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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// vframes are virtual stack frames representing source level activations.
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// A single frame may hold several source level activations in the case of
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// optimized code. The debugging stored with the optimized code enables
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// us to unfold a frame as a stack of vframes.
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// A cVFrame represents an activation of a non-java method.
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// The vframe inheritance hierarchy:
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// - vframe
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// - javaVFrame
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// - interpretedVFrame
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// - compiledVFrame ; (used for both compiled Java methods and native stubs)
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// - externalVFrame
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// - entryVFrame ; special frame created when calling Java from C
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// - BasicLock
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class vframe: public ResourceObj {
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protected:
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frame _fr; // Raw frame behind the virtual frame.
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RegisterMap _reg_map; // Register map for the raw frame (used to handle callee-saved registers).
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JavaThread* _thread; // The thread owning the raw frame.
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vframe(const frame* fr, const RegisterMap* reg_map, JavaThread* thread);
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vframe(const frame* fr, JavaThread* thread);
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public:
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// Factory method for creating vframes
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static vframe* new_vframe(const frame* f, const RegisterMap *reg_map, JavaThread* thread);
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// Accessors
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frame fr() const { return _fr; }
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CodeBlob* cb() const { return _fr.cb(); }
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nmethod* nm() const {
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assert( cb() != NULL && cb()->is_nmethod(), "usage");
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return (nmethod*) cb();
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}
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// ???? Does this need to be a copy?
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frame* frame_pointer() { return &_fr; }
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const RegisterMap* register_map() const { return &_reg_map; }
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JavaThread* thread() const { return _thread; }
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// Returns the sender vframe
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virtual vframe* sender() const;
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// Returns the next javaVFrame on the stack (skipping all other kinds of frame)
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javaVFrame *java_sender() const;
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// Answers if the this is the top vframe in the frame, i.e., if the sender vframe
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// is in the caller frame
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virtual bool is_top() const { return true; }
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// Returns top vframe within same frame (see is_top())
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virtual vframe* top() const;
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// Type testing operations
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virtual bool is_entry_frame() const { return false; }
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virtual bool is_java_frame() const { return false; }
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virtual bool is_interpreted_frame() const { return false; }
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virtual bool is_compiled_frame() const { return false; }
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#ifndef PRODUCT
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// printing operations
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virtual void print_value() const;
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virtual void print();
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#endif
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};
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class javaVFrame: public vframe {
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public:
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// JVM state
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virtual methodOop method() const = 0;
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virtual int bci() const = 0;
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virtual StackValueCollection* locals() const = 0;
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virtual StackValueCollection* expressions() const = 0;
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// the order returned by monitors() is from oldest -> youngest#4418568
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virtual GrowableArray<MonitorInfo*>* monitors() const = 0;
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// Debugging support via JVMTI.
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// NOTE that this is not guaranteed to give correct results for compiled vframes.
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// Deoptimize first if necessary.
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virtual void set_locals(StackValueCollection* values) const = 0;
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// Test operation
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bool is_java_frame() const { return true; }
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protected:
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javaVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : vframe(fr, reg_map, thread) {}
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javaVFrame(const frame* fr, JavaThread* thread) : vframe(fr, thread) {}
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public:
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// casting
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static javaVFrame* cast(vframe* vf) {
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assert(vf == NULL || vf->is_java_frame(), "must be java frame");
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return (javaVFrame*) vf;
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}
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// Return an array of monitors locked by this frame in the youngest to oldest order
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GrowableArray<MonitorInfo*>* locked_monitors();
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// printing used during stack dumps
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void print_lock_info_on(outputStream* st, int frame_count);
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void print_lock_info(int frame_count) { print_lock_info_on(tty, frame_count); }
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#ifndef PRODUCT
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public:
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// printing operations
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void print();
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void print_value() const;
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void print_activation(int index) const;
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// verify operations
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virtual void verify() const;
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// Structural compare
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bool structural_compare(javaVFrame* other);
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#endif
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friend class vframe;
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};
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class interpretedVFrame: public javaVFrame {
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public:
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// JVM state
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methodOop method() const;
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int bci() const;
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StackValueCollection* locals() const;
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StackValueCollection* expressions() const;
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GrowableArray<MonitorInfo*>* monitors() const;
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void set_locals(StackValueCollection* values) const;
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// Test operation
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bool is_interpreted_frame() const { return true; }
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protected:
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interpretedVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : javaVFrame(fr, reg_map, thread) {};
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public:
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// Accessors for Byte Code Pointer
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u_char* bcp() const;
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void set_bcp(u_char* bcp);
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// casting
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static interpretedVFrame* cast(vframe* vf) {
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assert(vf == NULL || vf->is_interpreted_frame(), "must be interpreted frame");
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return (interpretedVFrame*) vf;
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}
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private:
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static const int bcp_offset;
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intptr_t* locals_addr_at(int offset) const;
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// returns where the parameters starts relative to the frame pointer
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int start_of_parameters() const;
