[llvm-cov] Implement -ignore-filename-regex= option for excluding source files.

Summary:
The option is helpful for large projects where it's not feasible to specify sources which
user would like to see in the report. Instead, it allows to black-list specific sources via
regular expressions (e.g. now it's possible to skip all files that have "test" in its name).

This also partially fixes https://bugs.llvm.org/show_bug.cgi?id=34277

Reviewers: vsk, morehouse, liaoyuke

Reviewed By: vsk

Subscribers: kcc, mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D43907

llvm-svn: 329581

1 files changed, 8 insertions, 5 deletions

diff --git a/llvm/tools/llvm-cov/CoverageExporterJson.cpp b/llvm/tools/llvm-cov/CoverageExporterJson.cpp
index 3621f9ab97f..fc631ac6d83 100644
--- a/llvm/tools/llvm-cov/CoverageExporterJson.cpp
+++ b/llvm/tools/llvm-cov/CoverageExporterJson.cpp
@@ -117,10 +117,13 @@ void CoverageExporterJson::emitArrayEnd() {
   OS << "]";
 }
 
-void CoverageExporterJson::renderRoot() {
+void CoverageExporterJson::renderRoot(
+    const CoverageFilters &IgnoreFilenameFilters) {
   std::vector<std::string> SourceFiles;
-  for (StringRef SF : Coverage.getUniqueSourceFiles())
-    SourceFiles.emplace_back(SF);
+  for (StringRef SF : Coverage.getUniqueSourceFiles()) {
+    if (!IgnoreFilenameFilters.matchesFilename(SF))
+      SourceFiles.emplace_back(SF);
+  }
   renderRoot(SourceFiles);
 }
 
@@ -218,11 +221,11 @@ void CoverageExporterJson::renderFiles(
 
 void CoverageExporterJson::renderFile(const std::string &Filename,
                                       const FileCoverageSummary &FileReport) {
-   // Start File.
+  // Start File.
   emitDictStart();
 
   emitDictElement("filename", Filename);
-  
+
   if (!Options.ExportSummaryOnly) {
     // Calculate and render detailed coverage information for given file.
     auto FileCoverage = Coverage.getCoverageForFile(Filename);