src/librustc_target/abi/call/msp430.rs

   1 // Reference: MSP430 Embedded Application Binary Interface
   2 // http://www.ti.com/lit/an/slaa534/slaa534.pdf
   3
   4 use crate::abi::call::{ArgAbi, FnAbi};
   5
   6 // 3.5 Structures or Unions Passed and Returned by Reference
   7 //
   8 // "Structures (including classes) and unions larger than 32 bits are passed and
   9 // returned by reference. To pass a structure or union by reference, the caller
  10 // places its address in the appropriate location: either in a register or on
  11 // the stack, according to its position in the argument list. (..)"
  12 fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
  13     if ret.layout.is_aggregate() && ret.layout.size.bits() > 32 {
  14         ret.make_indirect();
  15     } else {
  16         ret.extend_integer_width_to(16);
  17     }
  18 }
  19
  20 fn classify_arg<Ty>(arg: &mut ArgAbi<'_, Ty>) {
  21     if arg.layout.is_aggregate() && arg.layout.size.bits() > 32 {
  22         arg.make_indirect();
  23     } else {
  24         arg.extend_integer_width_to(16);
  25     }
  26 }
  27
  28 pub fn compute_abi_info<Ty>(fn_abi: &mut FnAbi<'_, Ty>) {
  29     if !fn_abi.ret.is_ignore() {
  30         classify_ret(&mut fn_abi.ret);
  31     }
  32
  33     for arg in &mut fn_abi.args {
  34         if arg.is_ignore() {
  35             continue;
  36         }
  37         classify_arg(arg);
  38     }
  39 }