[llvm-cov] Add an option which maps the location of source directories on another machine to your local copies

[seaneveson]

Summary

This patch adds the -path-equivalence option (example: llvm-cov show -path-equivalence=/origin/path,/local/path) which maps the source code path from one machine to another when using llvm-cov show. This is similar to the -filename-equivalence option, but doesn't require you to specify all the source files on the command line.

This allows you to generate the coverage data on one machine (e.g. in a CI system), and then use llvm-cov on another machine where you have the same code base on a different path.

[seaneveson]

Add missing file.

[vsk]

Thanks for the patch, this should address:
https://bugs.llvm.org/show_bug.cgi?id=30901

tools/llvm-cov/CodeCoverage.cpp

134

Please use Optional<std::pair<...>>, this will make it easier to see whether/not there is a remapping.

507–508

The path remap option is a strict improvement over -filename-equivalence. Could you delete the old option, delete CompareFilenamesOnly & any resulting dead code, and update any affected tests to use path remap?

596

I don't think that either of these paths need to go through native(). That should happen right before inserting into RemappedFilenames.

598

The field can just be initialized to None in the CodeCoverageTool constructor.

801

You should only need to call native() on the string Filename is mapped to.

809

Why should -path-equivalence be ignored if source files are specified? IMO this should be supported so that users can see coverage for a restricted set of files.

[seaneveson]

Update based on review comments.

[seaneveson]

Thanks for your feedback, I think I've addressed all your comments (or replied to them).

test/tools/llvm-cov/scan-directory.test

11

I'm not sure what the expected output should be now. The actual output is:

error: a: Missing source file
error: b: Missing source file
error: c: Missing source file
error: d: Missing source file
error: e: Missing source file
error: f: Missing source file
D:\Test\x\a\b\c.tmp
D:\Test\x\a\d.tmp

tools/llvm-cov/CodeCoverage.cpp

801

I think you do have to call native on both paths and the Filename to cover the case where the coverage data was generated on linux and llvm-cov is being run on windows (like in the lit tests).

Since the RemapFrom path and the Filename path are being compared it is important they are both native. Otherwise the RemapFrom path could be anything the user typed in, and we can't be sure about Filename because the data could come from another platform.

Given that the Filename path is then already native, it is quicker and easier to make RemapTo native and then just append the NativeFilename.

[vsk]

This is looking good, there's just one real issue left with removeUnmappedInputs().

test/tools/llvm-cov/scan-directory.test

11

I think "remapped-from" should be "%t" (all of the 'source files' live within that directory, see the first RUN line). The "remapped-to" field can be whatever you'd like.

tools/llvm-cov/CodeCoverage.cpp

127

Could you also remove the -filename-equivalance entry from docs/CommandGuide/llvm-cov.rst, and add in a short sentence or two about -path-equivalence?

355

This function must ensure that if a file outside of the coverage mapping is passed to llvm-cov (outside of -filename-equivalence mode), it does not get displayed. With your change, the !CompareFilenamesOnly branch is still correct (the condition would need to be changed to !PathRemapped). It's the other branch which is now wrong: you'll need to do a reverse mapping on the source files, and check that coverage mapping contains it.

801

Ok, sgtm.

[seaneveson]

• Address review comments
• Move the creation of the mapping into its own method, and call that inside load(), so it works properly for report as well as show

[vsk]

tools/llvm-cov/CodeCoverage.cpp

174–175

I don't think we need the PathRemapping check here (you can just keep the else branch). Otherwise, using relative paths in path equivalence mode won't work.

355

nit, extra 'to'

364

I don't see the need for this side table. It should be possible to do this without using any extra space:

std::remove_if(SourceFiles.begin(), SourceFiles.end(), [&](const std::string &filename) {
  if (filename.startswith(PathRemapping.second))
    inv_mapped_path = path::join(PathRemapping.first, full_path.drop_first(PathRemapping.second.size()))
  else
    inv_mapped_path = filename
  return !std::binary_search(CoveredFiles.begin(), CoveredFiles.end(), inv_mapped_path);
});

This might fit nicely in the previous call to remove_if().

366

I can see why 'remap-from' would be empty (the user wants to add a path prefix). It would also make sense if 'remap-to' were empty (the user wants to strip out a path prefix).

Maybe the emptiness check should be in nativeWithTrailing?

[seaneveson]

Address some review comments and tidy up removeUnmappedInputs.

[vsk]

It might be nice to find a simpler way to remove unmapped inputs, but that can certainly wait. LGTM, thanks again for working on this.

tools/llvm-cov/CodeCoverage.cpp

380

nit, 'input'

[seaneveson]

Fix typo and rebase.

test/tools/llvm-cov/Inputs/path_equivalence.proftext

+main
+# Func Hash:
+0
+# Num Counters:
+1
+# Counter Values:
+1
+

test/tools/llvm-cov/binary-formats.c

 // Checks for reading various formats.
 
 // CHECK: [[@LINE+1]]| 100|int main
 int main(int argc, const char *argv[]) {}
 
 // RUN: llvm-profdata merge %S/Inputs/binary-formats.proftext -o %t.profdata
-// RUN: llvm-cov show %S/Inputs/binary-formats.macho32l -instr-profile %t.profdata -filename-equivalence %s | FileCheck %s
-// RUN: llvm-cov show %S/Inputs/binary-formats.macho64l -instr-profile %t.profdata -filename-equivalence %s | FileCheck %s
-// RUN: llvm-cov show %S/Inputs/binary-formats.macho32b -instr-profile %t.profdata -filename-equivalence %s | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/binary-formats.macho32l -instr-profile %t.profdata -path-equivalence=/tmp,%S %s | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/binary-formats.macho64l -instr-profile %t.profdata -path-equivalence=/tmp,%S %s | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/binary-formats.macho32b -instr-profile %t.profdata -path-equivalence=/tmp,%S %s | FileCheck %s
 
 // RUN: llvm-cov export %S/Inputs/binary-formats.macho32l -instr-profile %t.profdata | FileCheck %S/Inputs/binary-formats.canonical.json
 // RUN: llvm-cov export %S/Inputs/binary-formats.macho64l -instr-profile %t.profdata | FileCheck %S/Inputs/binary-formats.canonical.json
 // RUN: llvm-cov export %S/Inputs/binary-formats.macho32b -instr-profile %t.profdata | FileCheck %S/Inputs/binary-formats.canonical.json

test/tools/llvm-cov/combine_expansions.cpp

 // Check that we combine expansion regions.
 
