< prev index next >

src/java.base/share/classes/java/lang/StackFrameInfo.java

Print this page




  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang;
  26 
  27 import jdk.internal.access.JavaLangInvokeAccess;
  28 import jdk.internal.access.SharedSecrets;
  29 
  30 import java.lang.StackWalker.StackFrame;
  31 import java.lang.invoke.MethodType;

  32 
  33 class StackFrameInfo implements StackFrame {
  34     private final byte RETAIN_CLASS_REF = 0x01;
  35 
  36     private final static JavaLangInvokeAccess JLIA =
  37         SharedSecrets.getJavaLangInvokeAccess();
  38 
  39     private final byte flags;
  40     private final Object memberName;
  41     private final short bci;


  42     private volatile StackTraceElement ste;
  43 
  44     /*
  45      * Create StackFrameInfo for StackFrameTraverser and LiveStackFrameTraverser
  46      * to use
  47      */
  48     StackFrameInfo(StackWalker walker) {
  49         this.flags = walker.retainClassRef ? RETAIN_CLASS_REF : 0;
  50         this.bci = -1;
  51         this.memberName = JLIA.newMemberName();
  52     }
  53 
  54     // package-private called by StackStreamFactory to skip
  55     // the capability check
  56     Class<?> declaringClass() {
  57         return JLIA.getDeclaringClass(memberName);
  58     }
  59 















  60     // ----- implementation of StackFrame methods
  61 
  62     @Override
  63     public String getClassName() {
  64         return declaringClass().getName();
  65     }
  66 
  67     @Override
  68     public Class<?> getDeclaringClass() {
  69         ensureRetainClassRefEnabled();
  70         return declaringClass();
  71     }
  72 
  73     @Override
  74     public String getMethodName() {
  75         return JLIA.getName(memberName);
  76     }
  77 
  78     @Override
  79     public MethodType getMethodType() {


  96     }
  97 
  98     @Override
  99     public String getFileName() {
 100         return toStackTraceElement().getFileName();
 101     }
 102 
 103     @Override
 104     public int getLineNumber() {
 105         // line number not available for native methods
 106         if (isNativeMethod())
 107             return -2;
 108 
 109         return toStackTraceElement().getLineNumber();
 110     }
 111 
 112 
 113     @Override
 114     public boolean isNativeMethod() {
 115         return JLIA.isNative(memberName);





 116     }
 117 
 118     @Override
 119     public String toString() {
 120         return toStackTraceElement().toString();
 121     }
 122 
 123     @Override
 124     public StackTraceElement toStackTraceElement() {
 125         StackTraceElement s = ste;
 126         if (s == null) {
 127             synchronized (this) {
 128                 s = ste;
 129                 if (s == null) {
 130                     ste = s = StackTraceElement.of(this);
 131                 }
 132             }
 133         }
 134         return s;
 135     }


  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang;
  26 
  27 import jdk.internal.access.JavaLangInvokeAccess;
  28 import jdk.internal.access.SharedSecrets;
  29 
  30 import java.lang.StackWalker.StackFrame;
  31 import java.lang.invoke.MethodType;
  32 import java.lang.reflect.Method;
  33 
  34 class StackFrameInfo implements StackFrame {
  35     private final byte RETAIN_CLASS_REF = 0x01;
  36 
  37     private final static JavaLangInvokeAccess JLIA =
  38         SharedSecrets.getJavaLangInvokeAccess();
  39 
  40     private final byte flags;
  41     private Object memberName;
  42     private short bci;
  43     private ContinuationScope contScope;
  44 
  45     private volatile StackTraceElement ste;
  46 
  47     /*
  48      * Create StackFrameInfo for StackFrameTraverser and LiveStackFrameTraverser
  49      * to use
  50      */
  51     StackFrameInfo(StackWalker walker) {
  52         this.flags = walker.retainClassRef ? RETAIN_CLASS_REF : 0;
  53         this.bci = -1;
  54         this.memberName = JLIA.newMemberName();
  55     }
  56 
  57     // package-private called by StackStreamFactory to skip
  58     // the capability check
  59     Class<?> declaringClass() {
  60         return JLIA.getDeclaringClass(memberName);
  61     }
  62 
  63     void setMemberName(Method method) {
  64         this.memberName = JLIA.newMemberName(method);
  65     }
  66 
  67     void setBCI(short bci) {
  68         this.bci = bci;
  69     }
  70 
  71     void setContinuationScope(ContinuationScope contScope) {
  72         this.contScope = contScope;
  73     }
  74     
  75     protected void clear() {
  76     }
  77 
  78     // ----- implementation of StackFrame methods
  79 
  80     @Override
  81     public String getClassName() {
  82         return declaringClass().getName();
  83     }
  84 
  85     @Override
  86     public Class<?> getDeclaringClass() {
  87         ensureRetainClassRefEnabled();
  88         return declaringClass();
  89     }
  90 
  91     @Override
  92     public String getMethodName() {
  93         return JLIA.getName(memberName);
  94     }
  95 
  96     @Override
  97     public MethodType getMethodType() {


 114     }
 115 
 116     @Override
 117     public String getFileName() {
 118         return toStackTraceElement().getFileName();
 119     }
 120 
 121     @Override
 122     public int getLineNumber() {
 123         // line number not available for native methods
 124         if (isNativeMethod())
 125             return -2;
 126 
 127         return toStackTraceElement().getLineNumber();
 128     }
 129 
 130 
 131     @Override
 132     public boolean isNativeMethod() {
 133         return JLIA.isNative(memberName);
 134     }
 135 
 136     @Override
 137     public java.lang.String getContinuationScopeName() {
 138         return contScope.getName();
 139     }
 140 
 141     @Override
 142     public String toString() {
 143         return toStackTraceElement().toString();
 144     }
 145 
 146     @Override
 147     public StackTraceElement toStackTraceElement() {
 148         StackTraceElement s = ste;
 149         if (s == null) {
 150             synchronized (this) {
 151                 s = ste;
 152                 if (s == null) {
 153                     ste = s = StackTraceElement.of(this);
 154                 }
 155             }
 156         }
 157         return s;
 158     }
< prev index next >