jdk8-mips64-public/hotspot: src/share/vm/code/compiledIC.hpp@f90c822e73f8 (annotated)

src/share/vm/code/compiledIC.hpp@f90c822e73f8 (annotated)

src/share/vm/code/compiledIC.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 1: 2d8a650513c2
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_CODE_COMPILEDIC_HPP
 #define SHARE_VM_CODE_COMPILEDIC_HPP
 #include "interpreter/linkResolver.hpp"
 #include "oops/compiledICHolder.hpp"
 #ifdef TARGET_ARCH_x86
 # include "nativeInst_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "nativeInst_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "nativeInst_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "nativeInst_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "nativeInst_ppc.hpp"
 #endif
 //-----------------------------------------------------------------------------
 // The CompiledIC represents a compiled inline cache.
 //
 // In order to make patching of the inline cache MT-safe, we only allow the following
 // transitions (when not at a safepoint):
 //
 //
 //         [1] --<--  Clean -->---  [1]
 //            /       (null)      \
 //           /                     \      /-<-\
 //          /          [2]          \    /     \
 //      Interpreted  ---------> Monomorphic     | [3]
 //  (CompiledICHolder*)            (Klass*)     |
 //          \                        /   \     /
 //       [4] \                      / [4] \->-/
 //            \->-  Megamorphic -<-/
 //                  (Method*)
 //
 // The text in paranteses () refere to the value of the inline cache receiver (mov instruction)
 //
 // The numbers in square brackets refere to the kind of transition:
 // [1]: Initial fixup. Receiver it found from debug information
 // [2]: Compilation of a method
 // [3]: Recompilation of a method (note: only entry is changed. The Klass* must stay the same)
 // [4]: Inline cache miss. We go directly to megamorphic call.
 //
 // The class automatically inserts transition stubs (using the InlineCacheBuffer) when an MT-unsafe
 // transition is made to a stub.
 //
 class CompiledIC;
 class ICStub;
 class CompiledICInfo : public StackObj {
  private:
   address _entry;              // entry point for call
   void*   _cached_value;         // Value of cached_value (either in stub or inline cache)
   bool    _is_icholder;          // Is the cached value a CompiledICHolder*
   bool    _is_optimized;       // it is an optimized virtual call (i.e., can be statically bound)
   bool    _to_interpreter;     // Call it to interpreter
   bool    _release_icholder;
  public:
   address entry() const        { return _entry; }
   Metadata*    cached_metadata() const         { assert(!_is_icholder, ""); return (Metadata*)_cached_value; }
   CompiledICHolder*    claim_cached_icholder() {
     assert(_is_icholder, "");
     assert(_cached_value != NULL, "must be non-NULL");
     _release_icholder = false;
     CompiledICHolder* icholder = (CompiledICHolder*)_cached_value;
     icholder->claim();
     return icholder;
   }
   bool    is_optimized() const { return _is_optimized; }
   bool         to_interpreter() const  { return _to_interpreter; }
   void set_compiled_entry(address entry, Klass* klass, bool is_optimized) {
     _entry      = entry;
     _cached_value = (void*)klass;
     _to_interpreter = false;
     _is_icholder = false;
     _is_optimized = is_optimized;
     _release_icholder = false;
   }
   void set_interpreter_entry(address entry, Method* method) {
     _entry      = entry;
     _cached_value = (void*)method;
     _to_interpreter = true;
     _is_icholder = false;
     _is_optimized = true;
     _release_icholder = false;
   }
   void set_icholder_entry(address entry, CompiledICHolder* icholder) {
     _entry      = entry;
     _cached_value = (void*)icholder;
     _to_interpreter = true;
     _is_icholder = true;
     _is_optimized = false;
     _release_icholder = true;
   }
   CompiledICInfo(): _entry(NULL), _cached_value(NULL), _is_icholder(false),
                     _to_interpreter(false), _is_optimized(false), _release_icholder(false) {
   }
   ~CompiledICInfo() {
     // In rare cases the info is computed but not used, so release any
     // CompiledICHolder* that was created
     if (_release_icholder) {
       assert(_is_icholder, "must be");
       CompiledICHolder* icholder = (CompiledICHolder*)_cached_value;
       icholder->claim();
       delete icholder;
     }
   }
 };
 class CompiledIC: public ResourceObj {
   friend class InlineCacheBuffer;
   friend class ICStub;
  private:
   NativeCall*   _ic_call;       // the call instruction
   NativeMovConstReg* _value;    // patchable value cell for this IC
   bool          _is_optimized;  // an optimized virtual call (i.e., no compiled IC)
   CompiledIC(nmethod* nm, NativeCall* ic_call);
   static bool is_icholder_entry(address entry);
   // low-level inline-cache manipulation. Cannot be accessed directly, since it might not be MT-safe
   // to change an inline-cache. These changes the underlying inline-cache directly. They *newer* make
   // changes to a transition stub.
