[PATCH] D23768: [ELF] Linkerscript: eliminate LayoutInputSection

[Eugene Leviant via llvm-commits]

evgeny777 created this revision.
evgeny777 added a reviewer: ruiu.
evgeny777 added subscribers: grimar, ikudrin, llvm-commits.
evgeny777 set the repository for this revision to rL LLVM.
evgeny777 added a project: lld.

Current implementation of LayoutInputSection relies on LLVM-style casting to InputSection<ELFT>, which is not a base class for it. The following statements will be successfully compiled and executed:

```
InputSection<ELFT> *I = ...;
LayoutInputSection<ELFT> *L = cast<LayoutInputSection<ELFT>>(I);
```

And the following one cannot compile:

```
LayoutInputSection<ELFT> *L = static_cast<LayoutInputSection<ELFT> *>(I);
```

This patch eliminates LayoutInputSection by saving pointer to preceding input section in SymbolAssignment class.

Repository:
  rL LLVM

https://reviews.llvm.org/D23768

Files:
  ELF/InputSection.cpp
  ELF/InputSection.h
  ELF/LinkerScript.cpp
  ELF/LinkerScript.h
  ELF/OutputSections.cpp

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