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
57  // Create the 'tbaa.struct' metadata kind.
58  unsigned TBAAStructID = getMDKindID("tbaa.struct");
59  assert(TBAAStructID == MD_tbaa_struct && "tbaa.struct kind id drifted");
60  (void)TBAAStructID;
61}
62LLVMContext::~LLVMContext() { delete pImpl; }
63
64void LLVMContext::addModule(Module *M) {
65  pImpl->OwnedModules.insert(M);
66}
67
68void LLVMContext::removeModule(Module *M) {
69  pImpl->OwnedModules.erase(M);
70}
71
72//===----------------------------------------------------------------------===//
73// Recoverable Backend Errors
74//===----------------------------------------------------------------------===//
75
76void LLVMContext::
77setInlineAsmDiagnosticHandler(InlineAsmDiagHandlerTy DiagHandler,
78                              void *DiagContext) {
79  pImpl->InlineAsmDiagHandler = DiagHandler;
80  pImpl->InlineAsmDiagContext = DiagContext;
81}
82
83/// getInlineAsmDiagnosticHandler - Return the diagnostic handler set by
84/// setInlineAsmDiagnosticHandler.
85LLVMContext::InlineAsmDiagHandlerTy
86LLVMContext::getInlineAsmDiagnosticHandler() const {
87  return pImpl->InlineAsmDiagHandler;
88}
89
90/// getInlineAsmDiagnosticContext - Return the diagnostic context set by
91/// setInlineAsmDiagnosticHandler.
92void *LLVMContext::getInlineAsmDiagnosticContext() const {
93  return pImpl->InlineAsmDiagContext;
94}
95
96void LLVMContext::emitError(const Twine &ErrorStr) {
97  emitError(0U, ErrorStr);
98}
99
100void LLVMContext::emitError(const Instruction *I, const Twine &ErrorStr) {
101  unsigned LocCookie = 0;
102  if (const MDNode *SrcLoc = I->getMetadata("srcloc")) {
103    if (SrcLoc->getNumOperands() != 0)
104      if (const ConstantInt *CI = dyn_cast<ConstantInt>(SrcLoc->getOperand(0)))
105        LocCookie = CI->getZExtValue();
106  }
107  return emitError(LocCookie, ErrorStr);
108}
109
110void LLVMContext::emitError(unsigned LocCookie, const Twine &ErrorStr) {
111  // If there is no error handler installed, just print the error and exit.
112  if (pImpl->InlineAsmDiagHandler == 0) {
113    errs() << "error: " << ErrorStr << "\n";
114    exit(1);
115  }
116
117  // If we do have an error handler, we can report the error and keep going.
118  SMDiagnostic Diag("", SourceMgr::DK_Error, ErrorStr.str());
119
120  pImpl->InlineAsmDiagHandler(Diag, pImpl->InlineAsmDiagContext, LocCookie);
121}
122
123//===----------------------------------------------------------------------===//
124// Metadata Kind Uniquing
125//===----------------------------------------------------------------------===//
126
127#ifndef NDEBUG
128/// isValidName - Return true if Name is a valid custom metadata handler name.
129static bool isValidName(StringRef MDName) {
130  if (MDName.empty())
131    return false;
132
133  if (!std::isalpha(MDName[0]))
134    return false;
135
136  for (StringRef::iterator I = MDName.begin() + 1, E = MDName.end(); I != E;
137       ++I) {
138    if (!std::isalnum(*I) && *I != '_' && *I != '-' && *I != '.')
139      return false;
140  }
141  return true;
142}
143#endif
144
145/// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
146unsigned LLVMContext::getMDKindID(StringRef Name) const {
147  assert(isValidName(Name) && "Invalid MDNode name");
148
149  // If this is new, assign it its ID.
150  return
151    pImpl->CustomMDKindNames.GetOrCreateValue(
152      Name, pImpl->CustomMDKindNames.size()).second;
153}
154
155/// getHandlerNames - Populate client supplied smallvector using custome
156/// metadata name and ID.
157void LLVMContext::getMDKindNames(SmallVectorImpl<StringRef> &Names) const {
158  Names.resize(pImpl->CustomMDKindNames.size());
159  for (StringMap<unsigned>::const_iterator I = pImpl->CustomMDKindNames.begin(),
160       E = pImpl->CustomMDKindNames.end(); I != E; ++I)
161    Names[I->second] = I->first();
162}
163