/* * Copyright 1998-2009 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. * */ // CodeBlob - superclass for all entries in the CodeCache. // // Suptypes are: // nmethod : Compiled Java methods (include method that calls to native code) // RuntimeStub : Call to VM runtime methods // DeoptimizationBlob : Used for deoptimizatation // ExceptionBlob : Used for stack unrolling // SafepointBlob : Used to handle illegal instruction exceptions // // // Layout: // - header // - relocation // - instruction space // - data space class DeoptimizationBlob; class CodeBlob VALUE_OBJ_CLASS_SPEC { friend class VMStructs; private: const char* _name; int _size; // total size of CodeBlob in bytes int _header_size; // size of header (depends on subclass) int _relocation_size; // size of relocation int _instructions_offset; // offset to where instructions region begins int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have // not finished setting up their frame. Beware of pc's in // that range. There is a similar range(s) on returns // which we don't detect. int _data_offset; // offset to where data region begins int _oops_offset; // offset to where embedded oop table begins (inside data) int _oops_length; // number of embedded oops int _frame_size; // size of stack frame OopMapSet* _oop_maps; // OopMap for this CodeBlob CodeComments _comments; friend class OopRecorder; void fix_oop_relocations(address begin, address end, bool initialize_immediates); inline void initialize_immediate_oop(oop* dest, jobject handle); public: // Returns the space needed for CodeBlob static unsigned int allocation_size(CodeBuffer* cb, int header_size); // Creation // a) simple CodeBlob // frame_complete is the offset from the beginning of the instructions // to where the frame setup (from stackwalk viewpoint) is complete. CodeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size); // b) full CodeBlob CodeBlob( const char* name, CodeBuffer* cb, int header_size, int size, int frame_complete, int frame_size, OopMapSet* oop_maps ); // Deletion void flush(); // Typing virtual bool is_buffer_blob() const { return false; } virtual bool is_nmethod() const { return false; } virtual bool is_runtime_stub() const { return false; } virtual bool is_deoptimization_stub() const { return false; } virtual bool is_uncommon_trap_stub() const { return false; } virtual bool is_exception_stub() const { return false; } virtual bool is_safepoint_stub() const { return false; } virtual bool is_adapter_blob() const { return false; } virtual bool is_compiled_by_c2() const { return false; } virtual bool is_compiled_by_c1() const { return false; } // Casting nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; } // Boundaries address header_begin() const { return (address) this; } address header_end() const { return ((address) this) + _header_size; }; relocInfo* relocation_begin() const { return (relocInfo*) header_end(); }; relocInfo* relocation_end() const { return (relocInfo*)(header_end() + _relocation_size); } address instructions_begin() const { return (address) header_begin() + _instructions_offset; } address instructions_end() const { return (address) header_begin() + _data_offset; } address data_begin() const { return (address) header_begin() + _data_offset; } address data_end() const { return (address) header_begin() + _size; } oop* oops_begin() const { return (oop*) (header_begin() + _oops_offset); } oop* oops_end() const { return oops_begin() + _oops_length; } // Offsets int relocation_offset() const { return _header_size; } int instructions_offset() const { return _instructions_offset; } int data_offset() const { return _data_offset; } int oops_offset() const { return _oops_offset; } // Sizes int size() const { return _size; } int header_size() const { return _header_size; } int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); } int instructions_size() const { return instructions_end() - instructions_begin(); } int data_size() const { return data_end() - data_begin(); } int oops_size() const { return (address) oops_end() - (address) oops_begin(); } // Containment bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); } bool relocation_contains(relocInfo* addr) const{ return relocation_begin() <= addr && addr < relocation_end(); } bool instructions_contains(address addr) const { return instructions_begin() <= addr && addr < instructions_end(); } bool data_contains(address addr) const { return data_begin() <= addr && addr < data_end(); } bool oops_contains(oop* addr) const { return oops_begin() <= addr && addr < oops_end(); } bool contains(address addr) const { return instructions_contains(addr); } bool is_frame_complete_at(address addr) const { return instructions_contains(addr) && addr >= instructions_begin() + _frame_complete_offset; } // Relocation