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From 6f680d06544edae491d2281d89b0b93efcdd6143 Mon Sep 17 00:00:00 2001
From: bors <bors@rust-lang.org>
Date: Sat, 2 Sep 2017 19:46:51 +0000
Subject: [PATCH] Auto merge of #44066 - cuviper:powerpc64-extern-abi,
r=alexcrichton
powerpc64: improve extern struct ABI
These fixes all have to do with the 64-bit PowerPC ELF ABI for big-endian
targets. The ELF v2 ABI for powerpc64le already worked well.
- Return after marking return aggregates indirect. Fixes #42757.
- Pass one-member float aggregates as direct argument values.
- Aggregate arguments less than 64-bit must be written in the least-
significant bits of the parameter space.
- Larger aggregates are instead padded at the tail.
(i.e. filling MSBs, padding the remaining LSBs.)
New tests were also added for the single-float aggregate, and a 3-byte
aggregate to check that it's filled into LSBs. Overall, at least these
formerly-failing tests now pass on powerpc64:
- run-make/extern-fn-struct-passing-abi
- run-make/extern-fn-with-packed-struct
- run-pass/extern-pass-TwoU16s.rs
- run-pass/extern-pass-TwoU8s.rs
- run-pass/struct-return.rs
---
src/librustc_trans/cabi_powerpc64.rs | 64 +++++++++++++++++-----
src/librustc_trans/cabi_x86.rs | 41 ++++++++++++--
.../run-make/extern-fn-struct-passing-abi/test.c | 32 ++++++++++-
.../run-make/extern-fn-struct-passing-abi/test.rs | 27 +++++++++
.../run-make/extern-fn-with-packed-struct/test.c | 5 ++
.../run-make/extern-fn-with-packed-struct/test.rs | 26 +--------
6 files changed, 151 insertions(+), 44 deletions(-)
diff --git a/src/librustc_trans/cabi_powerpc64.rs b/src/librustc_trans/cabi_powerpc64.rs
index c4f8d0b4b963..a3780c8cfa92 100644
--- a/src/librustc_trans/cabi_powerpc64.rs
+++ b/src/librustc_trans/cabi_powerpc64.rs
@@ -14,14 +14,26 @@
use abi::{FnType, ArgType, LayoutExt, Reg, RegKind, Uniform};
use context::CrateContext;
+use rustc::ty::layout;
-fn is_homogenous_aggregate<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>)
+#[derive(Debug, Clone, Copy, PartialEq)]
+enum ABI {
+ ELFv1, // original ABI used for powerpc64 (big-endian)
+ ELFv2, // newer ABI used for powerpc64le
+}
+use self::ABI::*;
+
+fn is_homogenous_aggregate<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
+ arg: &mut ArgType<'tcx>,
+ abi: ABI)
-> Option<Uniform> {
arg.layout.homogenous_aggregate(ccx).and_then(|unit| {
let size = arg.layout.size(ccx);
- // Ensure we have at most eight uniquely addressable members.
- if size > unit.size.checked_mul(8, ccx).unwrap() {
+ // ELFv1 only passes one-member aggregates transparently.
+ // ELFv2 passes up to eight uniquely addressable members.
+ if (abi == ELFv1 && size > unit.size)
+ || size > unit.size.checked_mul(8, ccx).unwrap() {
return None;
}
@@ -42,21 +54,23 @@ fn is_homogenous_aggregate<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut Arg
})
}
-fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>, abi: ABI) {
if !ret.layout.is_aggregate() {
ret.extend_integer_width_to(64);
return;
}
- // The PowerPC64 big endian ABI doesn't return aggregates in registers
- if ccx.sess().target.target.target_endian == "big" {
+ // The ELFv1 ABI doesn't return aggregates in registers
+ if abi == ELFv1 {
ret.make_indirect(ccx);
+ return;
}
- if let Some(uniform) = is_homogenous_aggregate(ccx, ret) {
+ if let Some(uniform) = is_homogenous_aggregate(ccx, ret, abi) {
ret.cast_to(ccx, uniform);
return;
}
+
let size = ret.layout.size(ccx);
let bits = size.bits();
if bits <= 128 {
@@ -80,31 +94,55 @@ fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tc
ret.make_indirect(ccx);
}
-fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>, abi: ABI) {
if !arg.layout.is_aggregate() {
arg.extend_integer_width_to(64);
return;
}
- if let Some(uniform) = is_homogenous_aggregate(ccx, arg) {
+ if let Some(uniform) = is_homogenous_aggregate(ccx, arg, abi) {
arg.cast_to(ccx, uniform);
return;
}
- let total = arg.layout.size(ccx);
+ let size = arg.layout.size(ccx);
+ let (unit, total) = match abi {
+ ELFv1 => {
+ // In ELFv1, aggregates smaller than a doubleword should appear in
+ // the least-significant bits of the parameter doubleword. The rest
+ // should be padded at their tail to fill out multiple doublewords.
