| /* |
| * Copyright (c) 1997, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "code/debugInfo.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/frame.inline.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/stackValue.hpp" |
| |
| StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv) { |
| if (sv->is_location()) { |
| // Stack or register value |
| Location loc = ((LocationValue *)sv)->location(); |
| |
| #ifdef SPARC |
| // %%%%% Callee-save floats will NOT be working on a Sparc until we |
| // handle the case of a 2 floats in a single double register. |
| assert( !(loc.is_register() && loc.type() == Location::float_in_dbl), "Sparc does not handle callee-save floats yet" ); |
| #endif // SPARC |
| |
| // First find address of value |
| |
| address value_addr = loc.is_register() |
| // Value was in a callee-save register |
| ? reg_map->location(VMRegImpl::as_VMReg(loc.register_number())) |
| // Else value was directly saved on the stack. The frame's original stack pointer, |
| // before any extension by its callee (due to Compiler1 linkage on SPARC), must be used. |
| : ((address)fr->unextended_sp()) + loc.stack_offset(); |
| |
| // Then package it right depending on type |
| // Note: the transfer of the data is thru a union that contains |
| // an intptr_t. This is because an interpreter stack slot is |
| // really an intptr_t. The use of a union containing an intptr_t |
| // ensures that on a 64 bit platform we have proper alignment |
| // and that we store the value where the interpreter will expect |
| // to find it (i.e. proper endian). Similarly on a 32bit platform |
| // using the intptr_t ensures that when a value is larger than |
| // a stack slot (jlong/jdouble) that we capture the proper part |
| // of the value for the stack slot in question. |
| // |
| switch( loc.type() ) { |
| case Location::float_in_dbl: { // Holds a float in a double register? |
| // The callee has no clue whether the register holds a float, |
| // double or is unused. He always saves a double. Here we know |
| // a double was saved, but we only want a float back. Narrow the |
| // saved double to the float that the JVM wants. |
| assert( loc.is_register(), "floats always saved to stack in 1 word" ); |
| union { intptr_t p; jfloat jf; } value; |
| value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); |
| value.jf = (jfloat) *(jdouble*) value_addr; |
| return new StackValue(value.p); // 64-bit high half is stack junk |
| } |
| case Location::int_in_long: { // Holds an int in a long register? |
| // The callee has no clue whether the register holds an int, |
| // long or is unused. He always saves a long. Here we know |
| // a long was saved, but we only want an int back. Narrow the |
| // saved long to the int that the JVM wants. |
| assert( loc.is_register(), "ints always saved to stack in 1 word" ); |
| union { intptr_t p; jint ji;} value; |
| value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); |
| value.ji = (jint) *(jlong*) value_addr; |
| return new StackValue(value.p); // 64-bit high half is stack junk |
| } |
| #ifdef _LP64 |
| case Location::dbl: |
| // Double value in an aligned adjacent pair |
| return new StackValue(*(intptr_t*)value_addr); |
| case Location::lng: |
| // Long value in an aligned adjacent pair |
| return new StackValue(*(intptr_t*)value_addr); |
| case Location::narrowoop: { |
| union { intptr_t p; narrowOop noop;} value; |
| value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); |
| if (loc.is_register()) { |
| // The callee has no clue whether the register holds an int, |
| // long or is unused. He always saves a long. Here we know |
| // a long was saved, but we only want an int back. Narrow the |
| // saved long to the int that the JVM wants. |
| value.noop = (narrowOop) *(julong*) value_addr; |
| } else { |
| value.noop = *(narrowOop*) value_addr; |
| } |
| // Decode narrowoop and wrap a handle around the oop |
| Handle h(oopDesc::decode_heap_oop(value.noop)); |
| return new StackValue(h); |
| } |
| #endif |
| case Location::oop: { |
| oop val = *(oop *)value_addr; |
| #ifdef _LP64 |
| if (Universe::is_narrow_oop_base(val)) { |
| // Compiled code may produce decoded oop = narrow_oop_base |
| // when a narrow oop implicit null check is used. |
| // The narrow_oop_base could be NULL or be the address |
| // of the page below heap. Use NULL value for both cases. |
| val = (oop)NULL; |
| } |
| #endif |
| Handle h(val); // Wrap a handle around the oop |
| return new StackValue(h); |
| } |
| case Location::addr: { |
| ShouldNotReachHere(); // both C1 and C2 now inline jsrs |
| } |
| case Location::normal: { |
| // Just copy all other bits straight through |
| union { intptr_t p; jint ji;} value; |
| value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); |
| value.ji = *(jint*)value_addr; |
| return new StackValue(value.p); |
| } |
| case Location::invalid: |
| return new StackValue(); |
| default: |
| ShouldNotReachHere(); |
| } |
| |
| } else if (sv->is_constant_int()) { |
| // Constant int: treat same as register int. |
| union { intptr_t p; jint ji;} value; |
| value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); |
| value.ji = (jint)((ConstantIntValue*)sv)->value(); |
| return new StackValue(value.p); |
| } else if (sv->is_constant_oop()) { |
| // constant oop |
| return new StackValue(sv->as_ConstantOopReadValue()->value()); |
| #ifdef _LP64 |
| } else if (sv->is_constant_double()) { |
| // Constant double in a single stack slot |
| union { intptr_t p; double d; } value; |
| value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); |
| value.d = ((ConstantDoubleValue *)sv)->value(); |
| return new StackValue(value.p); |
| } else if (sv->is_constant_long()) { |
| // Constant long in a single stack slot |
| union { intptr_t p; jlong jl; } value; |
| value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF); |
| value.jl = ((ConstantLongValue *)sv)->value(); |
| return new StackValue(value.p); |
| #endif |
| } else if (sv->is_object()) { // Scalar replaced object in compiled frame |
| Handle ov = ((ObjectValue *)sv)->value(); |
| return new StackValue(ov, (ov.is_null()) ? 1 : 0); |
| } |
| |
| // Unknown ScopeValue type |
| ShouldNotReachHere(); |
| return new StackValue((intptr_t) 0); // dummy |
| } |
| |
| |
| BasicLock* StackValue::resolve_monitor_lock(const frame* fr, Location location) { |
| assert(location.is_stack(), "for now we only look at the stack"); |
| int word_offset = location.stack_offset() / wordSize; |
| // (stack picture) |
| // high: [ ] word_offset + 1 |
| // low [ ] word_offset |
| // |
| // sp-> [ ] 0 |
| // the word_offset is the distance from the stack pointer to the lowest address |
| // The frame's original stack pointer, before any extension by its callee |
| // (due to Compiler1 linkage on SPARC), must be used. |
| return (BasicLock*) (fr->unextended_sp() + word_offset); |
| } |
| |
| |
| #ifndef PRODUCT |
| |
| void StackValue::print_on(outputStream* st) const { |
| switch(_type) { |
| case T_INT: |
| st->print("%d (int) %f (float) %x (hex)", *(int *)&_i, *(float *)&_i, *(int *)&_i); |
| break; |
| |
| case T_OBJECT: |
| _o()->print_value_on(st); |
| st->print(" <" INTPTR_FORMAT ">", p2i((address)_o())); |
| break; |
| |
| case T_CONFLICT: |
| st->print("conflict"); |
| break; |
| |
| default: |
| ShouldNotReachHere(); |
| } |
| } |
| |
| #endif |
