[ELF] Align the value if needed when computing the expression

Also add the test cases for the addition and subtraction both for
the relative and absolute case.

Differential Revision: https://reviews.llvm.org/D35346

llvm-svn: 308692

1 files changed, 4 insertions, 2 deletions

diff --git a/lld/ELF/ScriptParser.cpp b/lld/ELF/ScriptParser.cpp
index 531c61e6cb4..29570c80d2f 100644
--- a/lld/ELF/ScriptParser.cpp
+++ b/lld/ELF/ScriptParser.cpp
@@ -139,11 +139,13 @@ static void moveAbsRight(ExprValue &A, ExprValue &B) {
 
 static ExprValue add(ExprValue A, ExprValue B) {
   moveAbsRight(A, B);
-  return {A.Sec, A.ForceAbsolute, A.Val + B.getValue(), A.Loc};
+  uint64_t Val = alignTo(A.Val, A.Alignment) + B.getValue();
+  return {A.Sec, A.ForceAbsolute, Val, A.Loc};
 }
 
 static ExprValue sub(ExprValue A, ExprValue B) {
-  return {A.Sec, A.Val - B.getValue(), A.Loc};
+  uint64_t Val = alignTo(A.Val, A.Alignment) - B.getValue();
+  return {A.Sec, Val, A.Loc};
 }
 
 static ExprValue mul(ExprValue A, ExprValue B) {