author | rkennke |
Wed, 07 Nov 2018 20:21:35 +0100 | |
changeset 52441 | 6082c529aed8 |
parent 52429 | b64514ff68fd |
child 52471 | 04d7e790aa2e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, 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_GC_SHARED_C2_BARRIERSETC2_HPP |
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#define SHARE_GC_SHARED_C2_BARRIERSETC2_HPP |
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#include "memory/allocation.hpp" |
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#include "oops/accessDecorators.hpp" |
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#include "opto/loopnode.hpp" |
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#include "opto/memnode.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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// This means the access is mismatched. This means the value of an access |
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// is not equivalent to the value pointed to by the address. |
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const DecoratorSet C2_MISMATCHED = DECORATOR_LAST << 1; |
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// The access may not be aligned to its natural size. |
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const DecoratorSet C2_UNALIGNED = DECORATOR_LAST << 2; |
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// The atomic cmpxchg is weak, meaning that spurious false negatives are allowed, |
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// but never false positives. |
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const DecoratorSet C2_WEAK_CMPXCHG = DECORATOR_LAST << 3; |
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// This denotes that a load has control dependency. |
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const DecoratorSet C2_CONTROL_DEPENDENT_LOAD = DECORATOR_LAST << 4; |
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// This denotes that a load that must be pinned. |
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const DecoratorSet C2_PINNED_LOAD = DECORATOR_LAST << 5; |
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// This denotes that the access is produced from the sun.misc.Unsafe intrinsics. |
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const DecoratorSet C2_UNSAFE_ACCESS = DECORATOR_LAST << 6; |
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// This denotes that the access mutates state. |
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const DecoratorSet C2_WRITE_ACCESS = DECORATOR_LAST << 7; |
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// This denotes that the access reads state. |
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const DecoratorSet C2_READ_ACCESS = DECORATOR_LAST << 8; |
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// A nearby allocation? |
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const DecoratorSet C2_TIGHLY_COUPLED_ALLOC = DECORATOR_LAST << 9; |
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// Loads and stores from an arraycopy being optimized |
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const DecoratorSet C2_ARRAY_COPY = DECORATOR_LAST << 10; |
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class Compile; |
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class GraphKit; |
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class IdealKit; |
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class Node; |
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class Type; |
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class TypePtr; |
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class PhaseMacroExpand; |
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// This class wraps a node and a type. |
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class C2AccessValue: public StackObj { |
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protected: |
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Node* _node; |
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const Type* _type; |
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public: |
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C2AccessValue(Node* node, const Type* type) : |
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_node(node), |
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_type(type) {} |
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Node* node() const { return _node; } |
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const Type* type() const { return _type; } |
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void set_node(Node* node) { _node = node; } |
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}; |
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// This class wraps a node and a pointer type. |
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class C2AccessValuePtr: public C2AccessValue { |
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public: |
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C2AccessValuePtr(Node* node, const TypePtr* type) : |
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C2AccessValue(node, reinterpret_cast<const Type*>(type)) {} |
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const TypePtr* type() const { return reinterpret_cast<const TypePtr*>(_type); } |
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}; |
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// This class wraps a bunch of context parameters thare are passed around in the |
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// BarrierSetC2 backend hierarchy, for loads and stores, to reduce boiler plate. |
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class C2Access: public StackObj { |
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protected: |
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DecoratorSet _decorators; |
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BasicType _type; |
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Node* _base; |
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C2AccessValuePtr& _addr; |
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Node* _raw_access; |
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void fixup_decorators(); |
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public: |
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C2Access(DecoratorSet decorators, |
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BasicType type, Node* base, C2AccessValuePtr& addr) : |
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_decorators(decorators), |
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_type(type), |
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_base(base), |
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_addr(addr), |
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_raw_access(NULL) |
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{} |
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DecoratorSet decorators() const { return _decorators; } |
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Node* base() const { return _base; } |
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C2AccessValuePtr& addr() const { return _addr; } |
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BasicType type() const { return _type; } |