   void internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder);
   void set_ic_destination(ICStub* stub);
   void set_ic_destination(address entry_point) {
     assert(_is_optimized, "use set_ic_destination_and_value instead");
     internal_set_ic_destination(entry_point, false, NULL, false);
   }
   // This only for use by ICStubs where the type of the value isn't known
   void set_ic_destination_and_value(address entry_point, void* value) {
     internal_set_ic_destination(entry_point, false, value, is_icholder_entry(entry_point));
   }
   void set_ic_destination_and_value(address entry_point, Metadata* value) {
     internal_set_ic_destination(entry_point, false, value, false);
   }
   void set_ic_destination_and_value(address entry_point, CompiledICHolder* value) {
     internal_set_ic_destination(entry_point, false, value, true);
   }
   // Reads the location of the transition stub. This will fail with an assertion, if no transition stub is
   // associated with the inline cache.
   address stub_address() const;
   bool is_in_transition_state() const;  // Use InlineCacheBuffer
  public:
   // conversion (machine PC to CompiledIC*)
   friend CompiledIC* CompiledIC_before(nmethod* nm, address return_addr);
   friend CompiledIC* CompiledIC_at(nmethod* nm, address call_site);
   friend CompiledIC* CompiledIC_at(Relocation* call_site);
   // This is used to release CompiledICHolder*s from nmethods that
   // are about to be freed.  The callsite might contain other stale
   // values of other kinds so it must be careful.
   static void cleanup_call_site(virtual_call_Relocation* call_site);
   static bool is_icholder_call_site(virtual_call_Relocation* call_site);
   // Return the cached_metadata/destination associated with this inline cache. If the cache currently points
   // to a transition stub, it will read the values from the transition stub.
   void* cached_value() const;
   CompiledICHolder* cached_icholder() const {
     assert(is_icholder_call(), "must be");
     return (CompiledICHolder*) cached_value();
   }
   Metadata* cached_metadata() const {
     assert(!is_icholder_call(), "must be");
     return (Metadata*) cached_value();
   }
   address ic_destination() const;
   bool is_optimized() const   { return _is_optimized; }
   // State
   bool is_clean() const;
   bool is_megamorphic() const;
   bool is_call_to_compiled() const;
   bool is_call_to_interpreted() const;
   bool is_icholder_call() const;
   address end_of_call() { return  _ic_call->return_address(); }
   // MT-safe patching of inline caches. Note: Only safe to call is_xxx when holding the CompiledIC_ock
   // so you are guaranteed that no patching takes place. The same goes for verify.
   //
   // Note: We do not provide any direct access to the stub code, to prevent parts of the code
   // to manipulate the inline cache in MT-unsafe ways.
   //
   // They all takes a TRAP argument, since they can cause a GC if the inline-cache buffer is full.
