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author | Filip Pizlo <fpizlo@apple.com> | 2013-05-21 20:03:01 +0000 |
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committer | Filip Pizlo <fpizlo@apple.com> | 2013-05-21 20:03:01 +0000 |
commit | 1441bf7a41b50075cf761cbc794ce3fd0b5762fc (patch) | |
tree | 7fab8692dbd8b536525b99af03b9653a328e0b3a /lib/ExecutionEngine/MCJIT/SectionMemoryManager.cpp | |
parent | 52755c472a738e48a9687240368e4c1f78c45711 (diff) | |
download | llvm-1441bf7a41b50075cf761cbc794ce3fd0b5762fc.tar.gz llvm-1441bf7a41b50075cf761cbc794ce3fd0b5762fc.tar.bz2 llvm-1441bf7a41b50075cf761cbc794ce3fd0b5762fc.tar.xz |
Roll out r182407 and r182408 because they broke builds.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182409 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/ExecutionEngine/MCJIT/SectionMemoryManager.cpp')
-rw-r--r-- | lib/ExecutionEngine/MCJIT/SectionMemoryManager.cpp | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/lib/ExecutionEngine/MCJIT/SectionMemoryManager.cpp b/lib/ExecutionEngine/MCJIT/SectionMemoryManager.cpp index 397426afd4..1bb0103f08 100644 --- a/lib/ExecutionEngine/MCJIT/SectionMemoryManager.cpp +++ b/lib/ExecutionEngine/MCJIT/SectionMemoryManager.cpp @@ -14,6 +14,7 @@ #include "llvm/Config/config.h" #include "llvm/ExecutionEngine/SectionMemoryManager.h" +#include "llvm/Support/DynamicLibrary.h" #include "llvm/Support/MathExtras.h" #ifdef __linux__ @@ -145,6 +146,38 @@ bool SectionMemoryManager::finalizeMemory(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) { @@ -166,6 +199,57 @@ void SectionMemoryManager::invalidateInstructionCache() { CodeMem.AllocatedMem[i].size()); } +static int jit_noop() { + return 0; +} + +void *SectionMemoryManager::getPointerToNamedFunction(const std::string &Name, + bool AbortOnFailure) { +#if defined(__linux__) + //===--------------------------------------------------------------------===// + // Function stubs that are invoked instead of certain library calls + // + // Force the following functions to be linked in to anything that uses the + // JIT. This is a hack designed to work around the all-too-clever Glibc + // strategy of making these functions work differently when inlined vs. when + // not inlined, and hiding their real definitions in a separate archive file + // that the dynamic linker can't see. For more info, search for + // 'libc_nonshared.a' on Google, or read http://llvm.org/PR274. + if (Name == "stat") return (void*)(intptr_t)&stat; + if (Name == "fstat") return (void*)(intptr_t)&fstat; + if (Name == "lstat") return (void*)(intptr_t)&lstat; + if (Name == "stat64") return (void*)(intptr_t)&stat64; + if (Name == "fstat64") return (void*)(intptr_t)&fstat64; + if (Name == "lstat64") return (void*)(intptr_t)&lstat64; + if (Name == "atexit") return (void*)(intptr_t)&atexit; + if (Name == "mknod") return (void*)(intptr_t)&mknod; +#endif // __linux__ + + // We should not invoke parent's ctors/dtors from generated main()! + // On Mingw and Cygwin, the symbol __main is resolved to + // callee's(eg. tools/lli) one, to invoke wrong duplicated ctors + // (and register wrong callee's dtors with atexit(3)). + // We expect ExecutionEngine::runStaticConstructorsDestructors() + // is called before ExecutionEngine::runFunctionAsMain() is called. + if (Name == "__main") return (void*)(intptr_t)&jit_noop; + + const char *NameStr = Name.c_str(); + void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr); + if (Ptr) return Ptr; + + // If it wasn't found and if it starts with an underscore ('_') character, + // try again without the underscore. + if (NameStr[0] == '_') { + Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1); + if (Ptr) return Ptr; + } + + if (AbortOnFailure) + report_fatal_error("Program used external function '" + Name + + "' which could not be resolved!"); + return 0; +} + SectionMemoryManager::~SectionMemoryManager() { for (unsigned i = 0, e = CodeMem.AllocatedMem.size(); i != e; ++i) sys::Memory::releaseMappedMemory(CodeMem.AllocatedMem[i]); |