jdk8-mips64-public/hotspot: src/share/vm/runtime/vframe.hpp@eef07cd490d4 (annotated)

src/share/vm/runtime/vframe.hpp@eef07cd490d4 (annotated)

src/share/vm/runtime/vframe.hpp

Wed, 03 Jul 2019 20:42:37 +0800

author: aoqi
date: Wed, 03 Jul 2019 20:42:37 +0800
changeset 9637: eef07cd490d4
parent 7994: 04ff2f6cd0eb
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1997, 2014, 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_RUNTIME_VFRAME_HPP
 #define SHARE_VM_RUNTIME_VFRAME_HPP
 #include "code/debugInfo.hpp"
 #include "code/debugInfoRec.hpp"
 #include "code/location.hpp"
 #include "oops/oop.hpp"
 #include "runtime/frame.hpp"
 #include "runtime/frame.inline.hpp"
 #include "runtime/stackValue.hpp"
 #include "runtime/stackValueCollection.hpp"
 #include "utilities/growableArray.hpp"
 // vframes are virtual stack frames representing source level activations.
 // A single frame may hold several source level activations in the case of
 // optimized code. The debugging stored with the optimized code enables
 // us to unfold a frame as a stack of vframes.
 // A cVFrame represents an activation of a non-java method.
 // The vframe inheritance hierarchy:
 // - vframe
 //   - javaVFrame
 //     - interpretedVFrame
 //     - compiledVFrame     ; (used for both compiled Java methods and native stubs)
 //   - externalVFrame
 //     - entryVFrame        ; special frame created when calling Java from C
 // - BasicLock
 class vframe: public ResourceObj {
  protected:
   frame        _fr;      // Raw frame behind the virtual frame.
   RegisterMap  _reg_map; // Register map for the raw frame (used to handle callee-saved registers).
   JavaThread*  _thread;  // The thread owning the raw frame.
   vframe(const frame* fr, const RegisterMap* reg_map, JavaThread* thread);
   vframe(const frame* fr, JavaThread* thread);
  public:
   // Factory method for creating vframes
   static vframe* new_vframe(const frame* f, const RegisterMap *reg_map, JavaThread* thread);
   // Accessors
   frame              fr()           const { return _fr;       }
   CodeBlob*          cb()         const { return _fr.cb();  }
   nmethod*           nm()         const {
       assert( cb() != NULL && cb()->is_nmethod(), "usage");
       return (nmethod*) cb();
   }
 // ???? Does this need to be a copy?
   frame*             frame_pointer() { return &_fr;       }
   const RegisterMap* register_map() const { return &_reg_map; }
   JavaThread*        thread()       const { return _thread;   }
   // Returns the sender vframe
   virtual vframe* sender() const;
   // Returns the next javaVFrame on the stack (skipping all other kinds of frame)
   javaVFrame *java_sender() const;
   // Answers if the this is the top vframe in the frame, i.e., if the sender vframe
   // is in the caller frame
   virtual bool is_top() const { return true; }
   // Returns top vframe within same frame (see is_top())
   virtual vframe* top() const;
   // Type testing operations
   virtual bool is_entry_frame()       const { return false; }
   virtual bool is_java_frame()        const { return false; }
   virtual bool is_interpreted_frame() const { return false; }
   virtual bool is_compiled_frame()    const { return false; }
 #ifndef PRODUCT
   // printing operations
   virtual void print_value() const;
   virtual void print();
 #endif
 };
 class javaVFrame: public vframe {
  public:
   // JVM state
   virtual Method*                      method()         const = 0;
   virtual int                          bci()            const = 0;
   virtual StackValueCollection*        locals()         const = 0;
   virtual StackValueCollection*        expressions()    const = 0;
   // the order returned by monitors() is from oldest -> youngest#4418568
   virtual GrowableArray<MonitorInfo*>* monitors()       const = 0;
   // Debugging support via JVMTI.
   // NOTE that this is not guaranteed to give correct results for compiled vframes.
