Add support for specifying multiple clobber_abi in `asm!` #89316

asquared31415 · 2021-09-28T01:51:19Z

r? @Amanieu
cc #72016
@rustbot label: +A-inline-assembly +F-asm

asquared31415 · 2021-09-28T01:52:30Z

One concern I have is the increase of the size of ast::ItemKind, if that is a problem I think that it can be fixed with some boxed slices?

Amanieu · 2021-09-29T03:42:53Z

compiler/rustc_ast/src/ast.rs

@@ -2744,7 +2744,7 @@ pub enum ItemKind {
 }

 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-rustc_data_structures::static_assert_size!(ItemKind, 112);


Consider boxing the InlineAsm to avoid increasing the size of ItemKind.

Amanieu · 2021-09-29T03:45:05Z

compiler/rustc_ast_lowering/src/asm.rs

@@ -27,11 +28,13 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                .emit();
        }

-        let mut clobber_abi = None;
+        let mut clobber_abis = FxHashSet::default();


Use a HashMap keyed on the ABI, otherwise 2 identical ABIs with different spans will both be included.

compiler/rustc_ast_lowering/src/asm.rs

Amanieu · 2021-09-29T03:47:58Z

compiler/rustc_builtin_macros/src/asm.rs

@@ -210,7 +210,7 @@ fn parse_args<'a>(
                .span_labels(args.options_spans.clone(), "previous options")
                .span_label(span, "argument")
                .emit();
-        } else if let Some((_, abi_span)) = args.clobber_abi {
+        } else if let Some(&(_, abi_span)) = args.clobber_abis.last() {
            ecx.struct_span_err(span, "arguments are not allowed after clobber_abi")
                .span_label(abi_span, "clobber_abi")


I'd like this to point to all the clobber_abi spans, not just the last one.

Amanieu · 2021-09-29T03:48:13Z

compiler/rustc_builtin_macros/src/asm.rs

@@ -322,7 +322,7 @@ fn parse_args<'a>(
        // Bail out now since this is likely to confuse MIR
        return Err(err);
    }
-    if let Some((_, abi_span)) = args.clobber_abi {
+    if let Some(&(_, abi_span)) = args.clobber_abis.last() {
        if is_global_asm {
            let err =
                ecx.struct_span_err(abi_span, "`clobber_abi` cannot be used with `global_asm!`");


Amanieu · 2021-09-29T16:50:33Z

Can you add this to grammar in the asm documentation in the unstable book? Also in the reference-level explanation add a note saying that clobber_abi can be specified multiple times.

Amanieu · 2021-09-30T06:09:01Z

@bors r+

bors · 2021-09-30T06:09:03Z

📌 Commit b159d95 has been approved by Amanieu

… r=Amanieu Add support for specifying multiple clobber_abi in `asm!` r? `@Amanieu` cc rust-lang#72016 `@rustbot` label: +A-inline-assembly +F-asm

fee1-dead · 2021-10-01T17:08:04Z

@bors r-

Failed in #89420 (comment)

nbdd0121

I wonder if the syntax should be

clobber_abi("A"), clobber_abi("B")

or

clobber_abi("A", "B")

nbdd0121 · 2021-10-06T21:13:28Z

compiler/rustc_builtin_macros/src/asm.rs

@@ -322,10 +322,12 @@ fn parse_args<'a>(
        // Bail out now since this is likely to confuse MIR
        return Err(err);
    }
-    if let Some((_, abi_span)) = args.clobber_abi {
+    if args.clobber_abis.len() > 0 {


Suggested change

if args.clobber_abis.len() > 0 {

if !args.clobber_abis.is_empty() {

Amanieu · 2021-10-07T08:11:10Z

Hmm actually I slightly prefer clobber_abi("A", "B").

asquared31415 · 2021-10-08T00:27:01Z

I like that syntax better too

nbdd0121 · 2021-10-08T22:30:54Z

compiler/rustc_ast_lowering/src/asm.rs

+                            let mut abis = format!("`{}`", supported_abis[0]);
+                            for m in &supported_abis[1..] {
+                                let _ = write!(abis, ", `{}`", m);
+                            }


Suggested change

let mut abis = format!("`{}`", supported_abis[0]);

for m in &supported_abis[1..] {

let _ = write!(abis, ", `{}`", m);

}

let abis = supported_abis.join(",");

The code there adds ` around the abi name, which can't be replicated using just join like that.

nbdd0121 · 2021-10-08T22:32:29Z

compiler/rustc_ast_lowering/src/asm.rs

@@ -27,31 +28,36 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                .emit();
        }

-        let mut clobber_abi = None;
+        let mut clobber_abis = FxHashMap::default();