   //
   void set_to_clean();  // Can only be called during a safepoint operation
   void set_to_monomorphic(CompiledICInfo& info);
   // Returns true if successful and false otherwise. The call can fail if memory
   // allocation in the code cache fails.
   bool set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS);
   static void compute_monomorphic_entry(methodHandle method, KlassHandle receiver_klass,
                                         bool is_optimized, bool static_bound, CompiledICInfo& info, TRAPS);
   // Location
   address instruction_address() const { return _ic_call->instruction_address(); }
   // Misc
   void print()             PRODUCT_RETURN;
   void print_compiled_ic() PRODUCT_RETURN;
   void verify()            PRODUCT_RETURN;
 };
 inline CompiledIC* CompiledIC_before(nmethod* nm, address return_addr) {
   CompiledIC* c_ic = new CompiledIC(nm, nativeCall_before(return_addr));
   c_ic->verify();
   return c_ic;
 }
 inline CompiledIC* CompiledIC_at(nmethod* nm, address call_site) {
   CompiledIC* c_ic = new CompiledIC(nm, nativeCall_at(call_site));
   c_ic->verify();
   return c_ic;
 }
 inline CompiledIC* CompiledIC_at(Relocation* call_site) {
   assert(call_site->type() == relocInfo::virtual_call_type ||
          call_site->type() == relocInfo::opt_virtual_call_type, "wrong reloc. info");
   CompiledIC* c_ic = new CompiledIC(call_site->code(), nativeCall_at(call_site->addr()));
   c_ic->verify();
   return c_ic;
 }
 //-----------------------------------------------------------------------------
 // The CompiledStaticCall represents a call to a static method in the compiled
 //
 // Transition diagram of a static call site is somewhat simpler than for an inlined cache:
 //
 //
 //           -----<----- Clean ----->-----
 //          /                             \
 //         /                               \
 //    compilled code <------------> interpreted code
 //
 //  Clean:            Calls directly to runtime method for fixup
 //  Compiled code:    Calls directly to compiled code
 //  Interpreted code: Calls to stub that set Method* reference
 //
 //
 class CompiledStaticCall;
 class StaticCallInfo {
  private:
   address      _entry;          // Entrypoint
   methodHandle _callee;         // Callee (used when calling interpreter)
   bool         _to_interpreter; // call to interpreted method (otherwise compiled)
   friend class CompiledStaticCall;
  public:
   address      entry() const    { return _entry;  }
   methodHandle callee() const   { return _callee; }
 };
 class CompiledStaticCall: public NativeCall {
   friend class CompiledIC;
   // Also used by CompiledIC
   void set_to_interpreted(methodHandle callee, address entry);
   bool is_optimized_virtual();
  public:
   friend CompiledStaticCall* compiledStaticCall_before(address return_addr);
   friend CompiledStaticCall* compiledStaticCall_at(address native_call);
   friend CompiledStaticCall* compiledStaticCall_at(Relocation* call_site);
   // Code
   static void emit_to_interp_stub(CodeBuffer &cbuf);
   static int to_interp_stub_size();
   static int reloc_to_interp_stub();
   // State
   bool is_clean() const;
   bool is_call_to_compiled() const;
   bool is_call_to_interpreted() const;
   // Clean static call (will force resolving on next use)
   void set_to_clean();
   // Set state. The entry must be the same, as computed by compute_entry.
   // Computation and setting is split up, since the actions are separate during
   // a OptoRuntime::resolve_xxx.
   void set(const StaticCallInfo& info);
   // Compute entry point given a method
   static void compute_entry(methodHandle m, StaticCallInfo& info);
   // Stub support
   address find_stub();
   static void set_stub_to_clean(static_stub_Relocation* static_stub);
   // Misc.
   void print()  PRODUCT_RETURN;
   void verify() PRODUCT_RETURN;
 };
 inline CompiledStaticCall* compiledStaticCall_before(address return_addr) {
   CompiledStaticCall* st = (CompiledStaticCall*)nativeCall_before(return_addr);
   st->verify();
   return st;
 }
 inline CompiledStaticCall* compiledStaticCall_at(address native_call) {
   CompiledStaticCall* st = (CompiledStaticCall*)native_call;
   st->verify();
   return st;
 }
 inline CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) {
   return compiledStaticCall_at(call_site->addr());
 }
 #endif // SHARE_VM_CODE_COMPILEDIC_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/code/compiledIC.hpp@f90c822e73f8 (annotated)

src/share/vm/code/compiledIC.hpp