Bug 1751707 - Add configuration option to enable source-based coverag…

…e sanitizer r=nss-reviewers,mt

Differential Revision: https://phabricator.services.mozilla.com/D135764

build.sh

@@ -104,6 +104,7 @@ while [ $# -gt 0 ]; do
         --pprof) gyp_params+=(-Duse_pprof=1) ;;
         --asan) enable_sanitizer asan ;;
         --msan) enable_sanitizer msan ;;
+        --sourcecov) enable_sourcecov ;;
         --ubsan) enable_ubsan ;;
         --ubsan=?*) enable_ubsan "${1#*=}" ;;
         --fuzz) fuzz=1 ;;

coreconf/sanitizers.py

@@ -5,7 +5,7 @@
 
 def main():
     if len(sys.argv) < 2:
-        raise Exception('Specify either "asan", "msan", "sancov" or "ubsan" as argument.')
+        raise Exception('Specify either "asan", "msan", "sancov", "sourcecov" or "ubsan" as argument.')
 
     sanitizer = sys.argv[1]
     if sanitizer == "ubsan":
@@ -26,8 +26,11 @@ def main():
             raise Exception('sancov requires another argument (edge|bb|func).')
         print('-fsanitize-coverage='+sys.argv[2]+' ', end='')
         return
+    if sanitizer == "sourcecov":
+        print('-fprofile-instr-generate -fcoverage-mapping', end='')
+        return
 
-    raise Exception('Specify either "asan", "msan", "sancov" or "ubsan" as argument.')
+    raise Exception('Specify either "asan", "msan", "sancov", "sourcecov" or "ubsan" as argument.')
 
 if __name__ == '__main__':
     main()

coreconf/sanitizers.sh

@@ -42,6 +42,11 @@ enable_sancov()
     enable_sanitizer sancov "$sancov"
 }
 
+enable_sourcecov()
+{
+    enable_sanitizer sourcecov
+}
+
 enable_ubsan()
 {
     local ubsan

help.txt

@@ -32,6 +32,7 @@ NSS build tool options:
     --msan           enable memory sanitizer
     --ubsan          enable undefined behavior sanitizer
                      --ubsan=bool,shift,... sets specific UB sanitizers
+    --sourcecov      enable source-based coverage sanitizer
     --fuzz           build fuzzing targets (this always enables static builds)
                      --fuzz=tls to enable TLS fuzzing mode
                      --fuzz=oss to build for OSS-Fuzz