8006fe8f75
Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
125 lines
4.3 KiB
C++
125 lines
4.3 KiB
C++
/*
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* Copyright (c) 1997, 2010, 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_VM_CODE_LOCATION_HPP
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#define SHARE_VM_CODE_LOCATION_HPP
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#include "asm/assembler.hpp"
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#include "code/vmreg.hpp"
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#include "memory/allocation.hpp"
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// A Location describes a concrete machine variable location
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// (such as integer or floating point register or a stack-held
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// variable). Used when generating debug-information for nmethods.
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//
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// Encoding:
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//
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// bits (use low bits for best compression):
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// Type: [3..0]
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// Where: [4]
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// Offset: [31..5]
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class Location VALUE_OBJ_CLASS_SPEC {
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friend class VMStructs;
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public:
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enum Where {
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on_stack,
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in_register
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};
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enum Type {
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invalid, // Invalid location
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normal, // Ints, floats, double halves
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oop, // Oop (please GC me!)
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int_in_long, // Integer held in long register
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lng, // Long held in one register
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float_in_dbl, // Float held in double register
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dbl, // Double held in one register
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addr, // JSR return address
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narrowoop // Narrow Oop (please GC me!)
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};
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private:
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enum {
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TYPE_MASK = (juint) 0x0F,
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TYPE_SHIFT = 0,
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WHERE_MASK = (juint) 0x10,
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WHERE_SHIFT = 4,
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OFFSET_MASK = (juint) 0xFFFFFFE0,
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OFFSET_SHIFT = 5
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};
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juint _value;
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// Create a bit-packed Location
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Location(Where where_, Type type_, unsigned offset_) {
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set(where_, type_, offset_);
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assert( where () == where_ , "" );
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assert( type () == type_ , "" );
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assert( offset() == offset_, "" );
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}
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inline void set(Where where_, Type type_, unsigned offset_) {
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_value = (juint) ((where_ << WHERE_SHIFT) |
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(type_ << TYPE_SHIFT) |
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((offset_ << OFFSET_SHIFT) & OFFSET_MASK));
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}
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public:
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// Stack location Factory. Offset is 4-byte aligned; remove low bits
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static Location new_stk_loc( Type t, int offset ) { return Location(on_stack,t,offset>>LogBytesPerInt); }
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// Register location Factory
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static Location new_reg_loc( Type t, VMReg reg ) { return Location(in_register, t, reg->value()); }
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// Default constructor
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Location() { set(on_stack,invalid,0); }
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// Bit field accessors
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Where where() const { return (Where) ((_value & WHERE_MASK) >> WHERE_SHIFT);}
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Type type() const { return (Type) ((_value & TYPE_MASK) >> TYPE_SHIFT); }
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unsigned offset() const { return (unsigned) ((_value & OFFSET_MASK) >> OFFSET_SHIFT); }
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// Accessors
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bool is_register() const { return where() == in_register; }
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bool is_stack() const { return where() == on_stack; }
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int stack_offset() const { assert(where() == on_stack, "wrong Where"); return offset()<<LogBytesPerInt; }
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int register_number() const { assert(where() == in_register, "wrong Where"); return offset() ; }
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VMReg reg() const { assert(where() == in_register, "wrong Where"); return VMRegImpl::as_VMReg(offset()) ; }
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// Printing
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void print_on(outputStream* st) const;
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// Serialization of debugging information
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Location(DebugInfoReadStream* stream);
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void write_on(DebugInfoWriteStream* stream);
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// check
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static bool legal_offset_in_bytes(int offset_in_bytes);
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};
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#endif // SHARE_VM_CODE_LOCATION_HPP
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