tball@google.com
95dfaf1718
independent version of strndup. Review URL: https://codereview.chromium.org//13587008 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@20936 260f80e4-7a28-3924-810f-c04153c831b5
393 lines
11 KiB
C++
393 lines
11 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_DEBUGGER_H_
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#define VM_DEBUGGER_H_
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#include "include/dart_debugger_api.h"
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#include "vm/object.h"
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#include "vm/port.h"
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namespace dart {
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class SourceBreakpoint;
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class CodeBreakpoint;
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class Isolate;
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class ObjectPointerVisitor;
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class ActiveVariables;
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class RemoteObjectCache;
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// SourceBreakpoint represents a user-specified breakpoint location in
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// Dart source. There may be more than one CodeBreakpoint object per
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// SourceBreakpoint.
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class SourceBreakpoint {
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public:
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SourceBreakpoint(intptr_t id, const Function& func, intptr_t token_pos);
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RawFunction* function() const { return function_; }
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intptr_t token_pos() const { return token_pos_; }
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intptr_t id() const { return id_; }
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RawScript* SourceCode();
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RawString* SourceUrl();
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intptr_t LineNumber();
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void Enable();
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void Disable();
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bool IsEnabled() const { return is_enabled_; }
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private:
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void VisitObjectPointers(ObjectPointerVisitor* visitor);
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void set_function(const Function& func);
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void set_next(SourceBreakpoint* value) { next_ = value; }
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SourceBreakpoint* next() const { return this->next_; }
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const intptr_t id_;
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RawFunction* function_;
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const intptr_t token_pos_;
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intptr_t line_number_;
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bool is_enabled_;
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SourceBreakpoint* next_;
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friend class Debugger;
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DISALLOW_COPY_AND_ASSIGN(SourceBreakpoint);
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};
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// CodeBreakpoint represents a location in compiled code. There may be
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// more than one CodeBreakpoint for one SourceBreakpoint, e.g. when a
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// function gets compiled as a regular function and as a closure.
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class CodeBreakpoint {
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public:
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CodeBreakpoint(const Function& func, intptr_t pc_desc_index);
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~CodeBreakpoint();
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RawFunction* function() const { return function_; }
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uword pc() const { return pc_; }
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intptr_t token_pos() const { return token_pos_; }
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bool IsInternal() const { return src_bpt_ == NULL; }
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RawScript* SourceCode();
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RawString* SourceUrl();
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intptr_t LineNumber();
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void Enable();
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void Disable();
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bool IsEnabled() const { return is_enabled_; }
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private:
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void VisitObjectPointers(ObjectPointerVisitor* visitor);
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SourceBreakpoint* src_bpt() const { return src_bpt_; }
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void set_src_bpt(SourceBreakpoint* value) { src_bpt_ = value; }
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void set_next(CodeBreakpoint* value) { next_ = value; }
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CodeBreakpoint* next() const { return this->next_; }
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intptr_t pc_desc_index() const { return pc_desc_index_; }
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void PatchCode();
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void RestoreCode();
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void PatchFunctionReturn();
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void RestoreFunctionReturn();
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RawFunction* function_;
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intptr_t pc_desc_index_;
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intptr_t token_pos_;
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uword pc_;
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intptr_t line_number_;
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bool is_enabled_;
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SourceBreakpoint* src_bpt_;
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CodeBreakpoint* next_;
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PcDescriptors::Kind breakpoint_kind_;
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union {
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uword target_address_;
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uint8_t raw[2 * sizeof(uword)];
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} saved_bytes_;
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friend class Debugger;
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DISALLOW_COPY_AND_ASSIGN(CodeBreakpoint);
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};
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// ActivationFrame represents one dart function activation frame
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// on the call stack.
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class ActivationFrame : public ZoneAllocated {
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public:
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ActivationFrame(uword pc, uword fp, uword sp, const Code& code);
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uword pc() const { return pc_; }
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uword fp() const { return fp_; }
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uword sp() const { return sp_; }
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const Function& function() const {
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ASSERT(!function_.IsNull());
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return function_;
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}
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const Code& code() const {
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ASSERT(!code_.IsNull());
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return code_;
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}
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RawString* QualifiedFunctionName();
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RawString* SourceUrl();
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RawScript* SourceScript();
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RawLibrary* Library();
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intptr_t TokenPos();
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intptr_t LineNumber();
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void SetContext(const Context& ctx) { ctx_ = ctx.raw(); }
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// The context level of a frame is the context level at the
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// PC/token index of the frame. It determines the depth of the context
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// chain that belongs to the function of this activation frame.
