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Add support for specifying multiple clobber_abi in asm!

Browse Source 
Allow multiple clobber_abi in asm

Update docs
Fix aarch64 test
Combine abis
Emit duplicate ABI error, empty ABI list error
multiple clobber_abi
This commit is contained in:
asquared31415 2021-10-14 03:23:09 -04:00
parent 214cd1f228
commit b233d3b5da
14 changed files with 370 additions and 147 deletions
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4
compiler/rustc_ast/src/ast.rs
View File

@ -2058,7 +2058,7 @@ pub struct InlineAsm {
pub template: Vec<InlineAsmTemplatePiece>,
pub template_strs: Box<[(Symbol, Option<Symbol>, Span)]>,
pub operands: Vec<(InlineAsmOperand, Span)>,
pub clobber_abi: Option<(Symbol, Span)>,
pub clobber_abis: Vec<(Symbol, Span)>,
pub options: InlineAsmOptions,
pub line_spans: Vec<Span>,
}
@ -2715,7 +2715,7 @@ pub enum ItemKind {
/// E.g., `extern {}` or `extern "C" {}`.
ForeignMod(ForeignMod),
/// Module-level inline assembly (from `global_asm!()`).
GlobalAsm(InlineAsm),
GlobalAsm(Box<InlineAsm>),
/// A type alias (`type`).
///
/// E.g., `type Foo = Bar<u8>;`.

47
compiler/rustc_ast_lowering/src/asm.rs
View File

@ -2,6 +2,7 @@ use super::LoweringContext;
use rustc_ast::*;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::stable_set::FxHashSet;
use rustc_errors::struct_span_err;
use rustc_hir as hir;
use rustc_session::parse::feature_err;
@ -49,22 +50,47 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
.emit();
}
let mut clobber_abi = None;
let mut clobber_abis = FxHashMap::default();
if let Some(asm_arch) = asm_arch {
if let Some((abi_name, abi_span)) = asm.clobber_abi {
match asm::InlineAsmClobberAbi::parse(asm_arch, &self.sess.target, abi_name) {
Ok(abi) => clobber_abi = Some((abi, abi_span)),
for (abi_name, abi_span) in &asm.clobber_abis {
match asm::InlineAsmClobberAbi::parse(asm_arch, &self.sess.target, *abi_name) {
Ok(abi) => {
// If the abi was already in the list, emit an error
match clobber_abis.get(&abi) {
Some((prev_name, prev_sp)) => {
let mut err = self.sess.struct_span_err(
*abi_span,
&format!("`{}` ABI specified multiple times", prev_name),
);
err.span_label(*prev_sp, "previously specified here");
// Multiple different abi names may actually be the same ABI
// If the specified ABIs are not the same name, alert the user that they resolve to the same ABI
let source_map = self.sess.source_map();
if source_map.span_to_snippet(*prev_sp)
!= source_map.span_to_snippet(*abi_span)
{
err.note("these ABIs are equivalent on the current target");
}
err.emit();
}
None => {
clobber_abis.insert(abi, (abi_name, *abi_span));
}
}
}
Err(&[]) => {
self.sess
.struct_span_err(
abi_span,
*abi_span,
"`clobber_abi` is not supported on this target",
)
.emit();
}
Err(supported_abis) => {
let mut err =
self.sess.struct_span_err(abi_span, "invalid ABI for `clobber_abi`");
self.sess.struct_span_err(*abi_span, "invalid ABI for `clobber_abi`");
let mut abis = format!("`{}`", supported_abis[0]);
for m in &supported_abis[1..] {
let _ = write!(abis, ", `{}`", m);
@ -348,8 +374,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// If a clobber_abi is specified, add the necessary clobbers to the
// operands list.
if let Some((abi, abi_span)) = clobber_abi {
let mut clobbered = FxHashSet::default();
for (abi, (_, abi_span)) in clobber_abis {
for &clobber in abi.clobbered_regs() {
// Don't emit a clobber for a register already clobbered
if clobbered.contains(&clobber) {
continue;
}
let mut output_used = false;
clobber.overlapping_regs(|reg| {
if used_output_regs.contains_key(&reg) {
@ -366,6 +398,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
},
self.lower_span(abi_span),
));
clobbered.insert(clobber);
}
}
}

4
compiler/rustc_ast_pretty/src/pprust/state.rs
View File

@ -2235,8 +2235,8 @@ impl<'a> State<'a> {
let mut args = vec![AsmArg::Template(InlineAsmTemplatePiece::to_string(&asm.template))];
args.extend(asm.operands.iter().map(|(o, _)| AsmArg::Operand(o)));
if let Some((abi, _)) = asm.clobber_abi {
args.push(AsmArg::ClobberAbi(abi));
for (abi, _) in &asm.clobber_abis {
args.push(AsmArg::ClobberAbi(*abi));
}
if !asm.options.is_empty() {
args.push(AsmArg::Options(asm.options));

96
compiler/rustc_builtin_macros/src/asm.rs
View File

@ -19,7 +19,7 @@ struct AsmArgs {
operands: Vec<(ast::InlineAsmOperand, Span)>,
named_args: FxHashMap<Symbol, usize>,
reg_args: FxHashSet<usize>,
clobber_abi: Option<(Symbol, Span)>,
clobber_abis: Vec<(Symbol, Span)>,
options: ast::InlineAsmOptions,
options_spans: Vec<Span>,
}
@ -64,7 +64,7 @@ fn parse_args<'a>(
operands: vec![],
named_args: FxHashMap::default(),
