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/*
* Copyright (c) 1997, 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.
*
*/
#include "precompiled.hpp"
#include "compiler/oopMap.hpp"
#include "interpreter/interpreter.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/markWord.hpp"
#include "oops/method.hpp"
#include "oops/oop.inline.hpp"
#include "prims/methodHandles.hpp"
#include "runtime/continuation.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/monitorChunk.hpp"
#include "runtime/signature.hpp"
#include "runtime/stackWatermarkSet.hpp"
#include "runtime/stubCodeGenerator.hpp"
#include "runtime/stubRoutines.hpp"
#include "vmreg_x86.inline.hpp"
#include "utilities/formatBuffer.hpp"
#ifdef COMPILER1
#include "c1/c1_Runtime1.hpp"
#include "runtime/vframeArray.hpp"
#endif
#ifdef ASSERT
void RegisterMap::check_location_valid() {
}
#endif
// Profiling/safepoint support
bool frame::safe_for_sender(JavaThread *thread) {
if (is_heap_frame()) {
return true;
}
address sp = (address)_sp;
address fp = (address)_fp;
address unextended_sp = (address)_unextended_sp;
// consider stack guards when trying to determine "safe" stack pointers
// sp must be within the usable part of the stack (not in guards)
if (!thread->is_in_usable_stack(sp)) {
return false;
}
// unextended sp must be within the stack and above or equal sp
if (!thread->is_in_stack_range_incl(unextended_sp, sp)) {
return false;
}
// an fp must be within the stack and above (but not equal) sp
// second evaluation on fp+ is added to handle situation where fp is -1
bool fp_safe = thread->is_in_stack_range_excl(fp, sp) &&
thread->is_in_full_stack_checked(fp + (return_addr_offset * sizeof(void*)));
// 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
// 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 ) {
// First check if frame is complete and tester is reliable
// Unfortunately we can only check frame complete for runtime stubs and nmethod
// other generic buffer blobs are more problematic so we just assume they are
// ok. adapter blobs never have a frame complete and are never ok.
if (!_cb->is_frame_complete_at(_pc)) {
if (_cb->is_compiled() || _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;
}
// Entry frame checks
if (is_entry_frame()) {
// an entry frame must have a valid fp.
return fp_safe && is_entry_frame_valid(thread);
} else if (is_upcall_stub_frame()) {
return fp_safe;
}
intptr_t* sender_sp = NULL;
intptr_t* sender_unextended_sp = NULL;
address sender_pc = NULL;
intptr_t* saved_fp = NULL;
if (is_interpreted_frame()) {
// fp must be safe
if (!fp_safe) {
return false;
}
sender_pc = (address) this->fp()[return_addr_offset];
// for interpreted frames, the value below is the sender "raw" sp,
// which can be different from the sender unextended sp (the sp seen
// by the sender) because of current frame local variables
sender_sp = (intptr_t*) addr_at(sender_sp_offset);
sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
saved_fp = (intptr_t*) this->fp()[link_offset];
} else {
// must be some sort of compiled/runtime frame
// fp does not have to be safe (although it could be check for c1?)
// check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
if (_cb->frame_size() <= 0) {
return false;
}
sender_sp = _unextended_sp + _cb->frame_size();
// Is sender_sp safe?
if (!thread->is_in_full_stack_checked((address)sender_sp)) {
return false;
}
sender_unextended_sp = sender_sp;
// On Intel the return_address is always the word on the stack
sender_pc = (address) *(sender_sp-1);
// Note: frame::sender_sp_offset is only valid for compiled frame
saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
}
if (Continuation::is_return_barrier_entry(sender_pc)) {
// If our sender_pc is the return barrier, then our "real" sender is the continuation entry
frame s = Continuation::continuation_bottom_sender(thread, *this, sender_sp);
sender_sp = s.sp();
sender_pc = s.pc();
}
// If the potential sender is the interpreter then we can do some more checking
if (Interpreter::contains(sender_pc)) {
// ebp is always saved in a recognizable place in any code we generate. However
// only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
// is really a frame pointer.