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#ifndef PRODUCT
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public:
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// verify operations
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void verify() const;
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#endif
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friend class vframe;
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};
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class externalVFrame: public vframe {
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protected:
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externalVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : vframe(fr, reg_map, thread) {}
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#ifndef PRODUCT
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public:
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// printing operations
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void print_value() const;
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void print();
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#endif
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friend class vframe;
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};
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class entryVFrame: public externalVFrame {
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public:
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bool is_entry_frame() const { return true; }
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protected:
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entryVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread);
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public:
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// casting
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static entryVFrame* cast(vframe* vf) {
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assert(vf == NULL || vf->is_entry_frame(), "must be entry frame");
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return (entryVFrame*) vf;
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}
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#ifndef PRODUCT
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public:
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// printing
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void print_value() const;
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void print();
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#endif
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friend class vframe;
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};
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// A MonitorInfo is a ResourceObject that describes a the pair:
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// 1) the owner of the monitor
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// 2) the monitor lock
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class MonitorInfo : public ResourceObj {
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private:
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oop _owner; // the object owning the monitor
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BasicLock* _lock;
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public:
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// Constructor
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MonitorInfo(oop owner, BasicLock* lock) {
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_owner = owner;
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_lock = lock;
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}
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// Accessors
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oop owner() const { return _owner; }
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BasicLock* lock() const { return _lock; }
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};
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class vframeStreamCommon : StackObj {
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protected:
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// common
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frame _frame;
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JavaThread* _thread;
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RegisterMap _reg_map;
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enum { interpreted_mode, compiled_mode, at_end_mode } _mode;
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int _sender_decode_offset;
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// Cached information
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methodOop _method;
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int _bci;
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// Should VM activations be ignored or not
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bool _stop_at_java_call_stub;
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bool fill_in_compiled_inlined_sender();
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void fill_from_compiled_frame(int decode_offset);
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void fill_from_compiled_native_frame();
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void found_bad_method_frame();
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void fill_from_interpreter_frame();
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bool fill_from_frame();
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// Helper routine for security_get_caller_frame
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void skip_prefixed_method_and_wrappers();
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public:
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// Constructor
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vframeStreamCommon(JavaThread* thread) : _reg_map(thread, false) {
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_thread = thread;
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}
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// Accessors
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methodOop method() const { return _method; }
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int bci() const { return _bci; }
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intptr_t* frame_id() const { return _frame.id(); }
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address frame_pc() const { return _frame.pc(); }
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CodeBlob* cb() const { return _frame.cb(); }
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nmethod* nm() const {
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assert( cb() != NULL && cb()->is_nmethod(), "usage");
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return (nmethod*) cb();
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}
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// Frame type
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bool is_interpreted_frame() const { return _frame.is_interpreted_frame(); }
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bool is_entry_frame() const { return _frame.is_entry_frame(); }
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// Iteration
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void next() {
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// handle frames with inlining
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if (_mode == compiled_mode && fill_in_compiled_inlined_sender()) return;
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// handle general case
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do {
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_frame = _frame.sender(&_reg_map);
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} while (!fill_from_frame());
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}
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bool at_end() const { return _mode == at_end_mode; }
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// Implements security traversal. Skips depth no. of frame including
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// special security frames and prefixed native methods
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void security_get_caller_frame(int depth);
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// Helper routine for JVM_LatestUserDefinedLoader -- needed for 1.4
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// reflection implementation
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void skip_reflection_related_frames();
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};
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class vframeStream : public vframeStreamCommon {
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public:
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// Constructors
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vframeStream(JavaThread* thread, bool stop_at_java_call_stub = false)
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: vframeStreamCommon(thread) {
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_stop_at_java_call_stub = stop_at_java_call_stub;
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if (!thread->has_last_Java_frame()) {
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_mode = at_end_mode;
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return;
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}
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_frame = _thread->last_frame();
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while (!fill_from_frame()) {
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_frame = _frame.sender(&_reg_map);
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}
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}
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// top_frame may not be at safepoint, start with sender
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vframeStream(JavaThread* thread, frame top_frame, bool stop_at_java_call_stub = false);
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};
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inline bool vframeStreamCommon::fill_in_compiled_inlined_sender() {
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if (_sender_decode_offset == DebugInformationRecorder::serialized_null) {
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return false;
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}
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fill_from_compiled_frame(_sender_decode_offset);
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return true;
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}
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inline void vframeStreamCommon::fill_from_compiled_frame(int decode_offset) {
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_mode = compiled_mode;
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// Range check to detect ridiculous offsets.