   // Deoptimize first if necessary.
   virtual void set_locals(StackValueCollection* values) const = 0;
   // Test operation
   bool is_java_frame() const { return true; }
  protected:
   javaVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : vframe(fr, reg_map, thread) {}
   javaVFrame(const frame* fr, JavaThread* thread) : vframe(fr, thread) {}
  public:
   // casting
   static javaVFrame* cast(vframe* vf) {
     assert(vf == NULL || vf->is_java_frame(), "must be java frame");
     return (javaVFrame*) vf;
   }
   // Return an array of monitors locked by this frame in the youngest to oldest order
   GrowableArray<MonitorInfo*>* locked_monitors();
   // printing used during stack dumps
   void print_lock_info_on(outputStream* st, int frame_count);
   void print_lock_info(int frame_count) { print_lock_info_on(tty, frame_count); }
 #ifndef PRODUCT
  public:
   // printing operations
   void print();
   void print_value() const;
   void print_activation(int index) const;
   // verify operations
   virtual void verify() const;
   // Structural compare
   bool structural_compare(javaVFrame* other);
 #endif
   friend class vframe;
 };
 class interpretedVFrame: public javaVFrame {
  public:
   // JVM state
   Method*                      method()         const;
   int                          bci()            const;
   StackValueCollection*        locals()         const;
   StackValueCollection*        expressions()    const;
   GrowableArray<MonitorInfo*>* monitors()       const;
   void set_locals(StackValueCollection* values) const;
   // Test operation
   bool is_interpreted_frame() const { return true; }
  protected:
   interpretedVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : javaVFrame(fr, reg_map, thread) {};
  public:
   // Accessors for Byte Code Pointer
   u_char* bcp() const;
   void set_bcp(u_char* bcp);
   // casting
   static interpretedVFrame* cast(vframe* vf) {
     assert(vf == NULL || vf->is_interpreted_frame(), "must be interpreted frame");
     return (interpretedVFrame*) vf;
   }
  private:
   static const int bcp_offset;
   intptr_t* locals_addr_at(int offset) const;
   StackValueCollection* stack_data(bool expressions) const;
   // returns where the parameters starts relative to the frame pointer
   int start_of_parameters() const;
 #ifndef PRODUCT
  public:
   // verify operations
   void verify() const;
 #endif
   friend class vframe;
 };
 class externalVFrame: public vframe {
  protected:
   externalVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : vframe(fr, reg_map, thread) {}
 #ifndef PRODUCT
  public:
   // printing operations
   void print_value() const;
   void print();
 #endif
   friend class vframe;
 };
 class entryVFrame: public externalVFrame {
  public:
   bool is_entry_frame() const { return true; }
  protected:
   entryVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread);
  public:
   // casting
   static entryVFrame* cast(vframe* vf) {
     assert(vf == NULL || vf->is_entry_frame(), "must be entry frame");
     return (entryVFrame*) vf;
   }
 #ifndef PRODUCT
  public:
   // printing
   void print_value() const;
   void print();
 #endif
   friend class vframe;
 };
 // A MonitorInfo is a ResourceObject that describes a the pair:
 // 1) the owner of the monitor
 // 2) the monitor lock
 class MonitorInfo : public ResourceObj {
  private:
   oop        _owner; // the object owning the monitor
   BasicLock* _lock;
   oop        _owner_klass; // klass (mirror) if owner was scalar replaced
   bool       _eliminated;
   bool       _owner_is_scalar_replaced;
  public:
   // Constructor
   MonitorInfo(oop owner, BasicLock* lock, bool eliminated, bool owner_is_scalar_replaced) {
     if (!owner_is_scalar_replaced) {
       _owner = owner;
       _owner_klass = NULL;
     } else {
       assert(eliminated, "monitor should be eliminated for scalar replaced object");
       _owner = NULL;
       _owner_klass = owner;
     }
     _lock  = lock;
     _eliminated = eliminated;
     _owner_is_scalar_replaced = owner_is_scalar_replaced;
   }
   // Accessors
   oop        owner() const {
     assert(!_owner_is_scalar_replaced, "should not be called for scalar replaced object");
