Add cabi_sparc64

Author: jakllsch

src/librustc_trans/abi.rs

@@ -25,6 +25,7 @@ use cabi_mips64;
 use cabi_asmjs;
 use cabi_msp430;
 use cabi_sparc;
+use cabi_sparc64;
 use machine::{llalign_of_min, llsize_of, llsize_of_alloc};
 use type_::Type;
 use type_of;
@@ -608,6 +609,7 @@ impl FnType {
             "wasm32" => cabi_asmjs::compute_abi_info(ccx, self),
             "msp430" => cabi_msp430::compute_abi_info(ccx, self),
             "sparc" => cabi_sparc::compute_abi_info(ccx, self),
+            "sparc64" => cabi_sparc64::compute_abi_info(ccx, self),
             a => ccx.sess().fatal(&format!("unrecognized arch \"{}\" in target specification", a))
         }
 

src/librustc_trans/cabi_sparc64.rs

@@ -0,0 +1,185 @@
+// Copyright 2014-2016 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.
+
+// FIXME: This needs an audit for correctness and completeness.
+
+use llvm::{Integer, Pointer, Float, Double, Struct, Vector, Array};
+use abi::{self, FnType, ArgType};
+use context::CrateContext;
+use type_::Type;
+
+fn ty_size(ty: Type) -> usize {
+    if ty.kind() == Vector {
+        bug!("ty_size: unhandled type")
+    } else {
+        abi::ty_size(ty, 8)
+    }
+}
+
+fn is_homogenous_aggregate_ty(ty: Type) -> Option<(Type, u64)> {
+    fn check_array(ty: Type) -> Option<(Type, u64)> {
+        let len = ty.array_length() as u64;
+        if len == 0 {
+            return None
+        }
+        let elt = ty.element_type();
+
+        // if our element is an HFA/HVA, so are we; multiply members by our len
+        is_homogenous_aggregate_ty(elt).map(|(base_ty, members)| (base_ty, len * members))
+    }
+
+    fn check_struct(ty: Type) -> Option<(Type, u64)> {
+        let str_tys = ty.field_types();
+        if str_tys.len() == 0 {
+            return None
+        }
+
+        let mut prev_base_ty = None;
+        let mut members = 0;
+        for opt_homog_agg in str_tys.iter().map(|t| is_homogenous_aggregate_ty(*t)) {
+            match (prev_base_ty, opt_homog_agg) {
+                // field isn't itself an HFA, so we aren't either
+                (_, None) => return None,
+
+                // first field - store its type and number of members
+                (None, Some((field_ty, field_members))) => {
+                    prev_base_ty = Some(field_ty);
+                    members = field_members;
+                },
+
+                // 2nd or later field - give up if it's a different type; otherwise incr. members
+                (Some(prev_ty), Some((field_ty, field_members))) => {
+                    if prev_ty != field_ty {
+                        return None;
+                    }
+                    members += field_members;
+                }
+            }
+        }
+
+        // Because of previous checks, we know prev_base_ty is Some(...) because
+        //   1. str_tys has at least one element; and
+        //   2. prev_base_ty was filled in (or we would've returned early)
+        let (base_ty, members) = (prev_base_ty.unwrap(), members);
+
+        // Ensure there is no padding.
+        if ty_size(ty) == ty_size(base_ty) * (members as usize) {
+            Some((base_ty, members))
+        } else {
+            None
+        }
+    }
+
+    let homog_agg = match ty.kind() {
+        Float  => Some((ty, 1)),
+        Double => Some((ty, 1)),
+        Array  => check_array(ty),
+        Struct => check_struct(ty),
+        _ => None
+    };
+
+    // Ensure we have at most eight uniquely addressable members
+    homog_agg.and_then(|(base_ty, members)| {
+        if members > 0 && members <= 8 {
+            Some((base_ty, members))
+        } else {
+            None
+        }
+    })
+}
+
+fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
+    if is_reg_ty(ret.ty) {
+        ret.extend_integer_width_to(64);
+        return;
+    }
+
+    // don't return aggregates in registers
+    ret.make_indirect(ccx);
+
+    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(ret.ty) {
+        ret.cast = Some(Type::array(&base_ty, members));
+        return;
+    }
+    let size = ty_size(ret.ty);
+    if size <= 16 {
+        let llty = if size <= 1 {
+            Type::i8(ccx)
+        } else if size <= 2 {
+            Type::i16(ccx)
+        } else if size <= 4 {
+            Type::i32(ccx)
+        } else if size <= 8 {
+            Type::i64(ccx)
+        } else {
+            Type::array(&Type::i64(ccx), ((size + 7 ) / 8 ) as u64)
+        };
+        ret.cast = Some(llty);
+        return;
+    }
+}
+
+fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
+    if is_reg_ty(arg.ty) {
+        arg.extend_integer_width_to(64);
+        return;
+    }
+
+    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(arg.ty) {
+        arg.cast = Some(Type::array(&base_ty, members));
+        return;
+    }
+
+    arg.cast = Some(struct_ty(ccx, arg.ty));
+}
+
+fn is_reg_ty(ty: Type) -> bool {
+    match ty.kind() {
+        Integer
+        | Pointer
+        | Float
+        | Double => true,
+        _ => false
+    }
+}
+
+fn coerce_to_long(ccx: &CrateContext, size: usize) -> Vec<Type> {
+    let long_ty = Type::i64(ccx);
+    let mut args = Vec::new();
+
+    let mut n = size / 64;
+    while n > 0 {
+        args.push(long_ty);
+        n -= 1;
+    }
+
+    let r = size % 64;
+    if r > 0 {
+        args.push(Type::ix(ccx, r as u64));
+    }
+
+    args
+}
+
+fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
+    let size = ty_size(ty) * 8;
+    Type::struct_(ccx, &coerce_to_long(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);
+    }
+
+    for arg in &mut fty.args {
+        if arg.is_ignore() { continue; }
+        classify_arg_ty(ccx, arg);
+    }
+}

src/librustc_trans/lib.rs

@@ -107,6 +107,7 @@ mod cabi_powerpc;
 mod cabi_powerpc64;
 mod cabi_s390x;
 mod cabi_sparc;
+mod cabi_sparc64;
 mod cabi_x86;
 mod cabi_x86_64;
 mod cabi_x86_win64;