JDK14/Java14源码在线阅读
/*
* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2016, 2019, SAP SE. 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
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*/
#include "precompiled.hpp"
#include "interpreter/interpreter.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/markWord.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/monitorChunk.hpp"
#include "runtime/os.inline.hpp"
#include "runtime/signature.hpp"
#include "runtime/stubCodeGenerator.hpp"
#include "runtime/stubRoutines.hpp"
#include "vmreg_s390.inline.hpp"
#ifdef COMPILER1
#include "c1/c1_Runtime1.hpp"
#include "runtime/vframeArray.hpp"
#endif
// Major contributions by Aha, AS.
#ifdef ASSERT
void RegisterMap::check_location_valid() {
}
#endif // ASSERT
// Profiling/safepoint support
bool frame::safe_for_sender(JavaThread *thread) {
bool safe = false;
address sp = (address)_sp;
address fp = (address)_fp;
address unextended_sp = (address)_unextended_sp;
// Consider stack guards when trying to determine "safe" stack pointers
static size_t stack_guard_size = os::uses_stack_guard_pages() ?
JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_reserved_zone_size() : 0;
size_t usable_stack_size = thread->stack_size() - stack_guard_size;
// sp must be within the usable part of the stack (not in guards)
bool sp_safe = (sp < thread->stack_base()) &&
(sp >= thread->stack_base() - usable_stack_size);
if (!sp_safe) {
return false;
}
// Unextended sp must be within the stack
bool unextended_sp_safe = (unextended_sp < thread->stack_base());
if (!unextended_sp_safe) {
return false;
}
// An fp must be within the stack and above (but not equal) sp.
bool fp_safe = (fp <= thread->stack_base()) && (fp > sp);
// An interpreter fp must be within the stack and above (but not equal) sp.
// Moreover, it must be at least the size of the z_ijava_state structure.
bool fp_interp_safe = (fp <= thread->stack_base()) && (fp > sp) &&
((fp - sp) >= z_ijava_state_size);
// We know sp/unextended_sp are safe, only fp is questionable here
// If the current frame is known to the code cache then we can attempt to
// to construct the sender and do some validation of it. This goes a long way
// toward eliminating issues when we get in frame construction code
if (_cb != NULL ) {
// Entry frame checks
if (is_entry_frame()) {
// An entry frame must have a valid fp.
return fp_safe && is_entry_frame_valid(thread);
}
// Now check if the frame is complete and the test is
// reliable. Unfortunately we can only check frame completeness for
// runtime stubs. Other generic buffer blobs are more
// problematic so we just assume they are OK. Adapter blobs never have a
// complete frame and are never OK. nmethods should be OK on s390.
if (!_cb->is_frame_complete_at(_pc)) {
if (_cb->is_adapter_blob() || _cb->is_runtime_stub()) {
return false;
}
}
// Could just be some random pointer within the codeBlob.
if (!_cb->code_contains(_pc)) {
return false;
}
if (is_interpreted_frame() && !fp_interp_safe) {
return false;
}
z_abi_160* sender_abi = (z_abi_160*) fp;
intptr_t* sender_sp = (intptr_t*) sender_abi->callers_sp;
address sender_pc = (address) sender_abi->return_pc;
// We must always be able to find a recognizable pc.
CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
if (sender_blob == NULL) {
return false;
}
// Could be a zombie method
if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
return false;
}
// It should be safe to construct the sender though it might not be valid.
frame sender(sender_sp, sender_pc);
// Do we have a valid fp?
address sender_fp = (address) sender.fp();
// sender_fp must be within the stack and above (but not
// equal) current frame's fp.
if (sender_fp > thread->stack_base() || sender_fp <= fp) {
return false;
}
// If the potential sender is the interpreter then we can do some more checking.
if (Interpreter::contains(sender_pc)) {
return sender.is_interpreted_frame_valid(thread);
}
// Could just be some random pointer within the codeBlob.
