Mercurial > hg > graal-jvmci-8
view src/share/vm/runtime/stackValue.cpp @ 94:0834225a7916
6634032: CMS: Need CMSInitiatingPermOccupancyFraction for perm, divorcing from CMSInitiatingOccupancyFraction
Summary: The option CMSInitiatingPermOccupancyFraction now controls perm triggering threshold. Even though the actual value of the threshold has not yet been changed, so there is no change in policy, we now have the infrastructure in place for dynamically deciding when to collect the perm gen, an issue that will be addressed in the near future.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Sun, 16 Mar 2008 21:57:25 -0700 |
parents | a61af66fc99e |
children | cecd8eb4e0ca |
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/* * Copyright 1997-2006 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. * */ # include "incls/_precompiled.incl" # include "incls/_stackValue.cpp.incl" 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); #endif case Location::oop: { Handle h(*(oop *)value_addr); // 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(((ConstantOopReadValue *)sv)->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()) { return new StackValue(((ObjectValue *)sv)->value()); } // 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 ">", (address)_o()); break; case T_CONFLICT: st->print("conflict"); break; default: ShouldNotReachHere(); } } #endif