Author: Pavel Labath Date: 2020-08-26T13:17:26+02:00 New Revision: 82982304d7095891b10faacdbf9b4eb73e92a92f
URL: https://github.com/llvm/llvm-project/commit/82982304d7095891b10faacdbf9b4eb73e92a92f DIFF: https://github.com/llvm/llvm-project/commit/82982304d7095891b10faacdbf9b4eb73e92a92f.diff LOG: [lldb/DWARF] More DW_AT_const_value fixes This fixes several issues in handling of DW_AT_const_value attributes: - the first is that the size of the data given by data forms does not need to match the size of the underlying variable. We already had the case to handle this for DW_FORM_(us)data -- this extends the handling to other data forms. The main reason this was not picked up is because clang uses leb forms in these cases while gcc prefers the fixed-size ones. - The handling of DW_AT_strp form was completely broken -- we would end up using the pointer value as the result. I've reorganized this code so that it handles all string forms uniformly. - In case of a completely bogus form we would crash due to strlen(nullptr). Depends on D86311. Differential Revision: https://reviews.llvm.org/D86348 Added: lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value-bitfields.s Modified: lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value.s Removed: ################################################################################ diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp index 5ce392a57e0c..500d7567536e 100644 --- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp +++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp @@ -3169,44 +3169,18 @@ VariableSP SymbolFileDWARF::ParseVariableDIE(const SymbolContext &sc, DataExtractor(debug_info_data, block_offset, block_length), die.GetCU()); } else if (DWARFFormValue::IsDataForm(form_value.Form())) { - // Retrieve the value as a data expression. - uint32_t data_offset = attributes.DIEOffsetAtIndex(i); - if (auto data_length = form_value.GetFixedSize()) - location = DWARFExpression( - module, - DataExtractor(debug_info_data, data_offset, *data_length), - die.GetCU()); - else { - const uint8_t *data_pointer = form_value.BlockData(); - if (data_pointer) { - form_value.Unsigned(); - } else if (DWARFFormValue::IsDataForm(form_value.Form())) { - // we need to get the byte size of the type later after we - // create the variable - const_value = form_value; - } - } - } else { - // Retrieve the value as a string expression. - if (form_value.Form() == DW_FORM_strp) { - uint32_t data_offset = attributes.DIEOffsetAtIndex(i); - if (auto data_length = form_value.GetFixedSize()) - location = DWARFExpression(module, - DataExtractor(debug_info_data, - data_offset, - *data_length), - die.GetCU()); - } else { - const char *str = form_value.AsCString(); - uint32_t string_offset = - str - (const char *)debug_info_data.GetDataStart(); - uint32_t string_length = strlen(str) + 1; - location = DWARFExpression(module, - DataExtractor(debug_info_data, - string_offset, - string_length), - die.GetCU()); - } + // Constant value size does not have to match the size of the + // variable. We will fetch the size of the type after we create + // it. + const_value = form_value; + } else if (const char *str = form_value.AsCString()) { + uint32_t string_length = strlen(str) + 1; + location = DWARFExpression( + module, + DataExtractor(str, string_length, + die.GetCU()->GetByteOrder(), + die.GetCU()->GetAddressByteSize()), + die.GetCU()); } } break; diff --git a/lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value-bitfields.s b/lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value-bitfields.s new file mode 100644 index 000000000000..40f10d39130e --- /dev/null +++ b/lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value-bitfields.s @@ -0,0 +1,408 @@ +# RUN: llvm-mc -filetype=obj -o %t -triple x86_64-apple-macosx10.15.0 %s +# RUN: %lldb %t -o "target variable constant" -b | FileCheck %s + +# CHECK: (lldb) target variable constant +# CHECK: (U) constant = { +# CHECK: raw = 1688469761 +# CHECK: = (a = 1, b = 1, c = 36, d = 2, e = 36, f = 1) +# CHECK: } + +# This is testing when how ValueObjectVariable handles the case where the +# DWARFExpression holds the data that represents a constant value. +# Compile at -O1 allows us to capture this case. Below is the code used +# to generate the assembly: +# +# typedef union +# { +# unsigned raw; +# struct +# { +# unsigned a : 8; +# unsigned b : 8; +# unsigned c : 6; +# unsigned d : 2; +# unsigned e : 6; +# unsigned f : 2; +# } ; +# } U; +# +# static U __attribute__((used)) _type_anchor; +# static const int constant = 0x64A40101; +# +# int g() { return constant; } +# +# int main() { +# U u; +# u.raw = 0x64A40101; +# } +# +# Compiled as follows: +# +# clang -gdwarf-4 -O1 dw_at_const_value_bug.c -S -o dw_at_const_value_bug.s +# +# I was able to obtain a global of type U with DW_AT_const_value but was able +# to using int. This required modifying the DW_AT_type of constant to be type +# U. After that stripping as much of the assembly as possible to give us a +# smaller reproducer. + + +.zerofill __DATA,__bss,__type_anchor,4,2 ## @_type_anchor + .no_dead_strip __type_anchor + .section __DWARF,__debug_str,regular,debug +Linfo_string: + .zero 90 + .asciz "constant" ## string offset=90 + .asciz "int" ## string offset=99 + .asciz "_type_anchor" ## string offset=103 + .asciz "U" ## string offset=116 + .asciz "raw" ## string offset=118 + .asciz "unsigned int" ## string offset=122 + .asciz "a" ## string offset=135 + .asciz "b" ## string offset=137 + .asciz "c" ## string offset=139 + .asciz "d" ## string offset=141 + .asciz "e" ## string offset=143 + .asciz "f" ## string offset=145 + .asciz "g" ## string offset=147 + .asciz "main" ## string offset=149 + .asciz "u" ## string offset=154 + .section __DWARF,__debug_abbrev,regular,debug +Lsection_abbrev: + .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 66 ## DW_AT_stmt_list + .byte 23 ## DW_FORM_sec_offset + .byte 27 ## DW_AT_comp_dir + .byte 14 ## DW_FORM_strp + .ascii "\264B" ## DW_AT_GNU_pubnames + .byte 25 ## DW_FORM_flag_present + .ascii "\341\177" ## DW_AT_APPLE_optimized + .byte 25 ## DW_FORM_flag_present + .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 52 ## DW_TAG_variable + .byte 0 ## DW_CHILDREN_no + .byte 3 ## DW_AT_name + .byte 14 ## DW_FORM_strp + .byte 73 ## DW_AT_type + .byte 19 ## DW_FORM_ref4 + .byte 58 ## DW_AT_decl_file + .byte 11 ## DW_FORM_data1 + .byte 59 ## DW_AT_decl_line + .byte 11 ## DW_FORM_data1 + .byte 28 ## DW_AT_const_value + .byte 15 ## DW_FORM_udata + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 3 ## Abbreviation Code + .byte 38 ## DW_TAG_const_type + .byte 0 ## DW_CHILDREN_no + .byte 73 ## DW_AT_type + .byte 19 ## DW_FORM_ref4 + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 4 ## 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 5 ## Abbreviation Code + .byte 52 ## DW_TAG_variable + .byte 0 ## DW_CHILDREN_no + .byte 3 ## DW_AT_name + .byte 14 ## DW_FORM_strp + .byte 73 ## DW_AT_type + .byte 19 ## DW_FORM_ref4 + .byte 58 ## DW_AT_decl_file + .byte 11 ## DW_FORM_data1 + .byte 59 ## DW_AT_decl_line + .byte 11 ## DW_FORM_data1 + .byte 2 ## DW_AT_location + .byte 24 ## DW_FORM_exprloc + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 6 ## Abbreviation Code + .byte 22 ## DW_TAG_typedef + .byte 0 ## DW_CHILDREN_no + .byte 73 ## DW_AT_type + .byte 19 ## DW_FORM_ref4 + .