Mercurial > hg > graal-jvmci-8
diff src/share/vm/runtime/deoptimization.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/deoptimization.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,348 @@ +/* + * 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. + * + */ + +class ProfileData; +class vframeArray; +class MonitorValue; +class ObjectValue; + +class Deoptimization : AllStatic { + public: + // What condition caused the deoptimization? + enum DeoptReason { + Reason_many = -1, // indicates presence of several reasons + Reason_none = 0, // indicates absence of a relevant deopt. + Reason_null_check, // saw unexpected null or zero divisor (@bci) + Reason_null_assert, // saw unexpected non-null or non-zero (@bci) + Reason_range_check, // saw unexpected array index (@bci) + Reason_class_check, // saw unexpected object class (@bci) + Reason_array_check, // saw unexpected array class (aastore @bci) + Reason_intrinsic, // saw unexpected operand to intrinsic (@bci) + Reason_unloaded, // unloaded class or constant pool entry + Reason_uninitialized, // bad class state (uninitialized) + Reason_unreached, // code is not reached, compiler + Reason_unhandled, // arbitrary compiler limitation + Reason_constraint, // arbitrary runtime constraint violated + Reason_div0_check, // a null_check due to division by zero + Reason_age, // nmethod too old; tier threshold reached + Reason_LIMIT, + // Note: Keep this enum in sync. with _trap_reason_name. + Reason_RECORDED_LIMIT = Reason_unloaded // some are not recorded per bc + // Note: Reason_RECORDED_LIMIT should be < 8 to fit into 3 bits of + // DataLayout::trap_bits. This dependency is enforced indirectly + // via asserts, to avoid excessive direct header-to-header dependencies. + // See Deoptimization::trap_state_reason and class DataLayout. + }; + + // What action must be taken by the runtime? + enum DeoptAction { + Action_none, // just interpret, do not invalidate nmethod + Action_maybe_recompile, // recompile the nmethod; need not invalidate + Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile + Action_make_not_entrant, // invalidate the nmethod, recompile (probably) + Action_make_not_compilable, // invalidate the nmethod and do not compile + Action_LIMIT + // Note: Keep this enum in sync. with _trap_action_name. + }; + + enum { + _action_bits = 3, + _reason_bits = 4, + _action_shift = 0, + _reason_shift = _action_shift+_action_bits, + BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist + }; + + enum UnpackType { + Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack + Unpack_exception = 1, // exception is pending + Unpack_uncommon_trap = 2, // redo last byte code (C2 only) + Unpack_reexecute = 3 // reexecute bytecode (C1 only) + }; + + // Checks all compiled methods. Invalid methods are deleted and + // corresponding activations are deoptimized. + static int deoptimize_dependents(); + + // Deoptimizes a frame lazily. nmethod gets patched deopt happens on return to the frame + static void deoptimize(JavaThread* thread, frame fr, RegisterMap *reg_map); + + private: + // Does the actual work for deoptimizing a single frame + static void deoptimize_single_frame(JavaThread* thread, frame fr); + + // Helper function to revoke biases of all monitors in frame if UseBiasedLocking + // is enabled + static void revoke_biases_of_monitors(JavaThread* thread, frame fr, RegisterMap* map); + // Helper function to revoke biases of all monitors in frames + // executing in a particular CodeBlob if UseBiasedLocking is enabled + static void revoke_biases_of_monitors(CodeBlob* cb); + +#ifdef COMPILER2 + // Support for restoring non-escaping objects + static bool realloc_objects(JavaThread* thread, frame* fr, GrowableArray<ScopeValue*>* objects, TRAPS); + static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type); + static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj); + static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects); + static void relock_objects(frame* fr, RegisterMap* reg_map, GrowableArray<MonitorValue*>* monitors); + NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects);) +#endif // COMPILER2 + + public: + static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk); + + // Interface used for unpacking deoptimized frames + + // UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob). + // This is only a CheapObj to ease debugging after a deopt failure + class UnrollBlock : public CHeapObj { + private: + int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame + int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame + int _number_of_frames; // Number frames to unroll + int _total_frame_sizes; // Total