Implement AsmParser for ARM unwind directives.

This commit implements the AsmParser for fnstart, fnend,
cantunwind, personality, handlerdata, pad, setfp, save, and
vsave directives.

This commit fixes some minor issue in the ARMELFStreamer:

* The switch back to corresponding section after the .fnend
  directive.

* Emit the unwind opcode while processing .fnend directive
  if there is no .handlerdata directive.

* Emit the unwind opcode to .ARM.extab while processing
  .handlerdata even if .personality directive does not exist.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181603 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 31 insertions, 0 deletions

diff --git a/test/MC/ARM/eh-directive-fnstart-diagnostics.s b/test/MC/ARM/eh-directive-fnstart-diagnostics.s
new file mode 100644
index 0000000000..29bcb0dd9c
--- /dev/null
+++ b/test/MC/ARM/eh-directive-fnstart-diagnostics.s
@@ -0,0 +1,31 @@
+@ RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi \
+@ RUN:   -filetype=obj -o /dev/null 2>&1 | FileCheck %s
+
+@ Check the diagnostics for the mismatched .fnstart directives.
+
+@ There should be some diagnostics when the previous .fnstart is not closed
+@ by the .fnend directive.
+
+
+	.syntax unified
+	.text
+
+	.globl	func1
+	.align	2
+	.type	func1,%function
+	.fnstart
+func1:
+	@ Intentionally miss the .fnend directive
+
+	.globl	func2
+	.align	2
+	.type	func2,%function
+	.fnstart
+@ CHECK: error: .fnstart starts before the end of previous one
+@ CHECK:        .fnstart
+@ CHECK:        ^
+@ CHECK: error: previous .fnstart starts here
+@ CHECK:        .fnstart
+@ CHECK:        ^
+func2:
+	.fnend