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a50b019f35207c602afb144f31dfd04ea29d0485
sdk/runtime/vm/debugger.cc
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regis@google.com 8c44be4313 Add support for object pool that will be used on ARM and MIPS architectures. 
Modify code patching infrastructure to accept code object, which is necessary to
get to the object pool containing patchable target addresses.
Modify assembler test infrastructure to provide associated code object.
Review URL: https://codereview.chromium.org//12260026

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18604 260f80e4-7a28-3924-810f-c04153c831b5
2013-02-15 23:55:31 +00:00

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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");
static void DefaultBreakpointHandler(Dart_Port isolate_id,
SourceBreakpoint* bpt,
DebuggerStackTrace* stack) {
String& var_name = String::Handle();
Instance& value = Instance::Handle();
for (intptr_t i = 0; i < stack->Length(); i++) {
ActivationFrame* frame = stack->ActivationFrameAt(i);
OS::Print(" %"Pd". %s\n",
i + 1, frame->ToCString());
intptr_t num_locals = frame->NumLocalVariables();
for (intptr_t i = 0; i < num_locals; i++) {
intptr_t token_pos, end_pos;
frame->VariableAt(i, &var_name, &token_pos, &end_pos, &value);
OS::Print(" var %s (pos %"Pd") = %s\n",
var_name.ToCString(), token_pos, value.ToCString());
}
}
}
BreakpointHandler* Debugger::bp_handler_ = DefaultBreakpointHandler;
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();
}
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;
}
}
ASSERT(token_pos_ >= 0);
}
return token_pos_;
}
intptr_t ActivationFrame::PcDescIndex() {
if (pc_desc_index_ < 0) {
TokenPos();
ASSERT(pc_desc_index_ >= 0);
}
return pc_desc_index_;
}
intptr_t ActivationFrame::TryIndex() {
intptr_t desc_index = PcDescIndex();
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) {
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) {
context_level_ = 0;
intptr_t pc_desc_idx = PcDescIndex();
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();
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_;
}
RawContext* ActivationFrame::GetSavedContext() {
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::kContextChain) {
return reinterpret_cast<RawContext*>(GetLocalVarValue(var_info.index));
}
}
UNREACHABLE();
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;
}
GrowableArray<String*> var_names(8);
intptr_t activation_token_pos = TokenPos();
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);
ASSERT(!ctx_.IsNull());
// The context level at the PC/token index of this activation frame.
intptr_t frame_ctx_level = ContextLevel();
// 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);
}
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((breakpoint_kind_ == PcDescriptors::kIcCall) ||
(breakpoint_kind_ == PcDescriptors::kFuncCall) ||
(breakpoint_kind_ == PcDescriptors::kReturn));
}
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, NULL);
CodePatcher::PatchInstanceCallAt(pc_, code,
StubCode::BreakpointDynamicEntryPoint());
break;
}
case PcDescriptors::kFuncCall: {
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::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::kFuncCall: {
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),
last_bpt_line_(-1),
ignore_breakpoints_(false),
exc_pause_info_(kNoPauseOnExceptions) {
}
Debugger::~Debugger() {
PortMap::ClosePort(isolate_id_);
isolate_id_ = ILLEGAL_ISOLATE_ID;
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();
}
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.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;
}
PcDescriptors::Kind kind = desc.DescriptorKind(i);
if ((kind == PcDescriptors::kIcCall) ||
(kind == PcDescriptors::kFuncCall) ||
(kind == PcDescriptors::kReturn)) {
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();
bool get_saved_context = 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 (get_saved_context) {
ctx = activation->GetSavedContext();
}
activation->SetContext(ctx);
stack_trace->AddActivation(activation);
get_saved_context = activation->function().IsClosureFunction();
} else if (frame->IsEntryFrame()) {
ctx = reinterpret_cast<EntryFrame*>(frame)->SavedContext();
get_saved_context = false;
}
frame = iterator.NextFrame();
}
return stack_trace;
}
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 (Dart_ExceptionPauseInfo)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_ ||
(stack_trace_ != NULL) ||
(event_handler_ == NULL) ||
(exc_pause_info_ == kNoPauseOnExceptions)) {
return;
}
DebuggerStackTrace* stack_trace = CollectStackTrace();
if (!ShouldPauseOnException(stack_trace, exc)) {
return;
}
// No single-stepping possible after this pause event.
last_bpt_line_ = -1;
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;
ASSERT(event_handler_ != NULL);
(*event_handler_)(&event);
stack_trace_ = NULL;
obj_cache_ = NULL; // Remote object cache is zone allocated.