of number*sizes frames + intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack + address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack + intptr_t* _register_block; // Block for storing callee-saved registers. + BasicType _return_type; // Tells if we have to restore double or long return value + // The following fields are used as temps during the unpacking phase + // (which is tight on registers, especially on x86). They really ought + // to be PD variables but that involves moving this class into its own + // file to use the pd include mechanism. Maybe in a later cleanup ... + intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp) + intptr_t _initial_fp; // SHOULD BE PD VARIABLE (x86/c2 initial ebp) + intptr_t _unpack_kind; // SHOULD BE PD VARIABLE (x86 unpack kind) + intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp) + public: + // Constructor + UnrollBlock(int size_of_deoptimized_frame, + int caller_adjustment, + int number_of_frames, + intptr_t* frame_sizes, + address* frames_pcs, + BasicType return_type); + ~UnrollBlock(); + + // Returns where a register is located. + intptr_t* value_addr_at(int register_number) const; + + // Accessors + intptr_t* frame_sizes() const { return _frame_sizes; } + int number_of_frames() const { return _number_of_frames; } + address* frame_pcs() const { return _frame_pcs ; } + + // Returns the total size of frames + int size_of_frames() const; + + // Accessors used by the code generator for the unpack stub. + static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); } + static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); } + static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); } + static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); } + static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); } + static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); } + static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); } + static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); } + static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); } + static int initial_fp_offset_in_bytes() { return offset_of(UnrollBlock, _initial_fp); } + static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); } + static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); } + + BasicType return_type() const { return _return_type; } + void print(); + }; + + //** Returns an UnrollBlock continuing information + // how to make room for the resulting interpreter frames. + // Called by assembly stub after execution has returned to + // deoptimized frame. + // @argument thread. Thread where stub_frame resides. + // @see OptoRuntime::deoptimization_fetch_unroll_info_C + static UnrollBlock* fetch_unroll_info(JavaThread* thread); + + //** Unpacks vframeArray onto execution stack + // Called by assembly stub after execution has returned to + // deoptimized frame and after the stack unrolling. + // @argument thread. Thread where stub_frame resides. + // @argument exec_mode. Determines how execution should be continuted in top frame. + // 0 means continue after current byte code + // 1 means exception has happened, handle exception + // 2 means reexecute current bytecode (for uncommon traps). + // @see OptoRuntime::deoptimization_unpack_frames_C + // Return BasicType of call return type, if any + static BasicType unpack_frames(JavaThread* thread, int exec_mode); + + // Cleans up deoptimization bits on thread after unpacking or in the + // case of an exception. + static void cleanup_deopt_info(JavaThread *thread, + vframeArray * array); + + // Restores callee saved values from deoptimized frame into oldest interpreter frame + // so caller of the deoptimized frame will get back the values it expects. + static void unwind_callee_save_values(frame* f, vframeArray* vframe_array); + + //** Performs an uncommon trap for compiled code. + // The top most compiler frame is converted into interpreter frames + static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); + // Helper routine that enters the VM and may block + static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index); + + //** Deoptimizes the frame identified by id. + // Only called from VMDeoptimizeFrame + // @argument thread. Thread where stub_frame resides. + // @argument id. id of frame that should be deoptimized. + static void deoptimize_frame(JavaThread* thread, intptr_t* id); + + // Statistics + static void gather_statistics(DeoptReason reason, DeoptAction action, + Bytecodes::Code bc = Bytecodes::_illegal); + static void print_statistics(); + + // How much room to adjust the last frame's SP by, to make space for + // the callee's