jdk8-mips64-public/hotspot: src/cpu/sparc/vm/frame_sparc.cpp@3e8fbc61cee8 (annotated)

src/cpu/sparc/vm/frame_sparc.cpp@3e8fbc61cee8 (annotated)

src/cpu/sparc/vm/frame_sparc.cpp

Wed, 25 Aug 2010 05:27:54 -0700

author: twisti
date: Wed, 25 Aug 2010 05:27:54 -0700
changeset 2103: 3e8fbc61cee8
parent 1934: e9ff18c4ace7
child 2314: f95d63e2154a
permissions: -rw-r--r--

6978355: renaming for 6961697
Summary: This is the renaming part of 6961697 to keep the actual changes small for review.
Reviewed-by: kvn, never

 /*
  * Copyright (c) 1997, 2010, 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 "incls/_precompiled.incl"
 # include "incls/_frame_sparc.cpp.incl"
 void RegisterMap::pd_clear() {
   if (_thread->has_last_Java_frame()) {
     frame fr = _thread->last_frame();
     _window = fr.sp();
   } else {
     _window = NULL;
   }
   _younger_window = NULL;
 }
 // Unified register numbering scheme: each 32-bits counts as a register
 // number, so all the V9 registers take 2 slots.
 const static int R_L_nums[] = {0+040,2+040,4+040,6+040,8+040,10+040,12+040,14+040};
 const static int R_I_nums[] = {0+060,2+060,4+060,6+060,8+060,10+060,12+060,14+060};
 const static int R_O_nums[] = {0+020,2+020,4+020,6+020,8+020,10+020,12+020,14+020};
 const static int R_G_nums[] = {0+000,2+000,4+000,6+000,8+000,10+000,12+000,14+000};
 static RegisterMap::LocationValidType bad_mask = 0;
 static RegisterMap::LocationValidType R_LIO_mask = 0;
 static bool register_map_inited = false;
 static void register_map_init() {
   if (!register_map_inited) {
     register_map_inited = true;
     int i;
     for (i = 0; i < 8; i++) {
       assert(R_L_nums[i] < RegisterMap::location_valid_type_size, "in first chunk");
       assert(R_I_nums[i] < RegisterMap::location_valid_type_size, "in first chunk");
       assert(R_O_nums[i] < RegisterMap::location_valid_type_size, "in first chunk");
       assert(R_G_nums[i] < RegisterMap::location_valid_type_size, "in first chunk");
     }
     bad_mask |= (1LL << R_O_nums[6]); // SP
     bad_mask |= (1LL << R_O_nums[7]); // cPC
     bad_mask |= (1LL << R_I_nums[6]); // FP
     bad_mask |= (1LL << R_I_nums[7]); // rPC
     bad_mask |= (1LL << R_G_nums[2]); // TLS
     bad_mask |= (1LL << R_G_nums[7]); // reserved by libthread
     for (i = 0; i < 8; i++) {
       R_LIO_mask |= (1LL << R_L_nums[i]);
       R_LIO_mask |= (1LL << R_I_nums[i]);
       R_LIO_mask |= (1LL << R_O_nums[i]);
     }
   }
 }
 address RegisterMap::pd_location(VMReg regname) const {
   register_map_init();
   assert(regname->is_reg(), "sanity check");
   // Only the GPRs get handled this way
   if( !regname->is_Register())
     return NULL;
   // don't talk about bad registers
   if ((bad_mask & ((LocationValidType)1 << regname->value())) != 0) {
     return NULL;
   }
   // Convert to a GPR
   Register reg;
   int second_word = 0;
   // 32-bit registers for in, out and local
   if (!regname->is_concrete()) {
     // HMM ought to return NULL for any non-concrete (odd) vmreg
     // this all tied up in the fact we put out double oopMaps for
     // register locations. When that is fixed we'd will return NULL
     // (or assert here).
