Revert "[llvm-cov] don't include all source files when provided source files are filtered out"

This reverts commit c2bd20ef652 and the follow up fix 16605bba6fb.

The tools/llvm-cov/warnings.h continues to fail on Windows platforms even
after the follow up, for example on the llvm-clang-win-x-armv7l builder:

    http://lab.llvm.org:8011/#/builders/60/builds/94

test/tools/llvm-cov/native_separators.c

@@ -8,7 +8,7 @@
 // RUN: llvm-profdata merge %S/Inputs/double_dots.proftext -o %t.profdata
 // RUN: llvm-cov show %S/Inputs/native_separators.covmapping -instr-profile=%t.profdata -o %t.dir
 // RUN: FileCheck -check-prefixes=TEXT-INDEX -input-file=%t.dir/index.txt %s
-// RUN: llvm-cov show -format=html %S/Inputs/native_separators.covmapping -instr-profile=%t.profdata -path-equivalence=/tmp,%S %S/../llvm-"config"/../llvm-"cov"/native_separators.c -o %t.dir
+// RUN: llvm-cov show -format=html %S/Inputs/native_separators.covmapping -instr-profile=%t.profdata -path-equivalence=/tmp,%S ../llvm-"config"/../llvm-"cov"/native_separators.c -o %t.dir
 // RUN: FileCheck -check-prefixes=HTML-INDEX -input-file=%t.dir/index.html %s
 // RUN: llvm-cov show -format=html %S/Inputs/native_separators.covmapping -instr-profile=%t.profdata -path-equivalence=/tmp,%S %s -o %t.dir
 // RUN: FileCheck -check-prefixes=HTML -input-file=%t.dir/coverage/tmp/native_separators.c.html %s

test/tools/llvm-cov/sources-specified.test

@@ -10,18 +10,6 @@ RUN:   %S/Inputs/sources_specified/main.covmapping \
 RUN:   %S/Inputs/sources_specified/main.cc %S/Inputs/sources_specified/extra \
 RUN:   | FileCheck -check-prefix=SHOW %s
 
-# Don't include all source files when provided source files are filtered out.
-RUN: llvm-cov show -instr-profile %S/Inputs/sources_specified/main.profdata \
-RUN:   -path-equivalence=/tmp,%S/Inputs \
-RUN:   %S/Inputs/sources_specified/main.covmapping \
-RUN:   --ignore-filename-regex='.*' \
-RUN:   %S/Inputs/sources_specified/main.cc %S/Inputs/sources_specified/extra \
-RUN:   | FileCheck -allow-empty -check-prefix=IGNORE %s
-
-IGNORE-NOT: {{.*}}main.cc{{.*}}
-IGNORE-NOT: {{.*}}inc.h{{.*}}
-IGNORE-NOT: {{.*}}dec.h{{.*}}
-
 # Order of files may differ, check the total values calculated.
 REPORT-NOT: {{.*}}abs.h{{.*}}
 REPORT: {{^}}TOTAL 3{{.*}}72.73%

test/tools/llvm-cov/universal_bin_wrapping_archives.test

@@ -17,11 +17,11 @@ REQUIRES: zlib
 RUN: llvm-profdata merge %S/Inputs/universal_bin_wrapping_archives/universal_bin_wrapping_archives.proftext -o %t.profdata
 
 RUN: llvm-cov show %S/Inputs/universal_bin_wrapping_archives/universal_bin_wrapping_archives \
-RUN:   -instr-profile %t.profdata -path-equivalence=/tmp,%S/Inputs/universal_bin_wrapping_archives -arch i386 \
+RUN:   -instr-profile %t.profdata -path-equivalence=/tmp,%S/Inputs/universal_bin_wrapping_archives %s -arch i386 \
 RUN:   | FileCheck %s --check-prefix=SHOW_ARCHIVE
 
 RUN: llvm-cov show %S/Inputs/universal_bin_wrapping_archives/universal_bin_wrapping_archives \
-RUN:   -instr-profile %t.profdata -path-equivalence=/tmp,%S/Inputs/universal_bin_wrapping_archives -arch x86_64 \
+RUN:   -instr-profile %t.profdata -path-equivalence=/tmp,%S/Inputs/universal_bin_wrapping_archives %s -arch x86_64 \
 RUN:   | FileCheck %s --check-prefix=SHOW_ARCHIVE
 
