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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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typedef class BytecodeInterpreter* interpreterState;
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class CodeBlob;
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// A frame represents a physical stack frame (an activation). Frames
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// can be C or Java frames, and the Java frames can be interpreted or
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// compiled. In contrast, vframes represent source-level activations,
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// so that one physical frame can correspond to multiple source level
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// frames because of inlining.
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class frame VALUE_OBJ_CLASS_SPEC {
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private:
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// Instance variables:
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intptr_t* _sp; // stack pointer (from Thread::last_Java_sp)
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address _pc; // program counter (the next instruction after the call)
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CodeBlob* _cb; // CodeBlob that "owns" pc
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enum deopt_state {
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not_deoptimized,
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is_deoptimized,
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unknown
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};
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deopt_state _deopt_state;
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public:
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// Constructors
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frame();
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// Accessors
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// pc: Returns the pc at which this frame will continue normally.
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// It must point at the beginning of the next instruction to execute.
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address pc() const { return _pc; }
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// This returns the pc that if you were in the debugger you'd see. Not
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// the idealized value in the frame object. This undoes the magic conversion
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// that happens for deoptimized frames. In addition it makes the value the
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// hardware would want to see in the native frame. The only user (at this point)
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// is deoptimization. It likely no one else should ever use it.
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address raw_pc() const;
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void set_pc( address newpc );
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intptr_t* sp() const { return _sp; }
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void set_sp( intptr_t* newsp ) { _sp = newsp; }
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CodeBlob* cb() const { return _cb; }
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// patching operations
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void patch_pc(Thread* thread, address pc);
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// Every frame needs to return a unique id which distinguishes it from all other frames.
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// For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames
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// will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame
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// should have an id() of NULL so it is a distinguishing value for an unmatchable frame.
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// We also have relationals which allow comparing a frame to anoth frame's id() allow
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// us to distinguish younger (more recent activation) from older (less recent activations)
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// A NULL id is only valid when comparing for equality.
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intptr_t* id(void) const;
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bool is_younger(intptr_t* id) const;
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bool is_older(intptr_t* id) const;
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// testers
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// Compares for strict equality. Rarely used or needed.
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// It can return a different result than f1.id() == f2.id()
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bool equal(frame other) const;
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// type testers
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bool is_interpreted_frame() const;
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bool is_java_frame() const;
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bool is_entry_frame() const; // Java frame called from C?
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bool is_native_frame() const;
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bool is_runtime_frame() const;
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bool is_compiled_frame() const;
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bool is_safepoint_blob_frame() const;
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bool is_deoptimized_frame() const;
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// testers
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bool is_first_frame() const; // oldest frame? (has no sender)
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bool is_first_java_frame() const; // same for Java frame
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bool is_interpreted_frame_valid() const; // performs sanity checks on interpreted frames.
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// tells whether this frame is marked for deoptimization
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bool should_be_deoptimized() const;
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// tells whether this frame can be deoptimized
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bool can_be_deoptimized() const;
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// returns the frame size in stack slots
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int frame_size() const;
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// returns the sending frame
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frame sender(RegisterMap* map) const;
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// for Profiling - acting on another frame. walks sender frames
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// if valid.
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frame profile_find_Java_sender_frame(JavaThread *thread);
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bool safe_for_sender(JavaThread *thread);
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// returns the sender, but skips conversion frames
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frame real_sender(RegisterMap* map) const;
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// returns the the sending Java frame, skipping any intermediate C frames
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// NB: receiver must not be first frame
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frame java_sender() const;
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private:
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// Helper methods for better factored code in frame::sender
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frame sender_for_compiled_frame(RegisterMap* map) const;
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frame sender_for_entry_frame(RegisterMap* map) const;
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frame sender_for_interpreter_frame(RegisterMap* map) const;
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frame sender_for_native_frame(RegisterMap* map) const;
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// All frames:
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// A low-level interface for vframes:
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public:
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intptr_t* addr_at(int index) const { return &fp()[index]; }
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intptr_t at(int index) const { return *addr_at(index); }
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// accessors for locals
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oop obj_at(int offset) const { return *obj_at_addr(offset); }
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void obj_at_put(int offset, oop value) { *obj_at_addr(offset) = value; }
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jint int_at(int offset) const { return *int_at_addr(offset); }
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void int_at_put(int offset, jint value) { *int_at_addr(offset) = value; }
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oop* obj_at_addr(int offset) const { return (oop*) addr_at(offset); }
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oop* adjusted_obj_at_addr(methodOop method, int index) { return obj_at_addr(adjust_offset(method, index)); }
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private:
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jint* int_at_addr(int offset) const { return (jint*) addr_at(offset); }
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public:
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// Link (i.e., the pointer to the previous frame)
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intptr_t* link() const;
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void set_link(intptr_t* addr);
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// Return address
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address sender_pc() const;
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// Support for deoptimization
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void deoptimize(JavaThread* thread, bool thread_is_known_safe = false);
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// The frame's original SP, before any extension by an interpreted callee;
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// used for packing debug info into vframeArray objects and vframeArray lookup.
