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hotspot/src/share/vm/prims/stackwalk.cpp
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@@ -35,47 +35,47 @@
#include "runtime/javaCalls.hpp"
#include "runtime/vframe.hpp"
#include "utilities/globalDefinitions.hpp"
// setup and cleanup actions
-void StackWalkAnchor::setup_magic_on_entry(objArrayHandle classes_array) {
- classes_array->obj_at_put(magic_pos, _thread->threadObj());
+void StackWalkAnchor::setup_magic_on_entry(objArrayHandle frames_array) {
+ frames_array->obj_at_put(magic_pos, _thread->threadObj());
_anchor = address_value();
- assert(check_magic(classes_array), "invalid magic");
+ assert(check_magic(frames_array), "invalid magic");
}
-bool StackWalkAnchor::check_magic(objArrayHandle classes_array) {
- oop m1 = classes_array->obj_at(magic_pos);
+bool StackWalkAnchor::check_magic(objArrayHandle frames_array) {
+ oop m1 = frames_array->obj_at(magic_pos);
jlong m2 = _anchor;
if (m1 == _thread->threadObj() && m2 == address_value()) return true;
return false;
}
-bool StackWalkAnchor::cleanup_magic_on_exit(objArrayHandle classes_array) {
- bool ok = check_magic(classes_array);
- classes_array->obj_at_put(magic_pos, NULL);
+bool StackWalkAnchor::cleanup_magic_on_exit(objArrayHandle frames_array) {
+ bool ok = check_magic(frames_array);
+ frames_array->obj_at_put(magic_pos, NULL);
_anchor = 0L;
return ok;
}
// Returns StackWalkAnchor for the current stack being traversed.
//
// Parameters:
// thread Current Java thread.
// magic Magic value used for each stack walking
-// classes_array User-supplied buffers. The 0th element is reserved
+// frames_array User-supplied buffers. The 0th element is reserved
// to this StackWalkAnchor to use
//
StackWalkAnchor* StackWalkAnchor::from_current(JavaThread* thread, jlong magic,
- objArrayHandle classes_array)
+ objArrayHandle frames_array)
{
assert(thread != NULL && thread->is_Java_thread(), "");
- oop m1 = classes_array->obj_at(magic_pos);
+ oop m1 = frames_array->obj_at(magic_pos);
if (m1 != thread->threadObj()) return NULL;
if (magic == 0L) return NULL;
StackWalkAnchor* anchor = (StackWalkAnchor*) (intptr_t) magic;
- if (!anchor->is_valid_in(thread, classes_array)) return NULL;
+ if (!anchor->is_valid_in(thread, frames_array)) return NULL;
return anchor;
}
// Unpacks one or more frames into user-supplied buffers.
// Updates the end index, and returns the number of unpacked frames.
@@ -86,28 +86,28 @@
// Parameters:
// mode Restrict which frames to be decoded.
// vfst vFrameStream.
// max_nframes Maximum number of frames to be filled.
// start_index Start index to the user-supplied buffers.
-// classes_array Buffer to store classes in, starting at start_index.
-// frames_array Buffer to store StackFrame in, starting at start_index.
-// NULL if not used.
+// frames_array Buffer to store Class or StackFrame in, starting at start_index.
+// frames array is a Class<?>[] array when only getting caller
+// reference, and a StackFrameInfo[] array (or derivative)
+// otherwise. It should never be null.
// end_index End index to the user-supplied buffers with unpacked frames.
//
// Returns the number of frames whose information was transferred into the buffers.