 SHOW_ARCHIVE: {{.*}}obj1.c:

test/tools/llvm-cov/warnings.h

@@ -1,13 +1,13 @@
-// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S | FileCheck %s -allow-empty -check-prefix=FAKE-FILE-STDOUT
+// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S /dev/null | FileCheck %s -allow-empty -check-prefix=FAKE-FILE-STDOUT
-// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S 2>&1 | FileCheck %s -check-prefix=FAKE-FILE-STDERR
+// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S /dev/null 2>&1 | FileCheck %s -check-prefix=FAKE-FILE-STDERR
 // RUN: not llvm-cov report %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -format=html
 // RUN: not llvm-cov export %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -format=html
 
 // FAKE-FILE-STDOUT-NOT: warning: The file '{{.*}}' isn't covered.
 // FAKE-FILE-STDERR: warning: The file '{{.*}}' isn't covered.
 
-// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S -name ".*" | FileCheck %s -allow-empty -check-prefix=FAKE-FUNC-STDOUT
+// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S -name ".*" /dev/null | FileCheck %s -allow-empty -check-prefix=FAKE-FUNC-STDOUT
-// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S -name-regex ".*" 2>&1 | FileCheck %s -check-prefix=FAKE-FUNC-STDERR
+// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S -name-regex ".*" /dev/null 2>&1 | FileCheck %s -check-prefix=FAKE-FUNC-STDERR
 
 // FAKE-FUNC-STDOUT-NOT: warning: Could not read coverage for '{{.*}}'.
 // FAKE-FUNC-STDERR: Could not read coverage for '{{.*}}'.

tools/llvm-cov/CodeCoverage.cpp

@@ -130,9 +130,6 @@ private:
   CoverageFiltersMatchAll Filters;
   CoverageFilters IgnoreFilenameFilters;
 
-  /// True if InputSourceFiles are provided.
-  bool HadSourceFiles = false;
-
   /// The path to the indexed profile.
   std::string PGOFilename;
 
@@ -197,7 +194,6 @@ void CodeCoverageTool::addCollectedPath(const std::string &Path) {
   sys::path::remove_dots(EffectivePath, /*remove_dot_dots=*/true);
   if (!IgnoreFilenameFilters.matchesFilename(EffectivePath))
     SourceFiles.emplace_back(EffectivePath.str());
-  HadSourceFiles = !SourceFiles.empty();
 }
 
 void CodeCoverageTool::collectPaths(const std::string &Path) {
@@ -401,7 +397,6 @@ void CodeCoverageTool::remapPathNames(const CoverageMapping &Coverage) {
     sys::path::native(Path, NativePath);
     if (!sys::path::is_separator(NativePath.back()))
       NativePath += sys::path::get_separator();
-    sys::path::remove_dots(NativePath, true);
     return NativePath.c_str();
   };
   std::string RemapFrom = nativeWithTrailing(PathRemapping->first);
@@ -411,7 +406,6 @@ void CodeCoverageTool::remapPathNames(const CoverageMapping &Coverage) {
   for (StringRef Filename : Coverage.getUniqueSourceFiles()) {
     SmallString<128> NativeFilename;
     sys::path::native(Filename, NativeFilename);
-    sys::path::remove_dots(NativeFilename, true);
     if (NativeFilename.startswith(RemapFrom)) {
       RemappedFilenames[Filename] =
           RemapTo + NativeFilename.substr(RemapFrom.size()).str();
@@ -901,7 +895,7 @@ int CodeCoverageTool::doShow(int argc, const char **argv,
 
   auto Printer = CoveragePrinter::create(ViewOpts);
 
-  if (SourceFiles.empty() && !HadSourceFiles)
+  if (SourceFiles.empty())
     // Get the source files from the function coverage mapping.
     for (StringRef Filename : Coverage->getUniqueSourceFiles()) {
       if (!IgnoreFilenameFilters.matchesFilename(Filename))