[PATCH][GAS][AARCH64]Record instruction alignment for .inst directive.

[Renlin Li <renlin dot li at arm dot com>]

Hi all,

This is a simple patch that moves the alignment recording code in 
mapping_state early before it returns. So that, all code related 
alignment will be recorded.

For example, one case missed is for .inst directive. When .inst is 
processed, it will call frag_align_code first, which calls 
mapping_state_2 and set current state to MAP_INSN. Later when 
mapping_state is called, it will return early, because there is no state 
change.

For example,
.text
.short 0xffff
.inst 0x12345678   --> this will set MAP_INSN
ret                --> while processing this insn, mapping_state will 
early return as there is no state change.

The alignment of .text section will not be recorded.

Okay to commit?

Regards,
Renlin Li

gas/ChangeLog:

2015-04-28  Renlin Li  <renlin.li@arm.com>

    * config/tc-aarch64.c (mapping_state): Recording alignment before exit.

gas/testsuite/ChangeLog

2015-04-28  Renlin Li  <renlin.li@arm.com>

    * gas/aarch64/codealign_1.s: New.
    * gas/aarch64/codealign_1.d: New.

diff --git a/gas/config/tc-aarch64.c b/gas/config/tc-aarch64.c
index 5492ff4..231a578 100644
--- a/gas/config/tc-aarch64.c
+++ b/gas/config/tc-aarch64.c
@@ -1460,17 +1460,17 @@ mapping_state (enum mstate state)
 {
   enum mstate mapstate = seg_info (now_seg)->tc_segment_info_data.mapstate;
 
-  if (mapstate == state)
-    /* The mapping symbol has already been emitted.
-       There is nothing else to do.  */
-    return;
-
   if (state == MAP_INSN)
     /* AArch64 instructions require 4-byte alignment.  When emitting
        instructions into any section, record the appropriate section
        alignment.  */
     record_alignment (now_seg, 2);
 
+  if (mapstate == state)
+    /* The mapping symbol has already been emitted.
+       There is nothing else to do.  */
+    return;
+
 #define TRANSITION(from, to) (mapstate == (from) && state == (to))
   if (TRANSITION (MAP_UNDEFINED, MAP_DATA) && !subseg_text_p (now_seg))
     /* Emit MAP_DATA within executable section in order.  Otherwise, it will be
diff --git a/gas/testsuite/gas/aarch64/codealign_1.d b/gas/testsuite/gas/aarch64/codealign_1.d
new file mode 100644
index 0000000..08f4c25
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/codealign_1.d
@@ -0,0 +1,13 @@
+#objdump: --section-headers
+# Minimum code alignment should be set.
+
+.*: +file format.*aarch64.*
+
+Sections:
+Idx Name          Size      VMA               LMA               File off  Algn
+  0 \.text         .*  .*  .*  .*  2\*\*2
+                  .*CODE.*
+  1 \.data         .*  .*  .* .*  2\*\*0
+                  .*DATA.*
+  2 \.bss          .*  .*  .*  .*  2\*\*0
+.*
diff --git a/gas/testsuite/gas/aarch64/codealign_1.s b/gas/testsuite/gas/aarch64/codealign_1.s
new file mode 100644
index 0000000..b27cc6b
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/codealign_1.s
@@ -0,0 +1,3 @@
+.text
+  .byte 0xf
+  .inst 0xd503201f