reg_args: FxHashSet::default(),
clobber_abi: None,
clobber_abis: Vec::new(),
options: ast::InlineAsmOptions::empty(),
options_spans: vec![],
};
@ -210,9 +210,9 @@ 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")
.span_label(*abi_span, "clobber_abi")
.span_label(span, "argument")
.emit();
}
@ -322,10 +322,13 @@ 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 {
if is_global_asm {
let err =
ecx.struct_span_err(abi_span, "`clobber_abi` cannot be used with `global_asm!`");
let err = ecx.struct_span_err(
args.clobber_abis.iter().map(|(_, span)| *span).collect::<Vec<Span>>(),
"`clobber_abi` cannot be used with `global_asm!`",
);
// Bail out now since this is likely to confuse later stages
return Err(err);
@ -335,7 +338,10 @@ fn parse_args<'a>(
regclass_outputs.clone(),
"asm with `clobber_abi` must specify explicit registers for outputs",
)
.span_label(abi_span, "clobber_abi")
.span_labels(
args.clobber_abis.iter().map(|(_, span)| *span).collect::<Vec<Span>>(),
"clobber_abi",
)
.span_labels(regclass_outputs, "generic outputs")
.emit();
}
@ -439,37 +445,61 @@ fn parse_clobber_abi<'a>(
p.expect(&token::OpenDelim(token::DelimToken::Paren))?;
let clobber_abi = match p.parse_str_lit() {
Ok(str_lit) => str_lit.symbol_unescaped,
Err(opt_lit) => {
let span = opt_lit.map_or(p.token.span, |lit| lit.span);
let mut err = p.sess.span_diagnostic.struct_span_err(span, "expected string literal");
err.span_label(span, "not a string literal");
return Err(err);
}
};
p.expect(&token::CloseDelim(token::DelimToken::Paren))?;
let new_span = span_start.to(p.prev_token.span);
if let Some((_, prev_span)) = args.clobber_abi {
let mut err = p
.sess
.span_diagnostic
.struct_span_err(new_span, "clobber_abi specified multiple times");
err.span_label(prev_span, "clobber_abi previously specified here");
if p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
let err = p.sess.span_diagnostic.struct_span_err(
p.token.span,
"at least one abi must be provided as an argument to `clobber_abi`",
);
return Err(err);
} else if !args.options_spans.is_empty() {
}
let mut new_abis = Vec::new();
loop {
match p.parse_str_lit() {
Ok(str_lit) => {
new_abis.push((str_lit.symbol_unescaped, str_lit.span));
}
Err(opt_lit) => {
// If the non-string literal is a closing paren then it's the end of the list and is fine
if p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
break;
}
let span = opt_lit.map_or(p.token.span, |lit| lit.span);
let mut err =
p.sess.span_diagnostic.struct_span_err(span, "expected string literal");
err.span_label(span, "not a string literal");
return Err(err);
}
};
// Allow trailing commas
if p.eat(&token::CloseDelim(token::DelimToken::Paren)) {
break;
}
p.expect(&token::Comma)?;
}
let full_span = span_start.to(p.prev_token.span);
if !args.options_spans.is_empty() {
let mut err = p
.sess
.span_diagnostic
.struct_span_err(new_span, "clobber_abi is not allowed after options");
.struct_span_err(full_span, "clobber_abi is not allowed after options");
err.span_labels(args.options_spans.clone(), "options");
return Err(err);
}
args.clobber_abi = Some((clobber_abi, new_span));
match &new_abis[..] {
// should have errored above during parsing
[] => unreachable!(),
[(abi, _span)] => args.clobber_abis.push((*abi, full_span)),
[abis @ ..] => {
for (abi, span) in abis {
args.clobber_abis.push((*abi, *span));
}
}
}
Ok(())
}
@ -770,7 +800,7 @@ fn expand_preparsed_asm(ecx: &mut ExtCtxt<'_>, args: AsmArgs) -> Option<ast::Inl
template,
template_strs: template_strs.into_boxed_slice(),
operands: args.operands,
clobber_abi: args.clobber_abi,
clobber_abis: args.clobber_abis,
options: args.options,
line_spans,
})
@ -815,7 +845,7 @@ pub fn expand_global_asm<'cx>(
ident: Ident::empty(),
attrs: Vec::new(),
id: ast::DUMMY_NODE_ID,
kind: ast::ItemKind::GlobalAsm(inline_asm),
kind: ast::ItemKind::GlobalAsm(Box::new(inline_asm)),
vis: ast::Visibility {
span: sp.shrink_to_lo(),
kind: ast::VisibilityKind::Inherited,

8
src/doc/unstable-book/src/library-features/asm.md
View File

@ -319,7 +319,7 @@ fn call_foo(arg: i32) -> i32 {
Note that the `fn` or `static` item does not need to be public or `#[no_mangle]`: the compiler will automatically insert the appropriate mangled symbol name into the assembly code.
By default, `asm!` assumes that any register not specified as an output will have its contents preserved by the assembly code. The [`clobber_abi`](#abi-clobbers) argument to `asm!` tells the compiler to automatically insert the necessary clobber operands according to the given calling convention ABI: any register which is not fully preserved in that ABI will be treated as clobbered.