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bool is_oop() const { return _type == T_OBJECT || _type == T_ARRAY; } |
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bool is_raw() const { return (_decorators & AS_RAW) != 0; } |
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Node* raw_access() const { return _raw_access; } |
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void set_raw_access(Node* raw_access) { _raw_access = raw_access; } |
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virtual void set_memory() {} // no-op for normal accesses, but not for atomic accesses. |
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MemNode::MemOrd mem_node_mo() const; |
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bool needs_cpu_membar() const; |
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virtual PhaseGVN& gvn() const = 0; |
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virtual bool is_parse_access() const { return false; } |
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virtual bool is_opt_access() const { return false; } |
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}; |
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// C2Access for parse time calls to the BarrierSetC2 backend. |
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class C2ParseAccess: public C2Access { |
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protected: |
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GraphKit* _kit; |
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void* barrier_set_state() const; |
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public: |
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C2ParseAccess(GraphKit* kit, DecoratorSet decorators, |
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BasicType type, Node* base, C2AccessValuePtr& addr) : |
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C2Access(decorators, type, base, addr), |
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_kit(kit) { |
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fixup_decorators(); |
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} |
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GraphKit* kit() const { return _kit; } |
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template <typename T> |
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T barrier_set_state_as() const { |
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return reinterpret_cast<T>(barrier_set_state()); |
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} |
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virtual PhaseGVN& gvn() const; |
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virtual bool is_parse_access() const { return true; } |
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}; |
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// This class wraps a bunch of context parameters thare are passed around in the |
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// BarrierSetC2 backend hierarchy, for atomic accesses, to reduce boiler plate. |
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class C2AtomicParseAccess: public C2ParseAccess { |
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Node* _memory; |
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uint _alias_idx; |
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bool _needs_pinning; |
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public: |
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C2AtomicParseAccess(GraphKit* kit, DecoratorSet decorators, BasicType type, |
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Node* base, C2AccessValuePtr& addr, uint alias_idx) : |
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C2ParseAccess(kit, decorators, type, base, addr), |
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_memory(NULL), |
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_alias_idx(alias_idx), |
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_needs_pinning(true) {} |
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// Set the memory node based on the current memory slice. |
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virtual void set_memory(); |
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Node* memory() const { return _memory; } |
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uint alias_idx() const { return _alias_idx; } |
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bool needs_pinning() const { return _needs_pinning; } |
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void set_needs_pinning(bool value) { _needs_pinning = value; } |
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}; |
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// C2Access for optimization time calls to the BarrierSetC2 backend. |
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class C2OptAccess: public C2Access { |
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PhaseGVN& _gvn; |
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MergeMemNode* _mem; |
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Node* _ctl; |
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public: |
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C2OptAccess(PhaseGVN& gvn, Node* ctl, MergeMemNode* mem, DecoratorSet decorators, |
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BasicType type, Node* base, C2AccessValuePtr& addr) : |
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C2Access(decorators, type, base, addr), |
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_gvn(gvn), _mem(mem), _ctl(ctl) { |
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fixup_decorators(); |
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} |
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MergeMemNode* mem() const { return _mem; } |
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Node* ctl() const { return _ctl; } |
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// void set_mem(Node* mem) { _mem = mem; } |
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void set_ctl(Node* ctl) { _ctl = ctl; } |
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virtual PhaseGVN& gvn() const { return _gvn; } |
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virtual bool is_opt_access() const { return true; } |
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}; |
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// This is the top-level class for the backend of the Access API in C2. |
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// The top-level class is responsible for performing raw accesses. The |
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// various GC barrier sets inherit from the BarrierSetC2 class to sprinkle |
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// barriers into the accesses. |
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class BarrierSetC2: public CHeapObj<mtGC> { |
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protected: |
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virtual void resolve_address(C2Access& access) const; |
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virtual Node* store_at_resolved(C2Access& access, C2AccessValue& val) const; |