support void fix_oop_relocations(address begin, address end) { fix_oop_relocations(begin, end, false); } void fix_oop_relocations() { fix_oop_relocations(NULL, NULL, false); } relocInfo::relocType reloc_type_for_address(address pc); bool is_at_poll_return(address pc); bool is_at_poll_or_poll_return(address pc); // Support for oops in scopes and relocs: // Note: index 0 is reserved for null. oop oop_at(int index) const { return index == 0? (oop)NULL: *oop_addr_at(index); } oop* oop_addr_at(int index) const{ // for GC // relocation indexes are biased by 1 (because 0 is reserved) assert(index > 0 && index <= _oops_length, "must be a valid non-zero index"); return &oops_begin()[index-1]; } void copy_oops(GrowableArray* oops); // CodeCache support: really only used by the nmethods, but in order to get // asserts and certain bookkeeping to work in the CodeCache they are defined // virtual here. virtual bool is_zombie() const { return false; } virtual bool is_locked_by_vm() const { return false; } virtual bool is_unloaded() const { return false; } virtual bool is_not_entrant() const { return false; } // GC support virtual bool is_alive() const = 0; virtual void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool unloading_occurred); virtual void oops_do(OopClosure* f) = 0; // (All CodeBlob subtypes other than NMethod currently have // an empty oops_do() method. // OopMap for frame OopMapSet* oop_maps() const { return _oop_maps; } void set_oop_maps(OopMapSet* p); OopMap* oop_map_for_return_address(address return_address); virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); } // Frame support int frame_size() const { return _frame_size; } void set_frame_size(int size) { _frame_size = size; } // Returns true, if the next frame is responsible for GC'ing oops passed as arguments virtual bool caller_must_gc_arguments(JavaThread* thread) const { return false; } // Naming const char* name() const { return _name; } void set_name(const char* name) { _name = name; } // Debugging virtual void verify(); virtual void print() const PRODUCT_RETURN; virtual void print_value_on(outputStream* st) const PRODUCT_RETURN; // Print the comment associated with offset on stream, if there is one void print_block_comment(outputStream* stream, intptr_t offset) { _comments.print_block_comment(stream, offset); } // Transfer ownership of comments to this CodeBlob void set_comments(CodeComments& comments) { _comments.assign(comments); } }; //---------------------------------------------------------------------------------------------------- // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc. class BufferBlob: public CodeBlob { friend class VMStructs; private: // Creation support BufferBlob(const char* name, int size); BufferBlob(const char* name, int size, CodeBuffer* cb); void* operator new(size_t s, unsigned size); public: // Creation static BufferBlob* create(const char* name, int buffer_size); static BufferBlob* create(const char* name, CodeBuffer* cb); static void free(BufferBlob* buf); // Typing bool is_buffer_blob() const { return true; } bool is_adapter_blob() const; // GC/Verification support void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } bool is_alive() const { return true; } void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool unloading_occurred) { /* do nothing */ } void oops_do(OopClosure* f) { /* do nothing*/ } void verify(); void print() const PRODUCT_RETURN; void print_value_on(outputStream* st) const PRODUCT_RETURN; }; //---------------------------------------------------------------------------------------------------- // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine class RuntimeStub: public CodeBlob { friend class VMStructs; private: bool _caller_must_gc_arguments; // Creation support RuntimeStub( const char* name, CodeBuffer* cb, int size, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments ); void* operator new(size_t s, unsigned size); public: // Creation static RuntimeStub* new_runtime_stub( const char* stub_name, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments ); // Typing bool is_runtime_stub() const { return true; } // GC support bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; } address entry_point() { return instructions_begin(); } // GC/Verification support void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } bool is_alive() const { return true; } void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool unloading_occurred) { /* do nothing */ } void oops_do(OopClosure* f) { /* do-nothing*/ } void verify(); void print() const PRODUCT_RETURN; void print_value_on(outputStream* st) const PRODUCT_RETURN; }; //---------------------------------------------------------------------------------------------------- // Super-class for all blobs