I think this shall be a Vec. If there are multiple occurrence of the same ABI then it should be error (and emitted during macro expansion), not silently merged.

nbdd0121 · 2021-10-08T22:33:36Z

compiler/rustc_ast_pretty/src/pprust/state.rs

-            args.push(AsmArg::ClobberAbi(abi));
+        if let Some((_, abis)) = &asm.clobber_abis {
+            for (abi, _) in abis {
+                args.push(AsmArg::ClobberAbi(*abi));


Wouldn't this still geenrate multiple clobber_abis?

nbdd0121 · 2021-10-08T22:37:34Z

compiler/rustc_builtin_macros/src/asm.rs

+                new_abis.push((str_lit.symbol_unescaped, str_lit.span));
+            }
+            Err(opt_lit) => {
+                // A closing paren is only allowed after a comma, so make sure we've seen an abi before, or else there's a missing abi argument


I think it's best to treat non-string-literal case and no ABI specified case separately (given that this is now a comma delimited list), so if the user writes clobber_abi() then we should say "at least an ABI name should be specified in clobber_abi" rather than just "expected string literal".

Amanieu · 2021-10-10T15:45:39Z

@bors r+

bors · 2021-10-10T15:45:40Z

📌 Commit 111423454809b548c7d8ad195d100046d99dcd98 has been approved by Amanieu

bors · 2021-10-10T22:01:47Z

⌛ Testing commit 111423454809b548c7d8ad195d100046d99dcd98 with merge f1b081eb34e3a1756703a5cd7884ae8132eb52ef...

Allow multiple clobber_abi in asm Update docs Fix aarch64 test Combine abis Emit duplicate ABI error, empty ABI list error multiple clobber_abi

Amanieu · 2021-11-10T10:16:57Z

@bors r+

bors · 2021-11-10T10:16:58Z

📌 Commit 3e799e4 has been approved by Amanieu

bors · 2021-11-10T12:32:45Z

⌛ Testing commit 3e799e4 with merge 4de694226be8edf717148c78451fac31fb9ff4f5...

bors · 2021-11-10T12:56:24Z

💔 Test failed - checks-actions

Amanieu · 2021-11-12T15:37:42Z

@bors r+

bors · 2021-11-12T15:37:43Z

📌 Commit e80f300 has been approved by Amanieu

bors · 2021-11-12T16:29:28Z

⌛ Testing commit e80f300 with merge 220ed09...

bors · 2021-11-12T19:27:58Z

☀️ Test successful - checks-actions
Approved by: Amanieu
Pushing 220ed09 to master...

rust-timer · 2021-11-12T20:59:51Z

Finished benchmarking commit (220ed09): comparison url.

Summary: This benchmark run did not return any relevant changes.

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

rustbot added A-inline-assembly Area: Inline assembly (`asm!(…)`) F-asm `#![feature(asm)]` (not `llvm_asm`) labels Sep 28, 2021

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asquared31415 force-pushed the multiple-clobber-abi branch from 77726da to db8af3f Compare September 28, 2021 02:17

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fee1-dead mentioned this pull request Oct 1, 2021

Rollup of 8 pull requests #89420

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asquared31415 force-pushed the multiple-clobber-abi branch from 5625ff6 to 1114234 Compare October 9, 2021 02:45

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asquared31415 added 3 commits November 10, 2021 01:06

Add support for specifying multiple clobber_abi in asm!

b233d3b

Allow multiple clobber_abi in asm Update docs Fix aarch64 test Combine abis Emit duplicate ABI error, empty ABI list error multiple clobber_abi

Fix aarch tests

f3e42cb

add missing sym feature

3e799e4

asquared31415 force-pushed the multiple-clobber-abi branch from c77cd0a to 3e799e4 Compare November 10, 2021 06:36

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fix aarch test error annotations

e80f300

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Nov 12, 2021

bors added the merged-by-bors This PR was explicitly merged by bors. label Nov 12, 2021

bors merged commit 220ed09 into rust-lang:master Nov 12, 2021

rustbot added this to the 1.58.0 milestone Nov 12, 2021

asquared31415 deleted the multiple-clobber-abi branch November 18, 2021 17:58

asquared31415 mentioned this pull request Jun 15, 2023

ice: asm: unreachable #112635

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Add support for specifying multiple clobber_abi in `asm!` #89316

Add support for specifying multiple clobber_abi in `asm!` #89316

asquared31415 commented Sep 28, 2021

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	if args.clobber_abis.len() > 0 {
	if !args.clobber_abis.is_empty() {

Add support for specifying multiple clobber_abi in asm! #89316

Add support for specifying multiple clobber_abi in asm! #89316

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Add support for specifying multiple clobber_abi in `asm!` #89316

Add support for specifying multiple clobber_abi in `asm!` #89316

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