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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 559 insertions, 0 deletions

diff --git a/src/corelib/arch/qatomic_armv6.h b/src/corelib/arch/qatomic_armv6.h
new file mode 100644
index 0000000000..3bd605853f
--- /dev/null
+++ b/src/corelib/arch/qatomic_armv6.h
@@ -0,0 +1,559 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QATOMIC_ARMV6_H
+#define QATOMIC_ARMV6_H
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+#define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_ALWAYS_NATIVE
+
+inline bool QBasicAtomicInt::isReferenceCountingNative()
+{ return true; }
+inline bool QBasicAtomicInt::isReferenceCountingWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_TEST_AND_SET_IS_ALWAYS_NATIVE
+
+inline bool QBasicAtomicInt::isTestAndSetNative()
+{ return true; }
+inline bool QBasicAtomicInt::isTestAndSetWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_FETCH_AND_STORE_IS_ALWAYS_NATIVE
+
+inline bool QBasicAtomicInt::isFetchAndStoreNative()
+{ return true; }
+inline bool QBasicAtomicInt::isFetchAndStoreWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_FETCH_AND_ADD_IS_ALWAYS_NATIVE
+
+inline bool QBasicAtomicInt::isFetchAndAddNative()
+{ return true; }
+inline bool QBasicAtomicInt::isFetchAndAddWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_TEST_AND_SET_IS_ALWAYS_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetNative()
+{ return true; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_ALWAYS_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreNative()
+{ return true; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_ALWAYS_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddNative()
+{ return true; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddWaitFree()
+{ return false; }
+
+#ifndef Q_CC_RVCT
+
+#ifndef Q_DATA_MEMORY_BARRIER
+# define Q_DATA_MEMORY_BARRIER asm volatile("":::"memory")
+#endif
+#ifndef Q_COMPILER_MEMORY_BARRIER
+# define Q_COMPILER_MEMORY_BARRIER asm volatile("":::"memory")
+#endif
+
+inline bool QBasicAtomicInt::ref()
+{
+    register int newValue;
+    register int result;
+    asm volatile("0:\n"
+                 "ldrex %[newValue], [%[_q_value]]\n"
+                 "add %[newValue], %[newValue], #1\n"
+                 "strex %[result], %[newValue], [%[_q_value]]\n"
+                 "teq %[result], #0\n"
+                 "bne 0b\n"
+                 : [newValue] "=&r" (newValue),
+                   [result] "=&r" (result),
+                   "+m" (_q_value)
+                 : [_q_value] "r" (&_q_value)
+                 : "cc", "memory");
+    return newValue != 0;
+}
+
+inline bool QBasicAtomicInt::deref()
+{
+    register int newValue;
+    register int result;
+    asm volatile("0:\n"
+                 "ldrex %[newValue], [%[_q_value]]\n"
+                 "sub %[newValue], %[newValue], #1\n"
+                 "strex %[result], %[newValue], [%[_q_value]]\n"
+                 "teq %[result], #0\n"
+                 "bne 0b\n"
+                 : [newValue] "=&r" (newValue),
+                   [result] "=&r" (result),
+                   "+m" (_q_value)
+                 : [_q_value] "r" (&_q_value)
+                 : "cc", "memory");
+    return newValue != 0;
+}
+
+inline bool QBasicAtomicInt::testAndSetRelaxed(int expectedValue, int newValue)
+{
+    register int result;
+    asm volatile("0:\n"
+                 "ldrex %[result], [%[_q_value]]\n"
+                 "eors %[result], %[result], %[expectedValue]\n"
+                 "strexeq %[result], %[newValue], [%[_q_value]]\n"
+                 "teqeq %[result], #1\n"
