JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2011, 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_JVMCICODEINSTALLER_HPP
#define SHARE_JVMCI_JVMCICODEINSTALLER_HPP

#include "code/debugInfoRec.hpp"
#include "code/exceptionHandlerTable.hpp"
#include "code/nativeInst.hpp"
#include "jvmci/jvmci.hpp"
#include "jvmci/jvmciEnv.hpp"

#if INCLUDE_AOT
class RelocBuffer : public StackObj {
  enum { stack_size = 1024 };
public:
  RelocBuffer() : _size(0), _buffer(0) {}
  ~RelocBuffer();
  void ensure_size(size_t bytes);
  void set_size(size_t bytes);
  address begin() const;
  size_t size() const { return _size; }
private:
  size_t _size;
  char _static_buffer[stack_size];
  char *_buffer;
};

class CodeInstaller;

class AOTOopRecorder : public OopRecorder {
public:
  AOTOopRecorder(CodeInstaller* code_inst, Arena* arena = NULL, bool deduplicate = false);

  virtual int find_index(Metadata* h);
  virtual int find_index(jobject h);
  int nr_meta_refs() const;
  jobject meta_element(int pos) const;

private:
  void record_meta_ref(jobject ref, int index);

  GrowableArray<jobject>* _meta_refs;

  CodeInstaller* _code_inst;
};
#endif // INCLUDE_AOT

class CodeMetadata {
public:
  CodeMetadata() {}

  CodeBlob* get_code_blob() const { return _cb; }

  PcDesc* get_pc_desc() const { return _pc_desc; }
  int get_nr_pc_desc() const { return _nr_pc_desc; }

  u_char* get_scopes_desc() const { return _scopes_desc; }
  int get_scopes_size() const { return _nr_scopes_desc; }

#if INCLUDE_AOT
  RelocBuffer* get_reloc_buffer() { return &_reloc_buffer; }
  AOTOopRecorder* get_oop_recorder() { return _oop_recorder; }
#endif

  ExceptionHandlerTable* get_exception_table() { return _exception_table; }

  ImplicitExceptionTable* get_implicit_exception_table() { return _implicit_exception_table; }

  void set_pc_desc(PcDesc* desc, int count) {
    _pc_desc = desc;
    _nr_pc_desc = count;
  }

  void set_scopes(u_char* scopes, int size) {
    _scopes_desc = scopes;
    _nr_scopes_desc = size;
  }

#if INCLUDE_AOT
  void set_oop_recorder(AOTOopRecorder* recorder) {
    _oop_recorder = recorder;
  }
#endif

  void set_exception_table(ExceptionHandlerTable* table) {
    _exception_table = table;
  }

  void set_implicit_exception_table(ImplicitExceptionTable* table) {
    _implicit_exception_table = table;
  }

private:
  CodeBlob* _cb;
  PcDesc* _pc_desc;
  int _nr_pc_desc;

  u_char* _scopes_desc;
  int _nr_scopes_desc;

#if INCLUDE_AOT
  RelocBuffer _reloc_buffer;
  AOTOopRecorder* _oop_recorder;
#endif
  ExceptionHandlerTable* _exception_table;
  ImplicitExceptionTable* _implicit_exception_table;
};

/*
 * This class handles the conversion from a InstalledCode to a CodeBlob or an nmethod.
 */
class CodeInstaller : public StackObj {
  friend class JVMCIVMStructs;
private:
  enum MarkId {
    VERIFIED_ENTRY                         = 1,
    UNVERIFIED_ENTRY                       = 2,
    OSR_ENTRY                              = 3,
    EXCEPTION_HANDLER_ENTRY                = 4,
    DEOPT_HANDLER_ENTRY                    = 5,
    INVOKEINTERFACE                        = 6,
    INVOKEVIRTUAL                          = 7,
    INVOKESTATIC                           = 8,
    INVOKESPECIAL                          = 9,
    INLINE_INVOKE                          = 10,
    POLL_NEAR                              = 11,
    POLL_RETURN_NEAR                       = 12,
    POLL_FAR                               = 13,
    POLL_RETURN_FAR                        = 14,
    CARD_TABLE_ADDRESS                     = 15,
    CARD_TABLE_SHIFT                       = 16,
    HEAP_TOP_ADDRESS                       = 17,
    HEAP_END_ADDRESS                       = 18,
    NARROW_KLASS_BASE_ADDRESS              = 19,
    NARROW_OOP_BASE_ADDRESS                = 20,
    CRC_TABLE_ADDRESS                      = 21,
    LOG_OF_HEAP_REGION_GRAIN_BYTES         = 22,
    INLINE_CONTIGUOUS_ALLOCATION_SUPPORTED = 23,
    INVOKE_INVALID                         = -1
  };

  Arena         _arena;
  JVMCIEnv*     _jvmci_env;

  JVMCIPrimitiveArray    _data_section_handle;
  JVMCIObjectArray       _data_section_patches_handle;
  JVMCIObjectArray       _sites_handle;
#ifndef PRODUCT
  JVMCIObjectArray       _comments_handle;
#endif
  JVMCIPrimitiveArray    _code_handle;
  JVMCIObject            _word_kind_handle;

  CodeOffsets   _offsets;

  jint          _code_size;
  jint          _total_frame_size;
  jint          _orig_pc_offset;
  jint          _parameter_count;
  jint          _constants_size;

  bool          _has_wide_vector;

  MarkId        _next_call_type;
  address       _invoke_mark_pc;

  CodeSection*  _instructions;
  CodeSection*  _constants;

