aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "code/debugInfo.hpp"
aoqi@0: #include "oops/oop.inline.hpp"
aoqi@0: #include "runtime/frame.inline.hpp"
aoqi@0: #include "runtime/handles.inline.hpp"
aoqi@0: #include "runtime/stackValue.hpp"
aoqi@0: 
aoqi@0: StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv) {
aoqi@0:   if (sv->is_location()) {
aoqi@0:     // Stack or register value
aoqi@0:     Location loc = ((LocationValue *)sv)->location();
aoqi@0: 
aoqi@0: #ifdef SPARC
aoqi@0:     // %%%%% Callee-save floats will NOT be working on a Sparc until we
aoqi@0:     // handle the case of a 2 floats in a single double register.
aoqi@0:     assert( !(loc.is_register() && loc.type() == Location::float_in_dbl), "Sparc does not handle callee-save floats yet" );
aoqi@0: #endif // SPARC
aoqi@0: 
aoqi@0:     // First find address of value
aoqi@0: 
aoqi@0:     address value_addr = loc.is_register()
aoqi@0:       // Value was in a callee-save register
aoqi@0:       ? reg_map->location(VMRegImpl::as_VMReg(loc.register_number()))
aoqi@0:       // Else value was directly saved on the stack. The frame's original stack pointer,
aoqi@0:       // before any extension by its callee (due to Compiler1 linkage on SPARC), must be used.
aoqi@0:       : ((address)fr->unextended_sp()) + loc.stack_offset();
aoqi@0: 
aoqi@0:     // Then package it right depending on type
aoqi@0:     // Note: the transfer of the data is thru a union that contains
aoqi@0:     // an intptr_t. This is because an interpreter stack slot is
aoqi@0:     // really an intptr_t. The use of a union containing an intptr_t
aoqi@0:     // ensures that on a 64 bit platform we have proper alignment
aoqi@0:     // and that we store the value where the interpreter will expect
aoqi@0:     // to find it (i.e. proper endian). Similarly on a 32bit platform
aoqi@0:     // using the intptr_t ensures that when a value is larger than
aoqi@0:     // a stack slot (jlong/jdouble) that we capture the proper part
aoqi@0:     // of the value for the stack slot in question.
aoqi@0:     //
aoqi@0:     switch( loc.type() ) {
aoqi@0:     case Location::float_in_dbl: { // Holds a float in a double register?
aoqi@0:       // The callee has no clue whether the register holds a float,
aoqi@0:       // double or is unused.  He always saves a double.  Here we know
aoqi@0:       // a double was saved, but we only want a float back.  Narrow the
aoqi@0:       // saved double to the float that the JVM wants.
aoqi@0:       assert( loc.is_register(), "floats always saved to stack in 1 word" );
aoqi@0:       union { intptr_t p; jfloat jf; } value;
aoqi@0:       value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
aoqi@0:       value.jf = (jfloat) *(jdouble*) value_addr;
aoqi@0:       return new StackValue(value.p); // 64-bit high half is stack junk
aoqi@0:     }
aoqi@0:     case Location::int_in_long: { // Holds an int in a long register?
aoqi@0:       // The callee has no clue whether the register holds an int,
aoqi@0:       // long or is unused.  He always saves a long.  Here we know
aoqi@0:       // a long was saved, but we only want an int back.  Narrow the
aoqi@0:       // saved long to the int that the JVM wants.
aoqi@0:       assert( loc.is_register(), "ints always saved to stack in 1 word" );
aoqi@0:       union { intptr_t p; jint ji;} value;
aoqi@0:       value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
aoqi@0:       value.ji = (jint) *(jlong*) value_addr;
aoqi@0:       return new StackValue(value.p); // 64-bit high half is stack junk
aoqi@0:     }
aoqi@0: #ifdef _LP64
aoqi@0:     case Location::dbl:
aoqi@0:       // Double value in an aligned adjacent pair
aoqi@0:       return new StackValue(*(intptr_t*)value_addr);
aoqi@0:     case Location::lng:
aoqi@0:       // Long   value in an aligned adjacent pair
aoqi@0:       return new StackValue(*(intptr_t*)value_addr);
aoqi@0:     case Location::narrowoop: {
aoqi@0:       union { intptr_t p; narrowOop noop;} value;
aoqi@0:       value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
aoqi@0:       if (loc.is_register()) {
aoqi@0:         // The callee has no clue whether the register holds an int,
aoqi@0:         // long or is unused.  He always saves a long.  Here we know
aoqi@0:         // a long was saved, but we only want an int back.  Narrow the
aoqi@0:         // saved long to the int that the JVM wants.
