jdk

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/*
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 * Copyright (c) 2011, 2024, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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#include "precompiled.hpp"
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#include "classfile/vmClasses.hpp"
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#include "compiler/compileBroker.hpp"
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#include "compiler/compilerDefinitions.inline.hpp"
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#include "classfile/moduleEntry.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "jvmci/jvmciEnv.hpp"
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#include "jvmci/jvmciRuntime.hpp"
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#include "oops/objArrayOop.inline.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/handles.inline.hpp"
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JVMCICompiler* JVMCICompiler::_instance = nullptr;
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JVMCICompiler::JVMCICompiler() : AbstractCompiler(compiler_jvmci) {
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  _bootstrapping = false;
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  _bootstrap_compilation_request_handled = false;
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  _methods_compiled = 0;
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  _ok_upcalls = 0;
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  _err_upcalls = 0;
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  _disabled = false;
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  _global_compilation_ticks = 0;
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  assert(_instance == nullptr, "only one instance allowed");
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  _instance = this;
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}
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JVMCICompiler* JVMCICompiler::instance(bool require_non_null, TRAPS) {
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  if (!EnableJVMCI) {
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    THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVMCI is not enabled")
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  }
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  if (_instance == nullptr && require_non_null) {
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    THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "The JVMCI compiler instance has not been created");
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  }
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  return _instance;
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}
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void compiler_stubs_init(bool in_compiler_thread);
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// Initialization
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void JVMCICompiler::initialize() {
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  assert(!CompilerConfig::is_c1_or_interpreter_only_no_jvmci(), "JVMCI is launched, it's not c1/interpreter only mode");
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  if (!UseCompiler || !EnableJVMCI || !UseJVMCICompiler || !should_perform_init()) {
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    return;
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  }
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  compiler_stubs_init(true /* in_compiler_thread */); // generate compiler's intrinsics stubs
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  set_state(initialized);
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}
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void JVMCICompiler::bootstrap(TRAPS) {
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  if (Arguments::mode() == Arguments::_int) {
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    // Nothing to do in -Xint mode
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    return;
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  }
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  _bootstrapping = true;
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  ResourceMark rm(THREAD);
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  HandleMark hm(THREAD);
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  if (PrintBootstrap) {
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    tty->print("Bootstrapping JVMCI");
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  }
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  jlong start = os::javaTimeNanos();
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  Array<Method*>* objectMethods = vmClasses::Object_klass()->methods();
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  // Initialize compile queue with a selected set of methods.
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  int len = objectMethods->length();
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  for (int i = 0; i < len; i++) {
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    methodHandle mh(THREAD, objectMethods->at(i));
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    if (!mh->is_native() && !mh->is_static() && !mh->is_initializer()) {
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      ResourceMark rm;
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      int hot_count = 10; // TODO: what's the appropriate value?
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      CompileBroker::compile_method(mh, InvocationEntryBci, CompLevel_full_optimization, mh, hot_count, CompileTask::Reason_Bootstrap, CHECK);
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    }
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  }
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  int qsize;
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  bool first_round = true;
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  int z = 0;
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  do {
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    // Loop until there is something in the queue.
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    do {
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      THREAD->sleep(100);
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      qsize = CompileBroker::queue_size(CompLevel_full_optimization);
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    } while (!_bootstrap_compilation_request_handled && first_round && qsize == 0);
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    first_round = false;
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    if (PrintBootstrap) {
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      while (z < (_methods_compiled / 100)) {
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        ++z;
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        tty->print_raw(".");
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      }
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    }
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  } while (qsize != 0);
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  if (PrintBootstrap) {
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    tty->print_cr(" in " JLONG_FORMAT " ms (compiled %d methods)",
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                  (jlong)nanos_to_millis(os::javaTimeNanos() - start), _methods_compiled);
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  }
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  _bootstrapping = false;
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  JVMCI::java_runtime()->bootstrap_finished(CHECK);
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}
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bool JVMCICompiler::force_comp_at_level_simple(const methodHandle& method) {
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  if (_disabled) {
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    return true;
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  }
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  if (_bootstrapping) {
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    // When bootstrapping, the JVMCI compiler can compile its own methods.
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    return false;
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  }
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  if (UseJVMCINativeLibrary) {
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    // This mechanism exists to force compilation of a JVMCI compiler by C1
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    // to reduce the compilation time spent on the JVMCI compiler itself. In
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    // +UseJVMCINativeLibrary mode, the JVMCI compiler is AOT compiled.
