobalHandles::Create(*script)));
643 GlobalHandles::MakeWeak(reinterpret_cast<Object**>(script_.location()),
644 this, ScriptCache::HandleWeakScript);
645 entry->value = script_.location();
646}
647
648
649Handle<FixedArray> ScriptCache::GetScripts() {
650 Handle<FixedArray> instances = Factory::NewFixedArray(occupancy());
651 int count = 0;
652 for (HashMap::Entry* entry = Start(); entry != NULL; entry = Next(entry)) {
653 ASSERT(entry->value != NULL);
654 if (entry->value != NULL) {
655 instances->set(count, *reinterpret_cast<Script**>(entry->value));
656 count++;
657 }
658 }
659 return instances;
660}
661
662
663void ScriptCache::ProcessCollectedScripts() {
664 for (int i = 0; i < collected_scripts_.length(); i++) {
665 Debugger::OnScriptCollected(collected_scripts_[i]);
666 }
667 collected_scripts_.Clear();
668}
669
670
671void ScriptCache::Clear() {
672 // Iterate the script cache to get rid of all the weak handles.
673 for (HashMap::Entry* entry = Start(); entry != NULL; entry = Next(entry)) {
674 ASSERT(entry != NULL);
675 Object** location = reinterpret_cast<Object**>(entry->value);
676 ASSERT((*location)->IsScript());
677 GlobalHandles::ClearWeakness(location);
678 GlobalHandles::Destroy(location);
679 }
680 // Clear the content of the hash map.
681 HashMap::Clear();
682}
683
684
685void ScriptCache::HandleWeakScript(v8::Persistent<v8::Value> obj, void* data) {
686 ScriptCache* script_cache = reinterpret_cast<ScriptCache*>(data);
687 // Find the location of the global handle.
688 Script** location =
689 reinterpret_cast<Script**>(Utils::OpenHandle(*obj).location());
690 ASSERT((*location)->IsScript());
691
692 // Remove the entry from the cache.
693 int id = Smi::cast((*location)->id())->value();
694 script_cache->Remove(reinterpret_cast<void*>(id), Hash(id));
695 script_cache->collected_scripts_.Add(id);
696
697 // Clear the weak handle.
698 obj.Dispose();
699 obj.Clear();
700}
701
702
703void Debug::Setup(bool create_heap_objects) {
704 ThreadInit();
705 if (create_heap_objects) {
kasperl@chromium.org71affb52009-05-26 05:44:31 +0000706 // Get code to handle debug break on return.
707 debug_break_return_ =
708 Builtins::builtin(Builtins::Return_DebugBreak);
709 ASSERT(debug_break_return_->IsCode());
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +0000710 // Get code to handle debug break in debug break slots.
711 debug_break_slot_ =
712 Builtins::builtin(Builtins::Slot_DebugBreak);
713 ASSERT(debug_break_slot_->IsCode());
kasperl@chromium.org71affb52009-05-26 05:44:31 +0000714 }
715}
716
717
kasperl@chromium.org5a8ca6c2008-10-23 13:57:19 +0000718void Debug::HandleWeakDebugInfo(v8::Persistent<v8::Value> obj, void* data) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000719 DebugInfoListNode* node = reinterpret_cast<DebugInfoListNode*>(data);
kmillikin@chromium.org69ea3962010-07-05 11:01:40 +0000720 // We need to clear all breakpoints associated with the function to restore
721 // original code and avoid patching the code twice later because
722 // the function will live in the heap until next gc, and can be found by
723 // Runtime::FindSharedFunctionInfoInScript.
724 BreakLocationIterator it(node->debug_info(), ALL_BREAK_LOCATIONS);
725 it.ClearAllDebugBreak();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000726 RemoveDebugInfo(node->debug_info());
727#ifdef DEBUG
728 node = Debug::debug_info_list_;
729 while (node != NULL) {
730 ASSERT(node != reinterpret_cast<DebugInfoListNode*>(data));
731 node = node->next();
732 }
733#endif
734}
735
736
737DebugInfoListNode::DebugInfoListNode(DebugInfo* debug_info): next_(NULL) {
738 // Globalize the request debug info object and make it weak.
739 debug_info_ = Handle<DebugInfo>::cast((GlobalHandles::Create(debug_info)));
740 GlobalHandles::MakeWeak(reinterpret_cast<Object**>(debug_info_.location()),
741 this, Debug::HandleWeakDebugInfo);
742}
743
744
745DebugInfoListNode::~DebugInfoListNode() {
746 GlobalHandles::Destroy(reinterpret_cast<Object**>(debug_info_.location()));
747}
748
749
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000750bool Debug::CompileDebuggerScript(int index) {
751 HandleScope scope;
752
kasper.lund44510672008-07-25 07:37:58 +0000753 // Bail out if the index is invalid.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000754 if (index == -1) {
755 return false;
756 }
kasper.lund44510672008-07-25 07:37:58 +0000757
758 // Find source and name for the requested script.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000759 Handle<String> source_code = Bootstrapper::NativesSourceLookup(index);
760 Vector<const char> name = Natives::GetScriptName(index);
761 Handle<String> script_name = Factory::NewStringFromAscii(name);
762
763 // Compile the script.
764 bool allow_natives_syntax = FLAG_allow_natives_syntax;
765 FLAG_allow_natives_syntax = true;
kmillikin@chromium.org5d8f0e62010-03-24 08:21:20 +0000766 Handle<SharedFunctionInfo> function_info;
767 function_info = Compiler::Compile(source_code,
768 script_name,
769 0, 0, NULL, NULL,
770 Handle<String>::null(),
771 NATIVES_CODE);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000772 FLAG_allow_natives_syntax = allow_natives_syntax;
773
774 // Silently ignore stack overflows during compilation.
kmillikin@chromium.org5d8f0e62010-03-24 08:21:20 +0000775 if (function_info.is_null()) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000776 ASSERT(Top::has_pending_exception());
777 Top::clear_pending_exception();
778 return false;
779 }
780
kmillikin@chromium.org5d8f0e62010-03-24 08:21:20 +0000781 // Execute the shared function in the debugger context.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000782 Handle<Context> context = Top::global_context();
kasper.lund44510672008-07-25 07:37:58 +0000783 bool caught_exception = false;
784 Handle<JSFunction> function =
kmillikin@chromium.org5d8f0e62010-03-24 08:21:20 +0000785 Factory::NewFunctionFromSharedFunctionInfo(function_info, context);
kasper.lund44510672008-07-25 07:37:58 +0000786 Handle<Object> result =
787 Execution::TryCall(function, Handle<Object>(context->global()),
788 0, NULL, &caught_exception);
789
790 // Check for caught exceptions.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000791 if (caught_exception) {
ager@chromium.org9258b6b2008-09-11 09:11:10 +0000792 Handle<Object> message = MessageHandler::MakeMessageObject(
ager@chromium.org18ad94b2009-09-02 08:22:29 +0000793 "error_loading_debugger", NULL, Vector<Handle<Object> >::empty(),
ager@chromium.org6a2b0aa2010-07-13 20:58:03 +0000794 Handle<String>(), Handle<JSArray>());
ager@chromium.org9258b6b2008-09-11 09:11:10 +0000795 MessageHandler::ReportMessage(NULL, message);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000796 return false;
797 }
798
kasper.lund44510672008-07-25 07:37:58 +0000799 // Mark this script as native and return successfully.
800 Handle<Script> script(Script::cast(function->shared()->script()));
ager@chromium.orge2902be2009-06-08 12:21:35 +0000801 script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000802 return true;
803}
804
805
806bool Debug::Load() {
807 // Return if debugger is already loaded.
kasper.lund212ac232008-07-16 07:07:30 +0000808 if (IsLoaded()) return true;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000809
kasper.lund44510672008-07-25 07:37:58 +0000810 // Bail out if we're already in the process of compiling the native
811 // JavaScript source code for the debugger.
mads.s.agercbaa0602008-08-14 13:41:48 +0000812 if (Debugger::compiling_natives() || Debugger::is_loading_debugger())
813 return false;
814 Debugger::set_loading_debugger(true);
kasper.lund44510672008-07-25 07:37:58 +0000815
816 // Disable breakpoints and interrupts while compiling and running the
817 // debugger scripts including the context creation code.
818 DisableBreak disable(true);
819 PostponeInterruptsScope postpone;
820
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000821 // Create the debugger context.
822 HandleScope scope;
kasper.lund44510672008-07-25 07:37:58 +0000823 Handle<Context> context =
824 Bootstrapper::CreateEnvironment(Handle<Object>::null(),
825 v8::Handle<ObjectTemplate>(),
826 NULL);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000827
kasper.lund44510672008-07-25 07:37:58 +0000828 // Use the debugger context.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000829 SaveContext save;
kasper.lund44510672008-07-25 07:37:58 +0000830 Top::set_context(*context);
kasper.lund44510672008-07-25 07:37:58 +0000831
832 // Expose the builtins object in the debugger context.
833 Handle<String> key = Factory::LookupAsciiSymbol("builtins");
834 Handle<GlobalObject> global = Handle<GlobalObject>(context->global());
835 SetProperty(global, key, Handle<Object>(global->builtins()), NONE);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000836
837 // Compile the JavaScript for the debugger in the debugger context.
838 Debugger::set_compiling_natives(true);
kasper.lund44510672008-07-25 07:37:58 +0000839 bool caught_exception =
840 !CompileDebuggerScript(Natives::GetIndex("mirror")) ||
841 !CompileDebuggerScript(Natives::GetIndex("debug"));
ager@chromium.orgce5e87b2010-03-10 10:24:18 +0000842
843 if (FLAG_enable_liveedit) {
844 caught_exception = caught_exception ||
845 !CompileDebuggerScript(Natives::GetIndex("liveedit"));
846 }
847
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000848 Debugger::set_compiling_natives(false);
849
mads.s.agercbaa0602008-08-14 13:41:48 +0000850 // Make sure we mark the debugger as not loading before we might
851 // return.
852 Debugger::set_loading_debugger(false);
853
kasper.lund44510672008-07-25 07:37:58 +0000854 // Check for caught exceptions.
855 if (caught_exception) return false;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000856
857 // Debugger loaded.
kasper.lund44510672008-07-25 07:37:58 +0000858 debug_context_ = Handle<Context>::cast(GlobalHandles::Create(*context));
kasperl@chromium.org71affb52009-05-26 05:44:31 +0000859
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000860 return true;
861}
862
863
864void Debug::Unload() {
865 // Return debugger is not loaded.
866 if (!IsLoaded()) {
867 return;
868 }
869
kasperl@chromium.org71affb52009-05-26 05:44:31 +0000870 // Clear the script cache.
871 DestroyScriptCache();
872
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000873 // Clear debugger context global handle.
874 GlobalHandles::Destroy(reinterpret_cast<Object**>(debug_context_.location()));
875 debug_context_ = Handle<Context>();
876}
877
878
kasperl@chromium.org7be3c992009-03-12 07:19:55 +0000879// Set the flag indicating that preemption happened during debugging.
880void Debug::PreemptionWhileInDebugger() {
881 ASSERT(InDebugger());
sgjesse@chromium.org755c5b12009-05-29 11:04:38 +0000882 Debug::set_interrupts_pending(PREEMPT);
kasperl@chromium.org7be3c992009-03-12 07:19:55 +0000883}
884
885
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000886void Debug::Iterate(ObjectVisitor* v) {
vegorov@chromium.org26c16f82010-08-11 13:41:03 +0000887 v->VisitPointer(BitCast<Object**>(&(debug_break_return_)));
888 v->VisitPointer(BitCast<Object**>(&(debug_break_slot_)));
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000889}
890
891
892Object* Debug::Break(Arguments args) {
893 HandleScope scope;
mads.s.ager31e71382008-08-13 09:32:07 +0000894 ASSERT(args.length() == 0);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000895
kmillikin@chromium.org69ea3962010-07-05 11:01:40 +0000896 thread_local_.frame_drop_mode_ = FRAMES_UNTOUCHED;
ager@chromium.org357bf652010-04-12 11:30:10 +0000897
kasper.lundbd3ec4e2008-07-09 11:06:54 +0000898 // Get the top-most JavaScript frame.
899 JavaScriptFrameIterator it;
900 JavaScriptFrame* frame = it.frame();
901
902 // Just continue if breaks are disabled or debugger cannot be loaded.
903 if (disable_break() || !Load()) {
904 SetAfterBreakTarget(frame);
mads.s.ager31e71382008-08-13 09:32:07 +0000905 return Heap::undefined_value();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000906 }
907
kasperl@chromium.org41044eb2008-10-06 08:24:46 +0000908 // Enter the debugger.
909 EnterDebugger debugger;
910 if (debugger.FailedToEnter()) {
911 return Heap::undefined_value();
912 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000913
kasper.lund44510672008-07-25 07:37:58 +0000914 // Postpone interrupt during breakpoint processing.
915 PostponeInterruptsScope postpone;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000916
917 // Get the debug info (create it if it does not exist).
918 Handle<SharedFunctionInfo> shared =
919 Handle<SharedFunctionInfo>(JSFunction::cast(frame->function())->shared());
920 Handle<DebugInfo> debug_info = GetDebugInfo(shared);
921
922 // Find the break point where execution has stopped.
923 BreakLocationIterator break_location_iterator(debug_info,
924 ALL_BREAK_LOCATIONS);
925 break_location_iterator.FindBreakLocationFromAddress(frame->pc());
926
927 // Check whether step next reached a new statement.
928 if (!StepNextContinue(&break_location_iterator, frame)) {
929 // Decrease steps left if performing multiple steps.
930 if (thread_local_.step_count_ > 0) {
931 thread_local_.step_count_--;
932 }
933 }
934
935 // If there is one or more real break points check whether any of these are
936 // triggered.
