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 /*

  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.

  * Copyright (c) 2015, 2016, Loongson Technology. 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 "interpreter/interpreter.hpp"

 #include "memory/resourceArea.hpp"

 #include "oops/markOop.hpp"

 #include "oops/method.hpp"

 #include "oops/oop.inline.hpp"

 #include "prims/methodHandles.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/stubCodeGenerator.hpp"

 #include "runtime/stubRoutines.hpp"

 #include "vmreg_mips.inline.hpp"

 #ifdef COMPILER1

 #include "c1/c1_Runtime1.hpp"

 #include "runtime/vframeArray.hpp"

 #endif

 #ifdef ASSERT

 void RegisterMap::check_location_valid() {

 }

 #endif

 // Profiling/safepoint support

 // for Profiling - acting on another frame. walks sender frames

 // if valid.

 // frame profile_find_Java_sender_frame(JavaThread *thread);

 bool frame::safe_for_sender(JavaThread *thread) {

   address   sp = (address)_sp;

   address   fp = (address)_fp;

   bool sp_safe = (sp != NULL &&

       (sp <= thread->stack_base()) &&

       (sp >= thread->stack_base() - thread->stack_size()));

   bool fp_safe = (fp != NULL &&

       (fp <= thread->stack_base()) &&

       (fp >= thread->stack_base() - thread->stack_size()));

   if (sp_safe && fp_safe) {

     CodeBlob *cb = CodeCache::find_blob_unsafe(_pc);

     // 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 != NULL && !cb->is_frame_complete_at(_pc)) {

       if (cb->is_nmethod() || cb->is_adapter_blob() || cb->is_runtime_stub()) {

         return false;

       }

     }

     return true;

   }

   // Note: fp == NULL is not really a prerequisite for this to be safe to

   // walk for c2. However we've modified the code such that if we get

   // a failure with fp != NULL that we then try with FP == NULL.

   // This is basically to mimic what a last_frame would look like if

   // c2 had generated it.

   if (sp_safe && fp == NULL) {

     CodeBlob *cb = CodeCache::find_blob_unsafe(_pc);

     // frame must be complete if fp == NULL as fp == NULL is only sensible

     // if we are looking at a nmethod and frame complete assures us of that.

     if (cb != NULL && cb->is_frame_complete_at(_pc) && cb->is_compiled_by_c2()) {

       return true;

     }

   }

   return false;

 }

 void frame::patch_pc(Thread* thread, address pc) {

   if (TracePcPatching) {

     tty->print_cr("patch_pc at address  0x%x [0x%x -> 0x%x] ", &((address *)_sp)[-1], ((address *)_sp)[-1], pc);

   }

   RegisterMap map((JavaThread *)thread, false);

   frame check = ((JavaThread *)thread)->last_frame();

   if (id() != check.id())

   {

     while (id() != check.sender(&map).id()) {

       check = check.sender(&map);

     }

     if (check.is_interpreted_frame())

       *(check.fp() + 1) = (intptr_t)pc;

     else

       ((address *)_sp)[-1]  = pc;

   }

   _cb = CodeCache::find_blob(pc);

   if (_cb != NULL && _cb->is_nmethod() && ((nmethod*)_cb)->is_deopt_pc(_pc)) {

     address orig = (((nmethod*)_cb)->get_original_pc(this));

     assert(orig == _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() const  {

   return Interpreter::contains(pc());

 }

 int frame::frame_size(RegisterMap* map) const {

   frame sender = this->sender(map);

   return sender.sp() - sp();

 }

 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

 #ifdef CC_INTERP

 intptr_t* frame::interpreter_frame_sender_sp() const {

   assert(is_interpreted_frame(), "interpreted frame expected");

   // QQQ why does this specialize method exist if frame::sender_sp() does same thing?

