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# REQUIRES: webassembly-registered-target
# Test that DWARF tombstones are correctly detected/respected in wasm
# 32 bit object files.
# The test case was produced by the following steps:
#
# // test-clang.cpp
# void foo() {
# }
#
# 1) clang --target=wasm32 -S -g test-clang.cpp
# -o Inputs/wasm-32bit-tombstone.s
#
# 2) Creating a single function, tombstoning it in the assembly, by
# manually changing the DW_AT_low_pc for the DW_TAG_subprogram:
# .Lfunc_begin0 to 0xffffffff to mark the function as dead code:
#
# .int8 2 # Abbrev [2] 0x26:0x1b DW_TAG_subprogram
# .int32 .Lfunc_begin0 # DW_AT_low_pc <---------
# .int32 .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
# .int8 2 # Abbrev [2] 0x26:0x1b DW_TAG_subprogram
# .int32 0xffffffff # DW_AT_low_pc <---------
# .int32 .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
# RUN: llvm-mc -arch=wasm32 -filetype=obj \
# RUN: %p/wasm-32bit-tombstone.s \
# RUN: -o %t.wasm-32bit-tombstone.wasm
# RUN: llvm-debuginfo-analyzer --select-elements=Discarded \
# RUN: --print=elements \
# RUN: %t.wasm-32bit-tombstone.wasm 2>&1 | \
# RUN: FileCheck --strict-whitespace -check-prefix=ONE %s
# ONE: Logical View:
# ONE-NEXT: {File} '{{.*}}wasm-32bit-tombstone.wasm'
# ONE-EMPTY:
# ONE-NEXT: {CompileUnit} 'test-clang.cpp'
# ONE-NEXT: {Function} not_inlined 'foo' -> 'void'
# RUN: llvm-dwarfdump --debug-info %t.wasm-32bit-tombstone.wasm | \
# RUN: FileCheck %s --check-prefix=TWO
# TWO: DW_TAG_subprogram
# TWO-NEXT: DW_AT_low_pc (dead code)
# TWO-NEXT: DW_AT_high_pc
# TWO-NEXT: DW_AT_name ("foo")
.text
.file "test-clang.cpp"
.functype _Z3foov () -> ()
.section .text._Z3foov,"",@
_Z3foov: # @_Z3foov
.Lfunc_begin0:
.functype _Z3foov () -> ()
return
end_function
.Lfunc_end0:
# -- End function
.section .debug_abbrev,"",@
.int8 1 # Abbreviation Code
.int8 17 # DW_TAG_compile_unit
.int8 1 # DW_CHILDREN_yes
.int8 3 # DW_AT_name
.int8 14 # DW_FORM_strp
.int8 17 # DW_AT_low_pc
.int8 1 # DW_FORM_addr
.int8 18 # DW_AT_high_pc
.int8 6 # DW_FORM_data4
.int8 0 # EOM(1)
.int8 0 # EOM(2)
.int8 2 # Abbreviation Code
.int8 46 # DW_TAG_subprogram
.int8 0 # DW_CHILDREN_no
.int8 17 # DW_AT_low_pc
.int8 1 # DW_FORM_addr
.int8 18 # DW_AT_high_pc
.int8 6 # DW_FORM_data4
.int8 3 # DW_AT_name
.int8 14 # DW_FORM_strp
.int8 0 # EOM(1)
.int8 0 # EOM(2)
.int8 0 # EOM(3)
.section .debug_info,"",@
.Lcu_begin0:
.int32 .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
.Ldebug_info_start0:
.int16 4 # DWARF version number
.int32 .debug_abbrev0 # Offset Into Abbrev. Section
.int8 4 # Address Size (in bytes)
.int8 1 # Abbrev [1] 0xb:0x37 DW_TAG_compile_unit
.int32 .Linfo_string1 # DW_AT_name
.int32 .Lfunc_begin0 # DW_AT_low_pc
.int32 .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.int8 2 # Abbrev [2] 0x26:0x1b DW_TAG_subprogram
.int32 0xffffffff # DW_AT_low_pc
.int32 .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.int32 .Linfo_string4 # DW_AT_name
.int8 0 # End Of Children Mark
.Ldebug_info_end0:
.section .debug_str,"S",@
.Linfo_string1:
.asciz "test-clang.cpp" # string offset=176
.Linfo_string4:
.asciz "foo" # string offset=241
.ident "clang version 19.0.0"
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