13  * accompanied this code).
  14  *
  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 "memory/allocation.inline.hpp"
  27 #include "opto/block.hpp"
  28 #include "opto/c2compiler.hpp"
  29 #include "opto/callnode.hpp"
  30 #include "opto/cfgnode.hpp"
  31 #include "opto/machnode.hpp"
  32 #include "opto/runtime.hpp"
  33 #ifdef TARGET_ARCH_MODEL_x86_32


  34 # include "adfiles/ad_x86_32.hpp"
  35 #endif
  36 #ifdef TARGET_ARCH_MODEL_x86_64
  37 # include "adfiles/ad_x86_64.hpp"
  38 #endif
  39 #ifdef TARGET_ARCH_MODEL_sparc
  40 # include "adfiles/ad_sparc.hpp"
  41 #endif
  42 #ifdef TARGET_ARCH_MODEL_zero
  43 # include "adfiles/ad_zero.hpp"
  44 #endif
  45 #ifdef TARGET_ARCH_MODEL_arm
  46 # include "adfiles/ad_arm.hpp"
  47 #endif
  48 #ifdef TARGET_ARCH_MODEL_ppc_32
  49 # include "adfiles/ad_ppc_32.hpp"
  50 #endif
  51 #ifdef TARGET_ARCH_MODEL_ppc_64
  52 # include "adfiles/ad_ppc_64.hpp"
  53 #endif
  54 
  55 // Optimization - Graph Style
  56 
  57 // Check whether val is not-null-decoded compressed oop,
  58 // i.e. will grab into the base of the heap if it represents NULL.
  59 static bool accesses_heap_base_zone(Node *val) {
  60   if (Universe::narrow_oop_base() > 0) { // Implies UseCompressedOops.
  61     if (val && val->is_Mach()) {
  62       if (val->as_Mach()->ideal_Opcode() == Op_DecodeN) {
  63         // This assumes all Decodes with TypePtr::NotNull are matched to nodes that
  64         // decode NULL to point to the heap base (Decode_NN).
  65         if (val->bottom_type()->is_oopptr()->ptr() == TypePtr::NotNull) {
  66           return true;
  67         }
  68       }
  69       // Must recognize load operation with Decode matched in memory operand.
  70       // We should not reach here exept for PPC/AIX, as os::zero_page_read_protected()
  71       // returns true everywhere else. On PPC, no such memory operands

  13  * accompanied this code).
  14  *
  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 "memory/allocation.inline.hpp"
  27 #include "opto/block.hpp"
  28 #include "opto/c2compiler.hpp"
  29 #include "opto/callnode.hpp"
  30 #include "opto/cfgnode.hpp"
  31 #include "opto/machnode.hpp"
  32 #include "opto/runtime.hpp"
  33 #if defined AD_MD_HPP
  34 # include AD_MD_HPP
  35 #elif defined TARGET_ARCH_MODEL_x86_32
  36 # include "adfiles/ad_x86_32.hpp"
  37 #elif defined TARGET_ARCH_MODEL_x86_64

  38 # include "adfiles/ad_x86_64.hpp"
  39 #elif defined TARGET_ARCH_MODEL_sparc

  40 # include "adfiles/ad_sparc.hpp"
  41 #elif defined TARGET_ARCH_MODEL_zero

  42 # include "adfiles/ad_zero.hpp"
  43 #elif defined TARGET_ARCH_MODEL_ppc_64







  44 # include "adfiles/ad_ppc_64.hpp"
  45 #endif
  46 
  47 // Optimization - Graph Style
  48 
  49 // Check whether val is not-null-decoded compressed oop,
  50 // i.e. will grab into the base of the heap if it represents NULL.
  51 static bool accesses_heap_base_zone(Node *val) {
  52   if (Universe::narrow_oop_base() > 0) { // Implies UseCompressedOops.
  53     if (val && val->is_Mach()) {
  54       if (val->as_Mach()->ideal_Opcode() == Op_DecodeN) {
  55         // This assumes all Decodes with TypePtr::NotNull are matched to nodes that
  56         // decode NULL to point to the heap base (Decode_NN).
  57         if (val->bottom_type()->is_oopptr()->ptr() == TypePtr::NotNull) {
  58           return true;
  59         }
  60       }
  61       // Must recognize load operation with Decode matched in memory operand.
  62       // We should not reach here exept for PPC/AIX, as os::zero_page_read_protected()
  63       // returns true everywhere else. On PPC, no such memory operands