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if (decode_offset == DebugInformationRecorder::serialized_null ||
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decode_offset < 0 ||
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decode_offset >= nm()->scopes_data_size()) {
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// 6379830 AsyncGetCallTrace sometimes feeds us wild frames.
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// If we attempt to read nmethod::scopes_data at serialized_null (== 0),
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// or if we read some at other crazy offset,
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// we will decode garbage and make wild references into the heap,
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// leading to crashes in product mode.
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// (This isn't airtight, of course, since there are internal
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// offsets which are also crazy.)
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#ifdef ASSERT
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if (WizardMode) {
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tty->print_cr("Error in fill_from_frame: pc_desc for "
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INTPTR_FORMAT " not found or invalid at %d",
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_frame.pc(), decode_offset);
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nm()->print();
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nm()->method()->print_codes();
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nm()->print_code();
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nm()->print_pcs();
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}
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#endif
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// Provide a cheap fallback in product mode. (See comment above.)
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found_bad_method_frame();
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fill_from_compiled_native_frame();
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return;
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}
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// Decode first part of scopeDesc
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DebugInfoReadStream buffer(nm(), decode_offset);
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_sender_decode_offset = buffer.read_int();
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_method = methodOop(buffer.read_oop());
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_bci = buffer.read_bci();
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assert(_method->is_method(), "checking type of decoded method");
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}
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// The native frames are handled specially. We do not rely on ScopeDesc info
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// since the pc might not be exact due to the _last_native_pc trick.
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inline void vframeStreamCommon::fill_from_compiled_native_frame() {
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_mode = compiled_mode;
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_sender_decode_offset = DebugInformationRecorder::serialized_null;
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_method = nm()->method();
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_bci = 0;
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}
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inline bool vframeStreamCommon::fill_from_frame() {
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// Interpreted frame
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if (_frame.is_interpreted_frame()) {
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fill_from_interpreter_frame();
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return true;
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}
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// Compiled frame
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if (cb() != NULL && cb()->is_nmethod()) {
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if (nm()->is_native_method()) {
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// Do not rely on scopeDesc since the pc might be unprecise due to the _last_native_pc trick.
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fill_from_compiled_native_frame();
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} else {
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PcDesc* pc_desc = nm()->pc_desc_at(_frame.pc());
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int decode_offset;
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if (pc_desc == NULL) {
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// Should not happen, but let fill_from_compiled_frame handle it.
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decode_offset = DebugInformationRecorder::serialized_null;
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} else {
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decode_offset = pc_desc->scope_decode_offset();
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}
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fill_from_compiled_frame(decode_offset);
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}
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return true;
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}
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// End of stack?
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426 |
if (_frame.is_first_frame() || (_stop_at_java_call_stub && _frame.is_entry_frame())) {
|
|
427 |
_mode = at_end_mode;
|
|
428 |
return true;
|
|
429 |
}
|
|
430 |
|
|
431 |
return false;
|
|
432 |
}
|
|
433 |
|
|
434 |
|
|
435 |
inline void vframeStreamCommon::fill_from_interpreter_frame() {
|
|
436 |
methodOop method = _frame.interpreter_frame_method();
|
|
437 |
intptr_t bcx = _frame.interpreter_frame_bcx();
|
|
438 |
int bci = method->validate_bci_from_bcx(bcx);
|
|
439 |
// 6379830 AsyncGetCallTrace sometimes feeds us wild frames.
|
|
440 |
if (bci < 0) {
|
|
441 |
found_bad_method_frame();
|
|
442 |
bci = 0; // pretend it's on the point of entering
|
|
443 |
}
|
|
444 |
_mode = interpreted_mode;
|
|
445 |
_method = method;
|
|
446 |
_bci = bci;
|
|
447 |
}
|