| // Copyright 2010 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| |
| #include "v8.h" |
| |
| #include "liveedit.h" |
| #include "compiler.h" |
| #include "oprofile-agent.h" |
| #include "scopes.h" |
| #include "global-handles.h" |
| #include "debug.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| |
| static void CompileScriptForTracker(Handle<Script> script) { |
| const bool is_eval = false; |
| const bool is_global = true; |
| // TODO(635): support extensions. |
| Extension* extension = NULL; |
| |
| PostponeInterruptsScope postpone; |
| |
| // Only allow non-global compiles for eval. |
| ASSERT(is_eval || is_global); |
| |
| // Build AST. |
| ScriptDataImpl* pre_data = NULL; |
| FunctionLiteral* lit = MakeAST(is_global, script, extension, pre_data); |
| |
| // Check for parse errors. |
| if (lit == NULL) { |
| ASSERT(Top::has_pending_exception()); |
| return; |
| } |
| |
| // Compile the code. |
| CompilationInfo info(lit, script, is_eval); |
| Handle<Code> code = MakeCodeForLiveEdit(&info); |
| |
| // Check for stack-overflow exceptions. |
| if (code.is_null()) { |
| Top::StackOverflow(); |
| return; |
| } |
| } |
| |
| // Unwraps JSValue object, returning its field "value" |
| static Handle<Object> UnwrapJSValue(Handle<JSValue> jsValue) { |
| return Handle<Object>(jsValue->value()); |
| } |
| |
| // Wraps any object into a OpaqueReference, that will hide the object |
| // from JavaScript. |
| static Handle<JSValue> WrapInJSValue(Object* object) { |
| Handle<JSFunction> constructor = Top::opaque_reference_function(); |
| Handle<JSValue> result = |
| Handle<JSValue>::cast(Factory::NewJSObject(constructor)); |
| result->set_value(object); |
| return result; |
| } |
| |
| // Simple helper class that creates more or less typed structures over |
| // JSArray object. This is an adhoc method of passing structures from C++ |
| // to JavaScript. |
| template<typename S> |
| class JSArrayBasedStruct { |
| public: |
| static S Create() { |
| Handle<JSArray> array = Factory::NewJSArray(S::kSize_); |
| return S(array); |
| } |
| static S cast(Object* object) { |
| JSArray* array = JSArray::cast(object); |
| Handle<JSArray> array_handle(array); |
| return S(array_handle); |
| } |
| explicit JSArrayBasedStruct(Handle<JSArray> array) : array_(array) { |
| } |
| Handle<JSArray> GetJSArray() { |
| return array_; |
| } |
| protected: |
| void SetField(int field_position, Handle<Object> value) { |
| SetElement(array_, field_position, value); |
| } |
| void SetSmiValueField(int field_position, int value) { |
| SetElement(array_, field_position, Handle<Smi>(Smi::FromInt(value))); |
| } |
| Object* GetField(int field_position) { |
| return array_->GetElement(field_position); |
| } |
| int GetSmiValueField(int field_position) { |
| Object* res = GetField(field_position); |
| return Smi::cast(res)->value(); |
| } |
| private: |
| Handle<JSArray> array_; |
| }; |
| |
| |
| // Represents some function compilation details. This structure will be used |
| // from JavaScript. It contains Code object, which is kept wrapped |
| // into a BlindReference for sanitizing reasons. |
| class FunctionInfoWrapper : public JSArrayBasedStruct<FunctionInfoWrapper> { |
| public: |
| explicit FunctionInfoWrapper(Handle<JSArray> array) |
| : JSArrayBasedStruct<FunctionInfoWrapper>(array) { |
| } |
| void SetInitialProperties(Handle<String> name, int start_position, |
| int end_position, int param_num, int parent_index) { |
| HandleScope scope; |
| this->SetField(kFunctionNameOffset_, name); |
| this->SetSmiValueField(kStartPositionOffset_, start_position); |
| this->SetSmiValueField(kEndPositionOffset_, end_position); |
| this->SetSmiValueField(kParamNumOffset_, param_num); |