By default, `asm!` assumes that any register not specified as an output will have its contents preserved by the assembly code. The [`clobber_abi`](#abi-clobbers) argument to `asm!` tells the compiler to automatically insert the necessary clobber operands according to the given calling convention ABI: any register which is not fully preserved in that ABI will be treated as clobbered. Multiple `clobber_abi` arguments may be provided and all clobbers from all specified ABIs will be inserted.
## Register template modifiers
@ -453,10 +453,10 @@ reg_spec := <register class> / "<explicit register>"
operand_expr := expr / "_" / expr "=>" expr / expr "=>" "_"
reg_operand := dir_spec "(" reg_spec ")" operand_expr
operand := reg_operand / "const" const_expr / "sym" path
clobber_abi := "clobber_abi(" <abi> ")"
clobber_abi := "clobber_abi(" <abi> *["," <abi>] [","] ")"
option := "pure" / "nomem" / "readonly" / "preserves_flags" / "noreturn" / "nostack" / "att_syntax" / "raw"
options := "options(" option *["," option] [","] ")"
asm := "asm!(" format_string *("," format_string) *("," [ident "="] operand) ["," clobber_abi] *("," options) [","] ")"
asm := "asm!(" format_string *("," format_string) *("," [ident "="] operand) *("," clobber_abi) *("," options) [","] ")"
```
Inline assembly is currently supported on the following architectures:
@ -799,6 +799,8 @@ As stated in the previous section, passing an input value smaller than the regis
The `clobber_abi` keyword can be used to apply a default set of clobbers to an `asm` block. This will automatically insert the necessary clobber constraints as needed for calling a function with a particular calling convention: if the calling convention does not fully preserve the value of a register across a call then a `lateout("reg") _` is implicitly added to the operands list.
`clobber_abi` may be specified any number of times. It will insert a clobber for all unique registers in the union of all specified calling conventions.
Generic register class outputs are disallowed by the compiler when `clobber_abi` is used: all outputs must specify an explicit register. Explicit register outputs have precedence over the implicit clobbers inserted by `clobber_abi`: a clobber will only be inserted for a register if that register is not used as an output.
The following ABIs can be used with `clobber_abi`:

3
src/test/ui/asm/aarch64/parse-error.rs
View File

@ -51,7 +51,6 @@ fn main() {
asm!("{}", options(), clobber_abi("C"), const foo);
//~^ ERROR clobber_abi is not allowed after options
asm!("", clobber_abi("C"), clobber_abi("C"));
//~^ ERROR clobber_abi specified multiple times
asm!("{a}", a = const foo, a = const bar);
//~^ ERROR duplicate argument named `a`
//~^^ ERROR argument never used
@ -121,7 +120,7 @@ global_asm!("", options(), clobber_abi("C"));
global_asm!("{}", options(), clobber_abi("C"), const FOO);
//~^ ERROR clobber_abi is not allowed after options
global_asm!("", clobber_abi("C"), clobber_abi("C"));
//~^ ERROR clobber_abi specified multiple times
//~^ ERROR `clobber_abi` cannot be used with `global_asm!`
global_asm!("{a}", a = const FOO, a = const BAR);
//~^ ERROR duplicate argument named `a`
//~^^ ERROR argument never used

100
src/test/ui/asm/aarch64/parse-error.stderr
View File

@ -132,16 +132,8 @@ LL | asm!("{}", options(), clobber_abi("C"), const foo);
| |
| options
error: clobber_abi specified multiple times
--> $DIR/parse-error.rs:53:36
|
LL | asm!("", clobber_abi("C"), clobber_abi("C"));
| ---------------- ^^^^^^^^^^^^^^^^
| |
| clobber_abi previously specified here
error: duplicate argument named `a`
--> $DIR/parse-error.rs:55:36
--> $DIR/parse-error.rs:54:36
|
LL | asm!("{a}", a = const foo, a = const bar);
| ------------- ^^^^^^^^^^^^^ duplicate argument
@ -149,7 +141,7 @@ LL | asm!("{a}", a = const foo, a = const bar);
| previously here
error: argument never used
--> $DIR/parse-error.rs:55:36
--> $DIR/parse-error.rs:54:36
|
LL | asm!("{a}", a = const foo, a = const bar);
| ^^^^^^^^^^^^^ argument never used
@ -157,13 +149,13 @@ LL | asm!("{a}", a = const foo, a = const bar);
= help: if this argument is intentionally unused, consider using it in an asm comment: `"/* {1} */"`
error: explicit register arguments cannot have names
--> $DIR/parse-error.rs:60:18
--> $DIR/parse-error.rs:59:18
|
LL | asm!("", a = in("x0") foo);
| ^^^^^^^^^^^^^^^^
error: named arguments cannot follow explicit register arguments
--> $DIR/parse-error.rs:62:35
--> $DIR/parse-error.rs:61:35
|
LL | asm!("{a}", in("x0") foo, a = const bar);
| ------------ ^^^^^^^^^^^^^ named argument
@ -171,7 +163,7 @@ LL | asm!("{a}", in("x0") foo, a = const bar);
| explicit register argument
error: named arguments cannot follow explicit register arguments
