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01251efd5e9324bbf2dcfaee46bbaf3843ac22bd
sdk/runtime/vm/debugger.cc
T
hausner@google.com 1e955965df Better single stepping in VM debugger 
Single stepping now steps into the next dart code that the
user is interested in, including from one asynchronous task
to the next.

R=asiva@google.com

Review URL: https://codereview.chromium.org//17846009

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@24632 260f80e4-7a28-3924-810f-c04153c831b5
2013-07-01 17:29:18 +00:00

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58 KiB
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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/debugger.h"
#include "include/dart_api.h"
#include "vm/code_generator.h"
#include "vm/code_patcher.h"
#include "vm/compiler.h"
#include "vm/dart_entry.h"
#include "vm/flags.h"
#include "vm/globals.h"
#include "vm/longjump.h"
#include "vm/object.h"
#include "vm/object_store.h"
#include "vm/os.h"
#include "vm/port.h"
#include "vm/stack_frame.h"
#include "vm/stub_code.h"
#include "vm/symbols.h"
#include "vm/visitor.h"
namespace dart {
DEFINE_FLAG(bool, verbose_debug, false, "Verbose debugger messages");
Debugger::EventHandler* Debugger::event_handler_ = NULL;
class RemoteObjectCache : public ZoneAllocated {
public:
explicit RemoteObjectCache(intptr_t initial_size);
intptr_t AddObject(const Object& obj);
RawObject* GetObj(intptr_t obj_id) const;
bool IsValidId(intptr_t obj_id) const {
return obj_id < objs_->Length();
}
private:
GrowableObjectArray* objs_;
DISALLOW_COPY_AND_ASSIGN(RemoteObjectCache);
};
SourceBreakpoint::SourceBreakpoint(intptr_t id,
const Function& func,
intptr_t token_pos)
: id_(id),
function_(func.raw()),
token_pos_(token_pos),
line_number_(-1),
is_enabled_(false),
next_(NULL) {
ASSERT(!func.IsNull());
ASSERT((func.token_pos() <= token_pos_) &&
(token_pos_ <= func.end_token_pos()));
}
void SourceBreakpoint::Enable() {
is_enabled_ = true;
Isolate::Current()->debugger()->SyncBreakpoint(this);
}
void SourceBreakpoint::Disable() {
is_enabled_ = false;
Isolate::Current()->debugger()->SyncBreakpoint(this);
}
RawScript* SourceBreakpoint::SourceCode() {
const Function& func = Function::Handle(function_);
return func.script();
}
void SourceBreakpoint::GetCodeLocation(
Library* lib,
Script* script,
intptr_t* pos) {
const Function& func = Function::Handle(function_);
const Class& cls = Class::Handle(func.origin());
*lib = cls.library();
*script = func.script();
*pos = token_pos();
}
RawString* SourceBreakpoint::SourceUrl() {
const Script& script = Script::Handle(SourceCode());
return script.url();
}
intptr_t SourceBreakpoint::LineNumber() {
// Compute line number lazily since it causes scanning of the script.
if (line_number_ < 0) {
const Script& script = Script::Handle(SourceCode());
intptr_t ignore_column;
script.GetTokenLocation(token_pos_, &line_number_, &ignore_column);
}
return line_number_;
}
void SourceBreakpoint::set_function(const Function& func) {
function_ = func.raw();
}
void SourceBreakpoint::VisitObjectPointers(ObjectPointerVisitor* visitor) {
visitor->VisitPointer(reinterpret_cast<RawObject**>(&function_));
}
void CodeBreakpoint::VisitObjectPointers(ObjectPointerVisitor* visitor) {
visitor->VisitPointer(reinterpret_cast<RawObject**>(&function_));
}
ActivationFrame::ActivationFrame(uword pc, uword fp, uword sp, const Code& code)
: pc_(pc), fp_(fp), sp_(sp),
ctx_(Context::ZoneHandle()),
code_(Code::ZoneHandle(code.raw())),
function_(Function::ZoneHandle(code.function())),
token_pos_(-1),
pc_desc_index_(-1),
line_number_(-1),
context_level_(-1),
vars_initialized_(false),
var_descriptors_(LocalVarDescriptors::ZoneHandle()),
desc_indices_(8),
pc_desc_(PcDescriptors::ZoneHandle()) {
}
void Debugger::SignalIsolateEvent(EventType type) {
if (event_handler_ != NULL) {
Debugger* debugger = Isolate::Current()->debugger();
ASSERT(debugger != NULL);
DebuggerEvent event;
event.type = type;
event.isolate_id = debugger->GetIsolateId();
ASSERT(event.isolate_id != ILLEGAL_ISOLATE_ID);
if (type == kIsolateInterrupted) {
DebuggerStackTrace* stack_trace = debugger->CollectStackTrace();
ASSERT(stack_trace->Length() > 0);
ASSERT(debugger->stack_trace_ == NULL);
ASSERT(debugger->obj_cache_ == NULL);
debugger->obj_cache_ = new RemoteObjectCache(64);
debugger->stack_trace_ = stack_trace;
(*event_handler_)(&event);
debugger->stack_trace_ = NULL;
debugger->obj_cache_ = NULL; // Remote object cache is zone allocated.
// TODO(asiva): Need some work here to be able to single step after
// an interrupt.
} else {
(*event_handler_)(&event);
}
}
}
const char* Debugger::QualifiedFunctionName(const Function& func) {
const String& func_name = String::Handle(func.name());
Class& func_class = Class::Handle(func.Owner());
String& class_name = String::Handle(func_class.Name());
const char* kFormat = "%s%s%s";
intptr_t len = OS::SNPrint(NULL, 0, kFormat,
func_class.IsTopLevel() ? "" : class_name.ToCString(),
func_class.IsTopLevel() ? "" : ".",
func_name.ToCString());
len++; // String terminator.
char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
OS::SNPrint(chars, len, kFormat,
func_class.IsTopLevel() ? "" : class_name.ToCString(),
func_class.IsTopLevel() ? "" : ".",
func_name.ToCString());
return chars;
}
bool Debugger::HasBreakpoint(const Function& func) {
if (!func.HasCode()) {
// If the function is not compiled yet, just check whether there
// is a user-defined latent breakpoint.
SourceBreakpoint* sbpt = src_breakpoints_;
while (sbpt != NULL) {
if (func.raw() == sbpt->function()) {
return true;
}
sbpt = sbpt->next_;
}
return false;
}
CodeBreakpoint* cbpt = code_breakpoints_;
while (cbpt != NULL) {
if (func.raw() == cbpt->function()) {
return true;
}
cbpt = cbpt->next_;
}
return false;
}
RawString* ActivationFrame::QualifiedFunctionName() {
return String::New(Debugger::QualifiedFunctionName(function()));
}
RawString* ActivationFrame::SourceUrl() {
const Script& script = Script::Handle(SourceScript());
return script.url();
}
RawScript* ActivationFrame::SourceScript() {
return function().script();
}
RawLibrary* ActivationFrame::Library() {
const Class& cls = Class::Handle(function().Owner());
return cls.library();
}
void ActivationFrame::GetPcDescriptors() {
if (pc_desc_.IsNull()) {
pc_desc_ = code().pc_descriptors();
ASSERT(!pc_desc_.IsNull());
}
}
// Compute token_pos_ and pc_desc_index_.
intptr_t ActivationFrame::TokenPos() {
if (token_pos_ < 0) {
GetPcDescriptors();
for (int i = 0; i < pc_desc_.Length(); i++) {
if (pc_desc_.PC(i) == pc_) {
pc_desc_index_ = i;
token_pos_ = pc_desc_.TokenPos(i);
break;
}
}
}
return token_pos_;
}
intptr_t ActivationFrame::PcDescIndex() {
if (pc_desc_index_ < 0) {
TokenPos(); // Sets pc_desc_index_ as a side effect.
