Reset wasmSym symbols before every linkerMain call

lld/wasm/Driver.cpp

@@ -131,7 +131,10 @@ bool link(ArrayRef<const char *> args, llvm::raw_ostream &stdoutOS,
   auto *context = new CommonLinkerContext;
 
   context->e.initialize(stdoutOS, stderrOS, exitEarly, disableOutput);
-  context->e.cleanupCallback = []() { ctx.reset(); };
+  context->e.cleanupCallback = []() {
+    ctx.reset();
+    WasmSym::reset();  // manually clear globals
+  };
   context->e.logName = args::getFilenameWithoutExe(args[0]);
   context->e.errorLimitExceededMsg =
       "too many errors emitted, stopping now (use "

lld/wasm/Symbols.cpp

@@ -104,6 +104,35 @@ UndefinedGlobal *WasmSym::memoryBase;
 DefinedData *WasmSym::definedMemoryBase;
 TableSymbol *WasmSym::indirectFunctionTable;
 
+void WasmSym::reset() {
+  callCtors = nullptr;
+  callDtors = nullptr;
+  initMemory = nullptr;
+  applyGlobalRelocs = nullptr;
+  applyTLSRelocs = nullptr;
+  applyGlobalTLSRelocs = nullptr;
+  initTLS = nullptr;
+  firstPageEnd = nullptr;
+  startFunction = nullptr;
+  dsoHandle = nullptr;
+  dataEnd = nullptr;
+  globalBase = nullptr;
+  heapBase = nullptr;
+  heapEnd = nullptr;
+  initMemoryFlag = nullptr;
+  stackPointer = nullptr;
+  stackLow = nullptr;
+  stackHigh = nullptr;
+  tlsBase = nullptr;
+  tlsSize = nullptr;
+  tlsAlign = nullptr;
+  tableBase = nullptr;
+  definedTableBase = nullptr;
+  memoryBase = nullptr;
+  definedMemoryBase = nullptr;
+  indirectFunctionTable = nullptr;
+}
+
 WasmSymbolType Symbol::getWasmType() const {
   if (isa<FunctionSymbol>(this))
     return WASM_SYMBOL_TYPE_FUNCTION;

lld/wasm/Symbols.h

@@ -539,6 +539,7 @@ class LazySymbol : public Symbol {
 
 // linker-generated symbols
 struct WasmSym {
+  static void reset();
   // __global_base
   // Symbol marking the start of the global section.
   static DefinedData *globalBase;