--> $DIR/parse-error.rs:65:35
--> $DIR/parse-error.rs:64:35
|
LL | asm!("{a}", in("x0") foo, a = const bar);
| ------------ ^^^^^^^^^^^^^ named argument
@ -179,7 +171,7 @@ LL | asm!("{a}", in("x0") foo, a = const bar);
| explicit register argument
error: positional arguments cannot follow named arguments or explicit register arguments
--> $DIR/parse-error.rs:68:35
--> $DIR/parse-error.rs:67:35
|
LL | asm!("{1}", in("x0") foo, const bar);
| ------------ ^^^^^^^^^ positional argument
@ -187,19 +179,19 @@ LL | asm!("{1}", in("x0") foo, const bar);
| explicit register argument
error: expected one of `clobber_abi`, `const`, `in`, `inlateout`, `inout`, `lateout`, `options`, `out`, or `sym`, found `""`
--> $DIR/parse-error.rs:71:29
--> $DIR/parse-error.rs:70:29
|
LL | asm!("", options(), "");
| ^^ expected one of 9 possible tokens
error: expected one of `clobber_abi`, `const`, `in`, `inlateout`, `inout`, `lateout`, `options`, `out`, or `sym`, found `"{}"`
--> $DIR/parse-error.rs:73:33
--> $DIR/parse-error.rs:72:33
|
LL | asm!("{}", in(reg) foo, "{}", out(reg) foo);
| ^^^^ expected one of 9 possible tokens
error: asm template must be a string literal
--> $DIR/parse-error.rs:75:14
--> $DIR/parse-error.rs:74:14
|
LL | asm!(format!("{{{}}}", 0), in(reg) foo);
| ^^^^^^^^^^^^^^^^^^^^
@ -207,7 +199,7 @@ LL | asm!(format!("{{{}}}", 0), in(reg) foo);
= note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
error: asm template must be a string literal
--> $DIR/parse-error.rs:77:21
--> $DIR/parse-error.rs:76:21
|
LL | asm!("{1}", format!("{{{}}}", 0), in(reg) foo, out(reg) bar);
| ^^^^^^^^^^^^^^^^^^^^
@ -215,79 +207,79 @@ LL | asm!("{1}", format!("{{{}}}", 0), in(reg) foo, out(reg) bar);
= note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
error: _ cannot be used for input operands
--> $DIR/parse-error.rs:79:28
--> $DIR/parse-error.rs:78:28
|
LL | asm!("{}", in(reg) _);
| ^
error: _ cannot be used for input operands
--> $DIR/parse-error.rs:81:31
--> $DIR/parse-error.rs:80:31
|
LL | asm!("{}", inout(reg) _);
| ^
error: _ cannot be used for input operands
--> $DIR/parse-error.rs:83:35
--> $DIR/parse-error.rs:82:35
|
LL | asm!("{}", inlateout(reg) _);
| ^
error: requires at least a template string argument
--> $DIR/parse-error.rs:90:1
--> $DIR/parse-error.rs:89:1
|
LL | global_asm!();
| ^^^^^^^^^^^^^
error: asm template must be a string literal
--> $DIR/parse-error.rs:92:13
--> $DIR/parse-error.rs:91:13
|
LL | global_asm!(FOO);
| ^^^
error: expected token: `,`
--> $DIR/parse-error.rs:94:18
--> $DIR/parse-error.rs:93:18
|
LL | global_asm!("{}" FOO);
| ^^^ expected `,`
error: expected operand, options, or additional template string
--> $DIR/parse-error.rs:96:19
--> $DIR/parse-error.rs:95:19
|
LL | global_asm!("{}", FOO);
| ^^^ expected operand, options, or additional template string
error: expected expression, found end of macro arguments
--> $DIR/parse-error.rs:98:24
--> $DIR/parse-error.rs:97:24
|
LL | global_asm!("{}", const);
| ^ expected expression
error: expected one of `,`, `.`, `?`, or an operator, found `FOO`
--> $DIR/parse-error.rs:100:30
--> $DIR/parse-error.rs:99:30
|
LL | global_asm!("{}", const(reg) FOO);
| ^^^ expected one of `,`, `.`, `?`, or an operator
error: expected one of `)`, `att_syntax`, or `raw`, found `FOO`
--> $DIR/parse-error.rs:102:25
--> $DIR/parse-error.rs:101:25
|
LL | global_asm!("", options(FOO));
| ^^^ expected one of `)`, `att_syntax`, or `raw`
error: expected one of `)`, `att_syntax`, or `raw`, found `nomem`
--> $DIR/parse-error.rs:104:25
--> $DIR/parse-error.rs:103:25
|
LL | global_asm!("", options(nomem FOO));
| ^^^^^ expected one of `)`, `att_syntax`, or `raw`
error: expected one of `)`, `att_syntax`, or `raw`, found `nomem`
--> $DIR/parse-error.rs:106:25
--> $DIR/parse-error.rs:105:25
|
LL | global_asm!("", options(nomem, FOO));
| ^^^^^ expected one of `)`, `att_syntax`, or `raw`
error: arguments are not allowed after options
--> $DIR/parse-error.rs:108:30
--> $DIR/parse-error.rs:107:30
|
LL | global_asm!("{}", options(), const FOO);
| --------- ^^^^^^^^^ argument
@ -295,25 +287,25 @@ LL | global_asm!("{}", options(), const FOO);
| previous options
error: expected string literal
--> $DIR/parse-error.rs:110:29
--> $DIR/parse-error.rs:109:29
|
LL | global_asm!("", clobber_abi(FOO));
| ^^^ not a string literal
error: expected `)`, found `FOO`
--> $DIR/parse-error.rs:112:33
--> $DIR/parse-error.rs:111:33
|
LL | global_asm!("", clobber_abi("C" FOO));
| ^^^ expected `)`
error: expected `)`, found `,`
--> $DIR/parse-error.rs:114:32
--> $DIR/parse-error.rs:113:32
|
LL | global_asm!("", clobber_abi("C", FOO));
| ^ expected `)`
error: arguments are not allowed after clobber_abi
--> $DIR/parse-error.rs:116:37