//
int StackWalk::fill_in_frames(jlong mode, vframeStream& vfst,
int max_nframes, int start_index,
- objArrayHandle classes_array,
objArrayHandle frames_array,
int& end_index, TRAPS) {
if (TraceStackWalk) {
tty->print_cr("fill_in_frames limit=%d start=%d frames length=%d",
- max_nframes, start_index, classes_array->length());
+ max_nframes, start_index, frames_array->length());
}
assert(max_nframes > 0, "invalid max_nframes");
- assert(start_index + max_nframes <= classes_array->length(), "oob");
+ assert(start_index + max_nframes <= frames_array->length(), "oob");
int frames_decoded = 0;
for (; !vfst.at_end(); vfst.next()) {
Method* method = vfst.method();
int bci = vfst.bci();
@@ -127,18 +127,22 @@
if (TraceStackWalk) {
tty->print(" %d: frame method: ", index); method->print_short_name();
tty->print_cr(" bci=%d", bci);
}
- classes_array->obj_at_put(index, method->method_holder()->java_mirror());
// fill in StackFrameInfo and initialize MemberName
if (live_frame_info(mode)) {
+ assert (use_frames_array(mode), "Bad mode for get live frame");
Handle stackFrame(frames_array->obj_at(index));
fill_live_stackframe(stackFrame, method, bci, vfst.java_frame(), CHECK_0);
} else if (need_method_info(mode)) {
+ assert (use_frames_array(mode), "Bad mode for get stack frame");
Handle stackFrame(frames_array->obj_at(index));
fill_stackframe(stackFrame, method, bci);
+ } else {
+ assert (use_frames_array(mode) == false, "Bad mode for get caller class");
+ frames_array->obj_at_put(index, method->method_holder()->java_mirror());
}
if (++frames_decoded >= max_nframes) break;
}
return frames_decoded;
}
@@ -277,32 +281,30 @@
// stackStream StackStream object
// mode Stack walking mode.
// skip_frames Number of frames to be skipped.
// frame_count Number of frames to be traversed.
// start_index Start index to the user-supplied buffers.
-// classes_array Buffer to store classes in, starting at start_index.
// frames_array Buffer to store StackFrame in, starting at start_index.
-// NULL if not used.
+// frames array is a Class<?>[] array when only getting caller
+// reference, and a StackFrameInfo[] array (or derivative)
+// otherwise. It should never be null.
//
// Returns Object returned from AbstractStackWalker::doStackWalk call.
//
oop StackWalk::walk(Handle stackStream, jlong mode,
int skip_frames, int frame_count, int start_index,
- objArrayHandle classes_array,
objArrayHandle frames_array,
TRAPS) {
JavaThread* jt = (JavaThread*)THREAD;
if (TraceStackWalk) {
tty->print_cr("Start walking: mode " JLONG_FORMAT " skip %d frames batch size %d",
mode, skip_frames, frame_count);
}
- if (need_method_info(mode)) {
if (frames_array.is_null()) {
THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", NULL);
}
- }
Klass* stackWalker_klass = SystemDictionary::StackWalker_klass();
Klass* abstractStackWalker_klass = SystemDictionary::AbstractStackWalker_klass();
methodHandle m_doStackWalk(THREAD, Universe::do_stack_walk_method());
@@ -311,12 +313,10 @@
// This stream will be made available by *reference* to the inner Java call.
StackWalkAnchor anchor(jt);
vframeStream& vfst = anchor.vframe_stream();
{
- // Skip all methods from AbstractStackWalker and StackWalk (enclosing method)
- if (!fill_in_stacktrace(mode)) {
while (!vfst.at_end()) {
InstanceKlass* ik = vfst.method()->method_holder();
if (ik != stackWalker_klass &&
ik != abstractStackWalker_klass && ik->super() != abstractStackWalker_klass) {
break;
@@ -325,39 +325,10 @@
if (TraceStackWalk) {
tty->print(" skip "); vfst.method()->print_short_name(); tty->print("\n");
}
vfst.next();
}
- }
-
- // For exceptions, skip Throwable::fillInStackTrace and <init> methods
- // of the exception class and superclasses
- if (fill_in_stacktrace(mode)) {
- bool skip_to_fillInStackTrace = false;
- bool skip_throwableInit_check = false;
- while (!vfst.at_end() && !skip_throwableInit_check) {
- InstanceKlass* ik = vfst.method()->method_holder();
- Method* method = vfst.method();
- if (!skip_to_fillInStackTrace) {
- if (ik == SystemDictionary::Throwable_klass() &&
- method->name() == vmSymbols::fillInStackTrace_name()) {
- // this frame will be skipped
- skip_to_fillInStackTrace = true;
- }
- } else if (!(ik->is_subclass_of(SystemDictionary::Throwable_klass()) &&
- method->name() == vmSymbols::object_initializer_name())) {
- // there are none or we've seen them all - either way stop checking
- skip_throwableInit_check = true;
- break;
- }
-
- if (TraceStackWalk) {
- tty->print("stack walk: skip "); vfst.method()->print_short_name(); tty->print("\n");
- }
- vfst.next();
- }
- }
// stack frame has been traversed individually and resume stack walk
// from the stack frame at depth == skip_frames.
