[llvm] [lld] [Object][Wasm] Move WasmSymbolInfo directly into WasmSymbol (NFC) (PR #80219)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-objectyaml

Author: Derek Schuff (dschuff)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/80219.diff


5 Files Affected:

- (modified) lld/wasm/InputFiles.cpp (+10-10) 
- (modified) llvm/include/llvm/BinaryFormat/Wasm.h (+5-1) 
- (modified) llvm/include/llvm/Object/Wasm.h (+3-1) 
- (modified) llvm/lib/Object/WasmObjectFile.cpp (+2-7) 
- (modified) llvm/tools/obj2yaml/wasm2yaml.cpp (+2-1) 


``````````diff
diff --git a/lld/wasm/InputFiles.cpp b/lld/wasm/InputFiles.cpp
index f43c39b218787..60ee60d9a3aa9 100644
--- a/lld/wasm/InputFiles.cpp
+++ b/lld/wasm/InputFiles.cpp
@@ -322,20 +322,20 @@ void ObjFile::addLegacyIndirectFunctionTableIfNeeded(
     return;
   }
 
-  auto *info = make<WasmSymbolInfo>();
-  info->Name = tableImport->Field;
-  info->Kind = WASM_SYMBOL_TYPE_TABLE;
-  info->ImportModule = tableImport->Module;
-  info->ImportName = tableImport->Field;
-  info->Flags = WASM_SYMBOL_UNDEFINED;
-  info->Flags |= WASM_SYMBOL_NO_STRIP;
-  info->ElementIndex = 0;
-  LLVM_DEBUG(dbgs() << "Synthesizing symbol for table import: " << info->Name
+  WasmSymbolInfo info;
+  info.Name = tableImport->Field;
+  info.Kind = WASM_SYMBOL_TYPE_TABLE;
+  info.ImportModule = tableImport->Module;
+  info.ImportName = tableImport->Field;
+  info.Flags = WASM_SYMBOL_UNDEFINED;
+  info.Flags |= WASM_SYMBOL_NO_STRIP;
+  info.ElementIndex = 0;
+  LLVM_DEBUG(dbgs() << "Synthesizing symbol for table import: " << info.Name
                     << "\n");
   const WasmGlobalType *globalType = nullptr;
   const WasmSignature *signature = nullptr;
   auto *wasmSym =
-      make<WasmSymbol>(*info, globalType, &tableImport->Table, signature);
+      make<WasmSymbol>(info, globalType, &tableImport->Table, signature);
   Symbol *sym = createUndefined(*wasmSym, false);
   // We're only sure it's a TableSymbol if the createUndefined succeeded.
   if (errorCount())
diff --git a/llvm/include/llvm/BinaryFormat/Wasm.h b/llvm/include/llvm/BinaryFormat/Wasm.h
index cd13b7014bfe2..aec6ea0b75779 100644
--- a/llvm/include/llvm/BinaryFormat/Wasm.h
+++ b/llvm/include/llvm/BinaryFormat/Wasm.h
@@ -467,11 +467,15 @@ struct WasmDebugName {
   StringRef Name;
 };
 
+// Info from the linking metadata section of a wasm object file.
 struct WasmLinkingData {
   uint32_t Version;
   std::vector<WasmInitFunc> InitFunctions;
   std::vector<StringRef> Comdats;
-  std::vector<WasmSymbolInfo> SymbolTable;
+  // The linking section also contains a symbol table. This info (represented
+  // in a WasmSymbolInfo struct) is stored inside the WasmSymbol object instead
+  // of in this structure; this allows vectors of WasmSymbols and
+  // WasmLinkingDatas to be reallocated.
 };
 
 struct WasmSignature {
diff --git a/llvm/include/llvm/Object/Wasm.h b/llvm/include/llvm/Object/Wasm.h
index 927dce882f6ae..13d9a17e24c3d 100644
--- a/llvm/include/llvm/Object/Wasm.h
+++ b/llvm/include/llvm/Object/Wasm.h
@@ -43,7 +43,9 @@ class WasmSymbol {
     assert(!Signature || Signature->Kind != wasm::WasmSignature::Placeholder);
   }
 
-  const wasm::WasmSymbolInfo &Info;
+  // Symbol info as represented in the symbol's 'syminfo' entry of an object
+  // file's symbol table.
+  wasm::WasmSymbolInfo Info;
   const wasm::WasmGlobalType *GlobalType;
   const wasm::WasmTableType *TableType;
   const wasm::WasmSignature *Signature;
diff --git a/llvm/lib/Object/WasmObjectFile.cpp b/llvm/lib/Object/WasmObjectFile.cpp
index 953e7c70b5f6e..7e10bd8071aee 100644
--- a/llvm/lib/Object/WasmObjectFile.cpp
+++ b/llvm/lib/Object/WasmObjectFile.cpp
@@ -642,9 +642,7 @@ Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) {
   uint32_t Count = readVaruint32(Ctx);
   // Clear out any symbol information that was derived from the exports
   // section.
-  LinkingData.SymbolTable.clear();
   Symbols.clear();
-  LinkingData.SymbolTable.reserve(Count);
   Symbols.reserve(Count);
   StringSet<> SymbolNames;
 
@@ -844,8 +842,7 @@ Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) {
       return make_error<GenericBinaryError>("duplicate symbol name " +
                                                 Twine(Info.Name),
                                             object_error::parse_failed);
-    LinkingData.SymbolTable.emplace_back(Info);
-    Symbols.emplace_back(LinkingData.SymbolTable.back(), GlobalType, TableType,
+    Symbols.emplace_back(Info, GlobalType, TableType,
                          Signature);
     LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n");
   }
@@ -1390,7 +1387,6 @@ Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) {
 Error WasmObjectFile::parseExportSection(ReadContext &Ctx) {
   uint32_t Count = readVaruint32(Ctx);
   Exports.reserve(Count);
-  LinkingData.SymbolTable.reserve(Count);
   Symbols.reserve(Count);
   for (uint32_t I = 0; I < Count; I++) {
     wasm::WasmExport Ex;
@@ -1455,8 +1451,7 @@ Error WasmObjectFile::parseExportSection(ReadContext &Ctx) {
     }
     Exports.push_back(Ex);
     if (Ex.Kind != wasm::WASM_EXTERNAL_MEMORY) {
-      LinkingData.SymbolTable.emplace_back(Info);
-      Symbols.emplace_back(LinkingData.SymbolTable.back(), GlobalType,
+      Symbols.emplace_back(Info, GlobalType,
                            TableType, Signature);
       LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n");
     }
diff --git a/llvm/tools/obj2yaml/wasm2yaml.cpp b/llvm/tools/obj2yaml/wasm2yaml.cpp
index c15d64cef8d65..397b1fd0ab81f 100644
--- a/llvm/tools/obj2yaml/wasm2yaml.cpp
+++ b/llvm/tools/obj2yaml/wasm2yaml.cpp
@@ -124,7 +124,8 @@ WasmDumper::dumpCustomSection(const WasmSection &WasmSec) {
     }
 
     uint32_t SymbolIndex = 0;
-    for (const wasm::WasmSymbolInfo &Symbol : Obj.linkingData().SymbolTable) {
+    for (const object::SymbolRef &Sym : Obj.symbols()) {
+      const wasm::WasmSymbolInfo& Symbol = Obj.getWasmSymbol(Sym).Info;
       WasmYAML::SymbolInfo Info;
       Info.Index = SymbolIndex++;
       Info.Kind = static_cast<uint32_t>(Symbol.Kind);

``````````

</details>


https://github.com/llvm/llvm-project/pull/80219