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/*
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* Copyright 2003-2005 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/_psVirtualspace.cpp.incl"
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// PSVirtualSpace
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PSVirtualSpace::PSVirtualSpace(ReservedSpace rs, size_t alignment) :
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_alignment(alignment)
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{
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set_reserved(rs);
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set_committed(reserved_low_addr(), reserved_low_addr());
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DEBUG_ONLY(verify());
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}
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PSVirtualSpace::PSVirtualSpace(ReservedSpace rs) :
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_alignment(os::vm_page_size())
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{
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set_reserved(rs);
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set_committed(reserved_low_addr(), reserved_low_addr());
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DEBUG_ONLY(verify());
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}
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// Deprecated.
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PSVirtualSpace::PSVirtualSpace(): _alignment(os::vm_page_size()) {
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}
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// Deprecated.
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bool PSVirtualSpace::initialize(ReservedSpace rs,
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size_t commit_size) {
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set_reserved(rs);
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set_committed(reserved_low_addr(), reserved_low_addr());
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// Commit to initial size.
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assert(commit_size <= rs.size(), "commit_size too big");
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bool result = commit_size > 0 ? expand_by(commit_size) : true;
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DEBUG_ONLY(verify());
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return result;
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}
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PSVirtualSpace::~PSVirtualSpace() {
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release();
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}
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bool PSVirtualSpace::contains(void* p) const {
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char* const cp = (char*)p;
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return cp >= committed_low_addr() && cp < committed_high_addr();
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}
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void PSVirtualSpace::release() {
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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if (reserved_low_addr() != NULL) {
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if (special()) {
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os::release_memory_special(reserved_low_addr(), reserved_size());
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} else {
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(void)os::release_memory(reserved_low_addr(), reserved_size());
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}
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}
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_reserved_low_addr = _reserved_high_addr = NULL;
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_committed_low_addr = _committed_high_addr = NULL;
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_special = false;
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}
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bool PSVirtualSpace::expand_by(size_t bytes, bool pre_touch) {
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assert(is_aligned(bytes), "arg not aligned");
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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if (uncommitted_size() < bytes) {
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return false;
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}
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char* const base_addr = committed_high_addr();
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bool result = special() || os::commit_memory(base_addr, bytes, alignment());
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if (result) {
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_committed_high_addr += bytes;
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}
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if (pre_touch || AlwaysPreTouch) {
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for (char* curr = base_addr;
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curr < _committed_high_addr;
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curr += os::vm_page_size()) {
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char tmp = *curr;
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*curr = 0;
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}
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}
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return result;
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}
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bool PSVirtualSpace::shrink_by(size_t bytes) {
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assert(is_aligned(bytes), "arg not aligned");
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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if (committed_size() < bytes) {
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return false;
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}
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char* const base_addr = committed_high_addr() - bytes;
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bool result = special() || os::uncommit_memory(base_addr, bytes);
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if (result) {
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_committed_high_addr -= bytes;
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}
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return result;
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}
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size_t
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PSVirtualSpace::expand_into(PSVirtualSpace* other_space, size_t bytes) {
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assert(is_aligned(bytes), "arg not aligned");
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assert(grows_up(), "this space must grow up");
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assert(other_space->grows_down(), "other space must grow down");
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assert(reserved_high_addr() == other_space->reserved_low_addr(),
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"spaces not contiguous");
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assert(special() == other_space->special(), "one space is special, the other is not");
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space));
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size_t bytes_needed = bytes;
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// First use the uncommitted region in this space.
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size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed);
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if (tmp_bytes > 0) {
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if (expand_by(tmp_bytes)) {
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bytes_needed -= tmp_bytes;
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} else {
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return 0;
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}
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}
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// Next take from the uncommitted region in the other space, and commit it.
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tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed);
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if (tmp_bytes > 0) {
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char* const commit_base = committed_high_addr();
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if (other_space->special() ||
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os::commit_memory(commit_base, tmp_bytes, alignment())) {
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// Reduce the reserved region in the other space.
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other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes,
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other_space->reserved_high_addr(),
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other_space->special());
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// Grow both reserved and committed in this space.
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_reserved_high_addr += tmp_bytes;
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_committed_high_addr += tmp_bytes;
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bytes_needed -= tmp_bytes;
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} else {
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return bytes - bytes_needed;
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}
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}
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// Finally take from the already committed region in the other space.
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tmp_bytes = bytes_needed;
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if (tmp_bytes > 0) {
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// Reduce both committed and reserved in the other space.
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other_space->set_committed(other_space->committed_low_addr() + tmp_bytes,
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other_space->committed_high_addr());
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other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes,
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other_space->reserved_high_addr(),
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other_space->special());
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// Grow both reserved and committed in this space.
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_reserved_high_addr += tmp_bytes;
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_committed_high_addr += tmp_bytes;
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}
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return bytes;
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}
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#ifndef PRODUCT
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bool PSVirtualSpace::is_aligned(size_t value, size_t align) {
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const size_t tmp_value = value + align - 1;
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const size_t mask = ~(align - 1);
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return (tmp_value & mask) == value;
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}
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bool PSVirtualSpace::is_aligned(size_t value) const {
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return is_aligned(value, alignment());
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}
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bool PSVirtualSpace::is_aligned(char* value) const {
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return is_aligned((size_t)value);
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}
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void PSVirtualSpace::verify() const {
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assert(is_aligned(alignment(), os::vm_page_size()), "bad alignment");
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assert(is_aligned(reserved_low_addr()), "bad reserved_low_addr");
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assert(is_aligned(reserved_high_addr()), "bad reserved_high_addr");
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assert(is_aligned(committed_low_addr()), "bad committed_low_addr");
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assert(is_aligned(committed_high_addr()), "bad committed_high_addr");
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// Reserved region must be non-empty or both addrs must be 0.