}
return pc_desc_index_;
}
intptr_t ActivationFrame::TryIndex() {
intptr_t desc_index = PcDescIndex();
if (desc_index < 0) {
return -1;
} else {
return pc_desc_.TryIndex(desc_index);
}
}
intptr_t ActivationFrame::LineNumber() {
// Compute line number lazily since it causes scanning of the script.
if ((line_number_ < 0) && (TokenPos() >= 0)) {
const Script& script = Script::Handle(SourceScript());
intptr_t ignore_column;
script.GetTokenLocation(TokenPos(), &line_number_, &ignore_column);
}
return line_number_;
}
void ActivationFrame::GetVarDescriptors() {
if (var_descriptors_.IsNull()) {
var_descriptors_ = code().var_descriptors();
ASSERT(!var_descriptors_.IsNull());
}
}
// Calculate the context level at the current token index of the frame.
intptr_t ActivationFrame::ContextLevel() {
if (context_level_ < 0 && !ctx_.IsNull()) {
ASSERT(!code_.is_optimized());
context_level_ = 0;
intptr_t pc_desc_idx = PcDescIndex();
// TODO(hausner): What to do if there is no descriptor entry
// for the code position of the frame? For now say we are at context
// level 0.
if (pc_desc_idx < 0) {
return context_level_;
}
ASSERT(!pc_desc_.IsNull());
if (pc_desc_.DescriptorKind(pc_desc_idx) == PcDescriptors::kReturn) {
// Special case: the context chain has already been deallocated.
// The context level is 0.
return context_level_;
}
intptr_t innermost_begin_pos = 0;
intptr_t activation_token_pos = TokenPos();
ASSERT(activation_token_pos >= 0);
GetVarDescriptors();
intptr_t var_desc_len = var_descriptors_.Length();
for (int cur_idx = 0; cur_idx < var_desc_len; cur_idx++) {
RawLocalVarDescriptors::VarInfo var_info;
var_descriptors_.GetInfo(cur_idx, &var_info);
if ((var_info.kind == RawLocalVarDescriptors::kContextLevel) &&
(var_info.begin_pos <= activation_token_pos) &&
(activation_token_pos < var_info.end_pos)) {
// This var_descriptors_ entry is a context scope which is in scope
// of the current token position. Now check whether it is shadowing
// the previous context scope.
if (innermost_begin_pos < var_info.begin_pos) {
innermost_begin_pos = var_info.begin_pos;
context_level_ = var_info.index;
}
}
}
ASSERT(context_level_ >= 0);
}
return context_level_;
}
// Get the caller's context, or return ctx if the function does not
// save the caller's context on entry.
RawContext* ActivationFrame::GetSavedEntryContext(const Context& ctx) {
GetVarDescriptors();
intptr_t var_desc_len = var_descriptors_.Length();
for (int i = 0; i < var_desc_len; i++) {
RawLocalVarDescriptors::VarInfo var_info;
var_descriptors_.GetInfo(i, &var_info);
if (var_info.kind == RawLocalVarDescriptors::kSavedEntryContext) {
return reinterpret_cast<RawContext*>(GetLocalVarValue(var_info.index));
}
}
return ctx.raw();
}
// Get the saved context if the callee of this activation frame is a
// closure function.
RawContext* ActivationFrame::GetSavedCurrentContext() {
GetVarDescriptors();
intptr_t var_desc_len = var_descriptors_.Length();
for (int i = 0; i < var_desc_len; i++) {
RawLocalVarDescriptors::VarInfo var_info;
var_descriptors_.GetInfo(i, &var_info);
if (var_info.kind == RawLocalVarDescriptors::kSavedCurrentContext) {
return reinterpret_cast<RawContext*>(GetLocalVarValue(var_info.index));
}
}
return Context::null();
}
ActivationFrame* DebuggerStackTrace::GetHandlerFrame(
const Instance& exc_obj) const {
ExceptionHandlers& handlers = ExceptionHandlers::Handle();
Array& handled_types = Array::Handle();
AbstractType& type = Type::Handle();
const TypeArguments& no_instantiator = TypeArguments::Handle();
for (int frame_index = 0; frame_index < Length(); frame_index++) {
ActivationFrame* frame = trace_[frame_index];
intptr_t try_index = frame->TryIndex();
if (try_index < 0) continue;
handlers = frame->code().exception_handlers();
ASSERT(!handlers.IsNull());
intptr_t num_handlers_checked = 0;
while (try_index >= 0) {
// Detect circles in the exception handler data.
num_handlers_checked++;
ASSERT(num_handlers_checked <= handlers.Length());
handled_types = handlers.GetHandledTypes(try_index);
const intptr_t num_types = handled_types.Length();
for (int k = 0; k < num_types; k++) {
type ^= handled_types.At(k);
ASSERT(!type.IsNull());
// Uninstantiated types are not added to ExceptionHandlers data.
ASSERT(type.IsInstantiated());
if (type.IsDynamicType()) return frame;
if (type.IsMalformed()) continue;
if (exc_obj.IsInstanceOf(type, no_instantiator, NULL)) {
return frame;
}
}
try_index = handlers.OuterTryIndex(try_index);
}
}
return NULL;
}
void ActivationFrame::GetDescIndices() {
if (vars_initialized_) {
return;
}
GetVarDescriptors();
// We don't trust variable descriptors in optimized code.
// Rather than potentially displaying incorrect values, we
// pretend that there are no variables in the frame.
// We should be more clever about this in the future.
if (code().is_optimized()) {
vars_initialized_ = true;
return;
}
intptr_t activation_token_pos = TokenPos();
if (activation_token_pos < 0) {
// We don't have a token position for this frame, so can't determine
// which variables are visible.
vars_initialized_ = true;
return;
}
GrowableArray<String*> var_names(8);
intptr_t var_desc_len = var_descriptors_.Length();
for (int cur_idx = 0; cur_idx < var_desc_len; cur_idx++) {
ASSERT(var_names.length() == desc_indices_.length());
RawLocalVarDescriptors::VarInfo var_info;
var_descriptors_.GetInfo(cur_idx, &var_info);
if ((var_info.kind != RawLocalVarDescriptors::kStackVar) &&
(var_info.kind != RawLocalVarDescriptors::kContextVar)) {
continue;
}
if ((var_info.begin_pos <= activation_token_pos) &&
(activation_token_pos <= var_info.end_pos)) {
if ((var_info.kind == RawLocalVarDescriptors::kContextVar) &&
(ContextLevel() < var_info.scope_id)) {
// The variable is textually in scope but the context level
// at the activation frame's PC is lower than the context
// level of the variable. The context containing the variable
// has already been removed from the chain. This can happen when we
// break at a return statement, since the contexts get discarded
// before the debugger gets called.
continue;
}
// The current variable is textually in scope. Now check whether
// there is another local variable with the same name that shadows
// or is shadowed by this variable.
String& var_name = String::Handle(var_descriptors_.GetName(cur_idx));
intptr_t indices_len = desc_indices_.length();
bool name_match_found = false;
for (int i = 0; i < indices_len; i++) {
if (var_name.Equals(*var_names[i])) {
// Found two local variables with the same name. Now determine
// which one is shadowed.
name_match_found = true;
RawLocalVarDescriptors::VarInfo i_var_info;
var_descriptors_.GetInfo(desc_indices_[i], &i_var_info);
if (i_var_info.begin_pos < var_info.begin_pos) {
// The variable we found earlier is in an outer scope
// and is shadowed by the current variable. Replace the
// descriptor index of the previously found variable
// with the descriptor index of the current variable.
desc_indices_[i] = cur_idx;
} else {
// The variable we found earlier is in an inner scope
// and shadows the current variable. Skip the current
// variable. (Nothing to do.)
