119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===-- JITDebugRegisterer.cpp - Register debug symbols for JIT -----------===// 219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// The LLVM Compiler Infrastructure 419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// This file is distributed under the University of Illinois Open Source 619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// License. See LICENSE.TXT for details. 719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 1019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// This file defines a JITDebugRegisterer object that is used by the JIT to 1119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// register debug info with debuggers like GDB. 1219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 1319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 1419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 1519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "JITDebugRegisterer.h" 1619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "../../CodeGen/ELF.h" 1719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "../../CodeGen/ELFWriter.h" 1819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/LLVMContext.h" 1919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Function.h" 2019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Module.h" 2119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Target/TargetMachine.h" 2219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Target/TargetOptions.h" 2319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/ADT/DenseMap.h" 2419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/ADT/OwningPtr.h" 2519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Support/Compiler.h" 2619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Support/MutexGuard.h" 2719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Support/raw_ostream.h" 2819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Support/Mutex.h" 2919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include <string> 3019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 3119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumannamespace llvm { 3219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 3319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// This must be kept in sync with gdb/gdb/jit.h . 3419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanextern "C" { 3519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 3619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Debuggers puts a breakpoint in this function. 3719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman LLVM_ATTRIBUTE_NOINLINE void __jit_debug_register_code() { } 3819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 3919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // We put information about the JITed function in this global, which the 4019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // debugger reads. Make sure to specify the version statically, because the 4119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // debugger checks the version before we can set it during runtime. 4219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 }; 4319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 4419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 4519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 4619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumannamespace { 4719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 4819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// JITDebugLock - Used to serialize all code registration events, since they 4919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman /// modify global variables. 5019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman sys::Mutex JITDebugLock; 5119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 5219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 5319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 5419bac1e08be200c31efd26f0f5fd144c9b3eefd3John BaumanJITDebugRegisterer::JITDebugRegisterer(TargetMachine &tm) : TM(tm), FnMap() { } 5519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 5619bac1e08be200c31efd26f0f5fd144c9b3eefd3John BaumanJITDebugRegisterer::~JITDebugRegisterer() { 5719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Free all ELF memory. 5819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman for (RegisteredFunctionsMap::iterator I = FnMap.begin(), E = FnMap.end(); 5919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman I != E; ++I) { 6019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Call the private method that doesn't update the map so our iterator 6119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // doesn't break. 6219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman UnregisterFunctionInternal(I); 6319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 6419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman FnMap.clear(); 6519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 6619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 6719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanstd::string JITDebugRegisterer::MakeELF(const Function *F, DebugInfo &I) { 6819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Stack allocate an empty module with an empty LLVMContext for the ELFWriter 6919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // API. We don't use the real module because then the ELFWriter would write 7019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // out unnecessary GlobalValues during finalization. 7119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman LLVMContext Context; 7219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Module M("", Context); 7319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 7419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Make a buffer for the ELF in memory. 7519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman std::string Buffer; 7619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman raw_string_ostream O(Buffer); 7719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ELFWriter EW(O, TM); 7819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman EW.doInitialization(M); 7919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 8019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Copy the binary into the .text section. This isn't necessary, but it's 8119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // useful to be able to disassemble the ELF by hand. 8219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ELFSection &Text = EW.getTextSection(const_cast<Function *>(F)); 8319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Text.Addr = (uint64_t)I.FnStart; 8419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // TODO: We could eliminate this copy if we somehow used a pointer/size pair 8519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // instead of a vector. 8619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Text.getData().assign(I.FnStart, I.FnEnd); 8719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 8819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Copy the exception handling call frame information into the .eh_frame 8919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // section. This allows GDB to get a good stack trace, particularly on 9019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // linux x86_64. Mark this as a PROGBITS section that needs to be loaded 9119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // into memory at runtime. 9219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ELFSection &EH = EW.getSection(".eh_frame", ELF::SHT_PROGBITS, 9319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ELF::SHF_ALLOC); 9419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Pointers in the DWARF EH info are all relative to the EH frame start, 9519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // which is stored here. 9619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman EH.Addr = (uint64_t)I.EhStart; 9719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // TODO: We could eliminate this copy if we somehow used a pointer/size pair 9819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // instead of a vector. 9919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman EH.getData().assign(I.EhStart, I.EhEnd); 10019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 10119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Add this single function to the symbol table, so the debugger prints the 10219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // name instead of '???'. We give the symbol default global visibility. 10319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ELFSym *FnSym = ELFSym::getGV(F, 10419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ELF::STB_GLOBAL, 10519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ELF::STT_FUNC, 10619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman ELF::STV_DEFAULT); 10719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman FnSym->SectionIdx = Text.SectionIdx; 10819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman FnSym->Size = I.FnEnd - I.FnStart; 10919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman FnSym->Value = 0; // Offset from start of section. 