--> $DIR/parse-error.rs:115:37
|
LL | global_asm!("{}", clobber_abi("C"), const FOO);
| ---------------- ^^^^^^^^^ argument
@ -321,13 +313,13 @@ LL | global_asm!("{}", clobber_abi("C"), const FOO);
| clobber_abi
error: `clobber_abi` cannot be used with `global_asm!`
--> $DIR/parse-error.rs:116:19
--> $DIR/parse-error.rs:115:19
|
LL | global_asm!("{}", clobber_abi("C"), const FOO);
| ^^^^^^^^^^^^^^^^
error: clobber_abi is not allowed after options
--> $DIR/parse-error.rs:119:28
--> $DIR/parse-error.rs:118:28
|
LL | global_asm!("", options(), clobber_abi("C"));
| --------- ^^^^^^^^^^^^^^^^
@ -335,23 +327,21 @@ LL | global_asm!("", options(), clobber_abi("C"));
| options
error: clobber_abi is not allowed after options
--> $DIR/parse-error.rs:121:30
--> $DIR/parse-error.rs:120:30
|
LL | global_asm!("{}", options(), clobber_abi("C"), const FOO);
| --------- ^^^^^^^^^^^^^^^^
| |
| options
error: clobber_abi specified multiple times
--> $DIR/parse-error.rs:123:35
error: `clobber_abi` cannot be used with `global_asm!`
--> $DIR/parse-error.rs:122:35
|
LL | global_asm!("", clobber_abi("C"), clobber_abi("C"));
| ---------------- ^^^^^^^^^^^^^^^^
| |
| clobber_abi previously specified here
| ^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^
error: duplicate argument named `a`
--> $DIR/parse-error.rs:125:35
--> $DIR/parse-error.rs:124:35
|
LL | global_asm!("{a}", a = const FOO, a = const BAR);
| ------------- ^^^^^^^^^^^^^ duplicate argument
@ -359,7 +349,7 @@ LL | global_asm!("{a}", a = const FOO, a = const BAR);
| previously here
error: argument never used
--> $DIR/parse-error.rs:125:35
--> $DIR/parse-error.rs:124:35
|
LL | global_asm!("{a}", a = const FOO, a = const BAR);
| ^^^^^^^^^^^^^ argument never used
@ -367,19 +357,19 @@ LL | global_asm!("{a}", a = const FOO, a = const BAR);
= help: if this argument is intentionally unused, consider using it in an asm comment: `"/* {1} */"`
error: expected one of `clobber_abi`, `const`, or `options`, found `""`
--> $DIR/parse-error.rs:128:28
--> $DIR/parse-error.rs:127:28
|
LL | global_asm!("", options(), "");
| ^^ expected one of `clobber_abi`, `const`, or `options`
error: expected one of `clobber_abi`, `const`, or `options`, found `"{}"`
--> $DIR/parse-error.rs:130:30
--> $DIR/parse-error.rs:129:30
|
LL | global_asm!("{}", const FOO, "{}", const FOO);
| ^^^^ expected one of `clobber_abi`, `const`, or `options`
error: asm template must be a string literal
--> $DIR/parse-error.rs:132:13
--> $DIR/parse-error.rs:131:13
|
LL | global_asm!(format!("{{{}}}", 0), const FOO);
| ^^^^^^^^^^^^^^^^^^^^
@ -387,7 +377,7 @@ LL | global_asm!(format!("{{{}}}", 0), const FOO);
= note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
error: asm template must be a string literal
--> $DIR/parse-error.rs:134:20
--> $DIR/parse-error.rs:133:20
|
LL | global_asm!("{1}", format!("{{{}}}", 0), const FOO, const BAR);
| ^^^^^^^^^^^^^^^^^^^^
@ -413,7 +403,7 @@ LL | asm!("{}", clobber_abi("C"), const foo);
| ^^^ non-constant value
error[E0435]: attempt to use a non-constant value in a constant
--> $DIR/parse-error.rs:55:31
--> $DIR/parse-error.rs:54:31
|
LL | let mut foo = 0;
| ---------- help: consider using `const` instead of `let`: `const foo`
@ -422,7 +412,7 @@ LL | asm!("{a}", a = const foo, a = const bar);
| ^^^ non-constant value
error[E0435]: attempt to use a non-constant value in a constant
--> $DIR/parse-error.rs:55:46
--> $DIR/parse-error.rs:54:46
|
LL | let mut bar = 0;
| ---------- help: consider using `const` instead of `let`: `const bar`
@ -431,7 +421,7 @@ LL | asm!("{a}", a = const foo, a = const bar);
| ^^^ non-constant value
error[E0435]: attempt to use a non-constant value in a constant
--> $DIR/parse-error.rs:62:45
--> $DIR/parse-error.rs:61:45
|
LL | let mut bar = 0;
| ---------- help: consider using `const` instead of `let`: `const bar`
@ -440,7 +430,7 @@ LL | asm!("{a}", in("x0") foo, a = const bar);
| ^^^ non-constant value
error[E0435]: attempt to use a non-constant value in a constant
--> $DIR/parse-error.rs:65:45
--> $DIR/parse-error.rs:64:45
|
LL | let mut bar = 0;
| ---------- help: consider using `const` instead of `let`: `const bar`
@ -449,7 +439,7 @@ LL | asm!("{a}", in("x0") foo, a = const bar);
| ^^^ non-constant value
error[E0435]: attempt to use a non-constant value in a constant
--> $DIR/parse-error.rs:68:41
--> $DIR/parse-error.rs:67:41
|
LL | let mut bar = 0;
| ---------- help: consider using `const` instead of `let`: `const bar`
@ -457,6 +447,6 @@ LL | let mut bar = 0;
LL | asm!("{1}", in("x0") foo, const bar);
| ^^^ non-constant value
error: aborting due to 66 previous errors
error: aborting due to 65 previous errors
For more information about this error, try `rustc --explain E0435`.