| this->SetSmiValueField(kParentIndexOffset_, parent_index); |
| } |
| void SetFunctionCode(Handle<Code> function_code) { |
| Handle<JSValue> wrapper = WrapInJSValue(*function_code); |
| this->SetField(kCodeOffset_, wrapper); |
| } |
| void SetScopeInfo(Handle<JSArray> scope_info_array) { |
| this->SetField(kScopeInfoOffset_, scope_info_array); |
| } |
| int GetParentIndex() { |
| return this->GetSmiValueField(kParentIndexOffset_); |
| } |
| Handle<Code> GetFunctionCode() { |
| Handle<Object> raw_result = UnwrapJSValue(Handle<JSValue>( |
| JSValue::cast(this->GetField(kCodeOffset_)))); |
| return Handle<Code>::cast(raw_result); |
| } |
| int GetStartPosition() { |
| return this->GetSmiValueField(kStartPositionOffset_); |
| } |
| int GetEndPosition() { |
| return this->GetSmiValueField(kEndPositionOffset_); |
| } |
| |
| private: |
| static const int kFunctionNameOffset_ = 0; |
| static const int kStartPositionOffset_ = 1; |
| static const int kEndPositionOffset_ = 2; |
| static const int kParamNumOffset_ = 3; |
| static const int kCodeOffset_ = 4; |
| static const int kScopeInfoOffset_ = 5; |
| static const int kParentIndexOffset_ = 6; |
| static const int kSize_ = 7; |
| |
| friend class JSArrayBasedStruct<FunctionInfoWrapper>; |
| }; |
| |
| // Wraps SharedFunctionInfo along with some of its fields for passing it |
| // back to JavaScript. SharedFunctionInfo object itself is additionally |
| // wrapped into BlindReference for sanitizing reasons. |
| class SharedInfoWrapper : public JSArrayBasedStruct<SharedInfoWrapper> { |
| public: |
| explicit SharedInfoWrapper(Handle<JSArray> array) |
| : JSArrayBasedStruct<SharedInfoWrapper>(array) { |
| } |
| |
| void SetProperties(Handle<String> name, int start_position, int end_position, |
| Handle<SharedFunctionInfo> info) { |
| HandleScope scope; |
| this->SetField(kFunctionNameOffset_, name); |
| Handle<JSValue> info_holder = WrapInJSValue(*info); |
| this->SetField(kSharedInfoOffset_, info_holder); |
| this->SetSmiValueField(kStartPositionOffset_, start_position); |
| this->SetSmiValueField(kEndPositionOffset_, end_position); |
| } |
| Handle<SharedFunctionInfo> GetInfo() { |
| Object* element = this->GetField(kSharedInfoOffset_); |
| Handle<JSValue> value_wrapper(JSValue::cast(element)); |
| Handle<Object> raw_result = UnwrapJSValue(value_wrapper); |
| return Handle<SharedFunctionInfo>::cast(raw_result); |
| } |
| |
| private: |
| static const int kFunctionNameOffset_ = 0; |
| static const int kStartPositionOffset_ = 1; |
| static const int kEndPositionOffset_ = 2; |
| static const int kSharedInfoOffset_ = 3; |
| static const int kSize_ = 4; |
| |
| friend class JSArrayBasedStruct<SharedInfoWrapper>; |
| }; |
| |
| class FunctionInfoListener { |
| public: |
| FunctionInfoListener() { |
| current_parent_index_ = -1; |
| len_ = 0; |
| result_ = Factory::NewJSArray(10); |
| } |
| |
| void FunctionStarted(FunctionLiteral* fun) { |
| HandleScope scope; |
| FunctionInfoWrapper info = FunctionInfoWrapper::Create(); |
| info.SetInitialProperties(fun->name(), fun->start_position(), |
| fun->end_position(), fun->num_parameters(), |
| current_parent_index_); |
| current_parent_index_ = len_; |
| SetElement(result_, len_, info.GetJSArray()); |
| len_++; |
| } |
| |
| void FunctionDone() { |
| HandleScope scope; |
| FunctionInfoWrapper info = |
| FunctionInfoWrapper::cast(result_->GetElement(current_parent_index_)); |
| current_parent_index_ = info.GetParentIndex(); |
| } |
| |
| void FunctionScope(Scope* scope) { |
| HandleScope handle_scope; |
| |
| Handle<JSArray> scope_info_list = Factory::NewJSArray(10); |
| int scope_info_length = 0; |
| |
| // Saves some description of scope. It stores name and indexes of |