if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
return false;
}
// construct the potential sender
frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
return sender.is_interpreted_frame_valid(thread);
}
// We must always be able to find a recognizable pc
CodeBlob* sender_blob = CodeCache::find_blob(sender_pc);
if (sender_pc == NULL || sender_blob == NULL) {
return false;
}
// Could just be some random pointer within the codeBlob
if (!sender_blob->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;
}
// Could be the call_stub
if (StubRoutines::returns_to_call_stub(sender_pc)) {
if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
return false;
}
// construct the potential sender
frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
// Validate the JavaCallWrapper an entry frame must have
address jcw = (address)sender.entry_frame_call_wrapper();
return thread->is_in_stack_range_excl(jcw, (address)sender.fp());
} else if (sender_blob->is_upcall_stub()) {
return false;
}
CompiledMethod* nm = sender_blob->as_compiled_method_or_null();
if (nm != NULL) {
if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
nm->method()->is_method_handle_intrinsic()) {
return false;
}
}
// If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
// because the return address counts against the callee's frame.
if (sender_blob->frame_size() <= 0) {
assert(!sender_blob->is_compiled(), "should count return address at least");
return false;
}
// We should never be able to see anything here except an nmethod. If something in the
// code cache (current frame) is called by an entity within the code cache that entity
// should not be anything but the call stub (already covered), the interpreter (already covered)
// or an nmethod.
if (!sender_blob->is_compiled()) {
return false;
}
// Could put some more validation for the potential non-interpreted sender
// frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
// One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
// We've validated the potential sender that would be created
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;
}
// Will the pc we fetch be non-zero (which we'll find at the oldest frame)
if ( (address) this->fp()[return_addr_offset] == NULL) return false;
// could try and do some more potential verification of native frame if we could think of some...
return true;
}
void frame::patch_pc(Thread* thread, address pc) {
assert(_cb == CodeCache::find_blob(pc), "unexpected pc");
address* pc_addr = &(((address*) sp())[-1]);
if (TracePcPatching) {
tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
p2i(pc_addr), p2i(*pc_addr), p2i(pc));
}
// Either the return address is the original one or we are going to
// patch in the same address that's already there.
assert(!Continuation::is_return_barrier_entry(*pc_addr), "return barrier");
assert(_pc == *pc_addr || pc == *pc_addr || *pc_addr == 0, "");
DEBUG_ONLY(address old_pc = _pc;)
*pc_addr = pc;
_pc = pc; // must be set before call to get_deopt_original_pc
address original_pc = CompiledMethod::get_deopt_original_pc(this);
if (original_pc != NULL) {
assert(original_pc == old_pc, "expected original PC to be stored before patching");
_deopt_state = is_deoptimized;
_pc = original_pc;
} else {
_deopt_state = not_deoptimized;
}
assert(!is_compiled_frame() || !_cb->as_compiled_method()->is_deopt_entry(_pc), "must be");
#ifdef ASSERT
{
frame f(this->sp(), this->unextended_sp(), this->fp(), pc);
assert(f.is_deoptimized_frame() == this->is_deoptimized_frame() && f.pc() == this->pc() && f.raw_pc() == this->raw_pc(),
"must be (f.is_deoptimized_frame(): %d this->is_deoptimized_frame(): %d "
"f.pc(): " INTPTR_FORMAT " this->pc(): " INTPTR_FORMAT " f.raw_pc(): " INTPTR_FORMAT " this->raw_pc(): " INTPTR_FORMAT ")",
f.is_deoptimized_frame(), this->is_deoptimized_frame(), p2i(f.pc()), p2i(this->pc()), p2i(f.raw_pc()), p2i(this->raw_pc()));
}
#endif
}
intptr_t* frame::entry_frame_argument_at(int offset) const {
// convert offset to index to deal with tsi
int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
// Entry frame's arguments are always in relation to unextended_sp()
return &unextended_sp()[index];
}
// sender_sp
intptr_t* frame::interpreter_frame_sender_sp() const {
assert(is_interpreted_frame(), "interpreted frame expected");
return (intptr_t*) at(interpreter_frame_sender_sp_offset);
}
void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
assert(is_interpreted_frame(), "interpreted frame expected");
ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
}
// monitor elements
BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
}
BasicObjectLock* frame::interpreter_frame_monitor_end() const {
BasicObjectLock* result = (BasicObjectLock*) at(interpreter_frame_monitor_block_top_offset);
// make sure the pointer points inside the frame
assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer: result: " INTPTR_FORMAT " fp: " INTPTR_FORMAT, p2i(result), p2i(fp()));
return result;
}
void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
*((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
}
// Used by template based interpreter deoptimization
void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
*((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = 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 fp must be non zero");
assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
// Since we are walking the stack now this nested anchor is obviously walkable
// even if it wasn't when it was stacked.
