Internals: Fix misc internal coverage holes. No functional change intended.

.codacy.yml

@@ -3,3 +3,4 @@ exclude_paths:
   - '.github/**'
   - 'ci/build_verilator.sh'
   - 'include/vltstd/**'
+  - 'nodist/fastcov.py'

nodist/code_coverage

@@ -18,6 +18,7 @@ use vars qw($Debug);
 
 our $Opt_Stop = 1;
 our $Opt_Fastcov = 1;
+our $Exclude_Branch_Regexp;
 our $Exclude_Line_Regexp;
 our $Remove_Gcda_Regexp;
 
@@ -312,6 +313,7 @@ sub test {
 sub clone_sources {
     my $cc_dir = shift;
     my $excluded_lines = 0;
+    my $excluded_br_lines = 0;
     foreach my $glob (@Source_Globs) {
         foreach my $infile (glob $glob) {
             $infile !~ m!^/!
@@ -334,10 +336,15 @@ sub clone_sources {
                 elsif ($line =~ /LCOV_EXCL_STOP/) {
                     $line .= " LCOV_EXCL_BR_STOP";
                 }
-                elsif ($line !~ m!// LCOV_EXCL_LINE!
-                    && $line =~ /$Exclude_Line_Regexp/) {
+                elsif ($line =~ /$Exclude_Line_Regexp/) {
                     $line .= "  //code_coverage: // LCOV_EXCL_LINE LCOV_EXCL_BR_LINE";
                     $excluded_lines++;
+                    $excluded_br_lines++;
+                    #print "$infile:$lineno: $line";
+                }
+                elsif ($line =~ /$Exclude_Branch_Regexp/) {
+                    $line .= "  //code_coverage: // LCOV_EXCL_BR_LINE";
+                    $excluded_br_lines++;
                     #print "$infile:$lineno: $line";
                 }
                 $ofh->print("$line\n");
@@ -345,6 +352,7 @@ sub clone_sources {
         }
     }
     print "Number of source lines automatically LCOV_EXCL_LINE'ed: $excluded_lines\n";
+    print "Number of source lines automatically LCOV_EXCL_BR_LINE'ed: $excluded_br_lines\n";
 }
 
 sub cleanup_abs_paths_info {
@@ -388,6 +396,9 @@ sub cleanup_abs_paths_json {
 #######################################################################
 # .dat file callbacks
 
+sub exclude_branch_regexp {
+    $Exclude_Branch_Regexp = shift;
+}
 sub exclude_line_regexp {
     $Exclude_Line_Regexp = shift;
 }

nodist/code_coverage.dat

@@ -42,6 +42,7 @@ remove_source("*examples/*");
 # Would just be removed with remove_source in later step
 remove_gcda_regexp(qr!test_regress/.*/(Vt_|Vtop_).*\.gcda!);
 
+# Exclude line entirely, also excludes from function and branch coverage
 exclude_line_regexp(qr/(\bv3fatalSrc\b
                     |\bfatalSrc\b
                     |\bVL_UNCOVERABLE\b
@@ -51,4 +52,7 @@ exclude_line_regexp(qr/(\bv3fatalSrc\b
                     |\bV3ERROR_NA
                     |\bUINFO\b)/x);
 
+# Exclude for branch coverage only
+exclude_branch_regexp(qr/(\bdebug\(\))/x);
+
 1;

src/V3Case.cpp

@@ -280,13 +280,13 @@ private:
         //                      IF(msb-1, 01, 00))
         AstNode* cexprp = nodep->exprp()->unlinkFrBack();
 
-        if (debug() >= 9) {
+        if (debug() >= 9) {  // LCOV_EXCL_START
             for (uint32_t i = 0; i < (1UL << m_caseWidth); ++i) {
                 if (AstNode* itemp = m_valueItem[i]) {
                     UINFO(9, "Value " << std::hex << i << " " << itemp << endl);
                 }
             }
-        }
+        }  // LCOV_EXCL_STOP
 
         // Handle any assertions
         replaceCaseParallel(nodep, m_caseNoOverlapsAllCovered);

src/V3FileLine.cpp

@@ -390,14 +390,14 @@ string FileLine::warnOther() const {
 }
 
 string FileLine::source() const {
-    if (VL_UNCOVERABLE(!m_contentp)) {
+    if (VL_UNCOVERABLE(!m_contentp)) {  // LCOV_EXCL_START
         if (debug() || v3Global.opt.debugCheck()) {
             // The newline here is to work around the " <line#> | "
             return "\n%Error: internal tracking of file contents failed";
         } else {
             return "";
         }
-    }
+    }  // LCOV_EXCL_STOP
     return m_contentp->getLine(m_contentLineno);
 }
 string FileLine::prettySource() const {

src/V3Options.cpp

@@ -329,9 +329,9 @@ void V3Options::fileNfsFlush(const string& filename) {
     // NFS caches stat() calls so to get up-to-date information must
     // do a open or opendir on the filename.
     // Faster to just try both rather than check if a file is a dir.
-    if (DIR* dirp = opendir(filename.c_str())) {
+    if (DIR* dirp = opendir(filename.c_str())) {  // LCOV_EXCL_BR_LINE
         closedir(dirp);  // LCOV_EXCL_LINE
-    } else if (int fd = ::open(filename.c_str(), O_RDONLY)) {
+    } else if (int fd = ::open(filename.c_str(), O_RDONLY)) {  // LCOV_EXCL_BR_LINE
         if (fd > 0) ::close(fd);
     }
 }
@@ -667,13 +667,13 @@ string V3Options::protectKeyDefaulted() {
     return m_protectKey;
 }
 
-void V3Options::throwSigsegv() {
+void V3Options::throwSigsegv() {  // LCOV_EXCL_START
 #if !(defined(VL_CPPCHECK) || defined(__clang_analyzer__))
     // clang-format off
     { char* zp = NULL; *zp = 0; }  // Intentional core dump, ignore warnings here
     // clang-format on
 #endif
-}
+}  // LCOV_EXCL_STOP
 
 VTimescale V3Options::timeComputePrec(const VTimescale& flag) const {
     if (!timeOverridePrec().isNone()) {