diff options
author | Ulf Hermann <ulf.hermann@qt.io> | 2018-11-08 18:09:21 +0100 |
---|---|---|
committer | Ulf Hermann <ulf.hermann@qt.io> | 2018-12-03 08:28:36 +0000 |
commit | 74d23ca548b47c85c4b8cdde5fd5a9026e4eb08c (patch) | |
tree | caf94cffe04b7c6235ccfd5f117b17187733752b /src/qml | |
parent | faf99c36d29bfad629fb6ec541ccc2f61ef93443 (diff) |
V4: Generate function tables on 64bit windows
In order for global exception handlers to be called reliably, the runtime
needs to unwind through JIT-generated code. This can be facilitated by
installing a "function table" for each JITed function that specifies "use
the frame pointer".
Also make sure to generate a function table for JIT'ed regular
expressions. Those were forgotten also in the linux case.
Fixes: QTBUG-50061
Change-Id: Ib0b8ae9356ed80afe1cab017e36efa4ccbe73f90
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Diffstat (limited to 'src/qml')
-rw-r--r-- | src/qml/jit/qv4assemblercommon.cpp | 44 | ||||
-rw-r--r-- | src/qml/jsruntime/jsruntime.pri | 20 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4executableallocator.cpp | 10 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4executableallocator_p.h | 1 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4function.cpp | 17 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4function_p.h | 5 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4functiontable_noop.cpp | 65 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4functiontable_p.h | 75 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4functiontable_unix.cpp | 99 | ||||
-rw-r--r-- | src/qml/jsruntime/qv4functiontable_win64.cpp | 153 |
10 files changed, 447 insertions, 42 deletions
diff --git a/src/qml/jit/qv4assemblercommon.cpp b/src/qml/jit/qv4assemblercommon.cpp index b302ac6403..bc17be229d 100644 --- a/src/qml/jit/qv4assemblercommon.cpp +++ b/src/qml/jit/qv4assemblercommon.cpp @@ -43,6 +43,7 @@ #include "qv4engine_p.h" #include "qv4assemblercommon_p.h" #include <private/qv4function_p.h> +#include <private/qv4functiontable_p.h> #include <private/qv4runtime_p.h> #include <assembler/MacroAssemblerCodeRef.h> @@ -112,17 +113,6 @@ static void printDisassembledOutputWithCalls(QByteArray processedOutput, qDebug("%s", processedOutput.constData()); } -static QByteArray functionName(Function *function) -{ - QByteArray name = function->name()->toQString().toUtf8(); - if (name.isEmpty()) { - name = QByteArray::number(reinterpret_cast<quintptr>(function), 16); - name.prepend("QV4::Function(0x"); - name.append(')'); - } - return name; -} - JIT::PlatformAssemblerCommon::~PlatformAssemblerCommon() {} @@ -147,7 +137,9 @@ void PlatformAssemblerCommon::link(Function *function, const char *jitKind) buf.open(QIODevice::WriteOnly); WTF::setDataFile(new QIODevicePrintStream(&buf)); - QByteArray name = functionName(function); + // We use debugAddress here because it's actually for debugging and hidden behind an + // environment variable. + const QByteArray name = Function::prettyName(function, linkBuffer.debugAddress()).toUtf8(); codeRef = linkBuffer.finalizeCodeWithDisassembly(jitKind, "function %s", name.constData()); WTF::setDataFile(stderr); @@ -159,31 +151,9 @@ void PlatformAssemblerCommon::link(Function *function, const char *jitKind) function->codeRef = new JSC::MacroAssemblerCodeRef(codeRef); function->jittedCode = reinterpret_cast<Function::JittedCode>(function->codeRef->code().executableAddress()); - // This implements writing of JIT'd addresses so that perf can find the - // symbol names. - // - // Perf expects the mapping to be in a certain place and have certain - // content, for more information, see: - // https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/jit-interface.txt - static bool doProfile = !qEnvironmentVariableIsEmpty("QV4_PROFILE_WRITE_PERF_MAP"); - if (Q_UNLIKELY(doProfile)) { - static QFile perfMapFile(QString::fromLatin1("/tmp/perf-%1.map") - .arg(QCoreApplication::applicationPid())); - static const bool isOpen = perfMapFile.open(QIODevice::WriteOnly); - if (!isOpen) { - qWarning("QV4::JIT::Assembler: Cannot write perf map file."); - doProfile = false; - } else { - perfMapFile.write(QByteArray::number(reinterpret_cast<quintptr>( - codeRef.code().executableAddress()), 16)); - perfMapFile.putChar(' '); - perfMapFile.write(QByteArray::number(static_cast<qsizetype>(codeRef.size()), 16)); - perfMapFile.putChar(' '); - perfMapFile.write(functionName(function)); - perfMapFile.putChar('\n'); - perfMapFile.flush(); - } - } + generateFunctionTable(function, &codeRef); + + linkBuffer.makeExecutable(); } void