jfa->make_walkable();
map->clear();
assert(map->include_argument_oops(), "should be set by clear");
frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
return fr;
}
UpcallStub::FrameData* UpcallStub::frame_data_for_frame(const frame& frame) const {
assert(frame.is_upcall_stub_frame(), "wrong frame");
// need unextended_sp here, since normal sp is wrong for interpreter callees
return reinterpret_cast<UpcallStub::FrameData*>(
reinterpret_cast<address>(frame.unextended_sp()) + in_bytes(_frame_data_offset));
}
bool frame::upcall_stub_frame_is_first() const {
assert(is_upcall_stub_frame(), "must be optimzed entry frame");
UpcallStub* blob = _cb->as_upcall_stub();
JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
return jfa->last_Java_sp() == NULL;
}
frame frame::sender_for_upcall_stub_frame(RegisterMap* map) const {
assert(map != NULL, "map must be set");
UpcallStub* blob = _cb->as_upcall_stub();
// Java frame called from C; skip all C frames and return top C
// frame of that chunk as the sender
JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
assert(!upcall_stub_frame_is_first(), "must have a frame anchor to go back to");
assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
// Since we are walking the stack now this nested anchor is obviously walkable
// even if it wasn't when it was stacked.
jfa->make_walkable();
map->clear();
assert(map->include_argument_oops(), "should be set by clear");
frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
return fr;
}
//------------------------------------------------------------------------------
// frame::verify_deopt_original_pc
//
// Verifies the calculated original PC of a deoptimization PC for the
// given unextended SP.
#ifdef ASSERT
void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
frame fr;
// This is ugly but it's better than to change {get,set}_original_pc
// to take an SP value as argument. And it's only a debugging
// method anyway.
fr._unextended_sp = unextended_sp;
address original_pc = nm->get_original_pc(&fr);
assert(nm->insts_contains_inclusive(original_pc),
"original PC must be in the main code section of the compiled method (or must be immediately following it) original_pc: " INTPTR_FORMAT " unextended_sp: " INTPTR_FORMAT " name: %s", p2i(original_pc), p2i(unextended_sp), nm->name());
}
#endif
//------------------------------------------------------------------------------
// frame::adjust_unextended_sp
#ifdef ASSERT
void frame::adjust_unextended_sp() {
// On x86, sites calling method handle intrinsics and lambda forms are treated
// as any other call site. Therefore, no special action is needed when we are
// returning to any of these call sites.
if (_cb != NULL) {
CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
if (sender_cm != NULL) {
// If the sender PC is a deoptimization point, get the original PC.
if (sender_cm->is_deopt_entry(_pc) ||
sender_cm->is_deopt_mh_entry(_pc)) {
verify_deopt_original_pc(sender_cm, _unextended_sp);
}
}
}
}
#endif
//------------------------------------------------------------------------------
// frame::sender_for_interpreter_frame
frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
// SP is the raw SP from the sender after adapter or interpreter
// extension.
intptr_t* sender_sp = this->sender_sp();
// This is the sp before any possible extension (adapter/locals).
intptr_t* unextended_sp = interpreter_frame_sender_sp();
intptr_t* sender_fp = link();
#if COMPILER2_OR_JVMCI
if (map->update_map()) {
update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
}
#endif // COMPILER2_OR_JVMCI
address sender_pc = this->sender_pc();
if (Continuation::is_return_barrier_entry(sender_pc)) {
if (map->walk_cont()) { // about to walk into an h-stack
return Continuation::top_frame(*this, map);
} else {
return Continuation::continuation_bottom_sender(map->thread(), *this, sender_sp);
}
}
return frame(sender_sp, unextended_sp, sender_fp, sender_pc);
}
bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
assert(is_interpreted_frame(), "Not an interpreted frame");
// These are reasonable sanity checks
if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
return false;
}
if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
return false;
}
if (fp() + interpreter_frame_initial_sp_offset < sp()) {
return false;
}
// These are hacks to keep us out of trouble.
