Add a parser for gcov intermediate file format.

This change comes as a preparation for using gcov for Bazel C++ coverage
instead of lcov.

See documentation of gcov intermediate format at https://gcc.gnu.org/onlinedocs/gcc/Invoking-Gcov.html#Invoking-Gcov
under --intermediate-format.

Change-Id: I6cd2df8b3a6611b187a2b0c161b14388413bc670
PiperOrigin-RevId: 206940660

1 files changed, 15 insertions, 0 deletions

diff --git a/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Coverage.java b/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Coverage.java
index 82733aa84a..75eaa420cc 100644
--- a/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Coverage.java
+++ b/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Coverage.java
@@ -34,6 +34,21 @@ class Coverage {
     }
   }
 
+  static Coverage merge(Coverage c1, Coverage c2) {
+    Coverage merged = new Coverage();
+    for (SourceFileCoverage sourceFile : c1.getAllSourceFiles()) {
+      merged.add(sourceFile);
+    }
+    for (SourceFileCoverage sourceFile : c2.getAllSourceFiles()) {
+      merged.add(sourceFile);
+    }
+    return merged;
+  }
+
+  boolean isEmpty() {
+    return sourceFiles.isEmpty();
+  }
+
   Collection<SourceFileCoverage> getAllSourceFiles() {
     return sourceFiles.values();
   }