for (int n=0; n < skip_frames && !vfst.at_end(); vfst.next(), n++) {
if (TraceStackWalk) {
@@ -370,11 +341,11 @@
// The Method* pointer in the vfst has a very short shelf life. Grab it now.
int end_index = start_index;
int numFrames = 0;
if (!vfst.at_end()) {
- numFrames = fill_in_frames(mode, vfst, frame_count, start_index, classes_array,
+ numFrames = fill_in_frames(mode, vfst, frame_count, start_index,
frames_array, end_index, CHECK_NULL);
if (numFrames < 1) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "stack walk: decode failed", NULL);
}
}
@@ -390,16 +361,16 @@
args.push_int(frame_count);
args.push_int(start_index);
args.push_int(end_index);
// Link the thread and vframe stream into the callee-visible object
- anchor.setup_magic_on_entry(classes_array);
+ anchor.setup_magic_on_entry(frames_array);
JavaCalls::call(&result, m_doStackWalk, &args, THREAD);
// Do this before anything else happens, to disable any lingering stream objects
- bool ok = anchor.cleanup_magic_on_exit(classes_array);
+ bool ok = anchor.cleanup_magic_on_exit(frames_array);
// Throw pending exception if we must
(void) (CHECK_NULL);
if (!ok) {
@@ -417,50 +388,47 @@
// stackStream StackStream object
// mode Stack walking mode.
// magic Must be valid value to continue the stack walk
// frame_count Number of frames to be decoded.
// start_index Start index to the user-supplied buffers.
-// classes_array Buffer to store classes in, starting at start_index.
// frames_array Buffer to store StackFrame in, starting at start_index.
-// NULL if not used.
//
// Returns the end index of frame filled in the buffer.
//
jint StackWalk::moreFrames(Handle stackStream, jlong mode, jlong magic,
int frame_count, int start_index,
- objArrayHandle classes_array,
objArrayHandle frames_array,
TRAPS)
{
JavaThread* jt = (JavaThread*)THREAD;
- StackWalkAnchor* existing_anchor = StackWalkAnchor::from_current(jt, magic, classes_array);
+ StackWalkAnchor* existing_anchor = StackWalkAnchor::from_current(jt, magic, frames_array);
if (existing_anchor == NULL) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: corrupted buffers", 0L);
}
- if ((need_method_info(mode) || live_frame_info(mode)) && frames_array.is_null()) {
+ if (frames_array.is_null()) {
THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", 0L);
}
if (TraceStackWalk) {
tty->print_cr("StackWalk::moreFrames frame_count %d existing_anchor " PTR_FORMAT " start %d frames %d",
- frame_count, p2i(existing_anchor), start_index, classes_array->length());
+ frame_count, p2i(existing_anchor), start_index, frames_array->length());
}
int end_index = start_index;
if (frame_count <= 0) {
return end_index; // No operation.
}
int count = frame_count + start_index;
- assert (classes_array->length() >= count, "not enough space in buffers");
+ assert (frames_array->length() >= count, "not enough space in buffers");
StackWalkAnchor& anchor = (*existing_anchor);
vframeStream& vfst = anchor.vframe_stream();
if (!vfst.at_end()) {
vfst.next(); // this was the last frame decoded in the previous batch
if (!vfst.at_end()) {
- int n = fill_in_frames(mode, vfst, frame_count, start_index, classes_array,
+ int n = fill_in_frames(mode, vfst, frame_count, start_index,
frames_array, end_index, CHECK_0);
if (n < 1) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: later decode failed", 0L);
}
return end_index;
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