Build: Produce C/JS code coverage reports from make

Makefile

@@ -10,6 +10,7 @@ TEST_CI_ARGS ?=
 STAGINGSERVER ?= node-www
 LOGLEVEL ?= silent
 OSTYPE := $(shell uname -s | tr '[A-Z]' '[a-z]')
+COVTESTS ?= test
 
 ifdef JOBS
   PARALLEL_ARGS = -j $(JOBS)
@@ -113,6 +114,69 @@ distclean:
 
 check: test
 
+# Remove files generated by running coverage, put the non-instrumented lib back 
+# in place 
+coverage-clean:
+	if [ -d lib_ ]; then rm -rf lib; mv lib_ lib; fi
+	-rm -rf node_modules
+	-rm -rf gcovr testing
+	-rm -rf out/$(BUILDTYPE)/.coverage
+	-rm -rf .cov_tmp coverage
+	-rm -f out/$(BUILDTYPE)/obj.target/node/src/*.gcda
+	-rm -f out/$(BUILDTYPE)/obj.target/node/src/tracing/*.gcda
+	-rm -f out/$(BUILDTYPE)/obj.target/node/src/*.gcno
+	-rm -f out/$(BUILDTYPE)/obj.target/node/src/tracing*.gcno
+
+# Build and test with code coverage reporting.  Leave the lib directory 
+# instrumented for any additional runs the user may want to make.
+# For C++ coverage reporting, this needs to be run in conjunction with configure
+#  --coverage.  html coverage reports will be created under coverage/
+
+coverage: coverage-test
+
+coverage-build: all
+	mkdir -p node_modules
+	if [ ! -d node_modules/istanbul-merge ]; then \
+		$(NODE) ./deps/npm install istanbul-merge; fi
+	if [ ! -d node_modules/nyc ]; then $(NODE) ./deps/npm install nyc; fi
+	if [ ! -d gcovr ]; then git clone --depth=1 \
+		--single-branch git://github.com/gcovr/gcovr.git; fi
+	if [ ! -d testing ]; then git clone --depth=1 \
+		--single-branch https://github.com/nodejs/testing.git; fi
+	if [ ! -f gcovr/scripts/gcovr.orig ]; then \
+		(cd gcovr && patch -N -p1 < \
+		"$(CURDIR)/testing/coverage/gcovr-patches.diff"); fi
+	if [ -d lib_ ]; then rm -rf lib; mv lib_ lib; fi
+	mv lib lib_
+	$(NODE) ./node_modules/.bin/nyc instrument lib_/ lib/ 
+	$(MAKE)
+
+coverage-test: coverage-build
+	-rm -rf out/$(BUILDTYPE)/.coverage
+	-rm -rf .cov_tmp
+	-rm -f out/$(BUILDTYPE)/obj.target/node/src/*.gcda
+	-rm -f out/$(BUILDTYPE)/obj.target/node/src/tracing/*.gcda
+	-$(MAKE) $(COVTESTS)
+	mv lib lib__ 
+	mv lib_ lib
+	mkdir -p coverage .cov_tmp
+	$(NODE) ./node_modules/.bin/istanbul-merge --out \
+        	.cov_tmp/libcov.json 'out/Release/.coverage/coverage-*.json'
+	(cd lib && .$(NODE) ../node_modules/.bin/nyc report \
+		--temp-directory "$(CURDIR)/.cov_tmp" -r html \
+		--report-dir "../coverage")
+	-(cd out && "../gcovr/scripts/gcovr" --gcov-exclude='.*deps' \
+		--gcov-exclude='.*usr' -v -r Release/obj.target/node \
+		--html --html-detail -o ../coverage/cxxcoverage.html)
+	mv lib lib_
+	mv lib__ lib
+	@echo -n "Javascript coverage %: "
+	@grep -B1 Lines coverage/index.html | head -n1 \
+		| sed 's/<[^>]*>//g'| sed 's/ //g'
+	@echo -n "C++ coverage %: "
+	@grep -A3 Lines coverage/cxxcoverage.html | grep style  \
+		| sed 's/<[^>]*>//g'| sed 's/ //g'
+
 cctest: all
 	@out/$(BUILDTYPE)/$@
 
@@ -781,4 +845,5 @@ endif
 	bench-all bench bench-misc bench-array bench-buffer bench-net \
 	bench-http bench-fs bench-tls cctest run-ci test-v8 test-v8-intl \
 	test-v8-benchmarks test-v8-all v8 lint-ci bench-ci jslint-ci doc-only \
-	$(TARBALL)-headers test-ci test-ci-native test-ci-js build-ci clear-stalled
+	$(TARBALL)-headers test-ci test-ci-native test-ci-js build-ci clear-stalled \
+	coverage-clean coverage-build coverage-test coverage

lib/internal/bootstrap_node.js

@@ -44,6 +44,8 @@
     NativeModule.require('internal/process/stdio').setup();
     _process.setupKillAndExit();
     _process.setupSignalHandlers();
+    if (global.__coverage__)
+      NativeModule.require('internal/process/write-coverage').setup();
 
     // Do not initialize channel in debugger agent, it deletes env variable
     // and the main thread won't see it.

lib/internal/process/write-coverage.js

@@ -0,0 +1,46 @@
+'use strict';
+const process = require('process');
+const path = require('path');
+const fs = require('fs');
+const mkdirSync = fs.mkdirSync;
+const writeFileSync = fs.writeFileSync;
+
+var isWritingCoverage = false;
+function writeCoverage() {
+  if (isWritingCoverage || !global.__coverage__) {
+    return;
+  }
+  isWritingCoverage = true;
+
+  const dirname = path.join(path.dirname(process.execPath), '.coverage');
+  const filename = `coverage-${process.pid}-${Date.now()}.json`;
+  try {
+    mkdirSync(dirname);
+  } catch (err) {
+    if (err.code !== 'EEXIST') {
+      console.error(err);
+      return;
+    }
+  }
+
+  const target = path.join(dirname, filename);
+  const coverageInfo = JSON.stringify(global.__coverage__);
+  try {
+    writeFileSync(target, coverageInfo);
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+function setup() {
+  const reallyReallyExit = process.reallyExit;
+
+  process.reallyExit = function(code) {
+    writeCoverage();
+    reallyReallyExit(code);
+  };
+
+  process.on('exit', writeCoverage);
+}
+
+exports.setup = setup;

node.gyp

@@ -94,6 +94,7 @@
       'lib/internal/process/warning.js',
       'lib/internal/process.js',
       'lib/internal/querystring.js',
+      'lib/internal/process/write-coverage.js',
       'lib/internal/readline.js',
       'lib/internal/repl.js',
       'lib/internal/socket_list.js',

test/common.js

@@ -287,6 +287,9 @@ exports.platformTimeout = function(ms) {
   if (process.config.target_defaults.default_configuration === 'Debug')
     ms = 2 * ms;
 
+  if (global.__coverage__)
+    ms = 4 * ms;
+
   if (exports.isAix)
     return 2 * ms; // default localhost speed is slower on AIX
 
@@ -384,7 +387,11 @@ function leakedGlobals() {
     if (!knownGlobals.includes(global[val]))
       leaked.push(val);
 
-  return leaked;
+  if (global.__coverage__) {
+    return leaked.filter((varname) => !/^(cov_|__cov)/.test(varname));
+  } else {
+    return leaked;
+  }
 }
 exports.leakedGlobals = leakedGlobals;