/*
* Copyright 2014 The Android Open Source Project
*
* 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 "jit.h"
#include <dlfcn.h>
#include "art_method-inl.h"
#include "base/enums.h"
#include "base/logging.h" // For VLOG.
#include "base/memory_tool.h"
#include "base/runtime_debug.h"
#include "base/utils.h"
#include "debugger.h"
#include "entrypoints/runtime_asm_entrypoints.h"
#include "interpreter/interpreter.h"
#include "java_vm_ext.h"
#include "jit_code_cache.h"
#include "oat_file_manager.h"
#include "oat_quick_method_header.h"
#include "profile_compilation_info.h"
#include "profile_saver.h"
#include "runtime.h"
#include "runtime_options.h"
#include "stack.h"
#include "stack_map.h"
#include "thread-inl.h"
#include "thread_list.h"
namespace art {
namespace jit {
static constexpr bool kEnableOnStackReplacement = true;
// At what priority to schedule jit threads. 9 is the lowest foreground priority on device.
static constexpr int kJitPoolThreadPthreadPriority = 9;
// Different compilation threshold constants. These can be overridden on the command line.
static constexpr size_t kJitDefaultCompileThreshold = 10000; // Non-debug default.
static constexpr size_t kJitStressDefaultCompileThreshold = 100; // Fast-debug build.
static constexpr size_t kJitSlowStressDefaultCompileThreshold = 2; // Slow-debug build.
// JIT compiler
void* Jit::jit_library_handle_ = nullptr;
void* Jit::jit_compiler_handle_ = nullptr;
void* (*Jit::jit_load_)(bool*) = nullptr;
void (*Jit::jit_unload_)(void*) = nullptr;
bool (*Jit::jit_compile_method_)(void*, ArtMethod*, Thread*, bool) = nullptr;
void (*Jit::jit_types_loaded_)(void*, mirror::Class**, size_t count) = nullptr;
bool Jit::generate_debug_info_ = false;
struct StressModeHelper {
DECLARE_RUNTIME_DEBUG_FLAG(kSlowMode);
};
DEFINE_RUNTIME_DEBUG_FLAG(StressModeHelper, kSlowMode);
JitOptions* JitOptions::CreateFromRuntimeArguments(const RuntimeArgumentMap& options) {
auto* jit_options = new JitOptions;
jit_options->use_jit_compilation_ = options.GetOrDefault(RuntimeArgumentMap::UseJitCompilation);
jit_options->code_cache_initial_capacity_ =
options.GetOrDefault(RuntimeArgumentMap::JITCodeCacheInitialCapacity);
jit_options->code_cache_max_capacity_ =
options.GetOrDefault(RuntimeArgumentMap::JITCodeCacheMaxCapacity);
jit_options->dump_info_on_shutdown_ =
options.Exists(RuntimeArgumentMap::DumpJITInfoOnShutdown);
jit_options->profile_saver_options_ =
options.GetOrDefault(RuntimeArgumentMap::ProfileSaverOpts);
if (options.Exists(RuntimeArgumentMap::JITCompileThreshold)) {
jit_options->compile_threshold_ = *options.Get(RuntimeArgumentMap::JITCompileThreshold);
} else {
jit_options->compile_threshold_ =
kIsDebugBuild
? (StressModeHelper::kSlowMode
? kJitSlowStressDefaultCompileThreshold
: kJitStressDefaultCompileThreshold)
: kJitDefaultCompileThreshold;
}
if (jit_options->compile_threshold_ > std::numeric_limits<uint16_t>::max()) {
LOG(FATAL) << "Method compilation threshold is above its internal limit.";
}
if (options.Exists(RuntimeArgumentMap::JITWarmupThreshold)) {
jit_options->warmup_threshold_ = *options.Get(RuntimeArgumentMap::JITWarmupThreshold);
if (jit_options->warmup_threshold_ > std::numeric_limits<uint16_t>::max()) {
LOG(FATAL) << "Method warmup threshold is above its internal limit.";
}
} else {
jit_options->warmup_threshold_ = jit_options->compile_threshold_ / 2;
}
if (options.Exists(RuntimeArgumentMap::JITOsrThreshold)) {
jit_options->osr_threshold_ = *options.Get(RuntimeArgumentMap::JITOsrThreshold);
if (jit_options->osr_threshold_ > std::numeric_limits<uint16_t>::max()) {
LOG(FATAL) << "Method on stack replacement threshold is above its internal limit.";
}
} else {
jit_options->osr_threshold_ = jit_options->compile_threshold_ * 2;