if (!sender.cb()->code_contains(sender_pc)) {
return false;
}
// We should never be able to see an adapter if the current frame is something from code cache.
if (sender_blob->is_adapter_blob()) {
return false;
}
if (sender.is_entry_frame()) {
return sender.is_entry_frame_valid(thread);
}
// Frame size is always greater than zero. If the sender frame size is zero or less,
// something is really weird and we better give up.
if (sender_blob->frame_size() <= 0) {
return false;
}
return true;
}
// Must be native-compiled frame. Since sender will try and use fp to find
// linkages it must be safe
if (!fp_safe) {
return false;
}
return true;
}
bool frame::is_interpreted_frame() const {
return Interpreter::contains(pc());
}
// sender_sp
intptr_t* frame::interpreter_frame_sender_sp() const {
return sender_sp();
}
frame frame::sender_for_entry_frame(RegisterMap *map) const {
assert(map != NULL, "map must be set");
// Java frame called from C. Skip all C frames and return top C
// frame of that chunk as the sender.
JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
assert(!entry_frame_is_first(), "next Java sp must be non zero");
assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack");
map->clear();
assert(map->include_argument_oops(), "should be set by clear");
if (jfa->last_Java_pc() != NULL) {
frame fr(jfa->last_Java_sp(), jfa->last_Java_pc());
return fr;
}
// Last_java_pc is not set if we come here from compiled code.
frame fr(jfa->last_Java_sp());
return fr;
}
frame frame::sender_for_interpreter_frame(RegisterMap *map) const {
// Pass callers sender_sp as unextended_sp.
return frame(sender_sp(), sender_pc(), (intptr_t*)(ijava_state()->sender_sp));
}
frame frame::sender_for_compiled_frame(RegisterMap *map) const {
assert(map != NULL, "map must be set");
// Frame owned by compiler.
address pc = *compiled_sender_pc_addr(_cb);
frame caller(compiled_sender_sp(_cb), pc);
// Now adjust the map.
// Get the rest.
if (map->update_map()) {
// Tell GC to use argument oopmaps for some runtime stubs that need it.
map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
if (_cb->oop_maps() != NULL) {
OopMapSet::update_register_map(this, map);
}
}
return caller;
}
intptr_t* frame::compiled_sender_sp(CodeBlob* cb) const {
return sender_sp();
}
address* frame::compiled_sender_pc_addr(CodeBlob* cb) const {
return sender_pc_addr();
}
frame frame::sender(RegisterMap* map) const {
// Default is we don't have to follow them. The sender_for_xxx will
// update it accordingly.
map->set_include_argument_oops(false);
if (is_entry_frame()) {
return sender_for_entry_frame(map);
}
if (is_interpreted_frame()) {
return sender_for_interpreter_frame(map);
}
assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
if (_cb != NULL) {
return sender_for_compiled_frame(map);
}
// Must be native-compiled frame, i.e. the marshaling code for native
// methods that exists in the core system.
return frame(sender_sp(), sender_pc());
}
void frame::patch_pc(Thread* thread, address pc) {
if (TracePcPatching) {
tty->print_cr("patch_pc at address " PTR_FORMAT " [" PTR_FORMAT " -> " PTR_FORMAT "] ",
p2i(&((address*) _sp)[-1]), p2i(((address*) _sp)[-1]), p2i(pc));
}
own_abi()->return_pc = (uint64_t)pc;
_cb = CodeCache::find_blob(pc);
address original_pc = CompiledMethod::get_deopt_original_pc(this);
if (original_pc != NULL) {
assert(original_pc == _pc, "expected original to be stored before patching");
_deopt_state = is_deoptimized;
// Leave _pc as is.