}
break; // Stop looking for name matches.
}
}
if (!name_match_found) {
// No duplicate name found. Add the current descriptor index to the
// list of visible variables.
desc_indices_.Add(cur_idx);
var_names.Add(&var_name);
}
}
}
vars_initialized_ = true;
}
intptr_t ActivationFrame::NumLocalVariables() {
GetDescIndices();
return desc_indices_.length();
}
void ActivationFrame::VariableAt(intptr_t i,
String* name,
intptr_t* token_pos,
intptr_t* end_pos,
Instance* value) {
GetDescIndices();
ASSERT(i < desc_indices_.length());
intptr_t desc_index = desc_indices_[i];
ASSERT(name != NULL);
*name ^= var_descriptors_.GetName(desc_index);
RawLocalVarDescriptors::VarInfo var_info;
var_descriptors_.GetInfo(desc_index, &var_info);
ASSERT(token_pos != NULL);
*token_pos = var_info.begin_pos;
ASSERT(end_pos != NULL);
*end_pos = var_info.end_pos;
ASSERT(value != NULL);
if (var_info.kind == RawLocalVarDescriptors::kStackVar) {
*value = GetLocalVarValue(var_info.index);
} else {
ASSERT(var_info.kind == RawLocalVarDescriptors::kContextVar);
// The context level at the PC/token index of this activation frame.
intptr_t frame_ctx_level = ContextLevel();
if (ctx_.IsNull()) {
*value = Symbols::New("<unknown>");
return;
}
// The context level of the variable.
intptr_t var_ctx_level = var_info.scope_id;
intptr_t level_diff = frame_ctx_level - var_ctx_level;
intptr_t ctx_slot = var_info.index;
if (level_diff == 0) {
*value = ctx_.At(ctx_slot);
} else {
ASSERT(level_diff > 0);
Context& ctx = Context::Handle(ctx_.raw());
while (level_diff > 0) {
ASSERT(!ctx.IsNull());
level_diff--;
ctx = ctx.parent();
}
ASSERT(!ctx.IsNull());
*value = ctx.At(ctx_slot);
}
}
}
RawArray* ActivationFrame::GetLocalVariables() {
GetDescIndices();
intptr_t num_variables = desc_indices_.length();
String& var_name = String::Handle();
Instance& value = Instance::Handle();
const Array& list = Array::Handle(Array::New(2 * num_variables));
for (int i = 0; i < num_variables; i++) {
intptr_t ignore;
VariableAt(i, &var_name, &ignore, &ignore, &value);
list.SetAt(2 * i, var_name);
list.SetAt((2 * i) + 1, value);
}
return list.raw();
}
const char* ActivationFrame::ToCString() {
const char* kFormat = "Function: '%s' url: '%s' line: %d";
const String& url = String::Handle(SourceUrl());
intptr_t line = LineNumber();
const char* func_name = Debugger::QualifiedFunctionName(function());
intptr_t len =
OS::SNPrint(NULL, 0, kFormat, func_name, url.ToCString(), line);
len++; // String terminator.
char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
OS::SNPrint(chars, len, kFormat, func_name, url.ToCString(), line);
return chars;
}
void DebuggerStackTrace::AddActivation(ActivationFrame* frame) {
trace_.Add(frame);
}
static bool IsSafePoint(PcDescriptors::Kind kind) {
return ((kind == PcDescriptors::kIcCall) ||
(kind == PcDescriptors::kOptStaticCall) ||
(kind == PcDescriptors::kUnoptStaticCall) ||
(kind == PcDescriptors::kClosureCall) ||
(kind == PcDescriptors::kReturn) ||
(kind == PcDescriptors::kRuntimeCall));
}
CodeBreakpoint::CodeBreakpoint(const Function& func, intptr_t pc_desc_index)
: function_(func.raw()),
pc_desc_index_(pc_desc_index),
pc_(0),
line_number_(-1),
is_enabled_(false),
src_bpt_(NULL),
next_(NULL) {
ASSERT(!func.HasOptimizedCode());
Code& code = Code::Handle(func.unoptimized_code());
ASSERT(!code.IsNull()); // Function must be compiled.
PcDescriptors& desc = PcDescriptors::Handle(code.pc_descriptors());
ASSERT(pc_desc_index < desc.Length());
token_pos_ = desc.TokenPos(pc_desc_index);
ASSERT(token_pos_ >= 0);
pc_ = desc.PC(pc_desc_index);
ASSERT(pc_ != 0);
breakpoint_kind_ = desc.DescriptorKind(pc_desc_index);
ASSERT(IsSafePoint(breakpoint_kind_));
}
CodeBreakpoint::~CodeBreakpoint() {
// Make sure we don't leave patched code behind.
ASSERT(!IsEnabled());
// Poison the data so we catch use after free errors.
#ifdef DEBUG
function_ = Function::null();
pc_ = 0ul;
src_bpt_ = NULL;
next_ = NULL;
breakpoint_kind_ = PcDescriptors::kOther;
#endif
}
RawScript* CodeBreakpoint::SourceCode() {
const Function& func = Function::Handle(function_);
return func.script();
}
RawString* CodeBreakpoint::SourceUrl() {
const Script& script = Script::Handle(SourceCode());
return script.url();
}
intptr_t CodeBreakpoint::LineNumber() {
// Compute line number lazily since it causes scanning of the script.