937 Handle<Object> break_points_hit(Heap::undefined_value());
938 if (break_location_iterator.HasBreakPoint()) {
939 Handle<Object> break_point_objects =
940 Handle<Object>(break_location_iterator.BreakPointObjects());
941 break_points_hit = CheckBreakPoints(break_point_objects);
942 }
943
ager@chromium.orga1645e22009-09-09 19:27:10 +0000944 // If step out is active skip everything until the frame where we need to step
945 // out to is reached, unless real breakpoint is hit.
946 if (Debug::StepOutActive() && frame->fp() != Debug::step_out_fp() &&
947 break_points_hit->IsUndefined() ) {
948 // Step count should always be 0 for StepOut.
949 ASSERT(thread_local_.step_count_ == 0);
950 } else if (!break_points_hit->IsUndefined() ||
951 (thread_local_.last_step_action_ != StepNone &&
952 thread_local_.step_count_ == 0)) {
953 // Notify debugger if a real break point is triggered or if performing
954 // single stepping with no more steps to perform. Otherwise do another step.
955
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000956 // Clear all current stepping setup.
957 ClearStepping();
958
959 // Notify the debug event listeners.
ager@chromium.orgbb29dc92009-03-24 13:25:23 +0000960 Debugger::OnDebugBreak(break_points_hit, false);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000961 } else if (thread_local_.last_step_action_ != StepNone) {
962 // Hold on to last step action as it is cleared by the call to
963 // ClearStepping.
964 StepAction step_action = thread_local_.last_step_action_;
965 int step_count = thread_local_.step_count_;
966
967 // Clear all current stepping setup.
968 ClearStepping();
969
970 // Set up for the remaining steps.
971 PrepareStep(step_action, step_count);
972 }
973
kmillikin@chromium.org69ea3962010-07-05 11:01:40 +0000974 if (thread_local_.frame_drop_mode_ == FRAMES_UNTOUCHED) {
975 SetAfterBreakTarget(frame);
976 } else if (thread_local_.frame_drop_mode_ == FRAME_DROPPED_IN_IC_CALL) {
977 // We must have been calling IC stub. Do not go there anymore.
ager@chromium.org357bf652010-04-12 11:30:10 +0000978 Code* plain_return = Builtins::builtin(Builtins::PlainReturn_LiveEdit);
979 thread_local_.after_break_target_ = plain_return->entry();
kmillikin@chromium.org69ea3962010-07-05 11:01:40 +0000980 } else if (thread_local_.frame_drop_mode_ ==
981 FRAME_DROPPED_IN_DEBUG_SLOT_CALL) {
982 // Debug break slot stub does not return normally, instead it manually
983 // cleans the stack and jumps. We should patch the jump address.
984 Code* plain_return = Builtins::builtin(Builtins::FrameDropper_LiveEdit);
985 thread_local_.after_break_target_ = plain_return->entry();
986 } else if (thread_local_.frame_drop_mode_ == FRAME_DROPPED_IN_DIRECT_CALL) {
987 // Nothing to do, after_break_target is not used here.
ager@chromium.org357bf652010-04-12 11:30:10 +0000988 } else {
kmillikin@chromium.org69ea3962010-07-05 11:01:40 +0000989 UNREACHABLE();
ager@chromium.org357bf652010-04-12 11:30:10 +0000990 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000991
mads.s.ager31e71382008-08-13 09:32:07 +0000992 return Heap::undefined_value();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +0000993}
994
995
996// Check the break point objects for whether one or more are actually
997// triggered. This function returns a JSArray with the break point objects
998// which is triggered.
999Handle<Object> Debug::CheckBreakPoints(Handle<Object> break_point_objects) {
1000 int break_points_hit_count = 0;
1001 Handle<JSArray> break_points_hit = Factory::NewJSArray(1);
1002
v8.team.kasperl727e9952008-09-02 14:56:44 +00001003 // If there are multiple break points they are in a FixedArray.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001004 ASSERT(!break_point_objects->IsUndefined());
1005 if (break_point_objects->IsFixedArray()) {
1006 Handle<FixedArray> array(FixedArray::cast(*break_point_objects));
1007 for (int i = 0; i < array->length(); i++) {
1008 Handle<Object> o(array->get(i));
1009 if (CheckBreakPoint(o)) {
1010 break_points_hit->SetElement(break_points_hit_count++, *o);
1011 }
1012 }
1013 } else {
1014 if (CheckBreakPoint(break_point_objects)) {
1015 break_points_hit->SetElement(break_points_hit_count++,
1016 *break_point_objects);
1017 }
1018 }
1019
1020 // Return undefined if no break points where triggered.
1021 if (break_points_hit_count == 0) {
1022 return Factory::undefined_value();
1023 }
1024 return break_points_hit;
1025}
1026
1027
1028// Check whether a single break point object is triggered.
1029bool Debug::CheckBreakPoint(Handle<Object> break_point_object) {
ager@chromium.org381abbb2009-02-25 13:23:22 +00001030 HandleScope scope;
1031
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001032 // Ignore check if break point object is not a JSObject.
1033 if (!break_point_object->IsJSObject()) return true;
1034
1035 // Get the function CheckBreakPoint (defined in debug.js).
1036 Handle<JSFunction> check_break_point =
1037 Handle<JSFunction>(JSFunction::cast(
1038 debug_context()->global()->GetProperty(
1039 *Factory::LookupAsciiSymbol("IsBreakPointTriggered"))));
1040
1041 // Get the break id as an object.
kasperl@chromium.org7be3c992009-03-12 07:19:55 +00001042 Handle<Object> break_id = Factory::NewNumberFromInt(Debug::break_id());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001043
1044 // Call HandleBreakPointx.
1045 bool caught_exception = false;
1046 const int argc = 2;
1047 Object** argv[argc] = {
1048 break_id.location(),
1049 reinterpret_cast<Object**>(break_point_object.location())
1050 };
1051 Handle<Object> result = Execution::TryCall(check_break_point,
1052 Top::builtins(), argc, argv,
1053 &caught_exception);
1054
1055 // If exception or non boolean result handle as not triggered
1056 if (caught_exception || !result->IsBoolean()) {
1057 return false;
1058 }
1059
1060 // Return whether the break point is triggered.
1061 return *result == Heap::true_value();
1062}
1063
1064
1065// Check whether the function has debug information.
1066bool Debug::HasDebugInfo(Handle<SharedFunctionInfo> shared) {
1067 return !shared->debug_info()->IsUndefined();
1068}
1069
1070
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001071// Return the debug info for this function. EnsureDebugInfo must be called
1072// prior to ensure the debug info has been generated for shared.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001073Handle<DebugInfo> Debug::GetDebugInfo(Handle<SharedFunctionInfo> shared) {
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001074 ASSERT(HasDebugInfo(shared));
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001075 return Handle<DebugInfo>(DebugInfo::cast(shared->debug_info()));
1076}
1077
1078
1079void Debug::SetBreakPoint(Handle<SharedFunctionInfo> shared,
ricow@chromium.org5ad5ace2010-06-23 09:06:43 +00001080 Handle<Object> break_point_object,
1081 int* source_position) {
ager@chromium.org381abbb2009-02-25 13:23:22 +00001082 HandleScope scope;
1083
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001084 if (!EnsureDebugInfo(shared)) {
1085 // Return if retrieving debug info failed.
1086 return;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001087 }
1088
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001089 Handle<DebugInfo> debug_info = GetDebugInfo(shared);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001090 // Source positions starts with zero.
1091 ASSERT(source_position >= 0);
1092
1093 // Find the break point and change it.
1094 BreakLocationIterator it(debug_info, SOURCE_BREAK_LOCATIONS);
ricow@chromium.org5ad5ace2010-06-23 09:06:43 +00001095 it.FindBreakLocationFromPosition(*source_position);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001096 it.SetBreakPoint(break_point_object);
1097
ricow@chromium.org5ad5ace2010-06-23 09:06:43 +00001098 *source_position = it.position();
1099
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001100 // At least one active break point now.
1101 ASSERT(debug_info->GetBreakPointCount() > 0);
1102}
1103
1104
1105void Debug::ClearBreakPoint(Handle<Object> break_point_object) {
ager@chromium.org381abbb2009-02-25 13:23:22 +00001106 HandleScope scope;
1107
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001108 DebugInfoListNode* node = debug_info_list_;
1109 while (node != NULL) {
1110 Object* result = DebugInfo::FindBreakPointInfo(node->debug_info(),
1111 break_point_object);
1112 if (!result->IsUndefined()) {
1113 // Get information in the break point.
1114 BreakPointInfo* break_point_info = BreakPointInfo::cast(result);
1115 Handle<DebugInfo> debug_info = node->debug_info();
1116 Handle<SharedFunctionInfo> shared(debug_info->shared());
1117 int source_position = break_point_info->statement_position()->value();
1118
1119 // Source positions starts with zero.
1120 ASSERT(source_position >= 0);
1121
1122 // Find the break point and clear it.
1123 BreakLocationIterator it(debug_info, SOURCE_BREAK_LOCATIONS);
1124 it.FindBreakLocationFromPosition(source_position);
1125 it.ClearBreakPoint(break_point_object);
1126
1127 // If there are no more break points left remove the debug info for this
1128 // function.
1129 if (debug_info->GetBreakPointCount() == 0) {
1130 RemoveDebugInfo(debug_info);
1131 }
1132
1133 return;
1134 }
1135 node = node->next();
1136 }
1137}
1138
1139
ager@chromium.org381abbb2009-02-25 13:23:22 +00001140void Debug::ClearAllBreakPoints() {
1141 DebugInfoListNode* node = debug_info_list_;
1142 while (node != NULL) {
1143 // Remove all debug break code.
1144 BreakLocationIterator it(node->debug_info(), ALL_BREAK_LOCATIONS);
1145 it.ClearAllDebugBreak();
1146 node = node->next();
1147 }
1148
1149 // Remove all debug info.
1150 while (debug_info_list_ != NULL) {
1151 RemoveDebugInfo(debug_info_list_->debug_info());
1152 }
1153}
1154
1155
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001156void Debug::FloodWithOneShot(Handle<SharedFunctionInfo> shared) {
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001157 // Make sure the function has setup the debug info.
1158 if (!EnsureDebugInfo(shared)) {
1159 // Return if we failed to retrieve the debug info.
1160 return;
1161 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001162
1163 // Flood the function with break points.
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001164 BreakLocationIterator it(GetDebugInfo(shared), ALL_BREAK_LOCATIONS);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001165 while (!it.Done()) {
1166 it.SetOneShot();
1167 it.Next();
1168 }
1169}
1170
1171
1172void Debug::FloodHandlerWithOneShot() {
ager@chromium.org8bb60582008-12-11 12:02:20 +00001173 // Iterate through the JavaScript stack looking for handlers.
kasperl@chromium.org7be3c992009-03-12 07:19:55 +00001174 StackFrame::Id id = break_frame_id();
ager@chromium.org8bb60582008-12-11 12:02:20 +00001175 if (id == StackFrame::NO_ID) {
1176 // If there is no JavaScript stack don't do anything.
1177 return;
1178 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001179 for (JavaScriptFrameIterator it(id); !it.done(); it.Advance()) {
1180 JavaScriptFrame* frame = it.frame();
1181 if (frame->HasHandler()) {
1182 Handle<SharedFunctionInfo> shared =
1183 Handle<SharedFunctionInfo>(
1184 JSFunction::cast(frame->function())->shared());
1185 // Flood the function with the catch block with break points
1186 FloodWithOneShot(shared);
1187 return;
1188 }
1189 }
1190}
1191
1192
1193void Debug::ChangeBreakOnException(ExceptionBreakType type, bool enable) {
1194 if (type == BreakUncaughtException) {
1195 break_on_uncaught_exception_ = enable;
1196 } else {
1197 break_on_exception_ = enable;
1198 }
1199}
1200
1201
1202void Debug::PrepareStep(StepAction step_action, int step_count) {
1203 HandleScope scope;
1204 ASSERT(Debug::InDebugger());
1205
1206 // Remember this step action and count.
1207 thread_local_.last_step_action_ = step_action;
ager@chromium.orga1645e22009-09-09 19:27:10 +00001208 if (step_action == StepOut) {
1209 // For step out target frame will be found on the stack so there is no need
1210 // to set step counter for it. It's expected to always be 0 for StepOut.
1211 thread_local_.step_count_ = 0;
1212 } else {
1213 thread_local_.step_count_ = step_count;
1214 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001215
1216 // Get the frame where the execution has stopped and skip the debug frame if
1217 // any. The debug frame will only be present if execution was stopped due to
1218 // hitting a break point. In other situations (e.g. unhandled exception) the
1219 // debug frame is not present.
kasperl@chromium.org7be3c992009-03-12 07:19:55 +00001220 StackFrame::Id id = break_frame_id();
ager@chromium.org8bb60582008-12-11 12:02:20 +00001221 if (id == StackFrame::NO_ID) {
1222 // If there is no JavaScript stack don't do anything.
1223 return;
1224 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001225 JavaScriptFrameIterator frames_it(id);
1226 JavaScriptFrame* frame = frames_it.frame();
1227
1228 // First of all ensure there is one-shot break points in the top handler
1229 // if any.
1230 FloodHandlerWithOneShot();
1231
1232 // If the function on the top frame is unresolved perform step out. This will
1233 // be the case when calling unknown functions and having the debugger stopped
1234 // in an unhandled exception.
1235 if (!frame->function()->IsJSFunction()) {
1236 // Step out: Find the calling JavaScript frame and flood it with
1237 // breakpoints.
1238 frames_it.Advance();
1239 // Fill the function to return to with one-shot break points.