32
src/test/ui/asm/x86_64/bad-clobber-abi.rs Normal file
View File

@ -0,0 +1,32 @@
// needs-asm-support
// only-x86_64
// checks various modes of failure for the `clobber_abi` argument (after parsing)
#![feature(asm)]
fn main() {
unsafe {
asm!("", clobber_abi("C"));
asm!("", clobber_abi("foo"));
//~^ ERROR invalid ABI for `clobber_abi`
asm!("", clobber_abi("C", "foo"));
//~^ ERROR invalid ABI for `clobber_abi`
asm!("", clobber_abi("C", "C"));
//~^ ERROR `C` ABI specified multiple times
asm!("", clobber_abi("win64", "sysv64"));
asm!("", clobber_abi("win64", "efiapi"));
//~^ ERROR `win64` ABI specified multiple times
asm!("", clobber_abi("C", "foo", "C"));
//~^ ERROR invalid ABI for `clobber_abi`
//~| ERROR `C` ABI specified multiple times
asm!("", clobber_abi("win64", "foo", "efiapi"));
//~^ ERROR invalid ABI for `clobber_abi`
//~| ERROR `win64` ABI specified multiple times
asm!("", clobber_abi("C"), clobber_abi("C"));
//~^ ERROR `C` ABI specified multiple times
asm!("", clobber_abi("win64"), clobber_abi("sysv64"));
asm!("", clobber_abi("win64"), clobber_abi("efiapi"));
//~^ ERROR `win64` ABI specified multiple times
}
}

88
src/test/ui/asm/x86_64/bad-clobber-abi.stderr Normal file
View File

@ -0,0 +1,88 @@
error: invalid ABI for `clobber_abi`
--> $DIR/bad-clobber-abi.rs:11:18
|
LL | asm!("", clobber_abi("foo"));
| ^^^^^^^^^^^^^^^^^^
|
= note: the following ABIs are supported on this target: `C`, `system`, `efiapi`, `win64`, `sysv64`
error: invalid ABI for `clobber_abi`
--> $DIR/bad-clobber-abi.rs:13:35
|
LL | asm!("", clobber_abi("C", "foo"));
| ^^^^^
|
= note: the following ABIs are supported on this target: `C`, `system`, `efiapi`, `win64`, `sysv64`
error: `C` ABI specified multiple times
--> $DIR/bad-clobber-abi.rs:15:35
|
LL | asm!("", clobber_abi("C", "C"));
| --- ^^^
| |
| previously specified here
error: `win64` ABI specified multiple times
--> $DIR/bad-clobber-abi.rs:18:39
|
LL | asm!("", clobber_abi("win64", "efiapi"));
| ------- ^^^^^^^^
| |
| previously specified here
|
= note: these ABIs are equivalent on the current target
error: invalid ABI for `clobber_abi`
--> $DIR/bad-clobber-abi.rs:20:35
|
LL | asm!("", clobber_abi("C", "foo", "C"));
| ^^^^^
|
= note: the following ABIs are supported on this target: `C`, `system`, `efiapi`, `win64`, `sysv64`
error: `C` ABI specified multiple times
--> $DIR/bad-clobber-abi.rs:20:42
|
LL | asm!("", clobber_abi("C", "foo", "C"));
| --- ^^^
| |
| previously specified here
error: invalid ABI for `clobber_abi`
--> $DIR/bad-clobber-abi.rs:23:39
|
LL | asm!("", clobber_abi("win64", "foo", "efiapi"));
| ^^^^^
|
= note: the following ABIs are supported on this target: `C`, `system`, `efiapi`, `win64`, `sysv64`
error: `win64` ABI specified multiple times
--> $DIR/bad-clobber-abi.rs:23:46
|
LL | asm!("", clobber_abi("win64", "foo", "efiapi"));
| ------- ^^^^^^^^
| |
| previously specified here
|
= note: these ABIs are equivalent on the current target
error: `C` ABI specified multiple times
--> $DIR/bad-clobber-abi.rs:26:36
|
LL | asm!("", clobber_abi("C"), clobber_abi("C"));
| ---------------- ^^^^^^^^^^^^^^^^
| |
| previously specified here
error: `win64` ABI specified multiple times
--> $DIR/bad-clobber-abi.rs:29:40
|
LL | asm!("", clobber_abi("win64"), clobber_abi("efiapi"));
| -------------------- ^^^^^^^^^^^^^^^^^^^^^
| |
| previously specified here
|
= note: these ABIs are equivalent on the current target
error: aborting due to 10 previous errors

3
src/test/ui/asm/x86_64/bad-options.rs
View File

@ -21,6 +21,9 @@ fn main() {
//~^ ERROR invalid ABI for `clobber_abi`
asm!("{}", out(reg) foo, clobber_abi("C"));
//~^ ERROR asm with `clobber_abi` must specify explicit registers for outputs
asm!("{}", out(reg) foo, clobber_abi("C"), clobber_abi("C"));
//~^ ERROR asm with `clobber_abi` must specify explicit registers for outputs
//~| ERROR `C` ABI specified multiple times
asm!("", out("eax") foo, clobber_abi("C"));
}
}

31
src/test/ui/asm/x86_64/bad-options.stderr
View File

@ -36,38 +36,47 @@ LL | asm!("{}", out(reg) foo, clobber_abi("C"));
| |
| generic outputs
