8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse
2025-08-28 07:14:30 +02:00 · 2017-09-12 19:03:39 +02:00 · 2017-09-12 19:03:39 +02:00 · 3789983e89
commit 3789983e89
parent 270fe13182
56923 changed files with 3 additions and 15727 deletions
--- a/src/hotspot/share/code/codeBlob.hpp
+++ b/src/hotspot/share/code/codeBlob.hpp
@ -0,0 +1,681 @@
+/*
+ * Copyright (c) 1998, 2016, 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_VM_CODE_CODEBLOB_HPP
+#define SHARE_VM_CODE_CODEBLOB_HPP
+
+#include "asm/codeBuffer.hpp"
+#include "compiler/compilerDefinitions.hpp"
+#include "compiler/oopMap.hpp"
+#include "runtime/frame.hpp"
+#include "runtime/handles.hpp"
+#include "utilities/align.hpp"
+#include "utilities/macros.hpp"
+
+// CodeBlob Types
+// Used in the CodeCache to assign CodeBlobs to different CodeHeaps
+struct CodeBlobType {
+  enum {
+    MethodNonProfiled   = 0,    // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)
+    MethodProfiled      = 1,    // Execution level 2 and 3 (profiled) nmethods
+    NonNMethod          = 2,    // Non-nmethods like Buffers, Adapters and Runtime Stubs
+    All                 = 3,    // All types (No code cache segmentation)
+    AOT                 = 4,    // AOT methods
+    NumTypes            = 5     // Number of CodeBlobTypes
+  };
+};
+
+// CodeBlob - superclass for all entries in the CodeCache.
+//
+// Subtypes are:
+//   CompiledMethod       : Compiled Java methods (include method that calls to native code)
+//     nmethod            : JIT Compiled Java methods
+//   RuntimeBlob          : Non-compiled method code; generated glue code
+//     RuntimeStub        : Call to VM runtime methods
+//     DeoptimizationBlob : Used for deoptimization
+//     ExceptionBlob      : Used for stack unrolling
+//     SafepointBlob      : Used to handle illegal instruction exceptions
+//
+//
+// Layout:
+//   - header
+//   - relocation
+//   - content space
+//     - instruction space
+//   - data space
+
+
+class CodeBlobLayout;
+
+class CodeBlob VALUE_OBJ_CLASS_SPEC {
+  friend class VMStructs;
+  friend class JVMCIVMStructs;
+  friend class CodeCacheDumper;
+
+protected:
+
+  const CompilerType _type;                      // CompilerType
+  int        _size;                              // total size of CodeBlob in bytes
+  int        _header_size;                       // size of header (depends on subclass)
+  int        _frame_complete_offset;             // instruction offsets in [0.._frame_complete_offset) have
+                                                 // not finished setting up their frame. Beware of pc's in
+                                                 // that range. There is a similar range(s) on returns
+                                                 // which we don't detect.
+  int        _data_offset;                       // offset to where data region begins
+  int        _frame_size;                        // size of stack frame
+
+  address    _code_begin;
+  address    _code_end;
+  address    _content_begin;                     // address to where content region begins (this includes consts, insts, stubs)
+                                                 // address    _content_end - not required, for all CodeBlobs _code_end == _content_end for now
+  address    _data_end;
+  address    _relocation_begin;
+  address    _relocation_end;
+
+  ImmutableOopMapSet* _oop_maps;                 // OopMap for this CodeBlob
+  bool                _caller_must_gc_arguments;
+  CodeStrings         _strings;
+  const char*         _name;
+  S390_ONLY(int       _ctable_offset;)
+
+  CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments);
+  CodeBlob(const char* name, CompilerType type, const CodeBlobLayout& layout, CodeBuffer* cb, int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments);
+public:
+  // Returns the space needed for CodeBlob
+  static unsigned int allocation_size(CodeBuffer* cb, int header_size);
+  static unsigned int align_code_offset(int offset);
+
+  // Deletion
+  virtual void flush();
+
+  // Typing
+  virtual bool is_buffer_blob() const                 { return false; }
+  virtual bool is_nmethod() const                     { return false; }
+  virtual bool is_runtime_stub() const                { return false; }
+  virtual bool is_deoptimization_stub() const         { return false; }
+  virtual bool is_uncommon_trap_stub() const          { return false; }
+  virtual bool is_exception_stub() const              { return false; }
+  virtual bool is_safepoint_stub() const              { return false; }