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virtual Node* load_at_resolved(C2Access& access, const Type* val_type) const; |
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virtual Node* atomic_cmpxchg_val_at_resolved(C2AtomicParseAccess& access, Node* expected_val, |
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Node* new_val, const Type* val_type) const; |
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virtual Node* atomic_cmpxchg_bool_at_resolved(C2AtomicParseAccess& access, Node* expected_val, |
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Node* new_val, const Type* value_type) const; |
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virtual Node* atomic_xchg_at_resolved(C2AtomicParseAccess& access, Node* new_val, const Type* val_type) const; |
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virtual Node* atomic_add_at_resolved(C2AtomicParseAccess& access, Node* new_val, const Type* val_type) const; |
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void pin_atomic_op(C2AtomicParseAccess& access) const; |
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public: |
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// This is the entry-point for the backend to perform accesses through the Access API. |
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virtual Node* store_at(C2Access& access, C2AccessValue& val) const; |
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virtual Node* load_at(C2Access& access, const Type* val_type) const; |
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virtual Node* atomic_cmpxchg_val_at(C2AtomicParseAccess& access, Node* expected_val, |
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Node* new_val, const Type* val_type) const; |
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virtual Node* atomic_cmpxchg_bool_at(C2AtomicParseAccess& access, Node* expected_val, |
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Node* new_val, const Type* val_type) const; |
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virtual Node* atomic_xchg_at(C2AtomicParseAccess& access, Node* new_val, const Type* value_type) const; |
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virtual Node* atomic_add_at(C2AtomicParseAccess& access, Node* new_val, const Type* value_type) const; |
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virtual void clone(GraphKit* kit, Node* src, Node* dst, Node* size, bool is_array) const; |
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virtual Node* resolve(GraphKit* kit, Node* n, DecoratorSet decorators) const { return n; } |
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virtual Node* obj_allocate(PhaseMacroExpand* macro, Node* ctrl, Node* mem, Node* toobig_false, Node* size_in_bytes, |
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Node*& i_o, Node*& needgc_ctrl, |
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Node*& fast_oop_ctrl, Node*& fast_oop_rawmem, |
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intx prefetch_lines) const; |
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virtual Node* ideal_node(PhaseGVN* phase, Node* n, bool can_reshape) const { return NULL; } |
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virtual Node* identity_node(PhaseGVN* phase, Node* n) const { return n; } |
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// These are general helper methods used by C2 |
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enum ArrayCopyPhase { |
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Parsing, |
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Optimization, |
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Expansion |
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}; |
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virtual bool array_copy_requires_gc_barriers(bool tightly_coupled_alloc, BasicType type, bool is_clone, ArrayCopyPhase phase) const { return false; } |
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virtual void clone_barrier_at_expansion(ArrayCopyNode* ac, Node* call, PhaseIterGVN& igvn) const; |
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// Support for GC barriers emitted during parsing |
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virtual bool has_load_barriers() const { return false; } |
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virtual bool is_gc_barrier_node(Node* node) const { return false; } |
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virtual Node* step_over_gc_barrier(Node* c) const { return c; } |
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// Support for macro expanded GC barriers |
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virtual void register_potential_barrier_node(Node* node) const { } |
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virtual void unregister_potential_barrier_node(Node* node) const { } |
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virtual void eliminate_gc_barrier(PhaseMacroExpand* macro, Node* node) const { } |
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virtual void enqueue_useful_gc_barrier(PhaseIterGVN* igvn, Node* node) const {} |
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virtual void eliminate_useless_gc_barriers(Unique_Node_List &useful, Compile* C) const {} |
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virtual void add_users_to_worklist(Unique_Node_List* worklist) const {} |
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// Allow barrier sets to have shared state that is preserved across a compilation unit. |
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// This could for example comprise macro nodes to be expanded during macro expansion. |
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virtual void* create_barrier_state(Arena* comp_arena) const { return NULL; } |
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// If the BarrierSetC2 state has kept macro nodes in its compilation unit state to be |
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// expanded later, then now is the time to do so. |
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virtual bool expand_macro_nodes(PhaseMacroExpand* macro) const { return false; } |
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enum CompilePhase { |
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BeforeOptimize, /* post_parse = true */ |
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BeforeExpand, /* post_parse = false */ |
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BeforeCodeGen |
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}; |
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virtual void verify_gc_barriers(Compile* compile, CompilePhase phase) const {} |
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virtual bool flatten_gc_alias_type(const TypePtr*& adr_type) const { return false; } |
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#ifdef ASSERT |
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virtual bool verify_gc_alias_type(const TypePtr* adr_type, int offset) const { return false; } |
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#endif |
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}; |
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#endif // SHARE_GC_SHARED_C2_BARRIERSETC2_HPP |