if (jit_options->osr_threshold_ > std::numeric_limits<uint16_t>::max()) {
jit_options->osr_threshold_ = std::numeric_limits<uint16_t>::max();
}
}
if (options.Exists(RuntimeArgumentMap::JITPriorityThreadWeight)) {
jit_options->priority_thread_weight_ =
*options.Get(RuntimeArgumentMap::JITPriorityThreadWeight);
if (jit_options->priority_thread_weight_ > jit_options->warmup_threshold_) {
LOG(FATAL) << "Priority thread weight is above the warmup threshold.";
} else if (jit_options->priority_thread_weight_ == 0) {
LOG(FATAL) << "Priority thread weight cannot be 0.";
}
} else {
jit_options->priority_thread_weight_ = std::max(
jit_options->warmup_threshold_ / Jit::kDefaultPriorityThreadWeightRatio,
static_cast<size_t>(1));
}
if (options.Exists(RuntimeArgumentMap::JITInvokeTransitionWeight)) {
jit_options->invoke_transition_weight_ =
*options.Get(RuntimeArgumentMap::JITInvokeTransitionWeight);
if (jit_options->invoke_transition_weight_ > jit_options->warmup_threshold_) {
LOG(FATAL) << "Invoke transition weight is above the warmup threshold.";
} else if (jit_options->invoke_transition_weight_ == 0) {
LOG(FATAL) << "Invoke transition weight cannot be 0.";
}
} else {
jit_options->invoke_transition_weight_ = std::max(
jit_options->warmup_threshold_ / Jit::kDefaultInvokeTransitionWeightRatio,
static_cast<size_t>(1));
}
return jit_options;
}
bool Jit::ShouldUsePriorityThreadWeight(Thread* self) {
return self->IsJitSensitiveThread() && Runtime::Current()->InJankPerceptibleProcessState();
}
void Jit::DumpInfo(std::ostream& os) {
code_cache_->Dump(os);
cumulative_timings_.Dump(os);
MutexLock mu(Thread::Current(), lock_);
memory_use_.PrintMemoryUse(os);
}
void Jit::DumpForSigQuit(std::ostream& os) {
DumpInfo(os);
ProfileSaver::DumpInstanceInfo(os);
}
void Jit::AddTimingLogger(const TimingLogger& logger) {
cumulative_timings_.AddLogger(logger);
}
Jit::Jit() : dump_info_on_shutdown_(false),
cumulative_timings_("JIT timings"),
memory_use_("Memory used for compilation", 16),
lock_("JIT memory use lock"),
use_jit_compilation_(true),
hot_method_threshold_(0),
warm_method_threshold_(0),
osr_method_threshold_(0),
priority_thread_weight_(0),
invoke_transition_weight_(0) {}
Jit* Jit::Create(JitOptions* options, std::string* error_msg) {
DCHECK(options->UseJitCompilation() || options->GetProfileSaverOptions().IsEnabled());
std::unique_ptr<Jit> jit(new Jit);
jit->dump_info_on_shutdown_ = options->DumpJitInfoOnShutdown();
if (jit_compiler_handle_ == nullptr && !LoadCompiler(error_msg)) {
return nullptr;
}
bool code_cache_only_for_profile_data = !options->UseJitCompilation();
jit->code_cache_.reset(JitCodeCache::Create(
options->GetCodeCacheInitialCapacity(),
options->GetCodeCacheMaxCapacity(),
jit->generate_debug_info_,
code_cache_only_for_profile_data,
error_msg));
if (jit->GetCodeCache() == nullptr) {
return nullptr;
}
jit->use_jit_compilation_ = options->UseJitCompilation();
jit->profile_saver_options_ = options->GetProfileSaverOptions();
VLOG(jit) << "JIT created with initial_capacity="
<< PrettySize(options->GetCodeCacheInitialCapacity())
<< ", max_capacity=" << PrettySize(options->GetCodeCacheMaxCapacity())
<< ", compile_threshold=" << options->GetCompileThreshold()
<< ", profile_saver_options=" << options->GetProfileSaverOptions();
jit->hot_method_threshold_ = options->GetCompileThreshold();
jit->warm_method_threshold_ = options->GetWarmupThreshold();
jit->osr_method_threshold_ = options->GetOsrThreshold();
jit->priority_thread_weight_ = options->GetPriorityThreadWeight();
jit->invoke_transition_weight_ = options->GetInvokeTransitionWeight();
jit->CreateThreadPool();
// Notify native debugger about the classes already loaded before the creation of the jit.
