jdk8-mips64-public/hotspot: src/share/vm/code/vmreg.hpp@246d977b51f2 (annotated)

src/share/vm/code/vmreg.hpp@246d977b51f2 (annotated)

src/share/vm/code/vmreg.hpp

Mon, 25 Jun 2012 21:33:35 -0400

author: coleenp
date: Mon, 25 Jun 2012 21:33:35 -0400
changeset 3875: 246d977b51f2
parent 2708: 1d1603768966
child 3929: 2c368ea3e844
permissions: -rw-r--r--

7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
Summary: Cannot delete _buckets and HashtableEntries in shared space (CDS)
Reviewed-by: acorn, kvn, dlong, dcubed, kamg

 /*
  * Copyright (c) 1998, 2011, 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_VMREG_HPP
 #define SHARE_VM_CODE_VMREG_HPP
 #include "memory/allocation.hpp"
 #include "utilities/globalDefinitions.hpp"
 #ifdef TARGET_ARCH_x86
 # include "register_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "register_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "register_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "register_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "register_ppc.hpp"
 #endif
 #ifdef COMPILER2
 #include "opto/adlcVMDeps.hpp"
 #include "utilities/ostream.hpp"
 #ifdef TARGET_ARCH_MODEL_x86_32
 # include "adfiles/adGlobals_x86_32.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_x86_64
 # include "adfiles/adGlobals_x86_64.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_sparc
 # include "adfiles/adGlobals_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_zero
 # include "adfiles/adGlobals_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_arm
 # include "adfiles/adGlobals_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_MODEL_ppc
 # include "adfiles/adGlobals_ppc.hpp"
 #endif
 #endif
 //------------------------------VMReg------------------------------------------
 // The VM uses 'unwarped' stack slots; the compiler uses 'warped' stack slots.
 // Register numbers below VMRegImpl::stack0 are the same for both.  Register
 // numbers above stack0 are either warped (in the compiler) or unwarped
 // (in the VM).  Unwarped numbers represent stack indices, offsets from
 // the current stack pointer.  Warped numbers are required during compilation
 // when we do not yet know how big the frame will be.
 class VMRegImpl;
 typedef VMRegImpl* VMReg;
 class VMRegImpl {
 // friend class OopMap;
 friend class VMStructs;
 friend class OptoReg;
 // friend class Location;
 private:
   enum {
     BAD = -1
   };
   static VMReg stack0;
   // Names for registers
   static const char *regName[];
   static const int register_count;
 public:
   static VMReg  as_VMReg(int val, bool bad_ok = false) { assert(val > BAD || bad_ok, "invalid"); return (VMReg) (intptr_t) val; }
   const char*  name() {
     if (is_reg()) {
       return regName[value()];
     } else if (!is_valid()) {
       return "BAD";
     } else {
       // shouldn't really be called with stack
       return "STACKED REG";
     }
   }
   static VMReg Bad() { return (VMReg) (intptr_t) BAD; }
   bool is_valid() const { return ((intptr_t) this) != BAD; }
   bool is_stack() const { return (intptr_t) this >= (intptr_t) stack0; }
   bool is_reg()   const { return is_valid() && !is_stack(); }
   // A concrete register is a value that returns true for is_reg() and is
   // also a register you could use in the assembler. On machines with
   // 64bit registers only one half of the VMReg (and OptoReg) is considered
   // concrete.
   bool is_concrete();
   // VMRegs are 4 bytes wide on all platforms
   static const int stack_slot_size;
   static const int slots_per_word;
   // This really ought to check that the register is "real" in the sense that
   // we don't try and get the VMReg number of a physical register that doesn't
   // have an expressible part. That would be pd specific code
   VMReg next() {
     assert((is_reg() && value() < stack0->value() - 1) || is_stack(), "must be");
     return (VMReg)(intptr_t)(value() + 1);
   }
   VMReg prev() {