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intptr_t ContextLevel();
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const char* ToCString();
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intptr_t NumLocalVariables();
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void VariableAt(intptr_t i,
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String* name,
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intptr_t* token_pos,
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intptr_t* end_pos,
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Instance* value);
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RawArray* GetLocalVariables();
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RawContext* GetSavedContext();
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private:
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intptr_t PcDescIndex();
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intptr_t TryIndex();
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void GetPcDescriptors();
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void GetVarDescriptors();
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void GetDescIndices();
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RawInstance* GetLocalVarValue(intptr_t slot_index);
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RawInstance* GetInstanceCallReceiver(intptr_t num_actual_args);
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uword pc_;
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uword fp_;
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uword sp_;
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// The anchor of the context chain for this function.
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Context& ctx_;
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const Code& code_;
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const Function& function_;
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intptr_t token_pos_;
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intptr_t pc_desc_index_;
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intptr_t line_number_;
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intptr_t context_level_;
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bool vars_initialized_;
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LocalVarDescriptors& var_descriptors_;
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ZoneGrowableArray<intptr_t> desc_indices_;
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PcDescriptors& pc_desc_;
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friend class Debugger;
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friend class DebuggerStackTrace;
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DISALLOW_COPY_AND_ASSIGN(ActivationFrame);
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};
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// Array of function activations on the call stack.
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class DebuggerStackTrace : public ZoneAllocated {
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public:
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explicit DebuggerStackTrace(int capacity)
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: trace_(capacity) { }
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intptr_t Length() const { return trace_.length(); }
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ActivationFrame* ActivationFrameAt(int i) const {
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ASSERT(i < trace_.length());
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return trace_[i];
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}
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ActivationFrame* GetHandlerFrame(const Instance& exc_obj) const;
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private:
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void AddActivation(ActivationFrame* frame);
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ZoneGrowableArray<ActivationFrame*> trace_;
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friend class Debugger;
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DISALLOW_COPY_AND_ASSIGN(DebuggerStackTrace);
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};
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typedef void BreakpointHandler(Dart_Port isolate_id,
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SourceBreakpoint* bpt,
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DebuggerStackTrace* stack);
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class Debugger {
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public:
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enum EventType {
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kBreakpointReached = 1,
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kBreakpointResolved = 2,
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kExceptionThrown = 3,
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kIsolateCreated = 4,
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kIsolateShutdown = 5,
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kIsolateInterrupted = 6,
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};
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struct DebuggerEvent {
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EventType type;
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union {
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DebuggerStackTrace* stack_trace;
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SourceBreakpoint* breakpoint;
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const Object* exception;
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Dart_Port isolate_id;
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};
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};
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typedef void EventHandler(DebuggerEvent *event);
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Debugger();
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~Debugger();
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void Initialize(Isolate* isolate);
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void Shutdown();
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void NotifyCompilation(const Function& func);
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RawFunction* ResolveFunction(const Library& library,
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const String& class_name,
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const String& function_name);
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// Set breakpoint at closest location to function entry.
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SourceBreakpoint* SetBreakpointAtEntry(const Function& target_function);
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SourceBreakpoint* SetBreakpointAtLine(const String& script_url,
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intptr_t line_number);
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void OneTimeBreakAtEntry(const Function& target_function);
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void RemoveBreakpoint(intptr_t bp_id);
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SourceBreakpoint* GetBreakpointById(intptr_t id);
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void SetStepOver() { resume_action_ = kStepOver; }
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void SetStepInto() { resume_action_ = kStepInto; }
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void SetStepOut() { resume_action_ = kStepOut; }
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void SetExceptionPauseInfo(Dart_ExceptionPauseInfo pause_info);
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Dart_ExceptionPauseInfo GetExceptionPauseInfo();
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void VisitObjectPointers(ObjectPointerVisitor* visitor);
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// Called from Runtime when a breakpoint in Dart code is reached.