PlatformAssemblerCommon::prepareCallWithArgCount(int argc) diff --git a/src/qml/jsruntime/jsruntime.pri b/src/qml/jsruntime/jsruntime.pri index 5ec55b960b..f256718ac9 100644 --- a/src/qml/jsruntime/jsruntime.pri +++ b/src/qml/jsruntime/jsruntime.pri @@ -147,7 +147,8 @@ HEADERS += \ $$PWD/qv4value_p.h \ $$PWD/qv4string_p.h \ $$PWD/qv4util_p.h \ - $$PWD/qv4value_p.h + $$PWD/qv4value_p.h \ + $$PWD/qv4functiontable_p.h SOURCES += \ $$PWD/qv4engine.cpp \ @@ -156,6 +157,23 @@ SOURCES += \ $$PWD/qv4value.cpp \ $$PWD/qv4executableallocator.cpp +qmldevtools_build { + SOURCES += \ + $$PWD/qv4functiontable_noop.cpp +} else:win32 { + equals(QT_ARCH, x86_64){ + SOURCES += \ + $$PWD/qv4functiontable_win64.cpp + } else { + SOURCES += \ + $$PWD/qv4functiontable_noop.cpp + } +} else { + SOURCES += \ + $$PWD/qv4functiontable_unix.cpp +} + + valgrind { DEFINES += V4_USE_VALGRIND } diff --git a/src/qml/jsruntime/qv4executableallocator.cpp b/src/qml/jsruntime/qv4executableallocator.cpp index 6f04a712e6..c836d121e3 100644 --- a/src/qml/jsruntime/qv4executableallocator.cpp +++ b/src/qml/jsruntime/qv4executableallocator.cpp @@ -38,17 +38,23 @@ ****************************************************************************/ #include "qv4executableallocator_p.h" +#include "qv4functiontable_p.h" #include <wtf/StdLibExtras.h> #include <wtf/PageAllocation.h> using namespace QV4; -void *ExecutableAllocator::Allocation::start() const +void *ExecutableAllocator::Allocation::exceptionHandler() const { return reinterpret_cast<void*>(addr); } +void *ExecutableAllocator::Allocation::start() const +{ + return reinterpret_cast<void*>(addr + exceptionHandlerSize()); +} + void ExecutableAllocator::Allocation::deallocate(ExecutableAllocator *allocator) { if (isValid()) @@ -162,7 +168,7 @@ ExecutableAllocator::Allocation *ExecutableAllocator::allocate(size_t size) Allocation *allocation = nullptr; // Code is best aligned to 16-byte boundaries. - size = WTF::roundUpToMultipleOf(16, size); + size = WTF::roundUpToMultipleOf(16, size + exceptionHandlerSize()); QMultiMap<size_t, Allocation*>::Iterator it = freeAllocations.lowerBound(size); if (it != freeAllocations.end()) { diff --git a/src/qml/jsruntime/qv4executableallocator_p.h b/src/qml/jsruntime/qv4executableallocator_p.h index 375c9a365f..013c6d7120 100644 --- a/src/qml/jsruntime/qv4executableallocator_p.h +++ b/src/qml/jsruntime/qv4executableallocator_p.h @@ -86,6 +86,7 @@ public: , free(true) {} + void *exceptionHandler() const; void *start() const; void invalidate() { addr = 0; } bool isValid() const { return addr != 0; } diff --git a/src/qml/jsruntime/qv4function.cpp b/src/qml/jsruntime/qv4function.cpp index 941c37de5b..2a82d96f1d 100644 --- a/src/qml/jsruntime/qv4function.cpp +++ b/src/qml/jsruntime/qv4function.cpp @@ -46,6 +46,7 @@ #include "qv4lookup_p.h" #include <private/qv4mm_p.h> #include <private/qv4identifiertable_p.h> +#include <private/qv4functiontable_p.h> #include <assembler/MacroAssemblerCodeRef.h> #include <private/qv4vme_moth_p.h> #include <private/qqmlglobal_p.h> @@ -98,7 +99,10 @@ Function::Function(ExecutionEngine *engine, CompiledData::CompilationUnit *unit, Function::~Function() { - delete codeRef; + if (codeRef) { + destroyFunctionTable(this, codeRef); + delete codeRef; + } } void Function::updateInternalClass(ExecutionEngine *engine, const QList<QByteArray> ¶meters) @@ -145,6 +149,17 @@ void Function::updateInternalClass(ExecutionEngine *engine, const QList<QByteArr nFormals = parameters.size(); } +QString Function::prettyName(const Function *function, const void *code) +{ + QString prettyName = function ? function->name()->toQString() : QString(); + if (prettyName.isEmpty()) { + prettyName = QString::number(reinterpret_cast<quintptr>(code), 16); + prettyName.prepend(QLatin1String("QV4::Function(0x")); + prettyName.append(QLatin1Char(')')); + } + return prettyName; +} + QQmlSourceLocation Function::sourceLocation() const { return QQmlSourceLocation(sourceFile(), compiledFunction->location.line, compiledFunction->location.column); diff --git a/src/qml/jsruntime/qv4function_p.h b/src/qml/jsruntime/qv4function_p.h index 029dd7786b..86343ea061 100644 --- a/src/qml/jsruntime/qv4function_p.h +++ b/src/qml/jsruntime/qv4function_p.h @@ -89,9 +89,12 @@ struct Q_QML_EXPORT Function { // used when dynamically assigning signal handlers (QQmlConnection) void updateInternalClass(ExecutionEngine *engine, const QList<QByteArray> ¶meters); - inline Heap::String *name() { + inline Heap::String *name() const { return