   // seems odd and if we always know interpreted vs. non then sender_sp() is really

   // doing too much work.

   return get_interpreterState()->sender_sp();

 }

 // monitor elements

 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {

   return get_interpreterState()->monitor_base();

 }

 BasicObjectLock* frame::interpreter_frame_monitor_end() const {

   return (BasicObjectLock*) get_interpreterState()->stack_base();

 }

 #else // CC_INTERP

 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");

   int_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*) *addr_at(interpreter_frame_monitor_block_top_offset);

   // make sure the pointer points inside the frame

   assert((intptr_t) fp() >  (intptr_t) result, "result must <  than frame pointer");

   assert((intptr_t) sp() <= (intptr_t) result, "result must >= than stack pointer");

   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;

 }

 #endif // CC_INTERP

 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");

   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_fp(), jfa->last_Java_pc());

     return fr;

   }

   frame fr(jfa->last_Java_sp(), jfa->last_Java_fp());

   return fr;

 }

 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {

   // sp is the raw sp from the sender after adapter or interpreter extension

   //intptr_t* sp = (intptr_t*) addr_at(sender_sp_offset);

   intptr_t* sp = (intptr_t*) at(interpreter_frame_sender_sp_offset);

   // This is the sp before any possible extension (adapter/locals).

   //intptr_t* unextended_sp = interpreter_frame_sender_sp();

   // The interpreter and compiler(s) always save EBP/RBP in a known

   // location on entry. We must record where that location is

   // so this if EBP/RBP was live on callout from c2 we can find

   // the saved copy no matter what it called.

   // Since the interpreter always saves EBP/RBP if we record where it is then

   // we don't have to always save EBP/RBP on entry and exit to c2 compiled

   // code, on entry will be enough.

 #ifdef COMPILER2

 //FIXME aoqi

   if (map->update_map()) {

     map->set_location(FP->as_VMReg(), (address) addr_at(link_offset));

   }

 #endif /* COMPILER2 */

   return frame(sp, link(), sender_pc());

 }

 //------------------------------------------------------------------------------

 // frame::verify_deopt_original_pc

 //

 // Verifies the calculated original PC of a deoptimization PC for the

 // given unextended SP.  The unextended SP might also be the saved SP

 // for MethodHandle call sites.

 #ifdef ASSERT

 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp, bool is_method_handle_return) {

   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(original_pc), "original PC must be in nmethod");

   assert(nm->is_method_handle_return(original_pc) == is_method_handle_return, "must be");

 }

 #endif

 //------------------------------------------------------------------------------

 // frame::adjust_unextended_sp

 void frame::adjust_unextended_sp() {

   // If we are returning to a compiled MethodHandle call site, the

   // saved_fp will in fact be a saved value of the unextended SP.  The

   // simplest way to tell whether we are returning to such a call site

   // is as follows:

   nmethod* sender_nm = (_cb == NULL) ? NULL : _cb->as_nmethod_or_null();

   if (sender_nm != NULL) {

     // If the sender PC is a deoptimization point, get the original

     // PC.  For MethodHandle call site the unextended_sp is stored in

     // saved_fp.

     if (sender_nm->is_deopt_mh_entry(_pc)) {

       DEBUG_ONLY(verify_deopt_mh_original_pc(sender_nm, _fp));

       _unextended_sp = _fp;

     }

     else if (sender_nm->is_deopt_entry(_pc)) {

       DEBUG_ONLY(verify_deopt_original_pc(sender_nm, _unextended_sp));

     }

     else if (sender_nm->is_method_handle_return(_pc)) {

       _unextended_sp = _fp;

     }

  }

 }

 //------------------------------sender_for_compiled_frame-----------------------

 frame frame::sender_for_compiled_frame(RegisterMap* map) const {

   assert(map != NULL, "map must be set");

   // frame owned by optimizing compiler

   assert(_cb->frame_size() >= 0, "must have non-zero frame size");

   intptr_t* sender_sp = sender_sp = sp() + _cb->frame_size();

 #ifdef ASSERT

   const bool c1_compiled = _cb->is_compiled_by_c1();

   bool native = _cb->is_nmethod() && ((nmethod*)_cb)->is_native_method();

   if (c1_compiled && native) {

     assert(sender_sp == fp() + frame::sender_sp_offset, "incorrect frame size");

   }

 #endif // ASSERT

   // On Intel the return_address is always the word on the stack

   // the fp in compiler points to sender fp, but in interpreter, fp points to return address,

   // so getting sender for compiled frame is not same as interpreter frame.

