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llvm-project/llvm/test/MC/ARM/eh-directive-cantunwind.s

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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. llvm-svn: 181603
2013-05-11 00:17:24 +08:00
@ RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o - \
@ RUN: | llvm-readobj -s -sd -sr | FileCheck %s
@ Check the .cantunwind directive
@ When a function contains a .cantunwind directive, we should create an entry
@ in corresponding .ARM.exidx, and its second word should be EXIDX_CANTUNWIND.
.syntax unified
.text
.globl func1
.align 2
.type func1,%function
.fnstart
func1:
bx lr
.cantunwind
.fnend
@-------------------------------------------------------------------------------
@ Check .text section
@-------------------------------------------------------------------------------
@ CHECK: Sections [
@ CHECK: Section {
@ CHECK: Name: .text
@ CHECK: SectionData (
@ CHECK: 0000: 1EFF2FE1 |../.|
@ CHECK: )
@ CHECK: }
@-------------------------------------------------------------------------------
@ Check .ARM.exidx section
@-------------------------------------------------------------------------------
@ CHECK: Section {
@ CHECK: Name: .ARM.exidx
@-------------------------------------------------------------------------------
@ The first word should be the offset to .text.
@ The second word should be EXIDX_CANTUNWIND (01000000).
@-------------------------------------------------------------------------------
@ CHECK: SectionData (
@ CHECK: 0000: 00000000 01000000 |........|
@ CHECK: )
@ CHECK: }
@ CHECK: ]
Change how we iterate over relocations on ELF. For COFF and MachO, sections semantically have relocations that apply to them. That is not the case on ELF. In relocatable objects (.o), a section with relocations in ELF has offsets to another section where the relocations should be applied. In dynamic objects and executables, relocations don't have an offset, they have a virtual address. The section sh_info may or may not point to another section, but that is not actually used for resolving the relocations. This patch exposes that in the ObjectFile API. It has the following advantages: * Most (all?) clients can handle this more efficiently. They will normally walk all relocations, so doing an effort to iterate in a particular order doesn't save time. * llvm-readobj now prints relocations in the same way the native readelf does. * probably most important, relocations that don't point to any section are now visible. This is the case of relocations in the rela.dyn section. See the updated relocation-executable.test for example. llvm-svn: 182908
2013-05-30 11:05:14 +08:00
@ CHECK: Relocations [
@ CHECK: 0x0 R_ARM_PREL31 .text 0x0
@ CHECK: ]