     reg = regname->prev()->as_Register();
 #ifdef _LP64
     second_word = sizeof(jint);
 #else
     return NULL;
 #endif // _LP64
   } else {
     reg = regname->as_Register();
   }
   if (reg->is_out()) {
     assert(_younger_window != NULL, "Younger window should be available");
     return second_word + (address)&_younger_window[reg->after_save()->sp_offset_in_saved_window()];
   }
   if (reg->is_local() || reg->is_in()) {
     assert(_window != NULL, "Window should be available");
     return second_word + (address)&_window[reg->sp_offset_in_saved_window()];
   }
   // Only the window'd GPRs get handled this way; not the globals.
   return NULL;
 }
 #ifdef ASSERT
 void RegisterMap::check_location_valid() {
   register_map_init();
   assert((_location_valid[0] & bad_mask) == 0, "cannot have special locations for SP,FP,TLS,etc.");
 }
 #endif
 // We are shifting windows.  That means we are moving all %i to %o,
 // getting rid of all current %l, and keeping all %g.  This is only
 // complicated if any of the location pointers for these are valid.
 // The normal case is that everything is in its standard register window
 // home, and _location_valid[0] is zero.  In that case, this routine
 // does exactly nothing.
 void RegisterMap::shift_individual_registers() {
   if (!update_map())  return;  // this only applies to maps with locations
   register_map_init();
   check_location_valid();
   LocationValidType lv = _location_valid[0];
   LocationValidType lv0 = lv;
   lv &= ~R_LIO_mask;  // clear %l, %o, %i regs
   // if we cleared some non-%g locations, we may have to do some shifting
   if (lv != lv0) {
     // copy %i0-%i5 to %o0-%o5, if they have special locations
     // This can happen in within stubs which spill argument registers
     // around a dynamic link operation, such as resolve_opt_virtual_call.
     for (int i = 0; i < 8; i++) {
       if (lv0 & (1LL << R_I_nums[i])) {
         _location[R_O_nums[i]] = _location[R_I_nums[i]];
         lv |=  (1LL << R_O_nums[i]);
       }
     }
   }
   _location_valid[0] = lv;
   check_location_valid();
 }
 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* younger_sp = sp();
     intptr_t* _SENDER_SP = sender_sp(); // sender is actually just _FP
     bool adjusted_stack = is_interpreted_frame();
     address   sender_pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset;
     // 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;
     }
     // It should be safe to construct the sender though it might not be valid
     frame sender(_SENDER_SP, younger_sp, adjusted_stack);
     // Do we have a valid fp?
     address sender_fp = (address) sender.fp();
     // an fp must be within the stack and above (but not equal) current frame's _FP
     bool sender_fp_safe = (sender_fp <= thread->stack_base()) &&
                    (sender_fp > _FP);
     if (!sender_fp_safe) {
       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()) {
       // Validate the JavaCallWrapper an entry frame must have
       address jcw = (address)sender.entry_frame_call_wrapper();
       bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > sender_fp);
       return jcw_safe;
     }
     // If the frame size is 0 something is bad because every nmethod has a non-zero frame size
     // because you must allocate window space
     if (sender_blob->frame_size() == 0) {
       assert(!sender_blob->is_nmethod(), "should count return address at least");
       return false;
     }
     // The sender should positively be an nmethod or call_stub. On sparc we might in fact see something else.
     // The cause of this is because at a save instruction the O7 we get is a leftover from an earlier
     // window use. So if a runtime stub creates two frames (common in fastdebug/jvmg) then we see the
     // stale pc. So if the sender blob is not something we'd expect we have little choice but to declare
     // the stack unwalkable. pd_get_top_frame_for_signal_handler tries to recover from this by unwinding
     // that initial frame and retrying.
     if (!sender_blob->is_nmethod()) {
       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;
   // could try and do some more potential verification of native frame if we could think of some...
   return true;
 }
 // constructors
 // Construct an unpatchable, deficient frame
 frame::frame(intptr_t* sp, unpatchable_t, address pc, CodeBlob* cb) {
 #ifdef _LP64
   assert( (((intptr_t)sp & (wordSize-1)) == 0), "frame constructor passed an invalid sp");
 #endif
   _sp = sp;
   _younger_sp = NULL;
   _pc = pc;
   _cb = cb;
   _sp_adjustment_by_callee = 0;
   assert(pc == NULL && cb == NULL || pc != NULL, "can't have a cb and no pc!");
   if (_cb == NULL && _pc != NULL ) {
     _cb = CodeCache::find_blob(_pc);
   }
   _deopt_state = unknown;
 #ifdef ASSERT
   if ( _cb != NULL && _cb->is_nmethod()) {
     // Without a valid unextended_sp() we can't convert the pc to "original"
     assert(!((nmethod*)_cb)->is_deopt_pc(_pc), "invariant broken");
   }
 #endif // ASSERT
 }
 frame::frame(intptr_t* sp, intptr_t* younger_sp, bool younger_frame_is_interpreted) :
   _sp(sp),
   _younger_sp(younger_sp),
   _deopt_state(unknown),
   _sp_adjustment_by_callee(0) {
   if (younger_sp == NULL) {
     // make a deficient frame which doesn't know where its PC is
     _pc = NULL;
     _cb = NULL;
   } else {
     _pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset;
     assert( (intptr_t*)younger_sp[FP->sp_offset_in_saved_window()] == (intptr_t*)((intptr_t)sp - STACK_BIAS), "younger_sp must be valid");
     // Any frame we ever build should always "safe" therefore we should not have to call
     // find_blob_unsafe
     // In case of native stubs, the pc retrieved here might be
     // wrong.  (the _last_native_pc will have the right value)
     // So do not put add any asserts on the _pc here.
   }
   if (_pc != NULL)
     _cb = CodeCache::find_blob(_pc);
   // Check for MethodHandle call sites.
   if (_cb != NULL) {
     nmethod* nm = _cb->as_nmethod_or_null();
     if (nm != NULL) {
       if (nm->is_deopt_mh_entry(_pc) || nm->is_method_handle_return(_pc)) {
         _sp_adjustment_by_callee = (intptr_t*) ((intptr_t) sp[L7_mh_SP_save->sp_offset_in_saved_window()] + STACK_BIAS) - sp;
         // The SP is already adjusted by this MH call site, don't
         // overwrite this value with the wrong interpreter value.
         younger_frame_is_interpreted = false;
       }
     }
   }
   if (younger_frame_is_interpreted) {
     // compute adjustment to this frame's SP made by its interpreted callee
     _sp_adjustment_by_callee = (intptr_t*) ((intptr_t) younger_sp[I5_savedSP->sp_offset_in_saved_window()] + STACK_BIAS) - sp;
   }
   // It is important that the frame is fully constructed when we do
   // this lookup as get_deopt_original_pc() needs a correct value for
   // unextended_sp() which uses _sp_adjustment_by_callee.
   if (_pc != NULL) {
     address original_pc = nmethod::get_deopt_original_pc(this);
     if (original_pc != NULL) {
       _pc = original_pc;
       _deopt_state = is_deoptimized;
     } else {
       _deopt_state = not_deoptimized;
     }
   }
 }
 bool frame::is_interpreted_frame() const  {
   return Interpreter::contains(pc());
 }
 // sender_sp
 intptr_t* frame::interpreter_frame_sender_sp() const {
   assert(is_interpreted_frame(), "interpreted frame expected");
   return fp();
 }
 #ifndef CC_INTERP
 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
   assert(is_interpreted_frame(), "interpreted frame expected");
   Unimplemented();
 }
 #endif // CC_INTERP
 #ifdef ASSERT
 // Debugging aid
 static frame nth_sender(int n) {
   frame f = JavaThread::current()->last_frame();
   for(int i = 0; i < n; ++i)
     f = f.sender((RegisterMap*)NULL);
   printf("first frame %d\n",          f.is_first_frame()       ? 1 : 0);
   printf("interpreted frame %d\n",    f.is_interpreted_frame() ? 1 : 0);
   printf("java frame %d\n",           f.is_java_frame()        ? 1 : 0);
   printf("entry frame %d\n",          f.is_entry_frame()       ? 1 : 0);
   printf("native frame %d\n",         f.is_native_frame()      ? 1 : 0);
   if (f.is_compiled_frame()) {
     if (f.is_deoptimized_frame())
       printf("deoptimized frame 1\n");
     else
       printf("compiled frame 1\n");
   }
   return f;
 }
 #endif
 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");
   intptr_t* last_Java_sp = jfa->last_Java_sp();
   // Since we are walking the stack now this nested anchor is obviously walkable
   // even if it wasn't when it was stacked.