if (line_number_ < 0) {
const Script& script = Script::Handle(SourceCode());
intptr_t ignore_column;
script.GetTokenLocation(token_pos_, &line_number_, &ignore_column);
}
return line_number_;
}
void CodeBreakpoint::PatchCode() {
ASSERT(!is_enabled_);
switch (breakpoint_kind_) {
case PcDescriptors::kIcCall: {
const Code& code =
Code::Handle(Function::Handle(function_).unoptimized_code());
saved_bytes_.target_address_ =
CodePatcher::GetInstanceCallAt(pc_, code, NULL);
CodePatcher::PatchInstanceCallAt(pc_, code,
StubCode::BreakpointDynamicEntryPoint());
break;
}
case PcDescriptors::kUnoptStaticCall: {
const Code& code =
Code::Handle(Function::Handle(function_).unoptimized_code());
saved_bytes_.target_address_ =
CodePatcher::GetStaticCallTargetAt(pc_, code);
CodePatcher::PatchStaticCallAt(pc_, code,
StubCode::BreakpointStaticEntryPoint());
break;
}
case PcDescriptors::kRuntimeCall:
case PcDescriptors::kClosureCall: {
const Code& code =
Code::Handle(Function::Handle(function_).unoptimized_code());
saved_bytes_.target_address_ =
CodePatcher::GetStaticCallTargetAt(pc_, code);
CodePatcher::PatchStaticCallAt(pc_, code,
StubCode::BreakpointRuntimeEntryPoint());
break;
}
case PcDescriptors::kReturn:
PatchFunctionReturn();
break;
default:
UNREACHABLE();
}
is_enabled_ = true;
}
void CodeBreakpoint::RestoreCode() {
ASSERT(is_enabled_);
switch (breakpoint_kind_) {
case PcDescriptors::kIcCall: {
const Code& code =
Code::Handle(Function::Handle(function_).unoptimized_code());
CodePatcher::PatchInstanceCallAt(pc_, code,
saved_bytes_.target_address_);
break;
}
case PcDescriptors::kUnoptStaticCall:
case PcDescriptors::kClosureCall:
case PcDescriptors::kRuntimeCall: {
const Code& code =
Code::Handle(Function::Handle(function_).unoptimized_code());
CodePatcher::PatchStaticCallAt(pc_, code,
saved_bytes_.target_address_);
break;
}
case PcDescriptors::kReturn:
RestoreFunctionReturn();
break;
default:
UNREACHABLE();
}
is_enabled_ = false;
}
void CodeBreakpoint::Enable() {
if (!is_enabled_) {
PatchCode();
}
ASSERT(is_enabled_);
}
void CodeBreakpoint::Disable() {
if (is_enabled_) {
RestoreCode();
}
ASSERT(!is_enabled_);
}
RemoteObjectCache::RemoteObjectCache(intptr_t initial_size) {
objs_ = &GrowableObjectArray::ZoneHandle(
GrowableObjectArray::New(initial_size));
}
intptr_t RemoteObjectCache::AddObject(const Object& obj) {
intptr_t len = objs_->Length();
for (int i = 0; i < len; i++) {
if (objs_->At(i) == obj.raw()) {
return i;
}
}
objs_->Add(obj);
return len;
}
RawObject* RemoteObjectCache::GetObj(intptr_t obj_id) const {
ASSERT(IsValidId(obj_id));
return objs_->At(obj_id);
}
Debugger::Debugger()
: isolate_(NULL),
isolate_id_(ILLEGAL_ISOLATE_ID),
initialized_(false),
next_id_(1),
stack_trace_(NULL),
obj_cache_(NULL),
src_breakpoints_(NULL),
code_breakpoints_(NULL),
resume_action_(kContinue),
ignore_breakpoints_(false),
in_event_notification_(false),
exc_pause_info_(kNoPauseOnExceptions) {
}
Debugger::~Debugger() {
PortMap::ClosePort(isolate_id_);
isolate_id_ = ILLEGAL_ISOLATE_ID;
ASSERT(!in_event_notification_);
ASSERT(src_breakpoints_ == NULL);
ASSERT(code_breakpoints_ == NULL);
ASSERT(stack_trace_ == NULL);
ASSERT(obj_cache_ == NULL);
}
void Debugger::Shutdown() {
while (src_breakpoints_ != NULL) {
SourceBreakpoint* bpt = src_breakpoints_;
src_breakpoints_ = src_breakpoints_->next();
delete bpt;
}
while (code_breakpoints_ != NULL) {
CodeBreakpoint* bpt = code_breakpoints_;
code_breakpoints_ = code_breakpoints_->next();
bpt->Disable();
delete bpt;
}
// Signal isolate shutdown event.
SignalIsolateEvent(Debugger::kIsolateShutdown);
}
static RawFunction* ResolveLibraryFunction(
const Library& library,
const String& fname) {
ASSERT(!library.IsNull());
const Object& object = Object::Handle(library.LookupObject(fname));
if (!object.IsNull() && object.IsFunction()) {
return Function::Cast(object).raw();
}
return Function::null();
}
void Debugger::SetSingleStep() {
isolate_->set_single_step(true);
resume_action_ = kSingleStep;
}
void Debugger::SetStepOver() {
isolate_->set_single_step(false);
resume_action_ = kStepOver;
}
void Debugger::SetStepOut() {
isolate_->set_single_step(false);
resume_action_ = kStepOut;
}
RawFunction* Debugger::ResolveFunction(const Library& library,
const String& class_name,
const String& function_name) {
ASSERT(!library.IsNull());
ASSERT(!class_name.IsNull());
ASSERT(!function_name.IsNull());
if (class_name.Length() == 0) {
return ResolveLibraryFunction(library, function_name);
}
const Class& cls = Class::Handle(library.LookupClass(class_name));
Function& function = Function::Handle();
if (!cls.IsNull()) {
function = cls.LookupStaticFunction(function_name);
if (function.IsNull()) {
function = cls.LookupDynamicFunction(function_name);
}
}
return function.raw();
}
// Deoptimize all functions in the isolate.
// TODO(hausner): Actually we only need to deoptimize those functions
// that inline the function that contains the newly created breakpoint.
// We currently don't have this info so we deoptimize all functions.
void Debugger::DeoptimizeWorld() {
// Deoptimize all functions in stack activation frames.
DeoptimizeAll();
// Iterate over all classes, deoptimize functions.
// TODO(hausner): Could possibly be combined with RemoveOptimizedCode()
const ClassTable& class_table = *isolate_->class_table();
Class& cls = Class::Handle();
Array& functions = Array::Handle();
Function& function = Function::Handle();
intptr_t num_classes = class_table.NumCids();
for (intptr_t i = 1; i < num_classes; i++) {
if (class_table.HasValidClassAt(i)) {
cls = class_table.At(i);
functions = cls.functions();
intptr_t num_functions = functions.IsNull() ? 0 : functions.Length();
for (intptr_t f = 0; f < num_functions; f++) {
function ^= functions.At(f);
ASSERT(!function.IsNull());
if (function.HasOptimizedCode()) {
function.SwitchToUnoptimizedCode();
}
}
}
}
}
void Debugger::InstrumentForStepping(const Function& target_function) {
if (target_function.is_native()) {
// Can't instrument native functions.
return;
}
if (!target_function.HasCode()) {
Compiler::CompileFunction(target_function);
// If there were any errors, ignore them silently and return without
// adding breakpoints to target.
if (!target_function.HasCode()) {
return;
}
}
DeoptimizeWorld();
ASSERT(!target_function.HasOptimizedCode());
Code& code = Code::Handle(target_function.unoptimized_code());
ASSERT(!code.IsNull());
PcDescriptors& desc = PcDescriptors::Handle(code.pc_descriptors());
for (int i = 0; i < desc.Length(); i++) {
CodeBreakpoint* bpt = GetCodeBreakpoint(desc.PC(i));
if (bpt != NULL) {
// There is already a breakpoint for this address. Make sure
// it is enabled.
bpt->Enable();
continue;
}
if (IsSafePoint(desc.DescriptorKind(i))) {
bpt = new CodeBreakpoint(target_function, i);
RegisterCodeBreakpoint(bpt);
bpt->Enable();
}
}
}
void Debugger::SignalBpResolved(SourceBreakpoint* bpt) {
if (event_handler_ != NULL) {
DebuggerEvent event;
event.type = kBreakpointResolved;
event.breakpoint = bpt;
(*event_handler_)(&event);
}
}
DebuggerStackTrace* Debugger::CollectStackTrace() {
Isolate* isolate = Isolate::Current();
DebuggerStackTrace* stack_trace = new DebuggerStackTrace(8);
Context& ctx = Context::Handle(isolate->top_context());
Code& code = Code::Handle(isolate);
StackFrameIterator iterator(false);
StackFrame* frame = iterator.NextFrame();
ActivationFrame* callee_activation = NULL;
bool optimized_frame_found = false;
while (frame != NULL) {
ASSERT(frame->IsValid());
if (frame->IsDartFrame()) {
code = frame->LookupDartCode();
ActivationFrame* activation =
new ActivationFrame(frame->pc(), frame->fp(), frame->sp(), code);
// If this activation frame called a closure, the function has
// saved its context before the call.
