Add support for GCOV JSON intermediate format

CHANGELOG.rst

@@ -15,6 +15,7 @@ New features and notable changes:
 - In Azure pipelines or GitHub actions errors and warnings are printed in an additional format captured by the CI. (:issue:`904`)
 - Detect suspicious counter values in ``gcov`` output. (:issue:`903`)
 - Add :option:`--html-single-page` to create a single page report (static or with Javascript). (:issue:`916`)
+- Add support for GCOV JSON intermediate format. (:issue:`766`)
 
 Bug fixes and small improvements:
 

CONTRIBUTING.rst

@@ -239,9 +239,9 @@ Path                    Description
 ======================= =======================================================
 
 The program entrypoint and command line interface is in ``gcovr/__main__.py``.
-The coverage data is parsed in the ``gcovr.gcov`` module.
+The coverage data is parsed in the ``gcovr.formats.gcov`` module.
 The HTML, XML, text, and summary reports
-are in ``gcovr.generator.html`` and respective modules.
+are in ``gcovr.formats.html`` and respective modules.
 
 .. _test suite:
 

doc/examples/example_cmake.sh

@@ -45,6 +45,6 @@ cd $BLD_DIR
 (
 #BEGIN cmake_gcovr
 cd $BLD_DIR
-gcovr -r $SRC_DIR . --txt example_cmake.txt
+gcovr -r $SRC_DIR . --txt ../../example_cmake.txt
 #END cmake_gcovr
 )

doc/examples/test_examples.py

@@ -52,7 +52,9 @@ def find_test_cases():
         basename = os.path.basename(script)
         name, _ = os.path.splitext(basename)
         for format in "txt cobertura csv json html".split():
-            if format == "html" and is_compiler(os.getenv("CC"), "gcc-5", "gcc-6"):
+            if format == "html" and is_compiler(
+                os.getenv("CC"), "gcc-5", "gcc-6", "gcc-14"
+            ):
                 continue
             baseline = "{datadir}/{name}.{ext}".format(
                 datadir=datadir,

doc/source/faq.rst

@@ -150,5 +150,6 @@ Following options are always used:
 
 Following options are only used if available:
 
+- ``--json-format``: Use JSON intermediate format. Can only be used if no calls are needed in the report.
 - ``--demangled-names``: Not available for LLVM based ``gcov``.
 - ``--hash-filenames``: Available since GCC 7, as fallback the option ``--preserve-paths`` is used.

doc/source/guide/filters.rst

@@ -58,7 +58,7 @@ and must not match any :option:`-e/--exclude<gcovr --exclude>` filter.
 
 The :option:`--gcov-filter<gcovr --gcov-filter>`
 and :option:`--gcov-exclude<gcovr --gcov-exclude>` filters apply to the
-``.gcov`` files created by ``gcov``.
+``.gcov`` / ``.json.gz`` files created by ``gcov``.
 This is useful mostly when running gcov yourself,
 and then invoking gcovr with :option:`-g/--gcov-use-existing-files<gcovr --gcov-use-existing-files>`.
 But these filters also apply when gcov is launched by gcovr.

gcovr/formats/coveralls/write.py

@@ -186,12 +186,14 @@ def _make_source_file(coverage_details: FileCoverage, options) -> Dict[str, Any]
     source_file = {}
 
     # Generate md5 hash of file contents
-    with open(coverage_details.filename, "rb") as file_handle:
-        contents = file_handle.read()
-
-    source_file["source_digest"] = get_md5_hexdigest(contents)
+    if coverage_details.filename.endswith("<stdin>"):
+        total_line_count = None
+    else:
+        with open(coverage_details.filename, "rb") as file_handle:
+            contents = file_handle.read()
 
-    total_line_count = len(contents.splitlines())
+        source_file["source_digest"] = get_md5_hexdigest(contents)
+        total_line_count = len(contents.splitlines())
 
     # Isolate relative file path
     relative_file_path = presentable_filename(
@@ -229,7 +231,8 @@ def _make_source_file(coverage_details: FileCoverage, options) -> Dict[str, Any]
         #     source_file['coverage'].append(b_hits)
 
     # add trailing empty lines
-    _extend_with_none(source_file["coverage"], total_line_count)
+    if total_line_count is not None:
+        _extend_with_none(source_file["coverage"], total_line_count)
 
     return source_file