[WebAssembly] Add wasm symbol table support to llvm-objdump

[dschuff]

lib/Object/WasmObjectFile.cpp

680

Do we need the extra return as we had before, for non-asserts builds?

[sbc100]

• Store index values in WasmSymbol

[sbc100]

• cleanup getSymbolFlags

[sbc100]

lib/Object/WasmObjectFile.cpp

680

I cleaned this up to me more like the other object format.

[sbc100]

• Add missing breaks

include/llvm/Object/Wasm.h

public:
   enum class SymbolType {
     FUNCTION_IMPORT,
     FUNCTION_EXPORT,
     GLOBAL_IMPORT,
     GLOBAL_EXPORT,
     DEBUG_FUNCTION_NAME,
   };
 
-  WasmSymbol(StringRef Name, SymbolType Type) : Name(Name), Type(Type) {}
+  WasmSymbol(StringRef Name, SymbolType Type, uint32_t Section,
+             uint32_t ElementIndex)
+      : Name(Name), Type(Type), Section(Section), ElementIndex(ElementIndex) {}
 
   StringRef Name;
   SymbolType Type;
+  uint32_t Section;
+  uint32_t ElementIndex;
 };
 
 class WasmSection {
 public:
   WasmSection() = default;
 
   uint32_t Type = 0; // Section type (See below)
   uint32_t Offset = 0; // Offset with in the file

lib/Object/WasmObjectFile.cpp

 Error WasmObjectFile::parseNameSection(const uint8_t *Ptr, const uint8_t *End) {
   while (Ptr < End) {
     uint8_t Type = readVarint7(Ptr);
     uint32_t Size = readVaruint32(Ptr);
     switch (Type) {
     case wasm::WASM_NAMES_FUNCTION: {
       uint32_t Count = readVaruint32(Ptr);
       while (Count--) {
-        /*uint32_t Index =*/readVaruint32(Ptr);
+        uint32_t Index = readVaruint32(Ptr);
         StringRef Name = readString(Ptr);
         if (!Name.empty())
           Symbols.emplace_back(Name,
-                               WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME);
+                               WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME,
+                               Sections.size(), Index);
       }
       break;
     }
     // Ignore local names for now
     case wasm::WASM_NAMES_LOCAL:
     default:
       Ptr += Size;
       break;
if (Ptr != End)
     return make_error<GenericBinaryError>("Type section ended prematurely",
                                           object_error::parse_failed);
   return Error::success();
 }
 
 Error WasmObjectFile::parseImportSection(const uint8_t *Ptr, const uint8_t *End) {
   uint32_t Count = readVaruint32(Ptr);
   Imports.reserve(Count);
-  while (Count--) {
+  for (uint32_t i = 0; i < Count; i++) {
     wasm::WasmImport Im;
     Im.Module = readString(Ptr);
     Im.Field = readString(Ptr);
     Im.Kind = readUint8(Ptr);
     switch (Im.Kind) {
     case wasm::WASM_EXTERNAL_FUNCTION:
       Im.SigIndex = readVaruint32(Ptr);
-      Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::FUNCTION_IMPORT);
+      Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::FUNCTION_IMPORT,
+                           Sections.size(), i);
       break;
     case wasm::WASM_EXTERNAL_GLOBAL:
       Im.GlobalType = readVarint7(Ptr);
       Im.GlobalMutable = readVaruint1(Ptr);
-      Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::GLOBAL_IMPORT);
+      Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::GLOBAL_IMPORT,
+                           Sections.size(), i);
       break;
     default:
       // TODO(sbc): Handle other kinds of imports
       return make_error<GenericBinaryError>(
           "Unexpected import kind", object_error::parse_failed);
     }
     Imports.push_back(Im);
   }
if (Ptr != End)
     return make_error<GenericBinaryError>("Global section ended prematurely",
                                           object_error::parse_failed);
   return Error::success();
 }
 
 Error WasmObjectFile::parseExportSection(const uint8_t *Ptr, const uint8_t *End) {
   uint32_t Count = readVaruint32(Ptr);
   Exports.reserve(Count);
-  while (Count--) {
+  for (uint32_t i = 0; i < Count; i++) {
     wasm::WasmExport Ex;
     Ex.Name = readString(Ptr);
     Ex.Kind = readUint8(Ptr);
     Ex.Index = readVaruint32(Ptr);
     Exports.push_back(Ex);
     switch (Ex.Kind) {
     case wasm::WASM_EXTERNAL_FUNCTION:
-      Symbols.emplace_back(Ex.Name, WasmSymbol::SymbolType::FUNCTION_EXPORT);
+      Symbols.emplace_back(Ex.Name, WasmSymbol::SymbolType::FUNCTION_EXPORT,
+                           Sections.size(), i);
       break;
     case wasm::WASM_EXTERNAL_GLOBAL:
-      Symbols.emplace_back(Ex.Name, WasmSymbol::SymbolType::GLOBAL_EXPORT);
+      Symbols.emplace_back(Ex.Name, WasmSymbol::SymbolType::GLOBAL_EXPORT,
+                           Sections.size(), i);
       break;
     default:
       // TODO(sbc): Handle other kinds of exports
       return make_error<GenericBinaryError>(
           "Unexpected export kind", object_error::parse_failed);
     }
   }
   if (Ptr != End)