11019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman EW.SymbolList.push_back(FnSym); 11119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 11219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman EW.doFinalization(M); 11319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman O.flush(); 11419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 11519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // When trying to debug why GDB isn't getting the debug info right, it's 11619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // awfully helpful to write the object file to disk so that it can be 11719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // inspected with readelf and objdump. 11819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (JITEmitDebugInfoToDisk) { 11919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman std::string Filename; 12019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman raw_string_ostream O2(Filename); 12119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman O2 << "/tmp/llvm_function_" << I.FnStart << "_" << F->getNameStr() << ".o"; 12219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman O2.flush(); 12319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman std::string Errors; 12419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman raw_fd_ostream O3(Filename.c_str(), Errors); 12519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman O3 << Buffer; 12619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman O3.close(); 12719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 12819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 12919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return Buffer; 13019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 13119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 13219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid JITDebugRegisterer::RegisterFunction(const Function *F, DebugInfo &I) { 13319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // TODO: Support non-ELF platforms. 13419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (!TM.getELFWriterInfo()) 13519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return; 13619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 13719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman std::string Buffer = MakeELF(F, I); 13819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 13919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman jit_code_entry *JITCodeEntry = new jit_code_entry(); 14019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman JITCodeEntry->symfile_addr = Buffer.c_str(); 14119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman JITCodeEntry->symfile_size = Buffer.size(); 14219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 14319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Add a mapping from F to the entry and buffer, so we can delete this 14419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // info later. 14519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman FnMap[F] = std::make_pair(Buffer, JITCodeEntry); 14619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 14719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Acquire the lock and do the registration. 14819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman { 14919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman MutexGuard locked(JITDebugLock); 15019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman __jit_debug_descriptor.action_flag = JIT_REGISTER_FN; 15119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 15219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Insert this entry at the head of the list. 15319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman JITCodeEntry->prev_entry = NULL; 15419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman jit_code_entry *NextEntry = __jit_debug_descriptor.first_entry; 15519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman JITCodeEntry->next_entry = NextEntry; 15619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (NextEntry != NULL) { 15719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman NextEntry->prev_entry = JITCodeEntry; 15819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 15919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman __jit_debug_descriptor.first_entry = JITCodeEntry; 16019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman __jit_debug_descriptor.relevant_entry = JITCodeEntry; 16119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman __jit_debug_register_code(); 16219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 16319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 16419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 16519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid JITDebugRegisterer::UnregisterFunctionInternal( 16619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman RegisteredFunctionsMap::iterator I) { 16719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman jit_code_entry *&JITCodeEntry = I->second.second; 16819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 16919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Acquire the lock and do the unregistration. 17019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman { 17119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman MutexGuard locked(JITDebugLock); 17219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman __jit_debug_descriptor.action_flag = JIT_UNREGISTER_FN; 17319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 17419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Remove the jit_code_entry from the linked list. 17519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman jit_code_entry *PrevEntry = JITCodeEntry->prev_entry; 17619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman jit_code_entry *NextEntry = JITCodeEntry->next_entry; 17719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (NextEntry) { 17819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman NextEntry->prev_entry = PrevEntry; 17919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 18019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (PrevEntry) { 18119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman PrevEntry->next_entry = NextEntry; 18219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } else { 18319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman assert(__jit_debug_descriptor.first_entry == JITCodeEntry); 18419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman __jit_debug_descriptor.first_entry = NextEntry; 18519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 18619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 18719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Tell GDB which entry we removed, and unregister the code. 18819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman __jit_debug_descriptor.relevant_entry = JITCodeEntry; 18919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman __jit_debug_register_code(); 19019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 19119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 19219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman delete JITCodeEntry; 19319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman JITCodeEntry = NULL; 19419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 19519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Free the ELF file in memory. 19619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman std::string &Buffer = I->second.first; 19719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Buffer.clear(); 19819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 19919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 20019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid JITDebugRegisterer::UnregisterFunction(const Function *F) { 20119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // TODO: Support non-ELF platforms. 20219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (!TM.getELFWriterInfo()) 20319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return; 20419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 20519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman RegisteredFunctionsMap::iterator I = FnMap.find(F); 20619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (I == FnMap.end()) return; 20719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman UnregisterFunctionInternal(I); 20819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman FnMap.erase(I); 20919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 21019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 21119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} // end namespace llvm 212