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    return false;
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  } else {
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    JVMCIRuntime* runtime = JVMCI::java_runtime();
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    if (runtime != nullptr) {
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      JVMCIObject receiver = runtime->probe_HotSpotJVMCIRuntime();
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      if (receiver.is_null()) {
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        return false;
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      }
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      JVMCIEnv* ignored_env = nullptr;
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      objArrayHandle excludeModules(JavaThread::current(), HotSpotJVMCI::HotSpotJVMCIRuntime::excludeFromJVMCICompilation(ignored_env, HotSpotJVMCI::resolve(receiver)));
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      if (excludeModules.not_null()) {
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        ModuleEntry* moduleEntry = method->method_holder()->module();
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        for (int i = 0; i < excludeModules->length(); i++) {
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          if (excludeModules->obj_at(i) == moduleEntry->module()) {
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            return true;
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          }
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        }
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      }
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    }
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    return false;
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  }
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}
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// Compilation entry point for methods
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void JVMCICompiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci, bool install_code, DirectiveSet* directive) {
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  ShouldNotReachHere();
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}
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void JVMCICompiler::stopping_compiler_thread(CompilerThread* current) {
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  if (UseJVMCINativeLibrary) {
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    JVMCIRuntime* runtime = JVMCI::compiler_runtime(current, false);
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    if (runtime != nullptr) {
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      MutexUnlocker unlock(CompileThread_lock);
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      runtime->detach_thread(current, "stopping idle compiler thread");
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    }
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  }
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}
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void JVMCICompiler::on_empty_queue(CompileQueue* queue, CompilerThread* thread) {
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  if (UseJVMCINativeLibrary) {
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    int delay = JVMCICompilerIdleDelay;
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    JVMCIRuntime* runtime = JVMCI::compiler_runtime(thread, false);
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    // Don't detach JVMCI compiler threads from their JVMCI
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    // runtime during the VM startup grace period
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    if (runtime != nullptr && delay > 0 && tty->time_stamp().milliseconds() > DEFAULT_COMPILER_IDLE_DELAY) {
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      bool timeout = MethodCompileQueue_lock->wait(delay);
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      // Unlock as detaching or repacking can result in a JNI call to shutdown a JavaVM
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      // and locks cannot be held when making a VM to native transition.
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      MutexUnlocker unlock(MethodCompileQueue_lock);
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      if (timeout) {
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        runtime->detach_thread(thread, "releasing idle compiler thread");
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      } else {
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        runtime->repack(thread);
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      }
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    }
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  }
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}
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// Print compilation timers
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void JVMCICompiler::print_timers() {
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  tty->print_cr("    JVMCI CompileBroker Time:");
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  tty->print_cr("       Compile:        %7.3f s", stats()->total_time());
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  _jit_code_installs.print_on(tty, "       Install Code:   ");
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  tty->cr();
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  tty->print_cr("    JVMCI Hosted Time:");
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  _hosted_code_installs.print_on(tty, "       Install Code:   ");
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}
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bool JVMCICompiler::is_intrinsic_supported(const methodHandle& method) {
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  vmIntrinsics::ID id = method->intrinsic_id();
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  assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
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  JavaThread* thread = JavaThread::current();
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  JVMCIEnv jvmciEnv(thread, __FILE__, __LINE__);
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  JVMCIRuntime* runtime = JVMCI::compiler_runtime(thread, false);
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  return runtime->is_intrinsic_supported(&jvmciEnv, (jint) id);
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}
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void JVMCICompiler::CodeInstallStats::print_on(outputStream* st, const char* prefix) const {
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  double time = _timer.seconds();
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  st->print_cr("%s%7.3f s (installs: %d, CodeBlob total size: %d, CodeBlob code size: %d)",
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      prefix, time, _count, _codeBlobs_size, _codeBlobs_code_size);
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}
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void JVMCICompiler::CodeInstallStats::on_install(CodeBlob* cb) {
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  Atomic::inc(&_count);
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  Atomic::add(&_codeBlobs_size, cb->size());
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  Atomic::add(&_codeBlobs_code_size, cb->code_size());
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}
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void JVMCICompiler::inc_methods_compiled() {
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  Atomic::inc(&_methods_compiled);
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  Atomic::inc(&_global_compilation_ticks);
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}
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void JVMCICompiler::on_upcall(const char* error, JVMCICompileState* compile_state) {
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  if (error != nullptr) {
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    Atomic::inc(&_err_upcalls);
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    int ok = _ok_upcalls;
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    int err = _err_upcalls;
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    // If there have been at least 10 upcalls with an error
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    // and the number of error upcalls is 10% or more of the
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    // number of non-error upcalls, disable JVMCI compilation.
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    if (err > 10 && err * 10 > ok && !_disabled) {
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      _disabled = true;
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      int total = err + ok;
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      // Using stringStream instead of err_msg to avoid truncation
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      stringStream st;
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      st.print("JVMCI compiler disabled "
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               "after %d of %d upcalls had errors (Last error: \"%s\"). "
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               "Use -Xlog:jit+compilation for more detail.", err, total, error);
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      const char* disable_msg = st.freeze();
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      log_warning(jit,compilation)("%s", disable_msg);
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      if (compile_state != nullptr) {
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        const char* disable_error = os::strdup(disable_msg);
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        if (disable_error != nullptr) {
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          compile_state->set_failure(true, disable_error, true);
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          JVMCI_event_1("%s", disable_error);
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          return;
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        } else {
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          // Leave failure reason as set by caller when strdup fails
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        }
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      }
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    }
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    JVMCI_event_1("JVMCI upcall had an error: %s", error);
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  } else {
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    Atomic::inc(&_ok_upcalls);
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  }
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}
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void JVMCICompiler::inc_global_compilation_ticks() {
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  Atomic::inc(&_global_compilation_ticks);
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}
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