From 036ec43e830d75c763a5edbd61fa31752adcfd11 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Wed, 4 Nov 2015 23:50:29 +0000
Subject: [PATCH] Simplify .org processing and make it a bit more powerful.

We now always create the fragment, which lets us handle things like .org after
a .align.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252101 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/MC/MCAssembler.cpp                      | 11 +++++++++--
 lib/MC/MCObjectStreamer.cpp                 | 18 +-----------------
 test/MC/AsmParser/dot-symbol-non-absolute.s |  2 +-
 test/MC/ELF/dot-symbol-assignment.s         |  5 ++++-
 4 files changed, 15 insertions(+), 21 deletions(-)

diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index 971dc526ea6..06f65fcb49a 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -533,12 +533,19 @@ uint64_t MCAssembler::computeFragmentSize(const MCAsmLayout &Layout,
 
   case MCFragment::FT_Org: {
     const MCOrgFragment &OF = cast<MCOrgFragment>(F);
-    int64_t TargetLocation;
-    if (!OF.getOffset().evaluateAsAbsolute(TargetLocation, Layout))
+    MCValue Value;
+    if (!OF.getOffset().evaluateAsValue(Value, Layout))
       report_fatal_error("expected assembly-time absolute expression");
 
     // FIXME: We need a way to communicate this error.
     uint64_t FragmentOffset = Layout.getFragmentOffset(&OF);
+    int64_t TargetLocation = Value.getConstant();
+    if (const MCSymbolRefExpr *A = Value.getSymA()) {
+      uint64_t Val;
+      if (!Layout.getSymbolOffset(A->getSymbol(), Val))
+        report_fatal_error("expected absolute expression");
+      TargetLocation += Val;
+    }
     int64_t Size = TargetLocation - FragmentOffset;
     if (Size < 0 || Size >= 0x40000000)
       report_fatal_error("invalid .org offset '" + Twine(TargetLocation) +
diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index 0da61b5ddce..667384e76ca 100644
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -393,23 +393,7 @@ void MCObjectStreamer::EmitCodeAlignment(unsigned ByteAlignment,
 
 bool MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
                                          unsigned char Value) {
-  int64_t Res;
-  if (Offset->evaluateAsAbsolute(Res, getAssembler())) {
-    insert(new MCOrgFragment(*Offset, Value));
-    return false;
-  }
-
-  MCSymbol *CurrentPos = getContext().createTempSymbol();
-  EmitLabel(CurrentPos);
-  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
-  const MCExpr *Ref =
-    MCSymbolRefExpr::create(CurrentPos, Variant, getContext());
-  const MCExpr *Delta =
-    MCBinaryExpr::create(MCBinaryExpr::Sub, Offset, Ref, getContext());
-
-  if (!Delta->evaluateAsAbsolute(Res, getAssembler()))
-    return true;
-  EmitFill(Res, Value);
+  insert(new MCOrgFragment(*Offset, Value));
   return false;
 }
 
diff --git a/test/MC/AsmParser/dot-symbol-non-absolute.s b/test/MC/AsmParser/dot-symbol-non-absolute.s
index 7342365fe1b..7cc97f9ed2b 100644
--- a/test/MC/AsmParser/dot-symbol-non-absolute.s
+++ b/test/MC/AsmParser/dot-symbol-non-absolute.s
@@ -4,6 +4,6 @@
 
 	.extern foo
 
-# CHECK: error: expected absolute expression
+# CHECK: : expected absolute expression
 . = foo + 10
 	.byte 1
diff --git a/test/MC/ELF/dot-symbol-assignment.s b/test/MC/ELF/dot-symbol-assignment.s
index 00fe205082b..284bef0f337 100644
--- a/test/MC/ELF/dot-symbol-assignment.s
+++ b/test/MC/ELF/dot-symbol-assignment.s
@@ -11,6 +11,9 @@ two:
 three:
 	.quad 0xdddddddddddddddd
 
+        .align 4
+        . = three + 9
+
 // CHECK:        Section {
 // CHECK:          Name: .text
 // CHECK-NEXT:     Type:
@@ -18,5 +21,5 @@ three:
 // CHECK:          SectionData (
 // CHECK-NEXT:     0000: FFFFFFFF FFFFFFFF 00000000 00000000
 // CHECK-NEXT:     0010: 00000000 00000000 EEEEEEEE EEEEEEEE
-// CHECK-NEXT:     0020: DDDDDDDD DDDDDDDD
+// CHECK-NEXT:     0020: DDDDDDDD DDDDDDDD 00 |
 // CHECK-NEXT:     )
-- 
2.34.1