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intptr_t* unextended_sp() const;
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// returns the stack pointer of the calling frame
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intptr_t* sender_sp() const;
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// Interpreter frames:
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private:
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intptr_t** interpreter_frame_locals_addr() const;
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intptr_t* interpreter_frame_bcx_addr() const;
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intptr_t* interpreter_frame_mdx_addr() const;
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public:
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// Tags for TaggedStackInterpreter
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enum Tag {
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TagValue = 0, // Important: must be zero to use G0 on sparc.
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TagReference = 0x555, // Reference type - is an oop that needs gc.
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TagCategory2 = 0x666 // Only used internally by interpreter
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// and not written to the java stack.
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// The values above are chosen so that misuse causes a crash
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// with a recognizable value.
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};
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static Tag tag_for_basic_type(BasicType typ) {
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return (typ == T_OBJECT ? TagReference : TagValue);
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}
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// Locals
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// The _at version returns a pointer because the address is used for GC.
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intptr_t* interpreter_frame_local_at(int index) const;
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Tag interpreter_frame_local_tag(int index) const;
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void interpreter_frame_set_local_tag(int index, Tag tag) const;
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void interpreter_frame_set_locals(intptr_t* locs);
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// byte code index/pointer (use these functions for unchecked frame access only!)
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intptr_t interpreter_frame_bcx() const { return *interpreter_frame_bcx_addr(); }
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void interpreter_frame_set_bcx(intptr_t bcx);
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// byte code index
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jint interpreter_frame_bci() const;
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void interpreter_frame_set_bci(jint bci);
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// byte code pointer
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address interpreter_frame_bcp() const;
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void interpreter_frame_set_bcp(address bcp);
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// Unchecked access to the method data index/pointer.
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// Only use this if you know what you are doing.
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intptr_t interpreter_frame_mdx() const { return *interpreter_frame_mdx_addr(); }
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void interpreter_frame_set_mdx(intptr_t mdx);
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// method data pointer
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address interpreter_frame_mdp() const;
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void interpreter_frame_set_mdp(address dp);
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// Find receiver out of caller's (compiled) argument list
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oop retrieve_receiver(RegisterMap *reg_map);
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// Return the monitor owner and BasicLock for compiled synchronized
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// native methods so that biased locking can revoke the receiver's
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// bias if necessary. Takes optional nmethod for this frame as
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// argument to avoid performing repeated lookups in code cache.
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BasicLock* compiled_synchronized_native_monitor (nmethod* nm = NULL);
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oop compiled_synchronized_native_monitor_owner(nmethod* nm = NULL);
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// Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is
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// not setup)
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oop interpreter_callee_receiver(symbolHandle signature) { return *interpreter_callee_receiver_addr(signature); }
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oop *interpreter_callee_receiver_addr(symbolHandle signature);
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// expression stack (may go up or down, direction == 1 or -1)
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public:
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intptr_t* interpreter_frame_expression_stack() const;
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static jint interpreter_frame_expression_stack_direction();
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// The _at version returns a pointer because the address is used for GC.
