How to properly reference data added using the CodeAssembler .db function in 32-bit mode?

[netadr]

I've been having an issue referencing data embedded using the .db function of CodeAssembler:

Here's a snippet that demonstrates the issue:

let mut a = CodeAssembler::new(32)?;
let mut skip_data = a.create_label();
let mut data = a.create_label();

a.jmp(skip_data)?;
a.set_label(&mut data)?;
a.db(b"\x90\xCC\xF1\x90")?;
a.set_label(&mut skip_data)?;
a.lea(eax, dword_ptr(data))?;

a.assemble(0x0)?;

Calling .assemble returns the following error:
Error: Operand 1: 64-bit addressing can only be used in 64-bit mode : 0x1

Is this a case of user error or a bug within the library?

[wtfsck]

That example is from the README and uses 64-bit mode and will fail in 16/32-bit mode.

One workaround is to get the address of the label after assembling it (see assemble_options()?.label_ip() and then patching an instruction, eg. a 'mov eax,imm32' instruction. You can get the offset of the imm32 by passing in BlockEncoderOptions::RETURN_CONSTANT_OFFSETS | BlockEncoderOptions::RETURN_NEW_INSTRUCTION_OFFSETS to assemble_options().

Another one is to do something like:

call there
my_data:
db 1,2,3,4
there:
pop eax

eax now has the address of my_data.

I created an issue: #281