jit->DumpTypeInfoForLoadedTypes(Runtime::Current()->GetClassLinker());
return jit.release();
}
bool Jit::LoadCompilerLibrary(std::string* error_msg) {
jit_library_handle_ = dlopen(
kIsDebugBuild ? "libartd-compiler.so" : "libart-compiler.so", RTLD_NOW);
if (jit_library_handle_ == nullptr) {
std::ostringstream oss;
oss << "JIT could not load libart-compiler.so: " << dlerror();
*error_msg = oss.str();
return false;
}
jit_load_ = reinterpret_cast<void* (*)(bool*)>(dlsym(jit_library_handle_, "jit_load"));
if (jit_load_ == nullptr) {
dlclose(jit_library_handle_);
*error_msg = "JIT couldn't find jit_load entry point";
return false;
}
jit_unload_ = reinterpret_cast<void (*)(void*)>(
dlsym(jit_library_handle_, "jit_unload"));
if (jit_unload_ == nullptr) {
dlclose(jit_library_handle_);
*error_msg = "JIT couldn't find jit_unload entry point";
return false;
}
jit_compile_method_ = reinterpret_cast<bool (*)(void*, ArtMethod*, Thread*, bool)>(
dlsym(jit_library_handle_, "jit_compile_method"));
if (jit_compile_method_ == nullptr) {
dlclose(jit_library_handle_);
*error_msg = "JIT couldn't find jit_compile_method entry point";
return false;
}
jit_types_loaded_ = reinterpret_cast<void (*)(void*, mirror::Class**, size_t)>(
dlsym(jit_library_handle_, "jit_types_loaded"));
if (jit_types_loaded_ == nullptr) {
dlclose(jit_library_handle_);
*error_msg = "JIT couldn't find jit_types_loaded entry point";
return false;
}
return true;
}
bool Jit::LoadCompiler(std::string* error_msg) {
if (jit_library_handle_ == nullptr && !LoadCompilerLibrary(error_msg)) {
return false;
}
bool will_generate_debug_symbols = false;
VLOG(jit) << "Calling JitLoad interpreter_only="
<< Runtime::Current()->GetInstrumentation()->InterpretOnly();
jit_compiler_handle_ = (jit_load_)(&will_generate_debug_symbols);
if (jit_compiler_handle_ == nullptr) {
dlclose(jit_library_handle_);
*error_msg = "JIT couldn't load compiler";
return false;
}
generate_debug_info_ = will_generate_debug_symbols;
return true;
}
bool Jit::CompileMethod(ArtMethod* method, Thread* self, bool osr) {
DCHECK(Runtime::Current()->UseJitCompilation());
DCHECK(!method->IsRuntimeMethod());
RuntimeCallbacks* cb = Runtime::Current()->GetRuntimeCallbacks();
// Don't compile the method if it has breakpoints.
if (cb->IsMethodBeingInspected(method) && !cb->IsMethodSafeToJit(method)) {
VLOG(jit) << "JIT not compiling " << method->PrettyMethod()
<< " due to not being safe to jit according to runtime-callbacks. For example, there"
<< " could be breakpoints in this method.";
return false;
}
// Don't compile the method if we are supposed to be deoptimized.
instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation();
if (instrumentation->AreAllMethodsDeoptimized() || instrumentation->IsDeoptimized(method)) {
VLOG(jit) << "JIT not compiling " << method->PrettyMethod() << " due to deoptimization";
return false;
}
// If we get a request to compile a proxy method, we pass the actual Java method
// of that proxy method, as the compiler does not expect a proxy method.
ArtMethod* method_to_compile = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
if (!code_cache_->NotifyCompilationOf(method_to_compile, self, osr)) {
return false;
}
VLOG(jit) << "Compiling method "
<< ArtMethod::PrettyMethod(method_to_compile)
<< " osr=" << std::boolalpha << osr;
bool success = jit_compile_method_(jit_compiler_handle_, method_to_compile, self, osr);
code_cache_->DoneCompiling(method_to_compile, self, osr);
if (!success) {
VLOG(jit) << "Failed to compile method "
<< ArtMethod::PrettyMethod(method_to_compile)
<< " osr=" << std::boolalpha << osr;
}
if (kIsDebugBuild) {
if (self->IsExceptionPending()) {
mirror::Throwable* exception = self->GetException();
LOG(FATAL) << "No pending exception expected after compiling "
<< ArtMethod::PrettyMethod(method)
<< ": "
<< exception->Dump();
}
}
return success;
}
void Jit::CreateThreadPool() {
// There is a DCHECK in the 'AddSamples' method to ensure the tread pool
// is not null when we instrument.
