[ELF] - Implemented linkerscript ALIGN command

ALIGN(exp)
Return the location counter (.) aligned to the next exp boundary. (https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/4/html/Using_ld_the_GNU_Linker/expressions.html)

Patch implements this command.
This fixes PR27406.

Differential revision: http://reviews.llvm.org/D19364

llvm-svn: 267145

1 files changed, 8 insertions, 0 deletions

diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index 77ba023b049..1cfe358c857 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -94,6 +94,14 @@ uint64_t LinkerScript<ELFT>::parsePrimary(ArrayRef<StringRef> &Tokens) {
       return 0;
     return V;
   }
+  if (Tok == "ALIGN") {
+    if (!expect(Tokens, "("))
+      return 0;
+    uint64_t V = parseExpr(Tokens);
+    if (!expect(Tokens, ")"))
+      return 0;
+    return alignTo(Dot, V);
+  }
   return getInteger(Tok);
 }