1240 JSFunction* function = JSFunction::cast(frames_it.frame()->function());
1241 FloodWithOneShot(Handle<SharedFunctionInfo>(function->shared()));
1242 return;
1243 }
1244
1245 // Get the debug info (create it if it does not exist).
1246 Handle<SharedFunctionInfo> shared =
1247 Handle<SharedFunctionInfo>(JSFunction::cast(frame->function())->shared());
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001248 if (!EnsureDebugInfo(shared)) {
1249 // Return if ensuring debug info failed.
1250 return;
1251 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001252 Handle<DebugInfo> debug_info = GetDebugInfo(shared);
1253
1254 // Find the break location where execution has stopped.
1255 BreakLocationIterator it(debug_info, ALL_BREAK_LOCATIONS);
1256 it.FindBreakLocationFromAddress(frame->pc());
1257
1258 // Compute whether or not the target is a call target.
kasperl@chromium.orge959c182009-07-27 08:59:04 +00001259 bool is_load_or_store = false;
1260 bool is_inline_cache_stub = false;
whesse@chromium.orge90029b2010-08-02 11:52:17 +00001261 bool is_at_restarted_function = false;
ager@chromium.orga1645e22009-09-09 19:27:10 +00001262 Handle<Code> call_function_stub;
ager@chromium.orga1645e22009-09-09 19:27:10 +00001263
whesse@chromium.orge90029b2010-08-02 11:52:17 +00001264 if (thread_local_.restarter_frame_function_pointer_ == NULL) {
1265 if (RelocInfo::IsCodeTarget(it.rinfo()->rmode())) {
1266 bool is_call_target = false;
1267 Address target = it.rinfo()->target_address();
1268 Code* code = Code::GetCodeFromTargetAddress(target);
1269 if (code->is_call_stub() || code->is_keyed_call_stub()) {
1270 is_call_target = true;
1271 }
1272 if (code->is_inline_cache_stub()) {
1273 is_inline_cache_stub = true;
1274 is_load_or_store = !is_call_target;
1275 }
1276
1277 // Check if target code is CallFunction stub.
1278 Code* maybe_call_function_stub = code;
1279 // If there is a breakpoint at this line look at the original code to
1280 // check if it is a CallFunction stub.
1281 if (it.IsDebugBreak()) {
1282 Address original_target = it.original_rinfo()->target_address();
1283 maybe_call_function_stub =
1284 Code::GetCodeFromTargetAddress(original_target);
1285 }
1286 if (maybe_call_function_stub->kind() == Code::STUB &&
1287 maybe_call_function_stub->major_key() == CodeStub::CallFunction) {
1288 // Save reference to the code as we may need it to find out arguments
1289 // count for 'step in' later.
1290 call_function_stub = Handle<Code>(maybe_call_function_stub);
1291 }
ager@chromium.orga1645e22009-09-09 19:27:10 +00001292 }
whesse@chromium.orge90029b2010-08-02 11:52:17 +00001293 } else {
1294 is_at_restarted_function = true;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001295 }
1296
v8.team.kasperl727e9952008-09-02 14:56:44 +00001297 // If this is the last break code target step out is the only possibility.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001298 if (it.IsExit() || step_action == StepOut) {
ager@chromium.orga1645e22009-09-09 19:27:10 +00001299 if (step_action == StepOut) {
1300 // Skip step_count frames starting with the current one.
1301 while (step_count-- > 0 && !frames_it.done()) {
1302 frames_it.Advance();
1303 }
1304 } else {
1305 ASSERT(it.IsExit());
1306 frames_it.Advance();
1307 }
1308 // Skip builtin functions on the stack.
1309 while (!frames_it.done() &&
1310 JSFunction::cast(frames_it.frame()->function())->IsBuiltin()) {
1311 frames_it.Advance();
1312 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001313 // Step out: If there is a JavaScript caller frame, we need to
1314 // flood it with breakpoints.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001315 if (!frames_it.done()) {
1316 // Fill the function to return to with one-shot break points.
1317 JSFunction* function = JSFunction::cast(frames_it.frame()->function());
1318 FloodWithOneShot(Handle<SharedFunctionInfo>(function->shared()));
ager@chromium.orga1645e22009-09-09 19:27:10 +00001319 // Set target frame pointer.
1320 ActivateStepOut(frames_it.frame());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001321 }
ager@chromium.orga1645e22009-09-09 19:27:10 +00001322 } else if (!(is_inline_cache_stub || RelocInfo::IsConstructCall(it.rmode()) ||
whesse@chromium.orge90029b2010-08-02 11:52:17 +00001323 !call_function_stub.is_null() || is_at_restarted_function)
kasperl@chromium.orge959c182009-07-27 08:59:04 +00001324 || step_action == StepNext || step_action == StepMin) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001325 // Step next or step min.
1326
1327 // Fill the current function with one-shot break points.
1328 FloodWithOneShot(shared);
1329
1330 // Remember source position and frame to handle step next.
1331 thread_local_.last_statement_position_ =
1332 debug_info->code()->SourceStatementPosition(frame->pc());
1333 thread_local_.last_fp_ = frame->fp();
1334 } else {
whesse@chromium.orge90029b2010-08-02 11:52:17 +00001335 // If there's restarter frame on top of the stack, just get the pointer
1336 // to function which is going to be restarted.
1337 if (is_at_restarted_function) {
1338 Handle<JSFunction> restarted_function(
1339 JSFunction::cast(*thread_local_.restarter_frame_function_pointer_));
1340 Handle<SharedFunctionInfo> restarted_shared(
1341 restarted_function->shared());
1342 FloodWithOneShot(restarted_shared);
1343 } else if (!call_function_stub.is_null()) {
1344 // If it's CallFunction stub ensure target function is compiled and flood
1345 // it with one shot breakpoints.
1346
ager@chromium.orga1645e22009-09-09 19:27:10 +00001347 // Find out number of arguments from the stub minor key.
1348 // Reverse lookup required as the minor key cannot be retrieved
1349 // from the code object.
1350 Handle<Object> obj(
1351 Heap::code_stubs()->SlowReverseLookup(*call_function_stub));
1352 ASSERT(*obj != Heap::undefined_value());
1353 ASSERT(obj->IsSmi());
1354 // Get the STUB key and extract major and minor key.
1355 uint32_t key = Smi::cast(*obj)->value();
1356 // Argc in the stub is the number of arguments passed - not the
1357 // expected arguments of the called function.
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00001358 int call_function_arg_count =
1359 CallFunctionStub::ExtractArgcFromMinorKey(
1360 CodeStub::MinorKeyFromKey(key));
ager@chromium.orga1645e22009-09-09 19:27:10 +00001361 ASSERT(call_function_stub->major_key() ==
1362 CodeStub::MajorKeyFromKey(key));
1363
1364 // Find target function on the expression stack.
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00001365 // Expression stack looks like this (top to bottom):
ager@chromium.orga1645e22009-09-09 19:27:10 +00001366 // argN
1367 // ...
1368 // arg0
1369 // Receiver
1370 // Function to call
1371 int expressions_count = frame->ComputeExpressionsCount();
1372 ASSERT(expressions_count - 2 - call_function_arg_count >= 0);
1373 Object* fun = frame->GetExpression(
1374 expressions_count - 2 - call_function_arg_count);
1375 if (fun->IsJSFunction()) {
1376 Handle<JSFunction> js_function(JSFunction::cast(fun));
1377 // Don't step into builtins.
1378 if (!js_function->IsBuiltin()) {
1379 // It will also compile target function if it's not compiled yet.
1380 FloodWithOneShot(Handle<SharedFunctionInfo>(js_function->shared()));
1381 }
1382 }
1383 }
1384
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001385 // Fill the current function with one-shot break points even for step in on
1386 // a call target as the function called might be a native function for
kasperl@chromium.orge959c182009-07-27 08:59:04 +00001387 // which step in will not stop. It also prepares for stepping in
1388 // getters/setters.
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001389 FloodWithOneShot(shared);
1390
kasperl@chromium.orge959c182009-07-27 08:59:04 +00001391 if (is_load_or_store) {
1392 // Remember source position and frame to handle step in getter/setter. If
1393 // there is a custom getter/setter it will be handled in
1394 // Object::Get/SetPropertyWithCallback, otherwise the step action will be
1395 // propagated on the next Debug::Break.
1396 thread_local_.last_statement_position_ =
1397 debug_info->code()->SourceStatementPosition(frame->pc());
1398 thread_local_.last_fp_ = frame->fp();
1399 }
1400
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001401 // Step in or Step in min
1402 it.PrepareStepIn();
1403 ActivateStepIn(frame);
1404 }
1405}
1406
1407
1408// Check whether the current debug break should be reported to the debugger. It
1409// is used to have step next and step in only report break back to the debugger
1410// if on a different frame or in a different statement. In some situations
1411// there will be several break points in the same statement when the code is
v8.team.kasperl727e9952008-09-02 14:56:44 +00001412// flooded with one-shot break points. This function helps to perform several
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001413// steps before reporting break back to the debugger.
1414bool Debug::StepNextContinue(BreakLocationIterator* break_location_iterator,
1415 JavaScriptFrame* frame) {
1416 // If the step last action was step next or step in make sure that a new
1417 // statement is hit.
1418 if (thread_local_.last_step_action_ == StepNext ||
1419 thread_local_.last_step_action_ == StepIn) {
1420 // Never continue if returning from function.
1421 if (break_location_iterator->IsExit()) return false;
1422
1423 // Continue if we are still on the same frame and in the same statement.
1424 int current_statement_position =
1425 break_location_iterator->code()->SourceStatementPosition(frame->pc());
1426 return thread_local_.last_fp_ == frame->fp() &&
ager@chromium.org236ad962008-09-25 09:45:57 +00001427 thread_local_.last_statement_position_ == current_statement_position;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001428 }
1429
1430 // No step next action - don't continue.
1431 return false;
1432}
1433
1434
1435// Check whether the code object at the specified address is a debug break code
1436// object.
1437bool Debug::IsDebugBreak(Address addr) {
ager@chromium.org8bb60582008-12-11 12:02:20 +00001438 Code* code = Code::GetCodeFromTargetAddress(addr);
kasper.lund7276f142008-07-30 08:49:36 +00001439 return code->ic_state() == DEBUG_BREAK;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001440}
1441
1442
1443// Check whether a code stub with the specified major key is a possible break
1444// point location when looking for source break locations.
1445bool Debug::IsSourceBreakStub(Code* code) {
1446 CodeStub::Major major_key = code->major_key();
1447 return major_key == CodeStub::CallFunction;
1448}
1449
1450
1451// Check whether a code stub with the specified major key is a possible break
1452// location.
1453bool Debug::IsBreakStub(Code* code) {
1454 CodeStub::Major major_key = code->major_key();
1455 return major_key == CodeStub::CallFunction ||
1456 major_key == CodeStub::StackCheck;
1457}
1458
1459
1460// Find the builtin to use for invoking the debug break
ager@chromium.org65dad4b2009-04-23 08:48:43 +00001461Handle<Code> Debug::FindDebugBreak(Handle<Code> code, RelocInfo::Mode mode) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001462 // Find the builtin debug break function matching the calling convention
1463 // used by the call site.
ager@chromium.org65dad4b2009-04-23 08:48:43 +00001464 if (code->is_inline_cache_stub()) {
ager@chromium.orgce5e87b2010-03-10 10:24:18 +00001465 switch (code->kind()) {
1466 case Code::CALL_IC:
lrn@chromium.org1af7e1b2010-06-07 11:12:01 +00001467 case Code::KEYED_CALL_IC:
1468 return ComputeCallDebugBreak(code->arguments_count(), code->kind());
ager@chromium.orgce5e87b2010-03-10 10:24:18 +00001469
1470 case Code::LOAD_IC:
1471 return Handle<Code>(Builtins::builtin(Builtins::LoadIC_DebugBreak));
1472
1473 case Code::STORE_IC:
1474 return Handle<Code>(Builtins::builtin(Builtins::StoreIC_DebugBreak));
1475
1476 case Code::KEYED_LOAD_IC:
1477 return Handle<Code>(
1478 Builtins::builtin(Builtins::KeyedLoadIC_DebugBreak));
1479
1480 case Code::KEYED_STORE_IC:
1481 return Handle<Code>(
1482 Builtins::builtin(Builtins::KeyedStoreIC_DebugBreak));
1483
1484 default:
1485 UNREACHABLE();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001486 }
1487 }
ager@chromium.org65dad4b2009-04-23 08:48:43 +00001488 if (RelocInfo::IsConstructCall(mode)) {
1489 Handle<Code> result =
1490 Handle<Code>(Builtins::builtin(Builtins::ConstructCall_DebugBreak));
1491 return result;
1492 }
1493 if (code->kind() == Code::STUB) {
1494 ASSERT(code->major_key() == CodeStub::CallFunction ||
1495 code->major_key() == CodeStub::StackCheck);
1496 Handle<Code> result =
1497 Handle<Code>(Builtins::builtin(Builtins::StubNoRegisters_DebugBreak));
1498 return result;
1499 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001500
1501 UNREACHABLE();
1502 return Handle<Code>::null();
1503}
1504
1505
1506// Simple function for returning the source positions for active break points.
1507Handle<Object> Debug::GetSourceBreakLocations(
1508 Handle<SharedFunctionInfo> shared) {
1509 if (!HasDebugInfo(shared)) return Handle<Object>(Heap::undefined_value());
1510 Handle<DebugInfo> debug_info = GetDebugInfo(shared);
1511 if (debug_info->GetBreakPointCount() == 0) {
1512 return Handle<Object>(Heap::undefined_value());
1513 }
1514 Handle<FixedArray> locations =
1515 Factory::NewFixedArray(debug_info->GetBreakPointCount());
1516 int count = 0;
1517 for (int i = 0; i < debug_info->break_points()->length(); i++) {
1518 if (!debug_info->break_points()->get(i)->IsUndefined()) {
1519 BreakPointInfo* break_point_info =
1520 BreakPointInfo::cast(debug_info->break_points()->get(i));
1521 if (break_point_info->GetBreakPointCount() > 0) {
1522 locations->set(count++, break_point_info->statement_position());
1523 }
1524 }
1525 }
1526 return locations;
1527}
1528
1529
kasperl@chromium.org7be3c992009-03-12 07:19:55 +00001530void Debug::NewBreak(StackFrame::Id break_frame_id) {
1531 thread_local_.break_frame_id_ = break_frame_id;
1532 thread_local_.break_id_ = ++thread_local_.break_count_;
1533}
1534
1535
1536void Debug::SetBreak(StackFrame::Id break_frame_id, int break_id) {
1537 thread_local_.break_frame_id_ = break_frame_id;
1538 thread_local_.break_id_ = break_id;
1539}
1540
1541
christian.plesner.hansen@gmail.com37abdec2009-01-06 14:43:28 +00001542// Handle stepping into a function.
1543void Debug::HandleStepIn(Handle<JSFunction> function,
kasperl@chromium.orgdefbd102009-07-13 14:04:26 +00001544 Handle<Object> holder,
christian.plesner.hansen@gmail.com37abdec2009-01-06 14:43:28 +00001545 Address fp,
1546 bool is_constructor) {
1547 // If the frame pointer is not supplied by the caller find it.
1548 if (fp == 0) {
1549 StackFrameIterator it;
1550 it.Advance();
1551 // For constructor functions skip another frame.
1552 if (is_constructor) {
1553 ASSERT(it.frame()->is_construct());
1554 it.Advance();
1555 }
1556 fp = it.frame()->fp();
1557 }
1558
1559 // Flood the function with one-shot break points if it is called from where
1560 // step into was requested.
1561 if (fp == Debug::step_in_fp()) {
1562 // Don't allow step into functions in the native context.
sgjesse@chromium.org0b6db592009-07-30 14:48:31 +00001563 if (!function->IsBuiltin()) {
kasperl@chromium.orgacae3782009-04-11 09:17:08 +00001564 if (function->shared()->code() ==
1565 Builtins::builtin(Builtins::FunctionApply) ||
1566 function->shared()->code() ==
1567 Builtins::builtin(Builtins::FunctionCall)) {
1568 // Handle function.apply and function.call separately to flood the
1569 // function to be called and not the code for Builtins::FunctionApply or
kasperl@chromium.orgdefbd102009-07-13 14:04:26 +00001570 // Builtins::FunctionCall. The receiver of call/apply is the target
1571 // function.
sgjesse@chromium.org0b6db592009-07-30 14:48:31 +00001572 if (!holder.is_null() && holder->IsJSFunction() &&
1573 !JSFunction::cast(*holder)->IsBuiltin()) {
kasperl@chromium.orgdefbd102009-07-13 14:04:26 +00001574 Handle<SharedFunctionInfo> shared_info(
1575 JSFunction::cast(*holder)->shared());
1576 Debug::FloodWithOneShot(shared_info);
kasperl@chromium.orgacae3782009-04-11 09:17:08 +00001577 }
1578 } else {
1579 Debug::FloodWithOneShot(Handle<SharedFunctionInfo>(function->shared()));
1580 }
christian.plesner.hansen@gmail.com37abdec2009-01-06 14:43:28 +00001581 }
1582 }
1583}
1584
1585
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001586void Debug::ClearStepping() {
1587 // Clear the various stepping setup.
1588 ClearOneShot();
1589 ClearStepIn();
ager@chromium.orga1645e22009-09-09 19:27:10 +00001590 ClearStepOut();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001591 ClearStepNext();
1592
1593 // Clear multiple step counter.
1594 thread_local_.step_count_ = 0;
1595}
1596
1597// Clears all the one-shot break points that are currently set. Normally this
1598// function is called each time a break point is hit as one shot break points
1599// are used to support stepping.
1600void Debug::ClearOneShot() {
1601 // The current implementation just runs through all the breakpoints. When the
v8.team.kasperl727e9952008-09-02 14:56:44 +00001602 // last break point for a function is removed that function is automatically
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001603 // removed from the list.
1604
1605 DebugInfoListNode* node = debug_info_list_;
1606 while (node != NULL) {
1607 BreakLocationIterator it(node->debug_info(), ALL_BREAK_LOCATIONS);
1608 while (!it.Done()) {
1609 it.ClearOneShot();
1610 it.Next();
1611 }
1612 node = node->next();
1613 }
1614}
1615
1616
1617void Debug::ActivateStepIn(StackFrame* frame) {
ager@chromium.orga1645e22009-09-09 19:27:10 +00001618 ASSERT(!StepOutActive());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001619 thread_local_.step_into_fp_ = frame->fp();
1620}
1621
1622
1623void Debug::ClearStepIn() {
1624 thread_local_.step_into_fp_ = 0;
1625}
1626
1627
ager@chromium.orga1645e22009-09-09 19:27:10 +00001628void Debug::ActivateStepOut(StackFrame* frame) {
1629 ASSERT(!StepInActive());
1630 thread_local_.step_out_fp_ = frame->fp();
1631}
1632
1633
1634void Debug::ClearStepOut() {
1635 thread_local_.step_out_fp_ = 0;
1636}
1637
1638
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001639void Debug::ClearStepNext() {
1640 thread_local_.last_step_action_ = StepNone;
ager@chromium.org236ad962008-09-25 09:45:57 +00001641 thread_local_.last_statement_position_ = RelocInfo::kNoPosition;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001642 thread_local_.last_fp_ = 0;
1643}
1644
1645
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001646// Ensures the debug information is present for shared.
1647bool Debug::EnsureDebugInfo(Handle<SharedFunctionInfo> shared) {
1648 // Return if we already have the debug info for shared.
1649 if (HasDebugInfo(shared)) return true;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001650
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001651 // Ensure shared in compiled. Return false if this failed.
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00001652 if (!EnsureCompiled(shared, CLEAR_EXCEPTION)) return false;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001653
1654 // Create the debug info object.
v8.team.kasperl727e9952008-09-02 14:56:44 +00001655 Handle<DebugInfo> debug_info = Factory::NewDebugInfo(shared);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001656
1657 // Add debug info to the list.
1658 DebugInfoListNode* node = new DebugInfoListNode(*debug_info);
1659 node->set_next(debug_info_list_);
1660 debug_info_list_ = node;
1661
1662 // Now there is at least one break point.
1663 has_break_points_ = true;
1664
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001665 return true;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001666}
1667
1668
1669void Debug::RemoveDebugInfo(Handle<DebugInfo> debug_info) {
1670 ASSERT(debug_info_list_ != NULL);
1671 // Run through the debug info objects to find this one and remove it.
1672 DebugInfoListNode* prev = NULL;
1673 DebugInfoListNode* current = debug_info_list_;
1674 while (current != NULL) {
1675 if (*current->debug_info() == *debug_info) {
1676 // Unlink from list. If prev is NULL we are looking at the first element.
1677 if (prev == NULL) {
1678 debug_info_list_ = current->next();
1679 } else {
1680 prev->set_next(current->next());
1681 }
1682 current->debug_info()->shared()->set_debug_info(Heap::undefined_value());
1683 delete current;
1684
1685 // If there are no more debug info objects there are not more break
1686 // points.
1687 has_break_points_ = debug_info_list_ != NULL;
1688
1689 return;
1690 }
1691 // Move to next in list.
1692 prev = current;
1693 current = current->next();
1694 }
1695 UNREACHABLE();
1696}
1697
1698
1699void Debug::SetAfterBreakTarget(JavaScriptFrame* frame) {
ager@chromium.org381abbb2009-02-25 13:23:22 +00001700 HandleScope scope;
1701
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001702 // Get the executing function in which the debug break occurred.
1703 Handle<SharedFunctionInfo> shared =
1704 Handle<SharedFunctionInfo>(JSFunction::cast(frame->function())->shared());
kasper.lundbd3ec4e2008-07-09 11:06:54 +00001705 if (!EnsureDebugInfo(shared)) {
1706 // Return if we failed to retrieve the debug info.
1707 return;
1708 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001709 Handle<DebugInfo> debug_info = GetDebugInfo(shared);
1710 Handle<Code> code(debug_info->code());
1711 Handle<Code> original_code(debug_info->original_code());
1712#ifdef DEBUG
1713 // Get the code which is actually executing.
kasperl@chromium.org061ef742009-02-27 12:16:20 +00001714 Handle<Code> frame_code(frame->code());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001715 ASSERT(frame_code.is_identical_to(code));
1716#endif
1717
1718 // Find the call address in the running code. This address holds the call to
1719 // either a DebugBreakXXX or to the debug break return entry code if the
1720 // break point is still active after processing the break point.
ager@chromium.org4af710e2009-09-15 12:20:11 +00001721 Address addr = frame->pc() - Assembler::kCallTargetAddressOffset;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001722
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +00001723 // Check if the location is at JS exit or debug break slot.
ager@chromium.orga1645e22009-09-09 19:27:10 +00001724 bool at_js_return = false;
1725 bool break_at_js_return_active = false;
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +00001726 bool at_debug_break_slot = false;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001727 RelocIterator it(debug_info->code());
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +00001728 while (!it.done() && !at_js_return && !at_debug_break_slot) {
ager@chromium.org236ad962008-09-25 09:45:57 +00001729 if (RelocInfo::IsJSReturn(it.rinfo()->rmode())) {
ager@chromium.orga1645e22009-09-09 19:27:10 +00001730 at_js_return = (it.rinfo()->pc() ==
1731 addr - Assembler::kPatchReturnSequenceAddressOffset);
christian.plesner.hansen@gmail.com9d58c2b2009-10-16 11:48:38 +00001732 break_at_js_return_active = it.rinfo()->IsPatchedReturnSequence();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001733 }
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +00001734 if (RelocInfo::IsDebugBreakSlot(it.rinfo()->rmode())) {
1735 at_debug_break_slot = (it.rinfo()->pc() ==
1736 addr - Assembler::kPatchDebugBreakSlotAddressOffset);
1737 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001738 it.next();
1739 }
1740
1741 // Handle the jump to continue execution after break point depending on the
1742 // break location.
ager@chromium.orga1645e22009-09-09 19:27:10 +00001743 if (at_js_return) {
1744 // If the break point as return is still active jump to the corresponding
1745 // place in the original code. If not the break point was removed during
1746 // break point processing.
1747 if (break_at_js_return_active) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001748 addr += original_code->instruction_start() - code->instruction_start();
1749 }
1750
sgjesse@chromium.org911335c2009-08-19 12:59:44 +00001751 // Move back to where the call instruction sequence started.
1752 thread_local_.after_break_target_ =
1753 addr - Assembler::kPatchReturnSequenceAddressOffset;
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +00001754 } else if (at_debug_break_slot) {
1755 // Address of where the debug break slot starts.
1756 addr = addr - Assembler::kPatchDebugBreakSlotAddressOffset;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001757
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +00001758 // Continue just after the slot.
1759 thread_local_.after_break_target_ = addr + Assembler::kDebugBreakSlotLength;
1760 } else if (IsDebugBreak(Assembler::target_address_at(addr))) {
1761 // We now know that there is still a debug break call at the target address,
1762 // so the break point is still there and the original code will hold the
1763 // address to jump to in order to complete the call which is replaced by a
1764 // call to DebugBreakXXX.
1765
1766 // Find the corresponding address in the original code.
1767 addr += original_code->instruction_start() - code->instruction_start();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001768
1769 // Install jump to the call address in the original code. This will be the
1770 // call which was overwritten by the call to DebugBreakXXX.
1771 thread_local_.after_break_target_ = Assembler::target_address_at(addr);
vegorov@chromium.org2356e6f2010-06-09 09:38:56 +00001772 } else {
1773 // There is no longer a break point present. Don't try to look in the
1774 // original code as the running code will have the right address. This takes
1775 // care of the case where the last break point is removed from the function
1776 // and therefore no "original code" is available.
1777 thread_local_.after_break_target_ = Assembler::target_address_at(addr);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001778 }
1779}
1780
1781
ager@chromium.org2cc82ae2010-06-14 07:35:38 +00001782bool Debug::IsBreakAtReturn(JavaScriptFrame* frame) {
1783 HandleScope scope;
1784
1785 // Get the executing function in which the debug break occurred.
1786 Handle<SharedFunctionInfo> shared =
1787 Handle<SharedFunctionInfo>(JSFunction::cast(frame->function())->shared());
1788 if (!EnsureDebugInfo(shared)) {
1789 // Return if we failed to retrieve the debug info.
1790 return false;
1791 }
1792 Handle<DebugInfo> debug_info = GetDebugInfo(shared);
1793 Handle<Code> code(debug_info->code());
1794#ifdef DEBUG
1795 // Get the code which is actually executing.
1796 Handle<Code> frame_code(frame->code());
1797 ASSERT(frame_code.is_identical_to(code));
1798#endif
1799
1800 // Find the call address in the running code.
1801 Address addr = frame->pc() - Assembler::kCallTargetAddressOffset;
1802
1803 // Check if the location is at JS return.