// We need peers as we may report the JIT thread, e.g., in the debugger.
constexpr bool kJitPoolNeedsPeers = true;
thread_pool_.reset(new ThreadPool("Jit thread pool", 1, kJitPoolNeedsPeers));
thread_pool_->SetPthreadPriority(kJitPoolThreadPthreadPriority);
Start();
}
void Jit::DeleteThreadPool() {
Thread* self = Thread::Current();
DCHECK(Runtime::Current()->IsShuttingDown(self));
if (thread_pool_ != nullptr) {
std::unique_ptr<ThreadPool> pool;
{
ScopedSuspendAll ssa(__FUNCTION__);
// Clear thread_pool_ field while the threads are suspended.
// A mutator in the 'AddSamples' method will check against it.
pool = std::move(thread_pool_);
}
// When running sanitized, let all tasks finish to not leak. Otherwise just clear the queue.
if (!RUNNING_ON_MEMORY_TOOL) {
pool->StopWorkers(self);
pool->RemoveAllTasks(self);
}
// We could just suspend all threads, but we know those threads
// will finish in a short period, so it's not worth adding a suspend logic
// here. Besides, this is only done for shutdown.
pool->Wait(self, false, false);
}
}
void Jit::StartProfileSaver(const std::string& filename,
const std::vector<std::string>& code_paths) {
if (profile_saver_options_.IsEnabled()) {
ProfileSaver::Start(profile_saver_options_,
filename,
code_cache_.get(),
code_paths);
}
}
void Jit::StopProfileSaver() {
if (profile_saver_options_.IsEnabled() && ProfileSaver::IsStarted()) {
ProfileSaver::Stop(dump_info_on_shutdown_);
}
}
bool Jit::JitAtFirstUse() {
return HotMethodThreshold() == 0;
}
bool Jit::CanInvokeCompiledCode(ArtMethod* method) {
return code_cache_->ContainsPc(method->GetEntryPointFromQuickCompiledCode());
}
Jit::~Jit() {
DCHECK(!profile_saver_options_.IsEnabled() || !ProfileSaver::IsStarted());
if (dump_info_on_shutdown_) {
DumpInfo(LOG_STREAM(INFO));
Runtime::Current()->DumpDeoptimizations(LOG_STREAM(INFO));
}
DeleteThreadPool();
if (jit_compiler_handle_ != nullptr) {
jit_unload_(jit_compiler_handle_);
jit_compiler_handle_ = nullptr;
}
if (jit_library_handle_ != nullptr) {
dlclose(jit_library_handle_);
jit_library_handle_ = nullptr;
}
}
void Jit::NewTypeLoadedIfUsingJit(mirror::Class* type) {
if (!Runtime::Current()->UseJitCompilation()) {
// No need to notify if we only use the JIT to save profiles.
return;
}
jit::Jit* jit = Runtime::Current()->GetJit();
if (jit->generate_debug_info_) {
DCHECK(jit->jit_types_loaded_ != nullptr);
jit->jit_types_loaded_(jit->jit_compiler_handle_, &type, 1);
}
}
void Jit::DumpTypeInfoForLoadedTypes(ClassLinker* linker) {
struct CollectClasses : public ClassVisitor {
bool operator()(ObjPtr<mirror::Class> klass) OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_) {
classes_.push_back(klass.Ptr());
return true;
}
std::vector<mirror::Class*> classes_;
};
if (generate_debug_info_) {
ScopedObjectAccess so(Thread::Current());
CollectClasses visitor;
linker->VisitClasses(&visitor);
jit_types_loaded_(jit_compiler_handle_, visitor.classes_.data(), visitor.classes_.size());
}
}
extern "C" void art_quick_osr_stub(void** stack,
uint32_t stack_size_in_bytes,
const uint8_t* native_pc,
JValue* result,
const char* shorty,
Thread* self);
bool Jit::MaybeDoOnStackReplacement(Thread* thread,
ArtMethod* method,
uint32_t dex_pc,
int32_t dex_pc_offset,
JValue* result) {
if (!kEnableOnStackReplacement) {
return false;
}
Jit* jit = Runtime::Current()->GetJit();
if (jit == nullptr) {
return false;
}
if (UNLIKELY(__builtin_frame_address(0) < thread->GetStackEnd())) {
// Don't attempt to do an OSR if we are close to the stack limit. Since
// the interpreter frames are still on stack, OSR has the potential
// to stack overflow even for a simple loop.
