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