// The problem with these is that they mask other problems
if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
return false;
}
// do some validation of frame elements
// first the method
Method* m = *interpreter_frame_method_addr();
// validate the method we'd find in this potential sender
if (!Method::is_valid_method(m)) return false;
// stack frames shouldn't be much larger than max_stack elements
// this test requires the use the unextended_sp which is the sp as seen by
// the current frame, and not sp which is the "raw" pc which could point
// further because of local variables of the callee method inserted after
// method arguments
if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
return false;
}
// validate bci/bcp
address bcp = interpreter_frame_bcp();
if (m->validate_bci_from_bcp(bcp) < 0) {
return false;
}
// validate ConstantPoolCache*
ConstantPoolCache* cp = *interpreter_frame_cache_addr();
if (MetaspaceObj::is_valid(cp) == false) return false;
// validate locals
address locals = (address) *interpreter_frame_locals_addr();
return thread->is_in_stack_range_incl(locals, (address)fp());
}
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();
intptr_t* tos_addr;
if (method->is_native()) {
// Prior to calling into the runtime to report the method_exit the possible
// return value is pushed to the native stack. If the result is a jfloat/jdouble
// then ST0 is saved before EAX/EDX. See the note in generate_native_result
tos_addr = (intptr_t*)sp();
if (type == T_FLOAT || type == T_DOUBLE) {
// QQQ seems like this code is equivalent on the two platforms
#ifdef AMD64
// This is times two because we do a push(ltos) after pushing XMM0
// and that takes two interpreter stack slots.
tos_addr += 2 * Interpreter::stackElementWords;
#else
tos_addr += 2;
#endif // AMD64
}
} else {
tos_addr = (intptr_t*)interpreter_frame_tos_address();
}
switch (type) {
case T_OBJECT :
case T_ARRAY : {
oop obj;
if (method->is_native()) {
obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
} else {
oop* obj_p = (oop*)tos_addr;
obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
}
assert(Universe::is_in_heap_or_null(obj), "sanity check");
*oop_result = obj;
break;
}
case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
case T_SHORT : value_result->s = *(jshort*)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 : {
#ifdef AMD64
value_result->f = *(jfloat*)tos_addr;
#else
if (method->is_native()) {
jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
value_result->f = (jfloat)d;
} else {
value_result->f = *(jfloat*)tos_addr;
}
#endif // AMD64
break;
}
case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
case T_VOID : /* Nothing to do */ break;
default : ShouldNotReachHere();
}
return type;
}
intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
return &interpreter_frame_tos_address()[index];
}
#ifndef PRODUCT
#define DESCRIBE_FP_OFFSET(name) \
values.describe(frame_no, fp() + frame::name##_offset, #name, 1)
void frame::describe_pd(FrameValues& values, int frame_no) {
if (is_interpreted_frame()) {
DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
DESCRIBE_FP_OFFSET(interpreter_frame_method);
DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
DESCRIBE_FP_OFFSET(interpreter_frame_cache);
DESCRIBE_FP_OFFSET(interpreter_frame_locals);
DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
#ifdef AMD64
} else if (is_entry_frame()) {
// This could be more descriptive if we use the enum in
// stubGenerator to map to real names but it's most important to
// claim these frame slots so the error checking works.
for (int i = 0; i < entry_frame_after_call_words; i++) {
values.describe(frame_no, fp() - i, err_msg("call_stub word fp - %d", i));
}
#endif // AMD64
}
if (is_java_frame() || Continuation::is_continuation_enterSpecial(*this)) {
intptr_t* ret_pc_loc;
intptr_t* fp_loc;
if (is_interpreted_frame()) {
ret_pc_loc = fp() + return_addr_offset;
fp_loc = fp();
} else {
ret_pc_loc = real_fp() - return_addr_offset;
fp_loc = real_fp() - sender_sp_offset;
}
address ret_pc = *(address*)ret_pc_loc;
values.describe(frame_no, ret_pc_loc,
Continuation::is_return_barrier_entry(ret_pc) ? "return address (return barrier)" : "return address");
values.describe(-1, fp_loc, "saved fp", 0); // "unowned" as value belongs to sender
}
}
#endif // !PRODUCT
intptr_t *frame::initial_deoptimization_info() {
// used to reset the saved FP
return fp();
}
#ifndef PRODUCT
// This is a generic constructor which is only used by pns() in debug.cpp.
frame::frame(void* sp, void* fp, void* pc) {
init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
}
#endif
void JavaFrameAnchor::make_walkable() {
// last frame set?
if (last_Java_sp() == NULL) return;
// already walkable?
if (walkable()) return;
vmassert(last_Java_pc() == NULL, "already walkable");
_last_Java_pc = (address)_last_Java_sp[-1];
vmassert(walkable(), "something went wrong");
}
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