Reduce memory consumption of QtScript/JSC on Symbian

Backport of Jay's patch from https://bugs.webkit.org/show_bug.cgi?id=34349
with minor modifications.

Even though the original patch was rejected upstream and has been
superseded by the patches for https://bugs.webkit.org/show_bug.cgi?id=43185,
those patches are more involved (affecting all platforms), hence
difficult/risky to backport.

Task-number: QTBUG-13361
Reviewed-by: Simon Hausmann

7 files changed, 291 insertions, 3 deletions

diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/ChangeLog b/src/3rdparty/javascriptcore/JavaScriptCore/ChangeLog
index 93431df..fbaf5d2 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/ChangeLog
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/ChangeLog
@@ -1,3 +1,39 @@
+2010-06-18  Tucker Jay  <jay.tucker@nokia.com>
+
+        Reviewed by NOBODY (OOPS!).
+
+        [Symbian] Lazy commit of memory required in JSC register file
+        https://bugs.webkit.org/show_bug.cgi?id=34349
+
+        * JavaScriptCore.pro: Added 1 new Symbian source file
+        * interpreter/RegisterFile.cpp:
+        (JSC::RegisterFile::~RegisterFile):
+        * interpreter/RegisterFile.h:
+        (JSC::RegisterFile::):
+        (JSC::RegisterFile::start):
+        (JSC::RegisterFile::end):
+        (JSC::RegisterFile::size):
+        (JSC::RegisterFile::setNumGlobals):
+        (JSC::RegisterFile::numGlobals):
+        (JSC::RegisterFile::maxGlobals):
+        (JSC::RegisterFile::lastGlobal):
+        (JSC::RegisterFile::markGlobals):
+        (JSC::RegisterFile::markCallFrames):
+        (JSC::isPageAligned):
+        (JSC::RegisterFile::RegisterFile):
+        (JSC::RegisterFile::shrink):
+        (JSC::RegisterFile::grow):
+        * wtf/symbian/RegisterFileAllocatorSymbian.cpp: Added.
+        (WTF::RegisterFileAllocator::RegisterFileAllocator):
+        Helper class to allocate memory required by RegisterFile
+        more efficiently.
+        (WTF::RegisterFileAllocator::~RegisterFileAllocator):
+        (WTF::RegisterFileAllocator::buffer):
+        (WTF::RegisterFileAllocator::grow):
+        (WTF::RegisterFileAllocator::shrink):
+        * wtf/symbian/RegisterFileAllocatorSymbian.h: Added.
+        * wtf/symbian/SymbianDefines.h: Added.
+
 2010-06-19  Thiago Macieira <thiago.macieira@nokia.com>
 
         Reviewed by Kenneth Rohde Christiansen.
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri b/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri
index 75737ae..d75bd31 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri
@@ -211,6 +211,7 @@ SOURCES += \
     wtf/qt/ThreadingQt.cpp \
     wtf/RandomNumber.cpp \
     wtf/RefCountedLeakCounter.cpp \
+    wtf/symbian/RegisterFileAllocatorSymbian.cpp \
     wtf/ThreadingNone.cpp \
     wtf/Threading.cpp \
     wtf/TypeTraits.cpp \
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.cpp
index 939573b..293fc38 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.cpp
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.cpp
@@ -40,6 +40,8 @@ RegisterFile::~RegisterFile()
     VirtualFree(m_buffer, DWORD(m_commitEnd) - DWORD(m_buffer), MEM_DECOMMIT);
 #endif
     VirtualFree(m_buffer, 0, MEM_RELEASE);
+#elif OS(SYMBIAN)
+    delete m_registerFileAllocator;
 #else
     fastFree(m_buffer);
 #endif
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.h b/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.h
index 34e2504..49304d9 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.h
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.h
@@ -41,6 +41,10 @@
 #include <sys/mman.h>
 #endif
 
+#if OS(SYMBIAN)
+#include <wtf/symbian/RegisterFileAllocatorSymbian.h>
+#endif
+
 namespace JSC {
 
 /*
@@ -152,12 +156,21 @@ namespace JSC {
 #if HAVE(VIRTUALALLOC)
         Register* m_commitEnd;
 #endif
+#if OS(SYMBIAN)
+        // Commits and frees a continguous chunk of memory as required
+        WTF::RegisterFileAllocator* m_registerFileAllocator;
+#endif
 