error: asm with `clobber_abi` must specify explicit registers for outputs
--> $DIR/bad-options.rs:24:20
|
LL | asm!("{}", out(reg) foo, clobber_abi("C"), clobber_abi("C"));
| ^^^^^^^^^^^^ ---------------- ---------------- clobber_abi
| | |
| | clobber_abi
| generic outputs
error: expected one of `)`, `att_syntax`, or `raw`, found `nomem`
--> $DIR/bad-options.rs:28:25
--> $DIR/bad-options.rs:31:25
|
LL | global_asm!("", options(nomem));
| ^^^^^ expected one of `)`, `att_syntax`, or `raw`
error: expected one of `)`, `att_syntax`, or `raw`, found `readonly`
--> $DIR/bad-options.rs:30:25
--> $DIR/bad-options.rs:33:25
|
LL | global_asm!("", options(readonly));
| ^^^^^^^^ expected one of `)`, `att_syntax`, or `raw`
error: expected one of `)`, `att_syntax`, or `raw`, found `noreturn`
--> $DIR/bad-options.rs:32:25
--> $DIR/bad-options.rs:35:25
|
LL | global_asm!("", options(noreturn));
| ^^^^^^^^ expected one of `)`, `att_syntax`, or `raw`
error: expected one of `)`, `att_syntax`, or `raw`, found `pure`
--> $DIR/bad-options.rs:34:25
--> $DIR/bad-options.rs:37:25
|
LL | global_asm!("", options(pure));
| ^^^^ expected one of `)`, `att_syntax`, or `raw`
error: expected one of `)`, `att_syntax`, or `raw`, found `nostack`
--> $DIR/bad-options.rs:36:25
--> $DIR/bad-options.rs:39:25
|
LL | global_asm!("", options(nostack));
| ^^^^^^^ expected one of `)`, `att_syntax`, or `raw`
error: expected one of `)`, `att_syntax`, or `raw`, found `preserves_flags`
--> $DIR/bad-options.rs:38:25
--> $DIR/bad-options.rs:41:25
|
LL | global_asm!("", options(preserves_flags));
| ^^^^^^^^^^^^^^^ expected one of `)`, `att_syntax`, or `raw`
@ -80,5 +89,13 @@ LL | asm!("", clobber_abi("foo"));
|
= note: the following ABIs are supported on this target: `C`, `system`, `efiapi`, `win64`, `sysv64`
error: aborting due to 13 previous errors
error: `C` ABI specified multiple times
--> $DIR/bad-options.rs:24:52
|
LL | asm!("{}", out(reg) foo, clobber_abi("C"), clobber_abi("C"));
| ---------------- ^^^^^^^^^^^^^^^^
| |
| previously specified here
error: aborting due to 15 previous errors

33
src/test/ui/asm/x86_64/multiple-clobber-abi.rs Normal file
View File

@ -0,0 +1,33 @@
// run-pass
// needs-asm-support
// only-x86_64
// Checks that multiple clobber_abi options can be used
#![feature(asm)]
extern "sysv64" fn foo(x: i32) -> i32 {
x + 16
}
extern "win64" fn bar(x: i32) -> i32 {
x / 2
}
fn main() {
let x = 8;
let y: i32;
// call `foo` with `x` as the input, and then `bar` with the output of `foo`
// and output that to `y`
unsafe {
asm!(
"call {}; mov rcx, rax; call {}",
sym foo,
sym bar,
in("rdi") x,
out("rax") y,
clobber_abi("sysv64", "win64"),
);
}
assert_eq!((x, y), (8, 12));
}

14
src/test/ui/asm/x86_64/parse-error.rs
View File

@ -37,12 +37,14 @@ fn main() {
asm!("{}", options(), const foo);
//~^ ERROR arguments are not allowed after options
//~^^ ERROR attempt to use a non-constant value in a constant
asm!("", clobber_abi());
//~^ ERROR at least one abi must be provided
asm!("", clobber_abi(foo));
//~^ ERROR expected string literal
asm!("", clobber_abi("C" foo));
//~^ ERROR expected `)`, found `foo`
//~^ ERROR expected one of `)` or `,`, found `foo`
asm!("", clobber_abi("C", foo));
//~^ ERROR expected `)`, found `,`
//~^ ERROR expected string literal
asm!("{}", clobber_abi("C"), const foo);
//~^ ERROR arguments are not allowed after clobber_abi
//~^^ ERROR attempt to use a non-constant value in a constant
@ -50,8 +52,6 @@ fn main() {
//~^ ERROR clobber_abi is not allowed after options
asm!("{}", options(), clobber_abi("C"), const foo);
//~^ ERROR clobber_abi is not allowed after options
asm!("", clobber_abi("C"), clobber_abi("C"));
//~^ ERROR clobber_abi specified multiple times
asm!("{a}", a = const foo, a = const bar);
//~^ ERROR duplicate argument named `a`
//~^^ ERROR argument never used
@ -110,9 +110,9 @@ global_asm!("{}", options(), const FOO);
global_asm!("", clobber_abi(FOO));
//~^ ERROR expected string literal
global_asm!("", clobber_abi("C" FOO));
//~^ ERROR expected `)`, found `FOO`
//~^ ERROR expected one of `)` or `,`, found `FOO`