+  virtual bool is_adapter_blob() const                { return false; }
+  virtual bool is_method_handles_adapter_blob() const { return false; }
+  virtual bool is_aot() const                         { return false; }
+  virtual bool is_compiled() const                    { return false; }
+
+  inline bool is_compiled_by_c1() const    { return _type == compiler_c1; };
+  inline bool is_compiled_by_c2() const    { return _type == compiler_c2; };
+  inline bool is_compiled_by_jvmci() const { return _type == compiler_jvmci; };
+  inline bool is_compiled_by_shark() const { return _type == compiler_shark; };
+  const char* compiler_name() const;
+
+  // Casting
+  nmethod* as_nmethod_or_null()                { return is_nmethod() ? (nmethod*) this : NULL; }
+  nmethod* as_nmethod()                        { assert(is_nmethod(), "must be nmethod"); return (nmethod*) this; }
+  CompiledMethod* as_compiled_method_or_null() { return is_compiled() ? (CompiledMethod*) this : NULL; }
+  CompiledMethod* as_compiled_method()         { assert(is_compiled(), "must be compiled"); return (CompiledMethod*) this; }
+  CodeBlob* as_codeblob_or_null() const        { return (CodeBlob*) this; }
+
+  // Boundaries
+  address header_begin() const        { return (address) this; }
+  relocInfo* relocation_begin() const { return (relocInfo*) _relocation_begin; };
+  relocInfo* relocation_end() const   { return (relocInfo*) _relocation_end; }
+  address content_begin() const       { return _content_begin; }
+  address content_end() const         { return _code_end; } // _code_end == _content_end is true for all types of blobs for now, it is also checked in the constructor
+  address code_begin() const          { return _code_begin;    }
+  address code_end() const            { return _code_end; }
+  address data_end() const            { return _data_end;      }
+
+  // This field holds the beginning of the const section in the old code buffer.
+  // It is needed to fix relocations of pc-relative loads when resizing the
+  // the constant pool or moving it.
+  S390_ONLY(address ctable_begin() const { return header_begin() + _ctable_offset; })
+  void set_ctable_begin(address ctable) { S390_ONLY(_ctable_offset = ctable - header_begin();) }
+
+  // Sizes
+  int size() const                               { return _size; }
+  int header_size() const                        { return _header_size; }
+  int relocation_size() const                    { return (address) relocation_end() - (address) relocation_begin(); }
+  int content_size() const                       { return           content_end()    -           content_begin();    }
+  int code_size() const                          { return           code_end()       -           code_begin();       }
+
+  // Containment
+  bool blob_contains(address addr) const         { return header_begin()       <= addr && addr < data_end();       }
+  bool code_contains(address addr) const         { return code_begin()         <= addr && addr < code_end();       }
+  bool contains(address addr) const              { return content_begin()      <= addr && addr < content_end();    }
+  bool is_frame_complete_at(address addr) const  { return _frame_complete_offset != CodeOffsets::frame_never_safe &&
+                                                          code_contains(addr) && addr >= code_begin() + _frame_complete_offset; }
+
+  // CodeCache support: really only used by the nmethods, but in order to get
+  // asserts and certain bookkeeping to work in the CodeCache they are defined
+  // virtual here.
+  virtual bool is_zombie() const                 { return false; }
+  virtual bool is_locked_by_vm() const           { return false; }
+
+  virtual bool is_unloaded() const               { return false; }
+  virtual bool is_not_entrant() const            { return false; }
+
+  // GC support
+  virtual bool is_alive() const                  = 0;
+
+  // OopMap for frame
+  ImmutableOopMapSet* oop_maps() const           { return _oop_maps; }
+  void set_oop_maps(OopMapSet* p);
+  const ImmutableOopMap* oop_map_for_return_address(address return_address);
+  virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) = 0;
+
+  // Frame support
+  int  frame_size() const                        { return _frame_size; }
+  void set_frame_size(int size)                  { _frame_size = size; }
+
+  // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
+  bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
+
+  // Naming
+  const char* name() const                       { return _name; }
