Examples with Address org.vmmagic.unboxed.Address used on opensource projects

Example 66 with Address

use of org.vmmagic.unboxed.Address in project JikesRVM by JikesRVM.

the class Memory method arraycopy16Bit.

/**
 * Low level copy of len elements from src[srcPos] to dst[dstPos].
 * <p>
 * Assumption; {@code src != dst || (srcPos &gt;= dstPos + 2)}.
 *
 * @param src     the source array
 * @param srcPos  index in the source array to begin copy
 * @param dst     the destination array
 * @param dstPos  index in the destination array to being copy
 * @param len     number of array elements to copy
 */
public static void arraycopy16Bit(Object src, int srcPos, Object dst, int dstPos, int len) {
    Address srcPtr = Magic.objectAsAddress(src).plus(srcPos << LOG_BYTES_IN_SHORT);
    Address dstPtr = Magic.objectAsAddress(dst).plus(dstPos << LOG_BYTES_IN_SHORT);
    int copyBytes = len << LOG_BYTES_IN_SHORT;
    aligned16Copy(dstPtr, srcPtr, copyBytes);
}

Example 67 with Address

use of org.vmmagic.unboxed.Address in project JikesRVM by JikesRVM.

the class Memory method arraycopy8Bit.

/**
 * Low level copy of len elements from src[srcPos] to dst[dstPos].
 *
 * Assumptions: <code> src != dst || (scrPos &gt;= dstPos + 4) </code>
 *              and src and dst are 8Bit arrays.
 * @param src     the source array
 * @param srcPos  index in the source array to begin copy
 * @param dst     the destination array
 * @param dstPos  index in the destination array to being copy
 * @param len     number of array elements to copy
 */
public static void arraycopy8Bit(Object src, int srcPos, Object dst, int dstPos, int len) {
    Address srcPtr = Magic.objectAsAddress(src).plus(srcPos);
    Address dstPtr = Magic.objectAsAddress(dst).plus(dstPos);
    aligned8Copy(dstPtr, srcPtr, len);
}

Example 68 with Address

use of org.vmmagic.unboxed.Address in project JikesRVM by JikesRVM.

the class Memory method internalAlignedWordCopy.

/**
 * Copy <code>numbytes</code> from <code>src</code> to <code>dst</code>.
 * Assumption either the ranges are non overlapping, or <code>src &gt;= dst + BYTES_IN_ADDRESS</code>.
 * @param dst     The destination addr
 * @param src     The source addr
 * @param numBytes The number of bytes to copy
 */
private static void internalAlignedWordCopy(Address dst, Address src, int numBytes) {
    Address end = src.plus(numBytes);
    while (src.LT(end)) {
        dst.store(src.loadWord());
        src = src.plus(BYTES_IN_ADDRESS);
        dst = dst.plus(BYTES_IN_ADDRESS);
    }
}

Example 69 with Address

use of org.vmmagic.unboxed.Address in project JikesRVM by JikesRVM.

the class RuntimeEntrypoints method deliverHardwareException.

