[sancov] using md5 for anchors in attempt to reduce file size.

[aizatsky]

format

[kcc]

+vitaly
LG to me

test/tools/sancov/html-report.test

 REQUIRES: x86_64-linux
 RUN: sancov -html-report %p/Inputs/test-linux_x86_64 %p/Inputs/test-linux_x86_64.0.sancov | FileCheck %s
 
 // It's very difficult to test html report. Do basic smoke check.
-CHECK: {{<a name=".*/Inputs/test.cpp">}}
+CHECK: {{.*/Inputs/test.cpp}}
 

tools/sancov/sancov.cc

 #include "llvm/Object/ELFObjectFile.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Errc.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/LineIterator.h"
+#include "llvm/Support/MD5.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Regex.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/SpecialCaseList.h"
 #include "llvm/Support/TargetRegistry.h"
for (char Ch : S) {
     default:
       Result.push_back(Ch);
       break;
     }
   }
   return Result;
 }
 
+static std::string anchorName(std::string Anchor) {
+  llvm::MD5 Hasher;
+  llvm::MD5::MD5Result Hash;
+  Hasher.update(Anchor);
+  Hasher.final(Hash);
+
+  SmallString<32> HexString;
+  llvm::MD5::stringifyResult(Hash, HexString);
+  return HexString.str().str();
+}
+
 static ErrorOr<bool> isCoverageFile(std::string FileName) {
   ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
       MemoryBuffer::getFile(FileName);
   if (!BufOrErr)
     return BufOrErr.getError();
   std::unique_ptr<MemoryBuffer> Buf = std::move(BufOrErr.get());
   if (Buf->getBufferSize() < 8) {
     return false;
void printReport(raw_ostream &OS) const {
     for (auto FileName : Files) {
       std::pair<size_t, size_t> FC = FileFnCoverage[FileName];
       if (FC.first == 0) {
         NotCoveredFilesCount++;
         continue;
       }
       size_t CovPct = FC.second == 0 ? 100 : 100 * FC.first / FC.second;
 
-      OS << "<tr><td><a href=\"#" << escapeHtml(FileName) << "\">"
+      OS << "<tr><td><a href=\"#" << anchorName(FileName) << "\">"
          << stripPathPrefix(FileName) << "</a></td>"
          << "<td>" << CovPct << "%</td>"
          << "<td>" << FC.first << " (" << FC.second << ")"
          << "</tr>\n";
     }
     OS << "</table>\n";
     OS << "</details>\n";
 
if (NotCoveredFilesCount) {
       OS << "<p>Congratulations! All source files are touched.</p>\n";
     }
 
     // Source
     for (auto FileName : Files) {
       std::pair<size_t, size_t> FC = FileFnCoverage[FileName];
       if (FC.first == 0)
         continue;
-      OS << "<a name=\"" << escapeHtml(FileName) << "\"></a>\n";
+      OS << "<a name=\"" << anchorName(FileName) << "\"></a>\n";
       OS << "<h2>" << stripPathPrefix(FileName) << "</h2>\n";
 
       auto NotCoveredFns = NotCoveredFnMap.find(FileName);
       if (NotCoveredFns != NotCoveredFnMap.end()) {
         OS << "<details open><summary>Not Covered Functions</summary>";
         OS << "<table>\n";
         for (auto FileFn : NotCoveredFns->second) {
           OS << "<tr><td>";
           OS << "<a href=\"#"
-             << escapeHtml(FileName + "::" + FileFn.FunctionName) << "\">";
+             << anchorName(FileName + "::" + FileFn.FunctionName) << "\">";
           OS << escapeHtml(FileFn.FunctionName) << "</a>";
           OS << "</td></tr>\n";
         }
         OS << "</table></details>\n";
       }
 
       ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
           MemoryBuffer::getFile(FileName);
for (auto FileName : Files) {
       for (line_iterator I = line_iterator(*BufOrErr.get(), false);
            !I.is_at_eof(); ++I) {
         uint32_t Line = I.line_number();
         { // generate anchors (if any);
           FileLoc Loc = FileLoc{FileName, Line};
           auto It = NotCoveredFnByLoc.find(Loc);
           if (It != NotCoveredFnByLoc.end()) {
             for (std::string Fn : It->second) {
-              OS << "<a name=\"" << escapeHtml(FileName + "::" + Fn)
+              OS << "<a name=\"" << anchorName(FileName + "::" + Fn)
                  << "\"></a>";
             };
           }
         }
 
         OS << "<span ";
         auto LIT = LineStatuses.find(I.line_number());
         auto Status = (LIT != LineStatuses.end()) ? LIT->second
void printReport(raw_ostream &OS) const {
     OS << "<body>\n";
 
     // Title
     OS << "<h1>" << Title << "</h1>\n";
 
     // Modules TOC.
     if (Coverage.size() > 1) {
       for (const auto &CovData : Coverage) {
-        OS << "<li><a href=\"#module_" << escapeHtml(CovData->object_file())
+        OS << "<li><a href=\"#module_" << anchorName(CovData->object_file())
            << "\">" << llvm::sys::path::filename(CovData->object_file())
            << "</a></li>\n";
       }
     }
 
     for (const auto &CovData : Coverage) {
       if (Coverage.size() > 1) {
         OS << "<h2>" << llvm::sys::path::filename(CovData->object_file())
            << "</h2>\n";
       }
-      OS << "<a name=\"module_" << escapeHtml(CovData->object_file())
+      OS << "<a name=\"module_" << anchorName(CovData->object_file())
          << "\"></a>\n";
       CovData->printReport(OS);
     }
 
     // About
     OS << "<details><summary>About</summary>\n";
     OS << "Coverage files:<ul>";
     for (auto InputFile : CoverageFiles) {