/*
* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
* Copyright 2007, 2008, 2009, 2010 Red Hat, Inc.
* 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.
*
*/
#ifndef OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP
#define OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP
private:
ZeroStack _zero_stack;
ZeroFrame* _top_zero_frame;
void pd_initialize() {
_top_zero_frame = NULL;
}
public:
ZeroStack *zero_stack() {
return &_zero_stack;
}
public:
ZeroFrame *top_zero_frame() {
return _top_zero_frame;
}
void push_zero_frame(ZeroFrame *frame) {
*(ZeroFrame **) frame = _top_zero_frame;
_top_zero_frame = frame;
}
void pop_zero_frame() {
zero_stack()->set_sp((intptr_t *) _top_zero_frame + 1);
_top_zero_frame = *(ZeroFrame **) _top_zero_frame;
}
public:
static ByteSize zero_stack_offset() {
return byte_offset_of(JavaThread, _zero_stack);
}
static ByteSize top_zero_frame_offset() {
return byte_offset_of(JavaThread, _top_zero_frame);
}
public:
void record_base_of_stack_pointer() {
assert(top_zero_frame() == NULL, "junk on stack prior to Java call");
}
void set_base_of_stack_pointer(intptr_t* base_sp) {
assert(base_sp == NULL, "should be");
assert(top_zero_frame() == NULL, "junk on stack after Java call");
}
public:
void set_last_Java_frame() {
set_last_Java_frame(top_zero_frame(), zero_stack()->sp());
}
void reset_last_Java_frame() {
frame_anchor()->zap();
}
void set_last_Java_frame(ZeroFrame* fp, intptr_t* sp) {
frame_anchor()->set(sp, NULL, fp);
}
public:
ZeroFrame* last_Java_fp() {
return frame_anchor()->last_Java_fp();
}
private:
frame pd_last_frame() {
assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
return frame(last_Java_fp(), last_Java_sp());
}
public:
static ByteSize last_Java_fp_offset() {
return byte_offset_of(JavaThread, _anchor) +
JavaFrameAnchor::last_Java_fp_offset();
}
public:
// Check for pending suspend requests and pending asynchronous
// exceptions. There are separate accessors for these, but
// _suspend_flags is volatile so using them would be unsafe.
bool has_special_condition_for_native_trans() {
return _suspend_flags != 0;
}
public:
bool pd_get_top_frame_for_signal_handler(frame* fr_addr,
void* ucontext,
bool isInJava) {
ShouldNotCallThis();
return false; // silence compile warning
}
bool pd_get_top_frame_for_profiling(frame* fr_addr,
void* ucontext,
bool isInJava) {
ShouldNotCallThis();
return false; // silence compile warning
}
// These routines are only used on cpu architectures that
// have separate register stacks (Itanium).
static bool register_stack_overflow() { return false; }
static void enable_register_stack_guard() {}
static void disable_register_stack_guard() {}
#endif // OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP