jdk8-mips64-public/hotspot: src/cpu/x86/vm/frame_x86.cpp@22cee0ee8927 (annotated)

src/cpu/x86/vm/frame_x86.cpp@22cee0ee8927 (annotated)

src/cpu/x86/vm/frame_x86.cpp

Fri, 06 Jan 2012 20:09:20 -0800

author: kvn
date: Fri, 06 Jan 2012 20:09:20 -0800
changeset 3400: 22cee0ee8927
parent 3252: 448691f285a5
child 3433: eaa9557116a2
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1997, 2011, 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 "interpreter/interpreter.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/markOop.hpp"
 #include "oops/methodOop.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/signature.hpp"
 #include "runtime/stubCodeGenerator.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "vmreg_x86.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
 bool frame::safe_for_sender(JavaThread *thread) {
   address   sp = (address)_sp;
   address   fp = (address)_fp;
   address   unextended_sp = (address)_unextended_sp;
   // sp must be within the stack
   bool sp_safe = (sp <= thread->stack_base()) &&
                  (sp >= thread->stack_base() - thread->stack_size());
   if (!sp_safe) {
     return false;
   }
   // unextended sp must be within the stack and above or equal sp
   bool unextended_sp_safe = (unextended_sp <= thread->stack_base()) &&
                             (unextended_sp >= sp);
   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);
   // 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 ) {
     // 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_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
         return false;
       }
     }
     // Entry frame checks
     if (is_entry_frame()) {
       // an entry frame must have a valid fp.
       if (!fp_safe) return false;
       // Validate the JavaCallWrapper an entry frame must have
       address jcw = (address)entry_frame_call_wrapper();
       bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > fp);
       return jcw_safe;
     }
     intptr_t* sender_sp = NULL;
     address   sender_pc = NULL;
     if (is_interpreted_frame()) {
       // fp must be safe
       if (!fp_safe) {
         return false;
       }
       sender_pc = (address) this->fp()[return_addr_offset];
       sender_sp = (intptr_t*) addr_at(sender_sp_offset);
     } else {
       // must be some sort of compiled/runtime frame
       // fp does not have to be safe (although it could be check for c1?)
       sender_sp = _unextended_sp + _cb->frame_size();
       // On Intel the return_address is always the word on the stack
       sender_pc = (address) *(sender_sp-1);
     }
     // We must always be able to find a recognizable pc
     CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
     if (sender_pc == NULL ||  sender_blob == NULL) {
       return false;
     }
     // 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.
       intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
       bool saved_fp_safe = ((address)saved_fp <= thread->stack_base()) && (saved_fp > sender_sp);
       if (!saved_fp_safe) {
         return false;
       }
       // construct the potential sender
       frame sender(sender_sp, saved_fp, sender_pc);
       return sender.is_interpreted_frame_valid(thread);
     }
     // 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)) {
       intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
       bool saved_fp_safe = ((address)saved_fp <= thread->stack_base()) && (saved_fp > sender_sp);
       if (!saved_fp_safe) {
         return false;
       }
       // construct the potential sender
       frame sender(sender_sp, saved_fp, sender_pc);
       // Validate the JavaCallWrapper an entry frame must have
       address jcw = (address)sender.entry_frame_call_wrapper();
       bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > (address)sender.fp());
       return jcw_safe;
     }
     // If the frame size is 0 something 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_nmethod(), "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.
     assert(sender_blob->is_nmethod(), "Impossible call chain");
     // 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) {
   address* pc_addr = &(((address*) sp())[-1]);
   if (TracePcPatching) {
     tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
                   pc_addr, *pc_addr, pc);
   }
   // Either the return address is the original one or we are going to
   // patch in the same address that's already there.
   assert(_pc == *pc_addr || pc == *pc_addr, "must be");
   *pc_addr = pc;
   _cb = CodeCache::find_blob(pc);
   address original_pc = nmethod::get_deopt_original_pc(this);
   if (original_pc != NULL) {
     assert(original_pc == _pc, "expected original PC 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");
   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*) *addr_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");
   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::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.
 #if 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;
     }
   }
 }
 //------------------------------------------------------------------------------
 // frame::update_map_with_saved_link
 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
   // 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.
   map->set_location(rbp->as_VMReg(), (address) link_addr);
 #ifdef AMD64
   // this is weird "H" ought to be at a higher address however the
   // oopMaps seems to have the "H" regs at the same address and the
   // vanilla register.
   // XXXX make this go away
   if (true) {
     map->set_location(rbp->as_VMReg()->next(), (address) link_addr);
   }
 #endif // AMD64
 }
 //------------------------------------------------------------------------------
 // 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();
 #ifdef COMPILER2
   if (map->update_map()) {
     update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
   }
 #endif // COMPILER2
   return frame(sender_sp, unextended_sp, link(), sender_pc());
 }
 //------------------------------------------------------------------------------
 // frame::sender_for_compiled_frame
 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
   assert(map != NULL, "map must be set");
   assert(!is_ricochet_frame(), "caller must handle this");
   // frame owned by optimizing compiler
   assert(_cb->frame_size() >= 0, "must have non-zero frame size");
   intptr_t* sender_sp = unextended_sp() + _cb->frame_size();
   intptr_t* unextended_sp = sender_sp;
   // On Intel the return_address is always the word on the stack
   address sender_pc = (address) *(sender_sp-1);
   // This is the saved value of EBP which may or may not really be an FP.
   // It is only an FP if the sender is an interpreter frame (or C1?).
   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 EBP 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.
     update_map_with_saved_link(map, saved_fp_addr);
   }
   assert(sender_sp != sp(), "must have changed");
   return frame(sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
 }
 //------------------------------------------------------------------------------
 // frame::sender
 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 (is_ricochet_frame())    return sender_for_ricochet_frame(map);
   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");
   methodOop 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;
   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
   methodOop m = *interpreter_frame_method_addr();
   // validate the method we'd find in this potential sender
   if (!Universe::heap()->is_valid_method(m)) return false;
   // stack frames shouldn't be much larger than max_stack elements
   if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
     return false;
   }
   // validate bci/bcx
   intptr_t  bcx    = interpreter_frame_bcx();
   if (m->validate_bci_from_bcx(bcx) < 0) {
     return false;
   }
   // validate constantPoolCacheOop
   constantPoolCacheOop cp = *interpreter_frame_cache_addr();
   if (cp == NULL ||
       !Space::is_aligned(cp) ||
       !Universe::heap()->is_permanent((void*)cp)) 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
   interpreterState istate = get_interpreterState();
 #endif // CC_INTERP
   assert(is_interpreted_frame(), "interpreted frame expected");
   methodOop 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 = (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];
 }
 #ifdef ASSERT
 #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();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/frame_x86.cpp@22cee0ee8927 (annotated)

src/cpu/x86/vm/frame_x86.cpp