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* Copyright (c) 1998, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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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* 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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* 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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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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#include "precompiled.hpp"
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#include "code/codeBlob.hpp"
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#include "code/codeCache.hpp"
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#include "code/nmethod.hpp"
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#include "code/scopeDesc.hpp"
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#include "compiler/oopMap.inline.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "logging/log.hpp"
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#include "logging/logStream.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/iterator.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/compressedOops.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/signature.hpp"
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#include "runtime/stackWatermarkSet.inline.hpp"
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#include "utilities/align.hpp"
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#include "utilities/lockFreeStack.hpp"
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#include "c1/c1_Defs.hpp"
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#include "opto/optoreg.hpp"
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#include "jvmci/jvmci_globals.hpp"
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static_assert(sizeof(oop) == sizeof(intptr_t), "Derived pointer sanity check");
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static inline intptr_t derived_pointer_value(derived_pointer p) {
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return static_cast<intptr_t>(p);
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static inline derived_pointer to_derived_pointer(intptr_t obj) {
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return static_cast<derived_pointer>(obj);
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static inline intptr_t operator-(derived_pointer p, derived_pointer p1) {
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return derived_pointer_value(p) - derived_pointer_value(p1);
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static inline derived_pointer operator+(derived_pointer p, intptr_t offset) {
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return static_cast<derived_pointer>(derived_pointer_value(p) + offset);
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OopMapStream::OopMapStream(const OopMap* oop_map)
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: _stream(oop_map->write_stream()->buffer()) {
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_size = oop_map->omv_count();
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OopMapStream::OopMapStream(const ImmutableOopMap* oop_map)
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: _stream(oop_map->data_addr()) {
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_size = oop_map->count();
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void OopMapStream::find_next() {
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if (_position++ < _size) {
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_omv.read_from(&_stream);
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// frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd
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// slots to hold 4-byte values like ints and floats in the LP64 build.
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OopMap::OopMap(int frame_size, int arg_count) {
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// OopMaps are usually quite so small, so pick a small initial size
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set_write_stream(new CompressedWriteStream(32));
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_has_derived_oops = false;
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_locs_length = VMRegImpl::stack2reg(0)->value() + frame_size + arg_count;
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_locs_used = NEW_RESOURCE_ARRAY(OopMapValue::oop_types, _locs_length);
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for(int i = 0; i < _locs_length; i++) _locs_used[i] = OopMapValue::unused_value;
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OopMap::OopMap(OopMap::DeepCopyToken, OopMap* source) {
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// This constructor does a deep copy
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// of the source OopMap.
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set_write_stream(new CompressedWriteStream(source->omv_count() * 2));
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set_offset(source->offset());
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_num_oops = source->num_oops();
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_has_derived_oops = source->has_derived_oops();
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_locs_length = source->_locs_length;
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_locs_used = NEW_RESOURCE_ARRAY(OopMapValue::oop_types, _locs_length);
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for(int i = 0; i < _locs_length; i++) _locs_used[i] = OopMapValue::unused_value;
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// We need to copy the entries too.