// b/27094810.
return false;
}
// Get the actual Java method if this method is from a proxy class. The compiler
// and the JIT code cache do not expect methods from proxy classes.
method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
// Cheap check if the method has been compiled already. That's an indicator that we should
// osr into it.
if (!jit->GetCodeCache()->ContainsPc(method->GetEntryPointFromQuickCompiledCode())) {
return false;
}
// Fetch some data before looking up for an OSR method. We don't want thread
// suspension once we hold an OSR method, as the JIT code cache could delete the OSR
// method while we are being suspended.
CodeItemDataAccessor accessor(method->DexInstructionData());
const size_t number_of_vregs = accessor.RegistersSize();
const char* shorty = method->GetShorty();
std::string method_name(VLOG_IS_ON(jit) ? method->PrettyMethod() : "");
void** memory = nullptr;
size_t frame_size = 0;
ShadowFrame* shadow_frame = nullptr;
const uint8_t* native_pc = nullptr;
{
ScopedAssertNoThreadSuspension sts("Holding OSR method");
const OatQuickMethodHeader* osr_method = jit->GetCodeCache()->LookupOsrMethodHeader(method);
if (osr_method == nullptr) {
// No osr method yet, just return to the interpreter.
return false;
}
CodeInfo code_info = osr_method->GetOptimizedCodeInfo();
CodeInfoEncoding encoding = code_info.ExtractEncoding();
// Find stack map starting at the target dex_pc.
StackMap stack_map = code_info.GetOsrStackMapForDexPc(dex_pc + dex_pc_offset, encoding);
if (!stack_map.IsValid()) {
// There is no OSR stack map for this dex pc offset. Just return to the interpreter in the
// hope that the next branch has one.
return false;
}
// Before allowing the jump, make sure no code is actively inspecting the method to avoid
// jumping from interpreter to OSR while e.g. single stepping. Note that we could selectively
// disable OSR when single stepping, but that's currently hard to know at this point.
if (Runtime::Current()->GetRuntimeCallbacks()->IsMethodBeingInspected(method)) {
return false;
}
// We found a stack map, now fill the frame with dex register values from the interpreter's
// shadow frame.
DexRegisterMap vreg_map =
code_info.GetDexRegisterMapOf(stack_map, encoding, number_of_vregs);
frame_size = osr_method->GetFrameSizeInBytes();
// Allocate memory to put shadow frame values. The osr stub will copy that memory to
// stack.
// Note that we could pass the shadow frame to the stub, and let it copy the values there,
// but that is engineering complexity not worth the effort for something like OSR.
memory = reinterpret_cast<void**>(malloc(frame_size));
CHECK(memory != nullptr);
memset(memory, 0, frame_size);
// Art ABI: ArtMethod is at the bottom of the stack.
memory[0] = method;
shadow_frame = thread->PopShadowFrame();
if (!vreg_map.IsValid()) {
// If we don't have a dex register map, then there are no live dex registers at
// this dex pc.
} else {
for (uint16_t vreg = 0; vreg < number_of_vregs; ++vreg) {
DexRegisterLocation::Kind location =
vreg_map.GetLocationKind(vreg, number_of_vregs, code_info, encoding);
if (location == DexRegisterLocation::Kind::kNone) {
// Dex register is dead or uninitialized.
continue;
}
if (location == DexRegisterLocation::Kind::kConstant) {
// We skip constants because the compiled code knows how to handle them.