   if (!jfa->walkable()) {
     // Capture _last_Java_pc (if needed) and mark anchor walkable.
     jfa->capture_last_Java_pc(_sp);
   }
   assert(jfa->last_Java_pc() != NULL, "No captured pc!");
   map->clear();
   map->make_integer_regs_unsaved();
   map->shift_window(last_Java_sp, NULL);
   assert(map->include_argument_oops(), "should be set by clear");
   return frame(last_Java_sp, frame::unpatchable, jfa->last_Java_pc());
 }
 frame frame::sender_for_interpreter_frame(RegisterMap *map) const {
   ShouldNotCallThis();
   return sender(map);
 }
 frame frame::sender_for_compiled_frame(RegisterMap *map) const {
   ShouldNotCallThis();
   return sender(map);
 }
 frame frame::sender(RegisterMap* map) const {
   assert(map != NULL, "map must be set");
   assert(CodeCache::find_blob_unsafe(_pc) == _cb, "inconsistent");
   // Default is not to follow arguments; update it accordingly below
   map->set_include_argument_oops(false);
   if (is_entry_frame()) return sender_for_entry_frame(map);
   intptr_t* younger_sp = sp();
   intptr_t* sp         = sender_sp();
   // Note:  The version of this operation on any platform with callee-save
   //        registers must update the register map (if not null).
   //        In order to do this correctly, the various subtypes of
   //        of frame (interpreted, compiled, glue, native),
   //        must be distinguished.  There is no need on SPARC for
   //        such distinctions, because all callee-save registers are
   //        preserved for all frames via SPARC-specific mechanisms.
   //
   //        *** HOWEVER, *** if and when we make any floating-point
   //        registers callee-saved, then we will have to copy over
   //        the RegisterMap update logic from the Intel code.
   // The constructor of the sender must know whether this frame is interpreted so it can set the
   // sender's _sp_adjustment_by_callee field.  An osr adapter frame was originally
   // interpreted but its pc is in the code cache (for c1 -> osr_frame_return_id stub), so it must be
   // explicitly recognized.
   bool frame_is_interpreted = is_interpreted_frame();
   if (frame_is_interpreted) {
     map->make_integer_regs_unsaved();
     map->shift_window(sp, younger_sp);
   } else if (_cb != NULL) {
     // Update the locations of implicitly saved registers to be their
     // addresses in the register save area.
     // For %o registers, the addresses of %i registers in the next younger
     // frame are used.
     map->shift_window(sp, younger_sp);
     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);
       }
     }
   }
   return frame(sp, younger_sp, frame_is_interpreted);
 }
 void frame::patch_pc(Thread* thread, address pc) {
   if(thread == Thread::current()) {
    StubRoutines::Sparc::flush_callers_register_windows_func()();
   }
   if (TracePcPatching) {
     // QQQ this assert is invalid (or too strong anyway) sice _pc could
     // be original pc and frame could have the deopt pc.
