GCOV.cpp revision 12e90cb69a0a39d0db208de98162e39a2e3d6d1e 
1//===- GCOVr.cpp - LLVM coverage tool -------------------------------------===//
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// GCOV implements the interface to read and write coverage files that use
11// 'gcov' format.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/Support/Debug.h"
16#include "llvm/Support/GCOV.h"
17#include "llvm/ADT/OwningPtr.h"
18#include "llvm/ADT/STLExtras.h"
19#include "llvm/Support/Format.h"
20#include "llvm/Support/MemoryObject.h"
21#include "llvm/Support/system_error.h"
22using namespace llvm;
23
24//===----------------------------------------------------------------------===//
25// GCOVFile implementation.
26
27/// ~GCOVFile - Delete GCOVFile and its content.
28GCOVFile::~GCOVFile() {
29  DeleteContainerPointers(Functions);
30}
31
32/// isGCDAFile - Return true if Format identifies a .gcda file.
33static bool isGCDAFile(GCOV::GCOVFormat Format) {
34  return Format == GCOV::GCDA_402 || Format == GCOV::GCDA_404;
35}
36
37/// isGCNOFile - Return true if Format identifies a .gcno file.
38static bool isGCNOFile(GCOV::GCOVFormat Format) {
39  return Format == GCOV::GCNO_402 || Format == GCOV::GCNO_404;
40}
41
42/// read - Read GCOV buffer.
43bool GCOVFile::read(GCOVBuffer &Buffer) {
44  GCOV::GCOVFormat Format = Buffer.readGCOVFormat();
45  if (Format == GCOV::InvalidGCOV)
46    return false;
47
48  if (isGCNOFile(Format)) {
49    while (true) {
50      if (!Buffer.readFunctionTag()) break;
51      GCOVFunction *GFun = new GCOVFunction();
52      if (!GFun->read(Buffer, Format))
53        return false;
54      Functions.push_back(GFun);
55    }
56  }
57  else if (isGCDAFile(Format)) {
58    for (size_t i = 0, e = Functions.size(); i < e; ++i) {
59      if (!Buffer.readFunctionTag()) {
60        errs() << "Unexpected number of functions.\n";
61        return false;
62      }
63      if (!Functions[i]->read(Buffer, Format))
64        return false;
65    }
66    if (Buffer.readObjectTag()) {
67      uint32_t Length;
68      uint32_t Dummy;
69      if (!Buffer.readInt(Length)) return false;
70      if (!Buffer.readInt(Dummy)) return false; // checksum
71      if (!Buffer.readInt(Dummy)) return false; // num
72      if (!Buffer.readInt(RunCount)) return false;;
73      Buffer.advanceCursor(Length-3);
74    }
75    while (Buffer.readProgramTag()) {
76      uint32_t Length;
77      if (!Buffer.readInt(Length)) return false;
78      Buffer.advanceCursor(Length);
79      ++ProgramCount;
80    }
81  }
82
83  return true;
84}
85
86/// dump - Dump GCOVFile content to dbgs() for debugging purposes.
87void GCOVFile::dump() {
88  for (SmallVectorImpl<GCOVFunction *>::iterator I = Functions.begin(),
89         E = Functions.end(); I != E; ++I)
90    (*I)->dump();
91}
92
93/// collectLineCounts - Collect line counts. This must be used after
94/// reading .gcno and .gcda files.
95void GCOVFile::collectLineCounts(FileInfo &FI) {
96  for (SmallVectorImpl<GCOVFunction *>::iterator I = Functions.begin(),
97         E = Functions.end(); I != E; ++I)
98    (*I)->collectLineCounts(FI);
99  FI.setRunCount(RunCount);
100  FI.setProgramCount(ProgramCount);
101}
102
103//===----------------------------------------------------------------------===//
104// GCOVFunction implementation.
105
106/// ~GCOVFunction - Delete GCOVFunction and its content.
107GCOVFunction::~GCOVFunction() {
108  DeleteContainerPointers(Blocks);
109}
110
111/// read - Read a function from the buffer. Return false if buffer cursor
112/// does not point to a function tag.
