Make the contents of encoded sections SmallVector<char, N> instead of

SmallString. This makes it possible to use the length-erased SmallVectorImpl
in the interface without imposing buffer size. Thus, the size of MCInstFragment
is back down since a preallocated 8-byte contents buffer is enough.

It would be generally a good idea to rid all the fragments of SmallString as
contents, because a vector just makes more sense.

llvm-svn: 169644

2 files changed, 9 insertions, 9 deletions

diff --git a/llvm/lib/MC/ELFObjectWriter.cpp b/llvm/lib/MC/ELFObjectWriter.cpp
index b0623d35a9e..bfe17094628 100644
--- a/llvm/lib/MC/ELFObjectWriter.cpp
+++ b/llvm/lib/MC/ELFObjectWriter.cpp
@@ -203,7 +203,7 @@ class ELFObjectWriter : public MCObjectWriter {
     void String8(MCDataFragment &F, uint8_t Value) {
       char buf[1];
       buf[0] = Value;
-      F.getContents() += StringRef(buf, 1);
+      F.getContents().append(&buf[0], &buf[1]);
     }
 
     void String16(MCDataFragment &F, uint16_t Value) {
@@ -212,7 +212,7 @@ class ELFObjectWriter : public MCObjectWriter {
         StringLE16(buf, Value);
       else
         StringBE16(buf, Value);
-      F.getContents() += StringRef(buf, 2);
+      F.getContents().append(&buf[0], &buf[2]);
     }
 
     void String32(MCDataFragment &F, uint32_t Value) {
@@ -221,7 +221,7 @@ class ELFObjectWriter : public MCObjectWriter {
         StringLE32(buf, Value);
       else
         StringBE32(buf, Value);
-      F.getContents() += StringRef(buf, 4);
+      F.getContents().append(&buf[0], &buf[4]);
     }
 
     void String64(MCDataFragment &F, uint64_t Value) {
@@ -230,7 +230,7 @@ class ELFObjectWriter : public MCObjectWriter {
         StringLE64(buf, Value);
       else
         StringBE64(buf, Value);
-      F.getContents() += StringRef(buf, 8);
+      F.getContents().append(&buf[0], &buf[8]);
     }
 
     void WriteHeader(uint64_t SectionDataSize,
@@ -1186,7 +1186,7 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
   // The first entry of a string table holds a null character so skip
   // section 0.
   uint64_t Index = 1;
-  F->getContents() += '\x00';
+  F->getContents().push_back('\x00');
 
   for (unsigned int I = 0, E = Sections.size(); I != E; ++I) {
     const MCSectionELF &Section = *Sections[I];
@@ -1204,8 +1204,8 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
     SectionStringTableIndex[&Section] = Index;
 
     Index += Name.size() + 1;
-    F->getContents() += Name;
-    F->getContents() += '\x00';
+    F->getContents().append(Name.begin(), Name.end());
+    F->getContents().push_back('\x00');
   }
 }
 
@@ -1380,7 +1380,7 @@ void ELFObjectWriter::WriteDataSectionData(MCAssembler &Asm,
          ++i) {
       const MCFragment &F = *i;
       assert(F.getKind() == MCFragment::FT_Data);
-      WriteBytes(cast<MCDataFragment>(F).getContents().str());
+      WriteBytes(cast<MCDataFragment>(F).getContents());
     }
   } else {
     Asm.writeSectionData(&SD, Layout);
diff --git a/llvm/lib/MC/MCAssembler.cpp b/llvm/lib/MC/MCAssembler.cpp
index b2136e553e2..989d8be0af5 100644
--- a/llvm/lib/MC/MCAssembler.cpp
+++ b/llvm/lib/MC/MCAssembler.cpp
@@ -391,7 +391,7 @@ void MCAsmLayout::LayoutFragment(MCFragment *F) {
 ///        a MCEncodedFragment.
 static void writeFragmentContents(const MCFragment &F, MCObjectWriter *OW) {
   MCEncodedFragment &EF = cast<MCEncodedFragment>(F);
-  OW->WriteBytes(EF.getContents().str());
+  OW->WriteBytes(EF.getContents());
 }
 
 /// \brief Write the fragment \p F to the output file.