kleaf: deduplicate gcov mappings

When Kleaf creates mappings for mixed build, it updates mappings from
base build. But these mappings may already contain the same folders like
OUT_DIR. This change uses dict to update existing mappings instead of
adding duplicate mapping.

Tested: bazel run --gcov //common-modules/virtual-device:virtual_device_x86_64_dist
Bug: 330338115
Change-Id: I68ff5ff25dd9233d1330ff896edab5036c91cd6d

1 files changed, 8 insertions, 6 deletions

diff --git a/kleaf/impl/print_gcno_mapping.py b/kleaf/impl/print_gcno_mapping.py
index 824ef1e..4368eda 100644
--- a/kleaf/impl/print_gcno_mapping.py
+++ b/kleaf/impl/print_gcno_mapping.py
@@ -20,17 +20,19 @@ from typing import TextIO, Optional
 
 
 def main(base: Optional[TextIO], mappings: list[str]):
-    result = []
+    mappings_dict = {}
     if base:
-        result = json.load(base)
+        for mapping in json.load(base):
+            mappings_dict[mapping["from"]] = mapping["to"]
 
     for mapping in mappings:
         from_val, to_val = mapping.split(":")
+        mappings_dict[from_val] = to_val
 
-        result.append({
-            "from": from_val,
-            "to": to_val,
-        })
+    result = [
+        {"from": from_val, "to": to_val}
+        for from_val, to_val in sorted(mappings_dict.items())
+    ]
 
     print(json.dumps(result, sort_keys=True, indent=2))