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/**
* Copyright 2015 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "debugger.h"
#include <cstdint>
#include <memory>
#include "jni_utils.h"
#include "jvm_breakpoint.h"
#include "jvm_breakpoints_manager.h"
#include "safe_method_caller.h"
#include "statistician.h"
#include "stopwatch.h"
ABSL_FLAG(int32, cdbg_class_files_cache_size,
1024 * 1024, // 1 MB.
"Cache size for class files used in safe method caller");
namespace devtools {
namespace cdbg {
Debugger::Debugger(
Scheduler<>* scheduler, Config* config, EvalCallStack* eval_call_stack,
std::unique_ptr<MethodLocals> method_locals,
std::unique_ptr<ClassMetadataReader> class_metadata_reader,
std::unique_ptr<StatusMessageModel> setup_error,
ClassPathLookup* class_path_lookup,
std::unique_ptr<DynamicLogger> dynamic_logger,
std::function<std::unique_ptr<BreakpointLabelsProvider>()> labels_factory,
std::function<std::unique_ptr<UserIdProvider>()> user_id_provider_factory,
FormatQueue* format_queue, CanaryControl* canary_control /* = nullptr */)
: config_(config),
eval_call_stack_(eval_call_stack),
method_locals_(std::move(method_locals)),
class_metadata_reader_(std::move(class_metadata_reader)),
setup_error_(std::move(setup_error)),
object_evaluator_(class_metadata_reader_.get()),
class_files_cache_(&class_indexer_,
absl::GetFlag(FLAGS_cdbg_class_files_cache_size)),
dynamic_logger_(std::move(dynamic_logger)) {
evaluators_.class_path_lookup = class_path_lookup;
evaluators_.class_indexer = &class_indexer_;
evaluators_.eval_call_stack = eval_call_stack_;
evaluators_.method_locals = method_locals_.get();
evaluators_.class_metadata_reader = class_metadata_reader_.get();
evaluators_.object_evaluator = &object_evaluator_;
evaluators_.method_caller_factory = [this](Config::MethodCallQuotaType type) {
return std::unique_ptr<MethodCaller>(new SafeMethodCaller(
config_,
config_->GetQuota(type),
&class_indexer_,
&class_files_cache_));
};
evaluators_.labels_factory = std::move(labels_factory);
evaluators_.user_id_provider_factory = std::move(user_id_provider_factory);
auto factory = [this, scheduler, format_queue](
BreakpointsManager* breakpoints_manager,
std::unique_ptr<BreakpointModel> breakpoint_definition) {
return std::make_shared<JvmBreakpoint>(
scheduler,
&evaluators_,
format_queue,
dynamic_logger_.get(),
breakpoints_manager,
CopySetupError(),
std::move(breakpoint_definition));
};
breakpoints_manager_.reset(new JvmBreakpointsManager(
factory,
&evaluators_,
format_queue,
canary_control));
}
Debugger::~Debugger() {
breakpoints_manager_->Cleanup();
class_indexer_.Cleanup();
}
void Debugger::Initialize() {
Stopwatch stopwatch;
LOG(INFO) << "Initializing Java debuglet";
// Get the set of already loaded classes. Other classes will be indexed
// as they get loaded by JVM.
class_indexer_.Initialize();
// Initialize pretty printers.
object_evaluator_.Initialize();
LOG(INFO) << "Debugger::Initialize initialization time: "
<< stopwatch.GetElapsedMillis() << " ms";
}
std::unique_ptr<StatusMessageModel> Debugger::CopySetupError() {
return setup_error_ == nullptr ?
nullptr :
StatusMessageBuilder(*setup_error_).build();
}
void Debugger::JvmtiOnClassPrepare(jthread thread, jclass cls) {
// Log the accumulated time. "OnClassPrepare" handler is a tax we are
// paying upfront whether debugger is used or not. It is therefore very
// important to keep this function fast.
ScopedStat ss(statClassPrepareTime);
// Index the new class.
class_indexer_.JvmtiOnClassPrepare(cls);
}
// Note: JNIEnv* is not available through jni() call.
void Debugger::JvmtiOnCompiledMethodUnload(
jmethodID method,
const void* code_addr) {
eval_call_stack_->JvmtiOnCompiledMethodUnload(method);
method_locals_->JvmtiOnCompiledMethodUnload(method);
breakpoints_manager_->JvmtiOnCompiledMethodUnload(method);
}
void Debugger::JvmtiOnBreakpoint(
jthread thread,
jmethodID method,
jlocation location) {
breakpoints_manager_->JvmtiOnBreakpoint(thread, method, location);
}
void Debugger::SetActiveBreakpointsList(
std::vector<std::unique_ptr<BreakpointModel>> breakpoints) {
breakpoints_manager_->SetActiveBreakpointsList(std::move(breakpoints));
}
} // namespace cdbg
} // namespace devtools