[RISCV64][FIX]Forcing crash when code size is more than supported on this architecture

Author: bakaliosdim

com.oracle.max.asm/src/com/oracle/max/asm/target/riscv64/RISCV64.java

@@ -275,6 +275,8 @@ public static boolean isGeneralPurposeReg(CiRegister reg) {
         return isIntReg(reg) && !reg.equals(zr) && !reg.equals(sp);
     }
 
+    public static final int MAX_DIRECT_JUMP_SIZE = CiUtil.M - CiUtil.K;
+
     @Override
     public boolean usesTrampolines() {
         return true;

com.sun.c1x/src/com/sun/c1x/C1XCompiler.java

@@ -20,6 +20,7 @@
  */
 package com.sun.c1x;
 
+import com.oracle.max.asm.target.riscv64.RISCV64;
 import com.oracle.max.cri.intrinsics.IntrinsicImpl;
 import com.oracle.max.criutils.TTY;
 import com.sun.c1x.debug.CFGPrinterObserver;
@@ -114,6 +115,9 @@ public CiResult compileMethod(RiResolvedMethod method, int osrBCI, CiStatistics
                 TTY.println(String.format("C1X %4d %-70s %-45s %-50s | %3d.%dms %5dB", index, "", "", "", time / 10, time % 10, result.targetMethod().targetCodeSize()));
             }
         }
+        if (target.arch.isRISCV64() && result.targetMethod().targetCodeSize() >= RISCV64.MAX_DIRECT_JUMP_SIZE) {
+            throw new CiBailout("methods larger than 1MB are not supported in RISCV64: ");
+        }
 
         return result;
     }