113bool GCOVFunction::read(GCOVBuffer &Buff, GCOV::GCOVFormat Format) {
114  uint32_t Dummy;
115  if (!Buff.readInt(Dummy)) return false; // Function header length
116  if (!Buff.readInt(Ident)) return false;
117  if (!Buff.readInt(Dummy)) return false; // Checksum #1
118  if (Format != GCOV::GCNO_402 && Format != GCOV::GCDA_402)
119    if (!Buff.readInt(Dummy)) return false; // Checksum #2
120
121  if (!Buff.readString(Name)) return false;
122
123  if (Format == GCOV::GCNO_402 || Format == GCOV::GCNO_404)
124    if (!Buff.readString(Filename)) return false;
125
126  if (Format == GCOV::GCDA_402 || Format == GCOV::GCDA_404) {
127    if (!Buff.readArcTag()) {
128      errs() << "Arc tag not found.\n";
129      return false;
130    }
131    uint32_t Count;
132    if (!Buff.readInt(Count)) return false;
133    Count /= 2;
134
135    // This for loop adds the counts for each block. A second nested loop is
136    // required to combine the edge counts that are contained in the GCDA file.
137    for (uint32_t Line = 0; Count > 0; ++Line) {
138      if (Line >= Blocks.size()) {
139        errs() << "Unexpected number of edges.\n";
140        return false;
141      }
142      GCOVBlock &Block = *Blocks[Line];
143      for (size_t Edge = 0, End = Block.getNumEdges(); Edge < End; ++Edge) {
144        if (Count == 0) {
145          errs() << "Unexpected number of edges.\n";
146          return false;
147        }
148        uint64_t ArcCount;
149        if (!Buff.readInt64(ArcCount)) return false;
150        Block.addCount(ArcCount);
151        --Count;
152      }
153    }
154    return true;
155  }
156
157  if (!Buff.readInt(LineNumber)) return false;
158
159  // read blocks.
160  if (!Buff.readBlockTag()) {
161    errs() << "Block tag not found.\n";
162    return false;
163  }
164  uint32_t BlockCount;
165  if (!Buff.readInt(BlockCount)) return false;
166  for (uint32_t i = 0, e = BlockCount; i != e; ++i) {
167    if (!Buff.readInt(Dummy)) return false; // Block flags;
168    Blocks.push_back(new GCOVBlock(*this, i));
169  }
170
171  // read edges.
172  while (Buff.readEdgeTag()) {
173    uint32_t EdgeCount;
174    if (!Buff.readInt(EdgeCount)) return false;
175    EdgeCount = (EdgeCount - 1) / 2;
176    uint32_t BlockNo;
177    if (!Buff.readInt(BlockNo)) return false;
178    if (BlockNo >= BlockCount) {
179      errs() << "Unexpected block number.\n";
180      return false;
181    }
182    for (uint32_t i = 0, e = EdgeCount; i != e; ++i) {
183      uint32_t Dst;
184      if (!Buff.readInt(Dst)) return false;
185      Blocks[BlockNo]->addEdge(Dst);
186      if (!Buff.readInt(Dummy)) return false; // Edge flag
187    }
188  }
189
190  // read line table.
191  while (Buff.readLineTag()) {
192    uint32_t LineTableLength;
193    if (!Buff.readInt(LineTableLength)) return false;
194    uint32_t EndPos = Buff.getCursor() + LineTableLength*4;
195    uint32_t BlockNo;
196    if (!Buff.readInt(BlockNo)) return false;
197    if (BlockNo >= BlockCount) {
198      errs() << "Unexpected block number.\n";
199      return false;
200    }
201    GCOVBlock *Block = Blocks[BlockNo];
202    if (!Buff.readInt(Dummy)) return false; // flag
203    while (Buff.getCursor() != (EndPos - 4)) {
204      StringRef F;
205      if (!Buff.readString(F)) return false;
206      if (F != Filename) {
207        errs() << "Multiple sources for a single basic block.\n";
208        return false;
209      }
210      if (Buff.getCursor() == (EndPos - 4)) break;
211      while (true) {
212        uint32_t Line;
213        if (!Buff.readInt(Line)) return false;
214        if (!Line) break;
215        Block->addLine(Line);
216      }
217    }
218    if (!Buff.readInt(Dummy)) return false; // flag
219  }
220  return true;
221}
222
223/// dump - Dump GCOVFunction content to dbgs() for debugging purposes.
