Mercurial > hg > truffle
diff src/share/vm/runtime/vframe.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | d3cd40645d0d |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/vframe.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,447 @@ +/* + * 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. + * + */ + +// 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 methodOop 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 + methodOop 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; + + // 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; + public: + // Constructor + MonitorInfo(oop owner, BasicLock* lock) { + _owner = owner; + _lock = lock; + } + // Accessors + oop owner() const { return _owner; } + BasicLock* lock() const { return _lock; } +}; + +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 + methodOop _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 + methodOop 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()); + } + + 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 attempt to read nmethod::scopes_data at serialized_null (== 0), + // or if we read some at other crazy offset, + // we will decode garbage and make wild references into the heap, + // leading to crashes in product mode. + // (This isn't airtight, of course, since there are internal + // offsets which are also crazy.) +#ifdef ASSERT + if (WizardMode) { + tty->print_cr("Error in fill_from_frame: pc_desc for " + INTPTR_FORMAT " not found or invalid at %d", + _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 = methodOop(buffer.read_oop()); + _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. + 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() { + methodOop 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. + if (bci < 0) { + found_bad_method_frame(); + bci = 0; // pretend it's on the point of entering + } + _mode = interpreted_mode; + _method = method; + _bci = bci; +}