+                 "beq 0b\n"
+                 : [result] "=&r" (result),
+                   "+m" (_q_value)
+                 : [expectedValue] "r" (expectedValue),
+                   [newValue] "r" (newValue),
+                   [_q_value] "r" (&_q_value)
+                 : "cc");
+    return result == 0;
+}
+
+inline int QBasicAtomicInt::fetchAndStoreRelaxed(int newValue)
+{
+    register int originalValue;
+    register int result;
+    asm volatile("0:\n"
+                 "ldrex %[originalValue], [%[_q_value]]\n"
+                 "strex %[result], %[newValue], [%[_q_value]]\n"
+                 "teq %[result], #0\n"
+                 "bne 0b\n"
+                 : [originalValue] "=&r" (originalValue),
+                   [result] "=&r" (result),
+                   "+m" (_q_value)
+                 : [newValue] "r" (newValue),
+                   [_q_value] "r" (&_q_value)
+                 : "cc");
+    return originalValue;
+}
+
+inline int QBasicAtomicInt::fetchAndAddRelaxed(int valueToAdd)
+{
+    register int originalValue;
+    register int newValue;
+    register int result;
+    asm volatile("0:\n"
+                 "ldrex %[originalValue], [%[_q_value]]\n"
+                 "add %[newValue], %[originalValue], %[valueToAdd]\n"
+                 "strex %[result], %[newValue], [%[_q_value]]\n"
+                 "teq %[result], #0\n"
+                 "bne 0b\n"
+                 : [originalValue] "=&r" (originalValue),
+                   [newValue] "=&r" (newValue),
+                   [result] "=&r" (result),
+                   "+m" (_q_value)
+                 : [valueToAdd] "r" (valueToAdd),
+                   [_q_value] "r" (&_q_value)
+                 : "cc");
+    return originalValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(T *expectedValue, T *newValue)
+{
+    register T *result;
+    asm volatile("0:\n"
+                 "ldrex %[result], [%[_q_value]]\n"
+                 "eors %[result], %[result], %[expectedValue]\n"
+                 "strexeq %[result], %[newValue], [%[_q_value]]\n"
+                 "teqeq %[result], #1\n"
+                 "beq 0b\n"
+                 : [result] "=&r" (result),
+                   "+m" (_q_value)
+                 : [expectedValue] "r" (expectedValue),
+                   [newValue] "r" (newValue),
+                   [_q_value] "r" (&_q_value)
+                 : "cc");
+    return result == 0;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelaxed(T *newValue)
+{
+    register T *originalValue;
+    register int result;
+    asm volatile("0:\n"
+                 "ldrex %[originalValue], [%[_q_value]]\n"
+                 "strex %[result], %[newValue], [%[_q_value]]\n"
+                 "teq %[result], #0\n"
+                 "bne 0b\n"
+                 : [originalValue] "=&r" (originalValue),
+                   [result] "=&r" (result),
+                   "+m" (_q_value)
+                 : [newValue] "r" (newValue),
+                   [_q_value] "r" (&_q_value)
+                 : "cc");
+    return originalValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelaxed(qptrdiff valueToAdd)
+{
+    register T *originalValue;
+    register T *newValue;
+    register int result;
+    asm volatile("0:\n"
+                 "ldrex %[originalValue], [%[_q_value]]\n"
+                 "add %[newValue], %[originalValue], %[valueToAdd]\n"
+                 "strex %[result], %[newValue], [%[_q_value]]\n"
+                 "teq %[result], #0\n"
+                 "bne 0b\n"
+                 : [originalValue] "=&r" (originalValue),
+                   [newValue] "=&r" (newValue),