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for (OopMapStream oms(source); !oms.is_done(); oms.next()) {
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OopMapValue omv = oms.current();
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omv.write_on(write_stream());
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OopMap* OopMap::deep_copy() {
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return new OopMap(_deep_copy_token, this);
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void OopMap::copy_data_to(address addr) const {
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memcpy(addr, write_stream()->buffer(), write_stream()->position());
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OopMapValue* _values;
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OopMapSort(const OopMap* map) : _map(map), _count(0) {
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_values = NEW_RESOURCE_ARRAY(OopMapValue, _map->omv_count());
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void write(CompressedWriteStream* stream) {
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for (int i = 0; i < _count; ++i) {
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_values[i].write_on(stream);
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int find_derived_position(OopMapValue omv, int start) {
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assert(omv.type() == OopMapValue::derived_oop_value, "");
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VMReg base = omv.content_reg();
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for (; i < _count; ++i) {
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if (base == _values[i].reg()) {
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for (int n = i + 1; n < _count; ++n) {
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if (_values[i].type() != OopMapValue::derived_oop_value || _values[i].content_reg() != base) {
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if (derived_cost(_values[i]) > derived_cost(omv)) {
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assert(false, "failed to find base");
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int find_position(OopMapValue omv, int start) {
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assert(omv.type() != OopMapValue::derived_oop_value, "");
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for (; i < _count; ++i) {
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if (omv_cost(_values[i]) > omv_cost(omv)) {
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assert(i < _map->omv_count(), "bounds check");
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void insert(OopMapValue value, int pos) {
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assert(pos >= 0 && pos < _map->omv_count(), "bounds check");
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assert(pos <= _count, "sanity");
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OopMapValue prev = _values[pos];
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for (int i = pos; i < _count; ++i) {
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OopMapValue tmp = _values[i+1];
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_values[pos] = value;
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int omv_cost(OopMapValue omv) {
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assert(omv.type() == OopMapValue::oop_value || omv.type() == OopMapValue::narrowoop_value, "");
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return reg_cost(omv.reg());
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int reg_cost(VMReg reg) {
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return reg->reg2stack() * VMRegImpl::stack_slot_size;
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int derived_cost(OopMapValue omv) {
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return reg_cost(omv.reg());
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void OopMapSort::sort() {
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for (OopMapStream oms(_map); !oms.is_done(); oms.next()) {
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OopMapValue omv = oms.current();
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assert(omv.type() == OopMapValue::oop_value || omv.type() == OopMapValue::narrowoop_value || omv.type() == OopMapValue::derived_oop_value || omv.type() == OopMapValue::callee_saved_value, "");
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for (OopMapStream oms(_map); !oms.is_done(); oms.next()) {
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if (oms.current().type() == OopMapValue::callee_saved_value) {
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insert(oms.current(), _count);
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for (OopMapStream oms(_map); !oms.is_done(); oms.next()) {
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OopMapValue omv = oms.current();
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if (omv.type() == OopMapValue::oop_value || omv.type() == OopMapValue::narrowoop_value) {
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int pos = find_position(omv, start);
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for (OopMapStream oms(_map); !oms.is_done(); oms.next()) {
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OopMapValue omv = oms.current();
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if (omv.type() == OopMapValue::derived_oop_value) {
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int pos = find_derived_position(omv, start);
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void OopMapSort::print() {
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for (int i = 0; i < _count; ++i) {
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OopMapValue omv = _values[i];
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if (omv.type() == OopMapValue::oop_value || omv.type() == OopMapValue::narrowoop_value) {
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if (omv.reg()->is_reg()) {
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tty->print_cr("[%c][%d] -> reg (%d)", omv.type() == OopMapValue::narrowoop_value ? 'n' : 'o', i, omv.reg()->value());
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tty->print_cr("[%c][%d] -> stack (%d)", omv.type() == OopMapValue::narrowoop_value ? 'n' : 'o', i, omv.reg()->reg2stack() * VMRegImpl::stack_slot_size);
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if (omv.content_reg()->is_reg()) {
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tty->print_cr("[d][%d] -> reg (%d) stack (%d)", i, omv.content_reg()->value(), omv.reg()->reg2stack() * VMRegImpl::stack_slot_size);
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} else if (omv.reg()->is_reg()) {
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tty->print_cr("[d][%d] -> stack (%d) reg (%d)", i, omv.content_reg()->reg2stack() * VMRegImpl::stack_slot_size, omv.reg()->value());
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int derived_offset = omv.reg()->reg2stack() * VMRegImpl::stack_slot_size;
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int base_offset = omv.content_reg()->reg2stack() * VMRegImpl::stack_slot_size;
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tty->print_cr("[d][%d] -> stack (%x) stack (%x)", i, base_offset, derived_offset);
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void OopMap::copy_and_sort_data_to(address addr) const {
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OopMapSort sort(this);
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CompressedWriteStream* stream = new CompressedWriteStream(_write_stream->position());
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assert(stream->position() == write_stream()->position(), "");
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memcpy(addr, stream->buffer(), stream->position());
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int OopMap::heap_size() const {
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int size = sizeof(OopMap);
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int align = sizeof(void *) - 1;
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size += write_stream()->position();
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// Align to a reasonable ending point
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size = ((size+align) & ~align);
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// frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd
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// slots to hold 4-byte values like ints and floats in the LP64 build.
