llvm-6502/test/MC/ARM/dwarf-cfi-initial-state.s

# RUN: llvm-mc < %s -triple=armv7-linux-gnueabi -filetype=obj -o - \
# RUN:     | llvm-dwarfdump - | FileCheck %s

_proc:
.cfi_sections .debug_frame
.cfi_startproc
bx lr
.cfi_endproc

# CHECK: .debug_frame contents:
# CHECK: CIE
# CHECK-NOT: DW_CFA
# When llvm-dwarfdump prints the full info for the DW_CFA_def_cfa
# field, we can check that here too.
# CHECK: DW_CFA_def_cfa:
# CHECK-NOT: DW_CFA
# CHECK: FDE
ARM MC: Fix the initial DWARF CFI unwind info at the start of a function This brings MC into line with GNU 'as' on ARM, and it brings the ARM target into line with most other LLVM targets, which declare the initial CFI state with addInitialFrameState(). Without this, functions generated with .cfi_startproc/endproc on ARM will tend to cause GDB to abort with: gdb/dwarf2-frame.c:1132: internal-error: Unknown CFA rule. I've also tested this by comparing the output of "readelf -w" on the object files produced by llvm-mc and gas when given the .s file added here. This change is part of addressing PR18636. Differential Revision: http://llvm-reviews.chandlerc.com/D2597 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200255 91177308-0d34-0410-b5e6-96231b3b80d8 2014-01-27 22:38:14 +00:00			`# RUN: llvm-mc < %s -triple=armv7-linux-gnueabi -filetype=obj -o - \`
			`# RUN: \| llvm-dwarfdump - \| FileCheck %s`

[MC] Emit an error if cfi_startproc is used before a symbol is defined. Currently, we bind those directives with the last symbol, so if none has been defined, this would lead to a crash of the compiler. <rdar://problem/15939159> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206236 91177308-0d34-0410-b5e6-96231b3b80d8 2014-04-15 01:17:45 +00:00			`_proc:`
ARM MC: Fix the initial DWARF CFI unwind info at the start of a function This brings MC into line with GNU 'as' on ARM, and it brings the ARM target into line with most other LLVM targets, which declare the initial CFI state with addInitialFrameState(). Without this, functions generated with .cfi_startproc/endproc on ARM will tend to cause GDB to abort with: gdb/dwarf2-frame.c:1132: internal-error: Unknown CFA rule. I've also tested this by comparing the output of "readelf -w" on the object files produced by llvm-mc and gas when given the .s file added here. This change is part of addressing PR18636. Differential Revision: http://llvm-reviews.chandlerc.com/D2597 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200255 91177308-0d34-0410-b5e6-96231b3b80d8 2014-01-27 22:38:14 +00:00			`.cfi_sections .debug_frame`
			`.cfi_startproc`
			`bx lr`
			`.cfi_endproc`

			`# CHECK: .debug_frame contents:`
			`# CHECK: CIE`
			`# CHECK-NOT: DW_CFA`
			`# When llvm-dwarfdump prints the full info for the DW_CFA_def_cfa`
			`# field, we can check that here too.`
			`# CHECK: DW_CFA_def_cfa:`
			`# CHECK-NOT: DW_CFA`
			`# CHECK: FDE`