[MC] Pass the symbol rather than its name to onSymbolStart()

Summary: This allows targets to also consider the symbol's type and/or address if needed.

Reviewers: scott.linder, jhenderson, MaskRay, aardappel

Reviewed By: scott.linder, MaskRay

Subscribers: dschuff, sbc100, jgravelle-google, hiraditya, aheejin, rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D82090

llvm/include/llvm/MC/MCDisassembler/MCDisassembler.h

@@ -135,7 +135,7 @@ public:
   /// Base implementation returns None. So all targets by default ignore to
   /// treat symbols separately.
   ///
-  /// \param Name     - The name of the symbol.
+  /// \param Symbol   - The symbol.
   /// \param Size     - The number of bytes consumed.
   /// \param Address  - The address, in the memory space of region, of the first
   ///                   byte of the symbol.
@@ -150,10 +150,9 @@ public:
   ///                   done by buffering the output if needed.
   ///                 - None if the target doesn't want to handle the symbol
   ///                   separately. Value of Size is ignored in this case.
-  virtual Optional<DecodeStatus> onSymbolStart(StringRef Name, uint64_t &Size,
-                                               ArrayRef<uint8_t> Bytes,
-                                               uint64_t Address,
-                                               raw_ostream &CStream) const;
+  virtual Optional<DecodeStatus>
+  onSymbolStart(SymbolInfoTy &Symbol, uint64_t &Size, ArrayRef<uint8_t> Bytes,
+                uint64_t Address, raw_ostream &CStream) const;
   // TODO:
   // Implement similar hooks that can be used at other points during
   // disassembly. Something along the following lines:

llvm/lib/MC/MCDisassembler/MCDisassembler.cpp

@@ -17,7 +17,7 @@ using namespace llvm;
 MCDisassembler::~MCDisassembler() = default;
 
 Optional<MCDisassembler::DecodeStatus>
-MCDisassembler::onSymbolStart(StringRef Name, uint64_t &Size,
+MCDisassembler::onSymbolStart(SymbolInfoTy &Symbol, uint64_t &Size,
                               ArrayRef<uint8_t> Bytes, uint64_t Address,
                               raw_ostream &CStream) const {
   return None;

llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp

@@ -46,7 +46,7 @@ class WebAssemblyDisassembler final : public MCDisassembler {
   DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
                               ArrayRef<uint8_t> Bytes, uint64_t Address,
                               raw_ostream &CStream) const override;
-  Optional<DecodeStatus> onSymbolStart(StringRef Name, uint64_t &Size,
+  Optional<DecodeStatus> onSymbolStart(SymbolInfoTy &Symbol, uint64_t &Size,
                                        ArrayRef<uint8_t> Bytes,
                                        uint64_t Address,
                                        raw_ostream &CStream) const override;
@@ -122,8 +122,8 @@ bool parseImmediate(MCInst &MI, uint64_t &Size, ArrayRef<uint8_t> Bytes) {
 }
 
 Optional<MCDisassembler::DecodeStatus> WebAssemblyDisassembler::onSymbolStart(
-    StringRef Name, uint64_t &Size, ArrayRef<uint8_t> Bytes, uint64_t Address,
-    raw_ostream &CStream) const {
+    SymbolInfoTy &Symbol, uint64_t &Size, ArrayRef<uint8_t> Bytes,
+    uint64_t Address, raw_ostream &CStream) const {
   Size = 0;
   if (Address == 0) {
     // Start of a code section: we're parsing only the function count.

llvm/tools/llvm-objdump/llvm-objdump.cpp

@@ -1429,7 +1429,7 @@ static void disassembleObject(const Target *TheTarget, const ObjectFile *Obj,
         continue;
       }
 
-      auto Status = DisAsm->onSymbolStart(SymbolName, Size,
+      auto Status = DisAsm->onSymbolStart(Symbols[SI], Size,
                                           Bytes.slice(Start, End - Start),
                                           SectionAddr + Start, CommentStream);
       // To have round trippable disassembly, we fall back to decoding the