477 lines
22 KiB
C++
477 lines
22 KiB
C++
/*
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* Copyright (c) 1997, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_RUNTIME_DEOPTIMIZATION_HPP
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#define SHARE_RUNTIME_DEOPTIMIZATION_HPP
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#include "memory/allocation.hpp"
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#include "runtime/frame.hpp"
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class ProfileData;
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class vframeArray;
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class MonitorInfo;
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class MonitorValue;
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class ObjectValue;
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class AutoBoxObjectValue;
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class ScopeValue;
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class compiledVFrame;
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template<class E> class GrowableArray;
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class Deoptimization : AllStatic {
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friend class VMStructs;
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public:
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// What condition caused the deoptimization?
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enum DeoptReason {
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Reason_many = -1, // indicates presence of several reasons
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Reason_none = 0, // indicates absence of a relevant deopt.
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// Next 8 reasons are recorded per bytecode in DataLayout::trap_bits.
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// This is more complicated for JVMCI as JVMCI may deoptimize to *some* bytecode before the
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// bytecode that actually caused the deopt (with inlining, JVMCI may even deoptimize to a
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// bytecode in another method):
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// - bytecode y in method b() causes deopt
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// - JVMCI deoptimizes to bytecode x in method a()
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// -> the deopt reason will be recorded for method a() at bytecode x
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Reason_null_check, // saw unexpected null or zero divisor (@bci)
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Reason_null_assert, // saw unexpected non-null or non-zero (@bci)
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Reason_range_check, // saw unexpected array index (@bci)
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Reason_class_check, // saw unexpected object class (@bci)
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Reason_array_check, // saw unexpected array class (aastore @bci)
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Reason_intrinsic, // saw unexpected operand to intrinsic (@bci)
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Reason_bimorphic, // saw unexpected object class in bimorphic inlining (@bci)
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#if INCLUDE_JVMCI
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Reason_unreached0 = Reason_null_assert,
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Reason_type_checked_inlining = Reason_intrinsic,
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Reason_optimized_type_check = Reason_bimorphic,
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#endif
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Reason_profile_predicate, // compiler generated predicate moved from frequent branch in a loop failed
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// recorded per method
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Reason_unloaded, // unloaded class or constant pool entry
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Reason_uninitialized, // bad class state (uninitialized)
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Reason_initialized, // class has been fully initialized
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Reason_unreached, // code is not reached, compiler
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Reason_unhandled, // arbitrary compiler limitation
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Reason_constraint, // arbitrary runtime constraint violated
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Reason_div0_check, // a null_check due to division by zero
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Reason_age, // nmethod too old; tier threshold reached
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Reason_predicate, // compiler generated predicate failed
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Reason_loop_limit_check, // compiler generated loop limits check failed
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Reason_speculate_class_check, // saw unexpected object class from type speculation
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Reason_speculate_null_check, // saw unexpected null from type speculation
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Reason_speculate_null_assert, // saw unexpected null from type speculation
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Reason_rtm_state_change, // rtm state change detected
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Reason_unstable_if, // a branch predicted always false was taken
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Reason_unstable_fused_if, // fused two ifs that had each one untaken branch. One is now taken.
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#if INCLUDE_JVMCI
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Reason_aliasing, // optimistic assumption about aliasing failed
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Reason_transfer_to_interpreter, // explicit transferToInterpreter()
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Reason_not_compiled_exception_handler,
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Reason_unresolved,
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Reason_jsr_mismatch,
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#endif
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// Reason_tenured is counted separately, add normal counted Reasons above.
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// Related to MethodData::_trap_hist_limit where Reason_tenured isn't included
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Reason_tenured, // age of the code has reached the limit
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Reason_LIMIT,
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// Note: Keep this enum in sync. with _trap_reason_name.
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Reason_RECORDED_LIMIT = Reason_profile_predicate // some are not recorded per bc
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// Note: Reason_RECORDED_LIMIT should fit into 31 bits of
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// DataLayout::trap_bits. This dependency is enforced indirectly
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// via asserts, to avoid excessive direct header-to-header dependencies.
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// See Deoptimization::trap_state_reason and class DataLayout.