global_asm!("", clobber_abi("C", FOO));
//~^ ERROR expected `)`, found `,`
//~^ ERROR expected string literal
global_asm!("{}", clobber_abi("C"), const FOO);
//~^ ERROR arguments are not allowed after clobber_abi
//~^^ ERROR `clobber_abi` cannot be used with `global_asm!`
@ -121,7 +121,7 @@ global_asm!("", options(), clobber_abi("C"));
global_asm!("{}", options(), clobber_abi("C"), const FOO);
//~^ ERROR clobber_abi is not allowed after options
global_asm!("", clobber_abi("C"), clobber_abi("C"));
//~^ ERROR clobber_abi specified multiple times
//~^ ERROR `clobber_abi` cannot be used with `global_asm!`
global_asm!("{a}", a = const FOO, a = const BAR);
//~^ ERROR duplicate argument named `a`
//~^^ ERROR argument never used

54
src/test/ui/asm/x86_64/parse-error.stderr
View File

@ -90,26 +90,32 @@ LL | asm!("{}", options(), const foo);
| |
| previous options
error: expected string literal
error: at least one abi must be provided as an argument to `clobber_abi`
--> $DIR/parse-error.rs:40:30
|
LL | asm!("", clobber_abi());
| ^
error: expected string literal
--> $DIR/parse-error.rs:42:30
|
LL | asm!("", clobber_abi(foo));
| ^^^ not a string literal
error: expected `)`, found `foo`
--> $DIR/parse-error.rs:42:34
error: expected one of `)` or `,`, found `foo`
--> $DIR/parse-error.rs:44:34
|
LL | asm!("", clobber_abi("C" foo));
| ^^^ expected `)`
| ^^^ expected one of `)` or `,`
error: expected `)`, found `,`
--> $DIR/parse-error.rs:44:33
error: expected string literal
--> $DIR/parse-error.rs:46:35
|
LL | asm!("", clobber_abi("C", foo));
| ^ expected `)`
| ^^^ not a string literal
error: arguments are not allowed after clobber_abi
--> $DIR/parse-error.rs:46:38
--> $DIR/parse-error.rs:48:38
|
LL | asm!("{}", clobber_abi("C"), const foo);
| ---------------- ^^^^^^^^^ argument
@ -117,7 +123,7 @@ LL | asm!("{}", clobber_abi("C"), const foo);
| clobber_abi
error: clobber_abi is not allowed after options
--> $DIR/parse-error.rs:49:29
--> $DIR/parse-error.rs:51:29
|
LL | asm!("", options(), clobber_abi("C"));
| --------- ^^^^^^^^^^^^^^^^
@ -125,21 +131,13 @@ LL | asm!("", options(), clobber_abi("C"));
| options
error: clobber_abi is not allowed after options
--> $DIR/parse-error.rs:51:31
--> $DIR/parse-error.rs:53:31
|
LL | asm!("{}", options(), clobber_abi("C"), const foo);
| --------- ^^^^^^^^^^^^^^^^
| |
| options
error: clobber_abi specified multiple times
--> $DIR/parse-error.rs:53:36
|
LL | asm!("", clobber_abi("C"), clobber_abi("C"));
| ---------------- ^^^^^^^^^^^^^^^^
| |
| clobber_abi previously specified here
error: duplicate argument named `a`
--> $DIR/parse-error.rs:55:36
|
@ -300,17 +298,17 @@ error: expected string literal
LL | global_asm!("", clobber_abi(FOO));
| ^^^ not a string literal
error: expected `)`, found `FOO`
error: expected one of `)` or `,`, found `FOO`
--> $DIR/parse-error.rs:112:33
|
LL | global_asm!("", clobber_abi("C" FOO));
| ^^^ expected `)`
| ^^^ expected one of `)` or `,`
error: expected `)`, found `,`
--> $DIR/parse-error.rs:114:32
error: expected string literal
--> $DIR/parse-error.rs:114:34
|
LL | global_asm!("", clobber_abi("C", FOO));
| ^ expected `)`
| ^^^ not a string literal
error: arguments are not allowed after clobber_abi
--> $DIR/parse-error.rs:116:37
@ -342,13 +340,11 @@ LL | global_asm!("{}", options(), clobber_abi("C"), const FOO);
| |
| options
error: clobber_abi specified multiple times
--> $DIR/parse-error.rs:123:35
error: `clobber_abi` cannot be used with `global_asm!`
--> $DIR/parse-error.rs:123:17
|
LL | global_asm!("", clobber_abi("C"), clobber_abi("C"));
| ---------------- ^^^^^^^^^^^^^^^^
| |
| clobber_abi previously specified here
| ^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^
error: duplicate argument named `a`
--> $DIR/parse-error.rs:125:35
@ -404,7 +400,7 @@ LL | asm!("{}", options(), const foo);
| ^^^ non-constant value
error[E0435]: attempt to use a non-constant value in a constant
--> $DIR/parse-error.rs:46:44
--> $DIR/parse-error.rs:48:44
|
LL | let mut foo = 0;
| ---------- help: consider using `const` instead of `let`: `const foo`