continue;
}
DCHECK_EQ(location, DexRegisterLocation::Kind::kInStack);
int32_t vreg_value = shadow_frame->GetVReg(vreg);
int32_t slot_offset = vreg_map.GetStackOffsetInBytes(vreg,
number_of_vregs,
code_info,
encoding);
DCHECK_LT(slot_offset, static_cast<int32_t>(frame_size));
DCHECK_GT(slot_offset, 0);
(reinterpret_cast<int32_t*>(memory))[slot_offset / sizeof(int32_t)] = vreg_value;
}
}
native_pc = stack_map.GetNativePcOffset(encoding.stack_map.encoding, kRuntimeISA) +
osr_method->GetEntryPoint();
VLOG(jit) << "Jumping to "
<< method_name
<< "@"
<< std::hex << reinterpret_cast<uintptr_t>(native_pc);
}
{
ManagedStack fragment;
thread->PushManagedStackFragment(&fragment);
(*art_quick_osr_stub)(memory,
frame_size,
native_pc,
result,
shorty,
thread);
if (UNLIKELY(thread->GetException() == Thread::GetDeoptimizationException())) {
thread->DeoptimizeWithDeoptimizationException(result);
}
thread->PopManagedStackFragment(fragment);
}
free(memory);
thread->PushShadowFrame(shadow_frame);
VLOG(jit) << "Done running OSR code for " << method_name;
return true;
}
void Jit::AddMemoryUsage(ArtMethod* method, size_t bytes) {
if (bytes > 4 * MB) {
LOG(INFO) << "Compiler allocated "
<< PrettySize(bytes)
<< " to compile "
<< ArtMethod::PrettyMethod(method);
}
MutexLock mu(Thread::Current(), lock_);
memory_use_.AddValue(bytes);
}
class JitCompileTask FINAL : public Task {
public:
enum TaskKind {
kAllocateProfile,
kCompile,
kCompileOsr
};
JitCompileTask(ArtMethod* method, TaskKind kind) : method_(method), kind_(kind) {
ScopedObjectAccess soa(Thread::Current());
// Add a global ref to the class to prevent class unloading until compilation is done.
klass_ = soa.Vm()->AddGlobalRef(soa.Self(), method_->GetDeclaringClass());
CHECK(klass_ != nullptr);
}
~JitCompileTask() {
ScopedObjectAccess soa(Thread::Current());
soa.Vm()->DeleteGlobalRef(soa.Self(), klass_);
}
void Run(Thread* self) OVERRIDE {
ScopedObjectAccess soa(self);
if (kind_ == kCompile) {
Runtime::Current()->GetJit()->CompileMethod(method_, self, /* osr */ false);
} else if (kind_ == kCompileOsr) {
Runtime::Current()->GetJit()->CompileMethod(method_, self, /* osr */ true);
} else {
DCHECK(kind_ == kAllocateProfile);
if (ProfilingInfo::Create(self, method_, /* retry_allocation */ true)) {
VLOG(jit) << "Start profiling " << ArtMethod::PrettyMethod(method_);
}
}
ProfileSaver::NotifyJitActivity();
}
void Finalize() OVERRIDE {
delete this;
}
private:
ArtMethod* const method_;
const TaskKind kind_;
jobject klass_;
DISALLOW_IMPLICIT_CONSTRUCTORS(JitCompileTask);
};
void Jit::AddSamples(Thread* self, ArtMethod* method, uint16_t count, bool with_backedges) {
if (thread_pool_ == nullptr) {
// Should only see this when shutting down.
DCHECK(Runtime::Current()->IsShuttingDown(self));
return;
}
if (method->IsClassInitializer() || !method->IsCompilable()) {
// We do not want to compile such methods.
return;
}
if (hot_method_threshold_ == 0) {
// Tests might request JIT on first use (compiled synchronously in the interpreter).
return;
}
DCHECK(thread_pool_ != nullptr);
DCHECK_GT(warm_method_threshold_, 0);
DCHECK_GT(hot_method_threshold_, warm_method_threshold_);
DCHECK_GT(osr_method_threshold_, hot_method_threshold_);
DCHECK_GE(priority_thread_weight_, 1);
DCHECK_LE(priority_thread_weight_, hot_method_threshold_);
int32_t starting_count = method->GetCounter();
if (Jit::ShouldUsePriorityThreadWeight(self)) {
count *= priority_thread_weight_;
}
int32_t new_count = starting_count + count; // int32 here to avoid wrap-around;
// Note: Native method have no "warm" state or profiling info.
if (LIKELY(!method->IsNative()) && starting_count < warm_method_threshold_) {
if ((new_count >= warm_method_threshold_) &&
(method->GetProfilingInfo(kRuntimePointerSize) == nullptr)) {
bool success = ProfilingInfo::Create(self, method, /* retry_allocation */ false);
if (success) {
VLOG(jit) << "Start profiling " << method->PrettyMethod();
}
if (thread_pool_ == nullptr) {
// Calling ProfilingInfo::Create might put us in a suspended state, which could
// lead to the thread pool being deleted when we are shutting down.