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 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 7 ## Abbreviation Code + .byte 23 ## DW_TAG_union_type + .byte 1 ## DW_CHILDREN_yes + .byte 11 ## DW_AT_byte_size + .byte 11 ## DW_FORM_data1 + .byte 58 ## DW_AT_decl_file + .byte 11 ## DW_FORM_data1 + .byte 59 ## DW_AT_decl_line + .byte 11 ## DW_FORM_data1 + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 8 ## Abbreviation Code + .byte 13 ## DW_TAG_member + .byte 0 ## DW_CHILDREN_no + .byte 3 ## DW_AT_name + .byte 14 ## DW_FORM_strp + .byte 73 ## DW_AT_type + .byte 19 ## DW_FORM_ref4 + .byte 58 ## DW_AT_decl_file + .byte 11 ## DW_FORM_data1 + .byte 59 ## DW_AT_decl_line + .byte 11 ## DW_FORM_data1 + .byte 56 ## DW_AT_data_member_location + .byte 11 ## DW_FORM_data1 + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 9 ## Abbreviation Code + .byte 13 ## DW_TAG_member + .byte 0 ## DW_CHILDREN_no + .byte 73 ## DW_AT_type + .byte 19 ## DW_FORM_ref4 + .byte 58 ## DW_AT_decl_file + .byte 11 ## DW_FORM_data1 + .byte 59 ## DW_AT_decl_line + .byte 11 ## DW_FORM_data1 + .byte 56 ## DW_AT_data_member_location + .byte 11 ## DW_FORM_data1 + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 10 ## Abbreviation Code + .byte 19 ## DW_TAG_structure_type + .byte 1 ## DW_CHILDREN_yes + .byte 11 ## DW_AT_byte_size + .byte 11 ## DW_FORM_data1 + .byte 58 ## DW_AT_decl_file + .byte 11 ## DW_FORM_data1 + .byte 59 ## DW_AT_decl_line + .byte 11 ## DW_FORM_data1 + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 11 ## Abbreviation Code + .byte 13 ## DW_TAG_member + .byte 0 ## DW_CHILDREN_no + .byte 3 ## DW_AT_name + .byte 14 ## DW_FORM_strp + .byte 73 ## DW_AT_type + .byte 19 ## DW_FORM_ref4 + .byte 58 ## DW_AT_decl_file + .byte 11 ## DW_FORM_data1 + .byte 59 ## DW_AT_decl_line + .byte 11 ## DW_FORM_data1 + .byte 13 ## DW_AT_bit_size + .byte 11 ## DW_FORM_data1 + .byte 107 ## DW_AT_data_bit_offset + .byte 11 ## DW_FORM_data1 + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 12 ## 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 122 ## DW_AT_call_all_calls + .byte 25 ## DW_FORM_flag_present + .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 + .ascii "\341\177" ## DW_AT_APPLE_optimized + .byte 25 ## DW_FORM_flag_present + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 13 ## Abbreviation Code + .byte 46 ## DW_TAG_subprogram + .byte 1 ## DW_CHILDREN_yes + .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 122 ## DW_AT_call_all_calls + .byte 25 ## DW_FORM_flag_present + .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 + .ascii "\341\177" ## DW_AT_APPLE_optimized + .byte 25 ## DW_FORM_flag_present + .byte 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 14 ## Abbreviation Code + .byte 52 ## DW_TAG_variable + .byte 0 ## DW_CHILDREN_no + .byte 28 ## DW_AT_const_value + .byte 15 ## DW_FORM_udata + .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 0 ## EOM(1) + .byte 0 ## EOM(2) + .byte 0 ## EOM(3) + .section __DWARF,__debug_info,regular,debug +Lsection_info: +Lcu_begin0: +.set Lset0, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit + .long Lset0 +Ldebug_info_start0: + .short 4 ## DWARF version number +.set Lset1, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section + .long Lset1 + .byte 8 ## Address Size (in bytes) + .byte 1 ## Abbrev [1] 0xb:0x112 DW_TAG_compile_unit + .long 0 ## DW_AT_producer + .short 12 ## DW_AT_language + .long 47 ## DW_AT_name + .long 0 ## DW_AT_stmt_list + .long 71 ## DW_AT_comp_dir + ## DW_AT_GNU_pubnames + ## DW_AT_APPLE_optimized + .quad 0 ## DW_AT_low_pc + .long 0 + .byte 2 ## Abbrev [2] 0x2a:0x10 DW_TAG_variable + .long 90 ## DW_AT_name + .long 91 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 16 ## DW_AT_decl_line + .ascii "\201\202\220\245\006" ## DW_AT_const_value + .byte 3 ## Abbrev [3] 0x3a:0x5 DW_TAG_const_type + .long 63 ## DW_AT_type + .byte 4 ## Abbrev [4] 0x3f:0x7 DW_TAG_base_type + .long 99 ## DW_AT_name + .byte 5 ## DW_AT_encoding + .byte 4 ## DW_AT_byte_size + .byte 5 ## Abbrev [5] 0x46:0x15 DW_TAG_variable + .long 103 ## DW_AT_name + .long 91 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 15 ## DW_AT_decl_line + .byte 9 ## DW_AT_location + .byte 3 + .quad __type_anchor + .byte 6 ## Abbrev [6] 0x5b:0xb DW_TAG_typedef + .long 102 ## DW_AT_type + .long 116 ## DW_AT_name + .byte 1 ## DW_AT_decl_file + .byte 13 ## DW_AT_decl_line + .byte 7 ## Abbrev [7] 0x66:0x6c DW_TAG_union_type + .byte 4 ## DW_AT_byte_size + .byte 1 ## DW_AT_decl_file + .byte 1 ## DW_AT_decl_line + .byte 8 ## Abbrev [8] 0x6a:0xc DW_TAG_member + .long 118 ## DW_AT_name + .long 210 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 3 ## DW_AT_decl_line + .byte 0 ## DW_AT_data_member_location + .byte 9 ## Abbrev [9] 0x76:0x8 DW_TAG_member + .long 126 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 4 ## DW_AT_decl_line + .byte 0 ## DW_AT_data_member_location + .byte 10 ## Abbrev [10] 0x7e:0x53 DW_TAG_structure_type + .byte 4 ## DW_AT_byte_size + .byte 1 ## DW_AT_decl_file + .byte 4 ## DW_AT_decl_line + .byte 11 ## Abbrev [11] 0x82:0xd DW_TAG_member + .long 135 ## DW_AT_name + .long 210 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 6 ## DW_AT_decl_line + .byte 8 ## DW_AT_bit_size + .byte 0 ## DW_AT_data_bit_offset + .byte 11 ## Abbrev [11] 0x8f:0xd DW_TAG_member + .long 137 ## DW_AT_name + .long 210 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 7 ## DW_AT_decl_line + .byte 8 ## DW_AT_bit_size + .byte 8 ## DW_AT_data_bit_offset + .byte 11 ## Abbrev [11] 0x9c:0xd DW_TAG_member + .long 139 ## DW_AT_name + .long 210 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 8 ## DW_AT_decl_line + .byte 6 ## DW_AT_bit_size + .byte 16 ## DW_AT_data_bit_offset + .byte 11 ## Abbrev [11] 0xa9:0xd DW_TAG_member + .long 141 ## DW_AT_name + .long 210 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 9 ## DW_AT_decl_line + .byte 2 ## DW_AT_bit_size + .byte 22 ## DW_AT_data_bit_offset + .byte 11 ## Abbrev [11] 0xb6:0xd DW_TAG_member + .long 143 ## DW_AT_name + .long 210 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 10 ## DW_AT_decl_line + .byte 6 ## DW_AT_bit_size + .byte 24 ## DW_AT_data_bit_offset + .byte 11 ## Abbrev [11] 0xc3:0xd DW_TAG_member + .long 145 ## DW_AT_name + .long 210 ## DW_AT_type + .byte 1 ## DW_AT_decl_file + .byte 11 ## DW_AT_decl_line + .byte 2 ## DW_AT_bit_size + .byte 30 ## DW_AT_data_bit_offset + .byte 0 ## End Of Children Mark + .byte 0 ## End Of Children Mark + .byte 4 ## Abbrev [4] 0xd2:0x7 DW_TAG_base_type + .long 122 ## DW_AT_name + .byte 7 ## DW_AT_encoding + .byte 4 ## DW_AT_byte_size + .byte 14 ## Abbrev [14] 0x10b:0x10 DW_TAG_variable + .ascii "\201\202\220\245\006" ## DW_AT_const_value + .long 154 ## DW_AT_name + .byte 1 ## DW_AT_decl_file + .byte 21 ## DW_AT_decl_line + .long 91 ## DW_AT_type + .byte 0 ## End Of Children Mark + .byte 0 ## End Of Children Mark +Ldebug_info_end0: diff --git a/lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value.s b/lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value.s index 09c369ff083a..67c89b62339b 100644 --- a/lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value.s +++ b/lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value.s @@ -1,409 +1,158 @@ +# Test handling of (optimized-out/location-less) variables whose value is +# specified by DW_AT_const_value + # REQUIRES: x86 -# RUN: llvm-mc -filetype=obj -o %t -triple x86_64-apple-macosx10.15.0 %s -# RUN: %lldb %t -o "target variable constant" -b | FileCheck %s +# RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux %s -o %t +# RUN: %lldb %t \ +# RUN: -o "target variable udata data1 data2 data4 data8 string strp ref4" \ +# RUN: -o exit | FileCheck %s + +# CHECK-LABEL: target variable udata data1 data2 data4 data8 string strp ref4 +## Variable specified via DW_FORM_udata. This is typical for clang (10). +# CHECK: (unsigned long) udata = 4742474247424742 +## Variables specified via fixed-size forms. This is typical for gcc (9). +# CHECK: (unsigned long) data1 = 47 +# CHECK: (unsigned long) data2 = 4742 +# CHECK: (unsigned long) data4 = 47424742 +# CHECK: (unsigned long) data8 = 4742474247424742 +## Variables specified using string forms. This behavior purely speculative -- I +## don't know of any compiler that would represent character strings this way. +# CHECK: (char [7]) string = "string" +# CHECK: (char [7]) strp = "strp" +## Bogus attribute form. Let's make sure we don't crash at least. +# CHECK: (char [7]) ref4 = <empty constant data> + + .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 8 # DW_FORM_string + .byte 3 # DW_AT_name + .byte 8 # DW_FORM_string + .byte 0 # EOM(1) + .byte 0 # EOM(2) + .byte 4 # Abbreviation Code + .byte 1 # DW_TAG_array_type + .byte 1 # DW_CHILDREN_yes + .byte 73 # DW_AT_type + .byte 19 # DW_FORM_ref4 + .byte 0 # EOM(1) + .byte 0 # EOM(2) + .byte 5 # Abbreviation Code + .byte 33 # DW_TAG_subrange_type + .byte 0 # DW_CHILDREN_no + .byte 73 # DW_AT_type + .byte 19 # DW_FORM_ref4 + .byte 55 # DW_AT_count + .byte 11 # DW_FORM_data1 + .byte 0 # EOM(1) + .byte 0 # EOM(2) + .byte 6 # Abbreviation Code + .byte 36 # DW_TAG_base_type + .byte 0 # DW_CHILDREN_no + .byte 3 # DW_AT_name + .byte 8 # DW_FORM_string + .byte 11 # DW_AT_byte_size + .byte 11 # DW_FORM_data1 + .byte 62 # DW_AT_encoding + .byte 11 # DW_FORM_data1 + .byte 0 # EOM(1) + .byte 0 # EOM(2) +.macro var code, form + .byte \code # Abbreviation Code + .byte 52 # DW_TAG_variable + .byte 0 # DW_CHILDREN_no + .byte 3 # DW_AT_name + .byte 8 # DW_FORM_string + .byte 73 # DW_AT_type + .byte 19 # DW_FORM_ref4 + .byte 28 # DW_AT_const_value + .byte \form + .byte 0 # EOM(1) + .byte 0 # EOM(2) +.endm + var 10, 0xf # DW_FORM_udata + var 11, 0xb # DW_FORM_data1 + var 12, 0x5 # DW_FORM_data2 + var 13, 0x6 # DW_FORM_data4 + var 14, 0x7 # DW_FORM_data8 + var 15, 0x8 # DW_FORM_string + var 16, 0xe # DW_FORM_strp + var 17, 0x13 # DW_FORM_ref4 + .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 DW_TAG_compile_unit + .asciz "Hand-written DWARF" # DW_AT_producer + .asciz "const.c" # DW_AT_name +.Lchar_arr: + .byte 4 # Abbrev DW_TAG_array_type + .long .Lchar-.Lcu_begin0 # DW_AT_type + .byte 5 # Abbrev DW_TAG_subrange_type + .long .Lulong-.Lcu_begin0 # DW_AT_type + .byte 7 # DW_AT_count + .byte 0 # End Of Children Mark +.Lchar: + .byte 6 # Abbrev DW_TAG_base_type + .asciz "char" # DW_AT_name + .byte 1 # DW_AT_byte_size + .byte 6 # DW_AT_encoding +.Lulong: + .byte 6 # Abbrev DW_TAG_base_type + .asciz "unsigned long" # DW_AT_name + .byte 8 # DW_AT_byte_size + .byte 7 # DW_AT_encoding + + .byte 10 # Abbrev DW_TAG_variable + .asciz "udata" # DW_AT_name + .long .Lulong-.Lcu_begin0 # DW_AT_type + .uleb128 4742474247424742 # DW_AT_const_value + + .byte 11 # Abbrev DW_TAG_variable + .asciz "data1" # DW_AT_name + .long .Lulong-.Lcu_begin0 # DW_AT_type + .byte 47 # DW_AT_const_value + + .byte 12 # Abbrev DW_TAG_variable + .asciz "data2" # DW_AT_name + .long .Lulong-.Lcu_begin0 # DW_AT_type + .word 4742 # DW_AT_const_value + + .byte 13 # Abbrev DW_TAG_variable + .asciz "data4" # DW_AT_name + .long .Lulong-.Lcu_begin0 # DW_AT_type + .long 47424742 # DW_AT_const_value + + .byte 14 # Abbrev DW_TAG_variable + .asciz "data8" # DW_AT_name + .long .Lulong-.Lcu_begin0 # DW_AT_type + .quad 4742474247424742 # DW_AT_const_value + + .byte 15 # Abbrev DW_TAG_variable + .asciz "string" # DW_AT_name + .long .Lchar_arr-.Lcu_begin0 # DW_AT_type + .asciz "string" # DW_AT_const_value -# CHECK: (lldb) target variable constant -# CHECK: (U) constant = { -# CHECK: raw = 1688469761 -# CHECK: = (a = 1, b = 1, c = 36, d = 2, e = 36, f = 1) -# CHECK: } + .byte 16 # Abbrev DW_TAG_variable + .asciz "strp" # DW_AT_name + .long .Lchar_arr-.Lcu_begin0 # DW_AT_type + .long .Lstrp # DW_AT_const_value -# Test we are able to display a variable whose value is given by DW_AT_const_value. -# Compiling at -O1 allows us to capture this case. Below is the code used -# to generate the assembly: -# -# typedef union -# { -# unsigned raw; -# struct -# { -# unsigned a : 8; -# unsigned b : 8; -# unsigned c : 6; -# unsigned d : 2; -# unsigned e : 6; -# unsigned f : 2; -# } ; -# } U; -# -# static U __attribute__((used)) _type_anchor; -# static const int constant = 0x64A40101; -# -# int g() { return constant; } -# -# int main() { -# U u; -# u.raw = 0x64A40101; -# } -# -# Compiled as follows: -# -# clang -gdwarf-4 -O1 dw_at_const_value_bug.c -S -o dw_at_const_value_bug.s -# -# I was not able to obtain a global of type U with DW_AT_const_value but was able -# to using int. This required modifying the DW_AT_type of constant to be type -# U. After that stripping as much of the assembly as possible to give us a -# smaller reproducer. + .byte 17 # Abbrev DW_TAG_variable + .asciz "ref4" # DW_AT_name + .long .Lchar_arr-.Lcu_begin0 # DW_AT_type + .long .Lulong-.Lcu_begin0 # DW_AT_const_value + .byte 0 # End Of Children Mark +.Ldebug_info_end0: -.zerofill __DATA,__bss,__type_anchor,4,2 ## @_type_anchor - .no_dead_strip __type_anchor - .section __DWARF,__debug_str,regular,debug -Linfo_string: - .zero 90 - .asciz "constant" ## string offset=90 - .asciz "int" ## string offset=99 - .asciz "_type_anchor" ## string offset=103 - .asciz "U" ## string offset=116 - .asciz "raw" ## string offset=118 - .asciz "unsigned int" ## string offset=122 - .asciz "a" ## string offset=135 - .asciz "b" ## string offset=137 - .asciz "c" ## string offset=139 - .asciz "d" ## string offset=141 - .asciz "e" ## string offset=143 - .asciz "f" ## string offset=145 - .asciz "g" ## string offset=147 - .asciz "main" ## string offset=149 - .asciz "u" ## string offset=154 - .section __DWARF,__debug_abbrev,regular,debug -Lsection_abbrev: - .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 66 ## DW_AT_stmt_list - .byte 23 ## DW_FORM_sec_offset - .byte 27 ## DW_AT_comp_dir - .byte 14 ## DW_FORM_strp - .ascii "\264B" ## DW_AT_GNU_pubnames - .byte 25 ## DW_FORM_flag_present - .ascii "\341\177" ## DW_AT_APPLE_optimized - .byte 25 ## DW_FORM_flag_present - .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 52 ## DW_TAG_variable - .byte 0 ## DW_CHILDREN_no - .byte 3 ## DW_AT_name - .byte 14 ## DW_FORM_strp - .byte 73 ## DW_AT_type - .byte 19 ## DW_FORM_ref4 - .byte 58 ## DW_AT_decl_file - .byte 11 ## DW_FORM_data1 - .byte 59 ## DW_AT_decl_line - .byte 11 ## DW_FORM_data1 - .byte 28 ## DW_AT_const_value - .byte 15 ## DW_FORM_udata - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 3 ## Abbreviation Code - .byte 38 ## DW_TAG_const_type - .byte 0 ## DW_CHILDREN_no - .byte 73 ## DW_AT_type - .byte 19 ## DW_FORM_ref4 - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 4 ## 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 5 ## Abbreviation Code - .byte 52 ## DW_TAG_variable - .byte 0 ## DW_CHILDREN_no - .byte 3 ## DW_AT_name - .byte 14 ## DW_FORM_strp - .byte 73 ## DW_AT_type - .byte 19 ## DW_FORM_ref4 - .byte 58 ## DW_AT_decl_file - .byte 11 ## DW_FORM_data1 - .byte 59 ## DW_AT_decl_line - .byte 11 ## DW_FORM_data1 - .byte 2 ## DW_AT_location - .byte 24 ## DW_FORM_exprloc - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 6 ## Abbreviation Code - .byte 22 ## DW_TAG_typedef - .byte 0 ## DW_CHILDREN_no - .byte 73 ## DW_AT_type - .byte 19 ## DW_FORM_ref4 - .