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};
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// What action must be taken by the runtime?
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enum DeoptAction {
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Action_none, // just interpret, do not invalidate nmethod
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Action_maybe_recompile, // recompile the nmethod; need not invalidate
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Action_reinterpret, // invalidate the nmethod, reset IC, maybe recompile
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Action_make_not_entrant, // invalidate the nmethod, recompile (probably)
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Action_make_not_compilable, // invalidate the nmethod and do not compile
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Action_LIMIT
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// Note: Keep this enum in sync. with _trap_action_name.
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};
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enum {
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_action_bits = 3,
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_reason_bits = 5,
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_debug_id_bits = 23,
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_action_shift = 0,
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_reason_shift = _action_shift+_action_bits,
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_debug_id_shift = _reason_shift+_reason_bits,
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BC_CASE_LIMIT = PRODUCT_ONLY(1) NOT_PRODUCT(4) // for _deoptimization_hist
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};
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enum UnpackType {
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Unpack_deopt = 0, // normal deoptimization, use pc computed in unpack_vframe_on_stack
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Unpack_exception = 1, // exception is pending
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Unpack_uncommon_trap = 2, // redo last byte code (C2 only)
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Unpack_reexecute = 3, // reexecute bytecode (C1 only)
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Unpack_LIMIT = 4
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};
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#if INCLUDE_JVMCI
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// Can reconstruct virtualized unsafe large accesses to byte arrays.
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static const int _support_large_access_byte_array_virtualization = 1;
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#endif
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// Make all nmethods that are marked_for_deoptimization not_entrant and deoptimize any live
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// activations using those nmethods. If an nmethod is passed as an argument then it is
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// marked_for_deoptimization and made not_entrant. Otherwise a scan of the code cache is done to
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// find all marked nmethods and they are made not_entrant.
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static void deoptimize_all_marked(nmethod* nmethod_only = NULL);
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private:
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// Revoke biased locks at deopt.
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static void revoke_from_deopt_handler(JavaThread* thread, frame fr, RegisterMap* map);
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public:
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// Deoptimizes a frame lazily. Deopt happens on return to the frame.
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static void deoptimize(JavaThread* thread, frame fr, DeoptReason reason = Reason_constraint);
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#if INCLUDE_JVMCI
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static address deoptimize_for_missing_exception_handler(CompiledMethod* cm);
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static oop get_cached_box(AutoBoxObjectValue* bv, frame* fr, RegisterMap* reg_map, TRAPS);
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#endif
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private:
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// Does the actual work for deoptimizing a single frame
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static void deoptimize_single_frame(JavaThread* thread, frame fr, DeoptReason reason);
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#if COMPILER2_OR_JVMCI
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public:
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// Support for restoring non-escaping objects
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static bool realloc_objects(JavaThread* thread, frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects, TRAPS);
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static void reassign_type_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, typeArrayOop obj, BasicType type);
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static void reassign_object_array_elements(frame* fr, RegisterMap* reg_map, ObjectValue* sv, objArrayOop obj);
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static void reassign_fields(frame* fr, RegisterMap* reg_map, GrowableArray<ScopeValue*>* objects, bool realloc_failures, bool skip_internal);
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static void relock_objects(GrowableArray<MonitorInfo*>* monitors, JavaThread* thread, bool realloc_failures);
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static void pop_frames_failed_reallocs(JavaThread* thread, vframeArray* array);
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NOT_PRODUCT(static void print_objects(GrowableArray<ScopeValue*>* objects, bool realloc_failures);)
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#endif // COMPILER2_OR_JVMCI
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public:
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static vframeArray* create_vframeArray(JavaThread* thread, frame fr, RegisterMap *reg_map, GrowableArray<compiledVFrame*>* chunk, bool realloc_failures);
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// Interface used for unpacking deoptimized frames
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// UnrollBlock is returned by fetch_unroll_info() to the deoptimization handler (blob).