if ((callee_activation != NULL) &&
(callee_activation->function().IsClosureFunction())) {
ctx = activation->GetSavedCurrentContext();
if (FLAG_verbose_debug && ctx.IsNull()) {
const Function& caller = activation->function();
const Function& callee = callee_activation->function();
const Script& script =
Script::Handle(Class::Handle(caller.Owner()).script());
intptr_t line, col;
script.GetTokenLocation(activation->TokenPos(), &line, &col);
OS::Print("CollectStackTrace error: no saved context in function "
"'%s' which calls closure '%s' "
" in line %"Pd" column %"Pd"\n",
caller.ToFullyQualifiedCString(),
callee.ToFullyQualifiedCString(),
line, col);
}
ASSERT(!ctx.IsNull());
}
if (optimized_frame_found || code.is_optimized()) {
// Set context to null, to avoid returning bad context variable values.
activation->SetContext(Context::Handle());
optimized_frame_found = true;
} else {
activation->SetContext(ctx);
}
stack_trace->AddActivation(activation);
callee_activation = activation;
// Get caller's context if this function saved it on entry.
ctx = activation->GetSavedEntryContext(ctx);
} else if (frame->IsEntryFrame()) {
ctx = reinterpret_cast<EntryFrame*>(frame)->SavedContext();
callee_activation = NULL;
}
frame = iterator.NextFrame();
}
return stack_trace;
}
ActivationFrame* Debugger::TopDartFrame() const {
StackFrameIterator iterator(false);
StackFrame* frame = iterator.NextFrame();
while ((frame != NULL) && !frame->IsDartFrame()) {
frame = iterator.NextFrame();
}
Code& code = Code::Handle(isolate_, frame->LookupDartCode());
ActivationFrame* activation =
new ActivationFrame(frame->pc(), frame->fp(), frame->sp(), code);
return activation;
}
DebuggerStackTrace* Debugger::StackTrace() {
return (stack_trace_ != NULL) ? stack_trace_ : CollectStackTrace();
}
void Debugger::SetExceptionPauseInfo(Dart_ExceptionPauseInfo pause_info) {
ASSERT((pause_info == kNoPauseOnExceptions) ||
(pause_info == kPauseOnUnhandledExceptions) ||
(pause_info == kPauseOnAllExceptions));
exc_pause_info_ = pause_info;
}
Dart_ExceptionPauseInfo Debugger::GetExceptionPauseInfo() {
return exc_pause_info_;
}
bool Debugger::ShouldPauseOnException(DebuggerStackTrace* stack_trace,
const Instance& exc) {
if (exc_pause_info_ == kNoPauseOnExceptions) {
return false;
}
if (exc_pause_info_ == kPauseOnAllExceptions) {
return true;
}
ASSERT(exc_pause_info_ == kPauseOnUnhandledExceptions);
ActivationFrame* handler_frame = stack_trace->GetHandlerFrame(exc);
if (handler_frame == NULL) {
// Did not find an exception handler that catches this exception.
// Note that this check is not precise, since we can't check
// uninstantiated types, i.e. types containing type parameters.
// Thus, we may report an exception as unhandled when in fact
// it will be caught once we unwind the stack.
return true;
}
return false;
}
void Debugger::SignalExceptionThrown(const Instance& exc) {
// We ignore this exception event when the VM is executing code invoked
// by the debugger to evaluate variables values, when we see a nested
// breakpoint or exception event, or if the debugger is not
// interested in exception events.
if (ignore_breakpoints_ ||
in_event_notification_ ||
(event_handler_ == NULL) ||
(exc_pause_info_ == kNoPauseOnExceptions)) {
return;
}
DebuggerStackTrace* stack_trace = CollectStackTrace();
if (!ShouldPauseOnException(stack_trace, exc)) {
return;
}
ASSERT(stack_trace_ == NULL);
stack_trace_ = stack_trace;
ASSERT(obj_cache_ == NULL);
obj_cache_ = new RemoteObjectCache(64);
DebuggerEvent event;
event.type = kExceptionThrown;
event.exception = &exc;
(*event_handler_)(&event);
stack_trace_ = NULL;
obj_cache_ = NULL; // Remote object cache is zone allocated.
}
// Given a function and a token position range, return the best fit
// token position to set a breakpoint.
// If multiple possible breakpoint positions are within the given range,
// the one with the lowest machine code address is picked.
// If no possible breakpoint location exists in the given range, the closest
// token position after the range is returned.
intptr_t Debugger::ResolveBreakpointPos(const Function& func,
intptr_t first_token_pos,
intptr_t last_token_pos) {
ASSERT(func.HasCode());
ASSERT(!func.HasOptimizedCode());
Code& code = Code::Handle(func.unoptimized_code());
ASSERT(!code.IsNull());
PcDescriptors& desc = PcDescriptors::Handle(code.pc_descriptors());
intptr_t best_fit_index = -1;
intptr_t best_fit = INT_MAX;
uword lowest_pc = kUwordMax;
intptr_t lowest_pc_index = -1;
for (int i = 0; i < desc.Length(); i++) {
intptr_t desc_token_pos = desc.TokenPos(i);
ASSERT(desc_token_pos >= 0);
if (desc_token_pos < first_token_pos) {
// This descriptor is before the given range.
continue;
}
if (IsSafePoint(desc.DescriptorKind(i))) {
if ((desc_token_pos - first_token_pos) < best_fit) {
// So far, this descriptor has the closest token position to the
// beginning of the range.
best_fit = desc_token_pos - first_token_pos;
ASSERT(best_fit >= 0);
best_fit_index = i;
}
if ((first_token_pos <= desc_token_pos) &&
(desc_token_pos <= last_token_pos) &&
(desc.PC(i) < lowest_pc)) {
// This descriptor is within the token position range and so
// far has the lowest code address.
lowest_pc = desc.PC(i);
lowest_pc_index = i;
}
}
}
if (lowest_pc_index >= 0) {
// We found the the pc descriptor within the given token range that
// has the lowest execution address. This is the first possible
// breakpoint on the line. We use this instead of the nearest
// PC descriptor measured in token index distance.
best_fit_index = lowest_pc_index;
}
if (best_fit_index >= 0) {
return desc.TokenPos(best_fit_index);
}
return -1;
}
void Debugger::MakeCodeBreakpointsAt(const Function& func,
intptr_t token_pos,
SourceBreakpoint* bpt) {
ASSERT(!func.HasOptimizedCode());
Code& code = Code::Handle(func.unoptimized_code());
ASSERT(!code.IsNull());
PcDescriptors& desc = PcDescriptors::Handle(code.pc_descriptors());
for (int i = 0; i < desc.Length(); i++) {
intptr_t desc_token_pos = desc.TokenPos(i);
if ((desc_token_pos == token_pos) && IsSafePoint(desc.DescriptorKind(i))) {
CodeBreakpoint* code_bpt = GetCodeBreakpoint(desc.PC(i));
if (code_bpt == NULL) {
// No code breakpoint for this code exists; create one.
code_bpt = new CodeBreakpoint(func, i);
RegisterCodeBreakpoint(code_bpt);
}
code_bpt->set_src_bpt(bpt);
}
}
}
SourceBreakpoint* Debugger::SetBreakpoint(const Function& target_function,
intptr_t first_token_pos,
intptr_t last_token_pos) {
if ((last_token_pos < target_function.token_pos()) ||
(target_function.end_token_pos() < first_token_pos)) {
// The given token position is not within the target function.
return NULL;
}
intptr_t breakpoint_pos = -1;
Function& closure = Function::Handle(isolate_);
if (target_function.HasImplicitClosureFunction()) {
// There is a closurized version of this function.
closure = target_function.ImplicitClosureFunction();
}
// Determine actual breakpoint location if the function or an
// implicit closure of the function has been compiled already.
if (target_function.HasCode()) {
DeoptimizeWorld();
ASSERT(!target_function.HasOptimizedCode());
breakpoint_pos =
ResolveBreakpointPos(target_function, first_token_pos, last_token_pos);
} else if (!closure.IsNull() && closure.HasCode()) {
DeoptimizeWorld();
ASSERT(!closure.HasOptimizedCode());
breakpoint_pos =
ResolveBreakpointPos(closure, first_token_pos, last_token_pos);
} else {
// This function has not been compiled yet. Set a pending
// breakpoint to be resolved later.