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 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 7 ## Abbreviation Code - .byte 23 ## DW_TAG_union_type - .byte 1 ## DW_CHILDREN_yes - .byte 11 ## DW_AT_byte_size - .byte 11 ## DW_FORM_data1 - .byte 58 ## DW_AT_decl_file - .byte 11 ## DW_FORM_data1 - .byte 59 ## DW_AT_decl_line - .byte 11 ## DW_FORM_data1 - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 8 ## Abbreviation Code - .byte 13 ## DW_TAG_member - .byte 0 ## DW_CHILDREN_no - .byte 3 ## DW_AT_name - .byte 14 ## DW_FORM_strp - .byte 73 ## DW_AT_type - .byte 19 ## DW_FORM_ref4 - .byte 58 ## DW_AT_decl_file - .byte 11 ## DW_FORM_data1 - .byte 59 ## DW_AT_decl_line - .byte 11 ## DW_FORM_data1 - .byte 56 ## DW_AT_data_member_location - .byte 11 ## DW_FORM_data1 - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 9 ## Abbreviation Code - .byte 13 ## DW_TAG_member - .byte 0 ## DW_CHILDREN_no - .byte 73 ## DW_AT_type - .byte 19 ## DW_FORM_ref4 - .byte 58 ## DW_AT_decl_file - .byte 11 ## DW_FORM_data1 - .byte 59 ## DW_AT_decl_line - .byte 11 ## DW_FORM_data1 - .byte 56 ## DW_AT_data_member_location - .byte 11 ## DW_FORM_data1 - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 10 ## Abbreviation Code - .byte 19 ## DW_TAG_structure_type - .byte 1 ## DW_CHILDREN_yes - .byte 11 ## DW_AT_byte_size - .byte 11 ## DW_FORM_data1 - .byte 58 ## DW_AT_decl_file - .byte 11 ## DW_FORM_data1 - .byte 59 ## DW_AT_decl_line - .byte 11 ## DW_FORM_data1 - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 11 ## Abbreviation Code - .byte 13 ## DW_TAG_member - .byte 0 ## DW_CHILDREN_no - .byte 3 ## DW_AT_name - .byte 14 ## DW_FORM_strp - .byte 73 ## DW_AT_type - .byte 19 ## DW_FORM_ref4 - .byte 58 ## DW_AT_decl_file - .byte 11 ## DW_FORM_data1 - .byte 59 ## DW_AT_decl_line - .byte 11 ## DW_FORM_data1 - .byte 13 ## DW_AT_bit_size - .byte 11 ## DW_FORM_data1 - .byte 107 ## DW_AT_data_bit_offset - .byte 11 ## DW_FORM_data1 - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 12 ## 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 122 ## DW_AT_call_all_calls - .byte 25 ## DW_FORM_flag_present - .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 - .ascii "\341\177" ## DW_AT_APPLE_optimized - .byte 25 ## DW_FORM_flag_present - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 13 ## Abbreviation Code - .byte 46 ## DW_TAG_subprogram - .byte 1 ## DW_CHILDREN_yes - .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 122 ## DW_AT_call_all_calls - .byte 25 ## DW_FORM_flag_present - .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 - .ascii "\341\177" ## DW_AT_APPLE_optimized - .byte 25 ## DW_FORM_flag_present - .byte 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 14 ## Abbreviation Code - .byte 52 ## DW_TAG_variable - .byte 0 ## DW_CHILDREN_no - .byte 28 ## DW_AT_const_value - .byte 15 ## DW_FORM_udata - .