 
 const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const {
   return Header;
 }
 
 void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.a++; }
 
 uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const {
+  uint32_t Result = SymbolRef::SF_None;
   const WasmSymbol &Sym = getWasmSymbol(Symb);
+
   switch (Sym.Type) {
   case WasmSymbol::SymbolType::FUNCTION_IMPORT:
-    return object::SymbolRef::SF_Undefined | SymbolRef::SF_Executable;
+    Result |= SymbolRef::SF_Undefined | SymbolRef::SF_Executable;
+    break;
   case WasmSymbol::SymbolType::FUNCTION_EXPORT:
-    return object::SymbolRef::SF_Global | SymbolRef::SF_Executable;
+    Result |= SymbolRef::SF_Global | SymbolRef::SF_Executable;
+    break;
   case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
-    return object::SymbolRef::SF_Executable;
+    Result |= SymbolRef::SF_Executable;
+    break;
   case WasmSymbol::SymbolType::GLOBAL_IMPORT:
-    return object::SymbolRef::SF_Undefined;
+    Result |= SymbolRef::SF_Undefined;
+    break;
   case WasmSymbol::SymbolType::GLOBAL_EXPORT:
-    return object::SymbolRef::SF_Global;
+    Result |= SymbolRef::SF_Global;
+    break;
   }
-  llvm_unreachable("Unknown WasmSymbol::SymbolType");
+
+  return Result;
 }
 
 basic_symbol_iterator WasmObjectFile::symbol_begin() const {
   DataRefImpl Ref;
   Ref.d.a = 0;
   return BasicSymbolRef(Ref, this);
 }
 
 basic_symbol_iterator WasmObjectFile::symbol_end() const {
   DataRefImpl Ref;
   Ref.d.a = Symbols.size();
   return BasicSymbolRef(Ref, this);
 }
 
 const WasmSymbol &WasmObjectFile::getWasmSymbol(DataRefImpl Symb) const {
   return Symbols[Symb.d.a];
 }
 
 Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const {
   const WasmSymbol &Sym = getWasmSymbol(Symb);
   return Sym.Name;
 }
 
 Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const {
-  return (uint64_t)Symb.d.a;
+  return getSymbolValue(Symb);
 }
 
 uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
-  llvm_unreachable("not yet implemented");
-  return 0;
+  const WasmSymbol &Sym = getWasmSymbol(Symb);
+  return Sym.ElementIndex;
 }
 
 uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const {
   llvm_unreachable("not yet implemented");
   return 0;
 }
 
 uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
   llvm_unreachable("not yet implemented");
   return 0;
 }
 
 Expected<SymbolRef::Type>
 WasmObjectFile::getSymbolType(DataRefImpl Symb) const {
-  llvm_unreachable("not yet implemented");
-  return errorCodeToError(object_error::invalid_symbol_index);
+  const WasmSymbol &Sym = getWasmSymbol(Symb);
+
+  switch (Sym.Type) {
+  case WasmSymbol::SymbolType::FUNCTION_IMPORT:
+  case WasmSymbol::SymbolType::FUNCTION_EXPORT:
+  case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
+    return SymbolRef::ST_Function;
+  case WasmSymbol::SymbolType::GLOBAL_IMPORT:
+  case WasmSymbol::SymbolType::GLOBAL_EXPORT:
+    return SymbolRef::ST_Data;
+  }
+
+  llvm_unreachable("Unknown WasmSymbol::SymbolType");
+  return SymbolRef::ST_Other;
 }
 
 Expected<section_iterator>
 WasmObjectFile::getSymbolSection(DataRefImpl Symb) const {
-  llvm_unreachable("not yet implemented");
-  return errorCodeToError(object_error::invalid_symbol_index);
+  DataRefImpl Ref;
+  Ref.d.a = getWasmSymbol(Symb).Section;
+  return section_iterator(SectionRef(Ref, this));
 }
 
 void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; }
 
 std::error_code WasmObjectFile::getSectionName(DataRefImpl Sec,
                                                StringRef &Res) const {
   const WasmSection &S = Sections[Sec.d.a];
 #define ECase(X)                                                               \

test/tools/llvm-objdump/WebAssembly/symbol-table.test

+RUN: llvm-objdump -t %p/../Inputs/test.wasm | FileCheck %s
+
+CHECK: SYMBOL TABLE:
+CHECK: 00000000 l     F IMPORT bar
+CHECK: 00000000 g     F EXPORT baz
+CHECK: 00000001 g     F EXPORT quux
+CHECK: 00000000 l     F name   $import
+CHECK: 00000001 l     F name   $func0