| // variables in the whole scope chain. Null-named slots delimit |
| // scopes of this chain. |
| Scope* outer_scope = scope->outer_scope(); |
| if (outer_scope == NULL) { |
| return; |
| } |
| do { |
| ZoneList<Variable*> list(10); |
| outer_scope->CollectUsedVariables(&list); |
| int j = 0; |
| for (int i = 0; i < list.length(); i++) { |
| Variable* var1 = list[i]; |
| Slot* slot = var1->slot(); |
| if (slot != NULL && slot->type() == Slot::CONTEXT) { |
| if (j != i) { |
| list[j] = var1; |
| } |
| j++; |
| } |
| } |
| |
| // Sort it. |
| for (int k = 1; k < j; k++) { |
| int l = k; |
| for (int m = k + 1; m < j; m++) { |
| if (list[l]->slot()->index() > list[m]->slot()->index()) { |
| l = m; |
| } |
| } |
| list[k] = list[l]; |
| } |
| for (int i = 0; i < j; i++) { |
| SetElement(scope_info_list, scope_info_length, list[i]->name()); |
| scope_info_length++; |
| SetElement(scope_info_list, scope_info_length, |
| Handle<Smi>(Smi::FromInt(list[i]->slot()->index()))); |
| scope_info_length++; |
| } |
| SetElement(scope_info_list, scope_info_length, |
| Handle<Object>(Heap::null_value())); |
| scope_info_length++; |
| |
| outer_scope = outer_scope->outer_scope(); |
| } while (outer_scope != NULL); |
| |
| FunctionInfoWrapper info = |
| FunctionInfoWrapper::cast(result_->GetElement(current_parent_index_)); |
| info.SetScopeInfo(scope_info_list); |
| } |
| |
| void FunctionCode(Handle<Code> function_code) { |
| FunctionInfoWrapper info = |
| FunctionInfoWrapper::cast(result_->GetElement(current_parent_index_)); |
| info.SetFunctionCode(function_code); |
| } |
| |
| Handle<JSArray> GetResult() { |
| return result_; |
| } |
| |
| private: |
| Handle<JSArray> result_; |
| int len_; |
| int current_parent_index_; |
| }; |
| |
| static FunctionInfoListener* active_function_info_listener = NULL; |
| |
| JSArray* LiveEdit::GatherCompileInfo(Handle<Script> script, |
| Handle<String> source) { |
| CompilationZoneScope zone_scope(DELETE_ON_EXIT); |
| |
| FunctionInfoListener listener; |
| Handle<Object> original_source = Handle<Object>(script->source()); |
| script->set_source(*source); |
| active_function_info_listener = &listener; |
| CompileScriptForTracker(script); |
| active_function_info_listener = NULL; |
| script->set_source(*original_source); |
| |
| return *(listener.GetResult()); |
| } |
| |
| |
| void LiveEdit::WrapSharedFunctionInfos(Handle<JSArray> array) { |
| HandleScope scope; |
| int len = Smi::cast(array->length())->value(); |
| for (int i = 0; i < len; i++) { |
| Handle<SharedFunctionInfo> info( |
| SharedFunctionInfo::cast(array->GetElement(i))); |
| SharedInfoWrapper info_wrapper = SharedInfoWrapper::Create(); |
| Handle<String> name_handle(String::cast(info->name())); |
| info_wrapper.SetProperties(name_handle, info->start_position(), |
| info->end_position(), info); |
| array->SetElement(i, *(info_wrapper.GetJSArray())); |
| } |
| } |
| |
| |
| void LiveEdit::ReplaceFunctionCode(Handle<JSArray> new_compile_info_array, |
| Handle<JSArray> shared_info_array) { |
| HandleScope scope; |
| |
| FunctionInfoWrapper compile_info_wrapper(new_compile_info_array); |
| SharedInfoWrapper shared_info_wrapper(shared_info_array); |
| |
| Handle<SharedFunctionInfo> shared_info = shared_info_wrapper.GetInfo(); |
| |
| shared_info->set_code(*(compile_info_wrapper.GetFunctionCode()), |
| UPDATE_WRITE_BARRIER); |
| shared_info->set_start_position(compile_info_wrapper.GetStartPosition()); |
| shared_info->set_end_position(compile_info_wrapper.GetEndPosition()); |
| // update breakpoints, original code, constructor stub |
| } |
| |
| |
| void LiveEdit::RelinkFunctionToScript(Handle<JSArray> shared_info_array, |
| Handle<Script> script_handle) { |
