diff options
Diffstat (limited to 'src/qml/qml/v4vm/qv4unwindhelper_p-dw2.h')
| -rw-r--r-- | src/qml/qml/v4vm/qv4unwindhelper_p-dw2.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/qml/qml/v4vm/qv4unwindhelper_p-dw2.h b/src/qml/qml/v4vm/qv4unwindhelper_p-dw2.h new file mode 100644 index 0000000000..10c99f539c --- /dev/null +++ b/src/qml/qml/v4vm/qv4unwindhelper_p-dw2.h @@ -0,0 +1,189 @@ +#ifndef QV4UNWINDHELPER_PDW2_H +#define QV4UNWINDHELPER_PDW2_H + +#include <qv4unwindhelper.h> +#include <qv4functionobject.h> +#include <wtf/Platform.h> + +#include <QMap> +#include <QMutex> + +#define __USE_GNU +#include <dlfcn.h> + +namespace QQmlJS { +namespace VM { + +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 +} // anonymous namespace + +static QMutex functionProtector; +static QMap<quintptr, Function*> allFunctions; + +static Function *lookupFunction(void *pc) +{ + quintptr key = reinterpret_cast<quintptr>(pc); + QMap<quintptr, Function*>::ConstIterator it = allFunctions.lowerBound(key); + if (it != allFunctions.begin() && allFunctions.count() > 0) + --it; + if (it == allFunctions.end()) + return 0; + + quintptr codeStart = reinterpret_cast<quintptr>((*it)->code); + if (key < codeStart || key >= codeStart + (*it)->codeSize) + return 0; + return *it; +} + +namespace { +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 + +static void ensureUnwindInfo(Function *f) +{ + if (!f->unwindInfo.isEmpty()) + 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 *>(f->codeRef.code().executableAddress()) - static_cast<char *>(0); + writeIntPtrValue(cie_and_fde + initial_location_offset, ptr); + + writeIntPtrValue(cie_and_fde + address_range_offset, f->codeSize); + + f->unwindInfo = info; +} + +#if defined(Q_OS_DARWIN) +extern "C" void __register_frame(void *fde); +extern "C" void __deregister_frame(void *fde); +#endif + +static void registerFunctionUnlocked(Function *f) +{ + allFunctions.insert(reinterpret_cast<quintptr>(f->code), f); +#if defined(Q_OS_DARWIN) + ensureUnwindInfo(f); + __register_frame(f->unwindInfo.data() + fde_offset); +#endif +} + +static void deregisterFunctionUnlocked(Function *f) +{ + allFunctions.remove(reinterpret_cast<quintptr>(f->code)); +#if defined(Q_OS_DARWIN) + if (!f->unwindInfo.isEmpty()) + __deregister_frame(f->unwindInfo.data() + fde_offset); +#endif +} + +void UnwindHelper::registerFunction(Function *function) +{ + QMutexLocker locker(&functionProtector); + registerFunctionUnlocked(function); +} + +void UnwindHelper::registerFunctions(QVector<Function *> functions) +{ + QMutexLocker locker(&functionProtector); + foreach (Function *f, functions) + registerFunctionUnlocked(f); +} + +void UnwindHelper::deregisterFunction(Function *function) +{ + QMutexLocker locker(&functionProtector); + deregisterFunctionUnlocked(function); +} + +void UnwindHelper::deregisterFunctions(QVector<Function *> functions) +{ + QMutexLocker locker(&functionProtector); + foreach (Function *f, functions) + deregisterFunctionUnlocked(f); +} + +} // VM namespace +} // QQmlJS namespace + +#if defined(Q_OS_LINUX) +extern "C" { + +struct bases +{ + void *tbase; + void *dbase; + void *func; +}; + +Q_V4_EXPORT void *_Unwind_Find_FDE(void *pc, struct bases *bases) +{ + typedef void *(*Old_Unwind_Find_FDE)(void *pc, struct bases *bases); + static Old_Unwind_Find_FDE oldFunction = 0; + if (!oldFunction) + oldFunction = (Old_Unwind_Find_FDE)dlsym(RTLD_NEXT, "_Unwind_Find_FDE"); + + { + QMutexLocker locker(&QQmlJS::VM::functionProtector); + QQmlJS::VM::Function *function = QQmlJS::VM::lookupFunction(pc); + if (function) { + bases->tbase = 0; + bases->dbase = 0; + bases->func = reinterpret_cast<void*>(function->code); + QQmlJS::VM::ensureUnwindInfo(function); + return function->unwindInfo.data() + QQmlJS::VM::fde_offset; + } + } + + return oldFunction(pc, bases); +} + +} +#endif + +#endif // QV4UNWINDHELPER_PDW2_H |