1 files changed, 149 insertions, 0 deletions
diff --git a/src/qml/qml/v4/qv4unwindhelper_p-dw2.h b/src/qml/qml/v4/qv4unwindhelper_p-dw2.h
new file mode 100644
index 0000000000..7941a0dd39
--- /dev/null
+++ b/src/qml/qml/v4/qv4unwindhelper_p-dw2.h
@@ -0,0 +1,149 @@
+#ifndef QV4UNWINDHELPER_PDW2_H
+#define QV4UNWINDHELPER_PDW2_H
+
+#include "qv4unwindhelper_p.h"
+#include "qv4functionobject_p.h"
+#include "qv4function_p.h"
+#include <wtf/Platform.h>
+#include <wtf/PageAllocation.h>
+#include <ExecutableAllocator.h>
+
+#include <QMap>
+#include <QMutex>
+
+#define __USE_GNU
+#include <dlfcn.h>
+
+namespace QV4 {
+
+namespace {
+#if CPU(X86_64)
+// Generated by fdegen
+static const unsigned char cie_fde_data[] = {
+    0x10, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x1, 0x0, 0x8, 0x78, 0x10, 0xc, 0x7, 0x8,
+    0x90, 0x1, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0,
+    0x18, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x41, 0x13, 0x7e, 0x86,
+    0x2, 0x43, 0xd, 0x6, 0x8c, 0x3, 0x8e, 0x4,
+    0x0, 0x0, 0x0, 0x0
+};
+static const int fde_offset = 20;
+static const int initial_location_offset = 28;
+static const int address_range_offset = 36;
+#elif CPU(X86) && OS(LINUX)
+static const unsigned char cie_fde_data[] = {
+    0x10, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x1, 0x0, 0x4, 0x7c, 0x8, 0xc, 0x4, 0x4,
+    0x88, 0x1, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0,
+    0x18, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x41, 0x13, 0x7e, 0x85,
+    0x2, 0x43, 0xd, 0x5, 0x86, 0x3, 0x87, 0x4,
+    0x0, 0x0, 0x0, 0x0,
+};
+static const int fde_offset = 20;
+static const int initial_location_offset = 28;
+static const int address_range_offset = 32;
+#endif
+
+void writeIntPtrValue(unsigned char *addr, intptr_t val)
+{
+    addr[0] = (val >>  0) & 0xff;
+    addr[1] = (val >>  8) & 0xff;
+    addr[2] = (val >> 16) & 0xff;
+    addr[3] = (val >> 24) & 0xff;
+#if QT_POINTER_SIZE == 8
+    addr[4] = (val >> 32) & 0xff;
+    addr[5] = (val >> 40) & 0xff;
+    addr[6] = (val >> 48) & 0xff;
+    addr[7] = (val >> 56) & 0xff;
+#endif
+}
+} // anonymous namespace
+
+extern "C" void __register_frame(void *fde);
+extern "C" void __deregister_frame(void *fde);
+
+struct UnwindInfo : public ExecutableAllocator::PlatformUnwindInfo
+{
+    UnwindInfo(const QByteArray &cieFde);
+    virtual ~UnwindInfo();
+    QByteArray data;
+};
+
+UnwindInfo::UnwindInfo(const QByteArray &cieFde)
+    : data(cieFde)
+{
+    __register_frame(data.data() + fde_offset);
+}
+
+UnwindInfo::~UnwindInfo()
+{
+    __deregister_frame(data.data() + fde_offset);
+}
+
+static void ensureUnwindInfo(Function *f)
+{
+    if (!f->codeRef)
+        return; // Not a JIT generated function
+
+    JSC::ExecutableMemoryHandle *handle = f->codeRef.executableMemory();
+    if (!handle)
+        return;
+    ExecutableAllocator::ChunkOfPages *chunk = handle->chunk();
+
+    // Already registered?
+    if (chunk->unwindInfo)
+        return;
+
+    QByteArray info;
+    info.resize(sizeof(cie_fde_data));
+
+    unsigned char *cie_and_fde = reinterpret_cast<unsigned char *>(info.data());
+    memcpy(cie_and_fde, cie_fde_data, sizeof(cie_fde_data));
+
+    intptr_t ptr = static_cast<char *>(chunk->pages->base()) - static_cast<char *>(0);
+    writeIntPtrValue(cie_and_fde + initial_location_offset, ptr);
+
+    writeIntPtrValue(cie_and_fde + address_range_offset, chunk->pages->size());
+
+    chunk->unwindInfo = new UnwindInfo(info);
+}
+
+void UnwindHelper::prepareForUnwind(ExecutionContext *context)
+{
+    for (ExecutionContext *ctx = context; ctx; ctx = ctx->parent) {
+        if (CallContext *callCtx = ctx->asCallContext())
+            if (FunctionObject *fobj = callCtx->function)
+                if (Function *fun = fobj->function)
+                    ensureUnwindInfo(fun);
+        for (ExecutionContext::EvalCode *code = ctx->currentEvalCode;
+             code; code = code->next)
+            ensureUnwindInfo(code->function);
+    }
+
+    if (context->engine->globalCode)
+        ensureUnwindInfo(context->engine->globalCode);
+}
+
+void UnwindHelper::registerFunction(Function *)
+{
+}
+
+void UnwindHelper::registerFunctions(const QVector<Function *>&)
+{
+}
+
+void UnwindHelper::deregisterFunction(Function *)
+{
+}
+
+void UnwindHelper::deregisterFunctions(const QVector<Function *> &)
+{
+}
+
+}
+
+#endif // QV4UNWINDHELPER_PDW2_H