Index: lldb/source/Core/ValueObjectVariable.cpp =================================================================== --- lldb/source/Core/ValueObjectVariable.cpp +++ lldb/source/Core/ValueObjectVariable.cpp @@ -132,8 +132,11 @@ if (variable->GetLocationIsConstantValueData()) { // expr doesn't contain DWARF bytes, it contains the constant variable // value bytes themselves... - if (expr.GetExpressionData(m_data)) + if (expr.GetExpressionData(m_data)) { + if (m_data.GetDataStart() && m_data.GetByteSize()) + m_value.SetBytes(m_data.GetDataStart(), m_data.GetByteSize()); m_value.SetContext(Value::eContextTypeVariable, variable); + } else m_error.SetErrorString("empty constant data"); // constant bytes can't be edited - sorry Index: lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value.s =================================================================== --- /dev/null +++ lldb/test/Shell/SymbolFile/DWARF/DW_AT_const_value.s @@ -0,0 +1,409 @@ +# 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 + +# 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: } + +# 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. + + +.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: