128 // which can be different from the sender unextended sp (the sp seen
129 // by the sender) because of current frame local variables
130 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
131 sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
132 saved_fp = (intptr_t*) this->fp()[link_offset];
133
134 } else {
135 // must be some sort of compiled/runtime frame
136 // fp does not have to be safe (although it could be check for c1?)
137
138 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
139 if (_cb->frame_size() <= 0) {
140 return false;
141 }
142
143 sender_sp = _unextended_sp + _cb->frame_size();
144 // Is sender_sp safe?
145 if (!thread->is_in_full_stack_checked((address)sender_sp)) {
146 return false;
147 }
148 sender_unextended_sp = sender_sp;
149 // On Intel the return_address is always the word on the stack
150 sender_pc = (address) *(sender_sp-1);
151 // Note: frame::sender_sp_offset is only valid for compiled frame
152 saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
153 }
154
155 if (Continuation::is_return_barrier_entry(sender_pc)) {
156 // sender_pc might be invalid so check that the frame
157 // actually belongs to a Continuation.
158 if (!Continuation::is_frame_in_continuation(thread, *this)) {
159 return false;
160 }
161 // If our sender_pc is the return barrier, then our "real" sender is the continuation entry
162 frame s = Continuation::continuation_bottom_sender(thread, *this, sender_sp);
163 sender_sp = s.sp();
164 sender_pc = s.pc();
165 }
166
167 // If the potential sender is the interpreter then we can do some more checking
168 if (Interpreter::contains(sender_pc)) {
169
170 // ebp is always saved in a recognizable place in any code we generate. However
171 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
172 // is really a frame pointer.
173
174 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
679 Continuation::is_return_barrier_entry(ret_pc) ? "return address (return barrier)" : "return address");
680 values.describe(-1, fp_loc, "saved fp", 0); // "unowned" as value belongs to sender
681 }
682 }
683
684 #endif // !PRODUCT
685
686 intptr_t *frame::initial_deoptimization_info() {
687 // used to reset the saved FP
688 return fp();
689 }
690
691 #ifndef PRODUCT
692 // This is a generic constructor which is only used by pns() in debug.cpp.
693 frame::frame(void* sp, void* fp, void* pc) {
694 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
695 }
696
697 #endif
698
699 void JavaFrameAnchor::make_walkable() {
700 // last frame set?
701 if (last_Java_sp() == nullptr) return;
702 // already walkable?
703 if (walkable()) return;
704 vmassert(last_Java_pc() == nullptr, "already walkable");
705 _last_Java_pc = (address)_last_Java_sp[-1];
706 vmassert(walkable(), "something went wrong");
707 }
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128 // which can be different from the sender unextended sp (the sp seen
129 // by the sender) because of current frame local variables
130 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
131 sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
132 saved_fp = (intptr_t*) this->fp()[link_offset];
133
134 } else {
135 // must be some sort of compiled/runtime frame
136 // fp does not have to be safe (although it could be check for c1?)
137
138 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
139 if (_cb->frame_size() <= 0) {
140 return false;
141 }
142
143 sender_sp = _unextended_sp + _cb->frame_size();
144 // Is sender_sp safe?
145 if (!thread->is_in_full_stack_checked((address)sender_sp)) {
146 return false;
147 }
148 // On Intel the return_address is always the word on the stack
149 sender_pc = (address) *(sender_sp-1);
150 // Note: frame::sender_sp_offset is only valid for compiled frame
151 intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
152 saved_fp = *saved_fp_addr;
153
154 // Repair the sender sp if this is a method with scalarized inline type args
155 sender_sp = repair_sender_sp(sender_sp, saved_fp_addr);
156 sender_unextended_sp = sender_sp;
157 }
158 if (Continuation::is_return_barrier_entry(sender_pc)) {
159 // sender_pc might be invalid so check that the frame
160 // actually belongs to a Continuation.
161 if (!Continuation::is_frame_in_continuation(thread, *this)) {
162 return false;
163 }
164 // If our sender_pc is the return barrier, then our "real" sender is the continuation entry
165 frame s = Continuation::continuation_bottom_sender(thread, *this, sender_sp);
166 sender_sp = s.sp();
167 sender_pc = s.pc();
168 }
169
170 // If the potential sender is the interpreter then we can do some more checking
171 if (Interpreter::contains(sender_pc)) {
172
173 // ebp is always saved in a recognizable place in any code we generate. However
174 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
175 // is really a frame pointer.
176
177 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
682 Continuation::is_return_barrier_entry(ret_pc) ? "return address (return barrier)" : "return address");
683 values.describe(-1, fp_loc, "saved fp", 0); // "unowned" as value belongs to sender
684 }
685 }
686
687 #endif // !PRODUCT
688
689 intptr_t *frame::initial_deoptimization_info() {
690 // used to reset the saved FP
691 return fp();
692 }
693
694 #ifndef PRODUCT
695 // This is a generic constructor which is only used by pns() in debug.cpp.
696 frame::frame(void* sp, void* fp, void* pc) {
697 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
698 }
699
700 #endif
701
702 // Check for a method with scalarized inline type arguments that needs
703 // a stack repair and return the repaired sender stack pointer.
704 intptr_t* frame::repair_sender_sp(intptr_t* sender_sp, intptr_t** saved_fp_addr) const {
705 nmethod* nm = _cb->as_nmethod_or_null();
706 if (nm != nullptr && nm->needs_stack_repair()) {
707 // The stack increment resides just below the saved rbp on the stack
708 // and does not account for the return address.
709 intptr_t* real_frame_size_addr = (intptr_t*) (saved_fp_addr - 1);
710 int real_frame_size = ((*real_frame_size_addr) + wordSize) / wordSize;
711 assert(real_frame_size >= _cb->frame_size() && real_frame_size <= 1000000, "invalid frame size");
712 sender_sp = unextended_sp() + real_frame_size;
713 }
714 return sender_sp;
715 }
716
717 void JavaFrameAnchor::make_walkable() {
718 // last frame set?
719 if (last_Java_sp() == nullptr) return;
720 // already walkable?
721 if (walkable()) return;
722 vmassert(last_Java_pc() == nullptr, "already walkable");
723 _last_Java_pc = (address)_last_Java_sp[-1];
724 vmassert(walkable(), "something went wrong");
725 }
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