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0c157b51d3
For aarch64-apple and aarch64-windows, platform docs state that code
must use frame pointers correctly. This is because the AAPCS64 mandates
that a platform specify its frame pointer conformance requirements:
- Apple: https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms#Respect-the-purpose-of-specific-CPU-registers
- Windows: https://learn.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=msvc-170#integer-registers
- AAPCS64: 4492d1570e/aapcs64/aapcs64.rst (the-frame-pointer)
Unwinding code either requires unwind tables or frame pointers, and
on aarch64 the expectation is that one can use frame pointers for this.
Most Linux targets represent a motley variety of possible distributions,
so it is unclear who to defer to on conformance, other than perhaps Arm.
In the absence of a specific edict for a given aarch64-linux target,
Rust will assume aarch64-linux targets use non-leaf frame pointers.
This reflects what compilers like clang do.
36 lines
1.2 KiB
Rust
36 lines
1.2 KiB
Rust
//@ add-core-stubs
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//@ compile-flags: --crate-type=rlib -Copt-level=0
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//@ revisions: aarch64-apple aarch64-linux force x64-apple x64-linux
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//@ [aarch64-apple] needs-llvm-components: aarch64
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//@ [aarch64-apple] compile-flags: --target=aarch64-apple-darwin
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//@ [aarch64-linux] needs-llvm-components: aarch64
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//@ [aarch64-linux] compile-flags: --target=aarch64-unknown-linux-gnu
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//@ [force] needs-llvm-components: x86
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//@ [force] compile-flags: --target=x86_64-unknown-linux-gnu -Cforce-frame-pointers=yes
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//@ [x64-apple] needs-llvm-components: x86
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//@ [x64-apple] compile-flags: --target=x86_64-apple-darwin
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//@ [x64-linux] needs-llvm-components: x86
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//@ [x64-linux] compile-flags: --target=x86_64-unknown-linux-gnu
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#![feature(no_core, lang_items)]
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#![no_core]
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extern crate minicore;
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use minicore::*;
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// CHECK: define i32 @peach{{.*}}[[PEACH_ATTRS:\#[0-9]+]] {
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#[no_mangle]
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pub fn peach(x: u32) -> u32 {
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x
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}
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// CHECK: attributes [[PEACH_ATTRS]] = {
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// x64-linux-NOT: {{.*}}"frame-pointer"{{.*}}
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// x64-apple-SAME: {{.*}}"frame-pointer"="all"
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// force-SAME: {{.*}}"frame-pointer"="all"
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//
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// AAPCS64 demands frame pointers:
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// aarch64-linux-SAME: {{.*}}"frame-pointer"="non-leaf"
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// aarch64-apple-SAME: {{.*}}"frame-pointer"="non-leaf"
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// CHECK-SAME: }
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