//---
// fxos.passes.pcrel: Resolution of PC-relative addresses
//---

#include <fxos/disasm-passes/pcrel.h>

namespace FxOS {

PcrelPass::PcrelPass(Disassembly &disasm):
	DisassemblyPass(disasm)
{
}

void PcrelPass::analyze(uint32_t pc, ConcreteInstruction &ci)
{
	Instruction const &i = ci.inst;

	for(size_t n = 0; n < i.args.size(); n++)
	{
		Argument const &a = i.args[n];
		ConcreteInstructionArg &ca = ci.args[n];

		if(a.kind == Argument::PcRel)
		{
			uint32_t addr = (pc & ~(a.opsize - 1)) + 4 + a.disp;
			ca.location = RelConstDomain().constant(addr);

			/* Also compute the value. This is sign-extended from
			   16-bit with mov.w. There is no mov.b for this
			   instruction. */
			Target &t = m_disasm.target();
			uint32_t v;

			switch(i.opsize)
			{
			case 2:
				v = t.read_i16(addr);
				break;
			case 4:
				v = t.read_i32(addr);
				break;
			default:
				throw std::runtime_error("Wrong pcrel opsize");
			}

			ca.value = DataValue(IntegerType::u32);
			ca.value.write(0,4,v);
		}
		else if(a.kind == Argument::PcJump)
		{
			uint32_t addr = pc + 4 + a.disp;
			ca.location = RelConstDomain().constant(addr);
		}
	}

	enqueue_unseen_successors(pc, ci);
}

} /* namespace FxOS */