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>
23using namespace llvm;
24
25static ManagedStatic<LLVMContext> GlobalContext;
26
27LLVMContext& llvm::getGlobalContext() {
28  return *GlobalContext;
29}
30
31LLVMContext::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  // Create the 'fpmath' metadata kind.
48  unsigned FPAccuracyID = getMDKindID("fpmath");
49  assert(FPAccuracyID == MD_fpmath && "fpmath kind id drifted");
50  (void)FPAccuracyID;
51
52  // Create the 'range' metadata kind.
53  unsigned RangeID = getMDKindID("range");
54  assert(RangeID == MD_range && "range kind id drifted");
55  (void)RangeID;
56}
57LLVMContext::~LLVMContext() { delete pImpl; }
58
59void LLVMContext::addModule(Module *M) {
60  pImpl->OwnedModules.insert(M);
61}
62
63void LLVMContext::removeModule(Module *M) {
64  pImpl->OwnedModules.erase(M);
65}
66
67//===----------------------------------------------------------------------===//
68// Recoverable Backend Errors
69//===----------------------------------------------------------------------===//
70
71void LLVMContext::
72setInlineAsmDiagnosticHandler(InlineAsmDiagHandlerTy DiagHandler,
73                              void *DiagContext) {
74  pImpl->InlineAsmDiagHandler = DiagHandler;
75  pImpl->InlineAsmDiagContext = DiagContext;
76}
77
78/// getInlineAsmDiagnosticHandler - Return the diagnostic handler set by
79/// setInlineAsmDiagnosticHandler.
80LLVMContext::InlineAsmDiagHandlerTy
81LLVMContext::getInlineAsmDiagnosticHandler() const {
82  return pImpl->InlineAsmDiagHandler;
83}
84
85/// getInlineAsmDiagnosticContext - Return the diagnostic context set by
86/// setInlineAsmDiagnosticHandler.
87void *LLVMContext::getInlineAsmDiagnosticContext() const {
88  return pImpl->InlineAsmDiagContext;
89}
90
91void LLVMContext::emitError(const Twine &ErrorStr) {
92  emitError(0U, ErrorStr);
93}
94
95void LLVMContext::emitError(const Instruction *I, const Twine &ErrorStr) {
96  unsigned LocCookie = 0;
97  if (const MDNode *SrcLoc = I->getMetadata("srcloc")) {
98    if (SrcLoc->getNumOperands() != 0)
99      if (const ConstantInt *CI = dyn_cast<ConstantInt>(SrcLoc->getOperand(0)))
100        LocCookie = CI->getZExtValue();
101  }
102  return emitError(LocCookie, ErrorStr);
103}
104
105void LLVMContext::emitError(unsigned LocCookie, const Twine &ErrorStr) {
106  // If there is no error handler installed, just print the error and exit.
107  if (pImpl->InlineAsmDiagHandler == 0) {
108    errs() << "error: " << ErrorStr << "\n";
109    exit(1);
110  }
111
112  // If we do have an error handler, we can report the error and keep going.
113  SMDiagnostic Diag("", SourceMgr::DK_Error, ErrorStr.str());
114
115  pImpl->InlineAsmDiagHandler(Diag, pImpl->InlineAsmDiagContext, LocCookie);
116}
117
118//===----------------------------------------------------------------------===//
119// Metadata Kind Uniquing
120//===----------------------------------------------------------------------===//
121
122#ifndef NDEBUG
123/// isValidName - Return true if Name is a valid custom metadata handler name.
124static bool isValidName(StringRef MDName) {
125  if (MDName.empty())
126    return false;
127
128  if (!std::isalpha(MDName[0]))
129    return false;
130
131  for (StringRef::iterator I = MDName.begin() + 1, E = MDName.end(); I != E;
132       ++I) {
133    if (!std::isalnum(*I) && *I != '_' && *I != '-' && *I != '.')
134      return false;
135  }
136  return true;
137}
138#endif
139
140/// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
141unsigned LLVMContext::getMDKindID(StringRef Name) const {
142  assert(isValidName(Name) && "Invalid MDNode name");
143
144  // If this is new, assign it its ID.
145  return
146    pImpl->CustomMDKindNames.GetOrCreateValue(
147      Name, pImpl->CustomMDKindNames.size()).second;
148}
149
150/// getHandlerNames - Populate client supplied smallvector using custome
151/// metadata name and ID.
152void LLVMContext::getMDKindNames(SmallVectorImpl<StringRef> &Names) const {
153  Names.resize(pImpl->CustomMDKindNames.size());
154  for (StringMap<unsigned>::const_iterator I = pImpl->CustomMDKindNames.begin(),
155       E = pImpl->CustomMDKindNames.end(); I != E; ++I)
156    Names[I->second] = I->first();
157}
158