 // RUN: llvm-profdata merge %S/Inputs/combine_expansions.proftext -o %t.profdata
-// RUN: llvm-cov show %S/Inputs/combine_expansions.covmapping -instr-profile %t.profdata -filename-equivalence %s | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/combine_expansions.covmapping -instr-profile %t.profdata -path-equivalence=/tmp/ec,%S %s | FileCheck %s
 
 #define SIMPLE_OP \
   ++x
 // CHECK:      [[@LINE-2]]|  |#define SIMPLE_OP
 // CHECK-NEXT: [[@LINE-2]]| 2|  ++x
 
 #define DO_SOMETHING \
   {                  \

test/tools/llvm-cov/cov-comdat.test

 REQUIRES: shell
 
 # The binary contains two (merged) covmap sections which
 # have duplicate CovMapRecords from comdat (template instantation).
 # This test makes sure the reader reads it properly. It also
 # tests that the coverage data from different instantiations
 # of the same template function are properly merged in show
 # output.
 
-// RUN: llvm-cov show %S/Inputs/binary-formats.v1.linux64l -instr-profile %S/Inputs/elf_binary_comdat.profdata -filename-equivalence %S/Inputs/instrprof-comdat.h | FileCheck --check-prefix=HEADER %S/Inputs/instrprof-comdat.h
-// RUN: llvm-cov show %S/Inputs/binary-formats.v2.linux64l -instr-profile %S/Inputs/elf_binary_comdat.profdata -filename-equivalence %S/Inputs/instrprof-comdat.h | FileCheck --check-prefix=HEADER %S/Inputs/instrprof-comdat.h
-// RUN: llvm-cov show %S/Inputs/binary-formats.v2.linux32l -instr-profile %S/Inputs/elf_binary_comdat.profdata -filename-equivalence %S/Inputs/instrprof-comdat.h | FileCheck --check-prefix=HEADER %S/Inputs/instrprof-comdat.h
+// RUN: llvm-cov show %S/Inputs/binary-formats.v1.linux64l -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S/Inputs %S/Inputs/instrprof-comdat.h | FileCheck --check-prefix=HEADER %S/Inputs/instrprof-comdat.h
+// RUN: llvm-cov show %S/Inputs/binary-formats.v2.linux64l -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S/Inputs %S/Inputs/instrprof-comdat.h | FileCheck --check-prefix=HEADER %S/Inputs/instrprof-comdat.h
+// RUN: llvm-cov show %S/Inputs/binary-formats.v2.linux32l -instr-profile %S/Inputs/elf_binary_comdat.profdata -path-equivalence=/tmp,%S/Inputs %S/Inputs/instrprof-comdat.h | FileCheck --check-prefix=HEADER %S/Inputs/instrprof-comdat.h

test/tools/llvm-cov/demangle.test

-RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -Xdemangler sed -Xdemangler 's/_/X/g' -filename-equivalence %S/showTemplateInstantiations.cpp | FileCheck %s
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -Xdemangler sed -Xdemangler 's/_/X/g' -path-equivalence=/tmp,%S %S/showTemplateInstantiations.cpp | FileCheck %s
 
 // Check that we demangle names even if the sub-view will be hidden.
 RUN: llvm-profdata merge %S/Inputs/hideUnexecutedSubviews.proftext -o %t.profdata
-RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata -Xdemangler sed -Xdemangler 's/_/X/g' -filename-equivalence %S/showTemplateInstantiations.cpp | FileCheck %s
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata -Xdemangler sed -Xdemangler 's/_/X/g' -path-equivalence=/tmp,%S %S/showTemplateInstantiations.cpp | FileCheck %s
 
 // Check that we demangle names when printing out function summaries.
-RUN: llvm-cov report -show-functions %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -Xdemangler sed -Xdemangler 's/_/X/g' -filename-equivalence %S/showTemplateInstantiations.cpp | FileCheck %s
+RUN: llvm-cov report -show-functions %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -Xdemangler sed -Xdemangler 's/_/X/g' -path-equivalence=/tmp,%S %S/showTemplateInstantiations.cpp | FileCheck %s
 
 CHECK-DAG: XZ4funcIbEiTX
 CHECK-DAG: XZ4funcIiEiTX

test/tools/llvm-cov/hideUnexecutedSubviews.test

 RUN: llvm-profdata merge %S/Inputs/hideUnexecutedSubviews.proftext -o %t.profdata
 
-RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata -filename-equivalence %S/showTemplateInstantiations.cpp | FileCheck -check-prefix=FILE %s
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata -path-equivalence=/tmp,%S %S/showTemplateInstantiations.cpp | FileCheck -check-prefix=FILE %s
 
-RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata -format html -o %t.html.dir -filename-equivalence %S/showTemplateInstantiations.cpp
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata -format html -o %t.html.dir -path-equivalence=/tmp,%S %S/showTemplateInstantiations.cpp
 RUN: FileCheck -check-prefix=FILE %s -input-file %t.html.dir/coverage/tmp/showTemplateInstantiations.cpp.html
 
 FILE: Unexecuted instantiation: _Z4funcIbEiT_
 FILE: Unexecuted instantiation: _Z4funcIiEiT_
 FILE-NOT: Unexecuted instantiation
 
 RUN: FileCheck -check-prefix=INDEX %s -input-file %t.html.dir/index.html
 

test/tools/llvm-cov/native_separators.c

 // To create the covmapping for this file on Linux, copy this file to /tmp
 // cd into /tmp. Use llvm-cov convert-for-testing to extract the covmapping.
 // This test is Windows-only. It checks that all paths, which are generated
 // in the index and source coverage reports, are native path. For example,
 // on Windows all '/' are converted to '\'.
 // REQUIRES: system-windows
 
 // 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 -filename-equivalence ../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 -filename-equivalence %s -o %t.dir
+// 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
 
 // TEXT-INDEX: \tmp\native_separators.c
 // HTML-INDEX: >tmp\native_separators.c</a>
 // HTML: <pre>\tmp\native_separators.c</pre>
 
 int main() {}

test/tools/llvm-cov/path_equivalence.c

+// RUN: llvm-profdata merge %S/Inputs/path_equivalence.proftext -o %t.profdata
+// RUN: llvm-cov show %S/Inputs/path_equivalence.covmapping -instr-profile=%t.profdata -path-equivalence=/tmp,%S | FileCheck %s
+
+int main() {} // CHECK: [[@LINE]]|      1|int main() {}

test/tools/llvm-cov/prefer_used_to_unused.h

 // Check that llvm-cov loads real coverage mapping data for a function
 // even though dummy coverage data for that function comes first.
 // Dummy coverage data is exported if the definition of an inline function
 // is seen but the function is not used in the translation unit.
 
