/*

 * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#ifndef SHARE_JVMCI_JVMCIRUNTIME_HPP

#define SHARE_JVMCI_JVMCIRUNTIME_HPP

#include "code/nmethod.hpp"

#include "jvmci/jvmci.hpp"

#include "jvmci/jvmciExceptions.hpp"

#include "jvmci/jvmciObject.hpp"

class JVMCIEnv;

class JVMCICompiler;

class JVMCICompileState;

// Encapsulates the JVMCI metadata for an nmethod.

// JVMCINMethodData objects are inlined into nmethods

// at nmethod::_jvmci_data_offset.

class JVMCINMethodData {

  // Index for the HotSpotNmethod mirror in the nmethod's oops table.

  // This is -1 if there is no mirror in the oops table.

  int _nmethod_mirror_index;

  // Is HotSpotNmethod.name non-null? If so, the value is

  // embedded in the end of this object.

  bool _has_name;

  // Address of the failed speculations list to which a speculation

  // is appended when it causes a deoptimization.

  FailedSpeculation** _failed_speculations;

public:

  // Computes the size of a JVMCINMethodData object

  static int compute_size(const char* nmethod_mirror_name) {

    int size = sizeof(JVMCINMethodData);

    if (nmethod_mirror_name != NULL) {

      size += (int) strlen(nmethod_mirror_name) + 1;

    }

    return size;

  }

  void initialize(int nmethod_mirror_index,

             const char* name,

             FailedSpeculation** failed_speculations);

  // Adds `speculation` to the failed speculations list.

  void add_failed_speculation(nmethod* nm, jlong speculation);

  // Gets the JVMCI name of the nmethod (which may be NULL).

  const char* name() { return _has_name ? (char*)(((address) this) + sizeof(JVMCINMethodData)) : NULL; }

  // Clears the HotSpotNmethod.address field in the  mirror. If nm

  // is dead, the HotSpotNmethod.entryPoint field is also cleared.

  void invalidate_nmethod_mirror(nmethod* nm);

  // Gets the mirror from nm's oops table.

  oop get_nmethod_mirror(nmethod* nm);

  // Sets the mirror in nm's oops table.

  void set_nmethod_mirror(nmethod* nm, oop mirror);

  // Clears the mirror in nm's oops table.

  void clear_nmethod_mirror(nmethod* nm);

};

// A top level class that represents an initialized JVMCI runtime.

// There is one instance of this class per HotSpotJVMCIRuntime object.

class JVMCIRuntime: public CHeapObj<mtJVMCI> {

 public:

  // Constants describing whether JVMCI wants to be able to adjust the compilation

  // level selected for a method by the VM compilation policy and if so, based on

  // what information about the method being schedule for compilation.

  enum CompLevelAdjustment {

     none = 0,             // no adjustment

     by_holder = 1,        // adjust based on declaring class of method

     by_full_signature = 2 // adjust based on declaring class, name and signature of method

  };

 private:

  volatile bool _being_initialized;

  volatile bool _initialized;

  JVMCIObject _HotSpotJVMCIRuntime_instance;

  bool _shutdown_called;

  JVMCIObject create_jvmci_primitive_type(BasicType type, JVMCI_TRAPS);

  // Implementation methods for loading and constant pool access.

  static Klass* get_klass_by_name_impl(Klass*& accessing_klass,

                                       const constantPoolHandle& cpool,

                                       Symbol* klass_name,

                                       bool require_local);

  static Klass*   get_klass_by_index_impl(const constantPoolHandle& cpool,

                                          int klass_index,

                                          bool& is_accessible,

                                          Klass* loading_klass);

  static void   get_field_by_index_impl(InstanceKlass* loading_klass, fieldDescriptor& fd,

                                        int field_index);

  static methodHandle  get_method_by_index_impl(const constantPoolHandle& cpool,

                                                int method_index, Bytecodes::Code bc,

                                                InstanceKlass* loading_klass);

  // Helper methods

  static bool       check_klass_accessibility(Klass* accessing_klass, Klass* resolved_klass);

  static methodHandle  lookup_method(InstanceKlass*  accessor,

                                     Klass*  holder,

                                     Symbol*         name,

                                     Symbol*         sig,

                                     Bytecodes::Code bc,

                                     constantTag     tag);

 public:

  JVMCIRuntime() {

    _initialized = false;

    _being_initialized = false;

    _shutdown_called = false;

  }

  /**

   * Compute offsets and construct any state required before executing JVMCI code.

   */

  void initialize(JVMCIEnv* jvmciEnv);

  /**

   * Gets the singleton HotSpotJVMCIRuntime instance, initializing it if necessary

   */

  JVMCIObject get_HotSpotJVMCIRuntime(JVMCI_TRAPS);

  bool is_HotSpotJVMCIRuntime_initialized() {

    return _HotSpotJVMCIRuntime_instance.is_non_null();

  }

  /**

   * Trigger initialization of HotSpotJVMCIRuntime through JVMCI.getRuntime()

   */

  void initialize_JVMCI(JVMCI_TRAPS);

  /**

   * Explicitly initialize HotSpotJVMCIRuntime itself

   */

  void initialize_HotSpotJVMCIRuntime(JVMCI_TRAPS);

  void call_getCompiler(TRAPS);

  void shutdown();

  bool shutdown_called() {

    return _shutdown_called;

  }

  void bootstrap_finished(TRAPS);

  // Look up a klass by name from a particular class loader (the accessor's).

  // If require_local, result must be defined in that class loader, or NULL.

  // If !require_local, a result from remote class loader may be reported,

  // if sufficient class loader constraints exist such that initiating

  // a class loading request from the given loader is bound to return

  // the class defined in the remote loader (or throw an error).

  //

  // Return an unloaded klass if !require_local and no class at all is found.

  //

  // The CI treats a klass as loaded if it is consistently defined in

  // another loader, even if it hasn't yet been loaded in all loaders

  // that could potentially see it via delegation.

  static Klass* get_klass_by_name(Klass* accessing_klass,

                                  Symbol* klass_name,

                                  bool require_local);

  // Constant pool access.

  static Klass*   get_klass_by_index(const constantPoolHandle& cpool,

                                     int klass_index,

                                     bool& is_accessible,

                                     Klass* loading_klass);

  static void   get_field_by_index(InstanceKlass* loading_klass, fieldDescriptor& fd,

                                   int field_index);

  static methodHandle  get_method_by_index(const constantPoolHandle& cpool,

                                           int method_index, Bytecodes::Code bc,

                                           InstanceKlass* loading_klass);

  // converts the Klass* representing the holder of a method into a

  // InstanceKlass*.  This is needed since the holder of a method in

  // the bytecodes could be an array type.  Basically this converts

  // array types into java/lang/Object and other types stay as they are.

  static InstanceKlass* get_instance_klass_for_declared_method_holder(Klass* klass);

  // Helper routine for determining the validity of a compilation

  // with respect to concurrent class loading.

  static JVMCI::CodeInstallResult validate_compile_task_dependencies(Dependencies* target, JVMCICompileState* task, char** failure_detail);

  // Compiles `target` with the JVMCI compiler.

  void compile_method(JVMCIEnv* JVMCIENV, JVMCICompiler* compiler, const methodHandle& target, int entry_bci);

  // Register the result of a compilation.

  JVMCI::CodeInstallResult register_method(JVMCIEnv* JVMCIENV,

                       const methodHandle&       target,

                       nmethod*&                 nm,

                       int                       entry_bci,

                       CodeOffsets*              offsets,

                       int                       orig_pc_offset,

                       CodeBuffer*               code_buffer,

                       int                       frame_words,

                       OopMapSet*                oop_map_set,

                       ExceptionHandlerTable*    handler_table,

                       AbstractCompiler*         compiler,

                       DebugInformationRecorder* debug_info,

                       Dependencies*             dependencies,

                       int                       compile_id,

                       bool                      has_unsafe_access,

                       bool                      has_wide_vector,

                       JVMCIObject               compiled_code,

                       JVMCIObject               nmethod_mirror,

                       FailedSpeculation**       failed_speculations,

                       char*                     speculations,

                       int                       speculations_len);

  /**

   * Exits the VM due to an unexpected exception.

