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Add EH support to the MCJIT.

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This gets exception handling working on ELF and Macho (x86-64 at least).
Other than the EH frame registration, this patch also implements support
for GOT relocations which are used to locate the personality function on
MachO.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181167 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2013-05-05 20:43:10 +00:00
parent 9f2bebbc28
commit a2e40fbd62
11 changed files with 188 additions and 14 deletions
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32
lib/ExecutionEngine/MCJIT/SectionMemoryManager.cpp
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@ -146,6 +146,38 @@ bool SectionMemoryManager::applyPermissions(std::string *ErrMsg)
return false;
}
// Determine whether we can register EH tables.
#if (defined(__GNUC__) && !defined(__ARM_EABI__) && \
!defined(__USING_SJLJ_EXCEPTIONS__))
#define HAVE_EHTABLE_SUPPORT 1
#else
#define HAVE_EHTABLE_SUPPORT 0
#endif
#if HAVE_EHTABLE_SUPPORT
extern "C" void __register_frame(void*);
static const char *processFDE(const char *Entry) {
const char *P = Entry;
uint32_t Length = *((uint32_t*)P);
P += 4;
uint32_t Offset = *((uint32_t*)P);
if (Offset != 0)
__register_frame((void*)Entry);
return P + Length;
}
#endif
void SectionMemoryManager::registerEHFrames(StringRef SectionData) {
#if HAVE_EHTABLE_SUPPORT
const char *P = SectionData.data();
const char *End = SectionData.data() + SectionData.size();
do {
P = processFDE(P);
} while(P != End);
#endif
}
error_code SectionMemoryManager::applyMemoryGroupPermissions(MemoryGroup &MemGroup,
unsigned Permissions) {