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intptr_t* interpreter_frame_expression_stack_at(jint offset) const;
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Tag interpreter_frame_expression_stack_tag(jint offset) const;
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void interpreter_frame_set_expression_stack_tag(jint offset, Tag tag) const;
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// top of expression stack
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intptr_t* interpreter_frame_tos_at(jint offset) const;
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intptr_t* interpreter_frame_tos_address() const;
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jint interpreter_frame_expression_stack_size() const;
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intptr_t* interpreter_frame_sender_sp() const;
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#ifndef CC_INTERP
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// template based interpreter deoptimization support
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void set_interpreter_frame_sender_sp(intptr_t* sender_sp);
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void interpreter_frame_set_monitor_end(BasicObjectLock* value);
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#endif // CC_INTERP
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// BasicObjectLocks:
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//
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// interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end
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// Interpreter_frame_monitor_begin points to one element beyond the oldest one,
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// interpreter_frame_monitor_end points to the youngest one, or if there are none,
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// it points to one beyond where the first element will be.
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// interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack.
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// this value is >= BasicObjectLock::size(), and may be rounded up
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BasicObjectLock* interpreter_frame_monitor_begin() const;
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BasicObjectLock* interpreter_frame_monitor_end() const;
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BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const;
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BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const;
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static int interpreter_frame_monitor_size();
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void interpreter_frame_verify_monitor(BasicObjectLock* value) const;
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// Tells whether the current interpreter_frame frame pointer
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// corresponds to the old compiled/deoptimized fp
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// The receiver used to be a top level frame
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bool interpreter_frame_equals_unpacked_fp(intptr_t* fp);
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// Return/result value from this interpreter frame
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// If the method return type is T_OBJECT or T_ARRAY populates oop_result
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// For other (non-T_VOID) the appropriate field in the jvalue is populated
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// with the result value.
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// Should only be called when at method exit when the method is not
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// exiting due to an exception.
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BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result);
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public:
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// Method & constant pool cache
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methodOop interpreter_frame_method() const;
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void interpreter_frame_set_method(methodOop method);
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methodOop* interpreter_frame_method_addr() const;
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constantPoolCacheOop* interpreter_frame_cache_addr() const;
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public:
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// Entry frames
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JavaCallWrapper* entry_frame_call_wrapper() const;
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intptr_t* entry_frame_argument_at(int offset) const;
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// tells whether there is another chunk of Delta stack above
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bool entry_frame_is_first() const;
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// Compiled frames:
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public:
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// Given the index of a local, and the number of argument words
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// in this stack frame, tell which word of the stack frame to find
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// the local in. Arguments are stored above the ofp/rpc pair,
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// while other locals are stored below it.
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// Since monitors (BasicLock blocks) are also assigned indexes,
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// but may have different storage requirements, their presence
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// can also affect the calculation of offsets.
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static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);
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// Given the index of a monitor, etc., tell which word of the
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// stack frame contains the start of the BasicLock block.
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// Note that the local index by convention is the __higher__
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// of the two indexes allocated to the block.
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static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);
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// Tell the smallest value that local_offset_for_compiler will attain.
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// This is used to help determine how much stack frame to allocate.
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static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors);
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// Tells if this register must be spilled during a call.
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// On Intel, all registers are smashed by calls.