         JSGlobalObject* m_globalObject; // The global object whose vars are currently stored in the register file.
     };
 
     // FIXME: Add a generic getpagesize() to WTF, then move this function to WTF as well.
-    inline bool isPageAligned(size_t size) { return size != 0 && size % (8 * 1024) == 0; }
+    // This is still a hack that should be fixed later. We know that a Symbian page size is 4K.
+    #if OS(SYMBIAN)
+    inline bool isPageAligned(size_t size) { return size && !(size % (4 * 1024)); }
+    #else
+    inline bool isPageAligned(size_t size) { return size && !(size % (8 * 1024)); }
+    #endif
 
     inline RegisterFile::RegisterFile(size_t capacity, size_t maxGlobals)
         : m_numGlobals(0)
@@ -204,7 +217,13 @@ namespace JSC {
             CRASH();
         }
         m_commitEnd = reinterpret_cast<Register*>(reinterpret_cast<char*>(m_buffer) + committedSize);
-    #else 
+    #elif OS(SYMBIAN)
+        m_registerFileAllocator = new WTF::RegisterFileAllocator(bufferLength);
+        m_buffer = (Register*)(m_registerFileAllocator->buffer());
+        // start by committing enough space to hold maxGlobals
+        void* newEnd = (void*)((int)m_buffer + (maxGlobals * sizeof(Register)));
+        m_registerFileAllocator->grow(newEnd);
+    #else
         /* 
          * If neither MMAP nor VIRTUALALLOC are available - use fastMalloc instead.
          *
@@ -226,8 +245,13 @@ namespace JSC {
         if (newEnd >= m_end)
             return;
         m_end = newEnd;
-        if (m_end == m_start && (m_maxUsed - m_start) > maxExcessCapacity)
+        if (m_end == m_start && (m_maxUsed - m_start) > maxExcessCapacity) {
+#if OS(SYMBIAN)
+            m_registerFileAllocator->shrink(newEnd);
+#endif
+
             releaseExcessCapacity();
+        }
     }
 
     inline bool RegisterFile::grow(Register* newEnd)
@@ -252,6 +276,9 @@ namespace JSC {
             m_commitEnd = reinterpret_cast<Register*>(reinterpret_cast<char*>(m_commitEnd) + size);
         }
 #endif
+#if OS(SYMBIAN)
+        m_registerFileAllocator->grow((void*)newEnd);
+#endif
 