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// This is only a CheapObj to ease debugging after a deopt failure
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class UnrollBlock : public CHeapObj<mtCompiler> {
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friend class VMStructs;
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friend class JVMCIVMStructs;
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private:
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int _size_of_deoptimized_frame; // Size, in bytes, of current deoptimized frame
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int _caller_adjustment; // Adjustment, in bytes, to caller's SP by initial interpreted frame
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int _number_of_frames; // Number frames to unroll
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int _total_frame_sizes; // Total of number*sizes frames
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intptr_t* _frame_sizes; // Array of frame sizes, in bytes, for unrolling the stack
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address* _frame_pcs; // Array of frame pc's, in bytes, for unrolling the stack
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intptr_t* _register_block; // Block for storing callee-saved registers.
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BasicType _return_type; // Tells if we have to restore double or long return value
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intptr_t _initial_info; // Platform dependent data for the sender frame (was FP on x86)
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int _caller_actual_parameters; // The number of actual arguments at the
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// interpreted caller of the deoptimized frame
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int _unpack_kind; // exec_mode that can be changed during fetch_unroll_info
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// The following fields are used as temps during the unpacking phase
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// (which is tight on registers, especially on x86). They really ought
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// to be PD variables but that involves moving this class into its own
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// file to use the pd include mechanism. Maybe in a later cleanup ...
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intptr_t _counter_temp; // SHOULD BE PD VARIABLE (x86 frame count temp)
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intptr_t _sender_sp_temp; // SHOULD BE PD VARIABLE (x86 sender_sp)
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public:
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// Constructor
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UnrollBlock(int size_of_deoptimized_frame,
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int caller_adjustment,
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int caller_actual_parameters,
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int number_of_frames,
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intptr_t* frame_sizes,
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address* frames_pcs,
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BasicType return_type,
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int unpack_kind);
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~UnrollBlock();
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// Returns where a register is located.
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intptr_t* value_addr_at(int register_number) const;
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// Accessors
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intptr_t* frame_sizes() const { return _frame_sizes; }
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int number_of_frames() const { return _number_of_frames; }
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address* frame_pcs() const { return _frame_pcs ; }
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int unpack_kind() const { return _unpack_kind; }
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// Returns the total size of frames
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int size_of_frames() const;
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void set_initial_info(intptr_t info) { _initial_info = info; }
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int caller_actual_parameters() const { return _caller_actual_parameters; }
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// Accessors used by the code generator for the unpack stub.
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static int size_of_deoptimized_frame_offset_in_bytes() { return offset_of(UnrollBlock, _size_of_deoptimized_frame); }
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static int caller_adjustment_offset_in_bytes() { return offset_of(UnrollBlock, _caller_adjustment); }
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static int number_of_frames_offset_in_bytes() { return offset_of(UnrollBlock, _number_of_frames); }
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static int frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _frame_sizes); }
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static int total_frame_sizes_offset_in_bytes() { return offset_of(UnrollBlock, _total_frame_sizes); }
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static int frame_pcs_offset_in_bytes() { return offset_of(UnrollBlock, _frame_pcs); }
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static int register_block_offset_in_bytes() { return offset_of(UnrollBlock, _register_block); }
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static int return_type_offset_in_bytes() { return offset_of(UnrollBlock, _return_type); }
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static int counter_temp_offset_in_bytes() { return offset_of(UnrollBlock, _counter_temp); }
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static int initial_info_offset_in_bytes() { return offset_of(UnrollBlock, _initial_info); }
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static int unpack_kind_offset_in_bytes() { return offset_of(UnrollBlock, _unpack_kind); }
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static int sender_sp_temp_offset_in_bytes() { return offset_of(UnrollBlock, _sender_sp_temp); }
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BasicType return_type() const { return _return_type; }
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void print();
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};
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//** Returns an UnrollBlock continuing information
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// how to make room for the resulting interpreter frames.
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// Called by assembly stub after execution has returned to
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// deoptimized frame.
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// @argument thread. Thread where stub_frame resides.
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// @see OptoRuntime::deoptimization_fetch_unroll_info_C
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static UnrollBlock* fetch_unroll_info(JavaThread* thread, int exec_mode);
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//** Unpacks vframeArray onto execution stack
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// Called by assembly stub after execution has returned to
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// deoptimized frame and after the stack unrolling.
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// @argument thread. Thread where stub_frame resides.
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// @argument exec_mode. Determines how execution should be continued in top frame.