}
CodeBreakpoint* Debugger::MakeCodeBreakpoint(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());
// We attempt to find the PC descriptor that is closest to the
// beginning of the token range, in terms of native code address. If we
// don't find a PC descriptor within the given range, we pick the
// nearest one to the beginning of the range, in terms of token position.
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);
if (desc_token_pos < first_token_pos) {
continue;
}
PcDescriptors::Kind kind = desc.DescriptorKind(i);
if ((kind == PcDescriptors::kIcCall) ||
(kind == PcDescriptors::kFuncCall) ||
(kind == PcDescriptors::kReturn)) {
if ((desc_token_pos - first_token_pos) < best_fit) {
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)) {
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) {
CodeBreakpoint* bpt = GetCodeBreakpoint(desc.PC(best_fit_index));
// We should only ever have one code breakpoint at the same address.
if (bpt != NULL) {
return bpt;
}
bpt = new CodeBreakpoint(func, best_fit_index);
if (FLAG_verbose_debug) {
OS::Print("Setting breakpoint in function '%s' "
"(%s:%"Pd") (Token %"Pd") (PC %#"Px")\n",
String::Handle(func.name()).ToCString(),
String::Handle(bpt->SourceUrl()).ToCString(),
bpt->LineNumber(),
bpt->token_pos(),
bpt->pc());
}
RegisterCodeBreakpoint(bpt);
return bpt;
}
return NULL;
}
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;
}
DeoptimizeWorld();
ASSERT(!target_function.HasOptimizedCode());
CodeBreakpoint* cbpt = NULL;
SourceBreakpoint* source_bpt = NULL;
if (target_function.HasCode()) {
cbpt = MakeCodeBreakpoint(target_function, first_token_pos, last_token_pos);
if (cbpt != NULL) {
if (cbpt->src_bpt() != NULL) {
// There is already a source breakpoint for the location.
ASSERT(cbpt->src_bpt() ==
GetSourceBreakpoint(target_function, cbpt->token_pos()));
return cbpt->src_bpt();
}
// No source breakpoint exists yet that is associated with the code
// breakpoint we found. (This is an internal breakpoint.) Adjust
// the breakpoint location to the actual position where breakpoint
// got set.
first_token_pos = cbpt->token_pos();
}
} else {
source_bpt = GetSourceBreakpoint(target_function, first_token_pos);
if (source_bpt != NULL) {
// A source breakpoint for this uncompiled location already
// exists.
return source_bpt;
}
}
source_bpt = new SourceBreakpoint(nextId(), target_function, first_token_pos);
RegisterSourceBreakpoint(source_bpt);
if (FLAG_verbose_debug && !target_function.HasCode()) {
OS::Print("Registering breakpoint for "
"uncompiled function '%s' at line %"Pd"\n",
target_function.ToFullyQualifiedCString(),
source_bpt->LineNumber());
}
if (cbpt != NULL) {
ASSERT(cbpt->src_bpt() == NULL);
cbpt->set_src_bpt(source_bpt);
SignalBpResolved(source_bpt);
} else {
if (FLAG_verbose_debug) {
OS::Print("Failed to set breakpoint at '%s' line %"Pd"\n",
String::Handle(source_bpt->SourceUrl()).ToCString(),
source_bpt->LineNumber());
}
}
if (target_function.HasImplicitClosureFunction()) {
// There is a closurized version of this function. If the closure
// is already compiled, we need to set a code breakpoint in its
// code.
const Function& closure =
Function::Handle(target_function.ImplicitClosureFunction());
if (closure.HasCode()) {
ASSERT(!closure.HasOptimizedCode());
CodeBreakpoint* closure_bpt =
MakeCodeBreakpoint(closure, first_token_pos, last_token_pos);
if ((closure_bpt != NULL) && (closure_bpt->src_bpt() == NULL)) {
closure_bpt->set_src_bpt(source_bpt);
}
}
}
source_bpt->Enable();
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();
Script& script = Script::Handle();
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;
}
const Function& func =
Function::Handle(lib.LookupFunctionInScript(script, 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::InvokeDynamic(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::InvokeStatic(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::SetBreakpointHandler(BreakpointHandler* handler) {
if (bp_handler_ != NULL) {
bp_handler_ = handler;
}
}
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)) {
return false;
}
const Class& cls = Class::Handle(func.Owner());
const Library& lib = Library::Handle(cls.library());
return lib.IsDebuggable();
}
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_ || (stack_trace_ != NULL)) {
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);
if (FLAG_verbose_debug) {
OS::Print(">>> hit %s breakpoint at %s:%"Pd" "
"(token %"Pd") (address %#"Px")\n",
bpt->IsInternal() ? "internal" : "user",
String::Handle(bpt->SourceUrl()).ToCString(),
bpt->LineNumber(),
bpt->token_pos(),
top_frame->pc());
}
if (!bpt->IsInternal()) {
// This is a user-defined breakpoint so we call the breakpoint
// callback even if it is on the same line as the previous breakpoint.