+ if size.bits() <= 64 {
+ (Reg { kind: RegKind::Integer, size }, size)
+ } else {
+ let align = layout::Align::from_bits(64, 64).unwrap();
+ (Reg::i64(), size.abi_align(align))
+ }
+ },
+ ELFv2 => {
+ // In ELFv2, we can just cast directly.
+ (Reg::i64(), size)
+ },
+ };
+
arg.cast_to(ccx, Uniform {
- unit: Reg::i64(),
+ unit,
total
});
}
pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
+ let abi = match ccx.sess().target.target.target_endian.as_str() {
+ "big" => ELFv1,
+ "little" => ELFv2,
+ _ => unimplemented!(),
+ };
+
if !fty.ret.is_ignore() {
- classify_ret_ty(ccx, &mut fty.ret);
+ classify_ret_ty(ccx, &mut fty.ret, abi);
}
for arg in &mut fty.args {
if arg.is_ignore() { continue; }
- classify_arg_ty(ccx, arg);
+ classify_arg_ty(ccx, arg, abi);
}
}
diff --git a/src/librustc_trans/cabi_x86.rs b/src/librustc_trans/cabi_x86.rs
index 9f5520dabe33..05932ef2de80 100644
--- a/src/librustc_trans/cabi_x86.rs
+++ b/src/librustc_trans/cabi_x86.rs
@@ -11,12 +11,30 @@
use abi::{ArgAttribute, FnType, LayoutExt, Reg, RegKind};
use common::CrateContext;
+use rustc::ty::layout::{self, Layout, TyLayout};
+
#[derive(PartialEq)]
pub enum Flavor {
General,
Fastcall
}
+fn is_single_fp_element<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
+ layout: TyLayout<'tcx>) -> bool {
+ match *layout {
+ Layout::Scalar { value: layout::F32, .. } |
+ Layout::Scalar { value: layout::F64, .. } => true,
+ Layout::Univariant { .. } => {
+ if layout.field_count() == 1 {
+ is_single_fp_element(ccx, layout.field(ccx, 0))
+ } else {
+ false
+ }
+ }
+ _ => false
+ }
+}
+
pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
fty: &mut FnType<'tcx>,
flavor: Flavor) {
@@ -33,12 +51,23 @@ pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
if t.options.is_like_osx || t.options.is_like_windows
|| t.options.is_like_openbsd {
let size = fty.ret.layout.size(ccx);
- match size.bytes() {
- 1 => fty.ret.cast_to(ccx, Reg::i8()),
- 2 => fty.ret.cast_to(ccx, Reg::i16()),
- 4 => fty.ret.cast_to(ccx, Reg::i32()),
- 8 => fty.ret.cast_to(ccx, Reg::i64()),
- _ => fty.ret.make_indirect(ccx)
+
+ // According to Clang, everyone but MSVC returns single-element
+ // float aggregates directly in a floating-point register.
+ if !t.options.is_like_msvc && is_single_fp_element(ccx, fty.ret.layout) {
+ match size.bytes() {
+ 4 => fty.ret.cast_to(ccx, Reg::f32()),
+ 8 => fty.ret.cast_to(ccx, Reg::f64()),
+ _ => fty.ret.make_indirect(ccx)
+ }
+ } else {
+ match size.bytes() {
+ 1 => fty.ret.cast_to(ccx, Reg::i8()),
+ 2 => fty.ret.cast_to(ccx, Reg::i16()),
+ 4 => fty.ret.cast_to(ccx, Reg::i32()),
+ 8 => fty.ret.cast_to(ccx, Reg::i64()),
+ _ => fty.ret.make_indirect(ccx)
+ }
}
} else {
fty.ret.make_indirect(ccx);
diff --git a/src/test/run-make/extern-fn-struct-passing-abi/test.c b/src/test/run-make/extern-fn-struct-passing-abi/test.c
index 44a940a17a98..25cd6da10b8f 100644
--- a/src/test/run-make/extern-fn-struct-passing-abi/test.c
+++ b/src/test/run-make/extern-fn-struct-passing-abi/test.c
@@ -43,6 +43,16 @@ struct FloatPoint {
double y;
};
+struct FloatOne {
+ double x;
+};
+
+struct IntOdd {
+ int8_t a;
+ int8_t b;
+ int8_t c;
+};
+
// System V x86_64 ABI:
// a, b, c, d, e should be in registers
// s should be byval pointer
@@ -283,7 +293,7 @@ struct Huge huge_struct(struct Huge s) {
// p should be in registers
// return should be in registers
//
-// Win64 ABI:
+// Win64 ABI and 64-bit PowerPC ELFv1 ABI:
// p should be a byval pointer
// return should be in a hidden sret pointer
struct FloatPoint float_point(struct FloatPoint p) {
@@ -292,3 +302,23 @@ struct FloatPoint float_point(struct FloatPoint p) {
return p;
}
+
+// 64-bit PowerPC ELFv1 ABI:
+// f1 should be in a register