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// 0 means continue after current byte code
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// 1 means exception has happened, handle exception
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// 2 means reexecute current bytecode (for uncommon traps).
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// @see OptoRuntime::deoptimization_unpack_frames_C
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// Return BasicType of call return type, if any
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static BasicType unpack_frames(JavaThread* thread, int exec_mode);
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// Cleans up deoptimization bits on thread after unpacking or in the
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// case of an exception.
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static void cleanup_deopt_info(JavaThread *thread,
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vframeArray * array);
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// Restores callee saved values from deoptimized frame into oldest interpreter frame
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// so caller of the deoptimized frame will get back the values it expects.
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static void unwind_callee_save_values(frame* f, vframeArray* vframe_array);
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//** Performs an uncommon trap for compiled code.
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// The top most compiler frame is converted into interpreter frames
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static UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index, jint exec_mode);
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// Helper routine that enters the VM and may block
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static void uncommon_trap_inner(JavaThread* thread, jint unloaded_class_index);
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//** Deoptimizes the frame identified by id.
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// Only called from VMDeoptimizeFrame
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// @argument thread. Thread where stub_frame resides.
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// @argument id. id of frame that should be deoptimized.
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static void deoptimize_frame_internal(JavaThread* thread, intptr_t* id, DeoptReason reason);
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// if thread is not the current thread then execute
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// VM_DeoptimizeFrame otherwise deoptimize directly.
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static void deoptimize_frame(JavaThread* thread, intptr_t* id, DeoptReason reason);
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static void deoptimize_frame(JavaThread* thread, intptr_t* id);
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// Statistics
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static void gather_statistics(DeoptReason reason, DeoptAction action,
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Bytecodes::Code bc = Bytecodes::_illegal);
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static void print_statistics();
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// How much room to adjust the last frame's SP by, to make space for
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// the callee's interpreter frame (which expects locals to be next to
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// incoming arguments)
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static int last_frame_adjust(int callee_parameters, int callee_locals);
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// trap_request codes
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static DeoptReason trap_request_reason(int trap_request) {
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if (trap_request < 0)
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return (DeoptReason)
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((~(trap_request) >> _reason_shift) & right_n_bits(_reason_bits));
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else
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// standard reason for unloaded CP entry
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return Reason_unloaded;
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}
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static DeoptAction trap_request_action(int trap_request) {
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if (trap_request < 0)
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return (DeoptAction)
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((~(trap_request) >> _action_shift) & right_n_bits(_action_bits));
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else
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// standard action for unloaded CP entry
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return _unloaded_action;
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}
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static int trap_request_debug_id(int trap_request) {
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if (trap_request < 0) {
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return ((~(trap_request) >> _debug_id_shift) & right_n_bits(_debug_id_bits));
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} else {
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// standard action for unloaded CP entry
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return 0;
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}
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}
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static int trap_request_index(int trap_request) {
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if (trap_request < 0)
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return -1;
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else
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return trap_request;
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}
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static int make_trap_request(DeoptReason reason, DeoptAction action,
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int index = -1) {
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assert((1 << _reason_bits) >= Reason_LIMIT, "enough bits");
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assert((1 << _action_bits) >= Action_LIMIT, "enough bits");
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int trap_request;
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if (index != -1)
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trap_request = index;
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else
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trap_request = (~(((reason) << _reason_shift)
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+ ((action) << _action_shift)));
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assert(reason == trap_request_reason(trap_request), "valid reason");
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assert(action == trap_request_action(trap_request), "valid action");
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assert(index == trap_request_index(trap_request), "valid index");
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return trap_request;
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}
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// The trap_state stored in a MDO is decoded here.
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// It records two items of information.
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// reason: If a deoptimization happened here, what its reason was,
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// or if there were multiple deopts with differing reasons.
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// recompiled: If a deoptimization here triggered a recompilation.
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// Note that not all reasons are recorded per-bci.