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 0 ## EOM(1) - .byte 0 ## EOM(2) - .byte 0 ## EOM(3) - .section __DWARF,__debug_info,regular,debug -Lsection_info: -Lcu_begin0: -.set Lset0, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit - .long Lset0 -Ldebug_info_start0: - .short 4 ## DWARF version number -.set Lset1, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section - .long Lset1 - .byte 8 ## Address Size (in bytes) - .byte 1 ## Abbrev [1] 0xb:0x112 DW_TAG_compile_unit - .long 0 ## DW_AT_producer - .short 12 ## DW_AT_language - .long 47 ## DW_AT_name - .long 0 ## DW_AT_stmt_list - .long 71 ## DW_AT_comp_dir - ## DW_AT_GNU_pubnames - ## DW_AT_APPLE_optimized - .quad 0 ## DW_AT_low_pc - .long 0 - .byte 2 ## Abbrev [2] 0x2a:0x10 DW_TAG_variable - .long 90 ## DW_AT_name - .long 91 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 16 ## DW_AT_decl_line - .ascii "\201\202\220\245\006" ## DW_AT_const_value - .byte 3 ## Abbrev [3] 0x3a:0x5 DW_TAG_const_type - .long 63 ## DW_AT_type - .byte 4 ## Abbrev [4] 0x3f:0x7 DW_TAG_base_type - .long 99 ## DW_AT_name - .byte 5 ## DW_AT_encoding - .byte 4 ## DW_AT_byte_size - .byte 5 ## Abbrev [5] 0x46:0x15 DW_TAG_variable - .long 103 ## DW_AT_name - .long 91 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 15 ## DW_AT_decl_line - .byte 9 ## DW_AT_location - .byte 3 - .quad __type_anchor - .byte 6 ## Abbrev [6] 0x5b:0xb DW_TAG_typedef - .long 102 ## DW_AT_type - .long 116 ## DW_AT_name - .byte 1 ## DW_AT_decl_file - .byte 13 ## DW_AT_decl_line - .byte 7 ## Abbrev [7] 0x66:0x6c DW_TAG_union_type - .byte 4 ## DW_AT_byte_size - .byte 1 ## DW_AT_decl_file - .byte 1 ## DW_AT_decl_line - .byte 8 ## Abbrev [8] 0x6a:0xc DW_TAG_member - .long 118 ## DW_AT_name - .long 210 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 3 ## DW_AT_decl_line - .byte 0 ## DW_AT_data_member_location - .byte 9 ## Abbrev [9] 0x76:0x8 DW_TAG_member - .long 126 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 4 ## DW_AT_decl_line - .byte 0 ## DW_AT_data_member_location - .byte 10 ## Abbrev [10] 0x7e:0x53 DW_TAG_structure_type - .byte 4 ## DW_AT_byte_size - .byte 1 ## DW_AT_decl_file - .byte 4 ## DW_AT_decl_line - .byte 11 ## Abbrev [11] 0x82:0xd DW_TAG_member - .long 135 ## DW_AT_name - .long 210 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 6 ## DW_AT_decl_line - .byte 8 ## DW_AT_bit_size - .byte 0 ## DW_AT_data_bit_offset - .byte 11 ## Abbrev [11] 0x8f:0xd DW_TAG_member - .long 137 ## DW_AT_name - .long 210 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 7 ## DW_AT_decl_line - .byte 8 ## DW_AT_bit_size - .byte 8 ## DW_AT_data_bit_offset - .byte 11 ## Abbrev [11] 0x9c:0xd DW_TAG_member - .long 139 ## DW_AT_name - .long 210 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 8 ## DW_AT_decl_line - .byte 6 ## DW_AT_bit_size - .byte 16 ## DW_AT_data_bit_offset - .byte 11 ## Abbrev [11] 0xa9:0xd DW_TAG_member - .long 141 ## DW_AT_name - .long 210 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 9 ## DW_AT_decl_line - .byte 2 ## DW_AT_bit_size - .byte 22 ## DW_AT_data_bit_offset - .byte 11 ## Abbrev [11] 0xb6:0xd DW_TAG_member - .long 143 ## DW_AT_name - .long 210 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 10 ## DW_AT_decl_line - .byte 6 ## DW_AT_bit_size - .byte 24 ## DW_AT_data_bit_offset - .byte 11 ## Abbrev [11] 0xc3:0xd DW_TAG_member - .long 145 ## DW_AT_name - .long 210 ## DW_AT_type - .byte 1 ## DW_AT_decl_file - .byte 11 ## DW_AT_decl_line - .byte 2 ## DW_AT_bit_size - .byte 30 ## DW_AT_data_bit_offset - .byte 0 ## End Of Children Mark - .byte 0 ## End Of Children Mark - .byte 4 ## Abbrev [4] 0xd2:0x7 DW_TAG_base_type - .long 122 ## DW_AT_name - .byte 7 ## DW_AT_encoding - .byte 4 ## DW_AT_byte_size - .byte 14 ## Abbrev [14] 0x10b:0x10 DW_TAG_variable - .ascii "\201\202\220\245\006" ## DW_AT_const_value - .long 154 ## DW_AT_name - .byte 1 ## DW_AT_decl_file - .byte 21 ## DW_AT_decl_line - .long 91 ## DW_AT_type - .byte 0 ## End Of Children Mark - .byte 0 ## End Of Children Mark -Ldebug_info_end0: + .section .debug_str,"MS",@progbits,1 +.Lstrp: + .asciz "strp" _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
