Add parsing of 'foo@local".

[jhibbits]

Summary

Currently, it supports generating, but not parsing, this expression.
Test added as well.

[hfinkel]

LGTM.

[grosbach]

Do you want the upper-case variant as well? i.e., foo@LOCAL? That would match the other entries in the switch.

[jhibbits]

In D6672#102521, @grosbach wrote:

Do you want the upper-case variant as well? i.e., foo@LOCAL? That would match the other entries in the switch.

Good eye. I had made the change for another local branch, but didn't add it to this apparently. I'll go ahead and add it.

llvm/trunk/lib/MC/MCExpr.cpp

return StringSwitch<VariantKind>(Name)
     .Case("HIGHESTA", VK_PPC_HIGHESTA)
     .Case("highesta", VK_PPC_HIGHESTA)
     .Case("GOT@L", VK_PPC_GOT_LO)
     .Case("got@l", VK_PPC_GOT_LO)
     .Case("GOT@H", VK_PPC_GOT_HI)
     .Case("got@h", VK_PPC_GOT_HI)
     .Case("GOT@HA", VK_PPC_GOT_HA)
     .Case("got@ha", VK_PPC_GOT_HA)
+    .Case("local", VK_PPC_LOCAL)
     .Case("TOCBASE", VK_PPC_TOCBASE)
     .Case("tocbase", VK_PPC_TOCBASE)
     .Case("TOC", VK_PPC_TOC)
     .Case("toc", VK_PPC_TOC)
     .Case("TOC@L", VK_PPC_TOC_LO)
     .Case("toc@l", VK_PPC_TOC_LO)
     .Case("TOC@H", VK_PPC_TOC_HI)
     .Case("toc@h", VK_PPC_TOC_HI)

llvm/trunk/test/MC/PowerPC/ppc-reloc.s

 # RUN: llvm-mc -triple=powerpc-unknown-linux-gnu -filetype=obj %s | \
 # RUN: llvm-readobj -r | FileCheck %s
   .section .text
 
   .globl foo
   .type foo,@function
   .align 2
 foo:
   bl printf@plt
+  bl _GLOBAL_OFFSET_TABLE_@local-4
 .LC1:
   .size foo, . - foo
 
 # CHECK:      Relocations [
 # CHECK-NEXT:   Section (2) .rela.text {
 # CHECK-NEXT:     0x0 R_PPC_PLTREL24 printf 0x0
+# CHECK-NEXT:     0x4 R_PPC_LOCAL24PC _GLOBAL_OFFSET_TABLE_ 0xFFFFFFFC
 # CHECK-NEXT:   }
 # CHECK-NEXT: ]