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clang-p2996/llvm/test/CodeGen/X86/gcc_except_table_bb_sections.ll
Sriraman Tallam 34e70d722d Append ".__part." to every basic block section symbol. 
Every basic block section symbol created by -fbasic-block-sections will contain
".__part." to know that this symbol corresponds to a basic block fragment of
the function.

This patch solves two problems:

a) Like D89617, we want function symbols with suffixes to be properly qualified
   so that external tools like profile aggregators know exactly what this
   symbol corresponds to.
b) The current basic block naming just adds a ".N" to the symbol name where N is
   some integer. This collides with how clang creates __cxx_global_var_init.N.
   clang creates these symbol names to call constructor functions and basic
   block symbol naming should not use the same style.

Fixed all the test cases and added an extra test for __cxx_global_var_init
breakage.

Differential Revision: https://reviews.llvm.org/D93082
2020-12-23 11:35:44 -08:00

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; RUN: llc -basic-block-sections=all -mtriple x86_64-pc-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,CHECK-NON-PIC
; RUN: llc -basic-block-sections=all -mtriple x86_64-pc-linux-gnu -relocation-model=pic < %s | FileCheck %s --check-prefixes=CHECK,CHECK-PIC
@_ZTIi = external constant i8*
define i32 @main() uwtable optsize ssp personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; Verify that each basic block section gets its own LSDA exception symbol.
;
; CHECK-LABEL: main:
; CHECK-NEXT: .Lfunc_begin0:
; CHECK-NEXT: .cfi_startproc
;; Verify personality function and LSDA encoding for NON-PIC mode.
; PersonalityEncoding = dwarf::DW_EH_PE_udata4
; CHECK-NON-PIC-NEXT: .cfi_personality 3, __gxx_personality_v0
; LSDAEncoding = dwarf::DW_EH_PE_udata4
; CHECK-NON-PIC-NEXT: .cfi_lsda 3, .Lexception0
;; Verify personality function and LSDA encoding for PIC mode.
; PersonalityEncoding = DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4
; CHECK-PIC-NEXT: .cfi_personality 155, DW.ref.__gxx_personality_v0
; LSDAEncoding = DW_EH_PE_pcrel | DW_EH_PE_sdata4
; CHECK-PIC-NEXT: .cfi_lsda 27, .Lexception0
; CHECK-LABEL: .Ltmp0:
; CHECK-NEXT: callq _Z1fv
; CHECK-LABEL: .Ltmp1:
; CHECK-NOT: .cfi_lsda
; CHECK-LABEL: main.__part.1:
; CHECK-NEXT: .cfi_startproc
; CHECK-NON-PIC-NEXT: .cfi_personality 3, __gxx_personality_v0
; CHECK-NON-PIC-NEXT: .cfi_lsda 3, .Lexception1
; CHECK-PIC-NEXT: .cfi_personality 155, DW.ref.__gxx_personality_v0
; CHECK-PIC-NEXT: .cfi_lsda 27, .Lexception1
; CHECK-NOT: .cfi_lsda
; CHECK-LABEL: main.__part.2:
; CHECK-NEXT: .cfi_startproc
; CHECK-NON-PIC-NEXT: .cfi_personality 3, __gxx_personality_v0
; CHECK-NON-PIC-NEXT: .cfi_lsda 3, .Lexception2
; CHECK-PIC-NEXT: .cfi_personality 155, DW.ref.__gxx_personality_v0
; CHECK-PIC-NEXT: .cfi_lsda 27, .Lexception2
; CHECK: nop
; CHECK-LABEL: .Ltmp2:
; CHECK-LABEL: .LBB_END0_2:
; CHECK-NOT: .cfi_lsda
entry:
invoke void @_Z1fv() optsize
to label %try.cont unwind label %lpad
lpad:
%0 = landingpad { i8*, i32 }
cleanup
catch i8* bitcast (i8** @_ZTIi to i8*)
br label %eh.resume
try.cont:
ret i32 0
eh.resume:
resume { i8*, i32 } %0
}
declare void @_Z1fv() optsize
declare i32 @__gxx_personality_v0(...)
