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Give a warning when no dwo files are provided (llvm#94336)
In some scenarios based on the split-dwarf build process, the dwo file is not generated as expected(That is to say, no dwo file path is stored in the binary). When the llvm-dwp tool is called to generate the .dwp file, it will exit without any warning. So, the plan is to prompt a warning to tell the user that the dwo file was not actually generated. <img width="699" alt="image" src="https://github.com/llvm/llvm-project/assets/150100070/5e5742f6-daad-450f-87e9-cb25449c3c7a">
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# RUN: llvm-mc --triple=x86_64-unknown-linux --filetype=obj -dwarf-version=4 %s -o non_split.o | ||
# RUN: llvm-dwp -e non_split.o -o non_split.dwp 2>&1 | FileCheck %s --check-prefix=CHECK-WARNING | ||
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# CHECK-WARNING: warning: executable file does not contain any references to dwo files | ||
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.ifdef GEN | ||
;--- main.c | ||
int main() { | ||
return 0; | ||
} | ||
;--- gen | ||
clang -g -S -gdwarf-4 main.c -o - | ||
.endif | ||
.text | ||
.file "main.c" | ||
.globl main # -- Begin function main | ||
.p2align 4, 0x90 | ||
.type main,@function | ||
main: # @main | ||
.Lfunc_begin0: | ||
.file 1 "/proc/self/cwd" "main.c" | ||
.loc 1 8 0 # main.c:8:0 | ||
.cfi_startproc | ||
# %bb.0: # %entry | ||
pushq %rbp | ||
.cfi_def_cfa_offset 16 | ||
.cfi_offset %rbp, -16 | ||
movq %rsp, %rbp | ||
.cfi_def_cfa_register %rbp | ||
xorl %eax, %eax | ||
movl $0, -4(%rbp) | ||
.Ltmp0: | ||
.loc 1 9 5 prologue_end # main.c:9:5 | ||
popq %rbp | ||
.cfi_def_cfa %rsp, 8 | ||
retq | ||
.Ltmp1: | ||
.Lfunc_end0: | ||
.size main, .Lfunc_end0-main | ||
.cfi_endproc | ||
# -- End function | ||
.section .debug_abbrev,"",@progbits | ||
.byte 1 # Abbreviation Code | ||
.byte 17 # DW_TAG_compile_unit | ||
.byte 1 # DW_CHILDREN_yes | ||
.byte 37 # DW_AT_producer | ||
.byte 14 # DW_FORM_strp | ||
.byte 19 # DW_AT_language | ||
.byte 5 # DW_FORM_data2 | ||
.byte 3 # DW_AT_name | ||
.byte 14 # DW_FORM_strp | ||
.byte 16 # DW_AT_stmt_list | ||
.byte 23 # DW_FORM_sec_offset | ||
.byte 27 # DW_AT_comp_dir | ||
.byte 14 # DW_FORM_strp | ||
.byte 17 # DW_AT_low_pc | ||
.byte 1 # DW_FORM_addr | ||
.byte 18 # DW_AT_high_pc | ||
.byte 6 # DW_FORM_data4 | ||
.byte 0 # EOM(1) | ||
.byte 0 # EOM(2) | ||
.byte 2 # Abbreviation Code | ||
.byte 46 # DW_TAG_subprogram | ||
.byte 0 # DW_CHILDREN_no | ||
.byte 17 # DW_AT_low_pc | ||
.byte 1 # DW_FORM_addr | ||
.byte 18 # DW_AT_high_pc | ||
.byte 6 # DW_FORM_data4 | ||
.byte 64 # DW_AT_frame_base | ||
.byte 24 # DW_FORM_exprloc | ||
.byte 3 # DW_AT_name | ||
.byte 14 # DW_FORM_strp | ||
.byte 58 # DW_AT_decl_file | ||
.byte 11 # DW_FORM_data1 | ||
.byte 59 # DW_AT_decl_line | ||
.byte 11 # DW_FORM_data1 | ||
.byte 73 # DW_AT_type | ||
.byte 19 # DW_FORM_ref4 | ||
.byte 63 # DW_AT_external | ||
.byte 25 # DW_FORM_flag_present | ||
.byte 0 # EOM(1) | ||
.byte 0 # EOM(2) | ||
.byte 3 # Abbreviation Code | ||
.byte 36 # DW_TAG_base_type | ||
.byte 0 # DW_CHILDREN_no | ||
.byte 3 # DW_AT_name | ||
.byte 14 # DW_FORM_strp | ||
.byte 62 # DW_AT_encoding | ||
.byte 11 # DW_FORM_data1 | ||
.byte 11 # DW_AT_byte_size | ||
.byte 11 # DW_FORM_data1 | ||
.byte 0 # EOM(1) | ||
.byte 0 # EOM(2) | ||
.byte 0 # EOM(3) | ||
.section .debug_info,"",@progbits | ||
.Lcu_begin0: | ||
.long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit | ||
.Ldebug_info_start0: | ||
.short 4 # DWARF version number | ||
.long .debug_abbrev # Offset Into Abbrev. Section | ||
.byte 8 # Address Size (in bytes) | ||
.byte 1 # Abbrev [1] 0xb:0x40 DW_TAG_compile_unit | ||
.long .Linfo_string0 # DW_AT_producer | ||
.short 12 # DW_AT_language | ||
.long .Linfo_string1 # DW_AT_name | ||
.long .Lline_table_start0 # DW_AT_stmt_list | ||
.long .Linfo_string2 # DW_AT_comp_dir | ||
.quad .Lfunc_begin0 # DW_AT_low_pc | ||
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc | ||
.byte 2 # Abbrev [2] 0x2a:0x19 DW_TAG_subprogram | ||
.quad .Lfunc_begin0 # DW_AT_low_pc | ||
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc | ||
.byte 1 # DW_AT_frame_base | ||
.byte 86 | ||
.long .Linfo_string3 # DW_AT_name | ||
.byte 1 # DW_AT_decl_file | ||
.byte 8 # DW_AT_decl_line | ||
.long 67 # DW_AT_type | ||
# DW_AT_external | ||
.byte 3 # Abbrev [3] 0x43:0x7 DW_TAG_base_type | ||
.long .Linfo_string4 # DW_AT_name | ||
.byte 5 # DW_AT_encoding | ||
.byte 4 # DW_AT_byte_size | ||
.byte 0 # End Of Children Mark | ||
.Ldebug_info_end0: | ||
.section .debug_str,"MS",@progbits,1 | ||
.Linfo_string0: | ||
.byte 0 # string offset=0 | ||
.Linfo_string1: | ||
.asciz "main.c" # string offset=1 | ||
.Linfo_string2: | ||
.asciz "/proc/self/cwd" # string offset=8 | ||
.Linfo_string3: | ||
.asciz "main" # string offset=23 | ||
.Linfo_string4: | ||
.asciz "int" # string offset=28 | ||
.section .GCC.command.line,"MS",@progbits,1 | ||
.zero 1 | ||
.ascii "/usr/local/bin/clang-11 -Qn -g -S -gdwarf-4 main.c -o -" | ||
.zero 1 | ||
.section .debug_str,"MS",@progbits,1 | ||
.section ".note.GNU-stack","",@progbits | ||
.addrsig | ||
.section .debug_line,"",@progbits | ||
.Lline_table_start0: |
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