add cabi_msp430

Author: Jorge Aparicio

src/librustc_trans/abi.rs

@@ -24,6 +24,7 @@ use cabi_s390x;
 use cabi_mips;
 use cabi_mips64;
 use cabi_asmjs;
+use cabi_msp430;
 use machine::{llalign_of_min, llsize_of, llsize_of_alloc};
 use type_::Type;
 use type_of;
@@ -520,6 +521,7 @@ impl FnType {
             "s390x" => cabi_s390x::compute_abi_info(ccx, self),
             "asmjs" => cabi_asmjs::compute_abi_info(ccx, self),
             "wasm32" => cabi_asmjs::compute_abi_info(ccx, self),
+            "msp430" => cabi_msp430::compute_abi_info(ccx, self),
             a => ccx.sess().fatal(&format!("unrecognized arch \"{}\" in target specification", a))
         }
 

src/librustc_trans/cabi_msp430.rs

@@ -0,0 +1,59 @@
+// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Reference: MSP430 Embedded Application Binary Interface
+// http://www.ti.com/lit/an/slaa534/slaa534.pdf
+
+#![allow(non_upper_case_globals)]
+
+use llvm::Struct;
+
+use abi::{self, ArgType, FnType};
+use context::CrateContext;
+use type_::Type;
+
+fn ty_size(ty: Type) -> usize {
+    abi::ty_size(ty, 2)
+}
+
+// 3.5 Structures or Unions Passed and Returned by Reference
+//
+// "Structures (including classes) and unions larger than 32 bits are passed and
+// returned by reference. To pass a structure or union by reference, the caller
+// places its address in the appropriate location: either in a register or on
+// the stack, according to its position in the argument list. (..)"
+fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
+    if ret.ty.kind() == Struct && ty_size(ret.ty) > 32 {
+        ret.make_indirect(ccx);
+    } else {
+        ret.extend_integer_width_to(16);
+    }
+}
+
+fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
+    if arg.ty.kind() == Struct && ty_size(arg.ty) > 32 {
+        arg.make_indirect(ccx);
+    } else {
+        arg.extend_integer_width_to(16);
+    }
+}
+
+pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+    if !fty.ret.is_ignore() {
+        classify_ret_ty(ccx, &mut fty.ret);
+    }
+
+    for arg in &mut fty.args {
+        if arg.is_ignore() {
+            continue;
+        }
+        classify_arg_ty(ccx, arg);
+    }
+}

src/librustc_trans/lib.rs

@@ -101,6 +101,7 @@ mod cabi_arm;
 mod cabi_asmjs;
 mod cabi_mips;
 mod cabi_mips64;
+mod cabi_msp430;
 mod cabi_powerpc;
 mod cabi_powerpc64;
 mod cabi_s390x;