llvm-cov: Clean up some redundancy in the view API (NFC)

This removes the need to pass a starting and ending line when creating
a SourceCoverageView, since these are easy to determine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217746 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-cov/CodeCoverage.cpp

@@ -283,8 +283,7 @@ void CodeCoverageTool::createExpansionSubView(
   if (!SourceBuffer)
     return;
   auto SubView = llvm::make_unique<SourceCoverageView>(
-      SourceBuffer.get(), Parent.getOptions(), ExpandedLines.first,
-      ExpandedLines.second, ExpandedRegion);
+      SourceBuffer.get(), Parent.getOptions(), ExpandedRegion);
   SourceCoverageDataManager RegionManager;
   for (const auto &CR : Function.CountedRegions) {
     if (CR.FileID == ExpandedRegion.ExpandedFileID)
@@ -362,13 +361,9 @@ bool CodeCoverageTool::createSourceFileView(
   for (const auto &InstantiationSet : InstantiationSetCollector) {
     if (InstantiationSet.second.size() < 2)
       continue;
-    auto InterestingRange = findExpandedFileInterestingLineRange(
-        InstantiationSet.second.front()->CountedRegions.front().FileID,
-        *InstantiationSet.second.front());
     for (auto Function : InstantiationSet.second) {
-      auto SubView = llvm::make_unique<SourceCoverageView>(
-          View, InterestingRange.first, InterestingRange.second,
-          Function->Name);
+      auto SubView =
+          llvm::make_unique<SourceCoverageView>(View, Function->Name);
       createInstantiationSubView(SourceFile, *Function, *SubView);
       View.addChild(std::move(SubView));
     }
@@ -618,9 +613,7 @@ int CodeCoverageTool::show(int argc, const char **argv,
       auto SourceBuffer = getSourceFile(SourceFile);
       if (!SourceBuffer)
         return 1;
-      auto Range = findExpandedFileInterestingLineRange(MainFileID, Function);
-      SourceCoverageView mainView(SourceBuffer.get(), ViewOpts, Range.first,
-                                  Range.second);
+      SourceCoverageView mainView(SourceBuffer.get(), ViewOpts);
       createSourceFileView(SourceFile, mainView, Function, true);
       ViewOpts.colored_ostream(outs(), raw_ostream::CYAN)
           << Function.Name << " from " << SourceFile << ":";

tools/llvm-cov/SourceCoverageView.cpp

@@ -220,7 +220,7 @@ void SourceCoverageView::render(raw_ostream &OS, unsigned Offset) {
 
   line_iterator Lines(File);
   // Advance the line iterator to the first line.
-  while (Lines.line_number() < LineStart)
+  while (Lines.line_number() < LineOffset)
     ++Lines;
 
   // The width of the leading columns
@@ -231,8 +231,8 @@ void SourceCoverageView::render(raw_ostream &OS, unsigned Offset) {
   // subviews.
   unsigned DividerWidth = CombinedColumnWidth + 4;
 
-  for (size_t I = 0; I < LineCount; ++I) {
-    unsigned LineNo = I + LineStart;
+  for (size_t I = 0, E = LineStats.size(); I < E; ++I) {
+    unsigned LineNo = I + LineOffset;
 
     // Gather the child subviews that are visible on this line.
     auto LineSubViews = gatherLineSubViews(CurrentChild, Children, LineNo);
@@ -318,18 +318,25 @@ void SourceCoverageView::render(raw_ostream &OS, unsigned Offset) {
 
