[WebAssembly] Improve invalid relocation error message

This message now matches the equivalent message in the ELF linker.

Differential Revision: https://reviews.llvm.org/D59860

llvm-svn: 357143

1 files changed, 17 insertions, 12 deletions

diff --git a/lld/wasm/Writer.cpp b/lld/wasm/Writer.cpp
index 480257f18bd..4697540e5e5 100644
--- a/lld/wasm/Writer.cpp
+++ b/lld/wasm/Writer.cpp
@@ -1141,18 +1141,6 @@ void Writer::processRelocations(InputChunk *Chunk) {
       File->TypeMap[Reloc.Index] = registerType(Types[Reloc.Index]);
       File->TypeIsUsed[Reloc.Index] = true;
       break;
-    case R_WASM_MEMORY_ADDR_SLEB:
-    case R_WASM_MEMORY_ADDR_I32:
-    case R_WASM_MEMORY_ADDR_LEB: {
-      DataSymbol *DataSym = File->getDataSymbol(Reloc.Index);
-      if (!Config->Relocatable && !isa<DefinedData>(DataSym) &&
-          !DataSym->isWeak())
-        error(File->getName() +
-              ": relocation of type R_WASM_MEMORY_ADDR_* "
-              "against undefined data symbol: " +
-              DataSym->getName());
-      break;
-    }
     case R_WASM_GLOBAL_INDEX_LEB: {
       auto* Sym = File->getSymbols()[Reloc.Index];
       if (!isa<GlobalSymbol>(Sym) && !Sym->isInGOT()) {
@@ -1161,6 +1149,23 @@ void Writer::processRelocations(InputChunk *Chunk) {
       }
     }
     }
+
+    if (!Config->Relocatable) {
+      switch (Reloc.Type) {
+      // These relocations types appear the code section.
+      // They should never appear in code compiled with -fPIC.
+      case R_WASM_TABLE_INDEX_SLEB:
+      case R_WASM_MEMORY_ADDR_I32:
+      case R_WASM_MEMORY_ADDR_LEB: {
+        auto *Sym = File->getSymbols()[Reloc.Index];
+        if (Sym->isUndefined() && !Sym->isWeak())
+          error(File->getName() + ": relocation " +
+                reloctTypeToString(Reloc.Type) +
+                " cannot be used againt symbol " + Sym->getName() +
+                "; recompile with -fPIC");
+      }
+      }
+    }
   }
 }