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 #include <cctype>
  23 using namespace llvm;
  24
  25 static ManagedStatic<LLVMContext> GlobalContext;
  26
  27 LLVMContext& llvm::getGlobalContext() {
  28   return *GlobalContext;
  29 }
  30
  31 LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) {
  32   // Create the fixed metadata kinds. This is done in the same order as the
  33   // MD_* enum values so that they correspond.
  34
  35   // Create the 'dbg' metadata kind.
  36   unsigned DbgID = getMDKindID("dbg");
  37   assert(DbgID == MD_dbg && "dbg kind id drifted"); (void)DbgID;
  38
  39   // Create the 'tbaa' metadata kind.
  40   unsigned TBAAID = getMDKindID("tbaa");
  41   assert(TBAAID == MD_tbaa && "tbaa kind id drifted"); (void)TBAAID;
  42
  43   // Create the 'prof' metadata kind.
  44   unsigned ProfID = getMDKindID("prof");
  45   assert(ProfID == MD_prof && "prof kind id drifted"); (void)ProfID;
  46 }
  47 LLVMContext::~LLVMContext() { delete pImpl; }
  48
  49 void LLVMContext::addModule(Module *M) {
  50   pImpl->OwnedModules.insert(M);
  51 }
  52
  53 void LLVMContext::removeModule(Module *M) {
  54   pImpl->OwnedModules.erase(M);
  55 }
  56
  57 //===----------------------------------------------------------------------===//
  58 // Recoverable Backend Errors
  59 //===----------------------------------------------------------------------===//
  60
  61 void LLVMContext::
  62 setInlineAsmDiagnosticHandler(InlineAsmDiagHandlerTy DiagHandler,
  63                               void *DiagContext) {
  64   pImpl->InlineAsmDiagHandler = DiagHandler;
  65   pImpl->InlineAsmDiagContext = DiagContext;
  66 }
  67
  68 /// getInlineAsmDiagnosticHandler - Return the diagnostic handler set by
  69 /// setInlineAsmDiagnosticHandler.
  70 LLVMContext::InlineAsmDiagHandlerTy
  71 LLVMContext::getInlineAsmDiagnosticHandler() const {
  72   return pImpl->InlineAsmDiagHandler;
  73 }
  74
  75 /// getInlineAsmDiagnosticContext - Return the diagnostic context set by
  76 /// setInlineAsmDiagnosticHandler.
  77 void *LLVMContext::getInlineAsmDiagnosticContext() const {
  78   return pImpl->InlineAsmDiagContext;
  79 }
  80
  81 void LLVMContext::emitError(StringRef ErrorStr) {
  82   emitError(0U, ErrorStr);
  83 }
  84
  85 void LLVMContext::emitError(const Instruction *I, StringRef ErrorStr) {
  86   unsigned LocCookie = 0;
  87   if (const MDNode *SrcLoc = I->getMetadata("srcloc")) {
  88     if (SrcLoc->getNumOperands() != 0)
  89       if (const ConstantInt *CI = dyn_cast<ConstantInt>(SrcLoc->getOperand(0)))
  90         LocCookie = CI->getZExtValue();
  91   }
  92   return emitError(LocCookie, ErrorStr);
  93 }
  94
  95 void LLVMContext::emitError(unsigned LocCookie, StringRef ErrorStr) {
  96   // If there is no error handler installed, just print the error and exit.
  97   if (pImpl->InlineAsmDiagHandler == 0) {
  98     errs() << "error: " << ErrorStr << "\n";
  99     exit(1);
 100   }
 101
 102   // If we do have an error handler, we can report the error and keep going.
 103   SMDiagnostic Diag("", "error: " + ErrorStr.str());
 104
 105   pImpl->InlineAsmDiagHandler(Diag, pImpl->InlineAsmDiagContext, LocCookie);
 106 }
 107
 108 //===----------------------------------------------------------------------===//
 109 // Metadata Kind Uniquing
 110 //===----------------------------------------------------------------------===//
 111
 112 #ifndef NDEBUG
 113 /// isValidName - Return true if Name is a valid custom metadata handler name.
 114 static bool isValidName(StringRef MDName) {
 115   if (MDName.empty())
 116     return false;
 117
 118   if (!std::isalpha(MDName[0]))
 119     return false;
 120
 121   for (StringRef::iterator I = MDName.begin() + 1, E = MDName.end(); I != E;
 122        ++I) {
 123     if (!std::isalnum(*I) && *I != '_' && *I != '-' && *I != '.')
 124       return false;
 125   }
 126   return true;
 127 }
 128 #endif
 129
 130 /// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
 131 unsigned LLVMContext::getMDKindID(StringRef Name) const {
 132   assert(isValidName(Name) && "Invalid MDNode name");
 133
 134   // If this is new, assign it its ID.
 135   return
 136     pImpl->CustomMDKindNames.GetOrCreateValue(
 137       Name, pImpl->CustomMDKindNames.size()).second;
 138 }
 139
 140 /// getHandlerNames - Populate client supplied smallvector using custome
 141 /// metadata name and ID.
 142 void LLVMContext::getMDKindNames(SmallVectorImpl<StringRef> &Names) const {
 143   Names.resize(pImpl->CustomMDKindNames.size());
 144   for (StringMap<unsigned>::const_iterator I = pImpl->CustomMDKindNames.begin(),
 145        E = pImpl->CustomMDKindNames.end(); I != E; ++I)
 146     Names[I->second] = I->first();
 147 }