[llvm-objcopy] Replace the size() helper with SectionTableRef::size

Summary:
BTW, STLExtras.h provides llvm::size() which is similar to std::size()
for random access iterators. However, if we prefer qualified
llvm::size(), the member function .size() will be more convenient.

Reviewers: jhenderson, jakehehrlich, rupprecht, grimar, alexshap, espindola

Reviewed By: grimar

Subscribers: emaste, arichardson, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60028

llvm-svn: 357347

Author: MaskRay

llvm/tools/llvm-objcopy/ELF/Object.cpp

@@ -1221,11 +1221,6 @@ template <class ELFT> void ELFBuilder<ELFT>::build() {
               " in elf header " + " is not a string table");
 }
 
-// A generic size function which computes sizes of any random access range.
-template <class R> size_t size(R &&Range) {
-  return static_cast<size_t>(std::end(Range) - std::begin(Range));
-}
-
 Writer::~Writer() {}
 
 Reader::~Reader() {}
@@ -1282,7 +1277,7 @@ template <class ELFT> void ELFWriter<ELFT>::writeEhdr() {
   Ehdr.e_phentsize = (Ehdr.e_phnum != 0) ? sizeof(Elf_Phdr) : 0;
   Ehdr.e_flags = Obj.Flags;
   Ehdr.e_ehsize = sizeof(Elf_Ehdr);
-  if (WriteSectionHeaders && size(Obj.sections()) != 0) {
+  if (WriteSectionHeaders && Obj.sections().size() != 0) {
     Ehdr.e_shentsize = sizeof(Elf_Shdr);
     Ehdr.e_shoff = Obj.SHOffset;
     // """
@@ -1291,7 +1286,7 @@ template <class ELFT> void ELFWriter<ELFT>::writeEhdr() {
     // number of section header table entries is contained in the sh_size field
     // of the section header at index 0.
     // """
-    auto Shnum = size(Obj.sections()) + 1;
+    auto Shnum = Obj.sections().size() + 1;
     if (Shnum >= SHN_LORESERVE)
       Ehdr.e_shnum = 0;
     else
@@ -1330,7 +1325,7 @@ template <class ELFT> void ELFWriter<ELFT>::writeShdrs() {
   Shdr.sh_addr = 0;
   Shdr.sh_offset = 0;
   // See writeEhdr for why we do this.
-  uint64_t Shnum = size(Obj.sections()) + 1;
+  uint64_t Shnum = Obj.sections().size() + 1;
   if (Shnum >= SHN_LORESERVE)
     Shdr.sh_size = Shnum;
   else
@@ -1564,7 +1559,7 @@ template <class ELFT> size_t ELFWriter<ELFT>::totalSize() const {
   // We already have the section header offset so we can calculate the total
   // size by just adding up the size of each section header.
   auto NullSectionSize = WriteSectionHeaders ? sizeof(Elf_Shdr) : 0;
-  return Obj.SHOffset + size(Obj.sections()) * sizeof(Elf_Shdr) +
+  return Obj.SHOffset + Obj.sections().size() * sizeof(Elf_Shdr) +
          NullSectionSize;
 }
 
@@ -1595,7 +1590,7 @@ template <class ELFT> Error ELFWriter<ELFT>::finalize() {
   // if we need large indexes or not. We can assign indexes first and check as
   // we go to see if we will actully need large indexes.
   bool NeedsLargeIndexes = false;
-  if (size(Obj.sections()) >= SHN_LORESERVE) {
+  if (Obj.sections().size() >= SHN_LORESERVE) {
     auto Sections = Obj.sections();
     NeedsLargeIndexes =
         std::any_of(Sections.begin() + SHN_LORESERVE, Sections.end(),

llvm/tools/llvm-objcopy/ELF/Object.h

@@ -59,6 +59,7 @@ class SectionTableRef {
 
   iterator begin() { return iterator(Sections.data()); }
   iterator end() { return iterator(Sections.data() + Sections.size()); }
+  size_t size() const { return Sections.size(); }
 
   SectionBase *getSection(uint32_t Index, Twine ErrMsg);