  OopRecorder*              _oop_recorder;
  DebugInformationRecorder* _debug_recorder;
  Dependencies*             _dependencies;
  ExceptionHandlerTable     _exception_handler_table;
  ImplicitExceptionTable    _implicit_exception_table;

  bool _immutable_pic_compilation;  // Installer is called for Immutable PIC compilation.

  static ConstantOopWriteValue* _oop_null_scope_value;
  static ConstantIntValue*    _int_m1_scope_value;
  static ConstantIntValue*    _int_0_scope_value;
  static ConstantIntValue*    _int_1_scope_value;
  static ConstantIntValue*    _int_2_scope_value;
  static LocationValue*       _illegal_value;

  jint pd_next_offset(NativeInstruction* inst, jint pc_offset, JVMCIObject method, JVMCI_TRAPS);
  void pd_patch_OopConstant(int pc_offset, JVMCIObject constant, JVMCI_TRAPS);
  void pd_patch_MetaspaceConstant(int pc_offset, JVMCIObject constant, JVMCI_TRAPS);
  void pd_patch_DataSectionReference(int pc_offset, int data_offset, JVMCI_TRAPS);
  void pd_relocate_ForeignCall(NativeInstruction* inst, jlong foreign_call_destination, JVMCI_TRAPS);
  void pd_relocate_JavaMethod(CodeBuffer &cbuf, JVMCIObject method, jint pc_offset, JVMCI_TRAPS);
  void pd_relocate_poll(address pc, jint mark, JVMCI_TRAPS);

  JVMCIObjectArray sites()                { return _sites_handle; }
  JVMCIPrimitiveArray code()              { return _code_handle; }
  JVMCIPrimitiveArray  data_section()     { return _data_section_handle; }
  JVMCIObjectArray data_section_patches() { return _data_section_patches_handle; }
#ifndef PRODUCT
  JVMCIObjectArray comments()             { return _comments_handle; }
#endif
  JVMCIObject word_kind()                 { return _word_kind_handle; }

public:

  CodeInstaller(JVMCIEnv* jvmci_env, bool immutable_pic_compilation) : _arena(mtJVMCI), _jvmci_env(jvmci_env), _immutable_pic_compilation(immutable_pic_compilation) {}

#if INCLUDE_AOT
  JVMCI::CodeInstallResult gather_metadata(JVMCIObject target, JVMCIObject compiled_code, CodeMetadata& metadata, JVMCI_TRAPS);
#endif
  JVMCI::CodeInstallResult install(JVMCICompiler* compiler,
                                   JVMCIObject target,
                                   JVMCIObject compiled_code,
                                   CodeBlob*& cb,
                                   JVMCIObject installed_code,
                                   FailedSpeculation** failed_speculations,
                                   char* speculations,
                                   int speculations_len,
                                   JVMCI_TRAPS);

  JVMCIEnv* jvmci_env() { return _jvmci_env; }
  JVMCIRuntime* runtime() { return _jvmci_env->runtime(); }

  static address runtime_call_target_address(oop runtime_call);
  static VMReg get_hotspot_reg(jint jvmciRegisterNumber, JVMCI_TRAPS);
  static bool is_general_purpose_reg(VMReg hotspotRegister);

  const OopMapSet* oopMapSet() const { return _debug_recorder->_oopmaps; }

protected:
  Location::Type get_oop_type(JVMCIObject value);
  ScopeValue* get_scope_value(JVMCIObject value, BasicType type, GrowableArray<ScopeValue*>* objects, ScopeValue* &second, JVMCI_TRAPS);
  MonitorValue* get_monitor_value(JVMCIObject value, GrowableArray<ScopeValue*>* objects, JVMCI_TRAPS);

  void* record_metadata_reference(CodeSection* section, address dest, JVMCIObject constant, JVMCI_TRAPS);
#ifdef _LP64
  narrowKlass record_narrow_metadata_reference(CodeSection* section, address dest, JVMCIObject constant, JVMCI_TRAPS);
#endif

  // extract the fields of the HotSpotCompiledCode
  void initialize_fields(JVMCIObject target, JVMCIObject compiled_code, JVMCI_TRAPS);
  void initialize_dependencies(JVMCIObject compiled_code, OopRecorder* oop_recorder, JVMCI_TRAPS);

  int estimate_stubs_size(JVMCI_TRAPS);

  // perform data and call relocation on the CodeBuffer
  JVMCI::CodeInstallResult initialize_buffer(CodeBuffer& buffer, bool check_size, JVMCI_TRAPS);

  void assumption_NoFinalizableSubclass(JVMCIObject assumption);
  void assumption_ConcreteSubtype(JVMCIObject assumption);
  void assumption_LeafType(JVMCIObject assumption);
  void assumption_ConcreteMethod(JVMCIObject assumption);
  void assumption_CallSiteTargetValue(JVMCIObject assumption, JVMCI_TRAPS);

  void site_Safepoint(CodeBuffer& buffer, jint pc_offset, JVMCIObject site, JVMCI_TRAPS);
  void site_Infopoint(CodeBuffer& buffer, jint pc_offset, JVMCIObject site, JVMCI_TRAPS);
  void site_Call(CodeBuffer& buffer, jint pc_offset, JVMCIObject site, JVMCI_TRAPS);
  void site_DataPatch(CodeBuffer& buffer, jint pc_offset, JVMCIObject site, JVMCI_TRAPS);
  void site_Mark(CodeBuffer& buffer, jint pc_offset, JVMCIObject site, JVMCI_TRAPS);

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