/**
 * Deliver a hardware exception to current java thread.
 * <p>
 * Does not return.
 * (stack is unwound, starting at trap site, and
 *           execution resumes in a catch block somewhere up the stack)
 *     /or/  execution resumes at instruction following trap
 *     (for TRAP_STACK_OVERFLOW)
 *
 * <p> Note:     Control reaches here by the actions of an
 *           external "C" signal handler
 *           which saves the register state of the trap site into the
 *           "exceptionRegisters" field of the current
 *           Thread object.
 *           The signal handler also inserts a &lt;hardware trap&gt; frame
 *           onto the stack immediately above this frame, for use by
 *           HardwareTrapGCMapIterator during garbage collection.
 *
 * @param trapCode code indicating kind of exception that was trapped
 * (see TRAP_xxx, above)
 * @param trapInfo array subscript (for array bounds trap, only), marker
 * (for stack overflow traps on PPC) or
 */
@Entrypoint
@UnpreemptibleNoWarn
static void deliverHardwareException(int trapCode, Word trapInfo) {
    if (VM.verboseSignalHandling)
        VM.sysWriteln("delivering hardware exception");
    RVMThread myThread = RVMThread.getCurrentThread();
    if (VM.verboseSignalHandling)
        VM.sysWriteln("we have a thread = ", Magic.objectAsAddress(myThread));
    if (VM.verboseSignalHandling)
        VM.sysWriteln("it's in state = ", myThread.getExecStatus());
    AbstractRegisters exceptionRegisters = myThread.getExceptionRegisters();
    if (VM.verboseSignalHandling)
        VM.sysWriteln("we have exception registers = ", Magic.objectAsAddress(exceptionRegisters));
    if ((trapCode == TRAP_STACK_OVERFLOW || trapCode == TRAP_JNI_STACK) && myThread.getStack().length < (StackFrameLayout.getMaxStackSize() >> LOG_BYTES_IN_ADDRESS) && !myThread.hasNativeStackFrame()) {
        // (C trap handler has set register.ip to the instruction following the trap).
        if (trapCode == TRAP_JNI_STACK) {
            RVMThread.resizeCurrentStack(myThread.getStackLength() + StackFrameLayout.getJNIStackGrowthSize(), exceptionRegisters);
        } else {
            RVMThread.resizeCurrentStack(myThread.getStackLength() + StackFrameLayout.getStackGrowthSize(), exceptionRegisters);
        }
        if (VM.VerifyAssertions)
            VM._assert(exceptionRegisters.getInUse());
        exceptionRegisters.setInUse(false);
        Magic.restoreHardwareExceptionState(exceptionRegisters);
        if (VM.VerifyAssertions)
            VM._assert(NOT_REACHED);
    }
    // GC stress testing
    if (canForceGC()) {
        // VM.sysWriteln("FORCING GC: in deliverHardwareException");
        System.gc();
    }
    // Hardware traps in uninterruptible code should be considered hard failures.
    if (!VM.sysFailInProgress()) {
        Address fp = exceptionRegisters.getInnermostFramePointer();
        int compiledMethodId = Magic.getCompiledMethodID(fp);
        if (compiledMethodId != StackFrameLayout.getInvisibleMethodID()) {
            CompiledMethod compiledMethod = CompiledMethods.getCompiledMethod(compiledMethodId);
            Address ip = exceptionRegisters.getInnermostInstructionAddress();
            Offset instructionOffset = compiledMethod.getInstructionOffset(ip);
            if (compiledMethod.isWithinUninterruptibleCode(instructionOffset)) {
                VM.sysWriteln();
                switch(trapCode) {
                    case TRAP_NULL_POINTER:
                        VM.sysWriteln("Fatal error: NullPointerException within uninterruptible region.");
                        break;
                    case TRAP_ARRAY_BOUNDS:
                        VM.sysWriteln("Fatal error: ArrayIndexOutOfBoundsException within uninterruptible region (index was ", trapInfo.toInt(), ").");
                        break;
                    case TRAP_DIVIDE_BY_ZERO:
                        VM.sysWriteln("Fatal error: DivideByZero within uninterruptible region.");
                        break;
                    case TRAP_STACK_OVERFLOW:
                    case TRAP_JNI_STACK:
                        VM.sysWriteln("Fatal error: StackOverflowError within uninterruptible region.");
                        break;
                    case TRAP_CHECKCAST:
                        VM.sysWriteln("Fatal error: ClassCastException within uninterruptible region.");
                        break;
                    case TRAP_MUST_IMPLEMENT:
                        VM.sysWriteln("Fatal error: IncompatibleClassChangeError within uninterruptible region.");
                        break;
                    case TRAP_STORE_CHECK:
                        VM.sysWriteln("Fatal error: ArrayStoreException within uninterruptible region.");
                        break;
                    case TRAP_UNREACHABLE_BYTECODE:
                        VM.sysWriteln("Fatal error: Reached a bytecode that was determined to be unreachable within uninterruptible region.");
                        break;
                    default:
                        VM.sysWriteln("Fatal error: Unknown hardware trap within uninterruptible region.");
                        break;
                }
                VM.sysWriteln("trapCode = ", trapCode);
                VM.sysWriteln("trapInfo = ", trapInfo.toAddress());
                VM.sysFail("Exiting virtual machine due to uninterruptibility violation.");
            }
        }
    }
    Throwable exceptionObject;
    switch(trapCode) {
        case TRAP_NULL_POINTER:
            exceptionObject = new java.lang.NullPointerException();
            break;
        case TRAP_ARRAY_BOUNDS:
            exceptionObject = new java.lang.ArrayIndexOutOfBoundsException(trapInfo.toInt());
            break;
        case TRAP_DIVIDE_BY_ZERO:
            exceptionObject = new java.lang.ArithmeticException();
            break;
        case TRAP_STACK_OVERFLOW:
        case TRAP_JNI_STACK:
            exceptionObject = new java.lang.StackOverflowError();
            break;
        case TRAP_CHECKCAST:
            exceptionObject = new java.lang.ClassCastException();
            break;
        case TRAP_MUST_IMPLEMENT:
            exceptionObject = new java.lang.IncompatibleClassChangeError();
            break;
        case TRAP_STORE_CHECK:
            exceptionObject = new java.lang.ArrayStoreException();
            break;
        case TRAP_UNREACHABLE_BYTECODE:
            exceptionObject = new java.lang.InternalError(UNREACHABLE_BC_MESSAGE);
            break;
        default:
            exceptionObject = new java.lang.UnknownError();
            RVMThread.traceback("UNKNOWN ERROR");
            break;
    }
    // VM.enableGC() is called when the exception is delivered.
    VM.disableGC();
    deliverException(exceptionObject, exceptionRegisters);
}

