[BOLT] Add test checking LP trampolines in multi-split

This adds a test to verify that when splitting all blocks, landing pad
trampolines are inserted in all blocks.

Reviewed By: maksfb

Differential Revision: https://reviews.llvm.org/D132426

1 files changed, 191 insertions, 0 deletions

diff --git a/bolt/test/X86/split-all-lptrampoline.s b/bolt/test/X86/split-all-lptrampoline.s
new file mode 100644
index 000000000000..4629a2cf9b95
--- /dev/null
+++ b/bolt/test/X86/split-all-lptrampoline.s
@@ -0,0 +1,191 @@
+# This test checks that trampolines are inserted in split fragments if
+# necessary. There are 4 LSDA ranges with a landing pad to three landing pads.
+# After splitting all blocks, there have to be 4 trampolines in the output.
+
+# RUN: llvm-mc --filetype=obj --triple x86_64-unknown-unknown %s -o %t.o
+# RUN: %clangxx %cxxflags %t.o -o %t.exe -Wl,-q -pie
+# RUN: llvm-bolt %t.exe --split-functions --split-strategy=all --split-eh \
+# RUN:         -o %t.bolt --print-split --print-only=main 2>&1 | FileCheck %s
+
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+# CHECK: .LFT0
+# CHECK: Landing Pads: .LBB0
+# CHECK: .LBB0
+# CHECK-NEXT: Landing Pad
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+# CHECK: .Ltmp0
+# CHECK: Landing Pads: .LBB1, .LBB2
+# CHECK: .LBB1
+# CHECK-NEXT: Landing Pad
+# CHECK: .LBB2
+# CHECK-NEXT: Landing Pad
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+# CHECK: .Ltmp3
+# CHECK: Landing Pads: .LBB3
+# CHECK: .LBB3
+# CHECK-NEXT: Landing Pad
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+# CHECK: -------   HOT-COLD SPLIT POINT   -------
+
+        .text
+        .section        .rodata.str1.1,"aMS",@progbits,1
+.LC0:
+        .string "E"
+.LC1:
+        .string "C"
+        .text
+        .globl  main
+        .type   main, @function
+main:
+.LFB1265:
+        .cfi_startproc
+        .cfi_personality 0x9b,DW.ref.__gxx_personality_v0
+        .cfi_lsda 0x1b,.LLSDA1265
+        pushq   %r12
+        .cfi_def_cfa_offset 16
+        .cfi_offset 12, -16
+        pushq   %rbp
+        .cfi_def_cfa_offset 24
+        .cfi_offset 6, -24
+        pushq   %rbx
+        .cfi_def_cfa_offset 32
+        .cfi_offset 3, -32
+        testb   $3, %dil
+        jne     .L13
+        leaq    .LC1(%rip), %rdi
+.LEHB0:
+        call    puts@PLT
+        # Trampoline to .L9
+.LEHE0:
+        jmp     .L11
+.L13:
+        movl    $16, %edi
+        call    __cxa_allocate_exception@PLT
+        movq    %rax, %rbx
+        leaq    .LC0(%rip), %rsi
+        movq    %rax, %rdi
+.LEHB1:
+        call    _ZNSt13runtime_errorC1EPKc@PLT
+        # Trampoline to .L8
+.LEHE1:
+        movq    _ZNSt13runtime_errorD1Ev@GOTPCREL(%rip), %rdx
+        movq    _ZTISt13runtime_error@GOTPCREL(%rip), %rsi
+        movq    %rbx, %rdi
+.LEHB2:
+        call    __cxa_throw@PLT
+        # Trampoline to .L9
+.LEHE2:
+.L9:
+        movq    %rax, %rdi
+        movq    %rdx, %rax
+        jmp     .L4
+.L8:
+        movq    %rax, %r12
+        movq    %rdx, %rbp
+        movq    %rbx, %rdi
