From 79d40c2bbe0210fb644ea9756a9bc80a897a6484 Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <japaricious@gmail.com>
Date: Mon, 12 Dec 2016 12:41:45 -0500
Subject: [PATCH] implement cabi for 32-bit sparc

---
 src/librustc_trans/abi.rs        |   2 +
 src/librustc_trans/cabi_sparc.rs | 108 +++++++++++++++++++++++++++++++
 src/librustc_trans/lib.rs        |   1 +
 3 files changed, 111 insertions(+)
 create mode 100644 src/librustc_trans/cabi_sparc.rs

diff --git a/src/librustc_trans/abi.rs b/src/librustc_trans/abi.rs
index 0ac853e99eecd..7502ae14ebcf0 100644
--- a/src/librustc_trans/abi.rs
+++ b/src/librustc_trans/abi.rs
@@ -25,6 +25,7 @@ use cabi_mips;
 use cabi_mips64;
 use cabi_asmjs;
 use cabi_msp430;
+use cabi_sparc;
 use machine::{llalign_of_min, llsize_of, llsize_of_alloc};
 use type_::Type;
 use type_of;
@@ -609,6 +610,7 @@ impl FnType {
             "asmjs" => cabi_asmjs::compute_abi_info(ccx, self),
             "wasm32" => cabi_asmjs::compute_abi_info(ccx, self),
             "msp430" => cabi_msp430::compute_abi_info(ccx, self),
+            "sparc" => cabi_sparc::compute_abi_info(ccx, self),
             a => ccx.sess().fatal(&format!("unrecognized arch \"{}\" in target specification", a))
         }
 
diff --git a/src/librustc_trans/cabi_sparc.rs b/src/librustc_trans/cabi_sparc.rs
new file mode 100644
index 0000000000000..25fe53e7ef40f
--- /dev/null
+++ b/src/librustc_trans/cabi_sparc.rs
@@ -0,0 +1,108 @@
+// 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.
+
+#![allow(non_upper_case_globals)]
+
+use libc::c_uint;
+use std::cmp;
+use llvm;
+use llvm::{Integer, Pointer, Float, Double, Vector};
+use abi::{self, align_up_to, ArgType, FnType};
+use context::CrateContext;
+use type_::Type;
+
+fn ty_align(ty: Type) -> usize {
+    abi::ty_align(ty, 4)
+}
+
+fn ty_size(ty: Type) -> usize {
+    abi::ty_size(ty, 4)
+}
+
+fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
+    if is_reg_ty(ret.ty) {
+        ret.extend_integer_width_to(32);
+    } else {
+        ret.make_indirect(ccx);
+    }
+}
+
+fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut usize) {
+    let orig_offset = *offset;
+    let size = ty_size(arg.ty) * 8;
+    let mut align = ty_align(arg.ty);
+
+    align = cmp::min(cmp::max(align, 4), 8);
+    *offset = align_up_to(*offset, align);
+    *offset += align_up_to(size, align * 8) / 8;
+
+    if !is_reg_ty(arg.ty) {
+        arg.cast = Some(struct_ty(ccx, arg.ty));
+        arg.pad = padding_ty(ccx, align, orig_offset);
+    } else {
+        arg.extend_integer_width_to(32);
+    }
+}
+
+fn is_reg_ty(ty: Type) -> bool {
+    return match ty.kind() {
+        Integer
+        | Pointer
+        | Float
+        | Double
+        | Vector => true,
+        _ => false
+    };
+}
+
+fn padding_ty(ccx: &CrateContext, align: usize, offset: usize) -> Option<Type> {
+    if ((align - 1 ) & offset) > 0 {
+        Some(Type::i32(ccx))
+    } else {
+        None
+    }
+}
+
+fn coerce_to_int(ccx: &CrateContext, size: usize) -> Vec<Type> {
+    let int_ty = Type::i32(ccx);
+    let mut args = Vec::new();
+
+    let mut n = size / 32;
+    while n > 0 {
+        args.push(int_ty);
+        n -= 1;
+    }
+
+    let r = size % 32;
+    if r > 0 {
+        unsafe {
+            args.push(Type::from_ref(llvm::LLVMIntTypeInContext(ccx.llcx(), r as c_uint)));
+        }
+    }
+
+    args
+}
+
+fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
+    let size = ty_size(ty) * 8;
+    Type::struct_(ccx, &coerce_to_int(ccx, size), false)
+}
+
+pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+    if !fty.ret.is_ignore() {
+        classify_ret_ty(ccx, &mut fty.ret);
+    }
+
+    let mut offset = if fty.ret.is_indirect() { 4 } else { 0 };
+    for arg in &mut fty.args {
+        if arg.is_ignore() { continue; }
+        classify_arg_ty(ccx, arg, &mut offset);
+    }
+}
diff --git a/src/librustc_trans/lib.rs b/src/librustc_trans/lib.rs
index d842827b6fead..0032ca1a68a62 100644
--- a/src/librustc_trans/lib.rs
+++ b/src/librustc_trans/lib.rs
@@ -107,6 +107,7 @@ mod cabi_msp430;
 mod cabi_powerpc;
 mod cabi_powerpc64;
 mod cabi_s390x;
+mod cabi_sparc;
 mod cabi_x86;
 mod cabi_x86_64;
 mod cabi_x86_win64;