1804 RelocIterator it(debug_info->code());
1805 while (!it.done()) {
1806 if (RelocInfo::IsJSReturn(it.rinfo()->rmode())) {
1807 return (it.rinfo()->pc() ==
1808 addr - Assembler::kPatchReturnSequenceAddressOffset);
1809 }
1810 it.next();
1811 }
1812 return false;
1813}
1814
1815
kmillikin@chromium.org69ea3962010-07-05 11:01:40 +00001816void Debug::FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
whesse@chromium.orge90029b2010-08-02 11:52:17 +00001817 FrameDropMode mode,
1818 Object** restarter_frame_function_pointer) {
kmillikin@chromium.org69ea3962010-07-05 11:01:40 +00001819 thread_local_.frame_drop_mode_ = mode;
ager@chromium.org357bf652010-04-12 11:30:10 +00001820 thread_local_.break_frame_id_ = new_break_frame_id;
whesse@chromium.orge90029b2010-08-02 11:52:17 +00001821 thread_local_.restarter_frame_function_pointer_ =
1822 restarter_frame_function_pointer;
ager@chromium.org357bf652010-04-12 11:30:10 +00001823}
1824
1825
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001826bool Debug::IsDebugGlobal(GlobalObject* global) {
1827 return IsLoaded() && global == Debug::debug_context()->global();
1828}
1829
1830
ager@chromium.org32912102009-01-16 10:38:43 +00001831void Debug::ClearMirrorCache() {
ager@chromium.org381abbb2009-02-25 13:23:22 +00001832 HandleScope scope;
ager@chromium.org32912102009-01-16 10:38:43 +00001833 ASSERT(Top::context() == *Debug::debug_context());
1834
1835 // Clear the mirror cache.
1836 Handle<String> function_name =
1837 Factory::LookupSymbol(CStrVector("ClearMirrorCache"));
1838 Handle<Object> fun(Top::global()->GetProperty(*function_name));
1839 ASSERT(fun->IsJSFunction());
1840 bool caught_exception;
1841 Handle<Object> js_object = Execution::TryCall(
1842 Handle<JSFunction>::cast(fun),
1843 Handle<JSObject>(Debug::debug_context()->global()),
1844 0, NULL, &caught_exception);
1845}
1846
1847
kasperl@chromium.org71affb52009-05-26 05:44:31 +00001848void Debug::CreateScriptCache() {
1849 HandleScope scope;
1850
1851 // Perform two GCs to get rid of all unreferenced scripts. The first GC gets
1852 // rid of all the cached script wrappers and the second gets rid of the
kmillikin@chromium.org5d8f0e62010-03-24 08:21:20 +00001853 // scripts which are no longer referenced.
ager@chromium.orgab99eea2009-08-25 07:05:41 +00001854 Heap::CollectAllGarbage(false);
1855 Heap::CollectAllGarbage(false);
kasperl@chromium.org71affb52009-05-26 05:44:31 +00001856
1857 ASSERT(script_cache_ == NULL);
1858 script_cache_ = new ScriptCache();
1859
1860 // Scan heap for Script objects.
1861 int count = 0;
1862 HeapIterator iterator;
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00001863 for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
sgjesse@chromium.org152a0b02009-10-07 13:50:16 +00001864 if (obj->IsScript() && Script::cast(obj)->HasValidSource()) {
kasperl@chromium.org71affb52009-05-26 05:44:31 +00001865 script_cache_->Add(Handle<Script>(Script::cast(obj)));
1866 count++;
1867 }
1868 }
1869}
1870
1871
1872void Debug::DestroyScriptCache() {
1873 // Get rid of the script cache if it was created.
1874 if (script_cache_ != NULL) {
1875 delete script_cache_;
1876 script_cache_ = NULL;
1877 }
1878}
1879
1880
1881void Debug::AddScriptToScriptCache(Handle<Script> script) {
1882 if (script_cache_ != NULL) {
1883 script_cache_->Add(script);
1884 }
1885}
1886
1887
1888Handle<FixedArray> Debug::GetLoadedScripts() {
1889 // Create and fill the script cache when the loaded scripts is requested for
1890 // the first time.
1891 if (script_cache_ == NULL) {
1892 CreateScriptCache();
1893 }
1894
1895 // If the script cache is not active just return an empty array.
1896 ASSERT(script_cache_ != NULL);
1897 if (script_cache_ == NULL) {
1898 Factory::NewFixedArray(0);
1899 }
1900
1901 // Perform GC to get unreferenced scripts evicted from the cache before
1902 // returning the content.
ager@chromium.orgab99eea2009-08-25 07:05:41 +00001903 Heap::CollectAllGarbage(false);
kasperl@chromium.org71affb52009-05-26 05:44:31 +00001904
1905 // Get the scripts from the cache.
1906 return script_cache_->GetScripts();
1907}
1908
1909
1910void Debug::AfterGarbageCollection() {
1911 // Generate events for collected scripts.
1912 if (script_cache_ != NULL) {
1913 script_cache_->ProcessCollectedScripts();
1914 }
1915}
1916
1917
ager@chromium.org71daaf62009-04-01 07:22:49 +00001918Mutex* Debugger::debugger_access_ = OS::CreateMutex();
iposva@chromium.org245aa852009-02-10 00:49:54 +00001919Handle<Object> Debugger::event_listener_ = Handle<Object>();
1920Handle<Object> Debugger::event_listener_data_ = Handle<Object>();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001921bool Debugger::compiling_natives_ = false;
mads.s.agercbaa0602008-08-14 13:41:48 +00001922bool Debugger::is_loading_debugger_ = false;
ager@chromium.org71daaf62009-04-01 07:22:49 +00001923bool Debugger::never_unload_debugger_ = false;
ager@chromium.org5ec48922009-05-05 07:25:34 +00001924v8::Debug::MessageHandler2 Debugger::message_handler_ = NULL;
kasperl@chromium.org71affb52009-05-26 05:44:31 +00001925bool Debugger::debugger_unload_pending_ = false;
ager@chromium.org65dad4b2009-04-23 08:48:43 +00001926v8::Debug::HostDispatchHandler Debugger::host_dispatch_handler_ = NULL;
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00001927Mutex* Debugger::dispatch_handler_access_ = OS::CreateMutex();
ager@chromium.orgc4c92722009-11-18 14:12:51 +00001928v8::Debug::DebugMessageDispatchHandler
1929 Debugger::debug_message_dispatch_handler_ = NULL;
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00001930MessageDispatchHelperThread* Debugger::message_dispatch_helper_thread_ = NULL;
ager@chromium.org65dad4b2009-04-23 08:48:43 +00001931int Debugger::host_dispatch_micros_ = 100 * 1000;
kasperl@chromium.org7be3c992009-03-12 07:19:55 +00001932DebuggerAgent* Debugger::agent_ = NULL;
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00001933LockingCommandMessageQueue Debugger::command_queue_(kQueueInitialSize);
ager@chromium.org41826e72009-03-30 13:30:57 +00001934Semaphore* Debugger::command_received_ = OS::CreateSemaphore(0);
mikhail.naganov@gmail.com22762872010-07-14 09:29:05 +00001935LockingCommandMessageQueue Debugger::event_command_queue_(kQueueInitialSize);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001936
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001937
1938Handle<Object> Debugger::MakeJSObject(Vector<const char> constructor_name,
1939 int argc, Object*** argv,
1940 bool* caught_exception) {
1941 ASSERT(Top::context() == *Debug::debug_context());
1942
1943 // Create the execution state object.
1944 Handle<String> constructor_str = Factory::LookupSymbol(constructor_name);
1945 Handle<Object> constructor(Top::global()->GetProperty(*constructor_str));
1946 ASSERT(constructor->IsJSFunction());
1947 if (!constructor->IsJSFunction()) {
1948 *caught_exception = true;
1949 return Factory::undefined_value();
1950 }
1951 Handle<Object> js_object = Execution::TryCall(
1952 Handle<JSFunction>::cast(constructor),
1953 Handle<JSObject>(Debug::debug_context()->global()), argc, argv,
1954 caught_exception);
1955 return js_object;
1956}
1957
1958
1959Handle<Object> Debugger::MakeExecutionState(bool* caught_exception) {
1960 // Create the execution state object.
kasperl@chromium.org7be3c992009-03-12 07:19:55 +00001961 Handle<Object> break_id = Factory::NewNumberFromInt(Debug::break_id());
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00001962 const int argc = 1;
1963 Object** argv[argc] = { break_id.location() };
1964 return MakeJSObject(CStrVector("MakeExecutionState"),
1965 argc, argv, caught_exception);
1966}
1967
1968
1969Handle<Object> Debugger::MakeBreakEvent(Handle<Object> exec_state,
1970 Handle<Object> break_points_hit,
1971 bool* caught_exception) {
1972 // Create the new break event object.
1973 const int argc = 2;
1974 Object** argv[argc] = { exec_state.location(),
1975 break_points_hit.location() };
1976 return MakeJSObject(CStrVector("MakeBreakEvent"),
1977 argc,
1978 argv,
1979 caught_exception);
1980}
1981
1982
1983Handle<Object> Debugger::MakeExceptionEvent(Handle<Object> exec_state,
1984 Handle<Object> exception,
1985 bool uncaught,
1986 bool* caught_exception) {
1987 // Create the new exception event object.
1988 const int argc = 3;
1989 Object** argv[argc] = { exec_state.location(),
1990 exception.location(),
1991 uncaught ? Factory::true_value().location() :
1992 Factory::false_value().location()};
1993 return MakeJSObject(CStrVector("MakeExceptionEvent"),
1994 argc, argv, caught_exception);
1995}
1996
1997
1998Handle<Object> Debugger::MakeNewFunctionEvent(Handle<Object> function,
1999 bool* caught_exception) {
2000 // Create the new function event object.
2001 const int argc = 1;
2002 Object** argv[argc] = { function.location() };
2003 return MakeJSObject(CStrVector("MakeNewFunctionEvent"),
2004 argc, argv, caught_exception);
2005}
2006
2007
2008Handle<Object> Debugger::MakeCompileEvent(Handle<Script> script,
iposva@chromium.org245aa852009-02-10 00:49:54 +00002009 bool before,
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002010 bool* caught_exception) {
2011 // Create the compile event object.
2012 Handle<Object> exec_state = MakeExecutionState(caught_exception);
iposva@chromium.org245aa852009-02-10 00:49:54 +00002013 Handle<Object> script_wrapper = GetScriptWrapper(script);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002014 const int argc = 3;
iposva@chromium.org245aa852009-02-10 00:49:54 +00002015 Object** argv[argc] = { exec_state.location(),
2016 script_wrapper.location(),
2017 before ? Factory::true_value().location() :
2018 Factory::false_value().location() };
2019
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002020 return MakeJSObject(CStrVector("MakeCompileEvent"),
2021 argc,
2022 argv,
2023 caught_exception);
2024}
2025
2026
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002027Handle<Object> Debugger::MakeScriptCollectedEvent(int id,
2028 bool* caught_exception) {
2029 // Create the script collected event object.
2030 Handle<Object> exec_state = MakeExecutionState(caught_exception);
2031 Handle<Object> id_object = Handle<Smi>(Smi::FromInt(id));
2032 const int argc = 2;
2033 Object** argv[argc] = { exec_state.location(), id_object.location() };
2034
2035 return MakeJSObject(CStrVector("MakeScriptCollectedEvent"),
2036 argc,
2037 argv,
2038 caught_exception);
2039}
2040
2041
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002042void Debugger::OnException(Handle<Object> exception, bool uncaught) {
2043 HandleScope scope;
2044
2045 // Bail out based on state or if there is no listener for this event
2046 if (Debug::InDebugger()) return;
2047 if (!Debugger::EventActive(v8::Exception)) return;
2048
2049 // Bail out if exception breaks are not active
2050 if (uncaught) {
2051 // Uncaught exceptions are reported by either flags.
2052 if (!(Debug::break_on_uncaught_exception() ||
2053 Debug::break_on_exception())) return;
2054 } else {
2055 // Caught exceptions are reported is activated.
2056 if (!Debug::break_on_exception()) return;
2057 }
2058
kasperl@chromium.org41044eb2008-10-06 08:24:46 +00002059 // Enter the debugger.
2060 EnterDebugger debugger;
2061 if (debugger.FailedToEnter()) return;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002062
2063 // Clear all current stepping setup.
2064 Debug::ClearStepping();
2065 // Create the event data object.
2066 bool caught_exception = false;
2067 Handle<Object> exec_state = MakeExecutionState(&caught_exception);
2068 Handle<Object> event_data;
2069 if (!caught_exception) {
2070 event_data = MakeExceptionEvent(exec_state, exception, uncaught,
2071 &caught_exception);
2072 }
2073 // Bail out and don't call debugger if exception.
2074 if (caught_exception) {
2075 return;
2076 }
2077
ager@chromium.org5ec48922009-05-05 07:25:34 +00002078 // Process debug event.
2079 ProcessDebugEvent(v8::Exception, Handle<JSObject>::cast(event_data), false);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002080 // Return to continue execution from where the exception was thrown.
2081}
2082
2083
ager@chromium.orgbb29dc92009-03-24 13:25:23 +00002084void Debugger::OnDebugBreak(Handle<Object> break_points_hit,
2085 bool auto_continue) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002086 HandleScope scope;
2087
kasper.lund212ac232008-07-16 07:07:30 +00002088 // Debugger has already been entered by caller.
2089 ASSERT(Top::context() == *Debug::debug_context());
2090
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002091 // Bail out if there is no listener for this event
2092 if (!Debugger::EventActive(v8::Break)) return;
2093
2094 // Debugger must be entered in advance.
2095 ASSERT(Top::context() == *Debug::debug_context());
2096
2097 // Create the event data object.
2098 bool caught_exception = false;
2099 Handle<Object> exec_state = MakeExecutionState(&caught_exception);
2100 Handle<Object> event_data;
2101 if (!caught_exception) {
2102 event_data = MakeBreakEvent(exec_state, break_points_hit,
2103 &caught_exception);
2104 }
2105 // Bail out and don't call debugger if exception.
