RFR: 8078521: AARCH64: Add AArch64 SA support

[Dean Long]

On 4/23/2015 9:22 AM, Andrew Haley wrote:
> http://cr.openjdk.java.net/~aph/8078521/
>
> Andrew.

Unfortunately, this will cause conflicts with our closed port.  I don't 
know if we should try to address those issues here or in a followup 
bug.  We would need something like the following (still untested) to 
allow us to map to a different cpu name:

diff -r d11fb4e8a82e 
agent/src/share/classes/sun/jvm/hotspot/utilities/AltPlatformInfo.java
--- 
a/agent/src/share/classes/sun/jvm/hotspot/utilities/AltPlatformInfo.java 
Tue Mar 24 10:25:09 2015 +0100
+++ 
b/agent/src/share/classes/sun/jvm/hotspot/utilities/AltPlatformInfo.java 
Thu Apr 23 16:17:00 2015 -0400
@@ -27,5 +27,5 @@
  public interface AltPlatformInfo {
    // Additional cpu types can be tested via this interface

-  public boolean knownCPU(String cpu);
-}
\ No newline at end of file
+  public String knownCPU(String cpu);
+}
diff -r d11fb4e8a82e 
agent/src/share/classes/sun/jvm/hotspot/utilities/PlatformInfo.java
--- 
a/agent/src/share/classes/sun/jvm/hotspot/utilities/PlatformInfo.java 
Tue Mar 24 10:25:09 2015 +0100
+++ 
b/agent/src/share/classes/sun/jvm/hotspot/utilities/PlatformInfo.java 
Thu Apr 23 16:17:00 2015 -0400
@@ -57,6 +57,14 @@
       is not recognized as supported, an exception is thrown instead. */
    public static String getCPU() throws UnsupportedPlatformException {
      String cpu = System.getProperty("os.arch");
+    try {
+      Class pic = 
Class.forName("sun.jvm.hotspot.utilities.PlatformInfoClosed");
+      AltPlatformInfo api = (AltPlatformInfo)pic.newInstance();
+      String newCPU = api.knownCPU(cpu);
+      if (newCPU != null) {
+        return cpu;
+      }
+    } catch (Exception e) {}
      if (cpu.equals("i386") || cpu.equals("x86")) {
        return "x86";
      } else if (cpu.equals("sparc") || cpu.equals("sparcv9")) {
@@ -64,13 +72,6 @@
      } else if (cpu.equals("ia64") || cpu.equals("amd64") || 
cpu.equals("x86_64") || cpu.equals("ppc64") || cpu.equals("aarch64")) {
        return cpu;
      } else {
-      try {
-        Class pic = 
Class.forName("sun.jvm.hotspot.utilities.PlatformInfoClosed");
-        AltPlatformInfo api = (AltPlatformInfo)pic.newInstance();
-        if (api.knownCPU(cpu)) {
-          return cpu;
-        }
-      } catch (Exception e) {}
        throw new UnsupportedPlatformException("CPU type " + cpu + " not 
yet supported");
      }
    }