+        call    __cxa_free_exception@PLT
+        movq    %r12, %rdi
+        movq    %rbp, %rax
+.L4:
+        cmpq    $1, %rax
+        je      .L5
+.LEHB3:
+        call    _Unwind_Resume@PLT
+.LEHE3:
+.L5:
+        call    __cxa_begin_catch@PLT
+        movq    %rax, %rdi
+        movq    (%rax), %rax
+        call    *16(%rax)
+        movq    %rax, %rdi
+.LEHB4:
+        call    puts@PLT
+        # Trampoline to .L10
+.LEHE4:
+        call    __cxa_end_catch@PLT
+.L11:
+        movl    $0, %eax
+        popq    %rbx
+        .cfi_remember_state
+        .cfi_def_cfa_offset 24
+        popq    %rbp
+        .cfi_def_cfa_offset 16
+        popq    %r12
+        .cfi_def_cfa_offset 8
+        ret
+.L10:
+        .cfi_restore_state
+        movq    %rax, %rbx
+        call    __cxa_end_catch@PLT
+        movq    %rbx, %rdi
+.LEHB5:
+        call    _Unwind_Resume@PLT
+.LEHE5:
+        .cfi_endproc
+        .globl  __gxx_personality_v0
+        .section        .gcc_except_table,"a",@progbits
+        .align 4
+.LLSDA1265:
+        .byte   0xff
+        .byte   0x9b
+        .uleb128 .LLSDATT1265-.LLSDATTD1265
+.LLSDATTD1265:
+        .byte   0x1
+        .uleb128 .LLSDACSE1265-.LLSDACSB1265
+.LLSDACSB1265:
+        .uleb128 .LEHB0-.LFB1265
+        .uleb128 .LEHE0-.LEHB0
+        .uleb128 .L9-.LFB1265
+        .uleb128 0x1
+        .uleb128 .LEHB1-.LFB1265
+        .uleb128 .LEHE1-.LEHB1
+        .uleb128 .L8-.LFB1265
+        .uleb128 0x3
+        .uleb128 .LEHB2-.LFB1265
+        .uleb128 .LEHE2-.LEHB2
+        .uleb128 .L9-.LFB1265
+        .uleb128 0x1
+        .uleb128 .LEHB3-.LFB1265
+        .uleb128 .LEHE3-.LEHB3
+        .uleb128 0
+        .uleb128 0
+        .uleb128 .LEHB4-.LFB1265
+        .uleb128 .LEHE4-.LEHB4
+        .uleb128 .L10-.LFB1265
+        .uleb128 0
+        .uleb128 .LEHB5-.LFB1265
+        .uleb128 .LEHE5-.LEHB5
+        .uleb128 0
+        .uleb128 0
+.LLSDACSE1265:
+        .byte   0x1
+        .byte   0
+        .byte   0
+        .byte   0x7d
+        .align 4
+        .long   DW.ref._ZTISt13runtime_error-.
+.LLSDATT1265:
+        .text
+        .size   main, .-main
+        .hidden DW.ref._ZTISt13runtime_error
+        .weak   DW.ref._ZTISt13runtime_error
+        .section        .data.rel.local.DW.ref._ZTISt13runtime_error,"awG",@progbits,DW.ref._ZTISt13runtime_error,comdat
+        .align 8
+        .type   DW.ref._ZTISt13runtime_error, @object
+        .size   DW.ref._ZTISt13runtime_error, 8
+DW.ref._ZTISt13runtime_error:
+        .quad   _ZTISt13runtime_error
+        .hidden DW.ref.__gxx_personality_v0
+        .weak   DW.ref.__gxx_personality_v0
+        .section        .data.rel.local.DW.ref.__gxx_personality_v0,"awG",@progbits,DW.ref.__gxx_personality_v0,comdat
+        .align 8
+        .type   DW.ref.__gxx_personality_v0, @object
+        .size   DW.ref.__gxx_personality_v0, 8
+DW.ref.__gxx_personality_v0:
+        .quad   __gxx_personality_v0
+        .ident  "GCC: (Compiler-Explorer-Build-gcc--binutils-2.38) 12.1.0"
+        .section        .note.GNU-stack,"",@progbits