Add tests for RISC-V C ABI

src/test/auxiliary/rust_test_helpers.c

@@ -168,6 +168,18 @@ struct floats {
     double c;
 };
 
+struct char_char_double {
+    uint8_t a;
+    uint8_t b;
+    double c;
+};
+
+struct char_char_float {
+    uint8_t a;
+    uint8_t b;
+    float c;
+};
+
 struct quad
 rust_dbg_abi_1(struct quad q) {
     struct quad qq = { q.c + 1,
@@ -185,6 +197,23 @@ rust_dbg_abi_2(struct floats f) {
     return ff;
 }
 
+struct char_char_double
+rust_dbg_abi_3(struct char_char_double a) {
+    struct char_char_double ccd = { a.a + 1,
+                                    a.b - 1,
+                                    a.c + 1.0 };
+    return ccd;
+}
+
+struct char_char_float
+rust_dbg_abi_4(struct char_char_float a) {
+    struct char_char_float ccd = { a.a + 1,
+                                   a.b - 1,
+                                   a.c + 1.0 };
+    return ccd;
+}
+
+
 int
 rust_dbg_static_mut = 3;
 

src/test/codegen/riscv-abi/riscv64-lp64-lp64f-lp64d-abi.rs

@@ -0,0 +1,181 @@
+// ignore-tidy-linelength
+// compile-flags: -C no-prepopulate-passes
+// only-riscv64
+// only-linux
+#![crate_type = "lib"]
+#![allow(improper_ctypes)]
+
+// CHECK: define void @f_void()
+#[no_mangle]
+pub extern "C" fn f_void() {}
+
+// CHECK: define zeroext i1 @f_scalar_0(i1 zeroext %a)
+#[no_mangle]
+pub extern "C" fn f_scalar_0(a: bool) -> bool {
+    a
+}
+
+// CHECK: define signext i8 @f_scalar_1(i8 signext %x)
+#[no_mangle]
+pub extern "C" fn f_scalar_1(x: i8) -> i8 {
+    x
+}
+
+// CHECK: define zeroext i8 @f_scalar_2(i8 zeroext %x)
+#[no_mangle]
+pub extern "C" fn f_scalar_2(x: u8) -> u8 {
+    x
+}
+
+// CHECK: define signext i32 @f_scalar_3(i32 signext %x)
+#[no_mangle]
+pub extern "C" fn f_scalar_3(x: i32) -> u32 {
+    x as u32
+}
+
+// CHECK: define i64 @f_scalar_4(i64 %x)
+#[no_mangle]
+pub extern "C" fn f_scalar_4(x: i64) -> i64 {
+    x
+}
+
+// CHECK: define float @f_fp_scalar_1(float)
+#[no_mangle]
+pub extern "C" fn f_fp_scalar_1(x: f32) -> f32 {
+    x
+}
+// CHECK: define double @f_fp_scalar_2(double)
+#[no_mangle]
+pub extern "C" fn f_fp_scalar_2(x: f64) -> f64 {
+    x
+}
+
+#[repr(C)]
+pub struct Empty {}
+
+// CHECK: define void @f_agg_empty_struct()
+#[no_mangle]
+pub extern "C" fn f_agg_empty_struct(e: Empty) -> Empty {
+    e
+}
+
+#[repr(C)]
+pub struct Tiny {
+    a: u16,
+    b: u16,
+    c: u16,
+    d: u16,
+}
+
+// CHECK: define void @f_agg_tiny(i64)
+#[no_mangle]
+pub extern "C" fn f_agg_tiny(mut e: Tiny) {
+    e.a += e.b;
+    e.c += e.d;
+}
+
+// CHECK: define i64 @f_agg_tiny_ret()
+#[no_mangle]
+pub extern "C" fn f_agg_tiny_ret() -> Tiny {
+    Tiny { a: 1, b: 2, c: 3, d: 4 }
+}
+
+#[repr(C)]
+pub struct Small {
+    a: i64,
+    b: *mut i64,
+}
+
+// CHECK: define void @f_agg_small([2 x i64])
+#[no_mangle]
+pub extern "C" fn f_agg_small(mut x: Small) {
+    x.a += unsafe { *x.b };
+    x.b = &mut x.a;
+}
+
+// CHECK: define [2 x i64] @f_agg_small_ret()
+#[no_mangle]
+pub extern "C" fn f_agg_small_ret() -> Small {
+    Small { a: 1, b: core::ptr::null_mut() }
+}
+
+#[repr(C)]
+pub struct SmallAligned {
+    a: i128,
+}
+
+// CHECK: define void @f_agg_small_aligned(i128)
+#[no_mangle]
+pub extern "C" fn f_agg_small_aligned(mut x: SmallAligned) {
+    x.a += x.a;
+}
+
+#[repr(C)]
+pub struct Large {
+    a: i64,
+    b: i64,
+    c: i64,
+    d: i64,
+}
+
+// CHECK: define void @f_agg_large(%Large* {{.*}}%x)
+#[no_mangle]
+pub extern "C" fn f_agg_large(mut x: Large) {
+    x.a = x.b + x.c + x.d;
+}
+
+// CHECK: define void @f_agg_large_ret(%Large* {{.*}}sret{{.*}}, i32 signext %i, i8 signext %j)
+#[no_mangle]
+pub extern "C" fn f_agg_large_ret(i: i32, j: i8) -> Large {
+    Large { a: 1, b: 2, c: 3, d: 4 }
+}
+
+// CHECK: define void @f_scalar_stack_1(i64, [2 x i64], i128, %Large* {{.*}}%d, i8 zeroext %e, i8 signext %f, i8 %g, i8 %h)
+#[no_mangle]
+pub extern "C" fn f_scalar_stack_1(
+    a: Tiny,
+    b: Small,
+    c: SmallAligned,
+    d: Large,
+    e: u8,
+    f: i8,
+    g: u8,
+    h: i8,
+) {
+}
+
+// CHECK: define void @f_scalar_stack_2(%Large* {{.*}}sret{{.*}}, i64 %a, i128, i128, i64 %d, i8 zeroext %e, i8 %f, i8 %g)
+#[no_mangle]
+pub extern "C" fn f_scalar_stack_2(
+    a: u64,
+    b: SmallAligned,
+    c: SmallAligned,
+    d: u64,
+    e: u8,
+    f: i8,
+    g: u8,
+) -> Large {
+    Large { a: a as i64, b: e as i64, c: f as i64, d: g as i64 }
+}
+
+extern "C" {
+    fn f_va_callee(_: i32, ...) -> i32;
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn f_va_caller() {
+    // CHECK: call signext i32 (i32, ...) @f_va_callee(i32 signext 1, i32 signext 2, i64 3, double {{.*}}, double {{.*}}, i64 {{.*}}, [2 x i64] {{.*}}, i128 {{.*}}, %Large* {{.*}})
+    f_va_callee(
+        1,
+        2i32,
+        3i64,
+        4.0f64,
+        5.0f64,
+        Tiny { a: 1, b: 2, c: 3, d: 4 },
+        Small { a: 10, b: core::ptr::null_mut() },
+        SmallAligned { a: 11 },
+        Large { a: 12, b: 13, c: 14, d: 15 },
+    );
+    // CHECK: call signext i32 (i32, ...) @f_va_callee(i32 signext 1, i32 signext 2, i32 signext 3, i32 signext 4, i128 {{.*}}, i32 signext 6, i32 signext 7, i32 8, i32 9)
+    f_va_callee(1, 2i32, 3i32, 4i32, SmallAligned { a: 5 }, 6i32, 7i32, 8i32, 9i32);
+}