+  void set_name(const char* name)                { _name = name; }
+
+  // Debugging
+  virtual void verify() = 0;
+  virtual void print() const                     { print_on(tty); };
+  virtual void print_on(outputStream* st) const;
+  virtual void print_value_on(outputStream* st) const;
+  void print_code();
+
+  // Print the comment associated with offset on stream, if there is one
+  virtual void print_block_comment(outputStream* stream, address block_begin) const {
+    intptr_t offset = (intptr_t)(block_begin - code_begin());
+    _strings.print_block_comment(stream, offset);
+  }
+
+  // Transfer ownership of comments to this CodeBlob
+  void set_strings(CodeStrings& strings) {
+    assert(!is_aot(), "invalid on aot");
+    _strings.assign(strings);
+  }
+
+  static ByteSize name_field_offset() {
+    return byte_offset_of(CodeBlob, _name);
+  }
+
+  static ByteSize oop_maps_field_offset() {
+    return byte_offset_of(CodeBlob, _oop_maps);
+  }
+};
+
+class CodeBlobLayout : public StackObj {
+private:
+  int _size;
+  int _header_size;
+  int _relocation_size;
+  int _content_offset;
+  int _code_offset;
+  int _data_offset;
+  address _code_begin;
+  address _code_end;
+  address _content_begin;
+  address _content_end;
+  address _data_end;
+  address _relocation_begin;
+  address _relocation_end;
+
+public:
+  CodeBlobLayout(address code_begin, address code_end, address content_begin, address content_end, address data_end, address relocation_begin, address relocation_end) :
+    _size(0),
+    _header_size(0),
+    _relocation_size(0),
+    _content_offset(0),
+    _code_offset(0),
+    _data_offset(0),
+    _content_begin(content_begin),
+    _content_end(content_end),
+    _code_begin(code_begin),
+    _code_end(code_end),
+    _data_end(data_end),
+    _relocation_begin(relocation_begin),
+    _relocation_end(relocation_end)
+  {
+  }
+
+  CodeBlobLayout(const address start, int size, int header_size, int relocation_size, int data_offset) :
+    _size(size),
+    _header_size(header_size),
+    _relocation_size(relocation_size),
+    _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
+    _code_offset(_content_offset),
+    _data_offset(data_offset)
+  {
+    assert(is_aligned(_relocation_size, oopSize), "unaligned size");
+
+    _code_begin = (address) start + _code_offset;
+    _code_end = (address) start + _data_offset;
+
+    _content_begin = (address) start + _content_offset;
+    _content_end = (address) start + _data_offset;
+
+    _data_end = (address) start + _size;
+    _relocation_begin = (address) start + _header_size;
+    _relocation_end = _relocation_begin + _relocation_size;
+  }
+
+  CodeBlobLayout(const address start, int size, int header_size, const CodeBuffer* cb) :
+    _size(size),
+    _header_size(header_size),
+    _relocation_size(align_up(cb->total_relocation_size(), oopSize)),
+    _content_offset(CodeBlob::align_code_offset(_header_size + _relocation_size)),
+    _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
+    _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize))
+  {
+    assert(is_aligned(_relocation_size, oopSize), "unaligned size");
+
+    _code_begin = (address) start + _code_offset;
+    _code_end = (address) start + _data_offset;
+
+    _content_begin = (address) start + _content_offset;
+    _content_end = (address) start + _data_offset;
+
+    _data_end = (address) start + _size;
+    _relocation_begin = (address) start + _header_size;
+    _relocation_end = _relocation_begin + _relocation_size;
+  }
+
+  int size() const { return _size; }
+  int header_size() const { return _header_size; }
+  int relocation_size() const { return _relocation_size; }
+  int content_offset() const { return _content_offset; }
+  int code_offset() const { return _code_offset; }
+  int data_offset() const { return _data_offset; }
+  address code_begin() const { return _code_begin; }
+  address code_end() const { return _code_end; }
+  address data_end() const { return _data_end; }
+  address relocation_begin() const { return _relocation_begin; }
+  address relocation_end() const { return _relocation_end; }
+  address content_begin() const { return _content_begin; }
+  address content_end() const { return _content_end; }
+};
+
+
+class RuntimeBlob : public CodeBlob {
+  friend class VMStructs;
+ public:
+
+  // Creation
+  // a) simple CodeBlob
+  // frame_complete is the offset from the beginning of the instructions
+  // to where the frame setup (from stackwalk viewpoint) is complete.
