Add support for reading files with more than 0xff00 sections.

llvm-svn: 245880

lld/ELF/InputFiles.cpp

@@ -46,6 +46,12 @@ template <class ELFT> void elf2::ObjectFile<ELFT>::initializeChunks() {
     case SHT_SYMTAB:
       Symtab = &Sec;
       break;
+    case SHT_SYMTAB_SHNDX: {
+      ErrorOr<ArrayRef<Elf_Word>> ErrorOrTable = ELFObj->getSHNDXTable(Sec);
+      error(ErrorOrTable);
+      SymtabSHNDX = *ErrorOrTable;
+      break;
+    }
     case SHT_STRTAB:
     case SHT_NULL:
     case SHT_RELA:
@@ -82,7 +88,11 @@ SymbolBody *elf2::ObjectFile<ELFT>::createSymbolBody(StringRef StringTable,
   ErrorOr<StringRef> NameOrErr = Sym->getName(StringTable);
   error(NameOrErr.getError());
   StringRef Name = *NameOrErr;
-  uint16_t SecIndex = Sym->st_shndx;
+
+  uint32_t SecIndex = Sym->st_shndx;
+  if (SecIndex == SHN_XINDEX)
+    SecIndex = ELFObj->getExtendedSymbolTableIndex(Sym, Symtab, SymtabSHNDX);
+
   switch (Sym->getBinding()) {
   default:
     error("unexpected binding");

lld/ELF/InputFiles.h

@@ -65,6 +65,7 @@ template <class ELFT> class ObjectFile : public ObjectFileBase {
   typedef typename llvm::object::ELFFile<ELFT>::Elf_Sym Elf_Sym;
   typedef typename llvm::object::ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
   typedef typename llvm::object::ELFFile<ELFT>::Elf_Sym_Range Elf_Sym_Range;
+  typedef typename llvm::object::ELFFile<ELFT>::Elf_Word Elf_Word;
 
 public:
   bool isCompatibleWith(const ObjectFileBase &Other) const override;
@@ -102,6 +103,7 @@ private:
   std::vector<SectionChunk<ELFT> *> Chunks;
 
   const Elf_Shdr *Symtab = nullptr;
+  ArrayRef<Elf_Word> SymtabSHNDX;
 };
 
 } // namespace elf2

lld/test/elf2/many-sections.s

@@ -0,0 +1,113 @@
+// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o %t
+// RUN: llvm-readobj -t %t | FileCheck --check-prefix=LINKED %s
+
+// Verify that the symbol _start is in a section with an index >= SHN_LORESERVE.
+// CHECK:      Name: _start
+// CHECK-NEXT: Value: 0x0
+// CHECK-NEXT: Size: 0
+// CHECK-NEXT: Binding: Global
+// CHECK-NEXT: Type: None
+// CHECK-NEXT: Other: 0
+// CHECK-NEXT: Section: dm (0xFF00)
+
+
+// RUN: lld -flavor gnu2 %t -o %t2
+// RUN: llvm-readobj -t %t2 | FileCheck --check-prefix=LINKED %s
+
+// Test that _start is in the correct section.
+// LINKED:      Name: _start
+// LINKED-NEXT: Value: 0x0
+// LINKED-NEXT: Size: 0
+// LINKED-NEXT: Binding: Global
+// LINKED-NEXT: Type: None
+// LINKED-NEXT: Other: 0
+// LINKED-NEXT: Section: dm
+
+.macro gen_sections4 x
+        .section a\x
+        .section b\x
+        .section c\x
+        .section d\x
+.endm
+
+.macro gen_sections8 x
+        gen_sections4 a\x
+        gen_sections4 b\x
+.endm
+
+.macro gen_sections16 x
+        gen_sections8 a\x
+        gen_sections8 b\x
+.endm
+
+.macro gen_sections32 x
+        gen_sections16 a\x
+        gen_sections16 b\x
+.endm
+
+.macro gen_sections64 x
+        gen_sections32 a\x
+        gen_sections32 b\x
+.endm
+
+.macro gen_sections128 x
+        gen_sections64 a\x
+        gen_sections64 b\x
+.endm
+
+.macro gen_sections256 x
+        gen_sections128 a\x
+        gen_sections128 b\x
+.endm
+
+.macro gen_sections512 x
+        gen_sections256 a\x
+        gen_sections256 b\x
+.endm
+
+.macro gen_sections1024 x
+        gen_sections512 a\x
+        gen_sections512 b\x
+.endm
+
+.macro gen_sections2048 x
+        gen_sections1024 a\x
+        gen_sections1024 b\x
+.endm
+
+.macro gen_sections4096 x
+        gen_sections2048 a\x
+        gen_sections2048 b\x
+.endm
+
+.macro gen_sections8192 x
+        gen_sections4096 a\x
+        gen_sections4096 b\x
+.endm
+
+.macro gen_sections16384 x
+        gen_sections8192 a\x
+        gen_sections8192 b\x
+.endm
+
+.macro gen_sections32768 x
+        gen_sections16384 a\x
+        gen_sections16384 b\x
+.endm
+
+gen_sections32768 a
+gen_sections16384 b
+gen_sections8192 c
+gen_sections4096 d
+gen_sections2048 e
+gen_sections1024 f
+gen_sections512 g
+gen_sections128 h
+gen_sections64 i
+gen_sections32 j
+gen_sections16 k
+gen_sections8 l
+gen_sections4 m
+
+.global _start
+_start: