author | coleenp |
Thu, 10 Jan 2019 15:13:51 -0500 | |
changeset 53244 | 9807daeb47c4 |
parent 53149 | 259c36ef27df |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2019, 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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||
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#ifndef SHARE_CODE_LOCATION_HPP |
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#define SHARE_CODE_LOCATION_HPP |
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#include "asm/assembler.hpp" |
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#include "code/vmreg.hpp" |
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class DebugInfoReadStream; |
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class DebugInfoWriteStream; |
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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 { |
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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_CODE_LOCATION_HPP |