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void OopMap::set_xxx(VMReg reg, OopMapValue::oop_types x, VMReg optional) {
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assert(reg->value() < _locs_length, "too big reg value for stack size");
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assert( _locs_used[reg->value()] == OopMapValue::unused_value, "cannot insert twice" );
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debug_only( _locs_used[reg->value()] = x; )
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OopMapValue o(reg, x, optional);
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o.write_on(write_stream());
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if (x == OopMapValue::oop_value || x == OopMapValue::narrowoop_value) {
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increment_num_oops();
334
} else if (x == OopMapValue::derived_oop_value) {
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set_has_derived_oops(true);
340
void OopMap::set_oop(VMReg reg) {
341
set_xxx(reg, OopMapValue::oop_value, VMRegImpl::Bad());
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void OopMap::set_narrowoop(VMReg reg) {
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set_xxx(reg, OopMapValue::narrowoop_value, VMRegImpl::Bad());
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void OopMap::set_callee_saved(VMReg reg, VMReg caller_machine_register ) {
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set_xxx(reg, OopMapValue::callee_saved_value, caller_machine_register);
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void OopMap::set_derived_oop(VMReg reg, VMReg derived_from_local_register ) {
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if( reg == derived_from_local_register ) {
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// Actually an oop, derived shares storage with base,
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set_xxx(reg, OopMapValue::derived_oop_value, derived_from_local_register);
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OopMapSet::OopMapSet() : _list(MinOopMapAllocation) {}
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int OopMapSet::add_gc_map(int pc_offset, OopMap *map ) {
369
map->set_offset(pc_offset);
372
if(_list.length() > 0) {
373
OopMap* last = _list.last();
374
if (last->offset() == map->offset() ) {
375
fatal("OopMap inserted twice");
377
if (last->offset() > map->offset()) {
378
tty->print_cr( "WARNING, maps not sorted: pc[%d]=%d, pc[%d]=%d",
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_list.length(),last->offset(),_list.length()+1,map->offset());
384
int index = add(map);
389
class AddDerivedOop : public DerivedOopClosure {
392
SkipNull = true, NeedsLock = true
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virtual void do_derived_oop(derived_base* base, derived_pointer* derived) {
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#if COMPILER2_OR_JVMCI
397
DerivedPointerTable::add(derived, base);
398
#endif // COMPILER2_OR_JVMCI
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class ProcessDerivedOop : public DerivedOopClosure {
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ProcessDerivedOop(OopClosure* oop_cl) :
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SkipNull = true, NeedsLock = true
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virtual void do_derived_oop(derived_base* base, derived_pointer* derived) {
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// All derived pointers must be processed before the base pointer of any derived pointer is processed.
415
// Otherwise, if two derived pointers use the same base, the second derived pointer will get an obscured
416
// offset, if the base pointer is processed in the first derived pointer.