Example 70 with Address

use of org.vmmagic.unboxed.Address in project JikesRVM by JikesRVM.

the class StackTrace method countFramesUninterruptible.

/**
 * Walk the stack counting the number of stack frames encountered.
 * The stack being walked is our stack, so code is Uninterruptible to stop the
 * stack moving.
 *
 * @param stackTraceThread the thread whose stack is walked
 * @return number of stack frames encountered
 */
@Uninterruptible
@NoInline
private int countFramesUninterruptible(RVMThread stackTraceThread) {
    int stackFrameCount = 0;
    Address fp;
    /* Stack trace for the thread */
    if (stackTraceThread == RVMThread.getCurrentThread()) {
        fp = Magic.getFramePointer();
    } else {
        AbstractRegisters contextRegisters = stackTraceThread.getContextRegisters();
        fp = contextRegisters.getInnermostFramePointer();
    }
    fp = Magic.getCallerFramePointer(fp);
    while (Magic.getCallerFramePointer(fp).NE(StackFrameLayout.getStackFrameSentinelFP())) {
        int compiledMethodId = Magic.getCompiledMethodID(fp);
        if (compiledMethodId != StackFrameLayout.getInvisibleMethodID()) {
            CompiledMethod compiledMethod = CompiledMethods.getCompiledMethod(compiledMethodId);
            if ((compiledMethod.getCompilerType() != CompiledMethod.TRAP) && compiledMethod.hasBridgeFromNativeAnnotation()) {
                // skip native frames, stopping at last native frame preceeding the
                // Java To C transition frame
                fp = RuntimeEntrypoints.unwindNativeStackFrame(fp);
            }
        }
        stackFrameCount++;
        fp = Magic.getCallerFramePointer(fp);
    }
    // VM.sysWriteln("stack frame count = ",stackFrameCount);
    return stackFrameCount;
}