2106 if (caught_exception) {
2107 return;
2108 }
2109
ager@chromium.org5ec48922009-05-05 07:25:34 +00002110 // Process debug event.
2111 ProcessDebugEvent(v8::Break,
2112 Handle<JSObject>::cast(event_data),
2113 auto_continue);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002114}
2115
2116
2117void Debugger::OnBeforeCompile(Handle<Script> script) {
2118 HandleScope scope;
2119
2120 // Bail out based on state or if there is no listener for this event
2121 if (Debug::InDebugger()) return;
2122 if (compiling_natives()) return;
2123 if (!EventActive(v8::BeforeCompile)) return;
2124
kasperl@chromium.org41044eb2008-10-06 08:24:46 +00002125 // Enter the debugger.
2126 EnterDebugger debugger;
2127 if (debugger.FailedToEnter()) return;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002128
2129 // Create the event data object.
2130 bool caught_exception = false;
iposva@chromium.org245aa852009-02-10 00:49:54 +00002131 Handle<Object> event_data = MakeCompileEvent(script, true, &caught_exception);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002132 // Bail out and don't call debugger if exception.
2133 if (caught_exception) {
2134 return;
2135 }
2136
ager@chromium.org5ec48922009-05-05 07:25:34 +00002137 // Process debug event.
2138 ProcessDebugEvent(v8::BeforeCompile,
2139 Handle<JSObject>::cast(event_data),
2140 true);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002141}
2142
2143
2144// Handle debugger actions when a new script is compiled.
ager@chromium.orgce5e87b2010-03-10 10:24:18 +00002145void Debugger::OnAfterCompile(Handle<Script> script,
2146 AfterCompileFlags after_compile_flags) {
kasper.lund212ac232008-07-16 07:07:30 +00002147 HandleScope scope;
2148
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002149 // Add the newly compiled script to the script cache.
2150 Debug::AddScriptToScriptCache(script);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002151
2152 // No more to do if not debugging.
ager@chromium.org71daaf62009-04-01 07:22:49 +00002153 if (!IsDebuggerActive()) return;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002154
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002155 // No compile events while compiling natives.
2156 if (compiling_natives()) return;
2157
iposva@chromium.org245aa852009-02-10 00:49:54 +00002158 // Store whether in debugger before entering debugger.
2159 bool in_debugger = Debug::InDebugger();
2160
kasperl@chromium.org41044eb2008-10-06 08:24:46 +00002161 // Enter the debugger.
2162 EnterDebugger debugger;
2163 if (debugger.FailedToEnter()) return;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002164
2165 // If debugging there might be script break points registered for this
2166 // script. Make sure that these break points are set.
2167
kmillikin@chromium.org5d8f0e62010-03-24 08:21:20 +00002168 // Get the function UpdateScriptBreakPoints (defined in debug-debugger.js).
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002169 Handle<Object> update_script_break_points =
2170 Handle<Object>(Debug::debug_context()->global()->GetProperty(
2171 *Factory::LookupAsciiSymbol("UpdateScriptBreakPoints")));
2172 if (!update_script_break_points->IsJSFunction()) {
2173 return;
2174 }
2175 ASSERT(update_script_break_points->IsJSFunction());
2176
2177 // Wrap the script object in a proper JS object before passing it
2178 // to JavaScript.
2179 Handle<JSValue> wrapper = GetScriptWrapper(script);
2180
2181 // Call UpdateScriptBreakPoints expect no exceptions.
kasper.lund212ac232008-07-16 07:07:30 +00002182 bool caught_exception = false;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002183 const int argc = 1;
2184 Object** argv[argc] = { reinterpret_cast<Object**>(wrapper.location()) };
2185 Handle<Object> result = Execution::TryCall(
2186 Handle<JSFunction>::cast(update_script_break_points),
2187 Top::builtins(), argc, argv,
2188 &caught_exception);
2189 if (caught_exception) {
2190 return;
2191 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002192 // Bail out based on state or if there is no listener for this event
ager@chromium.orgce5e87b2010-03-10 10:24:18 +00002193 if (in_debugger && (after_compile_flags & SEND_WHEN_DEBUGGING) == 0) return;
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002194 if (!Debugger::EventActive(v8::AfterCompile)) return;
2195
2196 // Create the compile state object.
2197 Handle<Object> event_data = MakeCompileEvent(script,
iposva@chromium.org245aa852009-02-10 00:49:54 +00002198 false,
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002199 &caught_exception);
2200 // Bail out and don't call debugger if exception.
2201 if (caught_exception) {
2202 return;
2203 }
ager@chromium.org5ec48922009-05-05 07:25:34 +00002204 // Process debug event.
2205 ProcessDebugEvent(v8::AfterCompile,
2206 Handle<JSObject>::cast(event_data),
2207 true);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002208}
2209
2210
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002211void Debugger::OnScriptCollected(int id) {
2212 HandleScope scope;
2213
2214 // No more to do if not debugging.
2215 if (!IsDebuggerActive()) return;
2216 if (!Debugger::EventActive(v8::ScriptCollected)) return;
2217
2218 // Enter the debugger.
2219 EnterDebugger debugger;
2220 if (debugger.FailedToEnter()) return;
2221
2222 // Create the script collected state object.
2223 bool caught_exception = false;
2224 Handle<Object> event_data = MakeScriptCollectedEvent(id,
2225 &caught_exception);
2226 // Bail out and don't call debugger if exception.
2227 if (caught_exception) {
2228 return;
2229 }
2230
2231 // Process debug event.
2232 ProcessDebugEvent(v8::ScriptCollected,
2233 Handle<JSObject>::cast(event_data),
2234 true);
2235}
2236
2237
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002238void Debugger::ProcessDebugEvent(v8::DebugEvent event,
ager@chromium.org5ec48922009-05-05 07:25:34 +00002239 Handle<JSObject> event_data,
ager@chromium.orgbb29dc92009-03-24 13:25:23 +00002240 bool auto_continue) {
ager@chromium.org381abbb2009-02-25 13:23:22 +00002241 HandleScope scope;
2242
sgjesse@chromium.org755c5b12009-05-29 11:04:38 +00002243 // Clear any pending debug break if this is a real break.
2244 if (!auto_continue) {
2245 Debug::clear_interrupt_pending(DEBUGBREAK);
2246 }
2247
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002248 // Create the execution state.
2249 bool caught_exception = false;
2250 Handle<Object> exec_state = MakeExecutionState(&caught_exception);
2251 if (caught_exception) {
2252 return;
2253 }
ager@chromium.org41826e72009-03-30 13:30:57 +00002254 // First notify the message handler if any.
2255 if (message_handler_ != NULL) {
ager@chromium.org5ec48922009-05-05 07:25:34 +00002256 NotifyMessageHandler(event,
2257 Handle<JSObject>::cast(exec_state),
2258 event_data,
2259 auto_continue);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002260 }
mikhail.naganov@gmail.com22762872010-07-14 09:29:05 +00002261 // Notify registered debug event listener. This can be either a C or
2262 // a JavaScript function. Don't call event listener for v8::Break
2263 // here, if it's only a debug command -- they will be processed later.
2264 if ((event != v8::Break || !auto_continue) && !event_listener_.is_null()) {
2265 CallEventCallback(event, exec_state, event_data, NULL);
2266 }
2267 // Process pending debug commands.
2268 if (event == v8::Break) {
2269 while (!event_command_queue_.IsEmpty()) {
2270 CommandMessage command = event_command_queue_.Get();
2271 if (!event_listener_.is_null()) {
2272 CallEventCallback(v8::BreakForCommand,
2273 exec_state,
2274 event_data,
2275 command.client_data());
2276 }
2277 command.Dispose();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002278 }
2279 }
2280}
2281
2282
mikhail.naganov@gmail.com22762872010-07-14 09:29:05 +00002283void Debugger::CallEventCallback(v8::DebugEvent event,
2284 Handle<Object> exec_state,
2285 Handle<Object> event_data,
2286 v8::Debug::ClientData* client_data) {
2287 if (event_listener_->IsProxy()) {
2288 CallCEventCallback(event, exec_state, event_data, client_data);
2289 } else {
2290 CallJSEventCallback(event, exec_state, event_data);
2291 }
2292}
2293
2294
2295void Debugger::CallCEventCallback(v8::DebugEvent event,
2296 Handle<Object> exec_state,
2297 Handle<Object> event_data,
2298 v8::Debug::ClientData* client_data) {
2299 Handle<Proxy> callback_obj(Handle<Proxy>::cast(event_listener_));
2300 v8::Debug::EventCallback2 callback =
2301 FUNCTION_CAST<v8::Debug::EventCallback2>(callback_obj->proxy());
2302 EventDetailsImpl event_details(
2303 event,
2304 Handle<JSObject>::cast(exec_state),
2305 Handle<JSObject>::cast(event_data),
2306 event_listener_data_,
2307 client_data);
2308 callback(event_details);
2309}
2310
2311
2312void Debugger::CallJSEventCallback(v8::DebugEvent event,
2313 Handle<Object> exec_state,
2314 Handle<Object> event_data) {
2315 ASSERT(event_listener_->IsJSFunction());
2316 Handle<JSFunction> fun(Handle<JSFunction>::cast(event_listener_));
2317
2318 // Invoke the JavaScript debug event listener.
2319 const int argc = 4;
2320 Object** argv[argc] = { Handle<Object>(Smi::FromInt(event)).location(),
2321 exec_state.location(),
2322 Handle<Object>::cast(event_data).location(),
2323 event_listener_data_.location() };
2324 bool caught_exception = false;
2325 Execution::TryCall(fun, Top::global(), argc, argv, &caught_exception);
2326 // Silently ignore exceptions from debug event listeners.
2327}
2328
2329
lrn@chromium.orgc34f5802010-04-28 12:53:43 +00002330Handle<Context> Debugger::GetDebugContext() {
2331 never_unload_debugger_ = true;
2332 EnterDebugger debugger;
2333 return Debug::debug_context();
2334}
2335
2336
ager@chromium.org71daaf62009-04-01 07:22:49 +00002337void Debugger::UnloadDebugger() {
2338 // Make sure that there are no breakpoints left.
2339 Debug::ClearAllBreakPoints();
2340
2341 // Unload the debugger if feasible.
2342 if (!never_unload_debugger_) {
2343 Debug::Unload();
2344 }
2345
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002346 // Clear the flag indicating that the debugger should be unloaded.
2347 debugger_unload_pending_ = false;
ager@chromium.org71daaf62009-04-01 07:22:49 +00002348}
2349
2350
ager@chromium.org41826e72009-03-30 13:30:57 +00002351void Debugger::NotifyMessageHandler(v8::DebugEvent event,
ager@chromium.org5ec48922009-05-05 07:25:34 +00002352 Handle<JSObject> exec_state,
2353 Handle<JSObject> event_data,
ager@chromium.org41826e72009-03-30 13:30:57 +00002354 bool auto_continue) {
2355 HandleScope scope;
2356
2357 if (!Debug::Load()) return;
2358
2359 // Process the individual events.
ager@chromium.org5ec48922009-05-05 07:25:34 +00002360 bool sendEventMessage = false;
ager@chromium.org41826e72009-03-30 13:30:57 +00002361 switch (event) {
2362 case v8::Break:
mikhail.naganov@gmail.com22762872010-07-14 09:29:05 +00002363 case v8::BreakForCommand:
ager@chromium.org5ec48922009-05-05 07:25:34 +00002364 sendEventMessage = !auto_continue;
ager@chromium.org41826e72009-03-30 13:30:57 +00002365 break;
2366 case v8::Exception:
ager@chromium.org5ec48922009-05-05 07:25:34 +00002367 sendEventMessage = true;
ager@chromium.org41826e72009-03-30 13:30:57 +00002368 break;
2369 case v8::BeforeCompile:
2370 break;
2371 case v8::AfterCompile:
ager@chromium.org5ec48922009-05-05 07:25:34 +00002372 sendEventMessage = true;
ager@chromium.org41826e72009-03-30 13:30:57 +00002373 break;
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002374 case v8::ScriptCollected:
2375 sendEventMessage = true;
2376 break;
ager@chromium.org41826e72009-03-30 13:30:57 +00002377 case v8::NewFunction:
2378 break;
2379 default:
2380 UNREACHABLE();
2381 }
2382
ager@chromium.org5ec48922009-05-05 07:25:34 +00002383 // The debug command interrupt flag might have been set when the command was
2384 // added. It should be enough to clear the flag only once while we are in the
2385 // debugger.
2386 ASSERT(Debug::InDebugger());
2387 StackGuard::Continue(DEBUGCOMMAND);
2388
2389 // Notify the debugger that a debug event has occurred unless auto continue is
2390 // active in which case no event is send.
2391 if (sendEventMessage) {
2392 MessageImpl message = MessageImpl::NewEvent(
2393 event,
2394 auto_continue,
2395 Handle<JSObject>::cast(exec_state),
2396 Handle<JSObject>::cast(event_data));
2397 InvokeMessageHandler(message);
2398 }
sgjesse@chromium.org755c5b12009-05-29 11:04:38 +00002399
2400 // If auto continue don't make the event cause a break, but process messages
2401 // in the queue if any. For script collected events don't even process
2402 // messages in the queue as the execution state might not be what is expected
2403 // by the client.
ager@chromium.org6ffc2172009-05-29 19:20:16 +00002404 if ((auto_continue && !HasCommands()) || event == v8::ScriptCollected) {
ager@chromium.org5ec48922009-05-05 07:25:34 +00002405 return;
2406 }
ager@chromium.org41826e72009-03-30 13:30:57 +00002407
ager@chromium.org41826e72009-03-30 13:30:57 +00002408 v8::TryCatch try_catch;
christian.plesner.hansen@gmail.com9d58c2b2009-10-16 11:48:38 +00002409
2410 // DebugCommandProcessor goes here.