aoqi@0:         value.noop =  (narrowOop) *(julong*) value_addr;
aoqi@0:       } else {
aoqi@0:         value.noop = *(narrowOop*) value_addr;
aoqi@0:       }
aoqi@0:       // Decode narrowoop and wrap a handle around the oop
aoqi@0:       Handle h(oopDesc::decode_heap_oop(value.noop));
aoqi@0:       return new StackValue(h);
aoqi@0:     }
aoqi@0: #endif
aoqi@0:     case Location::oop: {
aoqi@0:       oop val = *(oop *)value_addr;
aoqi@0: #ifdef _LP64
aoqi@0:       if (Universe::is_narrow_oop_base(val)) {
aoqi@0:          // Compiled code may produce decoded oop = narrow_oop_base
aoqi@0:          // when a narrow oop implicit null check is used.
aoqi@0:          // The narrow_oop_base could be NULL or be the address
aoqi@0:          // of the page below heap. Use NULL value for both cases.
aoqi@0:          val = (oop)NULL;
aoqi@0:       }
aoqi@0: #endif
aoqi@0:       Handle h(val); // Wrap a handle around the oop
aoqi@0:       return new StackValue(h);
aoqi@0:     }
aoqi@0:     case Location::addr: {
aoqi@0:       ShouldNotReachHere(); // both C1 and C2 now inline jsrs
aoqi@0:     }
aoqi@0:     case Location::normal: {
aoqi@0:       // Just copy all other bits straight through
aoqi@0:       union { intptr_t p; jint ji;} value;
aoqi@0:       value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
aoqi@0:       value.ji = *(jint*)value_addr;
aoqi@0:       return new StackValue(value.p);
aoqi@0:     }
aoqi@0:     case Location::invalid:
aoqi@0:       return new StackValue();
aoqi@0:     default:
aoqi@0:       ShouldNotReachHere();
aoqi@0:     }
aoqi@0: 
aoqi@0:   } else if (sv->is_constant_int()) {
aoqi@0:     // Constant int: treat same as register int.
aoqi@0:     union { intptr_t p; jint ji;} value;
aoqi@0:     value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
aoqi@0:     value.ji = (jint)((ConstantIntValue*)sv)->value();
aoqi@0:     return new StackValue(value.p);
aoqi@0:   } else if (sv->is_constant_oop()) {
aoqi@0:     // constant oop
aoqi@0:     return new StackValue(sv->as_ConstantOopReadValue()->value());
aoqi@0: #ifdef _LP64
aoqi@0:   } else if (sv->is_constant_double()) {
aoqi@0:     // Constant double in a single stack slot
aoqi@0:     union { intptr_t p; double d; } value;
aoqi@0:     value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
aoqi@0:     value.d = ((ConstantDoubleValue *)sv)->value();
aoqi@0:     return new StackValue(value.p);
aoqi@0:   } else if (sv->is_constant_long()) {
aoqi@0:     // Constant long in a single stack slot
aoqi@0:     union { intptr_t p; jlong jl; } value;
aoqi@0:     value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
aoqi@0:     value.jl = ((ConstantLongValue *)sv)->value();
aoqi@0:     return new StackValue(value.p);
aoqi@0: #endif
aoqi@0:   } else if (sv->is_object()) { // Scalar replaced object in compiled frame
aoqi@0:     Handle ov = ((ObjectValue *)sv)->value();
aoqi@0:     return new StackValue(ov, (ov.is_null()) ? 1 : 0);
aoqi@0:   }
aoqi@0: 
aoqi@0:   // Unknown ScopeValue type
aoqi@0:   ShouldNotReachHere();
aoqi@0:   return new StackValue((intptr_t) 0);   // dummy
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: BasicLock* StackValue::resolve_monitor_lock(const frame* fr, Location location) {
aoqi@0:   assert(location.is_stack(), "for now we only look at the stack");
aoqi@0:   int word_offset = location.stack_offset() / wordSize;
aoqi@0:   // (stack picture)
aoqi@0:   // high: [     ]  word_offset + 1
aoqi@0:   // low   [     ]  word_offset
aoqi@0:   //
aoqi@0:   // sp->  [     ]  0
aoqi@0:   // the word_offset is the distance from the stack pointer to the lowest address
aoqi@0:   // The frame's original stack pointer, before any extension by its callee
aoqi@0:   // (due to Compiler1 linkage on SPARC), must be used.
aoqi@0:   return (BasicLock*) (fr->unextended_sp() + word_offset);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: #ifndef PRODUCT
aoqi@0: 
aoqi@0: void StackValue::print_on(outputStream* st) const {
aoqi@0:   switch(_type) {
aoqi@0:     case T_INT:
aoqi@0:       st->print("%d (int) %f (float) %x (hex)",  *(int *)&_i, *(float *)&_i,  *(int *)&_i);
aoqi@0:       break;
aoqi@0: 
aoqi@0:     case T_OBJECT:
aoqi@0:      _o()->print_value_on(st);
aoqi@0:       st->print(" <" INTPTR_FORMAT ">", p2i((address)_o()));
aoqi@0:      break;
aoqi@0: 
aoqi@0:     case T_CONFLICT:
aoqi@0:      st->print("conflict");
aoqi@0:      break;
aoqi@0: 
aoqi@0:     default:
aoqi@0:      ShouldNotReachHere();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: #endif