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void BreakpointCallback();
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// Returns true if there is at least one breakpoint set in func.
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// Checks for both user-defined and internal temporary breakpoints.
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bool HasBreakpoint(const Function& func);
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DebuggerStackTrace* StackTrace() const { return stack_trace_; }
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RawArray* GetInstanceFields(const Instance& obj);
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RawArray* GetStaticFields(const Class& cls);
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RawArray* GetLibraryFields(const Library& lib);
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RawArray* GetGlobalFields(const Library& lib);
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intptr_t CacheObject(const Object& obj);
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RawObject* GetCachedObject(intptr_t obj_id);
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bool IsValidObjectId(intptr_t obj_id);
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Dart_Port GetIsolateId() { return isolate_id_; }
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static void SetEventHandler(EventHandler* handler);
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static void SetBreakpointHandler(BreakpointHandler* handler);
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// Utility functions.
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static const char* QualifiedFunctionName(const Function& func);
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RawObject* GetInstanceField(const Class& cls,
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const String& field_name,
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const Instance& object);
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RawObject* GetStaticField(const Class& cls,
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const String& field_name);
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void SignalBpReached();
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void SignalExceptionThrown(const Instance& exc);
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static void SignalIsolateEvent(EventType type);
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private:
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enum ResumeAction {
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kContinue,
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kStepOver,
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kStepInto,
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kStepOut
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};
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void DeoptimizeWorld();
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void InstrumentForStepping(const Function& target_function);
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SourceBreakpoint* SetBreakpoint(const Function& target_function,
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intptr_t first_token_pos,
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intptr_t last_token_pos);
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void RemoveInternalBreakpoints();
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void UnlinkCodeBreakpoints(SourceBreakpoint* src_bpt);
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void RegisterSourceBreakpoint(SourceBreakpoint* bpt);
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void RegisterCodeBreakpoint(CodeBreakpoint* bpt);
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SourceBreakpoint* GetSourceBreakpoint(const Function& func,
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intptr_t token_pos);
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CodeBreakpoint* MakeCodeBreakpoint(const Function& func,
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intptr_t first_token_pos,
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intptr_t last_token_pos);
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// Returns NULL if no breakpoint exists for the given address.
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CodeBreakpoint* GetCodeBreakpoint(uword breakpoint_address);
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void SyncBreakpoint(SourceBreakpoint* bpt);
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static DebuggerStackTrace* CollectStackTrace();
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void SignalBpResolved(SourceBreakpoint *bpt);
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bool IsDebuggable(const Function& func);
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intptr_t nextId() { return next_id_++; }
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bool ShouldPauseOnException(DebuggerStackTrace* stack_trace,
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const Instance& exc);
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void CollectLibraryFields(const GrowableObjectArray& field_list,
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const Library& lib,
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const String& prefix,
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bool include_private_fields);
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Isolate* isolate_;
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Dart_Port isolate_id_; // A unique ID for the isolate in the debugger.
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bool initialized_;
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// ID number generator.
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intptr_t next_id_;
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// Current stack trace. Valid while executing breakpoint callback code.
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DebuggerStackTrace* stack_trace_;
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RemoteObjectCache* obj_cache_;
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SourceBreakpoint* src_breakpoints_;
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CodeBreakpoint* code_breakpoints_;
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// Tells debugger what to do when resuming execution after a breakpoint.
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ResumeAction resume_action_;
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// If >= 0, last_bpt_line contains the line number of the last breakpoint
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// location for which the breakpoint callback function was called.
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intptr_t last_bpt_line_;
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// Do not call back to breakpoint handler if this flag is set.
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// Effectively this means ignoring breakpoints. Set when Dart code may
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// be run as a side effect of getting values of fields.
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bool ignore_breakpoints_;
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intptr_t exc_pause_info_;
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static BreakpointHandler* bp_handler_;
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static EventHandler* event_handler_;
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friend class Isolate;
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friend class SourceBreakpoint;
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DISALLOW_COPY_AND_ASSIGN(Debugger);
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};
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} // namespace dart
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#endif // VM_DEBUGGER_H_
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