2411 v8::Local<v8::Object> cmd_processor;
2412 {
2413 v8::Local<v8::Object> api_exec_state =
2414 v8::Utils::ToLocal(Handle<JSObject>::cast(exec_state));
2415 v8::Local<v8::String> fun_name =
2416 v8::String::New("debugCommandProcessor");
2417 v8::Local<v8::Function> fun =
2418 v8::Function::Cast(*api_exec_state->Get(fun_name));
2419
2420 v8::Handle<v8::Boolean> running =
2421 auto_continue ? v8::True() : v8::False();
2422 static const int kArgc = 1;
2423 v8::Handle<Value> argv[kArgc] = { running };
2424 cmd_processor = v8::Object::Cast(*fun->Call(api_exec_state, kArgc, argv));
2425 if (try_catch.HasCaught()) {
2426 PrintLn(try_catch.Exception());
2427 return;
2428 }
ager@chromium.org41826e72009-03-30 13:30:57 +00002429 }
2430
christian.plesner.hansen@gmail.com9d58c2b2009-10-16 11:48:38 +00002431 bool running = auto_continue;
2432
ager@chromium.org41826e72009-03-30 13:30:57 +00002433 // Process requests from the debugger.
2434 while (true) {
2435 // Wait for new command in the queue.
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002436 if (Debugger::host_dispatch_handler_) {
2437 // In case there is a host dispatch - do periodic dispatches.
2438 if (!command_received_->Wait(host_dispatch_micros_)) {
2439 // Timout expired, do the dispatch.
2440 Debugger::host_dispatch_handler_();
2441 continue;
2442 }
2443 } else {
2444 // In case there is no host dispatch - just wait.
2445 command_received_->Wait();
2446 }
ager@chromium.org41826e72009-03-30 13:30:57 +00002447
ager@chromium.org41826e72009-03-30 13:30:57 +00002448 // Get the command from the queue.
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002449 CommandMessage command = command_queue_.Get();
ager@chromium.org41826e72009-03-30 13:30:57 +00002450 Logger::DebugTag("Got request from command queue, in interactive loop.");
ager@chromium.org71daaf62009-04-01 07:22:49 +00002451 if (!Debugger::IsDebuggerActive()) {
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002452 // Delete command text and user data.
2453 command.Dispose();
ager@chromium.org41826e72009-03-30 13:30:57 +00002454 return;
2455 }
2456
ager@chromium.org41826e72009-03-30 13:30:57 +00002457 // Invoke JavaScript to process the debug request.
2458 v8::Local<v8::String> fun_name;
2459 v8::Local<v8::Function> fun;
2460 v8::Local<v8::Value> request;
2461 v8::TryCatch try_catch;
2462 fun_name = v8::String::New("processDebugRequest");
2463 fun = v8::Function::Cast(*cmd_processor->Get(fun_name));
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002464
2465 request = v8::String::New(command.text().start(),
2466 command.text().length());
ager@chromium.org41826e72009-03-30 13:30:57 +00002467 static const int kArgc = 1;
2468 v8::Handle<Value> argv[kArgc] = { request };
2469 v8::Local<v8::Value> response_val = fun->Call(cmd_processor, kArgc, argv);
2470
2471 // Get the response.
2472 v8::Local<v8::String> response;
ager@chromium.org41826e72009-03-30 13:30:57 +00002473 if (!try_catch.HasCaught()) {
2474 // Get response string.
2475 if (!response_val->IsUndefined()) {
2476 response = v8::String::Cast(*response_val);
2477 } else {
2478 response = v8::String::New("");
2479 }
2480
2481 // Log the JSON request/response.
2482 if (FLAG_trace_debug_json) {
2483 PrintLn(request);
2484 PrintLn(response);
2485 }
2486
2487 // Get the running state.
2488 fun_name = v8::String::New("isRunning");
2489 fun = v8::Function::Cast(*cmd_processor->Get(fun_name));
2490 static const int kArgc = 1;
2491 v8::Handle<Value> argv[kArgc] = { response };
2492 v8::Local<v8::Value> running_val = fun->Call(cmd_processor, kArgc, argv);
2493 if (!try_catch.HasCaught()) {
2494 running = running_val->ToBoolean()->Value();
2495 }
2496 } else {
2497 // In case of failure the result text is the exception text.
2498 response = try_catch.Exception()->ToString();
2499 }
2500
ager@chromium.org41826e72009-03-30 13:30:57 +00002501 // Return the result.
ager@chromium.org5ec48922009-05-05 07:25:34 +00002502 MessageImpl message = MessageImpl::NewResponse(
2503 event,
2504 running,
2505 Handle<JSObject>::cast(exec_state),
2506 Handle<JSObject>::cast(event_data),
2507 Handle<String>(Utils::OpenHandle(*response)),
2508 command.client_data());
2509 InvokeMessageHandler(message);
2510 command.Dispose();
ager@chromium.org41826e72009-03-30 13:30:57 +00002511
2512 // Return from debug event processing if either the VM is put into the
2513 // runnning state (through a continue command) or auto continue is active
2514 // and there are no more commands queued.
christian.plesner.hansen@gmail.com9d58c2b2009-10-16 11:48:38 +00002515 if (running && !HasCommands()) {
ager@chromium.org41826e72009-03-30 13:30:57 +00002516 return;
2517 }
2518 }
2519}
2520
2521
iposva@chromium.org245aa852009-02-10 00:49:54 +00002522void Debugger::SetEventListener(Handle<Object> callback,
2523 Handle<Object> data) {
2524 HandleScope scope;
2525
2526 // Clear the global handles for the event listener and the event listener data
2527 // object.
2528 if (!event_listener_.is_null()) {
2529 GlobalHandles::Destroy(
2530 reinterpret_cast<Object**>(event_listener_.location()));
2531 event_listener_ = Handle<Object>();
2532 }
2533 if (!event_listener_data_.is_null()) {
2534 GlobalHandles::Destroy(
2535 reinterpret_cast<Object**>(event_listener_data_.location()));
2536 event_listener_data_ = Handle<Object>();
2537 }
2538
2539 // If there is a new debug event listener register it together with its data
2540 // object.
2541 if (!callback->IsUndefined() && !callback->IsNull()) {
2542 event_listener_ = Handle<Object>::cast(GlobalHandles::Create(*callback));
2543 if (data.is_null()) {
2544 data = Factory::undefined_value();
2545 }
2546 event_listener_data_ = Handle<Object>::cast(GlobalHandles::Create(*data));
2547 }
2548
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002549 ListenersChanged();
iposva@chromium.org245aa852009-02-10 00:49:54 +00002550}
2551
2552
ager@chromium.org5ec48922009-05-05 07:25:34 +00002553void Debugger::SetMessageHandler(v8::Debug::MessageHandler2 handler) {
ager@chromium.org71daaf62009-04-01 07:22:49 +00002554 ScopedLock with(debugger_access_);
2555
ager@chromium.org381abbb2009-02-25 13:23:22 +00002556 message_handler_ = handler;
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002557 ListenersChanged();
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002558 if (handler == NULL) {
ager@chromium.org71daaf62009-04-01 07:22:49 +00002559 // Send an empty command to the debugger if in a break to make JavaScript
2560 // run again if the debugger is closed.
2561 if (Debug::InDebugger()) {
2562 ProcessCommand(Vector<const uint16_t>::empty());
2563 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002564 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002565}
2566
2567
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002568void Debugger::ListenersChanged() {
2569 if (IsDebuggerActive()) {
2570 // Disable the compilation cache when the debugger is active.
2571 CompilationCache::Disable();
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00002572 debugger_unload_pending_ = false;
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002573 } else {
2574 CompilationCache::Enable();
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002575 // Unload the debugger if event listener and message handler cleared.
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00002576 // Schedule this for later, because we may be in non-V8 thread.
2577 debugger_unload_pending_ = true;
kasperl@chromium.org71affb52009-05-26 05:44:31 +00002578 }
2579}
2580
2581
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002582void Debugger::SetHostDispatchHandler(v8::Debug::HostDispatchHandler handler,
2583 int period) {
ager@chromium.org381abbb2009-02-25 13:23:22 +00002584 host_dispatch_handler_ = handler;
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002585 host_dispatch_micros_ = period * 1000;
ager@chromium.org381abbb2009-02-25 13:23:22 +00002586}
2587
2588
ager@chromium.orgc4c92722009-11-18 14:12:51 +00002589void Debugger::SetDebugMessageDispatchHandler(
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00002590 v8::Debug::DebugMessageDispatchHandler handler, bool provide_locker) {
2591 ScopedLock with(dispatch_handler_access_);
ager@chromium.orgc4c92722009-11-18 14:12:51 +00002592 debug_message_dispatch_handler_ = handler;
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00002593
2594 if (provide_locker && message_dispatch_helper_thread_ == NULL) {
2595 message_dispatch_helper_thread_ = new MessageDispatchHelperThread;
2596 message_dispatch_helper_thread_->Start();
2597 }
ager@chromium.orgc4c92722009-11-18 14:12:51 +00002598}
2599
2600
ager@chromium.org41826e72009-03-30 13:30:57 +00002601// Calls the registered debug message handler. This callback is part of the
ager@chromium.org5ec48922009-05-05 07:25:34 +00002602// public API.
2603void Debugger::InvokeMessageHandler(MessageImpl message) {
ager@chromium.org71daaf62009-04-01 07:22:49 +00002604 ScopedLock with(debugger_access_);
2605
ager@chromium.org381abbb2009-02-25 13:23:22 +00002606 if (message_handler_ != NULL) {
ager@chromium.org5ec48922009-05-05 07:25:34 +00002607 message_handler_(message);
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002608 }
ager@chromium.org41826e72009-03-30 13:30:57 +00002609}
2610
2611
2612// Puts a command coming from the public API on the queue. Creates
2613// a copy of the command string managed by the debugger. Up to this
2614// point, the command data was managed by the API client. Called
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002615// by the API client thread.
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002616void Debugger::ProcessCommand(Vector<const uint16_t> command,
2617 v8::Debug::ClientData* client_data) {
2618 // Need to cast away const.
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002619 CommandMessage message = CommandMessage::New(
ager@chromium.org41826e72009-03-30 13:30:57 +00002620 Vector<uint16_t>(const_cast<uint16_t*>(command.start()),
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002621 command.length()),
2622 client_data);
ager@chromium.org41826e72009-03-30 13:30:57 +00002623 Logger::DebugTag("Put command on command_queue.");
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002624 command_queue_.Put(message);
ager@chromium.org41826e72009-03-30 13:30:57 +00002625 command_received_->Signal();
sgjesse@chromium.org3afc1582009-04-16 22:31:44 +00002626
2627 // Set the debug command break flag to have the command processed.
ager@chromium.org41826e72009-03-30 13:30:57 +00002628 if (!Debug::InDebugger()) {
2629 StackGuard::DebugCommand();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002630 }
ager@chromium.orgc4c92722009-11-18 14:12:51 +00002631
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00002632 MessageDispatchHelperThread* dispatch_thread;
2633 {
2634 ScopedLock with(dispatch_handler_access_);
2635 dispatch_thread = message_dispatch_helper_thread_;
2636 }
2637
2638 if (dispatch_thread == NULL) {
2639 CallMessageDispatchHandler();
2640 } else {
2641 dispatch_thread->Schedule();
ager@chromium.orgc4c92722009-11-18 14:12:51 +00002642 }
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002643}
2644
2645
ager@chromium.orgbb29dc92009-03-24 13:25:23 +00002646bool Debugger::HasCommands() {
ager@chromium.org41826e72009-03-30 13:30:57 +00002647 return !command_queue_.IsEmpty();
ager@chromium.orgbb29dc92009-03-24 13:25:23 +00002648}
2649
2650
mikhail.naganov@gmail.com22762872010-07-14 09:29:05 +00002651void Debugger::EnqueueDebugCommand(v8::Debug::ClientData* client_data) {
2652 CommandMessage message = CommandMessage::New(Vector<uint16_t>(), client_data);
2653 event_command_queue_.Put(message);
2654
2655 // Set the debug command break flag to have the command processed.
2656 if (!Debug::InDebugger()) {
2657 StackGuard::DebugCommand();
2658 }
2659}
2660
2661
ager@chromium.org71daaf62009-04-01 07:22:49 +00002662bool Debugger::IsDebuggerActive() {
2663 ScopedLock with(debugger_access_);
2664
2665 return message_handler_ != NULL || !event_listener_.is_null();
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002666}
2667
2668
ager@chromium.orga74f0da2008-12-03 16:05:52 +00002669Handle<Object> Debugger::Call(Handle<JSFunction> fun,
2670 Handle<Object> data,
2671 bool* pending_exception) {
ager@chromium.org71daaf62009-04-01 07:22:49 +00002672 // When calling functions in the debugger prevent it from beeing unloaded.
2673 Debugger::never_unload_debugger_ = true;
2674
ager@chromium.orga74f0da2008-12-03 16:05:52 +00002675 // Enter the debugger.
2676 EnterDebugger debugger;
sgjesse@chromium.orgdf7a2842010-03-25 14:34:15 +00002677 if (debugger.FailedToEnter()) {
ager@chromium.orga74f0da2008-12-03 16:05:52 +00002678 return Factory::undefined_value();
2679 }
2680
2681 // Create the execution state.