+                   [result] "=&r" (result),
+                   "+m" (_q_value)
+                 : [valueToAdd] "r" (valueToAdd * sizeof(T)),
+                   [_q_value] "r" (&_q_value)
+                 : "cc");
+    return originalValue;
+}
+
+#else
+// This is Q_CC_RVCT
+
+// RVCT inline assembly documentation:
+// http://www.keil.com/support/man/docs/armcc/armcc_chdcffdb.htm
+// RVCT embedded assembly documentation:
+// http://www.keil.com/support/man/docs/armcc/armcc_chddbeib.htm
+
+#if __TARGET_ARCH_THUMB-0 < 4
+// save our pragma state and switch to ARM mode (unless using Thumb2)
+# pragma push
+# pragma arm
+#endif
+
+#ifndef Q_DATA_MEMORY_BARRIER
+# define Q_DATA_MEMORY_BARRIER __schedule_barrier()
+#endif
+#ifndef Q_COMPILER_MEMORY_BARRIER
+# define Q_COMPILER_MEMORY_BARRIER __schedule_barrier()
+#endif
+
+inline bool QBasicAtomicInt::ref()
+{
+    register int newValue;
+    register int result;
+    retry:
+    __asm {
+        ldrex   newValue, [&_q_value]
+        add     newValue, newValue, #1
+        strex   result, newValue, [&_q_value]
+        teq     result, #0
+        bne     retry
+    }
+    return newValue != 0;
+}
+
+inline bool QBasicAtomicInt::deref()
+{
+    register int newValue;
+    register int result;
+    retry:
+    __asm {
+        ldrex   newValue, [&_q_value]
+        sub     newValue, newValue, #1
+        strex   result, newValue, [&_q_value]
+        teq     result, #0
+        bne     retry
+    }
+    return newValue != 0;
+}
+
+inline bool QBasicAtomicInt::testAndSetRelaxed(int expectedValue, int newValue)
+{
+    register int result;
+    retry:
+    __asm {
+        ldrex   result, [&_q_value]
+        eors    result, result, expectedValue
+        strexeq result, newValue, [&_q_value]
+        teqeq   result, #1
+        beq     retry
+    }
+    return result == 0;
+}
+
+inline int QBasicAtomicInt::fetchAndStoreRelaxed(int newValue)
+{
+    register int originalValue;
+    register int result;
+    retry:
+    __asm {
+        ldrex   originalValue, [&_q_value]
+        strex   result, newValue, [&_q_value]
+        teq     result, #0
+        bne     retry
+    }
+    return originalValue;
+}
+
+inline int QBasicAtomicInt::fetchAndAddRelaxed(int valueToAdd)
+{
+    register int originalValue;
+    register int newValue;
+    register int result;
+    retry:
+    __asm {
+        ldrex   originalValue, [&_q_value]
+        add     newValue, originalValue, valueToAdd
+        strex   result, newValue, [&_q_value]
+        teq     result, #0
+        bne     retry
+    }
+    return originalValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(T *expectedValue, T *newValue)
+{
+    register T *result;
+    retry:
+    __asm {
+        ldrex   result, [&_q_value]
+        eors    result, result, expectedValue
+        strexeq result, newValue, [&_q_value]
+        teqeq   result, #1
+        beq     retry
+    }
+    return result == 0;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelaxed(T *newValue)
+{
+    register T *originalValue;
+    register int result;
+    retry:
+    __asm {
+        ldrex   originalValue, [&_q_value]
+        strex   result, newValue, [&_q_value]
+        teq     result, #0
+        bne     retry
+    }
+    return originalValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelaxed(qptrdiff valueToAdd)
+{
+    register T *originalValue;
+    register T *newValue;
+    register int result;
+    retry:
+    __asm {
+        ldrex   originalValue, [&_q_value]
+        add     newValue, originalValue, valueToAdd * sizeof(T)
+        strex   result, newValue, [&_q_value]
