70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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public:
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// Sentinel placed in the code for interpreter returns so
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// that i2c adapters and osr code can recognize an interpreter
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// return address and convert the return to a specialized
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// block of code to handle compiedl return values and cleaning
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// the fpu stack.
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static const int return_sentinel;
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static Address::ScaleFactor stackElementScale() {
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return TaggedStackInterpreter? Address::times_8 : Address::times_4;
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}
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// Offset from rsp (which points to the last stack element)
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static int expr_offset_in_bytes(int i) { return stackElementSize()*i ; }
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static int expr_tag_offset_in_bytes(int i) {
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assert(TaggedStackInterpreter, "should not call this");
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return expr_offset_in_bytes(i) + wordSize;
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}
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// Support for Tagged Stacks
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// Stack index relative to tos (which points at value)
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static int expr_index_at(int i) {
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return stackElementWords() * i;
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}
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static int expr_tag_index_at(int i) {
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assert(TaggedStackInterpreter, "should not call this");
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// tag is one word above java stack element
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return stackElementWords() * i + 1;
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}
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// Already negated by c++ interpreter
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static int local_index_at(int i) {
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assert(i<=0, "local direction already negated");
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return stackElementWords() * i + (value_offset_in_bytes()/wordSize);
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}
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static int local_tag_index_at(int i) {
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assert(i<=0, "local direction already negated");
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assert(TaggedStackInterpreter, "should not call this");
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return stackElementWords() * i + (tag_offset_in_bytes()/wordSize);
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}
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