[mips][ias] Make section sizes a multiple of the alignment.

Reviewers: sdardis

Subscribers: dsanders, llvm-commits, sdardis

Differential Revision: http://reviews.llvm.org/D19008

llvm-svn: 268036

llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp

@@ -518,6 +518,21 @@ void MipsTargetELFStreamer::finish() {
   DataSection.setAlignment(std::max(16u, DataSection.getAlignment()));
   BSSSection.setAlignment(std::max(16u, BSSSection.getAlignment()));
 
+  // Make sections sizes a multiple of the alignment.
+  MCStreamer &OS = getStreamer();
+  for (MCSection &S : MCA) {
+    MCSectionELF &Section = static_cast<MCSectionELF &>(S);
+
+    unsigned Alignment = Section.getAlignment();
+    if (Alignment) {
+      OS.SwitchSection(&Section);
+      if (Section.UseCodeAlign())
+        OS.EmitCodeAlignment(Alignment, Alignment);
+      else
+        OS.EmitValueToAlignment(Alignment, 0, 1, Alignment);
+    }
+  }
+
   const FeatureBitset &Features = STI.getFeatureBits();
 
   // Update e_header flags. See the FIXME and comment above in

llvm/test/DebugInfo/Mips/delay-slot.ll

@@ -19,7 +19,7 @@
 ; CHECK: 0x000000000000002c      3      0      1   0             0  is_stmt
 ; CHECK: 0x000000000000003c      4      0      1   0             0  is_stmt
 ; CHECK: 0x0000000000000048      5      0      1   0             0  is_stmt
-; CHECK: 0x0000000000000058      5      0      1   0             0  is_stmt end_sequence
+; CHECK: 0x0000000000000060      5      0      1   0             0  is_stmt end_sequence
 
 
 target datalayout = "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"

llvm/test/MC/Mips/section-size.s

@@ -0,0 +1,106 @@
+# RUN: llvm-mc -triple mips-unknown-linux -filetype=obj %s | \
+# RUN:     llvm-readobj -sections | FileCheck %s
+	.section ".talign1", "ax"
+	.p2align 4
+t1:	.byte 1
+
+	.section ".talign2", "ax"
+	.p2align 3
+t2:	addiu $2, $2, 1
+	addiu $2, $2, 1
+
+	.section ".talign3", "ax"
+	.p2align 3
+t3:	addiu $2, $2, 1
+
+	.section ".talign4", "ax"
+t4:	.byte 1
+
+	.section ".dalign1", "a"
+	.p2align 4
+d1:	.byte 1
+
+	.section ".dalign2", "a"
+	.p2align 3
+d2:	.word 1
+        .word 2
+
+	.section ".dalign3", "a"
+	.p2align 3
+d3:	.word 1
+
+	.section ".dalign4", "a"
+d4:	.byte 1
+
+	.section ".dalign5", "a"
+	.p2align 16
+d5:	.word 1
+
+	.section ".nalign1", ""
+	.p2align 4
+n1:	.byte 1
+
+	.section ".nalign2", ""
+	.p2align 3
+n2:	.word 1
+        .word 2
+
+	.section ".nalign3", ""
+	.p2align 3
+n3:	.word 1
+
+	.section ".nalign4", ""
+n4:	.byte 1
+
+# CHECK-LABEL:   Name: .talign1
+# CHECK:         Size: 16
+# CHECK:         AddressAlignment: 16
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .talign2
+# CHECK:         Size: 8
+# CHECK:         AddressAlignment: 8
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .talign3
+# CHECK:         Size: 8
+# CHECK:         AddressAlignment: 8
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .talign4
+# CHECK:         Size: 1
+# CHECK:         AddressAlignment: 1
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .dalign1
+# CHECK:         Size: 16
+# CHECK:         AddressAlignment: 16
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .dalign2
+# CHECK:         Size: 8
+# CHECK:         AddressAlignment: 8
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .dalign3
+# CHECK:         Size: 8
+# CHECK:         AddressAlignment: 8
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .dalign4
+# CHECK:         Size: 1
+# CHECK:         AddressAlignment: 1
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .dalign5
+# CHECK:         Size: 65536
+# CHECK:         AddressAlignment: 65536
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .nalign1
+# CHECK:         Size: 16
+# CHECK:         AddressAlignment: 16
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .nalign2
+# CHECK:         Size: 8
+# CHECK:         AddressAlignment: 8
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .nalign3
+# CHECK:         Size: 8
+# CHECK:         AddressAlignment: 8
+# CHECK-LABEL: }
+# CHECK-LABEL:   Name: .nalign4
+# CHECK:         Size: 1
+# CHECK:         AddressAlignment: 1
+# CHECK-LABEL: }