2 files changed, 53 insertions, 0 deletions

diff --git a/libjava/gnu/gcj/runtime/NameFinder.java b/libjava/gnu/gcj/runtime/NameFinder.java
index 4089411..19820c1 100644
--- a/libjava/gnu/gcj/runtime/NameFinder.java
+++ b/libjava/gnu/gcj/runtime/NameFinder.java
@@ -103,6 +103,11 @@ public class NameFinder
   private BufferedReader addr2lineIn;
 
   /**
+   * Flag set if using addr2name.awk instead of addr2line from binutils.
+   */
+  private boolean usingAddr2name = false;
+
+  /**
    * Creates a new NameFinder. Call close to get rid of any resources
    * created while using the <code>lookup</code> methods.
    */
@@ -142,6 +147,7 @@ public class NameFinder
 	      {
 		String[] exec = new String[] {"addr2name.awk", executable};
 		addr2line = runtime.exec(exec);
+		usingAddr2name = true;
 	      }
 	    catch (IOException ioe2) { addr2line = null; }
 	  }
@@ -181,6 +187,11 @@ public class NameFinder
   native private String getAddrAsString(RawData addrs, int n);
 
   /**
+   * Returns the label that is exported for the given method name.
+   */
+  native private String getExternalLabel(String name);
+
+  /**
    * If nth element of stack is an interpreted frame, return the
    * element representing the method being interpreted.
    */
@@ -212,6 +223,15 @@ public class NameFinder
 		addr2lineOut.flush();
 		name = addr2lineIn.readLine();
 		file = addr2lineIn.readLine();
+
+                // addr2line uses symbolic debugging information instead
+                // of the actually exported labels as addr2name.awk does.
+                // This name might need some modification, depending on 
+                // the system, to make it a label like that returned 
+                // by addr2name.awk or dladdr.
+                if (! usingAddr2name)
+                  if (name != null && ! "??".equals (name))
+                    name = getExternalLabel (name);
 	      }
 	    catch (IOException ioe) { addr2line = null; }
 	  }
diff --git a/libjava/gnu/gcj/runtime/natNameFinder.cc b/libjava/gnu/gcj/runtime/natNameFinder.cc
index 29687cb..6605e38 100644
--- a/libjava/gnu/gcj/runtime/natNameFinder.cc
+++ b/libjava/gnu/gcj/runtime/natNameFinder.cc
@@ -15,6 +15,8 @@ details.  */
 
 #include <config.h>
 
+#include <string.h>
+
 #include <gcj/cni.h>
 #include <jvm.h>
 #include <java/lang/String.h>
@@ -28,6 +30,37 @@ details.  */
 #include <dlfcn.h>
 #endif
 
+// On some systems, a prefix is attached to a method name before
+// it is exported as a label. The GCC preprocessor predefines 
+// this prefix as the macro __USER_LABEL_PREFIX__ which expands to
+// a string (not string constant) representing the prefix, if any.
+#undef LABEL_PREFIX
+#ifdef __USER_LABEL_PREFIX__
+
+#define USER_LABEL_PREFIX_STRING_0(s) #s
+#define USER_LABEL_PREFIX_STRING(s) USER_LABEL_PREFIX_STRING_0(s)
+
+#define LABEL_PREFIX USER_LABEL_PREFIX_STRING(__USER_LABEL_PREFIX__)
+
+#else /* __USER_LABEL_PREFIX__ */
+
+#define LABEL_PREFIX ""
+
+#endif /* ! __USER_LABEL_PREFIX__ */
+
+java::lang::String*
+gnu::gcj::runtime::NameFinder::getExternalLabel (java::lang::String* name)
+{
+  jsize nameLen = JvGetStringUTFLength (name);
+  jsize pfxLen = strlen (LABEL_PREFIX);
+  char *newName = (char *) JvMalloc (pfxLen + nameLen + 1);
+  *(newName + 0) = '\0';
+  strcpy (newName, LABEL_PREFIX);
+  JvGetStringUTFRegion (name, 0, nameLen, newName + pfxLen);
+  *(newName + pfxLen + nameLen) = '\0';
+  return JvNewStringLatin1 (newName);
+}
+
 java::lang::String*
 gnu::gcj::runtime::NameFinder::getExecutable (void)
 {