[Mips] Fix clang integrated assembler generates incorrect relocations for mips32

When mips asm parse instruction la, check whether .rdata section
was accessed and parsed, if it was not, then check the following
statement, check if local symbol(eg "hello:") was in .rdata
section, if it was in it, IsLocalSym is true.

Fix #65020

Author: yingopq

llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp

@@ -149,6 +149,7 @@ class MipsAsmParser : public MCTargetAsmParser {
                        // directive.
   bool IsLittleEndian;
   bool IsPicEnabled;
+  bool HasParseRdata;
   bool IsCpRestoreSet;
   int CpRestoreOffset;
   unsigned GPReg;
@@ -555,6 +556,7 @@ class MipsAsmParser : public MCTargetAsmParser {
     IsPicEnabled = getContext().getObjectFileInfo()->isPositionIndependent();
 
     IsCpRestoreSet = false;
+    HasParseRdata = false;
     CpRestoreOffset = -1;
     GPReg = ABI.GetGlobalPtr();
 
@@ -2920,11 +2922,45 @@ bool MipsAsmParser::loadAndAddSymbolAddress(const MCExpr *SymExpr,
         (Res.getSymA()->getSymbol().isELF() &&
          cast<MCSymbolELF>(Res.getSymA()->getSymbol()).getBinding() ==
              ELF::STB_LOCAL);
+
     // For O32, "$"-prefixed symbols are recognized as temporary while
     // .L-prefixed symbols are not (PrivateGlobalPrefix is "$"). Recognize ".L"
     // manually.
     if (ABI.IsO32() && Res.getSymA()->getSymbol().getName().starts_with(".L"))
       IsLocalSym = true;
+    else {
+      if (HasParseRdata == false) {
+        StringRef CurrentASMContent = StringRef(IDLoc.getPointer());
+
+        // Get local symbol name LocalSymbol from "la $number, localsymbolname\n
+        // ... "
+        size_t NewlineIndex = CurrentASMContent.find_first_of('\n');
+        size_t CommaIndex = CurrentASMContent.find_first_of(',');
+        size_t SymbolLength = NewlineIndex - CommaIndex - 2;
+        StringRef LocalSymbol =
+            CurrentASMContent.take_front(NewlineIndex).take_back(SymbolLength);
+
+        // Get and check if ".rdata" section exist.
+        size_t RdataIndex = CurrentASMContent.find(".rdata");
+        if (RdataIndex != StringRef::npos) {
+          StringRef Rdata = CurrentASMContent.substr(RdataIndex);
+
+          // Check if rdata section contain local symbol.
+          if (1 == Rdata.contains(LocalSymbol)) {
+            // Check if "LocalSymbol:" exist.
+            size_t A = Rdata.find(LocalSymbol);
+            size_t B = Rdata.find(':', A);
+            if (B - A == LocalSymbol.size()) {
+              IsLocalSym = true;
+              LLVM_DEBUG(dbgs()
+                         << DEBUG_TYPE << ": Has definition of local symbol "
+                         << LocalSymbol << " after 'la' instruction"
+                         << "\n");
+            }
+          }
+        }
+      }
+    }
     bool UseXGOT = STI->hasFeature(Mips::FeatureXGOT) && !IsLocalSym;
 
     // The case where the result register is $25 is somewhat special. If the
@@ -8073,6 +8109,7 @@ bool MipsAsmParser::parseDirectiveTpRelWord() {
   if (getLexer().isNot(AsmToken::EndOfStatement))
     return Error(getLexer().getLoc(),
                 "unexpected token, expected end of statement");
+  HasParseRdata = true;
   Parser.Lex(); // Eat EndOfStatement token.
   return false;
 }