# HG changeset patch
# User Stefan Anzinger <stefan.anzinger@oracle.com>
# Date 1436866736 -7200
# Node ID b068e7d4db13ce9816369098b8866208070bc9da
# Parent  5b5b881f4689596ee2c3c3cdeb5ffc9ecd81ef1f
[SPARC] Assert certain scratch registers for stack banging/save instruction

diff -r 5b5b881f4689 -r b068e7d4db13 graal/com.oracle.graal.hotspot.sparc/src/com/oracle/graal/hotspot/sparc/SPARCHotSpotBackend.java
--- a/graal/com.oracle.graal.hotspot.sparc/src/com/oracle/graal/hotspot/sparc/SPARCHotSpotBackend.java	Tue Jul 21 11:30:40 2015 +0200
+++ b/graal/com.oracle.graal.hotspot.sparc/src/com/oracle/graal/hotspot/sparc/SPARCHotSpotBackend.java	Tue Jul 14 11:38:56 2015 +0200
@@ -140,6 +140,7 @@
                     } else {
                         try (ScratchRegister sc = masm.getScratchRegister()) {
                             Register scratch = sc.getRegister();
+                            assert afterFrameInit || isGlobalRegister(scratch) : "Only global (g1-g7) registers are allowed if the frame was not initialized here. Got register " + scratch;
                             new Setx(address.getDisplacement(), scratch).emit(masm);
                             masm.stx(g0, new SPARCAddress(sp, scratch));
                         }
@@ -175,6 +176,7 @@
             } else {
                 try (ScratchRegister sc = masm.getScratchRegister()) {
                     Register scratch = sc.getRegister();
+                    assert isGlobalRegister(scratch) : "Only global registers are allowed before save. Got register " + scratch;
                     new Setx(stackpoinerChange, scratch).emit(masm);
                     masm.save(sp, scratch, sp);
                 }
diff -r 5b5b881f4689 -r b068e7d4db13 jvmci/jdk.internal.jvmci.sparc/src/jdk/internal/jvmci/sparc/SPARC.java
--- a/jvmci/jdk.internal.jvmci.sparc/src/jdk/internal/jvmci/sparc/SPARC.java	Tue Jul 21 11:30:40 2015 +0200
+++ b/jvmci/jdk.internal.jvmci.sparc/src/jdk/internal/jvmci/sparc/SPARC.java	Tue Jul 14 11:38:56 2015 +0200
@@ -318,6 +318,10 @@
         return true;
     }
 
+    public static boolean isGlobalRegister(Register r) {
+        return isCPURegister(r) && g0.number <= r.number && r.number <= g7.number;
+    }
+
     public static boolean isSingleFloatRegister(Register r) {
         return r.name.startsWith("f");
     }