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assert(reserved_low_addr() < reserved_high_addr() ||
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reserved_low_addr() == NULL && reserved_high_addr() == NULL,
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"bad reserved addrs");
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assert(committed_low_addr() <= committed_high_addr(), "bad committed addrs");
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if (grows_up()) {
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assert(reserved_low_addr() == committed_low_addr(), "bad low addrs");
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assert(reserved_high_addr() >= committed_high_addr(), "bad high addrs");
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} else {
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assert(reserved_high_addr() == committed_high_addr(), "bad high addrs");
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assert(reserved_low_addr() <= committed_low_addr(), "bad low addrs");
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}
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}
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void PSVirtualSpace::print() const {
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gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment="
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SIZE_FORMAT "K grows %s%s",
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this, alignment() / K, grows_up() ? "up" : "down",
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special() ? " (pinned in memory)" : "");
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gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K"
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" [" PTR_FORMAT "," PTR_FORMAT "]"
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" committed=" SIZE_FORMAT "K"
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" [" PTR_FORMAT "," PTR_FORMAT "]",
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reserved_size() / K,
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reserved_low_addr(), reserved_high_addr(),
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committed_size() / K,
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committed_low_addr(), committed_high_addr());
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}
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#endif // #ifndef PRODUCT
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void PSVirtualSpace::print_space_boundaries_on(outputStream* st) const {
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st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")",
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low_boundary(), high(), high_boundary());
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}
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PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs,
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size_t alignment) :
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PSVirtualSpace(alignment)
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{
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set_reserved(rs);
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set_committed(reserved_high_addr(), reserved_high_addr());
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DEBUG_ONLY(verify());
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}
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PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs) {
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set_reserved(rs);
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set_committed(reserved_high_addr(), reserved_high_addr());
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DEBUG_ONLY(verify());
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}
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bool PSVirtualSpaceHighToLow::expand_by(size_t bytes, bool pre_touch) {
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assert(is_aligned(bytes), "arg not aligned");
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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if (uncommitted_size() < bytes) {
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return false;
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}
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char* const base_addr = committed_low_addr() - bytes;
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bool result = special() || os::commit_memory(base_addr, bytes, alignment());
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if (result) {
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_committed_low_addr -= bytes;
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}
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if (pre_touch || AlwaysPreTouch) {
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for (char* curr = base_addr;
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curr < _committed_high_addr;
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curr += os::vm_page_size()) {
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char tmp = *curr;
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*curr = 0;
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}
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}
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return result;
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}
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bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) {
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assert(is_aligned(bytes), "arg not aligned");
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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if (committed_size() < bytes) {
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return false;
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}
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char* const base_addr = committed_low_addr();
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bool result = special() || os::uncommit_memory(base_addr, bytes);
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if (result) {
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_committed_low_addr += bytes;
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}
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return result;
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}
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size_t PSVirtualSpaceHighToLow::expand_into(PSVirtualSpace* other_space,
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size_t bytes) {
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assert(is_aligned(bytes), "arg not aligned");
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assert(grows_down(), "this space must grow down");
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assert(other_space->grows_up(), "other space must grow up");
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assert(reserved_low_addr() == other_space->reserved_high_addr(),
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"spaces not contiguous");
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assert(special() == other_space->special(), "one space is special in memory, the other is not");
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DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space));
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size_t bytes_needed = bytes;
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// First use the uncommitted region in this space.
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size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed);
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if (tmp_bytes > 0) {
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if (expand_by(tmp_bytes)) {
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bytes_needed -= tmp_bytes;
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} else {
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return 0;
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}
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}
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// Next take from the uncommitted region in the other space, and commit it.
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tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed);
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if (tmp_bytes > 0) {
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char* const commit_base = committed_low_addr() - tmp_bytes;
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if (other_space->special() ||
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os::commit_memory(commit_base, tmp_bytes, alignment())) {
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// Reduce the reserved region in the other space.
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other_space->set_reserved(other_space->reserved_low_addr(),
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other_space->reserved_high_addr() - tmp_bytes,
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other_space->special());
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// Grow both reserved and committed in this space.
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_reserved_low_addr -= tmp_bytes;
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_committed_low_addr -= tmp_bytes;
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bytes_needed -= tmp_bytes;
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} else {
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return bytes - bytes_needed;
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}
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}
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// Finally take from the already committed region in the other space.
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tmp_bytes = bytes_needed;
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if (tmp_bytes > 0) {
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// Reduce both committed and reserved in the other space.
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other_space->set_committed(other_space->committed_low_addr(),
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other_space->committed_high_addr() - tmp_bytes);
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other_space->set_reserved(other_space->reserved_low_addr(),
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other_space->reserved_high_addr() - tmp_bytes,
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other_space->special());
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// Grow both reserved and committed in this space.
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_reserved_low_addr -= tmp_bytes;
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_committed_low_addr -= tmp_bytes;
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}
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return bytes;
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}
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void
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PSVirtualSpaceHighToLow::print_space_boundaries_on(outputStream* st) const {
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st->print_cr(" (" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT "]",
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high_boundary(), low(), low_boundary());
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}
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