 // If you need to rebuild the 'covmapping' file for this test, please use
 // the following commands:
 // clang++ -fprofile-instr-generate -fcoverage-mapping -o tmp -x c++ prefer_used_to_unused.h prefer_used_to_unused.cpp
 // llvm-cov convert-for-testing -o prefer_used_to_unused.covmapping tmp
 
 // RUN: llvm-profdata merge %S/Inputs/prefer_used_to_unused.proftext -o %t.profdata
-// RUN: llvm-cov show %S/Inputs/prefer_used_to_unused.covmapping -instr-profile %t.profdata -filename-equivalence %s | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/prefer_used_to_unused.covmapping -instr-profile %t.profdata -path-equivalence=/tmp/uu/./,%S %s | FileCheck %s
 
 // Coverage data for this function has a non-zero hash value if it is used in the translation unit.
 inline int sampleFunc(int A) { // CHECK:      [[@LINE]]| 1|inline int sampleFunc(int A) {
   if (A > 0)                   // CHECK-NEXT: [[@LINE]]| 1|  if (A > 0)
     return A;                  // CHECK-NEXT: [[@LINE]]| 1|    return A;
   return 0;                    // CHECK-NEXT: [[@LINE]]| 0|  return 0;
 }                              // CHECK-NEXT: [[@LINE]]| 1|}
 
 // The hash for this function is zero in both cases, either it is used in the translation unit or not.
 inline int simpleFunc(int A) { // CHECK:      [[@LINE]]| 1|inline int simpleFunc(int A) {
   return A;                    // CHECK-NEXT: [[@LINE]]| 1|  return A;
 }                              // CHECK-NEXT: [[@LINE]]| 1|}

test/tools/llvm-cov/prevent_false_instantiations.h

 // Checks that function instantiations don't go to a wrong file.
 
 // INSTANTIATION-NOT: {{_Z5func[1,2]v}}
 // NAN-NOT: {{[ \t]+}}nan%
 
 // RUN: llvm-profdata merge %S/Inputs/prevent_false_instantiations.proftext -o %t.profdata
-// RUN: llvm-cov show -format text %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %t.profdata -filename-equivalence %s | FileCheck %s -check-prefix=INSTANTIATION
+// RUN: llvm-cov show -format text %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %t.profdata -path-equivalence=/tmp/false_instantiations/./,%S %s | FileCheck %s -check-prefix=INSTANTIATION
 // RUN: llvm-cov report %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %t.profdata | FileCheck %s -check-prefix=NAN
 
 #define DO_SOMETHING() \
   do {                 \
   } while (0)

test/tools/llvm-cov/report.cpp

-// RUN: llvm-cov report %S/Inputs/report.covmapping -instr-profile %S/Inputs/report.profdata -filename-equivalence 2>&1 | FileCheck %s
-// RUN: llvm-cov report -show-functions %S/Inputs/report.covmapping -instr-profile %S/Inputs/report.profdata -filename-equivalence report.cpp 2>&1 | FileCheck -check-prefix=FILT %s
-// RUN: llvm-cov report -show-functions %S/Inputs/report.covmapping -instr-profile %S/Inputs/report.profdata -filename-equivalence report.cpp does-not-exist.cpp 2>&1 | FileCheck -check-prefix=FILT %s
+// RUN: llvm-cov report %S/Inputs/report.covmapping -instr-profile %S/Inputs/report.profdata -path-equivalence=/tmp,%S 2>&1 | FileCheck %s
+// RUN: llvm-cov report -show-functions %S/Inputs/report.covmapping -instr-profile %S/Inputs/report.profdata -path-equivalence=/tmp,%S %s 2>&1 | FileCheck -check-prefix=FILT %s
+// RUN: llvm-cov report -show-functions %S/Inputs/report.covmapping -instr-profile %S/Inputs/report.profdata -path-equivalence=/tmp,%S %s does-not-exist.cpp 2>&1 | FileCheck -check-prefix=FILT %s
 
 // CHECK: Regions    Missed Regions     Cover   Functions  Missed Functions  Executed  Instantiations   Missed Insts.  Executed       Lines      Missed Lines     Cover
 // CHECK-NEXT: ---
 // CHECK-NEXT: report.cpp                          5                 2    60.00%           4                 1    75.00%               4               1    75.00%          13                 4    69.23%
 // CHECK-NEXT: ---
 // CHECK-NEXT: TOTAL                               5                 2    60.00%           4                 1    75.00%               4               1    75.00%          13                 4    69.23%
 
 // FILT: File 'report.cpp':

 
 int main() {
   foo(false);
   bar();
   return 0;
 }
 
 // Test that listing multiple functions in a function view works.
-// RUN: llvm-cov show -o %t.dir %S/Inputs/report.covmapping -instr-profile=%S/Inputs/report.profdata -filename-equivalence -name-regex=".*" %s
+// RUN: llvm-cov show -o %t.dir %S/Inputs/report.covmapping -instr-profile=%S/Inputs/report.profdata -path-equivalence=/tmp,%S -name-regex=".*" %s
 // RUN: FileCheck -check-prefix=FUNCTIONS -input-file %t.dir/functions.txt %s
 // FUNCTIONS: _Z3foob
 // FUNCTIONS: _Z3barv
 // FUNCTIONS: _Z4func

test/tools/llvm-cov/scan-directory.test

 RUN: mkdir -p %t/a/b/
 RUN: echo "" > %t/a/b/c.tmp
 RUN: echo "" > %t/a/d.tmp
 
 RUN: llvm-cov show /dev/null -instr-profile /dev/null -dump-collected-paths %t | FileCheck %s --check-prefix=REAL
 RUN: llvm-cov show /dev/null -instr-profile /dev/null -dump-collected-paths %t/a/b/c.tmp %t/a/d.tmp | FileCheck %s --check-prefix=REAL
 