 void
 SourceCoverageView::createLineCoverageInfo(SourceCoverageDataManager &Data) {
-  LineStats.resize(LineCount);
-  for (const auto &CR : Data.getSourceRegions()) {
+  auto CountedRegions = Data.getSourceRegions();
+  if (!CountedRegions.size())
+    return;
+
+  LineOffset = CountedRegions.front().LineStart;
+  LineStats.resize(CountedRegions.front().LineEnd - LineOffset + 1);
+  for (const auto &CR : CountedRegions) {
+    if (CR.LineEnd > LineStats.size())
+      LineStats.resize(CR.LineEnd - LineOffset + 1);
     if (CR.Kind == coverage::CounterMappingRegion::SkippedRegion) {
       // Reset the line stats for skipped regions.
       for (unsigned Line = CR.LineStart; Line <= CR.LineEnd;
            ++Line)
-        LineStats[Line - LineStart] = LineCoverageInfo();
+        LineStats[Line - LineOffset] = LineCoverageInfo();
       continue;
     }
-    LineStats[CR.LineStart - LineStart].addRegionStartCount(CR.ExecutionCount);
+    LineStats[CR.LineStart - LineOffset].addRegionStartCount(CR.ExecutionCount);
     for (unsigned Line = CR.LineStart + 1; Line <= CR.LineEnd; ++Line)
-      LineStats[Line - LineStart].addRegionCount(CR.ExecutionCount);
+      LineStats[Line - LineOffset].addRegionCount(CR.ExecutionCount);
   }
 }
 
@@ -384,13 +391,10 @@ SourceCoverageView::createHighlightRanges(SourceCoverageDataManager &Data) {
 }
 
 void SourceCoverageView::createRegionMarkers(SourceCoverageDataManager &Data) {
-  for (const auto &CR : Data.getSourceRegions()) {
-    if (CR.Kind == coverage::CounterMappingRegion::SkippedRegion)
-      continue;
-    if (CR.LineStart >= LineStart)
+  for (const auto &CR : Data.getSourceRegions())
+    if (CR.Kind != coverage::CounterMappingRegion::SkippedRegion)
       Markers.push_back(
           RegionMarker(CR.LineStart, CR.ColumnStart, CR.ExecutionCount));
-  }
 
   if (Options.Debug) {
     for (const auto &Marker : Markers) {

tools/llvm-cov/SourceCoverageView.h

@@ -110,7 +110,7 @@ public:
 private:
   const MemoryBuffer &File;
   const CoverageViewOptions &Options;
-  unsigned LineStart, LineCount;
+  unsigned LineOffset;
   SubViewKind Kind;
   coverage::CounterMappingRegion ExpansionRegion;
   std::vector<std::unique_ptr<SourceCoverageView>> Children;
@@ -157,31 +157,19 @@ private:
 public:
   SourceCoverageView(const MemoryBuffer &File,
                      const CoverageViewOptions &Options)
-      : File(File), Options(Options), LineStart(1), Kind(View),
-        ExpansionRegion(coverage::Counter(), 0, 0, 0, 0, 0) {
-    LineCount = File.getBuffer().count('\n') + 1;
-  }
-
-  SourceCoverageView(const MemoryBuffer &File,
-                     const CoverageViewOptions &Options, unsigned LineStart,
-                     unsigned LineEnd)
-      : File(File), Options(Options), LineStart(LineStart),
-        LineCount(LineEnd - LineStart + 1), Kind(View),
+      : File(File), Options(Options), LineOffset(0), Kind(View),
         ExpansionRegion(coverage::Counter(), 0, 0, 0, 0, 0) {}
 
-  SourceCoverageView(SourceCoverageView &Parent, unsigned LineStart,
-                     unsigned LineEnd, StringRef FunctionName)
-      : File(Parent.File), Options(Parent.Options), LineStart(LineStart),
-        LineCount(LineEnd - LineStart + 1), Kind(InstantiationView),
-        ExpansionRegion(coverage::Counter(), 0, LineEnd, 0, LineEnd, 0),
+  SourceCoverageView(SourceCoverageView &Parent, StringRef FunctionName)
+      : File(Parent.File), Options(Parent.Options), LineOffset(0),
+        Kind(InstantiationView),
+        ExpansionRegion(coverage::Counter(), 0, 0, 0, 0, 0),
         FunctionName(FunctionName) {}
 
   SourceCoverageView(const MemoryBuffer &File,
-                     const CoverageViewOptions &Options, unsigned LineStart,
-                     unsigned LineEnd,
+                     const CoverageViewOptions &Options,
                      const coverage::CounterMappingRegion &ExpansionRegion)
-      : File(File), Options(Options), LineStart(LineStart),
-        LineCount(LineEnd - LineStart + 1), Kind(ExpansionView),
+      : File(File), Options(Options), LineOffset(0), Kind(ExpansionView),
         ExpansionRegion(ExpansionRegion) {}
 
   const CoverageViewOptions &getOptions() const { return Options; }