+// return should be in a hidden sret pointer
+struct FloatOne float_one(struct FloatOne f1) {
+ assert(f1.x == 7.);
+
+ return f1;
+}
+
+// 64-bit PowerPC ELFv1 ABI:
+// i should be in the least-significant bits of a register
+// return should be in a hidden sret pointer
+struct IntOdd int_odd(struct IntOdd i) {
+ assert(i.a == 1);
+ assert(i.b == 2);
+ assert(i.c == 3);
+
+ return i;
+}
diff --git a/src/test/run-make/extern-fn-struct-passing-abi/test.rs b/src/test/run-make/extern-fn-struct-passing-abi/test.rs
index aaae7ae4fb49..54a4f868eb4e 100644
--- a/src/test/run-make/extern-fn-struct-passing-abi/test.rs
+++ b/src/test/run-make/extern-fn-struct-passing-abi/test.rs
@@ -53,6 +53,20 @@ struct FloatPoint {
y: f64
}
+#[derive(Clone, Copy, Debug, PartialEq)]
+#[repr(C)]
+struct FloatOne {
+ x: f64,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+#[repr(C)]
+struct IntOdd {
+ a: i8,
+ b: i8,
+ c: i8,
+}
+
#[link(name = "test", kind = "static")]
extern {
fn byval_rect(a: i32, b: i32, c: i32, d: i32, e: i32, s: Rect);
@@ -83,6 +97,10 @@ extern {
fn huge_struct(s: Huge) -> Huge;
fn float_point(p: FloatPoint) -> FloatPoint;
+
+ fn float_one(f: FloatOne) -> FloatOne;
+
+ fn int_odd(i: IntOdd) -> IntOdd;
}
fn main() {
@@ -91,6 +109,8 @@ fn main() {
let u = FloatRect { a: 3489, b: 3490, c: 8. };
let v = Huge { a: 5647, b: 5648, c: 5649, d: 5650, e: 5651 };
let p = FloatPoint { x: 5., y: -3. };
+ let f1 = FloatOne { x: 7. };
+ let i = IntOdd { a: 1, b: 2, c: 3 };
unsafe {
byval_rect(1, 2, 3, 4, 5, s);
@@ -113,5 +133,12 @@ fn main() {
assert_eq!(sret_byval_struct(1, 2, 3, 4, s), t);
assert_eq!(sret_split_struct(1, 2, s), t);
assert_eq!(float_point(p), p);
+ assert_eq!(int_odd(i), i);
+
+ // MSVC/GCC/Clang are not consistent in the ABI of single-float aggregates.
+ // x86_64: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82028
+ // i686: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82041
+ #[cfg(not(all(windows, target_env = "gnu")))]
+ assert_eq!(float_one(f1), f1);
}
}
diff --git a/src/test/run-make/extern-fn-with-packed-struct/test.c b/src/test/run-make/extern-fn-with-packed-struct/test.c
index 506954fca461..4124e202c1dd 100644
--- a/src/test/run-make/extern-fn-with-packed-struct/test.c
+++ b/src/test/run-make/extern-fn-with-packed-struct/test.c
@@ -1,6 +1,8 @@
// ignore-license
// Pragma needed cause of gcc bug on windows: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52991
+#include <assert.h>
+
#ifdef _MSC_VER
#pragma pack(push,1)
struct Foo {
@@ -18,5 +20,8 @@ struct __attribute__((packed)) Foo {
#endif
struct Foo foo(struct Foo foo) {
+ assert(foo.a == 1);
+ assert(foo.b == 2);
+ assert(foo.c == 3);
return foo;
}
diff --git a/src/test/run-make/extern-fn-with-packed-struct/test.rs b/src/test/run-make/extern-fn-with-packed-struct/test.rs
index 9e81636e3670..d2540ad61542 100644
--- a/src/test/run-make/extern-fn-with-packed-struct/test.rs
+++ b/src/test/run-make/extern-fn-with-packed-struct/test.rs
@@ -8,36 +8,14 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
-use std::fmt;
-
-#[repr(packed)]
-#[derive(Copy, Clone)]
+#[repr(C, packed)]
+#[derive(Copy, Clone, Debug, PartialEq)]
struct Foo {
a: i8,
b: i16,
c: i8
}
-impl PartialEq for Foo {
- fn eq(&self, other: &Foo) -> bool {
- self.a == other.a && self.b == other.b && self.c == other.c
- }
-}
-
-impl fmt::Debug for Foo {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- let a = self.a;
- let b = self.b;
- let c = self.c;
-
- f.debug_struct("Foo")
- .field("a", &a)
- .field("b", &b)
- .field("c", &c)
- .finish()
- }
-}
-
#[link(name = "test", kind = "static")]
extern {
fn foo(f: Foo) -> Foo;
--
2.13.5
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