ELF: Rename RandomizePaddingSection to PaddingSection.

This section type is about to be used by llvm#147424 so let's give it a more
generic name.

Reviewers: smithp35, MaskRay

Reviewed By: MaskRay

Pull Request: llvm#155540

Author: pcc

lld/ELF/SyntheticSections.cpp

@@ -2749,14 +2749,13 @@ RelroPaddingSection::RelroPaddingSection(Ctx &ctx)
     : SyntheticSection(ctx, ".relro_padding", SHT_NOBITS, SHF_ALLOC | SHF_WRITE,
                        1) {}
 
-RandomizePaddingSection::RandomizePaddingSection(Ctx &ctx, uint64_t size,
-                                                 OutputSection *parent)
-    : SyntheticSection(ctx, ".randomize_padding", SHT_PROGBITS, SHF_ALLOC, 1),
+PaddingSection::PaddingSection(Ctx &ctx, uint64_t size, OutputSection *parent)
+    : SyntheticSection(ctx, ".padding", SHT_PROGBITS, SHF_ALLOC, 1),
       size(size) {
   this->parent = parent;
 }
 
-void RandomizePaddingSection::writeTo(uint8_t *buf) {
+void PaddingSection::writeTo(uint8_t *buf) {
   std::array<uint8_t, 4> filler = getParent()->getFiller(ctx);
   uint8_t *end = buf + size;
   for (; buf + 4 <= end; buf += 4)

lld/ELF/SyntheticSections.h

@@ -779,11 +779,11 @@ class RelroPaddingSection final : public SyntheticSection {
   void writeTo(uint8_t *buf) override {}
 };
 
-class RandomizePaddingSection final : public SyntheticSection {
+class PaddingSection final : public SyntheticSection {
   uint64_t size;
 
 public:
-  RandomizePaddingSection(Ctx &ctx, uint64_t size, OutputSection *parent);
+  PaddingSection(Ctx &ctx, uint64_t size, OutputSection *parent);
   size_t getSize() const override { return size; }
   void writeTo(uint8_t *buf) override;
 };

lld/ELF/Writer.cpp

@@ -1495,15 +1495,14 @@ static void randomizeSectionPadding(Ctx &ctx) {
       if (auto *isd = dyn_cast<InputSectionDescription>(bc)) {
         SmallVector<InputSection *, 0> tmp;
         if (os->ptLoad != curPtLoad) {
-          tmp.push_back(make<RandomizePaddingSection>(
-              ctx, g() % ctx.arg.maxPageSize, os));
+          tmp.push_back(
+              make<PaddingSection>(ctx, g() % ctx.arg.maxPageSize, os));
           curPtLoad = os->ptLoad;
         }
         for (InputSection *isec : isd->sections) {
           // Probability of inserting padding is 1 in 16.
           if (g() % 16 == 0)
-            tmp.push_back(
-                make<RandomizePaddingSection>(ctx, isec->addralign, os));
+            tmp.push_back(make<PaddingSection>(ctx, isec->addralign, os));
           tmp.push_back(isec);
         }
         isd->sections = std::move(tmp);