417
derived_pointer derived_base = to_derived_pointer(*reinterpret_cast<intptr_t*>(base));
418
intptr_t offset = *derived - derived_base;
419
*derived = derived_base;
420
_oop_cl->do_oop((oop*)derived);
421
*derived = *derived + offset;
425
class IgnoreDerivedOop : public DerivedOopClosure {
430
SkipNull = true, NeedsLock = true
433
virtual void do_derived_oop(derived_base* base, derived_pointer* derived) {}
436
void OopMapSet::oops_do(const frame* fr, const RegisterMap* reg_map, OopClosure* f, DerivedPointerIterationMode mode) {
437
find_map(fr)->oops_do(fr, reg_map, f, mode);
440
void OopMapSet::oops_do(const frame *fr, const RegisterMap* reg_map, OopClosure* f, DerivedOopClosure* df) {
441
find_map(fr)->oops_do(fr, reg_map, f, df);
444
void ImmutableOopMap::oops_do(const frame *fr, const RegisterMap *reg_map,
445
OopClosure* oop_fn, DerivedOopClosure* derived_oop_fn) const {
446
assert(derived_oop_fn != nullptr, "sanity");
447
OopMapDo<OopClosure, DerivedOopClosure, SkipNullValue> visitor(oop_fn, derived_oop_fn);
448
visitor.oops_do(fr, reg_map, this);
451
void ImmutableOopMap::oops_do(const frame *fr, const RegisterMap *reg_map,
452
OopClosure* oop_fn, DerivedPointerIterationMode derived_mode) const {
453
ProcessDerivedOop process_cl(oop_fn);
454
AddDerivedOop add_cl;
455
IgnoreDerivedOop ignore_cl;
456
DerivedOopClosure* derived_cl;
457
switch (derived_mode) {
458
case DerivedPointerIterationMode::_directly:
459
derived_cl = &process_cl;
461
case DerivedPointerIterationMode::_with_table:
462
derived_cl = &add_cl;
464
case DerivedPointerIterationMode::_ignore:
465
derived_cl = &ignore_cl;
468
guarantee (false, "unreachable");
470
OopMapDo<OopClosure, DerivedOopClosure, SkipNullValue> visitor(oop_fn, derived_cl);
471
visitor.oops_do(fr, reg_map, this);
474
void ImmutableOopMap::all_type_do(const frame *fr, OopMapClosure* fn) const {
476
for (OopMapStream oms(this); !oms.is_done(); oms.next()) {
478
if (fn->handle_type(omv.type())) {
479
fn->do_value(omv.reg(), omv.type());
484
void ImmutableOopMap::all_type_do(const frame *fr, OopMapValue::oop_types type, OopMapClosure* fn) const {
486
for (OopMapStream oms(this); !oms.is_done(); oms.next()) {
488
if (omv.type() == type) {
489
fn->do_value(omv.reg(), omv.type());
494
static void update_register_map1(const ImmutableOopMap* oopmap, const frame* fr, RegisterMap* reg_map) {
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for (OopMapStream oms(oopmap); !oms.is_done(); oms.next()) {
496
OopMapValue omv = oms.current();
497
if (omv.type() == OopMapValue::callee_saved_value) {
498
VMReg reg = omv.content_reg();
499
address loc = fr->oopmapreg_to_location(omv.reg(), reg_map);
500
reg_map->set_location(reg, loc);
505
// Update callee-saved register info for the following frame
506
void ImmutableOopMap::update_register_map(const frame *fr, RegisterMap *reg_map) const {
507
CodeBlob* cb = fr->cb();
508
assert(cb != nullptr, "no codeblob");
509
// Any reg might be saved by a safepoint handler (see generate_handler_blob).