;; Verify that the exception table gets split across the three basic block sections.
;
; CHECK: .section .gcc_except_table
; CHECK-NEXT: .p2align 2
; CHECK-NEXT: GCC_except_table0:
; CHECK-NEXT: .Lexception0:
;; Verify @LPStart encoding for NON-PIC mode.
; CHECK-NON-PIC-NEXT: .byte 0 # @LPStart Encoding = absptr
; CHECK-NON-PIC-NEXT: .quad main.__part.2
;; Verify @LPStart encoding for PIC mode.
; CHECK-PIC-NEXT: .byte 16 # @LPStart Encoding = pcrel
; CHECK-PIC-NEXT: [[DOT:\.Ltmp[0-9]+]]:
; CHECK-PIC-NEXT: .quad main.__part.2-[[DOT]]
;; Verify @TType encoding for NON-PIC mode.
; CHECK-NON-PIC-NEXT: .byte 3 # @TType Encoding = udata4
;; Verify @TType encoding for PIC mode.
; CHECK-PIC-NEXT: .byte 156 # @TType Encoding = indirect pcrel sdata8
; CHECK-NEXT: .uleb128 .Lttbase0-.Lttbaseref0
; CHECK-NEXT: .Lttbaseref0:
; CHECK-NEXT: .byte 1 # Call site Encoding = uleb128
; CHECK-NEXT: .uleb128 .Laction_table_base0-.Lcst_begin0
; CHECK-NEXT: .Lcst_begin0:
; CHECK-NEXT: .uleb128 .Ltmp0-.Lfunc_begin0 # >> Call Site 1 <<
; CHECK-NEXT: .uleb128 .Ltmp1-.Ltmp0 # Call between .Ltmp0 and .Ltmp1
; CHECK-NEXT: .uleb128 .Ltmp2-main.__part.2 # jumps to .Ltmp2
; CHECK-NEXT: .byte 3 # On action: 2
; CHECK-NEXT: .p2align 2
; CHECK-NEXT: .Lexception1:
; CHECK-NON-PIC-NEXT: .byte 0 # @LPStart Encoding = absptr
; CHECK-NON-PIC-NEXT: .quad main.__part.2
; CHECK-PIC-NEXT: .byte 16 # @LPStart Encoding = pcrel
; CHECK-PIC-NEXT: [[DOT:\.Ltmp[0-9]+]]:
; CHECK-PIC-NEXT: .quad main.__part.2-[[DOT]]
; CHECK-NON-PIC-NEXT: .byte 3 # @TType Encoding = udata4
; CHECK-PIC-NEXT: .byte 156 # @TType Encoding = indirect pcrel sdata8
; CHECK-NEXT: .uleb128 .Lttbase0-.Lttbaseref1
; CHECK-NEXT: .Lttbaseref1:
; CHECK-NEXT: .byte 1 # Call site Encoding = uleb128
; CHECK-NEXT: .uleb128 .Laction_table_base0-.Lcst_begin1
; CHECK-NEXT: .Lcst_begin1:
; CHECK-NEXT: .p2align 2
; CHECK-NEXT: .Lexception2:
; CHECK-NON-PIC-NEXT: .byte 0 # @LPStart Encoding = absptr
; CHECK-NON-PIC-NEXT: .quad main.__part.2
; CHECK-PIC-NEXT: .byte 16 # @LPStart Encoding = pcrel
; CHECK-PIC-NEXT: [[DOT:\.Ltmp[0-9]+]]:
; CHECK-PIC-NEXT: .quad main.__part.2-[[DOT]]
; CHECK-NON-PIC-NEXT: .byte 3 # @TType Encoding = udata4
; CHECK-PIC-NEXT: .byte 156 # @TType Encoding = indirect pcrel sdata8
; CHECK-NEXT: .uleb128 .Lttbase0-.Lttbaseref2
; CHECK-NEXT: .Lttbaseref2:
; CHECK-NEXT: .byte 1 # Call site Encoding = uleb128
; CHECK-NEXT: .uleb128 .Laction_table_base0-.Lcst_begin2
; CHECK-NEXT: .Lcst_begin2:
; CHECK-NEXT: .uleb128 main.__part.2-main.__part.2 # >> Call Site 2 <<
; CHECK-NEXT: .uleb128 .LBB_END0_2-main.__part.2 # Call between main.__part.2 and .LBB_END0_2
; CHECK-NEXT: .byte 0 # has no landing pad
; CHECK-NEXT: .byte 0 # On action: cleanup
; CHECK-NEXT: .Laction_table_base0:
; CHECK-NEXT: .byte 0 # >> Action Record 1 <<
; CHECK-NEXT: # Cleanup
; CHECK-NEXT: .byte 0 # No further actions
; CHECK-NEXT: .byte 1 # >> Action Record 2 <<
; CHECK-NEXT: # Catch TypeInfo 1
; CHECK-NEXT: .byte 125 # Continue to action 1
; CHECK-NEXT: .p2align 2
; CHECK-NEXT: # >> Catch TypeInfos <<
; CHECK-NON-PIC-NEXT: .long _ZTIi # TypeInfo 1
; CHECK-PIC-NEXT: [[DOT:\.Ltmp[0-9]+]]:
; CHECK-PIC-NEXT: .quad .L_ZTIi.DW.stub-[[DOT]]
; CHECK-NEXT: .Lttbase0:
; CHECK-NEXT: .p2align 2
; CHECK-NEXT: # -- End function
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