SourceBreakpoint* source_bpt =
GetSourceBreakpoint(target_function, first_token_pos);
if (source_bpt != NULL) {
// A pending source breakpoint for this uncompiled location
// already exists.
if (FLAG_verbose_debug) {
OS::Print("Pending breakpoint for uncompiled function"
" '%s' at line %"Pd" already exists\n",
target_function.ToFullyQualifiedCString(),
source_bpt->LineNumber());
}
return source_bpt;
}
source_bpt =
new SourceBreakpoint(nextId(), target_function, first_token_pos);
RegisterSourceBreakpoint(source_bpt);
if (FLAG_verbose_debug) {
OS::Print("Registering pending breakpoint for "
"uncompiled function '%s' at line %"Pd"\n",
target_function.ToFullyQualifiedCString(),
source_bpt->LineNumber());
}
source_bpt->Enable();
return source_bpt;
}
ASSERT(breakpoint_pos != -1);
SourceBreakpoint* source_bpt =
GetSourceBreakpoint(target_function, breakpoint_pos);
if (source_bpt != NULL) {
// A source breakpoint for this location already exists.
return source_bpt;
}
source_bpt = new SourceBreakpoint(nextId(), target_function, breakpoint_pos);
RegisterSourceBreakpoint(source_bpt);
if (target_function.HasCode()) {
MakeCodeBreakpointsAt(target_function, breakpoint_pos, source_bpt);
}
if (!closure.IsNull() && closure.HasCode()) {
MakeCodeBreakpointsAt(closure, breakpoint_pos, source_bpt);
}
source_bpt->Enable();
SignalBpResolved(source_bpt);
return source_bpt;
}
// Synchronize the enabled/disabled state of all code breakpoints
// associated with the source breakpoint bpt.
void Debugger::SyncBreakpoint(SourceBreakpoint* bpt) {
CodeBreakpoint* cbpt = code_breakpoints_;
while (cbpt != NULL) {
if (bpt == cbpt->src_bpt()) {
if (bpt->IsEnabled()) {
cbpt->Enable();
} else {
cbpt->Disable();
}
}
cbpt = cbpt->next();
}
}
void Debugger::OneTimeBreakAtEntry(const Function& target_function) {
InstrumentForStepping(target_function);
}
SourceBreakpoint* Debugger::SetBreakpointAtEntry(
const Function& target_function) {
ASSERT(!target_function.IsNull());
return SetBreakpoint(target_function,
target_function.token_pos(),
target_function.end_token_pos());
}
SourceBreakpoint* Debugger::SetBreakpointAtLine(const String& script_url,
intptr_t line_number) {
Library& lib = Library::Handle(isolate_);
Script& script = Script::Handle(isolate_);
const GrowableObjectArray& libs =
GrowableObjectArray::Handle(isolate_->object_store()->libraries());
for (int i = 0; i < libs.Length(); i++) {
lib ^= libs.At(i);
script = lib.LookupScript(script_url);
if (!script.IsNull()) {
break;
}
}
if (script.IsNull()) {
if (FLAG_verbose_debug) {
OS::Print("Failed to find script with url '%s'\n",
script_url.ToCString());
}
return NULL;
}
intptr_t first_token_idx, last_token_idx;
script.TokenRangeAtLine(line_number, &first_token_idx, &last_token_idx);
if (first_token_idx < 0) {
// Script does not contain the given line number.
if (FLAG_verbose_debug) {
OS::Print("Script '%s' does not contain line number %"Pd"\n",
script_url.ToCString(), line_number);
}
return NULL;
} else if (last_token_idx < 0) {
// Line does not contain any tokens. first_token_index is the first
// token after the given line. We check whether that token is
// part of a function.
last_token_idx = first_token_idx;
}
Function& func = Function::Handle(isolate_);
while (first_token_idx <= last_token_idx) {
func = lib.LookupFunctionInScript(script, first_token_idx);
if (!func.IsNull()) {
break;
}
first_token_idx++;
}
if (func.IsNull()) {
if (FLAG_verbose_debug) {
OS::Print("No executable code at line %"Pd" in '%s'\n",
line_number, script_url.ToCString());
}
return NULL;
}
if (last_token_idx < 0) {
// The token at first_token_index is past the requested source line.
// Set the breakpoint at the closest position after that line.
last_token_idx = func.end_token_pos();
}
return SetBreakpoint(func, first_token_idx, last_token_idx);
}
intptr_t Debugger::CacheObject(const Object& obj) {
ASSERT(obj_cache_ != NULL);
return obj_cache_->AddObject(obj);
}
bool Debugger::IsValidObjectId(intptr_t obj_id) {
ASSERT(obj_cache_ != NULL);
return obj_cache_->IsValidId(obj_id);
}
RawObject* Debugger::GetCachedObject(intptr_t obj_id) {
ASSERT(obj_cache_ != NULL);
return obj_cache_->GetObj(obj_id);
}
// TODO(hausner): Merge some of this functionality with the code in
// dart_api_impl.cc.
RawObject* Debugger::GetInstanceField(const Class& cls,
const String& field_name,
const Instance& object) {
const Function& getter_func =
Function::Handle(cls.LookupGetterFunction(field_name));
ASSERT(!getter_func.IsNull());
Object& result = Object::Handle();
LongJump* base = isolate_->long_jump_base();
LongJump jump;
isolate_->set_long_jump_base(&jump);
bool saved_ignore_flag = ignore_breakpoints_;
ignore_breakpoints_ = true;
if (setjmp(*jump.Set()) == 0) {
const Array& args = Array::Handle(Array::New(1));
args.SetAt(0, object);
result = DartEntry::InvokeFunction(getter_func, args);
} else {
result = isolate_->object_store()->sticky_error();
}
ignore_breakpoints_ = saved_ignore_flag;
isolate_->set_long_jump_base(base);
return result.raw();
}
RawObject* Debugger::GetStaticField(const Class& cls,
const String& field_name) {
const Field& fld = Field::Handle(cls.LookupStaticField(field_name));
if (!fld.IsNull()) {
// Return the value in the field if it has been initialized already.
const Instance& value = Instance::Handle(fld.value());
ASSERT(value.raw() != Object::transition_sentinel().raw());
if (value.raw() != Object::sentinel().raw()) {
return value.raw();
}
}
// There is no field or the field has not been initialized yet.