510
assert( reg_map->_update_for_id == nullptr || fr->is_older(reg_map->_update_for_id),
511
"already updated this map; do not 'update' it twice!" );
512
debug_only(reg_map->_update_for_id = fr->id());
514
// Check if caller must update oop argument
515
assert((reg_map->include_argument_oops() ||
516
!cb->caller_must_gc_arguments(reg_map->thread())),
517
"include_argument_oops should already be set");
519
// Scan through oopmap and find location of all callee-saved registers
520
// (we do not do update in place, since info could be overwritten)
522
update_register_map1(this, fr, reg_map);
525
const ImmutableOopMap* OopMapSet::find_map(const frame *fr) {
526
return find_map(fr->cb(), fr->pc());
529
const ImmutableOopMap* OopMapSet::find_map(const CodeBlob* cb, address pc) {
530
assert(cb != nullptr, "no codeblob");
531
const ImmutableOopMap* map = cb->oop_map_for_return_address(pc);
532
assert(map != nullptr, "no ptr map found");
536
// Update callee-saved register info for the following frame
537
void OopMapSet::update_register_map(const frame *fr, RegisterMap *reg_map) {
538
find_map(fr)->update_register_map(fr, reg_map);
541
//=============================================================================
545
void OopMapSet::trace_codeblob_maps(const frame *fr, const RegisterMap *reg_map) {
546
// Print oopmap and regmap
547
tty->print_cr("------ ");
548
CodeBlob* cb = fr->cb();
549
const ImmutableOopMapSet* maps = cb->oop_maps();
550
const ImmutableOopMap* map = cb->oop_map_for_return_address(fr->pc());
552
if( cb->is_nmethod() ) {
553
nmethod* nm = (nmethod*)cb;
554
// native wrappers have no scope data, it is implied
555
if (nm->is_native_method()) {
556
tty->print("bci: 0 (native)");
558
ScopeDesc* scope = nm->scope_desc_at(fr->pc());
559
tty->print("bci: %d ",scope->bci());
565
cb->print_value_on(tty); tty->cr();
566
if (reg_map != nullptr) {
569
tty->print_cr("------ ");
574
// Printing code is present in product build for -XX:+PrintAssembly.
577
void print_register_type(OopMapValue::oop_types x, VMReg optional,
580
case OopMapValue::oop_value:
583
case OopMapValue::narrowoop_value:
584
st->print("NarrowOop");
586
case OopMapValue::callee_saved_value:
587
st->print("Callers_");
588
optional->print_on(st);
590
case OopMapValue::derived_oop_value:
591
st->print("Derived_oop_");
592
optional->print_on(st);
595
ShouldNotReachHere();
599
void OopMapValue::print_on(outputStream* st) const {
602
print_register_type(type(),content_reg(),st);
606
void OopMapValue::print() const { print_on(tty); }
608
void ImmutableOopMap::print_on(outputStream* st) const {
610
st->print("ImmutableOopMap {");
611
for(OopMapStream oms(this); !oms.is_done(); oms.next()) {
618
void ImmutableOopMap::print() const { print_on(tty); }
620
void OopMap::print_on(outputStream* st) const {
622
st->print("OopMap {");
623
for(OopMapStream oms((OopMap*)this); !oms.is_done(); oms.next()) {
627
// Print hex offset in addition.
628
st->print("off=%d/0x%x}", (int) offset(), (int) offset());
631
void OopMap::print() const { print_on(tty); }
633
void ImmutableOopMapSet::print_on(outputStream* st) const {
634
const ImmutableOopMap* last = nullptr;
635
const int len = count();
637
st->print_cr("ImmutableOopMapSet contains %d OopMaps", len);
639
for (int i = 0; i < len; i++) {
640
const ImmutableOopMapPair* pair = pair_at(i);
641
const ImmutableOopMap* map = pair->get_from(this);
645
st->print(" pc offsets: ");
648
st->print("%d ", pair->pc_offset());
653
void ImmutableOopMapSet::print() const { print_on(tty); }
655
void OopMapSet::print_on(outputStream* st) const {
656
const int len = _list.length();
658
st->print_cr("OopMapSet contains %d OopMaps", len);
660
for( int i = 0; i < len; i++) {
662
st->print_cr("#%d ",i);
669
void OopMapSet::print() const { print_on(tty); }
671
bool OopMap::equals(const OopMap* other) const {
672
if (other->_omv_count != _omv_count) {
675
if (other->write_stream()->position() != write_stream()->position()) {
678
if (memcmp(other->write_stream()->buffer(), write_stream()->buffer(), write_stream()->position()) != 0) {
684
int ImmutableOopMapSet::find_slot_for_offset(int pc_offset) const {
685
// we might not have an oopmap at asynchronous (non-safepoint) stackwalks
686
ImmutableOopMapPair* pairs = get_pairs();
687
for (int i = 0; i < _count; ++i) {
688
if (pairs[i].pc_offset() >= pc_offset) {
689
ImmutableOopMapPair* last = &pairs[i];
690
return last->pc_offset() == pc_offset ? i : -1;
696
const ImmutableOopMap* ImmutableOopMapSet::find_map_at_offset(int pc_offset) const {
697
ImmutableOopMapPair* pairs = get_pairs();
698
ImmutableOopMapPair* last = nullptr;
700
for (int i = 0; i < _count; ++i) {
701
if (pairs[i].pc_offset() >= pc_offset) {
707
// Heal Coverity issue: potential index out of bounds access.
