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Use getExecutionEngine to obtain the JIT for Cling > LLVM16 #330

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Oct 22, 2024
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Use getExecutionEngine to obtain the JIT for Cling > LLVM16 #330

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31 changes: 25 additions & 6 deletions lib/Interpreter/Compatibility.h
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Original file line number Diff line number Diff line change
Expand Up @@ -85,17 +85,36 @@ inline void maybeMangleDeclName(const clang::GlobalDecl& GD,
cling::utils::Analyze::maybeMangleDeclName(GD, mangledName);
}

inline llvm::orc::LLJIT* getExecutionEngine(const cling::Interpreter& I) {
// FIXME: This is a horrible hack finding the llvm::orc::LLJIT by computing
// the object offsets in Cling. We should add getExecutionEngine interface
// to directly.
/// For Cling <= LLVM 16, this is a horrible hack obtaining the private
/// llvm::orc::LLJIT by computing the object offsets in the cling::Interpreter
/// instance(IncrementalExecutor): sizeof (m_Opts) + sizeof(m_LLVMContext). The
/// IncrementalJIT and JIT itself have an offset of 0 as the first datamember.
///
/// The getExecutionEngine() interface has been added for Cling based on LLVM
/// >=18 and should be used in future releases.
inline llvm::orc::LLJIT* getExecutionEngine(cling::Interpreter& I) {
#if CLANG_VERSION_MAJOR >= 18
return I.getExecutionEngine();
#endif

// sizeof (m_Opts) + sizeof(m_LLVMContext)
#if CLANG_VERSION_MAJOR == 13
#ifdef __APPLE__
const unsigned m_ExecutorOffset = 62;
#else
const unsigned m_ExecutorOffset = 72;
#endif // __APPLE__
#endif

// Note: The offsets changed in Cling based on LLVM 16 with the introduction of
// a thread safe context - llvm::orc::ThreadSafeContext
#if CLANG_VERSION_MAJOR == 16
#ifdef __APPLE__
const unsigned m_ExecutorOffset = 68;
#else
const unsigned m_ExecutorOffset = 78;
#endif // __APPLE__
#endif

int* IncrementalExecutor =
((int*)(const_cast<cling::Interpreter*>(&I))) + m_ExecutorOffset;
int* IncrementalJit = *(int**)IncrementalExecutor + 0;
Expand All @@ -104,7 +123,7 @@ inline llvm::orc::LLJIT* getExecutionEngine(const cling::Interpreter& I) {
}

inline llvm::Expected<llvm::JITTargetAddress>
getSymbolAddress(const cling::Interpreter& I, llvm::StringRef IRName) {
getSymbolAddress(cling::Interpreter& I, llvm::StringRef IRName) {
if (void* Addr = I.getAddressOfGlobal(IRName))
return (llvm::JITTargetAddress)Addr;

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