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src/hotspot/share/runtime/stackValue.cpp

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  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "code/debugInfo.hpp"
  27 #include "oops/compressedOops.inline.hpp"
  28 #include "oops/oop.hpp"
  29 #include "runtime/frame.inline.hpp"
  30 #include "runtime/handles.inline.hpp"
  31 #include "runtime/stackValue.hpp"
  32 #if INCLUDE_ZGC
  33 #include "gc/z/zBarrier.inline.hpp"
  34 #endif



  35 
  36 StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv) {
  37   if (sv->is_location()) {
  38     // Stack or register value
  39     Location loc = ((LocationValue *)sv)->location();
  40 
  41 #ifdef SPARC
  42     // %%%%% Callee-save floats will NOT be working on a Sparc until we
  43     // handle the case of a 2 floats in a single double register.
  44     assert( !(loc.is_register() && loc.type() == Location::float_in_dbl), "Sparc does not handle callee-save floats yet" );
  45 #endif // SPARC
  46 
  47     // First find address of value
  48 
  49     address value_addr = loc.is_register()
  50       // Value was in a callee-save register
  51       ? reg_map->location(VMRegImpl::as_VMReg(loc.register_number()))
  52       // Else value was directly saved on the stack. The frame's original stack pointer,
  53       // before any extension by its callee (due to Compiler1 linkage on SPARC), must be used.
  54       : ((address)fr->unextended_sp()) + loc.stack_offset();


  89     }
  90 #ifdef _LP64
  91     case Location::dbl:
  92       // Double value in an aligned adjacent pair
  93       return new StackValue(*(intptr_t*)value_addr);
  94     case Location::lng:
  95       // Long   value in an aligned adjacent pair
  96       return new StackValue(*(intptr_t*)value_addr);
  97     case Location::narrowoop: {
  98       union { intptr_t p; narrowOop noop;} value;
  99       value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
 100       if (loc.is_register()) {
 101         // The callee has no clue whether the register holds an int,
 102         // long or is unused.  He always saves a long.  Here we know
 103         // a long was saved, but we only want an int back.  Narrow the
 104         // saved long to the int that the JVM wants.
 105         value.noop =  (narrowOop) *(julong*) value_addr;
 106       } else {
 107         value.noop = *(narrowOop*) value_addr;
 108       }
 109       // Decode narrowoop and wrap a handle around the oop
 110       Handle h(Thread::current(), CompressedOops::decode(value.noop));







 111       return new StackValue(h);
 112     }
 113 #endif
 114     case Location::oop: {
 115       oop val = *(oop *)value_addr;
 116 #ifdef _LP64
 117       if (Universe::is_narrow_oop_base(val)) {
 118          // Compiled code may produce decoded oop = narrow_oop_base
 119          // when a narrow oop implicit null check is used.
 120          // The narrow_oop_base could be NULL or be the address
 121          // of the page below heap. Use NULL value for both cases.
 122          val = (oop)NULL;
 123       }
 124 #endif

 125 #if INCLUDE_ZGC
 126       // Deoptimization must make sure all oop have passed load barrier
 127       if (UseZGC) {
 128         val = ZBarrier::load_barrier_on_oop_field_preloaded((oop*)value_addr, val);
 129       }
 130 #endif
 131 




 132       Handle h(Thread::current(), val); // Wrap a handle around the oop
 133       return new StackValue(h);
 134     }
 135     case Location::addr: {
 136       ShouldNotReachHere(); // both C1 and C2 now inline jsrs
 137     }
 138     case Location::normal: {
 139       // Just copy all other bits straight through
 140       union { intptr_t p; jint ji;} value;
 141       value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
 142       value.ji = *(jint*)value_addr;
 143       return new StackValue(value.p);
 144     }
 145     case Location::invalid:
 146       return new StackValue();
 147     default:
 148       ShouldNotReachHere();
 149     }
 150 
 151   } else if (sv->is_constant_int()) {