+  RuntimeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
+
+  // b) full CodeBlob
+  RuntimeBlob(
+    const char* name,
+    CodeBuffer* cb,
+    int         header_size,
+    int         size,
+    int         frame_complete,
+    int         frame_size,
+    OopMapSet*  oop_maps,
+    bool        caller_must_gc_arguments = false
+  );
+
+  // GC support
+  virtual bool is_alive() const                  = 0;
+
+  void verify();
+
+  // OopMap for frame
+  virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { ShouldNotReachHere(); }
+
+  // Debugging
+  void print() const                             { print_on(tty); }
+  virtual void print_on(outputStream* st) const { CodeBlob::print_on(st); }
+  virtual void print_value_on(outputStream* st) const { CodeBlob::print_value_on(st); }
+
+  // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
+  static void trace_new_stub(RuntimeBlob* blob, const char* name1, const char* name2 = "");
+};
+
+class WhiteBox;
+//----------------------------------------------------------------------------------------------------
+// BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
+
+class BufferBlob: public RuntimeBlob {
+  friend class VMStructs;
+  friend class AdapterBlob;
+  friend class MethodHandlesAdapterBlob;
+  friend class WhiteBox;
+
+ private:
+  // Creation support
+  BufferBlob(const char* name, int size);
+  BufferBlob(const char* name, int size, CodeBuffer* cb);
+
+  void* operator new(size_t s, unsigned size) throw();
+
+ public:
+  // Creation
+  static BufferBlob* create(const char* name, int buffer_size);
+  static BufferBlob* create(const char* name, CodeBuffer* cb);
+
+  static void free(BufferBlob* buf);
+
+  // Typing
+  virtual bool is_buffer_blob() const            { return true; }
+
+  // GC/Verification support
+  void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }
+  bool is_alive() const                          { return true; }
+
+  void verify();
+  void print_on(outputStream* st) const;
+  void print_value_on(outputStream* st) const;
+};
+
+
+//----------------------------------------------------------------------------------------------------
+// AdapterBlob: used to hold C2I/I2C adapters
+
+class AdapterBlob: public BufferBlob {
+private:
+  AdapterBlob(int size, CodeBuffer* cb);
+
+public:
+  // Creation
+  static AdapterBlob* create(CodeBuffer* cb);
+
+  // Typing
+  virtual bool is_adapter_blob() const { return true; }
+};
+
+
+//----------------------------------------------------------------------------------------------------
+// MethodHandlesAdapterBlob: used to hold MethodHandles adapters
+
+class MethodHandlesAdapterBlob: public BufferBlob {
+private:
+  MethodHandlesAdapterBlob(int size)                 : BufferBlob("MethodHandles adapters", size) {}
+
+public:
+  // Creation
+  static MethodHandlesAdapterBlob* create(int buffer_size);
+
+  // Typing
+  virtual bool is_method_handles_adapter_blob() const { return true; }
+};
+
+
+//----------------------------------------------------------------------------------------------------
+// RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
+
+class RuntimeStub: public RuntimeBlob {
+  friend class VMStructs;
+ private:
+  // Creation support
+  RuntimeStub(
+    const char* name,
+    CodeBuffer* cb,
+    int         size,
+    int         frame_complete,
+    int         frame_size,
+    OopMapSet*  oop_maps,
+    bool        caller_must_gc_arguments
+  );
+
+  void* operator new(size_t s, unsigned size) throw();
+
+ public:
+  // Creation
+  static RuntimeStub* new_runtime_stub(
+    const char* stub_name,
+    CodeBuffer* cb,
+    int         frame_complete,
+    int         frame_size,
+    OopMapSet*  oop_maps,
+    bool        caller_must_gc_arguments
+  );
+
+  // Typing
+  bool is_runtime_stub() const                   { return true; }
+
+  address entry_point() const                    { return code_begin(); }
+
+  // GC/Verification support
+  void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }
+  bool is_alive() const                          { return true; }
+
+  void verify();
+  void print_on(outputStream* st) const;
+  void print_value_on(outputStream* st) const;
+};
+
+
+//----------------------------------------------------------------------------------------------------
+// Super-class for all blobs that exist in only one instance. Implements default behaviour.
+
+class SingletonBlob: public RuntimeBlob {
+  friend class VMStructs;
+
+ protected:
+  void* operator new(size_t s, unsigned size) throw();
+
+ public:
+   SingletonBlob(
+     const char* name,
+     CodeBuffer* cb,
+     int         header_size,
+     int         size,
+     int         frame_size,
+     OopMapSet*  oop_maps
+   )
+   : RuntimeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
+  {};
+
+  address entry_point()                          { return code_begin(); }
+
+  bool is_alive() const                          { return true; }
+
+  // GC/Verification support
+  void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }
+  void verify(); // does nothing
+  void print_on(outputStream* st) const;
+  void print_value_on(outputStream* st) const;
+};
+
+
+//----------------------------------------------------------------------------------------------------
+// DeoptimizationBlob
+
+class DeoptimizationBlob: public SingletonBlob {
+  friend class VMStructs;
+  friend class JVMCIVMStructs;
+ private:
+  int _unpack_offset;
+  int _unpack_with_exception;
+  int _unpack_with_reexecution;
+
+  int _unpack_with_exception_in_tls;
+
+#if INCLUDE_JVMCI
+  // Offsets when JVMCI calls uncommon_trap.