 REAL-DAG: {{.*}}c.tmp
 REAL-DAG: {{.*}}d.tmp
 
-RUN: llvm-cov show /dev/null -instr-profile /dev/null -dump-collected-paths -filename-equivalence %t a b c d e f | FileCheck %s --check-prefix=EQUIV
+// NEEDS FIX.
+RUN: llvm-cov show /dev/null -instr-profile /dev/null -dump-collected-paths -path-equivalence=/tmp,%S %t a b c d e f | FileCheck %s --check-prefix=EQUIV
 EQUIV-DAG: {{.*}}c.tmp
 EQUIV-DAG: {{.*}}d.tmp
 EQUIV-DAG: a
 EQUIV-DAG: b
 EQUIV-DAG: c
 EQUIV-DAG: d
 EQUIV-DAG: e
 EQUIV-DAG: f

test/tools/llvm-cov/showExpansions.cpp

-// RUN: llvm-cov show %S/Inputs/showExpansions.covmapping -instr-profile %S/Inputs/showExpansions.profdata -dump -show-expansions -filename-equivalence %s 2>&1 | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/showExpansions.covmapping -instr-profile %S/Inputs/showExpansions.profdata -dump -show-expansions -path-equivalence=/tmp,%S %s 2>&1 | FileCheck %s
 
 #define DO_SOMETHING_ELSE() \
   do {                      \
   } while (0)
 #define ANOTHER_THING() \
   do {                  \
     if (0) {            \
     }                   \

test/tools/llvm-cov/showHighlightedRanges.cpp

-// RUN: llvm-cov show %S/Inputs/highlightedRanges.covmapping -instr-profile %S/Inputs/highlightedRanges.profdata -dump -filename-equivalence %s 2>&1 | FileCheck %s -check-prefixes=TEXT,SHARED
+// RUN: llvm-cov show %S/Inputs/highlightedRanges.covmapping -instr-profile %S/Inputs/highlightedRanges.profdata -dump -path-equivalence=/tmp,%S %s 2>&1 | FileCheck %s -check-prefixes=TEXT,SHARED
 
 void func() {
   return;
   int i = 0;                     // SHARED: Highlighted line [[@LINE]], 3 ->
 }                                // SHARED: Highlighted line [[@LINE]], 1 -> 2
 
 void func2(int x) {
   if(x > 5) {

 
 int main() {
   test();
   func();
   func2(9);
   return 0;
 }
 
-// RUN: llvm-cov show %S/Inputs/highlightedRanges.covmapping -instr-profile %S/Inputs/highlightedRanges.profdata -format html -dump -filename-equivalence %s 2>&1 | FileCheck %s -check-prefixes=HTML,SHARED
+// RUN: llvm-cov show %S/Inputs/highlightedRanges.covmapping -instr-profile %S/Inputs/highlightedRanges.profdata -format html -dump -path-equivalence=/tmp,%S %s 2>&1 | FileCheck %s -check-prefixes=HTML,SHARED
 // RUN: llvm-cov export %S/Inputs/highlightedRanges.covmapping -instr-profile %S/Inputs/highlightedRanges.profdata 2>&1 | FileCheck %S/Inputs/highlightedRanges.json

test/tools/llvm-cov/showLineExecutionCounts.cpp

x = x > 10 ?                            // TEXT: [[@LINE]]|   161|  x =
         x - 1:                            // TEXT: [[@LINE]]|     0|        x
         x + 1;                            // TEXT: [[@LINE]]|   161|        x
                                           // TEXT: [[@LINE]]|   161|
   return 0;                               // TEXT: [[@LINE]]|   161|  return
 }                                         // TEXT: [[@LINE]]|   161|}
 // after coverage                   // WHOLE-FILE: [[@LINE]]|      |// after
                                     // FILTER-NOT: [[@LINE-1]]|    |// after
 
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -instr-profile %t.profdata -filename-equivalence %s | FileCheck -check-prefixes=TEXT,WHOLE-FILE %s
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -instr-profile %t.profdata -filename-equivalence -name=main %s | FileCheck -check-prefixes=TEXT,FILTER %s
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -instr-profile %t.profdata -path-equivalence=/tmp,%S %s | FileCheck -check-prefixes=TEXT,WHOLE-FILE %s
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -instr-profile %t.profdata -path-equivalence=/tmp,%S -name=main %s | FileCheck -check-prefixes=TEXT,FILTER %s
 
 // Test -output-dir.
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -o %t.dir -instr-profile %t.profdata -filename-equivalence %s
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -output-dir %t.dir -instr-profile %t.profdata -filename-equivalence -name=main %s
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -o %t.dir -instr-profile %t.profdata -path-equivalence=/tmp,%S %s
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -output-dir %t.dir -instr-profile %t.profdata -path-equivalence=/tmp,%S -name=main %s
 // RUN: FileCheck -check-prefixes=TEXT,WHOLE-FILE -input-file %t.dir/coverage/tmp/showLineExecutionCounts.cpp.txt %s
 // RUN: FileCheck -check-prefixes=TEXT,FILTER -input-file %t.dir/functions.txt %s
 //
 // RUN: llvm-cov export %S/Inputs/lineExecutionCounts.covmapping -instr-profile %t.profdata -name=main 2>/dev/null > %t.export.json
 // RUN: FileCheck -input-file %t.export.json %S/Inputs/lineExecutionCounts.json
 // RUN: cat %t.export.json | %python -c "import json, sys; json.loads(sys.stdin.read())"
 //
 // Test html output.
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -format html -o %t.html.dir -instr-profile %t.profdata -filename-equivalence %s
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -format html -o %t.html.dir -instr-profile %t.profdata -filename-equivalence -name=main %s
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -format html -o %t.html.dir -instr-profile %t.profdata -path-equivalence=/tmp,%S %s
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -format html -o %t.html.dir -instr-profile %t.profdata -path-equivalence=/tmp,%S -name=main %s
 // RUN: FileCheck -check-prefixes=HTML,HTML-WHOLE-FILE -input-file %t.html.dir/coverage/tmp/showLineExecutionCounts.cpp.html %s
 // RUN: FileCheck -check-prefixes=HTML,HTML-FILTER -input-file %t.html.dir/functions.html %s
 //
 // HTML-WHOLE-FILE: <td class='line-number'><a name='L[[@LINE-44]]' href='#L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='uncovered-line'></td><td class='code'><pre>// before
 // HTML-FILTER-NOT: <td class='line-number'><a name='L[[@LINE-45]]' href='#L[[@LINE-45]]'><pre>[[@LINE-45]]</pre></a></td><td class='uncovered-line'></td><td class='code'><pre>// before
 // HTML: <td class='line-number'><a name='L[[@LINE-44]]' href='#L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='covered-line'><pre>161</pre></td><td class='code'><pre>int main() {
 // HTML: <td class='line-number'><a name='L[[@LINE-44]]' href='#L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='covered-line'><pre>161</pre></td><td class='code'><pre>  int x = 0
 // HTML: <td class='line-number'><a name='L[[@LINE-44]]' href='#L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='covered-line'><pre>161</pre></td><td class='code'><pre>

