lib/VMCore/LLVMContext.cpp

   1 //===-- LLVMContext.cpp - Implement LLVMContext -----------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //  This file implements LLVMContext, as a wrapper around the opaque
  11 //  class LLVMContextImpl.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/LLVMContext.h"
  16 #include "llvm/Metadata.h"
  17 #include "llvm/Constants.h"
  18 #include "llvm/Instruction.h"
  19 #include "llvm/Support/ManagedStatic.h"
  20 #include "llvm/Support/SourceMgr.h"
  21 #include "LLVMContextImpl.h"
  22 using namespace llvm;
  23
  24 static ManagedStatic<LLVMContext> GlobalContext;
  25
  26 LLVMContext& llvm::getGlobalContext() {
  27   return *GlobalContext;
  28 }
  29
  30 LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) {
  31   // Create the fixed metadata kinds. This is done in the same order as the
  32   // MD_* enum values so that they correspond.
  33
  34   // Create the 'dbg' metadata kind.
  35   unsigned DbgID = getMDKindID("dbg");
  36   assert(DbgID == MD_dbg && "dbg kind id drifted"); (void)DbgID;
  37
  38   // Create the 'tbaa' metadata kind.
  39   unsigned TBAAID = getMDKindID("tbaa");
  40   assert(TBAAID == MD_tbaa && "tbaa kind id drifted"); (void)TBAAID;
  41 }
  42 LLVMContext::~LLVMContext() { delete pImpl; }
  43
  44 void LLVMContext::addModule(Module *M) {
  45   pImpl->OwnedModules.insert(M);
  46 }
  47
  48 void LLVMContext::removeModule(Module *M) {
  49   pImpl->OwnedModules.erase(M);
  50 }
  51
  52 //===----------------------------------------------------------------------===//
  53 // Recoverable Backend Errors
  54 //===----------------------------------------------------------------------===//
  55
  56 void LLVMContext::setInlineAsmDiagnosticHandler(void *DiagHandler,
  57                                                 void *DiagContext) {
  58   pImpl->InlineAsmDiagHandler = DiagHandler;
  59   pImpl->InlineAsmDiagContext = DiagContext;
  60 }
  61
  62 /// getInlineAsmDiagnosticHandler - Return the diagnostic handler set by
  63 /// setInlineAsmDiagnosticHandler.
  64 void *LLVMContext::getInlineAsmDiagnosticHandler() const {
  65   return pImpl->InlineAsmDiagHandler;
  66 }
  67
  68 /// getInlineAsmDiagnosticContext - Return the diagnostic context set by
  69 /// setInlineAsmDiagnosticHandler.
  70 void *LLVMContext::getInlineAsmDiagnosticContext() const {
  71   return pImpl->InlineAsmDiagContext;
  72 }
  73
  74 void LLVMContext::emitError(StringRef ErrorStr) {
  75   emitError(0U, ErrorStr);
  76 }
  77
  78 void LLVMContext::emitError(const Instruction *I, StringRef ErrorStr) {
  79   unsigned LocCookie = 0;
  80   if (const MDNode *SrcLoc = I->getMetadata("srcloc")) {
  81     if (SrcLoc->getNumOperands() != 0)
  82       if (const ConstantInt *CI = dyn_cast<ConstantInt>(SrcLoc->getOperand(0)))
  83         LocCookie = CI->getZExtValue();
  84   }
  85   return emitError(LocCookie, ErrorStr);
  86 }
  87
  88 void LLVMContext::emitError(unsigned LocCookie, StringRef ErrorStr) {
  89   // If there is no error handler installed, just print the error and exit.
  90   if (pImpl->InlineAsmDiagHandler == 0) {
  91     errs() << "error: " << ErrorStr << "\n";
  92     exit(1);
  93   }
  94
  95   // If we do have an error handler, we can report the error and keep going.
  96   SMDiagnostic Diag("", "error: " + ErrorStr.str());
  97
  98   ((SourceMgr::DiagHandlerTy)(intptr_t)pImpl->InlineAsmDiagHandler)
  99       (Diag, pImpl->InlineAsmDiagContext, LocCookie);
 100
 101 }
 102
 103 //===----------------------------------------------------------------------===//
 104 // Metadata Kind Uniquing
 105 //===----------------------------------------------------------------------===//
 106
 107 #ifndef NDEBUG
 108 /// isValidName - Return true if Name is a valid custom metadata handler name.
 109 static bool isValidName(StringRef MDName) {
 110   if (MDName.empty())
 111     return false;
 112
 113   if (!isalpha(MDName[0]))
 114     return false;
 115
 116   for (StringRef::iterator I = MDName.begin() + 1, E = MDName.end(); I != E;
 117        ++I) {
 118     if (!isalnum(*I) && *I != '_' && *I != '-' && *I != '.')
 119       return false;
 120   }
 121   return true;
 122 }
 123 #endif
 124
 125 /// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
 126 unsigned LLVMContext::getMDKindID(StringRef Name) const {
 127   assert(isValidName(Name) && "Invalid MDNode name");
 128
 129   // If this is new, assign it its ID.
 130   return
 131     pImpl->CustomMDKindNames.GetOrCreateValue(
 132       Name, pImpl->CustomMDKindNames.size()).second;
 133 }
 134
 135 /// getHandlerNames - Populate client supplied smallvector using custome
 136 /// metadata name and ID.
 137 void LLVMContext::getMDKindNames(SmallVectorImpl<StringRef> &Names) const {
 138   Names.resize(pImpl->CustomMDKindNames.size());
 139   for (StringMap<unsigned>::const_iterator I = pImpl->CustomMDKindNames.begin(),
 140        E = pImpl->CustomMDKindNames.end(); I != E; ++I)
 141     Names[I->second] = I->first();
 142 }