interpreter frame (which expects locals to be next to + // incoming arguments) + static int last_frame_adjust(int callee_parameters, int callee_locals); + + // trap_request codes + static DeoptReason trap_request_reason(int trap_request) { + if (trap_request < 0) + return (DeoptReason) + ((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits)); + else + // standard reason for unloaded CP entry + return Reason_unloaded; + } + static DeoptAction trap_request_action(int trap_request) { + if (trap_request < 0) + return (DeoptAction) + ((~(trap_request) >> _action_shift) & right_n_bits(_action_bits)); + else + // standard action for unloaded CP entry + return _unloaded_action; + } + static int trap_request_index(int trap_request) { + if (trap_request < 0) + return -1; + else + return trap_request; + } + static int make_trap_request(DeoptReason reason, DeoptAction action, + int index = -1) { + assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits"); + assert((1 << _action_bits) >= Action_LIMIT, "enough bits"); + int trap_request; + if (index != -1) + trap_request = index; + else + trap_request = (~(((reason) << _reason_shift) + + ((action) << _action_shift))); + assert(reason == trap_request_reason(trap_request), "valid reason"); + assert(action == trap_request_action(trap_request), "valid action"); + assert(index == trap_request_index(trap_request), "valid index"); + return trap_request; + } + + // The trap_state stored in a MDO is decoded here. + // It records two items of information. + // reason: If a deoptimization happened here, what its reason was, + // or if there were multiple deopts with differing reasons. + // recompiled: If a deoptimization here triggered a recompilation. + // Note that not all reasons are recorded per-bci. + static DeoptReason trap_state_reason(int trap_state); + static int trap_state_has_reason(int trap_state, int reason); + static int trap_state_add_reason(int trap_state, int reason); + static bool trap_state_is_recompiled(int trap_state); + static int trap_state_set_recompiled(int trap_state, bool z); + static const char* format_trap_state(char* buf, size_t buflen, + int trap_state); + + static bool reason_is_recorded_per_bytecode(DeoptReason reason) { + return reason > Reason_none && reason < Reason_RECORDED_LIMIT; + } + + static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) { + if (reason_is_recorded_per_bytecode(reason)) + return reason; + else if (reason == Reason_div0_check) // null check due to divide-by-zero? + return Reason_null_check; // recorded per BCI as a null check + else + return Reason_none; + } + + static const char* trap_reason_name(int reason); + static const char* trap_action_name(int action); + // Format like reason='foo' action='bar' index='123'. + // This is suitable both for XML and for tty output. + static const char* format_trap_request(char* buf, size_t buflen, + int trap_request); + + static jint total_deoptimization_count(); + static jint deoptimization_count(DeoptReason reason); + + // JVMTI PopFrame support + + // Preserves incoming arguments to the popped frame when it is + // returning to a deoptimized caller + static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address); + + private: + enum { + _no_count = -1 + }; + + static void reset_invocation_counter(ScopeDesc* trap_scope, jint count = _no_count); + + static methodDataOop get_method_data(JavaThread* thread, methodHandle m, bool create_if_missing); + // Update the mdo's count and per-BCI reason bits, returning previous state: + static ProfileData* query_update_method_data(methodDataHandle trap_mdo, + int trap_bci, + DeoptReason reason, + //outputs: + uint& ret_this_trap_count, + bool& ret_maybe_prior_trap, + bool& ret_maybe_prior_recompile); + // class loading support for uncommon trap + static void load_class_by_index(constantPoolHandle constant_pool, int index, TRAPS); + static void load_class_by_index(constantPoolHandle constant_pool, int index); + + static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread); + + static DeoptAction _unloaded_action; // == Action_reinterpret; + static const char* _trap_reason_name[Reason_LIMIT]; + static const char* _trap_action_name[Action_LIMIT]; + + static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT]; + // Note: Histogram array size is 1-2 Kb. + + public: + static void update_method_data_from_interpreter(methodDataHandle trap_mdo, int trap_bci, int reason); +}; + +class DeoptimizationMarker : StackObj { // for profiling + static bool _is_active; +public: + DeoptimizationMarker() { _is_active = true; } + ~DeoptimizationMarker() { _is_active = false; } + static bool is_active() { return _is_active; } +};