test/tools/llvm-cov/showProjectSummary.cpp

 // RUN: llvm-profdata merge -o %t.profdata %S/Inputs/showProjectSummary.proftext
 
 int main(int argc, char ** argv) {
   int x=0;
   for (int i = 0; i < 20; ++i)
     x *= 2;
   if (x >= 100)
     x = x / 2;
   else
     x = x * 2;
   return x;
 }
 
 // Test console output.
-// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -instr-profile %t.profdata -filename-equivalence %s | FileCheck -check-prefixes=TEXT,TEXT-FILE,TEXT-HEADER %S/Inputs/showProjectSummary.test
-// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -instr-profile %t.profdata -project-title "Test Suite" -filename-equivalence %s | FileCheck -check-prefixes=TEXT-TITLE,TEXT,TEXT-FILE,TEXT-HEADER %S/Inputs/showProjectSummary.test
-// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -instr-profile %t.profdata -project-title "Test Suite" -name=main -filename-equivalence %s | FileCheck -check-prefixes=TEXT-FUNCTION,TEXT-HEADER %S/Inputs/showProjectSummary.test
-// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -instr-profile=%t.profdata -o %t.dir -filename-equivalence %s
+// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -instr-profile %t.profdata -path-equivalence=/tmp,%S %s | FileCheck -check-prefixes=TEXT,TEXT-FILE,TEXT-HEADER %S/Inputs/showProjectSummary.test
+// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -instr-profile %t.profdata -project-title "Test Suite" -path-equivalence=/tmp,%S %s | FileCheck -check-prefixes=TEXT-TITLE,TEXT,TEXT-FILE,TEXT-HEADER %S/Inputs/showProjectSummary.test
+// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -instr-profile %t.profdata -project-title "Test Suite" -name=main -path-equivalence=/tmp,%S %s | FileCheck -check-prefixes=TEXT-FUNCTION,TEXT-HEADER %S/Inputs/showProjectSummary.test
+// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -instr-profile=%t.profdata -o %t.dir -path-equivalence=/tmp,%S %s
 // RUN: FileCheck -check-prefixes=TEXT-FOOTER -input-file=%t.dir/index.txt %S/Inputs/showProjectSummary.test
 
 // Test html output.
-// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -format=html -o %t.dir -instr-profile %t.profdata -filename-equivalence %s
+// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -format=html -o %t.dir -instr-profile %t.profdata -path-equivalence=/tmp,%S %s
 // RUN: FileCheck -check-prefixes=HTML,HTML-FILE,HTML-HEADER -input-file %t.dir/coverage/tmp/showProjectSummary.cpp.html %S/Inputs/showProjectSummary.test
-// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -format=html -o %t.dir -instr-profile %t.profdata -project-title "Test Suite" -filename-equivalence %s
+// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -format=html -o %t.dir -instr-profile %t.profdata -project-title "Test Suite" -path-equivalence=/tmp,%S %s
 // RUN: FileCheck -check-prefixes=HTML-TITLE,HTML,HTML-FILE,HTML-HEADER -input-file %t.dir/coverage/tmp/showProjectSummary.cpp.html %S/Inputs/showProjectSummary.test
 // RUN: FileCheck -check-prefixes=HTML-TITLE,HTML,HTML-FOOTER -input-file %t.dir/index.html %S/Inputs/showProjectSummary.test
-// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -format=html -o %t.dir -instr-profile %t.profdata  -project-title "Test Suite" -filename-equivalence -name=main %s
+// RUN: llvm-cov show %S/Inputs/showProjectSummary.covmapping -format=html -o %t.dir -instr-profile %t.profdata  -project-title "Test Suite" -path-equivalence=/tmp,%S -name=main %s
 // RUN: FileCheck -check-prefixes=HTML-FUNCTION,HTML-HEADER -input-file %t.dir/functions.html %S/Inputs/showProjectSummary.test

test/tools/llvm-cov/showRegionMarkers.cpp

int main() {                      // CHECK: Marker at [[@LINE]]:12 = 1.11M
   x = x < 10 ? x + 1 : x - 1;     // CHECK: Marker at [[@LINE]]:24 = 0
   x = x > 10 ?
         x - 1:                    // CHECK: Marker at [[@LINE]]:9 = 0
         x + 1;                    // CHECK: Marker at [[@LINE]]:9 = 1.11M
 
   return 0;
 }
 
-// RUN: llvm-cov show %S/Inputs/regionMarkers.covmapping -instr-profile %t.profdata -show-regions -dump -filename-equivalence %s 2>&1 | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/regionMarkers.covmapping -instr-profile %t.profdata -show-regions -dump -path-equivalence=/tmp,%S %s 2>&1 | FileCheck %s
 
 // RUN: llvm-cov export %S/Inputs/regionMarkers.covmapping -instr-profile %t.profdata 2>&1 | FileCheck %S/Inputs/regionMarkers.json

test/tools/llvm-cov/showTabsHTML.cpp

 // RUN: llvm-profdata merge -o %t.profdata %S/Inputs/showTabsHTML.proftext
-// RUN: llvm-cov show %S/Inputs/showTabsHTML.covmapping -format html -instr-profile %t.profdata -filename-equivalence %s | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/showTabsHTML.covmapping -format html -instr-profile %t.profdata -path-equivalence=/tmp,%S %s | FileCheck %s
 
 int main(int argc, char ** argv) {
   (void) "This tab starts at column 0";            // CHECK:   (void) "This tab starts at column 0";
   (void) "  This tab starts at column 10";           // CHECK: (void) "  This tab starts at column 10";
   (void) "This    tab starts at column 15";           // CHECK: (void) "This   tab starts at column 15";
 
   return 0;
 }
 
-// RUN: llvm-cov show %S/Inputs/showTabsHTML.covmapping -format html -tab-size=3 -instr-profile %t.profdata -filename-equivalence %s | FileCheck -check-prefix=CHECK-TABSIZE %s
+// RUN: llvm-cov show %S/Inputs/showTabsHTML.covmapping -format html -tab-size=3 -instr-profile %t.profdata -path-equivalence=/tmp,%S %s | FileCheck -check-prefix=CHECK-TABSIZE %s
 