compilationUnit->runtimeStrings[compiledFunction->nameIndex]; } + + static QString prettyName(const Function *function, const void *address); + inline QString sourceFile() const { return compilationUnit->fileName(); } inline QUrl finalUrl() const { return compilationUnit->finalUrl(); } diff --git a/src/qml/jsruntime/qv4functiontable_noop.cpp b/src/qml/jsruntime/qv4functiontable_noop.cpp new file mode 100644 index 0000000000..31c198eb00 --- /dev/null +++ b/src/qml/jsruntime/qv4functiontable_noop.cpp @@ -0,0 +1,65 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qv4functiontable_p.h" + +QT_BEGIN_NAMESPACE + +namespace QV4 { + +void generateFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef) +{ + Q_UNUSED(function); + Q_UNUSED(codeRef); +} + +void destroyFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef) +{ + Q_UNUSED(function); + Q_UNUSED(codeRef); +} + +size_t exceptionHandlerSize() +{ + return 0; +} + +} // QV4 + +QT_END_NAMESPACE diff --git a/src/qml/jsruntime/qv4functiontable_p.h b/src/qml/jsruntime/qv4functiontable_p.h new file mode 100644 index 0000000000..69e3d2bdd5 --- /dev/null +++ b/src/qml/jsruntime/qv4functiontable_p.h @@ -0,0 +1,75 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QV4FUNCTIONTABLE_P_H +#define QV4FUNCTIONTABLE_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include "qv4global_p.h" + +namespace JSC { +class MacroAssemblerCodeRef; +} + +QT_BEGIN_NAMESPACE + +namespace QV4 { + +struct Function; + +void generateFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef); +void destroyFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef); + +size_t exceptionHandlerSize(); + +} + +QT_END_NAMESPACE + +#endif // QV4FUNCTIONTABLE_P_H diff --git a/src/qml/jsruntime/qv4functiontable_unix.cpp b/src/qml/jsruntime/qv4functiontable_unix.cpp new file mode 100644 index 0000000000..25b5c27161 --- /dev/null +++ b/src/qml/jsruntime/qv4functiontable_unix.cpp @@ -0,0 +1,99 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qv4functiontable_p.h" +#include "qv4function_p.h" + +#include <assembler/MacroAssemblerCodeRef.h> + +#include <QtCore/qfile.h> +#include <QtCore/qcoreapplication.h> + +QT_BEGIN_NAMESPACE + +namespace QV4 { + +void generateFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef) +{ + // This implements writing of JIT'd addresses so that perf can find the + // symbol names. + // + // Perf expects the mapping to be in a certain place and have certain + // content, for more information, see: + // https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/jit-interface.txt + static bool doProfile = !qEnvironmentVariableIsEmpty("QV4_PROFILE_WRITE_PERF_MAP"); + if (Q_UNLIKELY(doProfile)) { + static QFile perfMapFile(QString::fromLatin1("/tmp/perf-%1.map") + .arg(QCoreApplication::applicationPid())); + static const bool isOpen = perfMapFile.open(QIODevice::WriteOnly); + if (!isOpen) { + qWarning("QV4::JIT::Assembler: Cannot write perf map file."); + doProfile = false; + } else { + const void *address = codeRef->code().executableAddress(); + perfMapFile.write(QByteArray::number(reinterpret_cast<quintptr>(address), 16)); + perfMapFile.putChar(' '); + perfMapFile.write(QByteArray::number(static_cast<qsizetype>(codeRef->size()), 16)); + perfMapFile.putChar(' '); + perfMapFile.write(Function::prettyName(function, address).toUtf8()); + perfMapFile.putChar('\n'); + perfMapFile.flush(); + } + } +} + +void destroyFunctionTable(Function *function, JSC::MacroAssemblerCodeRef *codeRef) +{ + Q_UNUSED(function); + Q_UNUSED(codeRef); + + // It's not advisable to remove things from the perf map file, as it's primarily used to analyze + // a trace after the application has terminated. We want to know about all functions that were + // ever jitted then. If the memory ranges overlap, we will have a problem when analyzing the + // trace. The JIT should try to avoid this. +} + +size_t exceptionHandlerSize() +{ + return 0; +} + +} // QV4 + +QT_END_NAMESPACE diff --git a/src/qml/jsruntime/qv4functiontable_win64.cpp b/src/qml/jsruntime/qv4functiontable_win64.cpp new file mode 100644 index 0000000000..bc5b24f6cd --- /dev/null +++ b/src/qml/jsruntime/qv4functiontable_win64.cpp @@ -0,0 +1,153 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qv4functiontable_p.h" + +#include <assembler/MacroAssemblerCodeRef.h> + +#include <QtCore/qdebug.h> + +#include <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()->exceptionHandler()); + + 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()->exceptionHandler()); + 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 |