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static bool volatile_across_calls(Register reg);
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// Safepoints
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public:
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oop saved_oop_result(RegisterMap* map) const;
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void set_saved_oop_result(RegisterMap* map, oop obj);
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// For debugging
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private:
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const char* print_name() const;
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public:
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void print_value() const { print_value_on(tty,NULL); }
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void print_value_on(outputStream* st, JavaThread *thread) const;
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void print_on(outputStream* st) const;
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void interpreter_frame_print_on(outputStream* st) const;
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void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const;
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// Conversion from an VMReg to physical stack location
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oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const;
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// Oops-do's
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void oops_compiled_arguments_do(symbolHandle signature, bool is_static, const RegisterMap* reg_map, OopClosure* f);
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void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true);
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private:
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void oops_interpreted_locals_do(OopClosure *f,
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int max_locals,
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InterpreterOopMap *mask);
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void oops_interpreted_expressions_do(OopClosure *f, symbolHandle signature,
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bool is_static, int max_stack, int max_locals,
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InterpreterOopMap *mask);
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void oops_interpreted_arguments_do(symbolHandle signature, bool is_static, OopClosure* f);
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// Iteration of oops
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void oops_do_internal(OopClosure* f, RegisterMap* map, bool use_interpreter_oop_map_cache);
|
|
388 |
void oops_entry_do(OopClosure* f, const RegisterMap* map);
|
|
389 |
void oops_code_blob_do(OopClosure* f, const RegisterMap* map);
|
|
390 |
int adjust_offset(methodOop method, int index); // helper for above fn
|
|
391 |
// Iteration of nmethods
|
|
392 |
void nmethods_code_blob_do();
|
|
393 |
public:
|
|
394 |
// Memory management
|
|
395 |
void oops_do(OopClosure* f, RegisterMap* map) { oops_do_internal(f, map, true); }
|
|
396 |
void nmethods_do();
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|
397 |
|
|
398 |
void gc_prologue();
|
|
399 |
void gc_epilogue();
|
|
400 |
void pd_gc_epilog();
|
|
401 |
|
|
402 |
# ifdef ENABLE_ZAP_DEAD_LOCALS
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|
403 |
private:
|
|
404 |
class CheckValueClosure: public OopClosure {
|
|
405 |
public: void do_oop(oop* p);
|
|
406 |
};
|
|
407 |
static CheckValueClosure _check_value;
|
|
408 |
|
|
409 |
class CheckOopClosure: public OopClosure {
|
|
410 |
public: void do_oop(oop* p);
|
|
411 |
};
|
|
412 |
static CheckOopClosure _check_oop;
|
|
413 |
|
|
414 |
static void check_derived_oop(oop* base, oop* derived);
|
|
415 |
|
|
416 |
class ZapDeadClosure: public OopClosure {
|
|
417 |
public: void do_oop(oop* p);
|
|
418 |
};
|
|
419 |
static ZapDeadClosure _zap_dead;
|
|
420 |
|
|
421 |
public:
|
|
422 |
// Zapping
|
|
423 |
void zap_dead_locals (JavaThread* thread, const RegisterMap* map);
|
|
424 |
void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map);
|
|
425 |
void zap_dead_compiled_locals (JavaThread* thread, const RegisterMap* map);
|
|
426 |
void zap_dead_entry_locals (JavaThread* thread, const RegisterMap* map);
|
|
427 |
void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map);
|
|
428 |
# endif
|
|
429 |
// Verification
|
|
430 |
void verify(const RegisterMap* map);
|
|
431 |
static bool verify_return_pc(address x);
|
|
432 |
static bool is_bci(intptr_t bcx);
|
|
433 |
// Usage:
|
|
434 |
// assert(frame::verify_return_pc(return_address), "must be a return pc");
|
|
435 |
|
|
436 |
int pd_oop_map_offset_adjustment() const;
|
|
437 |
|
|
438 |
# include "incls/_frame_pd.hpp.incl"
|
|
439 |
};
|
|
440 |
|
|
441 |
|
|
442 |
//
|
|
443 |
// StackFrameStream iterates through the frames of a thread starting from
|
|
444 |
// top most frame. It automatically takes care of updating the location of
|
|
445 |
// all (callee-saved) registers. Notice: If a thread is stopped at
|
|
446 |
// a safepoint, all registers are saved, not only the callee-saved ones.
|
|
447 |
//
|
|
448 |
// Use:
|
|
449 |
//
|
|
450 |
// for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) {
|
|
451 |
// ...
|
|
452 |
// }
|
|
453 |
//
|
|
454 |
class StackFrameStream : public StackObj {
|
|
455 |
private:
|
|
456 |
frame _fr;
|
|
457 |
RegisterMap _reg_map;
|
|
458 |
bool _is_done;
|
|
459 |
public:
|
|
460 |
StackFrameStream(JavaThread *thread, bool update = true);
|
|
461 |
|
|
462 |
// Iteration
|
|
463 |
bool is_done() { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); }
|
|
464 |
void next() { if (!_is_done) _fr = _fr.sender(&_reg_map); }
|
|
465 |
|
|
466 |
// Query
|
|
467 |
frame *current() { return &_fr; }
|
|
468 |
RegisterMap* register_map() { return &_reg_map; }
|
|
469 |
};
|