[llvm] r231295 - Expand variables when evaluating absolute expressions.

[Rafael Espindola]

Author: rafael
Date: Wed Mar  4 16:03:21 2015
New Revision: 231295

URL: http://llvm.org/viewvc/llvm-project?rev=231295&view=rev
Log:
Expand variables when evaluating absolute expressions.

This allows for variables to be used in .size.
This matches gnu AS functionality.

Added:
    llvm/trunk/test/MC/ELF/size.s
Modified:
    llvm/trunk/lib/MC/MCExpr.cpp

Modified: llvm/trunk/lib/MC/MCExpr.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCExpr.cpp?rev=231295&r1=231294&r2=231295&view=diff
==============================================================================
--- llvm/trunk/lib/MC/MCExpr.cpp (original)
+++ llvm/trunk/lib/MC/MCExpr.cpp Wed Mar  4 16:03:21 2015
@@ -436,7 +436,7 @@ bool MCExpr::evaluateAsAbsolute(int64_t
   }
 
   bool IsRelocatable = EvaluateAsRelocatableImpl(
-      Value, Asm, Layout, nullptr, Addrs, InSet, /*ForceVarExpansion*/ false);
+      Value, Asm, Layout, nullptr, Addrs, InSet, /*ForceVarExpansion*/ true);
 
   // Record the current value.
   Res = Value.getConstant();

Added: llvm/trunk/test/MC/ELF/size.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/ELF/size.s?rev=231295&view=auto
==============================================================================
--- llvm/trunk/test/MC/ELF/size.s (added)
+++ llvm/trunk/test/MC/ELF/size.s Wed Mar  4 16:03:21 2015
@@ -0,0 +1,15 @@
+// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux < %s | llvm-readobj -t | FileCheck %s
+
+foo:
+bar = .
+	.size	foo, . - bar + 42
+
+// CHECK:       Symbol {
+// CHECK:         Name: foo
+// CHECK-NEXT:    Value: 0x0
+// CHECK-NEXT:    Size: 42
+// CHECK-NEXT:    Binding: Local
+// CHECK-NEXT:    Type: None
+// CHECK-NEXT:    Other: 0
+// CHECK-NEXT:    Section: .text
+// CHECK-NEXT:  }