[ELD] Add link statistics to MapDetail options

Register link-stats-details with the existing MapDetail mechanism so
detailed link statistics can be enabled with:

  --MapDetail=link-stats-details

Fix: #2303

Signed-off-by: Steven Ramirez Rosa <ramirezr@qti.qualcomm.com>

Author: Steven6798

include/eld/LayoutMap/LayoutInfo.h

@@ -83,7 +83,8 @@ class LayoutInfo {
     ShowTiming = 0x20,
     ShowDebugStrings = 0x40,
     ShowRelativePath = 0x80,
-    ShowInitialLayout = 0x100
+    ShowInitialLayout = 0x100,
+    ShowLinkStatsDetails = 0x200
   };
 
   enum InputKindPrefix {
@@ -211,6 +212,10 @@ class LayoutInfo {
 
   bool showInitialLayout() const { return LayoutDetail & ShowInitialLayout; }
 
+  bool showLinkStatsDetails() const {
+    return LayoutDetail & ShowLinkStatsDetails;
+  }
+
   static eld::Expected<void> setLayoutDetail(llvm::StringRef Option,
                                              DiagnosticEngine *);
 

lib/LayoutMap/LayoutInfo.cpp

@@ -183,6 +183,7 @@ LayoutInfo::setLayoutDetail(llvm::StringRef Option,
           .Case("show-timing", ShowTiming)
           .Case("show-debug-strings", ShowDebugStrings)
           .Case("show-initial-layout", ShowInitialLayout)
+          .Case("link-stats-details", ShowLinkStatsDetails)
           .StartsWith(ShowRelativePathOptionStr, ShowRelativePath)
           .Default(0);
   LayoutDetail |= OptionLayoutDetail;

lib/LayoutMap/TextLayoutPrinter.cpp

@@ -166,6 +166,8 @@ void TextLayoutPrinter::printStats(LayoutInfo::Stats &L,
   outputStream() << "# "
                  << "LinkStats Begin"
                  << "\n";
+  if (ThisLayoutInfo->showLinkStatsDetails())
+    outputStream() << "# Detailed link stats enabled\n";
   printStat("ObjectFiles", L.NumElfObjectFiles);
   printStat("ExecutableFiles", L.NumElfExecutableFiles);
   printStat("LinkerScripts", L.NumLinkerScripts);

test/Common/standalone/Map/LinkStatsDetails/Inputs/1.c

@@ -0,0 +1 @@
+int main() { return 0; }

test/Common/standalone/Map/LinkStatsDetails/LinkStatsDetails.test

@@ -0,0 +1,12 @@
+#---LinkStatsDetails.test----------------------- Executable -----------------#
+#BEGIN_COMMENT
+# This tests that detailed link statistics can be enabled with MapDetail.
+#END_COMMENT
+#START_TEST
+RUN: %clang %clangopts -c %p/Inputs/1.c -o %t.1.o
+RUN: %link %linkopts %t.1.o -M --MapDetail=link-stats-details -o %t.1.out 2>&1 | %filecheck %s --check-prefix=ENABLED
+RUN: %link %linkopts %t.1.o -M -o %t.2.out 2>&1 | %filecheck %s --check-prefix=DISABLED
+#END_TEST
+
+#ENABLED: # Detailed link stats enabled
+#DISABLED-NOT: # Detailed link stats enabled