DCHECK(Runtime::Current()->IsShuttingDown(self));
return;
}
if (!success) {
// We failed allocating. Instead of doing the collection on the Java thread, we push
// an allocation to a compiler thread, that will do the collection.
thread_pool_->AddTask(self, new JitCompileTask(method, JitCompileTask::kAllocateProfile));
}
}
// Avoid jumping more than one state at a time.
new_count = std::min(new_count, hot_method_threshold_ - 1);
} else if (use_jit_compilation_) {
if (starting_count < hot_method_threshold_) {
if ((new_count >= hot_method_threshold_) &&
!code_cache_->ContainsPc(method->GetEntryPointFromQuickCompiledCode())) {
DCHECK(thread_pool_ != nullptr);
thread_pool_->AddTask(self, new JitCompileTask(method, JitCompileTask::kCompile));
}
// Avoid jumping more than one state at a time.
new_count = std::min(new_count, osr_method_threshold_ - 1);
} else if (starting_count < osr_method_threshold_) {
if (!with_backedges) {
// If the samples don't contain any back edge, we don't increment the hotness.
return;
}
DCHECK(!method->IsNative()); // No back edges reported for native methods.
if ((new_count >= osr_method_threshold_) && !code_cache_->IsOsrCompiled(method)) {
DCHECK(thread_pool_ != nullptr);
thread_pool_->AddTask(self, new JitCompileTask(method, JitCompileTask::kCompileOsr));
}
}
}
// Update hotness counter
method->SetCounter(new_count);
}
void Jit::MethodEntered(Thread* thread, ArtMethod* method) {
Runtime* runtime = Runtime::Current();
if (UNLIKELY(runtime->UseJitCompilation() && runtime->GetJit()->JitAtFirstUse())) {
// The compiler requires a ProfilingInfo object.
ProfilingInfo::Create(thread,
method->GetInterfaceMethodIfProxy(kRuntimePointerSize),
/* retry_allocation */ true);
JitCompileTask compile_task(method, JitCompileTask::kCompile);
compile_task.Run(thread);
return;
}
ProfilingInfo* profiling_info = method->GetProfilingInfo(kRuntimePointerSize);
// Update the entrypoint if the ProfilingInfo has one. The interpreter will call it
// instead of interpreting the method.
if ((profiling_info != nullptr) && (profiling_info->GetSavedEntryPoint() != nullptr)) {
Runtime::Current()->GetInstrumentation()->UpdateMethodsCode(
method, profiling_info->GetSavedEntryPoint());
} else {
AddSamples(thread, method, 1, /* with_backedges */false);
}
}
void Jit::InvokeVirtualOrInterface(ObjPtr<mirror::Object> this_object,
ArtMethod* caller,
uint32_t dex_pc,
ArtMethod* callee ATTRIBUTE_UNUSED) {
ScopedAssertNoThreadSuspension ants(__FUNCTION__);
DCHECK(this_object != nullptr);
ProfilingInfo* info = caller->GetProfilingInfo(kRuntimePointerSize);
if (info != nullptr) {
info->AddInvokeInfo(dex_pc, this_object->GetClass());
}
}
void Jit::WaitForCompilationToFinish(Thread* self) {
if (thread_pool_ != nullptr) {
thread_pool_->Wait(self, false, false);
}
}
void Jit::Stop() {
Thread* self = Thread::Current();
// TODO(ngeoffray): change API to not require calling WaitForCompilationToFinish twice.
WaitForCompilationToFinish(self);
GetThreadPool()->StopWorkers(self);
WaitForCompilationToFinish(self);
}
void Jit::Start() {
GetThreadPool()->StartWorkers(Thread::Current());
}
ScopedJitSuspend::ScopedJitSuspend() {
jit::Jit* jit = Runtime::Current()->GetJit();
was_on_ = (jit != nullptr) && (jit->GetThreadPool() != nullptr);
if (was_on_) {
jit->Stop();
}
}
ScopedJitSuspend::~ScopedJitSuspend() {
if (was_on_) {
DCHECK(Runtime::Current()->GetJit() != nullptr);
DCHECK(Runtime::Current()->GetJit()->GetThreadPool() != nullptr);
Runtime::Current()->GetJit()->Start();
}
}
} // namespace jit
} // namespace art