that exist in only one instance. Implements default behaviour. class SingletonBlob: public CodeBlob { friend class VMStructs; public: SingletonBlob( const char* name, CodeBuffer* cb, int header_size, int size, int frame_size, OopMapSet* oop_maps ) : CodeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps) {}; bool is_alive() const { return true; } void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool unloading_occurred) { /* do-nothing*/ } void verify(); // does nothing void print() const PRODUCT_RETURN; void print_value_on(outputStream* st) const PRODUCT_RETURN; }; //---------------------------------------------------------------------------------------------------- // DeoptimizationBlob class DeoptimizationBlob: public SingletonBlob { friend class VMStructs; private: int _unpack_offset; int _unpack_with_exception; int _unpack_with_reexecution; int _unpack_with_exception_in_tls; // Creation support DeoptimizationBlob( CodeBuffer* cb, int size, OopMapSet* oop_maps, int unpack_offset, int unpack_with_exception_offset, int unpack_with_reexecution_offset, int frame_size ); void* operator new(size_t s, unsigned size); public: // Creation static DeoptimizationBlob* create( CodeBuffer* cb, OopMapSet* oop_maps, int unpack_offset, int unpack_with_exception_offset, int unpack_with_reexecution_offset, int frame_size ); // Typing bool is_deoptimization_stub() const { return true; } const DeoptimizationBlob *as_deoptimization_stub() const { return this; } bool exception_address_is_unpack_entry(address pc) const { address unpack_pc = unpack(); return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc); } // GC for args void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ } // Iteration void oops_do(OopClosure* f) {} // Printing void print_value_on(outputStream* st) const PRODUCT_RETURN; address unpack() const { return instructions_begin() + _unpack_offset; } address unpack_with_exception() const { return instructions_begin() + _unpack_with_exception; } address unpack_with_reexecution() const { return instructions_begin() + _unpack_with_reexecution; } // Alternate entry point for C1 where the exception and issuing pc // are in JavaThread::_exception_oop and JavaThread::_exception_pc // instead of being in registers. This is needed because C1 doesn't // model exception paths in a way that keeps these registers free so // there may be live values in those registers during deopt. void set_unpack_with_exception_in_tls_offset(int offset) { _unpack_with_exception_in_tls = offset; assert(contains(instructions_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob"); } address unpack_with_exception_in_tls() const { return instructions_begin() + _unpack_with_exception_in_tls; } }; //---------------------------------------------------------------------------------------------------- // UncommonTrapBlob (currently only used by Compiler 2) #ifdef COMPILER2 class UncommonTrapBlob: public SingletonBlob { friend class VMStructs; private: // Creation support UncommonTrapBlob( CodeBuffer* cb, int size, OopMapSet* oop_maps, int frame_size ); void* operator new(size_t s, unsigned size); public: // Creation static UncommonTrapBlob* create( CodeBuffer* cb, OopMapSet* oop_maps, int frame_size ); // GC for args void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ } // Typing bool is_uncommon_trap_stub() const { return true; } // Iteration void oops_do(OopClosure* f) {} }; //---------------------------------------------------------------------------------------------------- // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2) class ExceptionBlob: public SingletonBlob { friend class VMStructs; private: // Creation support ExceptionBlob( CodeBuffer* cb, int size, OopMapSet* oop_maps, int frame_size ); void* operator new(size_t s, unsigned size); public: // Creation static ExceptionBlob* create( CodeBuffer* cb, OopMapSet* oop_maps, int frame_size ); // GC for args void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } // Typing bool is_exception_stub() const { return true; } // Iteration void oops_do(OopClosure* f) {} }; #endif // COMPILER2 //---------------------------------------------------------------------------------------------------- // SafepointBlob: handles illegal_instruction exceptions during a safepoint class SafepointBlob: public SingletonBlob { friend class VMStructs; private: // Creation support SafepointBlob( CodeBuffer* cb, int size, OopMapSet* oop_maps, int frame_size ); void* operator new(size_t s, unsigned size); public: // Creation static SafepointBlob* create( CodeBuffer* cb, OopMapSet* oop_maps, int frame_size ); // GC for args void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ } // Typing bool is_safepoint_stub() const { return true; } // Iteration void oops_do(OopClosure* f) {} };