         if (newEnd > m_maxUsed)
             m_maxUsed = newEnd;
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/RegisterFileAllocatorSymbian.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/RegisterFileAllocatorSymbian.cpp
new file mode 100644
index 0000000..baa7841
--- /dev/null
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/RegisterFileAllocatorSymbian.cpp
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if OS(SYMBIAN)
+
+#include "RegisterFileAllocatorSymbian.h"
+
+namespace WTF {
+
+/** Efficiently allocates memory pools of size poolSize.
+ * Primarily designed for JSC RegisterFile's needs.
+ * Not thread-safe.
+ */
+RegisterFileAllocator::RegisterFileAllocator(TUint32 reservationSize, TUint32 poolSize) :
+    m_reserved(reservationSize), m_poolSize(poolSize)
+{
+    // Get system's page size value.
+    SYMBIAN_PAGESIZE(m_pageSize);
+
+    // We only accept multiples of system page size for both initial reservation
+    // and the alignment/pool size
+    m_reserved = SYMBIAN_ROUNDUPTOMULTIPLE(m_reserved, m_pageSize);
+    __ASSERT_ALWAYS(SYMBIAN_ROUNDUPTOMULTIPLE(m_poolSize, m_pageSize),
+                    User::Panic(_L("RegisterFileAllocator1"), KErrArgument));
+
+    // Open a Symbian RChunk, and reserve requested virtual address range
+    // Any thread in this process can operate this RChunk due to EOwnerProcess access rights.
+    TInt ret = m_chunk.CreateDisconnectedLocal(0 , 0, (TInt)m_reserved , EOwnerProcess);
+    if (ret != KErrNone)
+        User::Panic(_L("RegisterFileAllocator2"), ret);
+
+    m_buffer = (void*)m_chunk.Base();
+    m_resEnd = (void*)(m_chunk.Base() + m_chunk.MaxSize());
+    m_comEnd = m_buffer;
+}
+
+RegisterFileAllocator::~RegisterFileAllocator()
+{
+    // release everything!
+    m_chunk.Decommit(0, m_chunk.MaxSize());
+    m_chunk.Close();
+}
+
+void* RegisterFileAllocator::buffer() const
+{
+    return m_buffer;
+}
+
+void RegisterFileAllocator::grow(void* newEnd)
+{
+    // trying to commit more memory than reserved!
+    if (newEnd > m_resEnd)
+        return;
+
+    if (newEnd > m_comEnd) {
+        TInt nBytes = (TInt)(newEnd) - (TInt)(m_comEnd);
+        nBytes = SYMBIAN_ROUNDUPTOMULTIPLE(nBytes, m_poolSize);
+        TInt offset = (TInt)m_comEnd - (TInt)m_buffer;
+
+        TInt ret = m_chunk.Commit(offset, nBytes);
+        if (ret == KErrNone)
+            m_comEnd = (void*)(m_chunk.Base() + m_chunk.Size());
+    }
+}
+
+void RegisterFileAllocator::shrink(void* newEnd)
+{
+    if (newEnd < m_comEnd) {
+        TInt nBytes = (TInt)newEnd - (TInt)m_comEnd;
+        if (nBytes >= m_poolSize) {
+            TInt offset = SYMBIAN_ROUNDUPTOMULTIPLE((TUint)newEnd, m_poolSize) - (TInt)m_buffer;
+            nBytes = (TInt)m_comEnd - offset - (TInt)m_buffer;
+            if (nBytes > 0) {
+                TInt ret = m_chunk.Decommit(offset, nBytes);
+                if (ret == KErrNone)
+                    m_comEnd = (void*)(m_chunk.Base() + m_chunk.Size());
+            }
+        }
+    }
+}
+
+} // end of namespace
+
+#endif // SYMBIAN
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/RegisterFileAllocatorSymbian.h b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/RegisterFileAllocatorSymbian.h
new file mode 100644
index 0000000..4cfc8c5
--- /dev/null
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/RegisterFileAllocatorSymbian.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef RegisterFileAllocatorSymbian_h
+#define RegisterFileAllocatorSymbian_h
+
+#include "SymbianDefines.h"
+
+namespace WTF {
+
+/**
+ *  Allocates contiguous regions of size poolSize.
+ *  poolSize must be a multiple of system page size (typically 4K on Symbian/ARM)
+ *
+ *  @param reservationSize Virtual address range to be reserved upon creation of chunk (bytes).
+ *  @param poolSize Size of a single allocation.
+ */
+class RegisterFileAllocator {
+
+public:
+    RegisterFileAllocator(
+            TUint32 reservationSize, TUint32 poolSize = SYMBIAN_REGFILEALLOC_DEFAULTPOOLSIZE);
+    ~RegisterFileAllocator();
+    void* buffer() const;
+    void grow(void* newEnd);
+    void shrink(void* newEnd);
+
+private:
+    RChunk   m_chunk; // Symbian chunk that lets us reserve/commit/decommit
+
+    // all following values are in numbers of bytes
+    TInt     m_pageSize; // cached value of system page size, typically 4K on Symbian
+    TUint32  m_reserved; // total number of reserved bytes in virtual memory
+    TUint32  m_poolSize; // size of one memory pool, set by default to 64K in wtf/symbian/SymbianDefines.h
+
+    void* m_buffer; // pointer to base of the chunk
+    void* m_comEnd; // pointer to end of currently committed memory
+    void* m_resEnd; // pointer to end of reserved memory
+
+};
+
+} // end of namespace
+
+#endif // RegisterFileAllocatorSymbian_h
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/SymbianDefines.h b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/SymbianDefines.h
new file mode 100644
index 0000000..43e22b3
--- /dev/null
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/symbian/SymbianDefines.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef SymbianDefines_h
+#define SymbianDefines_h
+
+#include <e32cmn.h>
+#include <e32std.h>
+#include <hal.h>
+
+#define SYMBIAN_PAGESIZE(x) (HAL::Get(HALData::EMemoryPageSize, x));
+#define SYMBIAN_FREERAM(x)  (HAL::Get(HALData::EMemoryRAMFree, x));
+#define SYMBIAN_ROUNDUPTOMULTIPLE(x, multipleof) ( (x + multipleof - 1) & ~(multipleof - 1) )
+
+#define SYMBIAN_REGFILEALLOC_DEFAULTPOOLSIZE 65536 // 64K
+
+#endif // SymbianDefines_h