 // CHECK-TABSIZE:    (void) "This tab starts at column 0";
 // CHECK-TABSIZE: (void) "  This tab starts at column 10";
 // CHECK-TABSIZE: (void) "This     tab starts at column 15";

test/tools/llvm-cov/showTemplateInstantiations.cpp

-// RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -filename-equivalence %s | FileCheck -check-prefixes=SHARED,ALL %s
-// RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -filename-equivalence -name=_Z4funcIbEiT_ %s | FileCheck -check-prefixes=SHARED,FILTER %s
+// RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -path-equivalence=/tmp,%S %s | FileCheck -check-prefixes=SHARED,ALL %s
+// RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -path-equivalence=/tmp,%S -name=_Z4funcIbEiT_ %s | FileCheck -check-prefixes=SHARED,FILTER %s
 
 // before coverage   // ALL:         [[@LINE]]|  |// before
                      // FILTER-NOT:[[@LINE-1]]|  |// before
 template<typename T> // ALL:         [[@LINE]]|  |template<typename T>
 int func(T x) {      // ALL-NEXT:    [[@LINE]]| 2|int func(T x) {
   if(x)              // ALL-NEXT:    [[@LINE]]| 2|  if(x)
     return 0;        // ALL-NEXT:    [[@LINE]]| 1|    return 0;
   else               // ALL-NEXT:    [[@LINE]]| 2|  else
int main() {         // ALL:         [[@LINE]]| 1|int main() {
   func<int>(0);      // ALL-NEXT:    [[@LINE]]| 1|  func<int>(0);
   func<bool>(true);  // ALL-NEXT:    [[@LINE]]| 1|  func<bool>(true);
   return 0;          // ALL-NEXT:    [[@LINE]]| 1|  return 0;
 }                    // ALL-NEXT:    [[@LINE]]| 1|}
 // after coverage    // ALL-NEXT:    [[@LINE]]|  |// after
                      // FILTER-NOT:[[@LINE-1]]|  |// after
 
 // Test html output.
-// RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -filename-equivalence %s -format html -o %t.html.dir
-// RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -filename-equivalence -name=_Z4funcIbEiT_ %s -format html -o %t.html.dir
+// RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -path-equivalence=/tmp,%S %s -format html -o %t.html.dir
+// RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -path-equivalence=/tmp,%S -name=_Z4funcIbEiT_ %s -format html -o %t.html.dir
 // RUN: FileCheck -check-prefixes=HTML-SHARED,HTML-ALL -input-file=%t.html.dir/coverage/tmp/showTemplateInstantiations.cpp.html %s
 // RUN: FileCheck -check-prefixes=HTML-SHARED,HTML-FILTER -input-file=%t.html.dir/functions.html %s
 
 // HTML-ALL: <td class='line-number'><a name='L[[@LINE-44]]' href='#L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='uncovered-line'></td><td class='code'><pre>// before
 // HTML-FILTER-NOT: <td class='line-number'><a name='L[[@LINE-45]]' href='#L[[@LINE-45]]'><pre>[[@LINE-45]]</pre></a></td><td class='uncovered-line'></td><td class='code'><pre>// before
 // HTML-ALL: <td class='line-number'><a name='L[[@LINE-44]]' href='#L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='uncovered-line'></td><td class='code'><pre>template&lt;typename T&gt;
 // HTML-ALL: <td class='line-number'><a name='L[[@LINE-44]]' href='#L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='covered-line'><pre>2</pre></td><td class='code'><pre>int func(T x) {
 // HTML-ALL: <td class='line-number'><a name='L[[@LINE-44]]' href='#L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='covered-line'><pre>2</pre></td><td class='code'><pre>  if(x)

test/tools/llvm-cov/style.test

-RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -filename-equivalence %S/showTemplateInstantiations.cpp -format html -o %t.dir
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -path-equivalence=/tmp,%S %S/showTemplateInstantiations.cpp -format html -o %t.dir
 
-RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -filename-equivalence -name=_Z4funcIbEiT_ %S/showTemplateInstantiations.cpp -format html -o %t.dir
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -path-equivalence=/tmp,%S -name=_Z4funcIbEiT_ %S/showTemplateInstantiations.cpp -format html -o %t.dir
 
-RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -filename-equivalence %S/showTemplateInstantiations.cpp -format html | FileCheck %s -check-prefix=NODIR
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %S/Inputs/templateInstantiations.profdata -path-equivalence=/tmp,%S %S/showTemplateInstantiations.cpp -format html | FileCheck %s -check-prefix=NODIR
 
 RUN: FileCheck %s -input-file=%t.dir/style.css -check-prefix=STYLE
 RUN: FileCheck %s -input-file=%t.dir/functions.html -check-prefix=TOPLEVEL
 RUN: FileCheck %s -input-file=%t.dir/index.html -check-prefix=TOPLEVEL
 RUN: FileCheck %s -input-file=%t.dir/coverage/tmp/showTemplateInstantiations.cpp.html -check-prefix=FILEVIEW
 
 STYLE-DAG: .red
 STYLE-DAG: .cyan

test/tools/llvm-cov/threads.c

 // Coverage/profile data recycled from the showLineExecutionCounts.cpp test.
 //
 // RUN: llvm-profdata merge %S/Inputs/lineExecutionCounts.proftext -o %t.profdata
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -j 1 -o %t1.dir -instr-profile %t.profdata -filename-equivalence %S/showLineExecutionCounts.cpp
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -num-threads 2 -o %t2.dir -instr-profile %t.profdata -filename-equivalence %S/showLineExecutionCounts.cpp
-// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -o %t3.dir -instr-profile %t.profdata -filename-equivalence %S/showLineExecutionCounts.cpp
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -j 1 -o %t1.dir -instr-profile %t.profdata -path-equivalence=/tmp,%S %S/showLineExecutionCounts.cpp
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -num-threads 2 -o %t2.dir -instr-profile %t.profdata -path-equivalence=/tmp,%S %S/showLineExecutionCounts.cpp
+// RUN: llvm-cov show %S/Inputs/lineExecutionCounts.covmapping -o %t3.dir -instr-profile %t.profdata -path-equivalence=/tmp,%S %S/showLineExecutionCounts.cpp
 //
 // RUN: diff %t1.dir/index.txt %t2.dir/index.txt
 // RUN: diff %t1.dir/coverage/tmp/showLineExecutionCounts.cpp.txt %t2.dir/coverage/tmp/showLineExecutionCounts.cpp.txt
 // RUN: diff %t1.dir/index.txt %t3.dir/index.txt
 // RUN: diff %t1.dir/coverage/tmp/showLineExecutionCounts.cpp.txt %t3.dir/coverage/tmp/showLineExecutionCounts.cpp.txt

