Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/compiler/rustc_target/src/abi/call/avr.rs b/compiler/rustc_target/src/abi/call/avr.rs
new file mode 100644
index 000000000..c1f7a1e3a
--- /dev/null
+++ b/compiler/rustc_target/src/abi/call/avr.rs
@@ -0,0 +1,59 @@
+//! LLVM-frontend specific AVR calling convention implementation.
+//!
+//! # Current calling convention ABI
+//!
+//! Inherited from Clang's `clang::DefaultABIInfo` implementation - self described
+//! as
+//!
+//! > the default implementation for ABI specific details. This implementation
+//! > provides information which results in
+//! > self-consistent and sensible LLVM IR generation, but does not
+//! > conform to any particular ABI.
+//! >
+//! > - Doxygen Doxumentation of `clang::DefaultABIInfo`
+//!
+//! This calling convention may not match AVR-GCC in all cases.
+//!
+//! In the future, an AVR-GCC compatible argument classification ABI should be
+//! adopted in both Rust and Clang.
+//!
+//! *NOTE*: Currently, this module implements the same calling convention
+//! that clang with AVR currently does - the default, simple, unspecialized
+//! ABI implementation available to all targets. This ABI is not
+//! binary-compatible with AVR-GCC. Once LLVM [PR46140](https://bugs.llvm.org/show_bug.cgi?id=46140)
+//! is completed, this module should be updated to match so that both Clang
+//! and Rust emit code to the same AVR-GCC compatible ABI.
+//!
+//! In particular, both Clang and Rust may not have the same semantics
+//! when promoting arguments to indirect references as AVR-GCC. It is important
+//! to note that the core AVR ABI implementation within LLVM itself is ABI
+//! compatible with AVR-GCC - Rust and AVR-GCC only differ in the small amount
+//! of compiler frontend specific calling convention logic implemented here.
+
+use crate::abi::call::{ArgAbi, FnAbi};
+
+fn classify_ret_ty<Ty>(ret: &mut ArgAbi<'_, Ty>) {
+    if ret.layout.is_aggregate() {
+        ret.make_indirect();
+    }
+}
+
+fn classify_arg_ty<Ty>(arg: &mut ArgAbi<'_, Ty>) {
+    if arg.layout.is_aggregate() {
+        arg.make_indirect();
+    }
+}
+
+pub fn compute_abi_info<Ty>(fty: &mut FnAbi<'_, Ty>) {
+    if !fty.ret.is_ignore() {
+        classify_ret_ty(&mut fty.ret);
+    }
+
+    for arg in &mut fty.args {
+        if arg.is_ignore() {
+            continue;
+        }
+
+        classify_arg_ty(arg);
+    }
+}