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 /*

  * Copyright (c) 1997, 2010, 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.

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  */

 typedef class BytecodeInterpreter* interpreterState;

 class CodeBlob;

 class vframeArray;

 // A frame represents a physical stack frame (an activation).  Frames

 // can be C or Java frames, and the Java frames can be interpreted or

 // compiled.  In contrast, vframes represent source-level activations,

 // so that one physical frame can correspond to multiple source level

 // frames because of inlining.

 class frame VALUE_OBJ_CLASS_SPEC {

  private:

   // Instance variables:

   intptr_t* _sp; // stack pointer (from Thread::last_Java_sp)

   address   _pc; // program counter (the next instruction after the call)

   CodeBlob* _cb; // CodeBlob that "owns" pc

   enum deopt_state {

     not_deoptimized,

     is_deoptimized,

     unknown

   };

   deopt_state _deopt_state;

  public:

   // Constructors

   frame();

   // Accessors

   // pc: Returns the pc at which this frame will continue normally.

   // It must point at the beginning of the next instruction to execute.

   address pc() const             { return _pc; }

   // This returns the pc that if you were in the debugger you'd see. Not

   // the idealized value in the frame object. This undoes the magic conversion

   // that happens for deoptimized frames. In addition it makes the value the

   // hardware would want to see in the native frame. The only user (at this point)

   // is deoptimization. It likely no one else should ever use it.

   address raw_pc() const;

   void set_pc( address   newpc );

   intptr_t* sp() const           { return _sp; }

   void set_sp( intptr_t* newsp ) { _sp = newsp; }

   CodeBlob* cb() const           { return _cb; }

   // patching operations

   void   patch_pc(Thread* thread, address pc);

   // Every frame needs to return a unique id which distinguishes it from all other frames.

   // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames

   // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame

   // should have an id() of NULL so it is a distinguishing value for an unmatchable frame.

   // We also have relationals which allow comparing a frame to anoth frame's id() allow

   // us to distinguish younger (more recent activation) from older (less recent activations)

   // A NULL id is only valid when comparing for equality.

   intptr_t* id(void) const;

   bool is_younger(intptr_t* id) const;

   bool is_older(intptr_t* id) const;

   // testers

   // Compares for strict equality. Rarely used or needed.

   // It can return a different result than f1.id() == f2.id()

   bool equal(frame other) const;

   // type testers

   bool is_interpreted_frame()    const;

   bool is_java_frame()           const;

   bool is_entry_frame()          const;             // Java frame called from C?

   bool is_native_frame()         const;

   bool is_runtime_frame()        const;

   bool is_compiled_frame()       const;

   bool is_safepoint_blob_frame() const;

   bool is_deoptimized_frame()    const;

   // testers

   bool is_first_frame() const; // oldest frame? (has no sender)

   bool is_first_java_frame() const;              // same for Java frame

   bool is_interpreted_frame_valid(JavaThread* thread) const;       // performs sanity checks on interpreted frames.

   // tells whether this frame is marked for deoptimization

   bool should_be_deoptimized() const;

   // tells whether this frame can be deoptimized

   bool can_be_deoptimized() const;

   // returns the frame size in stack slots

   int frame_size(RegisterMap* map) const;

   // returns the sending frame

   frame sender(RegisterMap* map) const;

   // for Profiling - acting on another frame. walks sender frames

   // if valid.

   frame profile_find_Java_sender_frame(JavaThread *thread);

   bool safe_for_sender(JavaThread *thread);

   // returns the sender, but skips conversion frames

   frame real_sender(RegisterMap* map) const;

   // returns the the sending Java frame, skipping any intermediate C frames

   // NB: receiver must not be first frame

   frame java_sender() const;

  private:

   // Helper methods for better factored code in frame::sender

   frame sender_for_compiled_frame(RegisterMap* map) const;

   frame sender_for_entry_frame(RegisterMap* map) const;

   frame sender_for_interpreter_frame(RegisterMap* map) const;

   frame sender_for_native_frame(RegisterMap* map) const;

   // All frames:

   // A low-level interface for vframes:

  public:

   intptr_t* addr_at(int index) const             { return &fp()[index];    }

   intptr_t  at(int index) const                  { return *addr_at(index); }

   // accessors for locals

   oop obj_at(int offset) const                   { return *obj_at_addr(offset);  }

   void obj_at_put(int offset, oop value)         { *obj_at_addr(offset) = value; }

   jint int_at(int offset) const                  { return *int_at_addr(offset);  }

   void int_at_put(int offset, jint value)        { *int_at_addr(offset) = value; }

   oop*      obj_at_addr(int offset) const        { return (oop*)     addr_at(offset); }

   oop*      adjusted_obj_at_addr(methodOop method, int index) { return obj_at_addr(adjust_offset(method, index)); }

  private:

   jint*    int_at_addr(int offset) const         { return (jint*)    addr_at(offset); }

  public:

   // Link (i.e., the pointer to the previous frame)

   intptr_t* link() const;

   void set_link(intptr_t* addr);

   // Return address

   address  sender_pc() const;

   // Support for deoptimization

   void deoptimize(JavaThread* thread);

   // The frame's original SP, before any extension by an interpreted callee;

   // used for packing debug info into vframeArray objects and vframeArray lookup.

   intptr_t* unextended_sp() const;

   // returns the stack pointer of the calling frame

   intptr_t* sender_sp() const;

   // Interpreter frames:

  private:

   intptr_t** interpreter_frame_locals_addr() const;

   intptr_t*  interpreter_frame_bcx_addr() const;

   intptr_t*  interpreter_frame_mdx_addr() const;

  public:

   // Locals

   // The _at version returns a pointer because the address is used for GC.

   intptr_t* interpreter_frame_local_at(int index) const;

   void interpreter_frame_set_locals(intptr_t* locs);

   // byte code index/pointer (use these functions for unchecked frame access only!)

   intptr_t interpreter_frame_bcx() const                  { return *interpreter_frame_bcx_addr(); }

   void interpreter_frame_set_bcx(intptr_t bcx);

   // byte code index

   jint interpreter_frame_bci() const;

   void interpreter_frame_set_bci(jint bci);

   // byte code pointer

   address interpreter_frame_bcp() const;

   void    interpreter_frame_set_bcp(address bcp);

   // Unchecked access to the method data index/pointer.

   // Only use this if you know what you are doing.

   intptr_t interpreter_frame_mdx() const                  { return *interpreter_frame_mdx_addr(); }

   void interpreter_frame_set_mdx(intptr_t mdx);

   // method data pointer

   address interpreter_frame_mdp() const;

   void    interpreter_frame_set_mdp(address dp);

   // Find receiver out of caller's (compiled) argument list

   oop retrieve_receiver(RegisterMap *reg_map);

   // Return the monitor owner and BasicLock for compiled synchronized

   // native methods so that biased locking can revoke the receiver's

   // bias if necessary. Takes optional nmethod for this frame as

   // argument to avoid performing repeated lookups in code cache.

   BasicLock* compiled_synchronized_native_monitor      (nmethod* nm = NULL);

   oop        compiled_synchronized_native_monitor_owner(nmethod* nm = NULL);

   // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is

   // not setup)

   oop interpreter_callee_receiver(symbolHandle signature)     { return *interpreter_callee_receiver_addr(signature); }

   oop* interpreter_callee_receiver_addr(symbolHandle signature);

   // expression stack (may go up or down, direction == 1 or -1)

  public:

   intptr_t* interpreter_frame_expression_stack() const;

   static  jint  interpreter_frame_expression_stack_direction();

   // The _at version returns a pointer because the address is used for GC.

   intptr_t* interpreter_frame_expression_stack_at(jint offset) const;

   // top of expression stack

   intptr_t* interpreter_frame_tos_at(jint offset) const;

   intptr_t* interpreter_frame_tos_address() const;

   jint  interpreter_frame_expression_stack_size() const;

   intptr_t* interpreter_frame_sender_sp() const;

 #ifndef CC_INTERP

   // template based interpreter deoptimization support

   void  set_interpreter_frame_sender_sp(intptr_t* sender_sp);

   void interpreter_frame_set_monitor_end(BasicObjectLock* value);

 #endif // CC_INTERP

   // BasicObjectLocks:

   //

   // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end

   // Interpreter_frame_monitor_begin points to one element beyond the oldest one,

   // interpreter_frame_monitor_end   points to the youngest one, or if there are none,

   //                                 it points to one beyond where the first element will be.

   // interpreter_frame_monitor_size  reports the allocation size of a monitor in the interpreter stack.

   //                                 this value is >= BasicObjectLock::size(), and may be rounded up

   BasicObjectLock* interpreter_frame_monitor_begin() const;

   BasicObjectLock* interpreter_frame_monitor_end()   const;

   BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const;

   BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const;

   static int interpreter_frame_monitor_size();

   void interpreter_frame_verify_monitor(BasicObjectLock* value) const;

   // Tells whether the current interpreter_frame frame pointer

   // corresponds to the old compiled/deoptimized fp

   // The receiver used to be a top level frame

   bool interpreter_frame_equals_unpacked_fp(intptr_t* fp);

   // Return/result value from this interpreter frame

   // If the method return type is T_OBJECT or T_ARRAY populates oop_result

   // For other (non-T_VOID) the appropriate field in the jvalue is populated

   // with the result value.

   // Should only be called when at method exit when the method is not

   // exiting due to an exception.

   BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result);

  public:

   // Method & constant pool cache

   methodOop interpreter_frame_method() const;

   void interpreter_frame_set_method(methodOop method);

   methodOop* interpreter_frame_method_addr() const;

   constantPoolCacheOop* interpreter_frame_cache_addr() const;

 #ifdef PPC

   oop* interpreter_frame_mirror_addr() const;

 #endif

  public:

   // Entry frames

   JavaCallWrapper* entry_frame_call_wrapper() const;

   intptr_t* entry_frame_argument_at(int offset) const;

   // tells whether there is another chunk of Delta stack above

   bool entry_frame_is_first() const;

   // Compiled frames:

  public:

   // Given the index of a local, and the number of argument words

   // in this stack frame, tell which word of the stack frame to find

   // the local in.  Arguments are stored above the ofp/rpc pair,

   // while other locals are stored below it.

   // Since monitors (BasicLock blocks) are also assigned indexes,

   // but may have different storage requirements, their presence

   // can also affect the calculation of offsets.

   static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);

   // Given the index of a monitor, etc., tell which word of the

   // stack frame contains the start of the BasicLock block.

   // Note that the local index by convention is the __higher__

   // of the two indexes allocated to the block.

   static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);

   // Tell the smallest value that local_offset_for_compiler will attain.

   // This is used to help determine how much stack frame to allocate.

   static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors);

   // Tells if this register must be spilled during a call.

   // On Intel, all registers are smashed by calls.

   static bool volatile_across_calls(Register reg);

   // Safepoints

  public:

   oop saved_oop_result(RegisterMap* map) const;

   void set_saved_oop_result(RegisterMap* map, oop obj);

   // For debugging

  private:

   const char* print_name() const;

  public:

   void print_value() const { print_value_on(tty,NULL); }

   void print_value_on(outputStream* st, JavaThread *thread) const;

   void print_on(outputStream* st) const;

   void interpreter_frame_print_on(outputStream* st) const;

   void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const;

   // Conversion from an VMReg to physical stack location

   oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const;

   // Oops-do's

   void oops_compiled_arguments_do(symbolHandle signature, bool has_receiver, const RegisterMap* reg_map, OopClosure* f);

   void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true);

  private:

   void oops_interpreted_arguments_do(symbolHandle signature, bool has_receiver, OopClosure* f);

   // Iteration of oops

   void oops_do_internal(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map, bool use_interpreter_oop_map_cache);

   void oops_entry_do(OopClosure* f, const RegisterMap* map);

   void oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map);

   int adjust_offset(methodOop method, int index); // helper for above fn

  public:

   // Memory management

   void oops_do(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map) { oops_do_internal(f, cf, map, true); }

   void nmethods_do(CodeBlobClosure* cf);

   void gc_prologue();

   void gc_epilogue();

   void pd_gc_epilog();

 # ifdef ENABLE_ZAP_DEAD_LOCALS

  private:

   class CheckValueClosure: public OopClosure {

    public:

     void do_oop(oop* p);

     void do_oop(narrowOop* p) { ShouldNotReachHere(); }

   };

   static CheckValueClosure _check_value;

   class CheckOopClosure: public OopClosure {

    public:

     void do_oop(oop* p);

     void do_oop(narrowOop* p) { ShouldNotReachHere(); }

   };

   static CheckOopClosure _check_oop;

   static void check_derived_oop(oop* base, oop* derived);

   class ZapDeadClosure: public OopClosure {

    public:

     void do_oop(oop* p);

     void do_oop(narrowOop* p) { ShouldNotReachHere(); }

   };

   static ZapDeadClosure _zap_dead;

  public:

   // Zapping

   void zap_dead_locals            (JavaThread* thread, const RegisterMap* map);

   void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map);

   void zap_dead_compiled_locals   (JavaThread* thread, const RegisterMap* map);

   void zap_dead_entry_locals      (JavaThread* thread, const RegisterMap* map);

   void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map);

 # endif

   // Verification

   void verify(const RegisterMap* map);

   static bool verify_return_pc(address x);

   static bool is_bci(intptr_t bcx);

   // Usage:

   // assert(frame::verify_return_pc(return_address), "must be a return pc");

   int pd_oop_map_offset_adjustment() const;

 # include "incls/_frame_pd.hpp.incl"

 };

 //

 // StackFrameStream iterates through the frames of a thread starting from

 // top most frame. It automatically takes care of updating the location of

 // all (callee-saved) registers. Notice: If a thread is stopped at

 // a safepoint, all registers are saved, not only the callee-saved ones.

 //

 // Use:

 //

 //   for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) {

 //     ...

 //   }

 //

 class StackFrameStream : public StackObj {

  private:

   frame       _fr;

   RegisterMap _reg_map;

   bool        _is_done;

  public:

    StackFrameStream(JavaThread *thread, bool update = true);

   // Iteration

   bool is_done()                  { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); }

   void next()                     { if (!_is_done) _fr = _fr.sender(&_reg_map); }

   // Query

   frame *current()                { return &_fr; }

   RegisterMap* register_map()     { return &_reg_map; }

 };