test/tools/llvm-cov/universal-binary.c

 // The coverage reader should be able to handle universal binaries
 
 // CHECK: [[@LINE+1]]| 100|int main
 int main(int argc, const char *argv[]) {}
 
 // RUN: llvm-profdata merge %S/Inputs/universal-binary.proftext -o %t.profdata
-// RUN: llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -filename-equivalence %s -arch x86_64 | FileCheck %s
+// RUN: llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -path-equivalence=/tmp,%S %s -arch x86_64 | FileCheck %s
 // RUN: llvm-cov export %S/Inputs/universal-binary -instr-profile %t.profdata -arch x86_64 2>&1 | FileCheck %S/Inputs/universal-binary.json
 
 // RUN: llvm-cov report %S/Inputs/universal-binary -arch x86_64 -object %S/Inputs/templateInstantiations.covmapping -arch i386 -instr-profile %t.profdata 2>&1 | FileCheck %s --check-prefix=COMBINED
 // COMBINED: showTemplateInstantiations.cpp
 // COMBINED-NEXT: universal-binary.c
 
-// RUN: not llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -filename-equivalence %s -arch i386 2>&1 | FileCheck --check-prefix=WRONG-ARCH %s
+// RUN: not llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -path-equivalence=/tmp,%S %s -arch i386 2>&1 | FileCheck --check-prefix=WRONG-ARCH %s
 // WRONG-ARCH: Failed to load coverage
 
 // RUN: not llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -filename-equivalence %s -arch definitly_a_made_up_architecture 2>&1 | FileCheck --check-prefix=MADE-UP-ARCH %s
 // MADE-UP-ARCH: Unknown architecture: definitly_a_made_up_architecture
 
 // RUN: not llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -filename-equivalence %s -arch=x86_64 -arch=x86_64 2>&1 | FileCheck --check-prefix=TOO-MANY-ARCH %s
 // TOO-MANY-ARCH: Number of architectures doesn't match the number of objects
 //
 // RUN: not llvm-cov report -instr-profile %t.profdata 2>&1 | FileCheck --check-prefix=MISSING-BINARY %s
 // MISSING-BINARY: No filenames specified!

test/tools/llvm-cov/warnings.h

-// RUN: llvm-cov show %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %S/Inputs/elf_binary_comdat.profdata -filename-equivalence /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 -filename-equivalence /dev/null 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 | 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 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 -filename-equivalence -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 -filename-equivalence -name-regex ".*" /dev/null 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 ".*" /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 ".*" /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

private:
   CoverageViewOptions ViewOpts;
   CoverageFiltersMatchAll Filters;
 
   /// The path to the indexed profile.
   std::string PGOFilename;
 
   /// A list of input source files.
   std::vector<std::string> SourceFiles;
 
-  /// Whether or not we're in -filename-equivalence mode.
-  bool CompareFilenamesOnly;
-
-  /// In -filename-equivalence mode, this maps absolute paths from the
+  /// In -path-equivalence mode, this maps absolute paths from the
   /// coverage mapping data to input source files.
   StringMap<std::string> RemappedFilenames;
 
+  /// The coverage data path to be remapped from, and the source path to be
+  /// remapped to, when using -path-equivalence.
+  Optional<std::pair<std::string, std::string>> PathRemapping;
+
   /// The architecture the coverage mapping data targets.
   std::vector<StringRef> CoverageArches;
 
   /// A cache for demangled symbols.
   DemangleCache DC;
 
   /// A lock which guards printing to stderr.
   std::mutex ErrsLock;

 }
 
 void CodeCoverageTool::warning(const Twine &Message, StringRef Whence) {
   std::unique_lock<std::mutex> Guard{ErrsLock};
   ViewOpts.colored_ostream(errs(), raw_ostream::RED)
       << getErrorString(Message, Whence, true);
 }
 
 void CodeCoverageTool::addCollectedPath(const std::string &Path) {
-  if (CompareFilenamesOnly) {
-    SourceFiles.emplace_back(Path);
-  } else {
-    SmallString<128> EffectivePath(Path);
-    if (std::error_code EC = sys::fs::make_absolute(EffectivePath)) {
-      error(EC.message(), Path);
-      return;
-    }
-    sys::path::remove_dots(EffectivePath, /*remove_dot_dots=*/true);
-    SourceFiles.emplace_back(EffectivePath.str());
-  }
-}
 
 void CodeCoverageTool::collectPaths(const std::string &Path) {
   llvm::sys::fs::file_status Status;
   llvm::sys::fs::status(Path, Status);
   if (!llvm::sys::fs::exists(Status)) {
-    if (CompareFilenamesOnly)
-      addCollectedPath(Path);
-    else
-      error("Missing source file", Path);
     return;
   }
 
   if (llvm::sys::fs::is_regular_file(Status)) {
     addCollectedPath(Path);
     return;
   }
 
std::unique_ptr<CoverageMapping> CodeCoverageTool::load() {
 
   demangleSymbols(*Coverage);
 
   return Coverage;
 }
 
 void CodeCoverageTool::removeUnmappedInputs(const CoverageMapping &Coverage) {
   std::vector<StringRef> CoveredFiles = Coverage.getUniqueSourceFiles();
 
   auto UncoveredFilesIt = SourceFiles.end();
-  if (!CompareFilenamesOnly) {
-    // The user may have specified source files which aren't in the coverage
-    // mapping. Filter these files away.
-    UncoveredFilesIt = std::remove_if(
-        SourceFiles.begin(), SourceFiles.end(), [&](const std::string &SF) {
-          return !std::binary_search(CoveredFiles.begin(), CoveredFiles.end(),
-                                     SF);
-        });
-  } else {
-    for (auto &SF : SourceFiles) {
-      StringRef SFBase = sys::path::filename(SF);
-      for (const auto &CF : CoveredFiles) {
-        if (SFBase == sys::path::filename(CF)) {
-          RemappedFilenames[CF] = SF;
-          SF = CF;
-          break;
-        }
-      }
-    }
-    UncoveredFilesIt = std::remove_if(
-        SourceFiles.begin(), SourceFiles.end(),
-        [&](const std::string &SF) { return !RemappedFilenames.count(SF); });
-  }
 