     // assert(_pc == *O7_addr() + pc_return_offset, "frame has wrong pc");
     tty->print_cr("patch_pc at address  0x%x [0x%x -> 0x%x] ", O7_addr(), _pc, pc);
   }
   _cb = CodeCache::find_blob(pc);
   *O7_addr() = pc - pc_return_offset;
   _cb = CodeCache::find_blob(_pc);
   address original_pc = nmethod::get_deopt_original_pc(this);
   if (original_pc != NULL) {
     assert(original_pc == _pc, "expected original to be stored before patching");
     _deopt_state = is_deoptimized;
   } else {
     _deopt_state = not_deoptimized;
   }
 }
 static bool sp_is_valid(intptr_t* old_sp, intptr_t* young_sp, intptr_t* sp) {
   return (((intptr_t)sp & (2*wordSize-1)) == 0 &&
           sp <= old_sp &&
           sp >= young_sp);
 }
 /*
   Find the (biased) sp that is just younger than old_sp starting at sp.
   If not found return NULL. Register windows are assumed to be flushed.
 */
 intptr_t* frame::next_younger_sp_or_null(intptr_t* old_sp, intptr_t* sp) {
   intptr_t* previous_sp = NULL;
   intptr_t* orig_sp = sp;
   int max_frames = (old_sp - sp) / 16; // Minimum frame size is 16
   int max_frame2 = max_frames;
   while(sp != old_sp && sp_is_valid(old_sp, orig_sp, sp)) {
     if (max_frames-- <= 0)
       // too many frames have gone by; invalid parameters given to this function
       break;
     previous_sp = sp;
     sp = (intptr_t*)sp[FP->sp_offset_in_saved_window()];
     sp = (intptr_t*)((intptr_t)sp + STACK_BIAS);
   }
   return (sp == old_sp ? previous_sp : NULL);
 }
 /*
   Determine if "sp" is a valid stack pointer. "sp" is assumed to be younger than
   "valid_sp". So if "sp" is valid itself then it should be possible to walk frames
   from "sp" to "valid_sp". The assumption is that the registers windows for the
   thread stack in question are flushed.
 */
 bool frame::is_valid_stack_pointer(intptr_t* valid_sp, intptr_t* sp) {
   return next_younger_sp_or_null(valid_sp, sp) != NULL;
 }
 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) {
   assert(is_interpreted_frame(), "must be interpreter frame");
   return this->fp() == fp;
 }
 void frame::pd_gc_epilog() {
   if (is_interpreted_frame()) {
     // set constant pool cache entry for interpreter
     methodOop m = interpreter_frame_method();
     *interpreter_frame_cpoolcache_addr() = m->constants()->cache();
   }
 }
 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
 #ifdef CC_INTERP
   // Is there anything to do?
 #else
   assert(is_interpreted_frame(), "Not an interpreted frame");
   // These are reasonable sanity checks
   if (fp() == 0 || (intptr_t(fp()) & (2*wordSize-1)) != 0) {
     return false;
   }
   if (sp() == 0 || (intptr_t(sp()) & (2*wordSize-1)) != 0) {
     return false;
   }
   const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words;
   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;
 }
 // Windows have been flushed on entry (but not marked). Capture the pc that
 // is the return address to the frame that contains "sp" as its stack pointer.
 // This pc resides in the called of the frame corresponding to "sp".
 // As a side effect we mark this JavaFrameAnchor as having flushed the windows.
 // This side effect lets us mark stacked JavaFrameAnchors (stacked in the
 // call_helper) as flushed when we have flushed the windows for the most
 // recent (i.e. current) JavaFrameAnchor. This saves useless flushing calls
 // and lets us find the pc just once rather than multiple times as it did
 // in the bad old _post_Java_state days.