last_bpt_line_ = -1;
}
bool notify_frontend =
(last_bpt_line_ < 0) || (last_bpt_line_ != bpt->LineNumber());
if (notify_frontend) {
resume_action_ = kContinue;
if (bp_handler_ != NULL) {
SourceBreakpoint* src_bpt = bpt->src_bpt();
ASSERT(stack_trace_ == NULL);
ASSERT(obj_cache_ == NULL);
obj_cache_ = new RemoteObjectCache(64);
stack_trace_ = stack_trace;
(*bp_handler_)(GetIsolateId(), src_bpt, stack_trace);
stack_trace_ = NULL;
obj_cache_ = NULL; // Remote object cache is zone allocated.
last_bpt_line_ = bpt->LineNumber();
}
}
Function& currently_instrumented_func = Function::Handle();
if (bpt->IsInternal()) {
currently_instrumented_func = bpt->function();
}
Function& func_to_instrument = Function::Handle();
if (resume_action_ == kContinue) {
// Nothing to do here, any potential instrumentation will be removed
// below.
} else if (resume_action_ == kStepOver) {
func_to_instrument = bpt->function();
if (bpt->breakpoint_kind_ == PcDescriptors::kReturn) {
// If we are at the function return, do a StepOut action.
if (stack_trace->Length() > 1) {
ActivationFrame* caller_frame = stack_trace->ActivationFrameAt(1);
func_to_instrument = caller_frame->function().raw();
}
}
} else if (resume_action_ == kStepInto) {
// If the call target is not debuggable, we treat StepInto like
// a StepOver, that is we instrument the current function.
if (bpt->breakpoint_kind_ == PcDescriptors::kIcCall) {
func_to_instrument = bpt->function();
ICData& ic_data = ICData::Handle();
Array& descriptor = Array::Handle();
const Code& code =
Code::Handle(Function::Handle(bpt->function_).unoptimized_code());
CodePatcher::GetInstanceCallAt(bpt->pc_, code, &ic_data, &descriptor);
ArgumentsDescriptor arg_descriptor(descriptor);
ActivationFrame* top_frame = stack_trace->ActivationFrameAt(0);
intptr_t num_args = arg_descriptor.Count();
Instance& receiver =
Instance::Handle(top_frame->GetInstanceCallReceiver(num_args));
Code& target_code =
Code::Handle(ResolveCompileInstanceCallTarget(receiver,
ic_data,
descriptor));
if (!target_code.IsNull()) {
Function& callee = Function::Handle(target_code.function());
if (IsDebuggable(callee)) {
func_to_instrument = callee.raw();
}
}
} else if (bpt->breakpoint_kind_ == PcDescriptors::kFuncCall) {
func_to_instrument = bpt->function();
const Code& code = Code::Handle(func_to_instrument.CurrentCode());
const Function& callee =
Function::Handle(code.GetStaticCallTargetFunctionAt(bpt->pc_));
ASSERT(!callee.IsNull());
if (IsDebuggable(callee)) {
func_to_instrument = callee.raw();
}
} else {
ASSERT(bpt->breakpoint_kind_ == PcDescriptors::kReturn);
// Treat like stepping out to caller.
if (stack_trace->Length() > 1) {
ActivationFrame* caller_frame = stack_trace->ActivationFrameAt(1);
func_to_instrument = caller_frame->function().raw();
}
}
} else {
ASSERT(resume_action_ == kStepOut);
// Set stepping breakpoints in the caller.
if (stack_trace->Length() > 1) {
ActivationFrame* caller_frame = stack_trace->ActivationFrameAt(1);
func_to_instrument = caller_frame->function().raw();
}
}
if (func_to_instrument.IsNull() ||
(func_to_instrument.raw() != currently_instrumented_func.raw())) {
last_bpt_line_ = -1;
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());
}
// Set breakpoint in newly compiled code of function func.
CodeBreakpoint* cbpt =
MakeCodeBreakpoint(func, bpt->token_pos(), func.end_token_pos());
if (cbpt != NULL) {
cbpt->set_src_bpt(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;
}
// Remove and delete the source breakpoint bpt and its associated
// code breakpoints.
void Debugger::RemoveBreakpoint(intptr_t bp_id) {
ASSERT(src_breakpoints_ != NULL);
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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