   SourceFiles.erase(UncoveredFilesIt, SourceFiles.end());
 }
 
 void CodeCoverageTool::demangleSymbols(const CoverageMapping &Coverage) {
   if (!ViewOpts.hasDemangler())
     return;
 
   // Pass function names to the demangler in a temporary file.
   int InputFD;
   SmallString<256> InputPath;
   std::error_code EC =
       sys::fs::createTemporaryFile("demangle-in", "list", InputFD, InputPath);
   if (EC) {
     error(InputPath, EC.message());
     return;
   }
   tool_output_file InputTOF{InputPath, InputFD};
 
int CodeCoverageTool::run(Command Cmd, int argc, const char **argv) {
 
   cl::opt<CoverageViewOptions::OutputFormat> Format(
       "format", cl::desc("Output format for line-based coverage reports"),
       cl::values(clEnumValN(CoverageViewOptions::OutputFormat::Text, "text",
                             "Text output"),
                  clEnumValN(CoverageViewOptions::OutputFormat::HTML, "html",
                             "HTML output")),
       cl::init(CoverageViewOptions::OutputFormat::Text));
 
-  cl::opt<bool> FilenameEquivalence(
-      "filename-equivalence", cl::Optional,
-      cl::desc("Treat source files as equivalent to paths in the coverage data "
-               "when the file names match, even if the full paths do not"));
+  cl::opt<std::string> PathRemap(
+      "path-equivalence", cl::Optional,
+      cl::desc("<from>,<to> Map coverage data paths to local source file "
+               "paths"));
 
   cl::OptionCategory FilteringCategory("Function filtering options");
 
   cl::list<std::string> NameFilters(
       "name", cl::Optional,
       cl::desc("Show code coverage only for functions with the given name"),
       cl::ZeroOrMore, cl::cat(FilteringCategory));
 
cl::opt<cl::boolOrDefault> UseColor(
       cl::init(cl::BOU_UNSET));
 
   cl::list<std::string> DemanglerOpts(
       "Xdemangler", cl::desc("<demangler-path>|<demangler-option>"));
 
   auto commandLineParser = [&, this](int argc, const char **argv) -> int {
     cl::ParseCommandLineOptions(argc, argv, "LLVM code coverage tool\n");
     ViewOpts.Debug = DebugDump;
-    CompareFilenamesOnly = FilenameEquivalence;
 
     if (!CovFilename.empty())
       ObjectFilenames.emplace_back(CovFilename);
     for (const std::string &Filename : CovFilenames)
       ObjectFilenames.emplace_back(Filename);
     if (ObjectFilenames.empty()) {
       errs() << "No filenames specified!\n";
       ::exit(1);
     }
 
     ViewOpts.Format = Format;
     switch (ViewOpts.Format) {
     case CoverageViewOptions::OutputFormat::Text:
       ViewOpts.Colors = UseColor == cl::BOU_UNSET
                             ? sys::Process::StandardOutHasColors()
                             : UseColor == cl::BOU_TRUE;
       break;
     case CoverageViewOptions::OutputFormat::HTML:
       if (UseColor == cl::BOU_FALSE)
         errs() << "Color output cannot be disabled when generating html.\n";
       ViewOpts.Colors = true;
       break;
     }
 
+    // If path-equivalence was given and is a comma seperated pair then set
+    // PathRemapping.
+    auto EquivPair = StringRef(PathRemap).split(',');
+    if (!(EquivPair.first.empty() || EquivPair.second.empty()))
+      PathRemapping = EquivPair;
+
     // If a demangler is supplied, check if it exists and register it.
     if (DemanglerOpts.size()) {
       auto DemanglerPathOrErr = sys::findProgramByName(DemanglerOpts[0]);
       if (!DemanglerPathOrErr) {
         error("Could not find the demangler!",
               DemanglerPathOrErr.getError().message());
         return 1;
       }
       DemanglerOpts[0] = *DemanglerPathOrErr;
       ViewOpts.DemanglerOpts.swap(DemanglerOpts);
     }
 
     // Create the function filters
     if (!NameFilters.empty() || !NameRegexFilters.empty()) {
       auto NameFilterer = llvm::make_unique<CoverageFilters>();
       for (const auto &Name : NameFilters)
         NameFilterer->push_back(llvm::make_unique<NameCoverageFilter>(Name));
bool ShowFilenames =
       (SourceFiles.size() != 1) || ViewOpts.hasOutputDirectory() ||
       (ViewOpts.Format == CoverageViewOptions::OutputFormat::HTML);
 
   if (SourceFiles.empty())
     // Get the source files from the function coverage mapping.
     for (StringRef Filename : Coverage->getUniqueSourceFiles())
       SourceFiles.push_back(Filename);
 
+  // Remap by leading path (path-equivalence).
+  if (PathRemapping.hasValue()) {
+    // Convert to remapping paths to native paths with trailing seperators.
+    auto nativeWithTrailing = [](StringRef path) -> std::string {
+      SmallString<128> NativePath;
+      sys::path::native(path, NativePath);
+      if (!sys::path::is_separator(NativePath.back()))
+        NativePath += sys::path::get_separator();
+      return NativePath.c_str();
+    };
+    std::string RemapFrom = nativeWithTrailing(PathRemapping->first);
+    std::string RemapTo = nativeWithTrailing(PathRemapping->second);
+
+    for (StringRef Filename : SourceFiles) {
+      SmallString<128> NativeFilename;
+      sys::path::native(Filename, NativeFilename);
+      if (NativeFilename.startswith(RemapFrom)) {
+        RemappedFilenames[Filename] =
+            RemapTo + NativeFilename.substr(RemapFrom.size()).str();
+      }
+    }
+  }
+
   // Create an index out of the source files.
   if (ViewOpts.hasOutputDirectory()) {
     if (Error E = Printer->createIndexFile(SourceFiles, *Coverage)) {
       error("Could not create index file!", toString(std::move(E)));
       return 1;
     }
   }