708
guarantee(last != nullptr, "last may not be null");
709
assert(last->pc_offset() == pc_offset, "oopmap not found");
710
return last->get_from(this);
713
ImmutableOopMap::ImmutableOopMap(const OopMap* oopmap)
714
: _count(oopmap->count()), _num_oops(oopmap->num_oops()) {
715
_num_oops = oopmap->num_oops();
716
_has_derived_oops = oopmap->has_derived_oops();
717
address addr = data_addr();
718
oopmap->copy_and_sort_data_to(addr);
721
bool ImmutableOopMap::has_any(OopMapValue::oop_types type) const {
722
for (OopMapStream oms(this); !oms.is_done(); oms.next()) {
723
if (oms.current().type() == type) {
731
int ImmutableOopMap::nr_of_bytes() const {
732
OopMapStream oms(this);
734
while (!oms.is_done()) {
737
return sizeof(ImmutableOopMap) + oms.stream_position();
741
ImmutableOopMapBuilder::ImmutableOopMapBuilder(const OopMapSet* set) : _set(set), _empty(nullptr), _last(nullptr), _empty_offset(-1), _last_offset(-1), _offset(0), _required(-1), _new_set(nullptr) {
742
_mapping = NEW_RESOURCE_ARRAY(Mapping, _set->size());
745
int ImmutableOopMapBuilder::size_for(const OopMap* map) const {
746
return align_up((int)sizeof(ImmutableOopMap) + map->data_size(), 8);
749
int ImmutableOopMapBuilder::heap_size() {
750
int base = sizeof(ImmutableOopMapSet);
751
base = align_up(base, 8);
753
// all of ours pc / offset pairs
754
int pairs = _set->size() * sizeof(ImmutableOopMapPair);
755
pairs = align_up(pairs, 8);
757
for (int i = 0; i < _set->size(); ++i) {
759
OopMap* map = _set->at(i);
762
/* only keep a single empty map in the set */
764
_mapping[i].set(Mapping::OOPMAP_EMPTY, _empty_offset, 0, map, _empty);
766
_empty_offset = _offset;
768
size = size_for(map);
769
_mapping[i].set(Mapping::OOPMAP_NEW, _offset, size, map);
771
} else if (is_last_duplicate(map)) {
772
/* if this entry is identical to the previous one, just point it there */
773
_mapping[i].set(Mapping::OOPMAP_DUPLICATE, _last_offset, 0, map, _last);
775
/* not empty, not an identical copy of the previous entry */
776
size = size_for(map);
777
_mapping[i].set(Mapping::OOPMAP_NEW, _offset, size, map);
778
_last_offset = _offset;
782
assert(_mapping[i]._map == map, "check");
786
int total = base + pairs + _offset;
787
DEBUG_ONLY(total += 8);
792
void ImmutableOopMapBuilder::fill_pair(ImmutableOopMapPair* pair, const OopMap* map, int offset, const ImmutableOopMapSet* set) {
793
assert(offset < set->nr_of_bytes(), "check");
794
new ((address) pair) ImmutableOopMapPair(map->offset(), offset);
797
int ImmutableOopMapBuilder::fill_map(ImmutableOopMapPair* pair, const OopMap* map, int offset, const ImmutableOopMapSet* set) {
798
fill_pair(pair, map, offset, set);
799
address addr = (address) pair->get_from(_new_set); // location of the ImmutableOopMap
801
new (addr) ImmutableOopMap(map);
802
return size_for(map);
805
void ImmutableOopMapBuilder::fill(ImmutableOopMapSet* set, int sz) {
806
ImmutableOopMapPair* pairs = set->get_pairs();
808
for (int i = 0; i < set->count(); ++i) {
809
const OopMap* map = _mapping[i]._map;
810
ImmutableOopMapPair* pair = nullptr;