   */

  static void exit_on_pending_exception(JVMCIEnv* JVMCIENV, const char* message);

  static void describe_pending_hotspot_exception(JavaThread* THREAD, bool clear);

#define CHECK_EXIT THREAD); \

  if (HAS_PENDING_EXCEPTION) { \

    char buf[256]; \

    jio_snprintf(buf, 256, "Uncaught exception at %s:%d", __FILE__, __LINE__); \

    JVMCIRuntime::exit_on_pending_exception(NULL, buf); \

    return; \

  } \

  (void)(0

#define CHECK_EXIT_(v) THREAD);                 \

  if (HAS_PENDING_EXCEPTION) { \

    char buf[256]; \

    jio_snprintf(buf, 256, "Uncaught exception at %s:%d", __FILE__, __LINE__); \

    JVMCIRuntime::exit_on_pending_exception(NULL, buf); \

    return v; \

  } \

  (void)(0

#define JVMCI_CHECK_EXIT JVMCIENV); \

  if (JVMCIENV->has_pending_exception()) {      \

    char buf[256]; \

    jio_snprintf(buf, 256, "Uncaught exception at %s:%d", __FILE__, __LINE__); \

    JVMCIRuntime::exit_on_pending_exception(JVMCIENV, buf); \

    return; \

  } \

  (void)(0

#define JVMCI_CHECK_EXIT_(result) JVMCIENV); \

  if (JVMCIENV->has_pending_exception()) {      \

    char buf[256]; \

    jio_snprintf(buf, 256, "Uncaught exception at %s:%d", __FILE__, __LINE__); \

    JVMCIRuntime::exit_on_pending_exception(JVMCIENV, buf); \

    return result; \

  } \

  (void)(0

  static BasicType kindToBasicType(const Handle& kind, TRAPS);

  static void new_instance_common(JavaThread* thread, Klass* klass, bool null_on_fail);

  static void new_array_common(JavaThread* thread, Klass* klass, jint length, bool null_on_fail);

  static void new_multi_array_common(JavaThread* thread, Klass* klass, int rank, jint* dims, bool null_on_fail);

  static void dynamic_new_array_common(JavaThread* thread, oopDesc* element_mirror, jint length, bool null_on_fail);

  static void dynamic_new_instance_common(JavaThread* thread, oopDesc* type_mirror, bool null_on_fail);

  // The following routines are called from compiled JVMCI code

  // When allocation fails, these stubs:

  // 1. Exercise -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError handling and also

  //    post a JVMTI_EVENT_RESOURCE_EXHAUSTED event if the failure is an OutOfMemroyError

  // 2. Return NULL with a pending exception.

  // Compiled code must ensure these stubs are not called twice for the same allocation

  // site due to the non-repeatable side effects in the case of OOME.

  static void new_instance(JavaThread* thread, Klass* klass) { new_instance_common(thread, klass, false); }

  static void new_array(JavaThread* thread, Klass* klass, jint length) { new_array_common(thread, klass, length, false); }

  static void new_multi_array(JavaThread* thread, Klass* klass, int rank, jint* dims) { new_multi_array_common(thread, klass, rank, dims, false); }

  static void dynamic_new_array(JavaThread* thread, oopDesc* element_mirror, jint length) { dynamic_new_array_common(thread, element_mirror, length, false); }

  static void dynamic_new_instance(JavaThread* thread, oopDesc* type_mirror) { dynamic_new_instance_common(thread, type_mirror, false); }

  // When allocation fails, these stubs return NULL and have no pending exception. Compiled code

  // can use these stubs if a failed allocation will be retried (e.g., by deoptimizing and

  // re-executing in the interpreter).