+        teq     result, #0
+        bne     retry
+    }
+    return originalValue;
+}
+
+#if __TARGET_ARCH_THUMB-0 < 4
+# pragma pop
+#endif
+
+#endif
+
+// common code
+
+inline bool QBasicAtomicInt::testAndSetAcquire(int expectedValue, int newValue)
+{
+    bool returnValue = testAndSetRelaxed(expectedValue, newValue);
+    Q_DATA_MEMORY_BARRIER;
+    return returnValue;
+}
+
+inline bool QBasicAtomicInt::testAndSetRelease(int expectedValue, int newValue)
+{
+    Q_DATA_MEMORY_BARRIER;
+    return testAndSetRelaxed(expectedValue, newValue);
+}
+
+inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
+{
+    Q_DATA_MEMORY_BARRIER;
+    bool returnValue = testAndSetRelaxed(expectedValue, newValue);
+    Q_COMPILER_MEMORY_BARRIER;
+    return returnValue;
+}
+
+inline int QBasicAtomicInt::fetchAndStoreAcquire(int newValue)
+{
+    int returnValue = fetchAndStoreRelaxed(newValue);
+    Q_DATA_MEMORY_BARRIER;
+    return returnValue;
+}
+
+inline int QBasicAtomicInt::fetchAndStoreRelease(int newValue)
+{
+    Q_DATA_MEMORY_BARRIER;
+    return fetchAndStoreRelaxed(newValue);
+}
+
+inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
+{
+    Q_DATA_MEMORY_BARRIER;
+    int returnValue = fetchAndStoreRelaxed(newValue);
+    Q_COMPILER_MEMORY_BARRIER;
+    return returnValue;
+}
+
+
+inline int QBasicAtomicInt::fetchAndAddAcquire(int valueToAdd)
+{
+    int returnValue = fetchAndAddRelaxed(valueToAdd);
+    Q_DATA_MEMORY_BARRIER;
+    return returnValue;
+}
+
+inline int QBasicAtomicInt::fetchAndAddRelease(int valueToAdd)
+{
+    Q_DATA_MEMORY_BARRIER;
+    return fetchAndAddRelaxed(valueToAdd);
+}
+
+inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd)
+{
+    Q_DATA_MEMORY_BARRIER;
+    int returnValue = fetchAndAddRelaxed(valueToAdd);
+    Q_COMPILER_MEMORY_BARRIER;
+    return returnValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetAcquire(T *expectedValue, T *newValue)
+{
+    bool returnValue = testAndSetRelaxed(expectedValue, newValue);
+    Q_DATA_MEMORY_BARRIER;
+    return returnValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelease(T *expectedValue, T *newValue)
+{
+    Q_DATA_MEMORY_BARRIER;
+    return testAndSetRelaxed(expectedValue, newValue);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue)
+{
+    Q_DATA_MEMORY_BARRIER;
+    bool returnValue = testAndSetAcquire(expectedValue, newValue);
+    Q_COMPILER_MEMORY_BARRIER;
+    return returnValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreAcquire(T *newValue)
+{
+    T *returnValue = fetchAndStoreRelaxed(newValue);
+    Q_DATA_MEMORY_BARRIER;
+    return returnValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelease(T *newValue)
+{
+    Q_DATA_MEMORY_BARRIER;
+    return fetchAndStoreRelaxed(newValue);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
+{
+    Q_DATA_MEMORY_BARRIER;
+    T *returnValue = fetchAndStoreRelaxed(newValue);
+    Q_COMPILER_MEMORY_BARRIER;
+    return returnValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddAcquire(qptrdiff valueToAdd)
+{
+    T *returnValue = fetchAndAddRelaxed(valueToAdd);
+    Q_DATA_MEMORY_BARRIER;
+    return returnValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelease(qptrdiff valueToAdd)
+{
+    Q_DATA_MEMORY_BARRIER;
+    return fetchAndAddRelaxed(valueToAdd);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd)
+{
+    Q_DATA_MEMORY_BARRIER;
+    T *returnValue = fetchAndAddRelaxed(valueToAdd);
+    Q_COMPILER_MEMORY_BARRIER;
+    return returnValue;
+}
+
+#undef Q_DATA_MEMORY_BARRIER
+#undef Q_COMPILER_MEMORY_BARRIER
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QATOMIC_ARMV6_H