813
if (_mapping[i]._kind == Mapping::OOPMAP_NEW) {
814
size = fill_map(&pairs[i], map, _mapping[i]._offset, set);
815
} else if (_mapping[i]._kind == Mapping::OOPMAP_DUPLICATE || _mapping[i]._kind == Mapping::OOPMAP_EMPTY) {
816
fill_pair(&pairs[i], map, _mapping[i]._offset, set);
819
//const ImmutableOopMap* nv = set->find_map_at_offset(map->offset());
820
//assert(memcmp(map->data(), nv->data_addr(), map->data_size()) == 0, "check identity");
825
void ImmutableOopMapBuilder::verify(address buffer, int size, const ImmutableOopMapSet* set) {
826
for (int i = 0; i < 8; ++i) {
827
assert(buffer[size - 8 + i] == (unsigned char) 0xff, "overwritten memory check");
830
for (int i = 0; i < set->count(); ++i) {
831
const ImmutableOopMapPair* pair = set->pair_at(i);
832
assert(pair->oopmap_offset() < set->nr_of_bytes(), "check size");
833
const ImmutableOopMap* map = pair->get_from(set);
834
int nr_of_bytes = map->nr_of_bytes();
835
assert(pair->oopmap_offset() + nr_of_bytes <= set->nr_of_bytes(), "check size + size");
840
ImmutableOopMapSet* ImmutableOopMapBuilder::generate_into(address buffer) {
841
DEBUG_ONLY(memset(&buffer[_required-8], 0xff, 8));
843
_new_set = new (buffer) ImmutableOopMapSet(_set, _required);
844
fill(_new_set, _required);
846
DEBUG_ONLY(verify(buffer, _required, _new_set));
851
ImmutableOopMapSet* ImmutableOopMapBuilder::build() {
852
_required = heap_size();
854
// We need to allocate a chunk big enough to hold the ImmutableOopMapSet and all of its ImmutableOopMaps
855
address buffer = NEW_C_HEAP_ARRAY(unsigned char, _required, mtCode);
856
return generate_into(buffer);
859
ImmutableOopMapSet* ImmutableOopMapSet::build_from(const OopMapSet* oopmap_set) {
861
ImmutableOopMapBuilder builder(oopmap_set);
862
return builder.build();
865
void ImmutableOopMapSet::operator delete(void* p) {
866
FREE_C_HEAP_ARRAY(unsigned char, p);
869
//------------------------------DerivedPointerTable---------------------------
871
#if COMPILER2_OR_JVMCI
873
class DerivedPointerTable::Entry : public CHeapObj<mtCompiler> {
874
derived_pointer* _location; // Location of derived pointer, also pointing to base
875
intptr_t _offset; // Offset from base pointer
876
Entry* volatile _next;
878
static Entry* volatile* next_ptr(Entry& entry) { return &entry._next; }
881
Entry(derived_pointer* location, intptr_t offset) :
882
_location(location), _offset(offset), _next(nullptr) {}
884
derived_pointer* location() const { return _location; }
885
intptr_t offset() const { return _offset; }
886
Entry* next() const { return _next; }
888
typedef LockFreeStack<Entry, &next_ptr> List;
892
DerivedPointerTable::Entry::List* DerivedPointerTable::Entry::_list = nullptr;
893
bool DerivedPointerTable::_active = false;
895
bool DerivedPointerTable::is_empty() {
896
return Entry::_list == nullptr || Entry::_list->empty();
899
void DerivedPointerTable::clear() {
900
// The first time, we create the list. Otherwise it should be
901
// empty. If not, then we have probably forgotton to call
902
// update_pointers after last GC/Scavenge.
903
assert (!_active, "should not be active");
904
assert(is_empty(), "table not empty");
905
if (Entry::_list == nullptr) {
906
void* mem = NEW_C_HEAP_OBJ(Entry::List, mtCompiler);
907
Entry::_list = ::new (mem) Entry::List();
912
void DerivedPointerTable::add(derived_pointer* derived_loc, derived_base* base_loc) {
913
assert(Universe::heap()->is_in_or_null((void*)*base_loc), "not an oop");
914
assert(derived_loc != (void*)base_loc, "Base and derived in same location");
915
derived_pointer base_loc_as_derived_pointer =
916
static_cast<derived_pointer>(reinterpret_cast<intptr_t>(base_loc));
917
assert(*derived_loc != base_loc_as_derived_pointer, "location already added");
918
assert(Entry::_list != nullptr, "list must exist");
919
assert(is_active(), "table must be active here");
920
intptr_t offset = *derived_loc - to_derived_pointer(*reinterpret_cast<intptr_t*>(base_loc));
921
// This assert is invalid because derived pointers can be
922
// arbitrarily far away from their base.
923
// assert(offset >= -1000000, "wrong derived pointer info");
925
if (TraceDerivedPointers) {
927
"Add derived pointer@" INTPTR_FORMAT
928
" - Derived: " INTPTR_FORMAT
929
" Base: " INTPTR_FORMAT " (@" INTPTR_FORMAT ") (Offset: " INTX_FORMAT ")",
930
p2i(derived_loc), derived_pointer_value(*derived_loc), intptr_t(*base_loc), p2i(base_loc), offset
933
// Set derived oop location to point to base.
934
*derived_loc = base_loc_as_derived_pointer;
935
Entry* entry = new Entry(derived_loc, offset);
936
Entry::_list->push(*entry);
939
void DerivedPointerTable::update_pointers() {
940
assert(Entry::_list != nullptr, "list must exist");
941
Entry* entries = Entry::_list->pop_all();
942
while (entries != nullptr) {
943
Entry* entry = entries;
944
entries = entry->next();
945
derived_pointer* derived_loc = entry->location();
946
intptr_t offset = entry->offset();
947
// The derived oop was setup to point to location of base
948
oop base = **reinterpret_cast<oop**>(derived_loc);
949
assert(Universe::heap()->is_in_or_null(base), "must be an oop");
951
derived_pointer derived_base = to_derived_pointer(cast_from_oop<intptr_t>(base));
952
*derived_loc = derived_base + offset;
953
assert(*derived_loc - derived_base == offset, "sanity check");
955
// assert(offset >= 0 && offset <= (intptr_t)(base->size() << LogHeapWordSize), "offset: %ld base->size: %zu relative: %d", offset, base->size() << LogHeapWordSize, *(intptr_t*)derived_loc <= 0);
957
if (TraceDerivedPointers) {
958
tty->print_cr("Updating derived pointer@" INTPTR_FORMAT
959
" - Derived: " INTPTR_FORMAT " Base: " INTPTR_FORMAT " (Offset: " INTX_FORMAT ")",
960
p2i(derived_loc), derived_pointer_value(*derived_loc), p2i(base), offset);
966
assert(Entry::_list->empty(), "invariant");
970
#endif // COMPILER2_OR_JVMCI