  static void new_instance_or_null(JavaThread* thread, Klass* klass) { new_instance_common(thread, klass, true); }

  static void new_array_or_null(JavaThread* thread, Klass* klass, jint length) { new_array_common(thread, klass, length, true); }

  static void new_multi_array_or_null(JavaThread* thread, Klass* klass, int rank, jint* dims) { new_multi_array_common(thread, klass, rank, dims, true); }

  static void dynamic_new_array_or_null(JavaThread* thread, oopDesc* element_mirror, jint length) { dynamic_new_array_common(thread, element_mirror, length, true); }

  static void dynamic_new_instance_or_null(JavaThread* thread, oopDesc* type_mirror) { dynamic_new_instance_common(thread, type_mirror, true); }

  static jboolean thread_is_interrupted(JavaThread* thread, oopDesc* obj, jboolean clear_interrupted);

  static void vm_message(jboolean vmError, jlong format, jlong v1, jlong v2, jlong v3);

  static jint identity_hash_code(JavaThread* thread, oopDesc* obj);

  static address exception_handler_for_pc(JavaThread* thread);

  static void monitorenter(JavaThread* thread, oopDesc* obj, BasicLock* lock);

  static void monitorexit (JavaThread* thread, oopDesc* obj, BasicLock* lock);

  static jboolean object_notify(JavaThread* thread, oopDesc* obj);

  static jboolean object_notifyAll(JavaThread* thread, oopDesc* obj);

  static void vm_error(JavaThread* thread, jlong where, jlong format, jlong value);

  static oopDesc* load_and_clear_exception(JavaThread* thread);

  static void log_printf(JavaThread* thread, const char* format, jlong v1, jlong v2, jlong v3);

  static void log_primitive(JavaThread* thread, jchar typeChar, jlong value, jboolean newline);

  // Print the passed in object, optionally followed by a newline.  If

  // as_string is true and the object is a java.lang.String then it

  // printed as a string, otherwise the type of the object is printed

  // followed by its address.

  static void log_object(JavaThread* thread, oopDesc* object, bool as_string, bool newline);

#if INCLUDE_G1GC

  static void write_barrier_pre(JavaThread* thread, oopDesc* obj);

  static void write_barrier_post(JavaThread* thread, void* card);

#endif

  static jboolean validate_object(JavaThread* thread, oopDesc* parent, oopDesc* child);

  // used to throw exceptions from compiled JVMCI code

  static void throw_and_post_jvmti_exception(JavaThread* thread, const char* exception, const char* message);

  // helper methods to throw exception with complex messages

  static void throw_klass_external_name_exception(JavaThread* thread, const char* exception, Klass* klass);

  static void throw_class_cast_exception(JavaThread* thread, const char* exception, Klass* caster_klass, Klass* target_klass);

  // Test only function

  static jint test_deoptimize_call_int(JavaThread* thread, int value);

};

// Tracing macros.

#define IF_TRACE_jvmci_1 if (!(JVMCITraceLevel >= 1)) ; else

#define IF_TRACE_jvmci_2 if (!(JVMCITraceLevel >= 2)) ; else

#define IF_TRACE_jvmci_3 if (!(JVMCITraceLevel >= 3)) ; else

#define IF_TRACE_jvmci_4 if (!(JVMCITraceLevel >= 4)) ; else

#define IF_TRACE_jvmci_5 if (!(JVMCITraceLevel >= 5)) ; else

#define TRACE_jvmci_1 if (!(JVMCITraceLevel >= 1 && (tty->print(PTR_FORMAT " JVMCITrace-1: ", p2i(JavaThread::current())), true))) ; else tty->print_cr

#define TRACE_jvmci_2 if (!(JVMCITraceLevel >= 2 && (tty->print(PTR_FORMAT "    JVMCITrace-2: ", p2i(JavaThread::current())), true))) ; else tty->print_cr

#define TRACE_jvmci_3 if (!(JVMCITraceLevel >= 3 && (tty->print(PTR_FORMAT "       JVMCITrace-3: ", p2i(JavaThread::current())), true))) ; else tty->print_cr

#define TRACE_jvmci_4 if (!(JVMCITraceLevel >= 4 && (tty->print(PTR_FORMAT "          JVMCITrace-4: ", p2i(JavaThread::current())), true))) ; else tty->print_cr

#define TRACE_jvmci_5 if (!(JVMCITraceLevel >= 5 && (tty->print(PTR_FORMAT "             JVMCITrace-5: ", p2i(JavaThread::current())), true))) ; else tty->print_cr

#endif // SHARE_JVMCI_JVMCIRUNTIME_HPP