  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "code/debugInfo.hpp"
  27 #include "oops/compressedOops.inline.hpp"
  28 #include "oops/oop.hpp"
  29 #include "runtime/frame.inline.hpp"
  30 #include "runtime/handles.inline.hpp"
  31 #include "runtime/stackValue.hpp"
  32 #if INCLUDE_ZGC
  33 #include "gc/z/zBarrier.inline.hpp"
  34 #endif
  35 #if INCLUDE_SHENANDOAHGC
  36 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
  37 #endif
  38 
  39 StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv) {
  40   if (sv->is_location()) {
  41     // Stack or register value
  42     Location loc = ((LocationValue *)sv)->location();
  43 
  44 #ifdef SPARC
  45     // %%%%% Callee-save floats will NOT be working on a Sparc until we
  46     // handle the case of a 2 floats in a single double register.
  47     assert( !(loc.is_register() && loc.type() == Location::float_in_dbl), "Sparc does not handle callee-save floats yet" );
  48 #endif // SPARC
  49 
  50     // First find address of value
  51 
  52     address value_addr = loc.is_register()
  53       // Value was in a callee-save register
  54       ? reg_map->location(VMRegImpl::as_VMReg(loc.register_number()))
  55       // Else value was directly saved on the stack. The frame's original stack pointer,
  56       // before any extension by its callee (due to Compiler1 linkage on SPARC), must be used.
  57       : ((address)fr->unextended_sp()) + loc.stack_offset();


  92     }
  93 #ifdef _LP64
  94     case Location::dbl:
  95       // Double value in an aligned adjacent pair
  96       return new StackValue(*(intptr_t*)value_addr);
  97     case Location::lng:
  98       // Long   value in an aligned adjacent pair
  99       return new StackValue(*(intptr_t*)value_addr);
 100     case Location::narrowoop: {
 101       union { intptr_t p; narrowOop noop;} value;
 102       value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
 103       if (loc.is_register()) {
 104         // The callee has no clue whether the register holds an int,
 105         // long or is unused.  He always saves a long.  Here we know
 106         // a long was saved, but we only want an int back.  Narrow the
 107         // saved long to the int that the JVM wants.
 108         value.noop =  (narrowOop) *(julong*) value_addr;
 109       } else {
 110         value.noop = *(narrowOop*) value_addr;
 111       }
 112       // Decode narrowoop
 113       oop val = CompressedOops::decode(value.noop);
 114       // Deoptimization must make sure all oops have passed load barriers
 115 #if INCLUDE_SHENANDOAHGC
 116       if (UseShenandoahGC) {
 117         val = ShenandoahBarrierSet::barrier_set()->load_reference_barrier(val);
 118       }
 119 #endif
 120       Handle h(Thread::current(), val); // Wrap a handle around the oop
 121       return new StackValue(h);
 122     }
 123 #endif
 124     case Location::oop: {
 125       oop val = *(oop *)value_addr;
 126 #ifdef _LP64
 127       if (Universe::is_narrow_oop_base(val)) {
 128          // Compiled code may produce decoded oop = narrow_oop_base
 129          // when a narrow oop implicit null check is used.
 130          // The narrow_oop_base could be NULL or be the address
 131          // of the page below heap. Use NULL value for both cases.
 132          val = (oop)NULL;
 133       }
 134 #endif
 135       // Deoptimization must make sure all oops have passed load barriers
 136 #if INCLUDE_ZGC

 137       if (UseZGC) {
 138         val = ZBarrier::load_barrier_on_oop_field_preloaded((oop*)value_addr, val);
 139       }
 140 #endif
 141 #if INCLUDE_SHENANDOAHGC
 142       if (UseShenandoahGC) {
 143         val = ShenandoahBarrierSet::barrier_set()->load_reference_barrier(val);
 144       }
 145 #endif
 146       Handle h(Thread::current(), val); // Wrap a handle around the oop
 147       return new StackValue(h);
 148     }
 149     case Location::addr: {
 150       ShouldNotReachHere(); // both C1 and C2 now inline jsrs
 151     }
 152     case Location::normal: {
 153       // Just copy all other bits straight through
 154       union { intptr_t p; jint ji;} value;
 155       value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
 156       value.ji = *(jint*)value_addr;
 157       return new StackValue(value.p);
 158     }
 159     case Location::invalid:
 160       return new StackValue();
 161     default:
 162       ShouldNotReachHere();
 163     }
 164 
 165   } else if (sv->is_constant_int()) {


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