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static DeoptReason trap_state_reason(int trap_state);
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static int trap_state_has_reason(int trap_state, int reason);
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static int trap_state_add_reason(int trap_state, int reason);
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static bool trap_state_is_recompiled(int trap_state);
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static int trap_state_set_recompiled(int trap_state, bool z);
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static const char* format_trap_state(char* buf, size_t buflen,
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int trap_state);
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static bool reason_is_recorded_per_bytecode(DeoptReason reason) {
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return reason > Reason_none && reason <= Reason_RECORDED_LIMIT;
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}
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static DeoptReason reason_recorded_per_bytecode_if_any(DeoptReason reason) {
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if (reason_is_recorded_per_bytecode(reason))
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return reason;
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else if (reason == Reason_div0_check) // null check due to divide-by-zero?
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return Reason_null_check; // recorded per BCI as a null check
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else if (reason == Reason_speculate_class_check)
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return Reason_class_check;
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else if (reason == Reason_speculate_null_check)
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return Reason_null_check;
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else if (reason == Reason_speculate_null_assert)
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return Reason_null_assert;
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else if (reason == Reason_unstable_if)
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return Reason_intrinsic;
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else if (reason == Reason_unstable_fused_if)
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return Reason_range_check;
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else
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return Reason_none;
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}
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static bool reason_is_speculate(int reason) {
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if (reason == Reason_speculate_class_check ||
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reason == Reason_speculate_null_check ||
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reason == Reason_speculate_null_assert) {
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return true;
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}
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return false;
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}
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static DeoptReason reason_null_check(bool speculative) {
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return speculative ? Deoptimization::Reason_speculate_null_check : Deoptimization::Reason_null_check;
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}
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static DeoptReason reason_class_check(bool speculative) {
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return speculative ? Deoptimization::Reason_speculate_class_check : Deoptimization::Reason_class_check;
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}
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static DeoptReason reason_null_assert(bool speculative) {
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return speculative ? Deoptimization::Reason_speculate_null_assert : Deoptimization::Reason_null_assert;
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}
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static uint per_method_trap_limit(int reason) {
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return reason_is_speculate(reason) ? (uint)PerMethodSpecTrapLimit : (uint)PerMethodTrapLimit;
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}
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static const char* trap_reason_name(int reason);
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static const char* trap_action_name(int action);
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// Format like reason='foo' action='bar' index='123'.
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// This is suitable both for XML and for tty output.
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static const char* format_trap_request(char* buf, size_t buflen,
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int trap_request);
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static jint total_deoptimization_count();
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// JVMTI PopFrame support
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// Preserves incoming arguments to the popped frame when it is
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// returning to a deoptimized caller
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static void popframe_preserve_args(JavaThread* thread, int bytes_to_save, void* start_address);
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static MethodData* get_method_data(JavaThread* thread, const methodHandle& m, bool create_if_missing);
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private:
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// Update the mdo's count and per-BCI reason bits, returning previous state:
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static ProfileData* query_update_method_data(MethodData* trap_mdo,
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int trap_bci,
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DeoptReason reason,
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bool update_total_trap_count,
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#if INCLUDE_JVMCI
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bool is_osr,
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#endif
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Method* compiled_method,
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//outputs:
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uint& ret_this_trap_count,
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bool& ret_maybe_prior_trap,
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bool& ret_maybe_prior_recompile);
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// class loading support for uncommon trap
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static void load_class_by_index(const constantPoolHandle& constant_pool, int index, TRAPS);
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static UnrollBlock* fetch_unroll_info_helper(JavaThread* thread, int exec_mode);
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static DeoptAction _unloaded_action; // == Action_reinterpret;
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static const char* _trap_reason_name[];
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static const char* _trap_action_name[];
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|
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static juint _deoptimization_hist[Reason_LIMIT][1+Action_LIMIT][BC_CASE_LIMIT];
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// Note: Histogram array size is 1-2 Kb.
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|
|
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public:
|
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static void update_method_data_from_interpreter(MethodData* trap_mdo, int trap_bci, int reason);
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};
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|
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class DeoptimizationMarker : StackObj { // for profiling
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static bool _is_active;
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public:
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DeoptimizationMarker() { _is_active = true; }
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~DeoptimizationMarker() { _is_active = false; }
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static bool is_active() { return _is_active; }
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};
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#endif // SHARE_RUNTIME_DEOPTIMIZATION_HPP
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