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/*
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* Copyright 1997-2008 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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# include "incls/_precompiled.incl"
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# include "incls/_stackValue.cpp.incl"
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StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv) {
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if (sv->is_location()) {
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// Stack or register value
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Location loc = ((LocationValue *)sv)->location();
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#ifdef SPARC
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// %%%%% Callee-save floats will NOT be working on a Sparc until we
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// handle the case of a 2 floats in a single double register.
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assert( !(loc.is_register() && loc.type() == Location::float_in_dbl), "Sparc does not handle callee-save floats yet" );
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#endif // SPARC
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// First find address of value
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address value_addr = loc.is_register()
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// Value was in a callee-save register
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? reg_map->location(VMRegImpl::as_VMReg(loc.register_number()))
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// Else value was directly saved on the stack. The frame's original stack pointer,
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// before any extension by its callee (due to Compiler1 linkage on SPARC), must be used.
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: ((address)fr->unextended_sp()) + loc.stack_offset();
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// Then package it right depending on type
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// Note: the transfer of the data is thru a union that contains
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// an intptr_t. This is because an interpreter stack slot is
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// really an intptr_t. The use of a union containing an intptr_t
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// ensures that on a 64 bit platform we have proper alignment
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// and that we store the value where the interpreter will expect
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// to find it (i.e. proper endian). Similarly on a 32bit platform
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// using the intptr_t ensures that when a value is larger than
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// a stack slot (jlong/jdouble) that we capture the proper part
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// of the value for the stack slot in question.
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//
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switch( loc.type() ) {
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case Location::float_in_dbl: { // Holds a float in a double register?
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// The callee has no clue whether the register holds a float,
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// double or is unused. He always saves a double. Here we know
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// a double was saved, but we only want a float back. Narrow the
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// saved double to the float that the JVM wants.
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assert( loc.is_register(), "floats always saved to stack in 1 word" );
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union { intptr_t p; jfloat jf; } value;
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value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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value.jf = (jfloat) *(jdouble*) value_addr;
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return new StackValue(value.p); // 64-bit high half is stack junk
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}
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case Location::int_in_long: { // Holds an int in a long register?
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// The callee has no clue whether the register holds an int,
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// long or is unused. He always saves a long. Here we know
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// a long was saved, but we only want an int back. Narrow the
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// saved long to the int that the JVM wants.
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assert( loc.is_register(), "ints always saved to stack in 1 word" );
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union { intptr_t p; jint ji;} value;
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value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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value.ji = (jint) *(jlong*) value_addr;
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return new StackValue(value.p); // 64-bit high half is stack junk
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}
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#ifdef _LP64
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case Location::dbl:
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// Double value in an aligned adjacent pair
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return new StackValue(*(intptr_t*)value_addr);
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case Location::lng:
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// Long value in an aligned adjacent pair
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return new StackValue(*(intptr_t*)value_addr);
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case Location::narrowoop: {
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union { intptr_t p; narrowOop noop;} value;
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value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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if (loc.is_register()) {
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// The callee has no clue whether the register holds an int,
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// long or is unused. He always saves a long. Here we know
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// a long was saved, but we only want an int back. Narrow the
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// saved long to the int that the JVM wants.
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value.noop = (narrowOop) *(julong*) value_addr;
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} else {
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value.noop = *(narrowOop*) value_addr;
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}
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// Decode narrowoop and wrap a handle around the oop
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Handle h(oopDesc::decode_heap_oop(value.noop));
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return new StackValue(h);
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}
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#endif
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case Location::oop: {
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Handle h(*(oop *)value_addr); // Wrap a handle around the oop
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return new StackValue(h);
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}
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case Location::addr: {
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ShouldNotReachHere(); // both C1 and C2 now inline jsrs
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}
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case Location::normal: {
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// Just copy all other bits straight through
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union { intptr_t p; jint ji;} value;
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value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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value.ji = *(jint*)value_addr;
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return new StackValue(value.p);
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}
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case Location::invalid:
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return new StackValue();
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default:
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ShouldNotReachHere();
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}
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} else if (sv->is_constant_int()) {
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// Constant int: treat same as register int.
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union { intptr_t p; jint ji;} value;
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value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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value.ji = (jint)((ConstantIntValue*)sv)->value();
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return new StackValue(value.p);
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} else if (sv->is_constant_oop()) {
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// constant oop
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return new StackValue(((ConstantOopReadValue *)sv)->value());
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#ifdef _LP64
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} else if (sv->is_constant_double()) {
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// Constant double in a single stack slot
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union { intptr_t p; double d; } value;
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value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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value.d = ((ConstantDoubleValue *)sv)->value();
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return new StackValue(value.p);
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} else if (sv->is_constant_long()) {
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// Constant long in a single stack slot
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union { intptr_t p; jlong jl; } value;
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value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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value.jl = ((ConstantLongValue *)sv)->value();
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return new StackValue(value.p);
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#endif
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} else if (sv->is_object()) {
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return new StackValue(((ObjectValue *)sv)->value());
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}
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// Unknown ScopeValue type
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ShouldNotReachHere();
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return new StackValue((intptr_t) 0); // dummy
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}
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BasicLock* StackValue::resolve_monitor_lock(const frame* fr, Location location) {
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assert(location.is_stack(), "for now we only look at the stack");
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int word_offset = location.stack_offset() / wordSize;
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// (stack picture)
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// high: [ ] word_offset + 1
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// low [ ] word_offset
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//
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// sp-> [ ] 0
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// the word_offset is the distance from the stack pointer to the lowest address
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// The frame's original stack pointer, before any extension by its callee
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// (due to Compiler1 linkage on SPARC), must be used.
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return (BasicLock*) (fr->unextended_sp() + word_offset);
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}
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#ifndef PRODUCT
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void StackValue::print_on(outputStream* st) const {
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switch(_type) {
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case T_INT:
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st->print("%d (int) %f (float) %x (hex)", *(int *)&_i, *(float *)&_i, *(int *)&_i);
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break;
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case T_OBJECT:
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_o()->print_value_on(st);
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st->print(" <" INTPTR_FORMAT ">", (address)_o());
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break;
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case T_CONFLICT:
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st->print("conflict");
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break;
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default:
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ShouldNotReachHere();
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}
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}
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#endif
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