mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-09-20 11:26:35 +00:00
Adding support for deregistering EH frames with MCJIT.
Patch by Yaron Keren git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192753 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
@@ -42,17 +42,53 @@ RTDyldMemoryManager::~RTDyldMemoryManager() {}
|
||||
|
||||
#if HAVE_EHTABLE_SUPPORT
|
||||
extern "C" void __register_frame(void*);
|
||||
extern "C" void __deregister_frame(void*);
|
||||
#else
|
||||
// The building compiler does not have __(de)register_frame but
|
||||
// it may be found at runtime in a dynamically-loaded library.
|
||||
// For example, this happens when building LLVM with Visual C++
|
||||
// but using the MingW runtime.
|
||||
void __register_frame(void *p) {
|
||||
static bool Searched = false;
|
||||
static void *rf = 0;
|
||||
|
||||
static const char *processFDE(const char *Entry) {
|
||||
if (!Searched) {
|
||||
Searched = true;
|
||||
rf = llvm::sys::DynamicLibrary::SearchForAddressOfSymbol(
|
||||
"__register_frame");
|
||||
}
|
||||
if (rf)
|
||||
((void (*)(void *))rf)(p);
|
||||
}
|
||||
|
||||
void __deregister_frame(void *p) {
|
||||
static bool Searched = false;
|
||||
static void *df = 0;
|
||||
|
||||
if (!Searched) {
|
||||
Searched = true;
|
||||
df = llvm::sys::DynamicLibrary::SearchForAddressOfSymbol(
|
||||
"__deregister_frame");
|
||||
}
|
||||
if (df)
|
||||
((void (*)(void *))df)(p);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef __APPLE__
|
||||
|
||||
static const char *processFDE(const char *Entry, bool isDeregister) {
|
||||
const char *P = Entry;
|
||||
uint32_t Length = *((const uint32_t *)P);
|
||||
P += 4;
|
||||
uint32_t Offset = *((const uint32_t *)P);
|
||||
if (Offset != 0)
|
||||
__register_frame(const_cast<char *>(Entry));
|
||||
if (isDeregister)
|
||||
__deregister_frame(const_cast<char *>(Entry));
|
||||
else
|
||||
__register_frame(const_cast<char *>(Entry));
|
||||
return P + Length;
|
||||
}
|
||||
#endif
|
||||
|
||||
// This implementation handles frame registration for local targets.
|
||||
// Memory managers for remote targets should re-implement this function
|
||||
@@ -60,15 +96,50 @@ static const char *processFDE(const char *Entry) {
|
||||
void RTDyldMemoryManager::registerEHFrames(uint8_t *Addr,
|
||||
uint64_t LoadAddr,
|
||||
size_t Size) {
|
||||
#if HAVE_EHTABLE_SUPPORT
|
||||
// On OS X OS X __register_frame takes a single FDE as an argument.
|
||||
// See http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-April/061768.html
|
||||
const char *P = (const char *)Addr;
|
||||
const char *End = P + Size;
|
||||
do {
|
||||
P = processFDE(P);
|
||||
P = processFDE(P, false);
|
||||
} while(P != End);
|
||||
#endif
|
||||
}
|
||||
|
||||
void RTDyldMemoryManager::deregisterEHFrames(uint8_t *Addr,
|
||||
uint64_t LoadAddr,
|
||||
size_t Size) {
|
||||
const char *P = (const char *)Addr;
|
||||
const char *End = P + Size;
|
||||
do {
|
||||
P = processFDE(P, true);
|
||||
} while(P != End);
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
void RTDyldMemoryManager::registerEHFrames(uint8_t *Addr,
|
||||
uint64_t LoadAddr,
|
||||
size_t Size) {
|
||||
// On Linux __register_frame takes a single argument:
|
||||
// a pointer to the start of the .eh_frame section.
|
||||
|
||||
// How can it find the end? Because crtendS.o is linked
|
||||
// in and it has an .eh_frame section with four zero chars.
|
||||
// FIXME: make sure EH frame is followed by four zero bytes.
|
||||
// This should be done in the linker RuntimeDyldELF::getEHFrameSection(),
|
||||
// return pointer to .eh_frame properly appended by four zero bytes.
|
||||
// If the linker can not fixed, do it here.
|
||||
__register_frame(Addr);
|
||||
}
|
||||
|
||||
void RTDyldMemoryManager::deregisterEHFrames(uint8_t *Addr,
|
||||
uint64_t LoadAddr,
|
||||
size_t Size) {
|
||||
__deregister_frame(Addr);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
static int jit_noop() {
|
||||
return 0;
|
||||
}
|
||||
|
Reference in New Issue
Block a user