     return _owner;
   }
   oop   owner_klass() const {
     assert(_owner_is_scalar_replaced, "should not be called for not scalar replaced object");
     return _owner_klass;
   }
   BasicLock* lock()  const { return _lock;  }
   bool eliminated()  const { return _eliminated; }
   bool owner_is_scalar_replaced()  const { return _owner_is_scalar_replaced; }
 };
 class vframeStreamCommon : StackObj {
  protected:
   // common
   frame        _frame;
   JavaThread*  _thread;
   RegisterMap  _reg_map;
   enum { interpreted_mode, compiled_mode, at_end_mode } _mode;
   int _sender_decode_offset;
   // Cached information
   Method* _method;
   int       _bci;
   // Should VM activations be ignored or not
   bool _stop_at_java_call_stub;
   bool fill_in_compiled_inlined_sender();
   void fill_from_compiled_frame(int decode_offset);
   void fill_from_compiled_native_frame();
   void found_bad_method_frame();
   void fill_from_interpreter_frame();
   bool fill_from_frame();
   // Helper routine for security_get_caller_frame
   void skip_prefixed_method_and_wrappers();
  public:
   // Constructor
   vframeStreamCommon(JavaThread* thread) : _reg_map(thread, false) {
     _thread = thread;
   }
   // Accessors
   Method* method() const { return _method; }
   int bci() const { return _bci; }
   intptr_t* frame_id() const { return _frame.id(); }
   address frame_pc() const { return _frame.pc(); }
   CodeBlob*          cb()         const { return _frame.cb();  }
   nmethod*           nm()         const {
       assert( cb() != NULL && cb()->is_nmethod(), "usage");
       return (nmethod*) cb();
   }
   // Frame type
   bool is_interpreted_frame() const { return _frame.is_interpreted_frame(); }
   bool is_entry_frame() const       { return _frame.is_entry_frame(); }
   // Iteration
   void next() {
     // handle frames with inlining
     if (_mode == compiled_mode    && fill_in_compiled_inlined_sender()) return;
     // handle general case
     do {
       _frame = _frame.sender(&_reg_map);
     } while (!fill_from_frame());
   }
   void security_next();
   bool at_end() const { return _mode == at_end_mode; }
   // Implements security traversal. Skips depth no. of frame including
   // special security frames and prefixed native methods
   void security_get_caller_frame(int depth);
   // Helper routine for JVM_LatestUserDefinedLoader -- needed for 1.4
   // reflection implementation
   void skip_reflection_related_frames();
 };
 class vframeStream : public vframeStreamCommon {
  public:
   // Constructors
   vframeStream(JavaThread* thread, bool stop_at_java_call_stub = false)
     : vframeStreamCommon(thread) {
     _stop_at_java_call_stub = stop_at_java_call_stub;
     if (!thread->has_last_Java_frame()) {
       _mode = at_end_mode;
       return;
     }
     _frame = _thread->last_frame();
     while (!fill_from_frame()) {
       _frame = _frame.sender(&_reg_map);
     }
   }
   // top_frame may not be at safepoint, start with sender
   vframeStream(JavaThread* thread, frame top_frame, bool stop_at_java_call_stub = false);
 };
 inline bool vframeStreamCommon::fill_in_compiled_inlined_sender() {
   if (_sender_decode_offset == DebugInformationRecorder::serialized_null) {
     return false;
   }
   fill_from_compiled_frame(_sender_decode_offset);
   return true;
 }
 inline void vframeStreamCommon::fill_from_compiled_frame(int decode_offset) {
   _mode = compiled_mode;
   // Range check to detect ridiculous offsets.
   if (decode_offset == DebugInformationRecorder::serialized_null ||
       decode_offset < 0 ||
       decode_offset >= nm()->scopes_data_size()) {
     // 6379830 AsyncGetCallTrace sometimes feeds us wild frames.
     // If we read nmethod::scopes_data at serialized_null (== 0)
     // or if read some at other invalid offset, invalid values will be decoded.
     // Based on these values, invalid heap locations could be referenced
     // that could lead to crashes in product mode.
     // Therefore, do not use the decode offset if invalid, but fill the frame
     // as it were a native compiled frame (no Java-level assumptions).
