[WebAssembly] Implement --print-gc-sections for synthetic functions

Enables cleaning up confusion between which name variables are mangled
and which are unmangled, and --print-gc-sections then excersises and
tests that.

Differential Revision: https://reviews.llvm.org/D44440

llvm-svn: 330449

1 files changed, 7 insertions, 3 deletions

diff --git a/lld/wasm/Writer.cpp b/lld/wasm/Writer.cpp
index 18d5d4a8d52..4a52b526ae3 100644
--- a/lld/wasm/Writer.cpp
+++ b/lld/wasm/Writer.cpp
@@ -534,7 +534,7 @@ void Writer::createLinkingSection() {
 void Writer::createNameSection() {
   unsigned NumNames = NumImportedFunctions;
   for (const InputFunction *F : InputFunctions)
-    if (!F->getName().empty())
+    if (!F->getName().empty() || !F->getDebugName().empty())
       ++NumNames;
 
   if (NumNames == 0)
@@ -558,8 +558,12 @@ void Writer::createNameSection() {
   for (const InputFunction *F : InputFunctions) {
     if (!F->getName().empty()) {
       writeUleb128(Sub.OS, F->getFunctionIndex(), "func index");
-      Optional<std::string> Name = demangleItanium(F->getName());
-      writeStr(Sub.OS, Name ? StringRef(*Name) : F->getName(), "symbol name");
+      if (!F->getDebugName().empty()) {
+        writeStr(Sub.OS, F->getDebugName(), "symbol name");
+      } else {
+        Optional<std::string> Name = demangleItanium(F->getName());
+        writeStr(Sub.OS, Name ? StringRef(*Name) : F->getName(), "symbol name");
+      }
     }
   }