2682 bool caught_exception = false;
2683 Handle<Object> exec_state = MakeExecutionState(&caught_exception);
2684 if (caught_exception) {
2685 return Factory::undefined_value();
2686 }
2687
2688 static const int kArgc = 2;
2689 Object** argv[kArgc] = { exec_state.location(), data.location() };
sgjesse@chromium.orgdf7a2842010-03-25 14:34:15 +00002690 Handle<Object> result = Execution::Call(
2691 fun,
2692 Handle<Object>(Debug::debug_context_->global_proxy()),
2693 kArgc,
2694 argv,
2695 pending_exception);
ager@chromium.orga74f0da2008-12-03 16:05:52 +00002696 return result;
2697}
2698
2699
fschneider@chromium.org0c20e672010-01-14 15:28:53 +00002700static void StubMessageHandler2(const v8::Debug::Message& message) {
2701 // Simply ignore message.
2702}
2703
2704
2705bool Debugger::StartAgent(const char* name, int port,
2706 bool wait_for_connection) {
2707 if (wait_for_connection) {
2708 // Suspend V8 if it is already running or set V8 to suspend whenever
2709 // it starts.
2710 // Provide stub message handler; V8 auto-continues each suspend
2711 // when there is no message handler; we doesn't need it.
2712 // Once become suspended, V8 will stay so indefinitely long, until remote
2713 // debugger connects and issues "continue" command.
2714 Debugger::message_handler_ = StubMessageHandler2;
2715 v8::Debug::DebugBreak();
2716 }
2717
kasperl@chromium.org7be3c992009-03-12 07:19:55 +00002718 if (Socket::Setup()) {
ager@chromium.orgbb29dc92009-03-24 13:25:23 +00002719 agent_ = new DebuggerAgent(name, port);
kasperl@chromium.org7be3c992009-03-12 07:19:55 +00002720 agent_->Start();
2721 return true;
2722 }
2723
2724 return false;
2725}
2726
2727
ager@chromium.orgbb29dc92009-03-24 13:25:23 +00002728void Debugger::StopAgent() {
2729 if (agent_ != NULL) {
2730 agent_->Shutdown();
2731 agent_->Join();
2732 delete agent_;
2733 agent_ = NULL;
2734 }
2735}
2736
2737
sgjesse@chromium.orgc5145742009-10-07 09:00:33 +00002738void Debugger::WaitForAgent() {
2739 if (agent_ != NULL)
2740 agent_->WaitUntilListening();
2741}
2742
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00002743
2744void Debugger::CallMessageDispatchHandler() {
2745 v8::Debug::DebugMessageDispatchHandler handler;
2746 {
2747 ScopedLock with(dispatch_handler_access_);
2748 handler = Debugger::debug_message_dispatch_handler_;
2749 }
2750 if (handler != NULL) {
2751 handler();
2752 }
2753}
2754
2755
ager@chromium.org5ec48922009-05-05 07:25:34 +00002756MessageImpl MessageImpl::NewEvent(DebugEvent event,
2757 bool running,
2758 Handle<JSObject> exec_state,
2759 Handle<JSObject> event_data) {
2760 MessageImpl message(true, event, running,
2761 exec_state, event_data, Handle<String>(), NULL);
2762 return message;
2763}
2764
2765
2766MessageImpl MessageImpl::NewResponse(DebugEvent event,
2767 bool running,
2768 Handle<JSObject> exec_state,
2769 Handle<JSObject> event_data,
2770 Handle<String> response_json,
2771 v8::Debug::ClientData* client_data) {
2772 MessageImpl message(false, event, running,
2773 exec_state, event_data, response_json, client_data);
2774 return message;
2775}
2776
2777
2778MessageImpl::MessageImpl(bool is_event,
2779 DebugEvent event,
2780 bool running,
2781 Handle<JSObject> exec_state,
2782 Handle<JSObject> event_data,
2783 Handle<String> response_json,
2784 v8::Debug::ClientData* client_data)
2785 : is_event_(is_event),
2786 event_(event),
2787 running_(running),
2788 exec_state_(exec_state),
2789 event_data_(event_data),
2790 response_json_(response_json),
2791 client_data_(client_data) {}
2792
2793
2794bool MessageImpl::IsEvent() const {
2795 return is_event_;
2796}
2797
2798
2799bool MessageImpl::IsResponse() const {
2800 return !is_event_;
2801}
2802
2803
2804DebugEvent MessageImpl::GetEvent() const {
2805 return event_;
2806}
2807
2808
2809bool MessageImpl::WillStartRunning() const {
2810 return running_;
2811}
2812
2813
2814v8::Handle<v8::Object> MessageImpl::GetExecutionState() const {
2815 return v8::Utils::ToLocal(exec_state_);
2816}
2817
2818
2819v8::Handle<v8::Object> MessageImpl::GetEventData() const {
2820 return v8::Utils::ToLocal(event_data_);
2821}
2822
2823
2824v8::Handle<v8::String> MessageImpl::GetJSON() const {
2825 v8::HandleScope scope;
2826
2827 if (IsEvent()) {
2828 // Call toJSONProtocol on the debug event object.
2829 Handle<Object> fun = GetProperty(event_data_, "toJSONProtocol");
2830 if (!fun->IsJSFunction()) {
2831 return v8::Handle<v8::String>();
2832 }
2833 bool caught_exception;
2834 Handle<Object> json = Execution::TryCall(Handle<JSFunction>::cast(fun),
2835 event_data_,
2836 0, NULL, &caught_exception);
2837 if (caught_exception || !json->IsString()) {
2838 return v8::Handle<v8::String>();
2839 }
2840 return scope.Close(v8::Utils::ToLocal(Handle<String>::cast(json)));
2841 } else {
2842 return v8::Utils::ToLocal(response_json_);
2843 }
2844}
2845
2846
2847v8::Handle<v8::Context> MessageImpl::GetEventContext() const {
erik.corry@gmail.com9dfbea42010-05-21 12:58:28 +00002848 v8::Handle<v8::Context> context = GetDebugEventContext();
2849 // Top::context() may be NULL when "script collected" event occures.
2850 ASSERT(!context.IsEmpty() || event_ == v8::ScriptCollected);
2851 return GetDebugEventContext();
ager@chromium.org5ec48922009-05-05 07:25:34 +00002852}
2853
2854
2855v8::Debug::ClientData* MessageImpl::GetClientData() const {
2856 return client_data_;
2857}
2858
2859
erik.corry@gmail.com9dfbea42010-05-21 12:58:28 +00002860EventDetailsImpl::EventDetailsImpl(DebugEvent event,
2861 Handle<JSObject> exec_state,
2862 Handle<JSObject> event_data,
mikhail.naganov@gmail.com22762872010-07-14 09:29:05 +00002863 Handle<Object> callback_data,
2864 v8::Debug::ClientData* client_data)
erik.corry@gmail.com9dfbea42010-05-21 12:58:28 +00002865 : event_(event),
2866 exec_state_(exec_state),
2867 event_data_(event_data),
mikhail.naganov@gmail.com22762872010-07-14 09:29:05 +00002868 callback_data_(callback_data),
2869 client_data_(client_data) {}
erik.corry@gmail.com9dfbea42010-05-21 12:58:28 +00002870
2871
2872DebugEvent EventDetailsImpl::GetEvent() const {
2873 return event_;
2874}
2875
2876
2877v8::Handle<v8::Object> EventDetailsImpl::GetExecutionState() const {
2878 return v8::Utils::ToLocal(exec_state_);
2879}
2880
2881
2882v8::Handle<v8::Object> EventDetailsImpl::GetEventData() const {
2883 return v8::Utils::ToLocal(event_data_);
2884}
2885
2886
2887v8::Handle<v8::Context> EventDetailsImpl::GetEventContext() const {
2888 return GetDebugEventContext();
2889}
2890
2891
2892v8::Handle<v8::Value> EventDetailsImpl::GetCallbackData() const {
2893 return v8::Utils::ToLocal(callback_data_);
2894}
2895
2896
mikhail.naganov@gmail.com22762872010-07-14 09:29:05 +00002897v8::Debug::ClientData* EventDetailsImpl::GetClientData() const {
2898 return client_data_;
2899}
2900
2901
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002902CommandMessage::CommandMessage() : text_(Vector<uint16_t>::empty()),
2903 client_data_(NULL) {
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00002904}
2905
2906
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002907CommandMessage::CommandMessage(const Vector<uint16_t>& text,
2908 v8::Debug::ClientData* data)
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002909 : text_(text),
2910 client_data_(data) {
2911}
2912
2913
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002914CommandMessage::~CommandMessage() {
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002915}
2916
2917
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002918void CommandMessage::Dispose() {
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002919 text_.Dispose();
2920 delete client_data_;
2921 client_data_ = NULL;
2922}
2923
2924
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002925CommandMessage CommandMessage::New(const Vector<uint16_t>& command,
2926 v8::Debug::ClientData* data) {
2927 return CommandMessage(command.Clone(), data);
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002928}
2929
2930
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002931CommandMessageQueue::CommandMessageQueue(int size) : start_(0), end_(0),
2932 size_(size) {
2933 messages_ = NewArray<CommandMessage>(size);
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002934}
2935
2936
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002937CommandMessageQueue::~CommandMessageQueue() {
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002938 while (!IsEmpty()) {
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002939 CommandMessage m = Get();
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002940 m.Dispose();
2941 }
kasper.lund7276f142008-07-30 08:49:36 +00002942 DeleteArray(messages_);
2943}
2944
2945
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002946CommandMessage CommandMessageQueue::Get() {
kasper.lund7276f142008-07-30 08:49:36 +00002947 ASSERT(!IsEmpty());
2948 int result = start_;
2949 start_ = (start_ + 1) % size_;
2950 return messages_[result];
2951}
2952
2953
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002954void CommandMessageQueue::Put(const CommandMessage& message) {
kasper.lund7276f142008-07-30 08:49:36 +00002955 if ((end_ + 1) % size_ == start_) {
2956 Expand();
2957 }
2958 messages_[end_] = message;
2959 end_ = (end_ + 1) % size_;
2960}
2961
2962
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002963void CommandMessageQueue::Expand() {
2964 CommandMessageQueue new_queue(size_ * 2);
kasper.lund7276f142008-07-30 08:49:36 +00002965 while (!IsEmpty()) {
2966 new_queue.Put(Get());
2967 }
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002968 CommandMessage* array_to_free = messages_;
kasper.lund7276f142008-07-30 08:49:36 +00002969 *this = new_queue;
2970 new_queue.messages_ = array_to_free;
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002971 // Make the new_queue empty so that it doesn't call Dispose on any messages.
2972 new_queue.start_ = new_queue.end_;
kasper.lund7276f142008-07-30 08:49:36 +00002973 // Automatic destructor called on new_queue, freeing array_to_free.
2974}
2975
2976
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002977LockingCommandMessageQueue::LockingCommandMessageQueue(int size)
2978 : queue_(size) {
kasper.lund7276f142008-07-30 08:49:36 +00002979 lock_ = OS::CreateMutex();
2980}
2981
2982
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002983LockingCommandMessageQueue::~LockingCommandMessageQueue() {
kasper.lund7276f142008-07-30 08:49:36 +00002984 delete lock_;
2985}
2986
2987
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002988bool LockingCommandMessageQueue::IsEmpty() const {
kasper.lund7276f142008-07-30 08:49:36 +00002989 ScopedLock sl(lock_);
2990 return queue_.IsEmpty();
2991}
2992
2993
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002994CommandMessage LockingCommandMessageQueue::Get() {
kasper.lund7276f142008-07-30 08:49:36 +00002995 ScopedLock sl(lock_);
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00002996 CommandMessage result = queue_.Get();
ager@chromium.org65dad4b2009-04-23 08:48:43 +00002997 Logger::DebugEvent("Get", result.text());
kasper.lund7276f142008-07-30 08:49:36 +00002998 return result;
2999}
3000
3001
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00003002void LockingCommandMessageQueue::Put(const CommandMessage& message) {
kasper.lund7276f142008-07-30 08:49:36 +00003003 ScopedLock sl(lock_);
3004 queue_.Put(message);
ager@chromium.org65dad4b2009-04-23 08:48:43 +00003005 Logger::DebugEvent("Put", message.text());
kasper.lund7276f142008-07-30 08:49:36 +00003006}
3007
3008
ager@chromium.org3a37e9b2009-04-27 09:26:21 +00003009void LockingCommandMessageQueue::Clear() {
kasper.lund7276f142008-07-30 08:49:36 +00003010 ScopedLock sl(lock_);
3011 queue_.Clear();
3012}
3013
sgjesse@chromium.orgb302e562010-02-03 11:26:59 +00003014
3015MessageDispatchHelperThread::MessageDispatchHelperThread()
3016 : sem_(OS::CreateSemaphore(0)), mutex_(OS::CreateMutex()),
3017 already_signalled_(false) {
3018}
3019
3020
3021MessageDispatchHelperThread::~MessageDispatchHelperThread() {
3022 delete mutex_;
3023 delete sem_;
3024}
3025
3026
3027void MessageDispatchHelperThread::Schedule() {
3028 {
3029 ScopedLock lock(mutex_);
3030 if (already_signalled_) {
3031 return;
3032 }
3033 already_signalled_ = true;
3034 }
3035 sem_->Signal();
3036}
3037
3038
3039void MessageDispatchHelperThread::Run() {
3040 while (true) {
3041 sem_->Wait();
3042 {
3043 ScopedLock lock(mutex_);
3044 already_signalled_ = false;
3045 }
3046 {
3047 Locker locker;
3048 Debugger::CallMessageDispatchHandler();
3049 }
3050 }
3051}
3052
ager@chromium.org65dad4b2009-04-23 08:48:43 +00003053#endif // ENABLE_DEBUGGER_SUPPORT
kasper.lund7276f142008-07-30 08:49:36 +00003054
christian.plesner.hansen43d26ec2008-07-03 15:10:15 +00003055} } // namespace v8::internal