--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/frame.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,469 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+typedef class BytecodeInterpreter* interpreterState;
+
+class CodeBlob;
+
+
+// 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() 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() 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, bool thread_is_known_safe = false);
+
+ // 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:
+ // Tags for TaggedStackInterpreter
+ enum Tag {
+ TagValue = 0, // Important: must be zero to use G0 on sparc.
+ TagReference = 0x555, // Reference type - is an oop that needs gc.
+ TagCategory2 = 0x666 // Only used internally by interpreter
+ // and not written to the java stack.
+ // The values above are chosen so that misuse causes a crash
+ // with a recognizable value.
+ };
+
+ static Tag tag_for_basic_type(BasicType typ) {
+ return (typ == T_OBJECT ? TagReference : TagValue);
+ }
+
+ // Locals
+
+ // The _at version returns a pointer because the address is used for GC.
+ intptr_t* interpreter_frame_local_at(int index) const;
+ Tag interpreter_frame_local_tag(int index) const;
+ void interpreter_frame_set_local_tag(int index, Tag tag) 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;
+ Tag interpreter_frame_expression_stack_tag(jint offset) const;
+ void interpreter_frame_set_expression_stack_tag(jint offset, Tag tag) 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;
+
+ 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 is_static, 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_locals_do(OopClosure *f,
+ int max_locals,
+ InterpreterOopMap *mask);
+ void oops_interpreted_expressions_do(OopClosure *f, symbolHandle signature,
+ bool is_static, int max_stack, int max_locals,
+ InterpreterOopMap *mask);
+ void oops_interpreted_arguments_do(symbolHandle signature, bool is_static, OopClosure* f);
+
+ // Iteration of oops
+ void oops_do_internal(OopClosure* f, RegisterMap* map, bool use_interpreter_oop_map_cache);
+ void oops_entry_do(OopClosure* f, const RegisterMap* map);
+ void oops_code_blob_do(OopClosure* f, const RegisterMap* map);
+ int adjust_offset(methodOop method, int index); // helper for above fn
+ // Iteration of nmethods
+ void nmethods_code_blob_do();
+ public:
+ // Memory management
+ void oops_do(OopClosure* f, RegisterMap* map) { oops_do_internal(f, map, true); }
+ void nmethods_do();
+
+ 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);
+ };
+ static CheckValueClosure _check_value;
+
+ class CheckOopClosure: public OopClosure {
+ public: void do_oop(oop* p);
+ };
+ static CheckOopClosure _check_oop;
+
+ static void check_derived_oop(oop* base, oop* derived);
+
+ class ZapDeadClosure: public OopClosure {
+ public: void do_oop(oop* p);
+ };
+ 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; }
+};