224void GCOVFunction::dump() {
225  dbgs() <<  "===== " << Name << " @ " << Filename << ":" << LineNumber << "\n";
226  for (SmallVectorImpl<GCOVBlock *>::iterator I = Blocks.begin(),
227         E = Blocks.end(); I != E; ++I)
228    (*I)->dump();
229}
230
231/// collectLineCounts - Collect line counts. This must be used after
232/// reading .gcno and .gcda files.
233void GCOVFunction::collectLineCounts(FileInfo &FI) {
234  for (SmallVectorImpl<GCOVBlock *>::iterator I = Blocks.begin(),
235         E = Blocks.end(); I != E; ++I)
236    (*I)->collectLineCounts(FI);
237}
238
239//===----------------------------------------------------------------------===//
240// GCOVBlock implementation.
241
242/// ~GCOVBlock - Delete GCOVBlock and its content.
243GCOVBlock::~GCOVBlock() {
244  Edges.clear();
245  Lines.clear();
246}
247
248/// collectLineCounts - Collect line counts. This must be used after
249/// reading .gcno and .gcda files.
250void GCOVBlock::collectLineCounts(FileInfo &FI) {
251  for (SmallVectorImpl<uint32_t>::iterator I = Lines.begin(),
252         E = Lines.end(); I != E; ++I)
253    FI.addLineCount(Parent.getFilename(), *I, Counter);
254}
255
256/// dump - Dump GCOVBlock content to dbgs() for debugging purposes.
257void GCOVBlock::dump() {
258  dbgs() << "Block : " << Number << " Counter : " << Counter << "\n";
259  if (!Edges.empty()) {
260    dbgs() << "\tEdges : ";
261    for (SmallVectorImpl<uint32_t>::iterator I = Edges.begin(), E = Edges.end();
262         I != E; ++I)
263      dbgs() << (*I) << ",";
264    dbgs() << "\n";
265  }
266  if (!Lines.empty()) {
267    dbgs() << "\tLines : ";
268    for (SmallVectorImpl<uint32_t>::iterator I = Lines.begin(),
269           E = Lines.end(); I != E; ++I)
270      dbgs() << (*I) << ",";
271    dbgs() << "\n";
272  }
273}
274
275//===----------------------------------------------------------------------===//
276// FileInfo implementation.
277
278/// print -  Print source files with collected line count information.
279void FileInfo::print(raw_fd_ostream &OS, StringRef gcnoFile,
280                     StringRef gcdaFile) {
281  for (StringMap<LineCounts>::iterator I = LineInfo.begin(), E = LineInfo.end();
282       I != E; ++I) {
283    StringRef Filename = I->first();
284    OS << "        -:    0:Source:" << Filename << "\n";
285    OS << "        -:    0:Graph:" << gcnoFile << "\n";
286    OS << "        -:    0:Data:" << gcdaFile << "\n";
287    OS << "        -:    0:Runs:" << RunCount << "\n";
288    OS << "        -:    0:Programs:" << ProgramCount << "\n";
289    LineCounts &L = LineInfo[Filename];
290    OwningPtr<MemoryBuffer> Buff;
291    if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
292      errs() << Filename << ": " << ec.message() << "\n";
293      return;
294    }
295    StringRef AllLines = Buff.take()->getBuffer();
296    uint32_t i = 0;
297    while (!AllLines.empty()) {
298      if (L.find(i) != L.end()) {
299        if (L[i] == 0)
300          OS << "    #####:";
301        else
302          OS << format("%9lu:", L[i]);
303      } else {
304        OS << "        -:";
305      }
306      std::pair<StringRef, StringRef> P = AllLines.split('\n');
307      if (AllLines != P.first)
308        OS << format("%5u:", i+1) << P.first;
309      OS << "\n";
310      AllLines = P.second;
311      ++i;
312    }
313  }
314}
315