// We must have a getter. Run the getter.
const Function& getter_func =
Function::Handle(cls.LookupGetterFunction(field_name));
ASSERT(!getter_func.IsNull());
if (getter_func.IsNull()) {
return Object::null();
}
Object& result = Object::Handle();
LongJump* base = isolate_->long_jump_base();
LongJump jump;
isolate_->set_long_jump_base(&jump);
bool saved_ignore_flag = ignore_breakpoints_;
ignore_breakpoints_ = true;
if (setjmp(*jump.Set()) == 0) {
result = DartEntry::InvokeFunction(getter_func, Object::empty_array());
} else {
result = isolate_->object_store()->sticky_error();
}
ignore_breakpoints_ = saved_ignore_flag;
isolate_->set_long_jump_base(base);
return result.raw();
}
RawArray* Debugger::GetInstanceFields(const Instance& obj) {
Class& cls = Class::Handle(obj.clazz());
Array& fields = Array::Handle();
Field& field = Field::Handle();
const GrowableObjectArray& field_list =
GrowableObjectArray::Handle(GrowableObjectArray::New(8));
String& field_name = String::Handle();
Object& field_value = Object::Handle();
// Iterate over fields in class hierarchy to count all instance fields.
while (!cls.IsNull()) {
fields = cls.fields();
for (int i = 0; i < fields.Length(); i++) {
field ^= fields.At(i);
if (!field.is_static()) {
field_name = field.name();
field_list.Add(field_name);
field_value = GetInstanceField(cls, field_name, obj);
field_list.Add(field_value);
}
}
cls = cls.SuperClass();
}
return Array::MakeArray(field_list);
}
RawArray* Debugger::GetStaticFields(const Class& cls) {
const GrowableObjectArray& field_list =
GrowableObjectArray::Handle(GrowableObjectArray::New(8));
Array& fields = Array::Handle(cls.fields());
Field& field = Field::Handle();
String& field_name = String::Handle();
Object& field_value = Object::Handle();
for (int i = 0; i < fields.Length(); i++) {
field ^= fields.At(i);
if (field.is_static()) {
field_name = field.name();
field_value = GetStaticField(cls, field_name);
field_list.Add(field_name);
field_list.Add(field_value);
}
}
return Array::MakeArray(field_list);
}
void Debugger::CollectLibraryFields(const GrowableObjectArray& field_list,
const Library& lib,
const String& prefix,
bool include_private_fields) {
DictionaryIterator it(lib);
Object& entry = Object::Handle(isolate_);
Field& field = Field::Handle(isolate_);
Class& cls = Class::Handle(isolate_);
String& field_name = String::Handle(isolate_);
Object& field_value = Object::Handle(isolate_);
while (it.HasNext()) {
entry = it.GetNext();
if (entry.IsField()) {
field ^= entry.raw();
cls = field.owner();
ASSERT(field.is_static());
field_name = field.name();
if ((field_name.CharAt(0) == '_') && !include_private_fields) {
// Skip library-private field.
continue;
}
field_value = GetStaticField(cls, field_name);
if (!prefix.IsNull()) {
field_name = String::Concat(prefix, field_name);
}
field_list.Add(field_name);
field_list.Add(field_value);
}
}
}
RawArray* Debugger::GetLibraryFields(const Library& lib) {
const GrowableObjectArray& field_list =
GrowableObjectArray::Handle(GrowableObjectArray::New(8));
CollectLibraryFields(field_list, lib, String::Handle(isolate_), true);
return Array::MakeArray(field_list);
}
RawArray* Debugger::GetGlobalFields(const Library& lib) {
const GrowableObjectArray& field_list =
GrowableObjectArray::Handle(GrowableObjectArray::New(8));
String& prefix_name = String::Handle(isolate_);
CollectLibraryFields(field_list, lib, prefix_name, true);
Library& imported = Library::Handle(isolate_);
intptr_t num_imports = lib.num_imports();
for (int i = 0; i < num_imports; i++) {
imported = lib.ImportLibraryAt(i);
ASSERT(!imported.IsNull());
CollectLibraryFields(field_list, imported, prefix_name, false);
}
LibraryPrefix& prefix = LibraryPrefix::Handle(isolate_);
LibraryPrefixIterator it(lib);
while (it.HasNext()) {
prefix = it.GetNext();
prefix_name = prefix.name();
ASSERT(!prefix_name.IsNull());
prefix_name = String::Concat(prefix_name, Symbols::Dot());
for (int i = 0; i < prefix.num_imports(); i++) {
imported = prefix.GetLibrary(i);
CollectLibraryFields(field_list, imported, prefix_name, false);
}
}
return Array::MakeArray(field_list);
}
void Debugger::VisitObjectPointers(ObjectPointerVisitor* visitor) {
ASSERT(visitor != NULL);
SourceBreakpoint* bpt = src_breakpoints_;
while (bpt != NULL) {
bpt->VisitObjectPointers(visitor);
bpt = bpt->next();
}
CodeBreakpoint* cbpt = code_breakpoints_;
while (cbpt != NULL) {
cbpt->VisitObjectPointers(visitor);
cbpt = cbpt->next();
}
}
void Debugger::SetEventHandler(EventHandler* handler) {
event_handler_ = handler;
}
bool Debugger::IsDebuggable(const Function& func) {
RawFunction::Kind fkind = func.kind();
if ((fkind == RawFunction::kImplicitGetter) ||
(fkind == RawFunction::kImplicitSetter) ||
(fkind == RawFunction::kConstImplicitGetter) ||
(fkind == RawFunction::kMethodExtractor) ||
(fkind == RawFunction::kNoSuchMethodDispatcher)) {
return false;
}
const Class& cls = Class::Handle(func.Owner());
const Library& lib = Library::Handle(cls.library());
return lib.IsDebuggable();
}
void Debugger::SignalPausedEvent(ActivationFrame* top_frame) {
resume_action_ = kContinue;
isolate_->set_single_step(false);
ASSERT(!in_event_notification_);
ASSERT(obj_cache_ == NULL);
in_event_notification_ = true;
obj_cache_ = new RemoteObjectCache(64);
DebuggerEvent event;
event.type = kBreakpointReached;
event.top_frame = top_frame;
(*event_handler_)(&event);
in_event_notification_ = false;
obj_cache_ = NULL; // Remote object cache is zone allocated.
}
void Debugger::SingleStepCallback() {
ASSERT(resume_action_ == kSingleStep);
ASSERT(isolate_->single_step());
// We can't get here unless the debugger event handler enabled
// single stepping.
ASSERT(event_handler_ != NULL);
// Don't pause recursively.
if (in_event_notification_) return;
// Check whether we are in a Dart function that the user is
// interested in.
ActivationFrame* frame = TopDartFrame();
ASSERT(frame != NULL);
const Function& func = frame->function();
if (!IsDebuggable(func)) {
return;
}
if (FLAG_verbose_debug) {
OS::Print(">>> single step break at %s:%"Pd" (func %s token %"Pd")\n",
String::Handle(frame->SourceUrl()).ToCString(),
frame->LineNumber(),
String::Handle(frame->QualifiedFunctionName()).ToCString(),
frame->TokenPos());
}
stack_trace_ = CollectStackTrace();
SignalPausedEvent(frame);
RemoveInternalBreakpoints();
if (resume_action_ == kStepOver) {
InstrumentForStepping(func);
} else if (resume_action_ == kStepOut) {
if (stack_trace_->Length() > 1) {
ActivationFrame* caller_frame = stack_trace_->ActivationFrameAt(1);
InstrumentForStepping(caller_frame->function());
}
}
stack_trace_ = NULL;
}
void Debugger::SignalBpReached() {
// We ignore this breakpoint when the VM is executing code invoked
// by the debugger to evaluate variables values, or when we see a nested
// breakpoint or exception event.
if (ignore_breakpoints_ || in_event_notification_) {
return;
}
DebuggerStackTrace* stack_trace = CollectStackTrace();
ASSERT(stack_trace->Length() > 0);
ActivationFrame* top_frame = stack_trace->ActivationFrameAt(0);
ASSERT(top_frame != NULL);
CodeBreakpoint* bpt = GetCodeBreakpoint(top_frame->pc());
ASSERT(bpt != NULL);
bool report_bp = true;
if (bpt->IsInternal() && !IsDebuggable(top_frame->function())) {
report_bp = false;
}
if (FLAG_verbose_debug) {
OS::Print(">>> %s %s breakpoint at %s:%"Pd" "
"(token %"Pd") (address %#"Px")\n",
report_bp ? "hit" : "ignore",
bpt->IsInternal() ? "internal" : "user",
String::Handle(bpt->SourceUrl()).ToCString(),
bpt->LineNumber(),
bpt->token_pos(),
top_frame->pc());
}
if (report_bp && (event_handler_ != NULL)) {
stack_trace_ = stack_trace;
SignalPausedEvent(top_frame);
stack_trace_ = NULL;
}
Function& func_to_instrument = Function::Handle();
if (resume_action_ == kStepOver) {
if (bpt->breakpoint_kind_ == PcDescriptors::kReturn) {
// Step over return is converted into a single step so we break at
// the caller.