| SharedInfoWrapper shared_info_wrapper(shared_info_array); |
| Handle<SharedFunctionInfo> shared_info = shared_info_wrapper.GetInfo(); |
| |
| shared_info->set_script(*script_handle); |
| } |
| |
| |
| // For a script text change (defined as position_change_array), translates |
| // position in unchanged text to position in changed text. |
| // Text change is a set of non-overlapping regions in text, that have changed |
| // their contents and length. It is specified as array of groups of 3 numbers: |
| // (change_begin, change_end, change_end_new_position). |
| // Each group describes a change in text; groups are sorted by change_begin. |
| // Only position in text beyond any changes may be successfully translated. |
| // If a positions is inside some region that changed, result is currently |
| // undefined. |
| static int TranslatePosition(int original_position, |
| Handle<JSArray> position_change_array) { |
| int position_diff = 0; |
| int array_len = Smi::cast(position_change_array->length())->value(); |
| // TODO(635): binary search may be used here |
| for (int i = 0; i < array_len; i += 3) { |
| int chunk_start = |
| Smi::cast(position_change_array->GetElement(i))->value(); |
| int chunk_end = |
| Smi::cast(position_change_array->GetElement(i + 1))->value(); |
| int chunk_changed_end = |
| Smi::cast(position_change_array->GetElement(i + 2))->value(); |
| position_diff = chunk_changed_end - chunk_end; |
| if (original_position < chunk_start) { |
| break; |
| } |
| // Position mustn't be inside a chunk. |
| ASSERT(original_position >= chunk_end); |
| } |
| |
| return original_position + position_diff; |
| } |
| |
| |
| void LiveEdit::PatchFunctionPositions(Handle<JSArray> shared_info_array, |
| Handle<JSArray> position_change_array) { |
| SharedInfoWrapper shared_info_wrapper(shared_info_array); |
| Handle<SharedFunctionInfo> info = shared_info_wrapper.GetInfo(); |
| |
| info->set_start_position(TranslatePosition(info->start_position(), |
| position_change_array)); |
| info->set_end_position(TranslatePosition(info->end_position(), |
| position_change_array)); |
| |
| // Also patch rinfos (both in working code and original code), breakpoints. |
| } |
| |
| |
| LiveEditFunctionTracker::LiveEditFunctionTracker(FunctionLiteral* fun) { |
| if (active_function_info_listener != NULL) { |
| active_function_info_listener->FunctionStarted(fun); |
| } |
| } |
| |
| |
| LiveEditFunctionTracker::~LiveEditFunctionTracker() { |
| if (active_function_info_listener != NULL) { |
| active_function_info_listener->FunctionDone(); |
| } |
| } |
| |
| |
| void LiveEditFunctionTracker::RecordFunctionCode(Handle<Code> code) { |
| if (active_function_info_listener != NULL) { |
| active_function_info_listener->FunctionCode(code); |
| } |
| } |
| |
| |
| void LiveEditFunctionTracker::RecordFunctionScope(Scope* scope) { |
| if (active_function_info_listener != NULL) { |
| active_function_info_listener->FunctionScope(scope); |
| } |
| } |
| |
| |
| bool LiveEditFunctionTracker::IsActive() { |
| return active_function_info_listener != NULL; |
| } |
| |
| |
| #else // ENABLE_DEBUGGER_SUPPORT |
| |
| // This ifdef-else-endif section provides working or stub implementation of |
| // LiveEditFunctionTracker. |
| LiveEditFunctionTracker::LiveEditFunctionTracker(FunctionLiteral* fun) { |
| } |
| |
| |
| LiveEditFunctionTracker::~LiveEditFunctionTracker() { |
| } |
| |
| |
| void LiveEditFunctionTracker::RecordFunctionCode(Handle<Code> code) { |
| } |
| |
| |
| void LiveEditFunctionTracker::RecordFunctionScope(Scope* scope) { |
| } |
| |
| |
| bool LiveEditFunctionTracker::IsActive() { |
| return false; |
| } |
| |
| #endif // ENABLE_DEBUGGER_SUPPORT |
| |
| |
| |
| } } // namespace v8::internal |