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#ifndef QV4UNWINDHELPER_PDW2_H
#define QV4UNWINDHELPER_PDW2_H
#include "qv4unwindhelper_p.h"
#include "qv4functionobject_p.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
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