1 files changed, 117 insertions, 0 deletions
diff --git a/src/qml/jsruntime/qv4functiontable_win64.cpp b/src/qml/jsruntime/qv4functiontable_win64.cpp
new file mode 100644
index 0000000000..c21cdb790a
--- /dev/null
+++ b/src/qml/jsruntime/qv4functiontable_win64.cpp
@@ -0,0 +1,117 @@
+// Copyright (C) 2018 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qv4functiontable_p.h"
+
+#include <assembler/MacroAssemblerCodeRef.h>
+
+#include <QtCore/qdebug.h>
+
+#include <qt_windows.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+enum UnwindOpcode: UINT8
+{
+    UWOP_PUSH_NONVOL = 0, /* info == register number */
+    UWOP_ALLOC_LARGE,     /* no info, alloc size in next 2 slots */
+    UWOP_ALLOC_SMALL,     /* info == size of allocation / 8 - 1 */
+    UWOP_SET_FPREG,       /* no info, FP = RSP + UNWIND_INFO.FPRegOffset*16 */
+    UWOP_SAVE_NONVOL,     /* info == register number, offset in next slot */
+    UWOP_SAVE_NONVOL_FAR, /* info == register number, offset in next 2 slots */
+    UWOP_SAVE_XMM128 = 8, /* info == XMM reg number, offset in next slot */
+    UWOP_SAVE_XMM128_FAR, /* info == XMM reg number, offset in next 2 slots */
+    UWOP_PUSH_MACHFRAME   /* info == 0: no error-code, 1: error-code */
+};
+
+enum Register : UINT8
+{
+    RAX = 0,
+    RCX,
+    RDX,
+    RBX,
+    RSP,
+    RBP,
+    RSI,
+    RDI,
+    NONE = 15
+};
+
+struct UnwindCode
+{
+    UnwindCode(UINT8 offset, UnwindOpcode operation, Register info)
+        : offset(offset), operation(operation), info(info)
+    {}
+
+    UINT8 offset;
+    UINT8 operation: 4;
+    UINT8 info:      4;
+};
+
+struct UnwindInfo
+{
+    UINT8 Version : 3;
+    UINT8 Flags : 5;
+    UINT8 SizeOfProlog;
+    UINT8 CountOfUnwindCodes;
+    UINT8 FrameRegister : 4;
+    UINT8 FrameRegisterOffset : 4;
+    UnwindCode UnwindCodes[2];
+};
+
+struct ExceptionHandlerRecord
+{
+    RUNTIME_FUNCTION handler;
+    UnwindInfo info;
+};
+
+void generateFunctionTable(Function *, JSC::MacroAssemblerCodeRef *codeRef)
+{
+    ExceptionHandlerRecord *record = reinterpret_cast<ExceptionHandlerRecord *>(
+                codeRef->executableMemory()->exceptionHandlerStart());
+
+    record->info.Version             = 1;
+    record->info.Flags               = 0;
+    record->info.SizeOfProlog        = 4;
+    record->info.CountOfUnwindCodes  = 2;
+    record->info.FrameRegister       = RBP;
+    record->info.FrameRegisterOffset = 0;
+
+    // Push frame pointer
+    record->info.UnwindCodes[1] = UnwindCode(1, UWOP_PUSH_NONVOL,  RBP);
+    // Set frame pointer from stack pointer
+    record->info.UnwindCodes[0] = UnwindCode(4,   UWOP_SET_FPREG, NONE);
+
+    const quintptr codeStart = quintptr(codeRef->code().executableAddress());
+    const quintptr codeSize = codeRef->size();
+
+    record->handler.BeginAddress = DWORD(codeStart - quintptr(record));
+    record->handler.EndAddress   = DWORD(codeStart + codeSize - quintptr(record));
+    record->handler.UnwindData   = offsetof(ExceptionHandlerRecord, info);
+
+    if (!RtlAddFunctionTable(&record->handler, 1, DWORD64(record))) {
+        const unsigned int errorCode = GetLastError();
+        qWarning() << "Failed to install win64 unwind hook. Error code:" << errorCode;
+    }
+}
+
+void destroyFunctionTable(Function *, JSC::MacroAssemblerCodeRef *codeRef)
+{
+    ExceptionHandlerRecord *record = reinterpret_cast<ExceptionHandlerRecord *>(
+                codeRef->executableMemory()->exceptionHandlerStart());
+    if (!RtlDeleteFunctionTable(&record->handler)) {
+        const unsigned int errorCode = GetLastError();
+        qWarning() << "Failed to remove win64 unwind hook. Error code:" << errorCode;
+    }
+}
+
+size_t exceptionHandlerSize()
+{
+    return sizeof(ExceptionHandlerRecord);
+}
+
+} // QV4
+
+QT_END_NAMESPACE