} else {
_deopt_state = not_deoptimized;
_pc = pc;
}
}
bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
// Is there anything to do?
assert(is_interpreted_frame(), "Not an interpreted frame");
return true;
}
BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
assert(is_interpreted_frame(), "interpreted frame expected");
Method* method = interpreter_frame_method();
BasicType type = method->result_type();
if (method->is_native()) {
address lresult = (address)&(ijava_state()->lresult);
address fresult = (address)&(ijava_state()->fresult);
switch (type) {
case T_OBJECT:
case T_ARRAY: {
*oop_result = (oop) (void*) ijava_state()->oop_tmp;
break;
}
// We use std/stfd to store the values.
case T_BOOLEAN : value_result->z = (jboolean) *(unsigned long*)lresult; break;
case T_INT : value_result->i = (jint) *(long*)lresult; break;
case T_CHAR : value_result->c = (jchar) *(unsigned long*)lresult; break;
case T_SHORT : value_result->s = (jshort) *(long*)lresult; break;
case T_BYTE : value_result->z = (jbyte) *(long*)lresult; break;
case T_LONG : value_result->j = (jlong) *(long*)lresult; break;
case T_FLOAT : value_result->f = (jfloat) *(float*)fresult; break;
case T_DOUBLE : value_result->d = (jdouble) *(double*)fresult; break;
case T_VOID : break; // Nothing to do.
default : ShouldNotReachHere();
}
} else {
intptr_t* tos_addr = interpreter_frame_tos_address();
switch (type) {
case T_OBJECT:
case T_ARRAY: {
oop obj = *(oop*)tos_addr;
assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
*oop_result = obj;
break;
}
case T_BOOLEAN : value_result->z = (jboolean) *(jint*)tos_addr; break;
case T_BYTE : value_result->b = (jbyte) *(jint*)tos_addr; break;
case T_CHAR : value_result->c = (jchar) *(jint*)tos_addr; break;
case T_SHORT : value_result->s = (jshort) *(jint*)tos_addr; break;
case T_INT : value_result->i = *(jint*)tos_addr; break;
case T_LONG : value_result->j = *(jlong*)tos_addr; break;
case T_FLOAT : value_result->f = *(jfloat*)tos_addr; break;
case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
case T_VOID : break; // Nothing to do.
default : ShouldNotReachHere();
}
}
return type;
}
// Dump all frames starting a given C stack-pointer.
// Use max_frames to limit the number of traced frames.
void frame::back_trace(outputStream* st, intptr_t* start_sp, intptr_t* top_pc, unsigned long flags, int max_frames) {
static char buf[ 150 ];
bool print_outgoing_arguments = flags & 0x1;
bool print_istate_pointers = flags & 0x2;
int num = 0;
intptr_t* current_sp = (intptr_t*) start_sp;
int last_num_jargs = 0;
int frame_type = 0;
int last_frame_type = 0;
while (current_sp) {
intptr_t* current_fp = (intptr_t*) *current_sp;
address current_pc = (num == 0)
? (address) top_pc
: (address) *((intptr_t*)(((address) current_sp) + _z_abi(return_pc)));
if ((intptr_t*) current_fp != 0 && (intptr_t*) current_fp <= current_sp) {
st->print_cr("ERROR: corrupt stack");
return;
}
st->print("#%-3d ", num);
const char* type_name = " ";
const char* function_name = NULL;
// Detect current frame's frame_type, default to 'C frame'.
