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/*
* Copyright (c) 2015, 2022, 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.
*
*/
#ifndef SHARE_PRIMS_STACKWALK_HPP
#define SHARE_PRIMS_STACKWALK_HPP
#include "jvm.h"
#include "oops/oop.hpp"
#include "runtime/continuation.hpp"
#include "runtime/continuationEntry.hpp"
#include "runtime/vframe.hpp"
// BaseFrameStream is an abstract base class for encapsulating the VM-side
// implementation of the StackWalker API. There are two concrete subclasses:
// - JavaFrameStream:
// -based on vframeStream; used in most instances
// - LiveFrameStream:
// -based on javaVFrame; used for retrieving locals/monitors/operands for
// LiveStackFrame
class BaseFrameStream : public StackObj {
private:
enum {
magic_pos = 0
};
JavaThread* _thread;
Handle _continuation;
jlong _anchor;
protected:
void fill_stackframe(Handle stackFrame, const methodHandle& method, TRAPS);
public:
BaseFrameStream(JavaThread* thread, Handle continuation);
virtual void next()=0;
virtual bool at_end()=0;
virtual Method* method()=0;
virtual int bci()=0;
virtual oop cont()=0; // returns the current continuation (even when walking a thread)
virtual const RegisterMap* reg_map()=0;
virtual void fill_frame(int index, objArrayHandle frames_array,
const methodHandle& method, TRAPS)=0;
oop continuation() { return _continuation(); }
void set_continuation(Handle cont);
void setup_magic_on_entry(objArrayHandle frames_array);
bool check_magic(objArrayHandle frames_array);
bool cleanup_magic_on_exit(objArrayHandle frames_array);
bool is_valid_in(Thread* thread, objArrayHandle frames_array) {
return (_thread == thread && check_magic(frames_array));
}
jlong address_value() {
return (jlong) castable_address(this);
}
static BaseFrameStream* from_current(JavaThread* thread, jlong magic, objArrayHandle frames_array);
};
class JavaFrameStream : public BaseFrameStream {
private:
vframeStream _vfst;
bool _need_method_info;
public:
JavaFrameStream(JavaThread* thread, int mode, Handle cont_scope, Handle cont);
const RegisterMap* reg_map() override { return _vfst.reg_map(); };
void next() override;
bool at_end() override { return _vfst.at_end(); }
Method* method() override { return _vfst.method(); }
int bci() override { return _vfst.bci(); }
oop cont() override { return _vfst.continuation(); }
void fill_frame(int index, objArrayHandle frames_array,
const methodHandle& method, TRAPS) override;
};
class LiveFrameStream : public BaseFrameStream {
private:
enum {
MODE_INTERPRETED = 0x01,
MODE_COMPILED = 0x02
};
Handle _cont_scope; // the delimitation of this walk
RegisterMap* _map;
javaVFrame* _jvf;
ContinuationEntry* _cont_entry;
void fill_live_stackframe(Handle stackFrame, const methodHandle& method, TRAPS);
static oop create_primitive_slot_instance(StackValueCollection* values,
int i, BasicType type, TRAPS);
static objArrayHandle monitors_to_object_array(GrowableArray<MonitorInfo*>* monitors,
TRAPS);
static objArrayHandle values_to_object_array(StackValueCollection* values, TRAPS);
public:
LiveFrameStream(JavaThread* thread, RegisterMap* rm, Handle cont_scope, Handle cont);
const RegisterMap* reg_map() override { return _map; };
void next() override;
bool at_end() override { return _jvf == NULL; }
Method* method() override { return _jvf->method(); }
int bci() override { return _jvf->bci(); }
oop cont() override { return continuation() != NULL ? continuation(): ContinuationEntry::cont_oop_or_null(_cont_entry, _map->thread()); }
void fill_frame(int index, objArrayHandle frames_array,
const methodHandle& method, TRAPS) override;
};
class StackWalk : public AllStatic {
private:
static int fill_in_frames(jlong mode, BaseFrameStream& stream,
int max_nframes, int start_index,
objArrayHandle frames_array,
int& end_index, TRAPS);
static inline bool get_caller_class(int mode) {
return (mode & JVM_STACKWALK_GET_CALLER_CLASS) != 0;
}
static inline bool skip_hidden_frames(int mode) {
return (mode & JVM_STACKWALK_SHOW_HIDDEN_FRAMES) == 0;
}
static inline bool live_frame_info(int mode) {
return (mode & JVM_STACKWALK_FILL_LIVE_STACK_FRAMES) != 0;
}
public:
static inline bool need_method_info(int mode) {
return (mode & JVM_STACKWALK_FILL_CLASS_REFS_ONLY) == 0;
}
static inline bool use_frames_array(int mode) {
return (mode & JVM_STACKWALK_FILL_CLASS_REFS_ONLY) == 0;
}
static oop walk(Handle stackStream, jlong mode, int skip_frames, Handle cont_scope, Handle cont,
int frame_count, int start_index, objArrayHandle frames_array,
TRAPS);
static oop fetchFirstBatch(BaseFrameStream& stream, Handle stackStream,
jlong mode, int skip_frames, int frame_count,
int start_index, objArrayHandle frames_array, TRAPS);
static jint fetchNextBatch(Handle stackStream, jlong mode, jlong magic,
int frame_count, int start_index,
objArrayHandle frames_array, TRAPS);
static void setContinuation(Handle stackStream, jlong magic, objArrayHandle frames_array,
Handle cont, TRAPS);
};
#endif // SHARE_PRIMS_STACKWALK_HPP
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