[Dwarf-Discuss] Problems understanding attribute DW_AT_location of global variables (Form DW_FORM_BLOCK)

[happyfrank3d@web.de]

Hi, 

I have some problems understanding the attribute DW_AT_location of global variables. 
My small C++ application has the following DWARF output: (version 2) 

[?] 

<1><11f>: Abbrev Number: 12 (DW_TAG_variable) 
??? <120>?? DW_AT_name??????? : (indirect string, offset: 0x15a): global01????? 
??? <124>?? DW_AT_decl_file?? : 1?????? 
??? <125>?? DW_AT_decl_line?? : 5?????? 
??? <126>?? DW_AT_type??????? : <0x4f>? 
??? <12a>?? DW_AT_external??? : 1?????? 
??? <12b>?? DW_AT_location??? : 5 byte block: 3 0 0 0 0 ??????? (DW_OP_addr: 0) 
?<1><131>: Abbrev Number: 12 (DW_TAG_variable) 
??? <132>?? DW_AT_name??????? : (indirect string, offset: 0x163): global02????? 
??? <136>?? DW_AT_decl_file?? : 1?????? 
??? <137>?? DW_AT_decl_line?? : 6?????? 
??? <138>?? DW_AT_type??????? : <0x4f>? 
??? <13c>?? DW_AT_external??? : 1?????? 
??? <13d>?? DW_AT_location??? : 5 byte block: 3 4 0 0 0 ??????? (DW_OP_addr: 4) 
?<1><143>: Abbrev Number: 12 (DW_TAG_variable) 
??? <144>?? DW_AT_name??????? : (indirect string, offset: 0x16c): global03????? 
??? <148>?? DW_AT_decl_file?? : 1?????? 
??? <149>?? DW_AT_decl_line?? : 7?????? 
??? <14a>?? DW_AT_type??????? : <0x4f>? 
??? <14e>?? DW_AT_external??? : 1?????? 
??? <14f>?? DW_AT_location??? : 5 byte block: 3 8 0 0 0 ??????? (DW_OP_addr: 8) 

[?] 

?<1><275>: Abbrev Number: 12 (DW_TAG_variable) 
??? <276>?? DW_AT_name??????? : (indirect string, offset: 0x96): global20?????? 
??? <27a>?? DW_AT_decl_file?? : 1?????? 
??? <27b>?? DW_AT_decl_line?? : 24????? 
??? <27c>?? DW_AT_type??????? : <0x4f>? 
??? <280>?? DW_AT_external??? : 1?????? 
??? <281>?? DW_AT_location??? : 5 byte block: 3 4c 0 0 0 ?????? (DW_OP_addr: 4c) 

All variables are of type int(4 byte). 

1. What does the value "5 byte block: 3 0 0 0 0" in this special case mean? 
2. What does the value "3" stand for? 
3. Is the virtual address of variable "global01" 0x0000? 
4. What does the offset in the section .debug_pubtypes of the global variables mean? 

Thank you for your help. 

Best regards, 
Frank

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