Measure branch and method coverage for `make test-all`

To measure coverage of C code:
`./configure --enable-gcov && make && make exam && make lcov`

To measure coverage of Ruby code:
`./configure && make && make exam COVERAGE=true && make lcov`

To measure coverage of both languages at a time:
`./configure --enable-gcov && make && make exam COVERAGE=true && make lcov`

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59890 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 83 insertions, 11 deletions

diff --git a/tool/run-lcov.rb b/tool/run-lcov.rb
index daf52e69b3..47f4591463 100644
--- a/tool/run-lcov.rb
+++ b/tool/run-lcov.rb
@@ -50,6 +50,61 @@ def gen_rb_lcov(file)
   end
 end
 
+def gen_rb_lcov(file)
+  res = Marshal.load(File.binread(file))
+
+  open("lcov-rb-all.info", "w") do |f|
+    f.puts "TN:" # no test name
+    base_dir = File.dirname(File.dirname(__dir__))
+    res.each do |path, cov|
+      next unless path.start_with?(base_dir)
+      next if path.start_with?(File.join(base_dir, "test"))
+      f.puts "SF:#{ path }"
+
+      # function coverage
+      total = covered = 0
+      cov[:methods].each do |(name, lineno), count|
+        f.puts "FN:#{ lineno },#{ name }"
+        total += 1
+        covered += 1 if count > 0
+      end
+      f.puts "FNF:#{ total }"
+      f.puts "FNF:#{ covered }"
+      cov[:methods].each do |(name, _), count|
+        f.puts "FNDA:#{ count },#{ name }"
+      end
+
+      # line coverage
+      total = covered = 0
+      cov[:lines].each_with_index do |count, lineno|
+        next unless count
+        f.puts "DA:#{ lineno + 1 },#{ count }"
+        total += 1
+        covered += 1 if count > 0
+      end
+      f.puts "LF:#{ total }"
+      f.puts "LH:#{ covered }"
+
+      # branch coverage
+      total = covered = 0
+      id = 0
+      cov[:branches].each do |(base_type, base_lineno), targets|
+        i = 0
+        targets.each do |(target_type, target_lineno), count|
+          f.puts "BRDA:#{ base_lineno },#{ id },#{ i },#{ count }"
+          total += 1
+          covered += 1 if count > 0
+          i += 1
+        end
+        id += 1
+      end
+      f.puts "BRF:#{ total }"
+      f.puts "BRH:#{ covered }"
+      f.puts "end_of_record"
+    end
+  end
+end
+
 gcda_files = Pathname.glob("**/*.gcda")
 ext_gcda_files = gcda_files.select {|f| f.fnmatch("ext/*") }
 rubyspec_temp_gcda_files = gcda_files.select {|f| f.fnmatch("rubyspec_temp/*") }
@@ -67,16 +122,16 @@ backup_gcda_files(rubyspec_temp_gcda_files) do
   end
 end
 if $info_files != []
-  system("lcov", *$info_files.flat_map {|f| ["-a", f] }, "-o", "lcov-c-all.info")
-  system("genhtml", "--ignore-errors", "source", "lcov-c-all.info", "-o", "lcov-c-out")
+  system("lcov", *$info_files.flat_map {|f| ["-a", f] }, "--rc", "lcov_branch_coverage=1", "-o", "lcov-c-all.info")
+  system("genhtml", "--branch-coverage", "--ignore-errors", "source", "lcov-c-all.info", "-o", "lcov-c-out")
 end
 
 if File.readable?("test-coverage.dat")
   gen_rb_lcov("test-coverage.dat")
-  system("genhtml", "--ignore-errors", "source", "lcov-rb-all.info", "-o", "lcov-rb-out")
+  system("genhtml", "--branch-coverage", "--ignore-errors", "source", "lcov-rb-all.info", "-o", "lcov-rb-out")
 end
 
 if File.readable?("lcov-c-all.info") && File.readable?("lcov-rb-all.info")
-  system("lcov", "-a", "lcov-c-all.info", "-a", "lcov-rb-all.info", "-o", "lcov-all.info") || raise
-  system("genhtml", "--ignore-errors", "source", "lcov-all.info", "-o", "lcov-out")
+  system("lcov", "-a", "lcov-c-all.info", "-a", "lcov-rb-all.info", "--rc", "lcov_branch_coverage=1", "-o", "lcov-all.info") || raise
+  system("genhtml", "--branch-coverage", "--ignore-errors", "source", "lcov-all.info", "-o", "lcov-out")
 end
diff --git a/tool/test-coverage.rb b/tool/test-coverage.rb
index 0c002f4d1a..0719e5e703 100644
--- a/tool/test-coverage.rb
+++ b/tool/test-coverage.rb
@@ -1,6 +1,7 @@
 require "coverage"
 
-Coverage.start
+ENV["COVERAGE_EXPERIMENTAL_MODE"] = "true"
+Coverage.start(lines: true, branches: true, methods: true)
 
 TEST_COVERAGE_DATA_FILE = "test-coverage.dat"
 
@@ -8,14 +9,22 @@ def merge_coverage_data(res1, res2)
   res1.each do |path, cov1|
     cov2 = res2[path]
     if cov2
-      cov1.each_with_index do |count1, i|
+      cov1[:lines].each_with_index do |count1, i|
         next unless count1
-        if cov2[i]
-          cov2[i] += count1
+        add_count(cov2[:lines], i, count1)
+      end
+      cov1[:branches].each do |base_key, targets1|
+        if cov2[:branches][base_key]
+          targets1.each do |target_key, count1|
+            add_count(cov2[:branches][base_key], target_key, count1)
+          end
         else
-          cov2[i] = count1
+          cov2[:branches][base_key] = targets1
         end
       end
+      cov1[:methods].each do |key, count1|
+        add_count(cov2[:methods], key, count1)
+      end
     else
       res2[path] = cov1
     end
@@ -23,6 +32,14 @@ def merge_coverage_data(res1, res2)
   res2
 end
 
+def add_count(h, key, count)
+  if h[key]
+    h[key] += count
+  else
+    h[key] = count
+  end
+end
+
 def save_coverage_data(res1)
   File.open(TEST_COVERAGE_DATA_FILE, File::RDWR | File::CREAT | File::BINARY) do |f|
     f.flock(File::LOCK_EX)
@@ -49,7 +66,7 @@ def invoke_simplecov_formatter
   res.each do |path, cov|
     next unless path.start_with?(base_dir)
     next if path.start_with?(File.join(base_dir, "test"))
-    simplecov_result[path] = cov
+    simplecov_result[path] = cov[:lines]
   end
 
   res = SimpleCov::Result.new(simplecov_result)