[PATCH] D19237: ELF: Add +, -, *, / and & to SECTIONS linker script command.

[Rui Ueyama via llvm-commits]

ruiu created this revision.
ruiu added a reviewer: grimar.
ruiu added a subscriber: llvm-commits.

This patch is based heavily on George Rimor's patch
http://reviews.llvm.org/D19221.

In the linker script, you can write expressions to compute addresses.
Currently we only support "+" operator. This adds a few more operators.

Since this patch adds * and /, we need to handle operator precedences
properly. I implemented that using the operator-precedence grammar.

http://reviews.llvm.org/D19237

Files:
  ELF/LinkerScript.cpp
  ELF/LinkerScript.h
  test/ELF/linkerscript-locationcounter.s

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