[lldb-dev] No machine instructions loaded for symbols or target (python api)

[kwadwo amankwa via lldb-dev]

Hi,
I'm building an application on windows using the python api. I need to 
be able to access a code symbols instructions but when I launch the 
process the symbol has no instructions. I can manually read the symbols 
address space but the symbol also has no end_addr set which makes it 
difficult to tell where the symbol ends .
Can anybody help me to find out how to generate the instructions when 
the process is loaded ?


cheers,

Que
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Re: [lldb-dev] No machine instructions loaded for symbols or target (python api)

[Greg Clayton via lldb-dev]

It sounds like the symbols in the symbol table don't have valid sizes when they 
really should. What kind of executable are you debugging? A PECOFF file? If so, 
you should take a look at and fix the code in:

Symtab *
ObjectFilePECOFF::GetSymtab()

What we do for mach-o is to parse the symbol table first and then run back 
through all symbols, and any symbol that have a size of zero, set their sizes 
to the delta between the current symbol and the next addressed symbol. Since 
the symbols are usually out of order address wise, we run through all symbols 
that have addresses and add their indexes to a std::vector, then sort the 
vector of address indexes, and then we can do the above fixups.

Greg Clayton


> On Nov 17, 2015, at 4:21 AM, kwadwo amankwa via lldb-dev 
>  wrote:
> 
> Hi,
> I'm building an application on windows using the python api. I need to be 
> able to access a code symbols instructions but when I launch the process the 
> symbol has no instructions. I can manually read the symbols address space but 
> the symbol also has no end_addr set which makes it difficult to tell where 
> the symbol ends .
> Can anybody help me to find out how to generate the instructions when the 
> process is loaded ?
> 
> cheers,
> 
> Que
> ___
> lldb-dev mailing list
> lldb-dev@lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev

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Re: [lldb-dev] No machine instructions loaded for symbols or target (python api)

[kwadwo amankwa via lldb-dev]

Ok I see what you're saying. I was trying to use the next symbol address 
as a delimeter but I realised they were not in order.  It is a PECOFF 
binary that I'm debugging so I will take a look at the code suggested 
below.


Thanks ,

Que

On 17/11/15 18:07, Greg Clayton wrote:

It sounds like the symbols in the symbol table don't have valid sizes when they 
really should. What kind of executable are you debugging? A PECOFF file? If so, 
you should take a look at and fix the code in:

Symtab *
ObjectFilePECOFF::GetSymtab()

What we do for mach-o is to parse the symbol table first and then run back 
through all symbols, and any symbol that have a size of zero, set their sizes 
to the delta between the current symbol and the next addressed symbol. Since 
the symbols are usually out of order address wise, we run through all symbols 
that have addresses and add their indexes to a std::vector, then sort the 
vector of address indexes, and then we can do the above fixups.

Greg Clayton



On Nov 17, 2015, at 4:21 AM, kwadwo amankwa via lldb-dev 
 wrote:

Hi,
I'm building an application on windows using the python api. I need to be able 
to access a code symbols instructions but when I launch the process the symbol 
has no instructions. I can manually read the symbols address space but the 
symbol also has no end_addr set which makes it difficult to tell where the 
symbol ends .
Can anybody help me to find out how to generate the instructions when the 
process is loaded ?

cheers,

Que
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