     assert((is_stack() && value() > stack0->value()) || (is_reg() && value() != 0), "must be");
     return (VMReg)(intptr_t)(value() - 1);
   }
   intptr_t value() const         {return (intptr_t) this; }
   void print_on(outputStream* st) const;
   void print() const { print_on(tty); }
   // bias a stack slot.
   // Typically used to adjust a virtual frame slots by amounts that are offset by
   // amounts that are part of the native abi. The VMReg must be a stack slot
   // and the result must be also.
   VMReg bias(int offset) {
     assert(is_stack(), "must be");
     // VMReg res = VMRegImpl::as_VMReg(value() + offset);
     VMReg res = stack2reg(reg2stack() + offset);
     assert(res->is_stack(), "must be");
     return res;
   }
   // Convert register numbers to stack slots and vice versa
   static VMReg stack2reg( int idx ) {
     return (VMReg) (intptr_t) (stack0->value() + idx);
   }
   uintptr_t reg2stack() {
     assert( is_stack(), "Not a stack-based register" );
     return value() - stack0->value();
   }
   static void set_regName();
 #ifdef TARGET_ARCH_x86
 # include "vmreg_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "vmreg_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "vmreg_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "vmreg_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "vmreg_ppc.hpp"
 #endif
 };
 //---------------------------VMRegPair-------------------------------------------
 // Pairs of 32-bit registers for arguments.
 // SharedRuntime::java_calling_convention will overwrite the structs with
 // the calling convention's registers.  VMRegImpl::Bad is returned for any
 // unused 32-bit register.  This happens for the unused high half of Int
 // arguments, or for 32-bit pointers or for longs in the 32-bit sparc build
 // (which are passed to natives in low 32-bits of e.g. O0/O1 and the high
 // 32-bits of O0/O1 are set to VMRegImpl::Bad).  Longs in one register & doubles
 // always return a high and a low register, as do 64-bit pointers.
 //
 class VMRegPair {
 private:
   VMReg _second;
   VMReg _first;
 public:
   void set_bad (                   ) { _second=VMRegImpl::Bad(); _first=VMRegImpl::Bad(); }
   void set1    (         VMReg v  ) { _second=VMRegImpl::Bad(); _first=v; }
   void set2    (         VMReg v  ) { _second=v->next();  _first=v; }
   void set_pair( VMReg second, VMReg first    ) { _second= second;    _first= first; }
   void set_ptr ( VMReg ptr ) {
 #ifdef _LP64
     _second = ptr->next();
 #else
     _second = VMRegImpl::Bad();
 #endif
     _first = ptr;
   }
   // Return true if single register, even if the pair is really just adjacent stack slots
   bool is_single_reg() const {
     return (_first->is_valid()) && (_first->value() + 1 == _second->value());
   }
   // Return true if single stack based "register" where the slot alignment matches input alignment
   bool is_adjacent_on_stack(int alignment) const {
     return (_first->is_stack() && (_first->value() + 1 == _second->value()) && ((_first->value() & (alignment-1)) == 0));
   }
   // Return true if single stack based "register" where the slot alignment matches input alignment
   bool is_adjacent_aligned_on_stack(int alignment) const {
     return (_first->is_stack() && (_first->value() + 1 == _second->value()) && ((_first->value() & (alignment-1)) == 0));
   }
   // Return true if single register but adjacent stack slots do not count
   bool is_single_phys_reg() const {
     return (_first->is_reg() && (_first->value() + 1 == _second->value()));
   }
   VMReg second() const { return _second; }
   VMReg first()  const { return _first; }
   VMRegPair(VMReg s, VMReg f) {  _second = s; _first = f; }
   VMRegPair(VMReg f) { _second = VMRegImpl::Bad(); _first = f; }
   VMRegPair() { _second = VMRegImpl::Bad(); _first = VMRegImpl::Bad(); }
 };
 #endif // SHARE_VM_CODE_VMREG_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/code/vmreg.hpp@246d977b51f2 (annotated)

src/share/vm/code/vmreg.hpp