1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/code/location.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,124 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_CODE_LOCATION_HPP
1.29 +#define SHARE_VM_CODE_LOCATION_HPP
1.30 +
1.31 +#include "asm/assembler.hpp"
1.32 +#include "code/vmreg.hpp"
1.33 +#include "memory/allocation.hpp"
1.34 +
1.35 +// A Location describes a concrete machine variable location
1.36 +// (such as integer or floating point register or a stack-held
1.37 +// variable). Used when generating debug-information for nmethods.
1.38 +//
1.39 +// Encoding:
1.40 +//
1.41 +// bits (use low bits for best compression):
1.42 +// Type: [3..0]
1.43 +// Where: [4]
1.44 +// Offset: [31..5]
1.45 +
1.46 +class Location VALUE_OBJ_CLASS_SPEC {
1.47 + friend class VMStructs;
1.48 + public:
1.49 + enum Where {
1.50 + on_stack,
1.51 + in_register
1.52 + };
1.53 +
1.54 + enum Type {
1.55 + invalid, // Invalid location
1.56 + normal, // Ints, floats, double halves
1.57 + oop, // Oop (please GC me!)
1.58 + int_in_long, // Integer held in long register
1.59 + lng, // Long held in one register
1.60 + float_in_dbl, // Float held in double register
1.61 + dbl, // Double held in one register
1.62 + addr, // JSR return address
1.63 + narrowoop // Narrow Oop (please GC me!)
1.64 + };
1.65 +
1.66 +
1.67 + private:
1.68 + enum {
1.69 + TYPE_MASK = (juint) 0x0F,
1.70 + TYPE_SHIFT = 0,
1.71 + WHERE_MASK = (juint) 0x10,
1.72 + WHERE_SHIFT = 4,
1.73 + OFFSET_MASK = (juint) 0xFFFFFFE0,
1.74 + OFFSET_SHIFT = 5
1.75 + };
1.76 +
1.77 + juint _value;
1.78 +
1.79 + // Create a bit-packed Location
1.80 + Location(Where where_, Type type_, unsigned offset_) {
1.81 + set(where_, type_, offset_);
1.82 + assert( where () == where_ , "" );
1.83 + assert( type () == type_ , "" );
1.84 + assert( offset() == offset_, "" );
1.85 + }
1.86 +
1.87 + inline void set(Where where_, Type type_, unsigned offset_) {
1.88 + _value = (juint) ((where_ << WHERE_SHIFT) |
1.89 + (type_ << TYPE_SHIFT) |
1.90 + ((offset_ << OFFSET_SHIFT) & OFFSET_MASK));
1.91 + }
1.92 +
1.93 + public:
1.94 +
1.95 + // Stack location Factory. Offset is 4-byte aligned; remove low bits
1.96 + static Location new_stk_loc( Type t, int offset ) { return Location(on_stack,t,offset>>LogBytesPerInt); }
1.97 + // Register location Factory
1.98 + static Location new_reg_loc( Type t, VMReg reg ) { return Location(in_register, t, reg->value()); }
1.99 + // Default constructor
1.100 + Location() { set(on_stack,invalid,0); }
1.101 +
1.102 + // Bit field accessors
1.103 + Where where() const { return (Where) ((_value & WHERE_MASK) >> WHERE_SHIFT);}
1.104 + Type type() const { return (Type) ((_value & TYPE_MASK) >> TYPE_SHIFT); }
1.105 + unsigned offset() const { return (unsigned) ((_value & OFFSET_MASK) >> OFFSET_SHIFT); }
1.106 +
1.107 + // Accessors
1.108 + bool is_register() const { return where() == in_register; }
1.109 + bool is_stack() const { return where() == on_stack; }
1.110 +
1.111 + int stack_offset() const { assert(where() == on_stack, "wrong Where"); return offset()<<LogBytesPerInt; }
1.112 + int register_number() const { assert(where() == in_register, "wrong Where"); return offset() ; }
1.113 +
1.114 + VMReg reg() const { assert(where() == in_register, "wrong Where"); return VMRegImpl::as_VMReg(offset()) ; }
1.115 +
1.116 + // Printing
1.117 + void print_on(outputStream* st) const;
1.118 +
1.119 + // Serialization of debugging information
1.120 + Location(DebugInfoReadStream* stream);
1.121 + void write_on(DebugInfoWriteStream* stream);
1.122 +
1.123 + // check
1.124 + static bool legal_offset_in_bytes(int offset_in_bytes);
1.125 +};
1.126 +
1.127 +#endif // SHARE_VM_CODE_LOCATION_HPP