frame_type = 0;
CodeBlob* blob = NULL;
if (Interpreter::contains(current_pc)) {
frame_type = 1;
} else if (StubRoutines::contains(current_pc)) {
if (StubRoutines::returns_to_call_stub(current_pc)) {
frame_type = 2;
} else {
frame_type = 4;
type_name = "stu";
StubCodeDesc* desc = StubCodeDesc::desc_for (current_pc);
if (desc) {
function_name = desc->name();
} else {
function_name = "unknown stub";
}
}
} else if (CodeCache::contains(current_pc)) {
blob = CodeCache::find_blob_unsafe(current_pc);
if (blob) {
if (blob->is_nmethod()) {
frame_type = 3;
} else if (blob->is_deoptimization_stub()) {
frame_type = 4;
type_name = "deo";
function_name = "deoptimization blob";
} else if (blob->is_uncommon_trap_stub()) {
frame_type = 4;
type_name = "uct";
function_name = "uncommon trap blob";
} else if (blob->is_exception_stub()) {
frame_type = 4;
type_name = "exc";
function_name = "exception blob";
} else if (blob->is_safepoint_stub()) {
frame_type = 4;
type_name = "saf";
function_name = "safepoint blob";
} else if (blob->is_runtime_stub()) {
frame_type = 4;
type_name = "run";
function_name = ((RuntimeStub *)blob)->name();
} else if (blob->is_method_handles_adapter_blob()) {
frame_type = 4;
type_name = "mha";
function_name = "method handles adapter blob";
} else {
frame_type = 4;
type_name = "blo";
function_name = "unknown code blob";
}
} else {
frame_type = 4;
type_name = "blo";
function_name = "unknown code blob";
}
}
st->print("sp=" PTR_FORMAT " ", p2i(current_sp));
if (frame_type == 0) {
current_pc = (address) *((intptr_t*)(((address) current_sp) + _z_abi(gpr14)));
}
st->print("pc=" PTR_FORMAT " ", p2i(current_pc));
st->print(" ");
switch (frame_type) {
case 0: // C frame:
{
st->print(" ");
if (current_pc == 0) {
st->print("? ");
} else {
// name
int func_offset;
char demangled_name[256];
int demangled_name_len = 256;
if (os::dll_address_to_function_name(current_pc, demangled_name, demangled_name_len, &func_offset)) {
demangled_name[demangled_name_len-1] = '\0';
st->print(func_offset == -1 ? "%s " : "%s+0x%x", demangled_name, func_offset);
} else {
st->print("? ");
}
}
}
break;
case 1: // interpreter frame:
{
st->print(" i ");
if (last_frame_type != 1) last_num_jargs = 8;
// name
Method* method = *(Method**)((address)current_fp + _z_ijava_state_neg(method));
if (method) {
ResourceMark rm;
if (method->is_synchronized()) st->print("synchronized ");
if (method->is_static()) st->print("static ");
if (method->is_native()) st->print("native ");
method->name_and_sig_as_C_string(buf, sizeof(buf));
st->print("%s ", buf);
}
else
st->print("? ");
intptr_t* tos = (intptr_t*) *(intptr_t*)((address)current_fp + _z_ijava_state_neg(esp));
if (print_istate_pointers) {
st->cr();
st->print(" ");
st->print("ts=" PTR_FORMAT " ", p2i(tos));
}
// Dump some Java stack slots.
if (print_outgoing_arguments) {
if (method->is_native()) {
#ifdef ASSERT
intptr_t* cargs = (intptr_t*) (((address)current_sp) + _z_abi(carg_1));
for (int i = 0; i < last_num_jargs; i++) {
// Cargs is not prepushed.
st->cr();
st->print(" ");
st->print(PTR_FORMAT, *(cargs));
cargs++;
}
#endif /* ASSERT */
}
else {
if (tos) {
for (int i = 0; i < last_num_jargs; i++) {
// tos+0 is prepushed, ignore.
tos++;
if (tos >= (intptr_t *)((address)current_fp + _z_ijava_state_neg(monitors)))
break;
st->cr();
st->print(" ");
st->print(PTR_FORMAT " %+.3e %+.3le", *(tos), *(float*)(tos), *(double*)(tos));
}
}
}
last_num_jargs = method->size_of_parameters();
}
}
break;
case 2: // entry frame:
{
st->print("v2i ");
// name
st->print("call stub");
}
break;
case 3: // compiled frame:
{
st->print(" c ");
// name
Method* method = ((nmethod *)blob)->method();
if (method) {
ResourceMark rm;
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