   // we hard code here temporarily

   // spark

   address sender_pc = (address) *(sender_sp-1);

   intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);

   if (map->update_map()) {

     // Tell GC to use argument oopmaps for some runtime stubs that need it.

     // For C1, the runtime stub might not have oop maps, so set this flag

     // outside of update_register_map.

     map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));

     if (_cb->oop_maps() != NULL) {

       OopMapSet::update_register_map(this, map);

     }

     // Since the prolog does the save and restore of epb there is no oopmap

     // for it so we must fill in its location as if there was an oopmap entry

     // since if our caller was compiled code there could be live jvm state in it.

     map->set_location(FP->as_VMReg(), (address) saved_fp_addr);

   }

   assert(sender_sp != sp(), "must have changed");

   return frame(sender_sp, *saved_fp_addr, sender_pc);

 }

 frame frame::sender(RegisterMap* map) const {

   // Default is we done 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(), link(), sender_pc());

 }

 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) {

   assert(is_interpreted_frame(), "must be interpreter frame");

   Method* method = interpreter_frame_method();

   // When unpacking an optimized frame the frame pointer is

   // adjusted with:

   int diff = (method->max_locals() - method->size_of_parameters()) *

     Interpreter::stackElementWords;

   printf("^^^^^^^^^^^^^^^adjust fp in deopt fp = 0%x \n", (intptr_t)(fp - diff));

   return _fp == (fp - diff);

 }

 void frame::pd_gc_epilog() {

   // nothing done here now

 }

 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {

 // QQQ

 #ifdef CC_INTERP

 #else

   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 (!m->is_valid_method()) return false;

   // stack frames shouldn't be much larger than max_stack elements

   //if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize()) {

   if (fp() - sp() > 4096) {  // stack frames shouldn't be large.

     return false;

   }

   // validate bci/bcx

   intptr_t  bcx    = interpreter_frame_bcx();

   if (m->validate_bci_from_bcx(bcx) < 0) {

     return false;

   }

   // validate ConstantPoolCache*

   ConstantPoolCache* cp = *interpreter_frame_cache_addr();

   if (cp == NULL || !cp->is_metaspace_object()) return false;

   // validate locals

   address locals =  (address) *interpreter_frame_locals_addr();

   if (locals > thread->stack_base() || locals < (address) fp()) return false;

   // We'd have to be pretty unlucky to be mislead at this point

 #endif // CC_INTERP

   return true;

 }

 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {

 #ifdef CC_INTERP

   // Needed for JVMTI. The result should always be in the interpreterState object

   assert(false, "NYI");

   interpreterState istate = get_interpreterState();

 #endif // CC_INTERP

   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()) {

 #ifdef CC_INTERP

         obj = istate->_oop_temp;

 #else

         obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));

 #endif // CC_INTERP

       } else {

         oop* obj_p = (oop*)tos_addr;

         obj = (obj_p == NULL) ? (oop)NULL : *obj_p;

       }

       assert(obj == NULL || Universe::heap()->is_in(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)

 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_mdx);

     DESCRIBE_FP_OFFSET(interpreter_frame_cache);

     DESCRIBE_FP_OFFSET(interpreter_frame_locals);

     DESCRIBE_FP_OFFSET(interpreter_frame_bcx);

     DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);

   }

 }

 #endif

 intptr_t *frame::initial_deoptimization_info() {

   // used to reset the saved FP

   return fp();

 }

 intptr_t* frame::real_fp() const {

   if (_cb != NULL) {

     // use the frame size if valid

     int size = _cb->frame_size();

     if (size > 0) {

       return unextended_sp() + size;

     }

   }

   // else rely on fp()

   assert(! is_compiled_frame(), "unknown compiled frame size");

   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