 //
 void JavaFrameAnchor::capture_last_Java_pc(intptr_t* sp) {
   if (last_Java_sp() != NULL && last_Java_pc() == NULL) {
     // try and find the sp just younger than _last_Java_sp
     intptr_t* _post_Java_sp = frame::next_younger_sp_or_null(last_Java_sp(), sp);
     // Really this should never fail otherwise VM call must have non-standard
     // frame linkage (bad) or stack is not properly flushed (worse).
     guarantee(_post_Java_sp != NULL, "bad stack!");
     _last_Java_pc = (address) _post_Java_sp[ I7->sp_offset_in_saved_window()] + frame::pc_return_offset;
   }
   set_window_flushed();
 }
 void JavaFrameAnchor::make_walkable(JavaThread* thread) {
   if (walkable()) return;
   // Eventually make an assert
   guarantee(Thread::current() == (Thread*)thread, "only current thread can flush its registers");
   // We always flush in case the profiler wants it but we won't mark
   // the windows as flushed unless we have a last_Java_frame
   intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
   if (last_Java_sp() != NULL ) {
     capture_last_Java_pc(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);
   intptr_t* LSP = (intptr_t*) sp()[Lentry_args->sp_offset_in_saved_window()];
   return &LSP[index+1];
 }
 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
   assert(is_interpreted_frame(), "interpreted frame expected");
   methodOop method = interpreter_frame_method();
   BasicType type = method->result_type();
   if (method->is_native()) {
     // Prior to notifying the runtime of the method_exit the possible result
     // value is saved to l_scratch and d_scratch.
 #ifdef CC_INTERP
     interpreterState istate = get_interpreterState();
     intptr_t* l_scratch = (intptr_t*) &istate->_native_lresult;
     intptr_t* d_scratch = (intptr_t*) &istate->_native_fresult;
 #else /* CC_INTERP */
     intptr_t* l_scratch = fp() + interpreter_frame_l_scratch_fp_offset;
     intptr_t* d_scratch = fp() + interpreter_frame_d_scratch_fp_offset;
 #endif /* CC_INTERP */
     address l_addr = (address)l_scratch;
 #ifdef _LP64
     // On 64-bit the result for 1/8/16/32-bit result types is in the other
     // word half
     l_addr += wordSize/2;
 #endif
     switch (type) {
       case T_OBJECT:
       case T_ARRAY: {
 #ifdef CC_INTERP
         *oop_result = istate->_oop_temp;
 #else
         oop obj = (oop) at(interpreter_frame_oop_temp_offset);
         assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
         *oop_result = obj;
 #endif // CC_INTERP
         break;
       }
       case T_BOOLEAN : { jint* p = (jint*)l_addr; value_result->z = (jboolean)((*p) & 0x1); break; }
       case T_BYTE    : { jint* p = (jint*)l_addr; value_result->b = (jbyte)((*p) & 0xff); break; }
       case T_CHAR    : { jint* p = (jint*)l_addr; value_result->c = (jchar)((*p) & 0xffff); break; }
       case T_SHORT   : { jint* p = (jint*)l_addr; value_result->s = (jshort)((*p) & 0xffff); break; }
       case T_INT     : value_result->i = *(jint*)l_addr; break;
       case T_LONG    : value_result->j = *(jlong*)l_scratch; break;
       case T_FLOAT   : value_result->f = *(jfloat*)d_scratch; break;
       case T_DOUBLE  : value_result->d = *(jdouble*)d_scratch; break;
       case T_VOID    : /* Nothing to do */ break;
       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 : { jint* p = (jint*)tos_addr; value_result->z = (jboolean)((*p) & 0x1); break; }
       case T_BYTE    : { jint* p = (jint*)tos_addr; value_result->b = (jbyte)((*p) & 0xff); break; }
       case T_CHAR    : { jint* p = (jint*)tos_addr; value_result->c = (jchar)((*p) & 0xffff); break; }
       case T_SHORT   : { jint* p = (jint*)tos_addr; value_result->s = (jshort)((*p) & 0xffff); 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    : /* Nothing to do */ break;
       default        : ShouldNotReachHere();
     }
   };
   return type;
 }
 // Lesp pointer is one word lower than the top item on the stack.
 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
   int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize) - 1;
   return &interpreter_frame_tos_address()[index];
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/frame_sparc.cpp@3e8fbc61cee8 (annotated)

src/cpu/sparc/vm/frame_sparc.cpp