SetSingleStep();
} else {
func_to_instrument = bpt->function();
}
} else if (resume_action_ == kStepOut) {
if (stack_trace->Length() > 1) {
ActivationFrame* caller_frame = stack_trace->ActivationFrameAt(1);
func_to_instrument = caller_frame->function().raw();
}
} else {
ASSERT((resume_action_ == kContinue) || (resume_action_ == kSingleStep));
// Nothing to do here. Any potential instrumentation will be removed
// below. Single stepping is handled by the single step callback.
}
if (func_to_instrument.IsNull() ||
(func_to_instrument.raw() != bpt->function())) {
RemoveInternalBreakpoints(); // *bpt is now invalid.
if (!func_to_instrument.IsNull()) {
InstrumentForStepping(func_to_instrument);
}
}
}
void Debugger::Initialize(Isolate* isolate) {
if (initialized_) {
return;
}
isolate_ = isolate;
// Create a port here, we don't expect to receive any messages on this port.
// This port will be used as a unique ID to represet the isolate in the
// debugger wire protocol messages.
// NOTE: SetLive is never called on this port.
isolate_id_ = PortMap::CreatePort(isolate->message_handler());
initialized_ = true;
// Signal isolate creation event.
SignalIsolateEvent(Debugger::kIsolateCreated);
}
void Debugger::NotifyCompilation(const Function& func) {
if (src_breakpoints_ == NULL) {
// Return with minimal overhead if there are no breakpoints.
return;
}
Function& lookup_function = Function::Handle(func.raw());
if (func.IsImplicitClosureFunction()) {
// If the newly compiled function is a an implicit closure (a closure that
// was formed by assigning a static or instance method to a function
// object), we need to use the closure's parent function to see whether
// there are any breakpoints. The parent function is the actual method on
// which the user sets breakpoints.
lookup_function = func.parent_function();
ASSERT(!lookup_function.IsNull());
}
SourceBreakpoint* bpt = src_breakpoints_;
while (bpt != NULL) {
if (lookup_function.raw() == bpt->function()) {
// Check if the breakpoint is inside a closure or local function
// within the newly compiled function.
Class& owner = Class::Handle(lookup_function.Owner());
Function& closure =
Function::Handle(owner.LookupClosureFunction(bpt->token_pos()));
if (!closure.IsNull() && (closure.raw() != lookup_function.raw())) {
if (FLAG_verbose_debug) {
OS::Print("Resetting pending breakpoint to function %s\n",
closure.ToFullyQualifiedCString());
}
bpt->set_function(closure);
} else {
if (FLAG_verbose_debug) {
OS::Print("Enable pending breakpoint for function '%s'\n",
String::Handle(lookup_function.name()).ToCString());
}
const Script& script= Script::Handle(func.script());
intptr_t first_pos, last_pos;
script.TokenRangeAtLine(bpt->LineNumber(), &first_pos, &last_pos);
intptr_t bp_pos =
ResolveBreakpointPos(func, bpt->token_pos(), last_pos);
bpt->set_token_pos(bp_pos);
MakeCodeBreakpointsAt(func, bp_pos, bpt);
SignalBpResolved(bpt);
}
bpt->Enable(); // Enables the code breakpoint as well.
}
bpt = bpt->next();
}
}
CodeBreakpoint* Debugger::GetCodeBreakpoint(uword breakpoint_address) {
CodeBreakpoint* bpt = code_breakpoints_;
while (bpt != NULL) {
if (bpt->pc() == breakpoint_address) {
return bpt;
}
bpt = bpt->next();
}
return NULL;
}
uword Debugger::GetPatchedStubAddress(uword breakpoint_address) {
CodeBreakpoint* bpt = GetCodeBreakpoint(breakpoint_address);
if (bpt != NULL) {
return bpt->saved_bytes_.target_address_;
}
UNREACHABLE();
return 0L;
}
// Remove and delete the source breakpoint bpt and its associated
// code breakpoints.
void Debugger::RemoveBreakpoint(intptr_t bp_id) {
SourceBreakpoint* prev_bpt = NULL;
SourceBreakpoint* curr_bpt = src_breakpoints_;
while (curr_bpt != NULL) {
if (curr_bpt->id() == bp_id) {
if (prev_bpt == NULL) {
src_breakpoints_ = src_breakpoints_->next();
} else {
prev_bpt->set_next(curr_bpt->next());
}
// Remove references from code breakpoints to this source breakpoint,
// and disable the code breakpoints.
UnlinkCodeBreakpoints(curr_bpt);
delete curr_bpt;
return;
}
prev_bpt = curr_bpt;
curr_bpt = curr_bpt->next();
}
// bpt is not a registered breakpoint, nothing to do.
}
// Turn code breakpoints associated with the given source breakpoint into
// internal breakpoints. They will later be deleted when control
// returns from the user-defined breakpoint callback. Also, disable the
// breakpoint so it no longer fires if it should be hit before it gets
// deleted.
void Debugger::UnlinkCodeBreakpoints(SourceBreakpoint* src_bpt) {
ASSERT(src_bpt != NULL);
CodeBreakpoint* curr_bpt = code_breakpoints_;
while (curr_bpt != NULL) {
if (curr_bpt->src_bpt() == src_bpt) {
curr_bpt->Disable();
curr_bpt->set_src_bpt(NULL);
}
curr_bpt = curr_bpt->next();
}
}
// Remove and delete internal breakpoints, i.e. breakpoints that
// are not associated with a source breakpoint.
void Debugger::RemoveInternalBreakpoints() {
CodeBreakpoint* prev_bpt = NULL;
CodeBreakpoint* curr_bpt = code_breakpoints_;
while (curr_bpt != NULL) {
if (curr_bpt->src_bpt() == NULL) {
if (prev_bpt == NULL) {
code_breakpoints_ = code_breakpoints_->next();
} else {
prev_bpt->set_next(curr_bpt->next());
}
CodeBreakpoint* temp_bpt = curr_bpt;
curr_bpt = curr_bpt->next();
temp_bpt->Disable();
delete temp_bpt;
} else {
prev_bpt = curr_bpt;
curr_bpt = curr_bpt->next();
}
}
}
SourceBreakpoint* Debugger::GetSourceBreakpoint(const Function& func,
intptr_t token_pos) {
SourceBreakpoint* bpt = src_breakpoints_;
while (bpt != NULL) {
if ((bpt->function() == func.raw()) &&
(bpt->token_pos() == token_pos)) {
return bpt;
}
bpt = bpt->next();
}
return NULL;
}
SourceBreakpoint* Debugger::GetBreakpointById(intptr_t id) {
SourceBreakpoint* bpt = src_breakpoints_;
while (bpt != NULL) {
if (bpt->id() == id) {
return bpt;
}
bpt = bpt->next();
}
return NULL;
}
void Debugger::RegisterSourceBreakpoint(SourceBreakpoint* bpt) {
ASSERT(bpt->next() == NULL);
bpt->set_next(src_breakpoints_);
src_breakpoints_ = bpt;
}
void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
ASSERT(bpt->next() == NULL);
bpt->set_next(code_breakpoints_);
code_breakpoints_ = bpt;
}
} // namespace dart
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