jdk8-mips64-public/hotspot: comparison src/share/vm/runtime/stackValue.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* 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

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/runtime/stackValue.cpp

src/share/vm/runtime/stackValue.cpp