+  int _uncommon_trap_offset;
+  int _implicit_exception_uncommon_trap_offset;
+#endif
+
+  // Creation support
+  DeoptimizationBlob(
+    CodeBuffer* cb,
+    int         size,
+    OopMapSet*  oop_maps,
+    int         unpack_offset,
+    int         unpack_with_exception_offset,
+    int         unpack_with_reexecution_offset,
+    int         frame_size
+  );
+
+ public:
+  // Creation
+  static DeoptimizationBlob* create(
+    CodeBuffer* cb,
+    OopMapSet*  oop_maps,
+    int         unpack_offset,
+    int         unpack_with_exception_offset,
+    int         unpack_with_reexecution_offset,
+    int         frame_size
+  );
+
+  // Typing
+  bool is_deoptimization_stub() const { return true; }
+  bool exception_address_is_unpack_entry(address pc) const {
+    address unpack_pc = unpack();
+    return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
+  }
+
+  // GC for args
+  void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
+
+  // Printing
+  void print_value_on(outputStream* st) const;
+
+  address unpack() const                         { return code_begin() + _unpack_offset;           }
+  address unpack_with_exception() const          { return code_begin() + _unpack_with_exception;   }
+  address unpack_with_reexecution() const        { return code_begin() + _unpack_with_reexecution; }
+
+  // Alternate entry point for C1 where the exception and issuing pc
+  // are in JavaThread::_exception_oop and JavaThread::_exception_pc
+  // instead of being in registers.  This is needed because C1 doesn't
+  // model exception paths in a way that keeps these registers free so
+  // there may be live values in those registers during deopt.
+  void set_unpack_with_exception_in_tls_offset(int offset) {
+    _unpack_with_exception_in_tls = offset;
+    assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
+  }
+  address unpack_with_exception_in_tls() const   { return code_begin() + _unpack_with_exception_in_tls; }
+
+#if INCLUDE_JVMCI
+  // Offsets when JVMCI calls uncommon_trap.
+  void set_uncommon_trap_offset(int offset) {
+    _uncommon_trap_offset = offset;
+    assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
+  }
+  address uncommon_trap() const                  { return code_begin() + _uncommon_trap_offset; }
+
+  void set_implicit_exception_uncommon_trap_offset(int offset) {
+    _implicit_exception_uncommon_trap_offset = offset;
+    assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
+  }
+  address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
+#endif // INCLUDE_JVMCI
+};
+
+
+//----------------------------------------------------------------------------------------------------
+// UncommonTrapBlob (currently only used by Compiler 2)
+
+#ifdef COMPILER2
+
+class UncommonTrapBlob: public SingletonBlob {
+  friend class VMStructs;
+ private:
+  // Creation support
+  UncommonTrapBlob(
+    CodeBuffer* cb,
+    int         size,
+    OopMapSet*  oop_maps,
+    int         frame_size
+  );
+
+ public:
+  // Creation
+  static UncommonTrapBlob* create(
+    CodeBuffer* cb,
+    OopMapSet*  oop_maps,
+    int         frame_size
+  );
+
+  // GC for args
+  void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f)  { /* nothing to do */ }
+
+  // Typing
+  bool is_uncommon_trap_stub() const             { return true; }
+};
+
+
+//----------------------------------------------------------------------------------------------------
+// ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
+
+class ExceptionBlob: public SingletonBlob {
+  friend class VMStructs;
+ private:
+  // Creation support
+  ExceptionBlob(
+    CodeBuffer* cb,
+    int         size,
+    OopMapSet*  oop_maps,
+    int         frame_size
+  );
+
+ public:
+  // Creation
+  static ExceptionBlob* create(
+    CodeBuffer* cb,
+    OopMapSet*  oop_maps,
+    int         frame_size
+  );
+
+  // GC for args
+  void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }
+
+  // Typing
+  bool is_exception_stub() const                 { return true; }
+};
+#endif // COMPILER2
+
+
+//----------------------------------------------------------------------------------------------------
+// SafepointBlob: handles illegal_instruction exceptions during a safepoint
+
+class SafepointBlob: public SingletonBlob {
+  friend class VMStructs;
+ private:
+  // Creation support
+  SafepointBlob(
+    CodeBuffer* cb,
+    int         size,
+    OopMapSet*  oop_maps,
+    int         frame_size
+  );
+
+ public:
+  // Creation
+  static SafepointBlob* create(
+    CodeBuffer* cb,
+    OopMapSet*  oop_maps,
+    int         frame_size
+  );
+
+  // GC for args
+  void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f)  { /* nothing to do */ }
+
+  // Typing
+  bool is_safepoint_stub() const                 { return true; }
+};
+
+#endif // SHARE_VM_CODE_CODEBLOB_HPP