 #ifdef ASSERT
     if (WizardMode) {
       tty->print_cr("Error in fill_from_frame: pc_desc for "
                     INTPTR_FORMAT " not found or invalid at %d",
                     p2i(_frame.pc()), decode_offset);
       nm()->print();
       nm()->method()->print_codes();
       nm()->print_code();
       nm()->print_pcs();
     }
 #endif
     // Provide a cheap fallback in product mode.  (See comment above.)
     found_bad_method_frame();
     fill_from_compiled_native_frame();
     return;
   }
   // Decode first part of scopeDesc
   DebugInfoReadStream buffer(nm(), decode_offset);
   _sender_decode_offset = buffer.read_int();
   _method               = buffer.read_method();
   _bci                  = buffer.read_bci();
   assert(_method->is_method(), "checking type of decoded method");
 }
 // The native frames are handled specially. We do not rely on ScopeDesc info
 // since the pc might not be exact due to the _last_native_pc trick.
 inline void vframeStreamCommon::fill_from_compiled_native_frame() {
   _mode = compiled_mode;
   _sender_decode_offset = DebugInformationRecorder::serialized_null;
   _method = nm()->method();
   _bci = 0;
 }
 inline bool vframeStreamCommon::fill_from_frame() {
   // Interpreted frame
   if (_frame.is_interpreted_frame()) {
     fill_from_interpreter_frame();
     return true;
   }
   // Compiled frame
   if (cb() != NULL && cb()->is_nmethod()) {
     if (nm()->is_native_method()) {
       // Do not rely on scopeDesc since the pc might be unprecise due to the _last_native_pc trick.
       fill_from_compiled_native_frame();
     } else {
       PcDesc* pc_desc = nm()->pc_desc_at(_frame.pc());
       int decode_offset;
       if (pc_desc == NULL) {
         // Should not happen, but let fill_from_compiled_frame handle it.
         // If we are trying to walk the stack of a thread that is not
         // at a safepoint (like AsyncGetCallTrace would do) then this is an
         // acceptable result. [ This is assuming that safe_for_sender
         // is so bullet proof that we can trust the frames it produced. ]
         //
         // So if we see that the thread is not safepoint safe
         // then simply produce the method and a bci of zero
         // and skip the possibility of decoding any inlining that
         // may be present. That is far better than simply stopping (or
         // asserting. If however the thread is safepoint safe this
         // is the sign of a compiler bug  and we'll let
         // fill_from_compiled_frame handle it.
         JavaThreadState state = _thread->thread_state();
         // in_Java should be good enough to test safepoint safety
         // if state were say in_Java_trans then we'd expect that
         // the pc would have already been slightly adjusted to
         // one that would produce a pcDesc since the trans state
         // would be one that might in fact anticipate a safepoint
         if (state == _thread_in_Java ) {
           // This will get a method a zero bci and no inlining.
           // Might be nice to have a unique bci to signify this
           // particular case but for now zero will do.
           fill_from_compiled_native_frame();
           // There is something to be said for setting the mode to
           // at_end_mode to prevent trying to walk further up the
           // stack. There is evidence that if we walk any further
           // that we could produce a bad stack chain. However until
           // we see evidence that allowing this causes us to find
           // frames bad enough to cause segv's or assertion failures
           // we don't do it as while we may get a bad call chain the
           // probability is much higher (several magnitudes) that we
           // get good data.
           return true;
         }
         decode_offset = DebugInformationRecorder::serialized_null;
       } else {
         decode_offset = pc_desc->scope_decode_offset();
       }
       fill_from_compiled_frame(decode_offset);
     }
     return true;
   }
   // End of stack?
   if (_frame.is_first_frame() || (_stop_at_java_call_stub && _frame.is_entry_frame())) {
     _mode = at_end_mode;
     return true;
   }
   return false;
 }
 inline void vframeStreamCommon::fill_from_interpreter_frame() {
   Method* method = _frame.interpreter_frame_method();
   intptr_t  bcx    = _frame.interpreter_frame_bcx();
   int       bci    = method->validate_bci_from_bcx(bcx);
   // 6379830 AsyncGetCallTrace sometimes feeds us wild frames.
   // AsyncGetCallTrace interrupts the VM asynchronously. As a result
   // it is possible to access an interpreter frame for which
   // no Java-level information is yet available (e.g., becasue
   // the frame was being created when the VM interrupted it).
   // In this scenario, pretend that the interpreter is at the point
   // of entering the method.
   if (bci < 0) {
     found_bad_method_frame();
     bci = 0;
   }
   _mode   = interpreted_mode;
   _method = method;
   _bci    = bci;
 }
 #endif // SHARE_VM_RUNTIME_VFRAME_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/vframe.hpp@eef07cd490d4 (annotated)

src/share/vm/runtime/vframe.hpp