From 6bb0b400835e3844aec6d696478aac73f5cbce33 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9rgio=20Martins?= <sergio.martins@kdab.com>
Date: Thu, 29 Aug 2013 15:21:40 +0100
Subject: [PATCH] wince: Build fix, NtCurrentTeb() is not available in this
platform.
This was copied from qtscript's:
src/3rdparty/javascriptcore/JavaScriptCore/runtime/Collector.cpp
Change-Id: Iaa5549e6915aa4aa4bf532fbe7c9117a0858ff02
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
---
src/qml/jsruntime/qv4mm.cpp | 65 +++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff --git a/src/qml/jsruntime/qv4mm.cpp b/src/qml/jsruntime/qv4mm.cpp
index 0233af29b9..b7a206abdf 100644
--- a/src/qml/jsruntime/qv4mm.cpp
+++ b/src/qml/jsruntime/qv4mm.cpp
@@ -74,6 +74,63 @@ using namespace WTF;
static const std::size_t CHUNK_SIZE = 1024*32;
+#if OS(WINCE)
+void* g_stackBase = 0;
+
+inline bool isPageWritable(void* page)
+{
+ MEMORY_BASIC_INFORMATION memoryInformation;
+ DWORD result = VirtualQuery(page, &memoryInformation, sizeof(memoryInformation));
+
+ // return false on error, including ptr outside memory
+ if (result != sizeof(memoryInformation))
+ return false;
+
+ DWORD protect = memoryInformation.Protect & ~(PAGE_GUARD | PAGE_NOCACHE);
+ return protect == PAGE_READWRITE
+ || protect == PAGE_WRITECOPY
+ || protect == PAGE_EXECUTE_READWRITE
+ || protect == PAGE_EXECUTE_WRITECOPY;
+}
+
+static void* getStackBase(void* previousFrame)
+{
+ // find the address of this stack frame by taking the address of a local variable
+ bool isGrowingDownward;
+ void* thisFrame = (void*)(&isGrowingDownward);
+
+ isGrowingDownward = previousFrame < &thisFrame;
+ static DWORD pageSize = 0;
+ if (!pageSize) {
+ SYSTEM_INFO systemInfo;
+ GetSystemInfo(&systemInfo);
+ pageSize = systemInfo.dwPageSize;
+ }
+
+ // scan all of memory starting from this frame, and return the last writeable page found
+ register char* currentPage = (char*)((DWORD)thisFrame & ~(pageSize - 1));
+ if (isGrowingDownward) {
+ while (currentPage > 0) {
+ // check for underflow
+ if (currentPage >= (char*)pageSize)
+ currentPage -= pageSize;
+ else
+ currentPage = 0;
+ if (!isPageWritable(currentPage))
+ return currentPage + pageSize;
+ }
+ return 0;
+ } else {
+ while (true) {
+ // guaranteed to complete because isPageWritable returns false at end of memory
+ currentPage += pageSize;
+ if (!isPageWritable(currentPage))
+ return currentPage;
+ }
+ }
+}
+#endif
+
struct MemoryManager::Data
{
bool enableGC;
@@ -172,6 +229,14 @@ MemoryManager::MemoryManager()
m_d->stackTop = static_cast<quintptr *>(stackBottom) + stackSize/sizeof(quintptr);
# endif
+#elif OS(WINCE)
+ if (false && g_stackBase) {
+ // This code path is disabled as we have no way of initializing it yet
+ m_d->stackTop = static_cast<quintptr *>(g_stackBase);
+ } else {
+ int dummy;
+ m_d->stackTop = static_cast<quintptr *>(getStackBase(&dummy));
+ }
#elif OS(WINDOWS)
PNT_TIB tib = (PNT_TIB)NtCurrentTeb();
m_d->stackTop = static_cast<quintptr*>(tib->StackBase);
--
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