1078b6f942
Allow the `asm!` macro to accept a series of template arguments, and interpret them as if they were concatenated with a '\n' between them. This allows writing an `asm!` where each line of assembly appears in a separate template string argument. This syntax makes it possible for rustfmt to reliably format and indent each line of assembly, without risking changes to the inside of a template string. It also avoids the complexity of having the user carefully format and indent a multi-line string (including where to put the surrounding quotes), and avoids the extra indentation and lines of a call to `concat!`. For example, rewriting the second example from the [blog post on the new inline assembly syntax](https://blog.rust-lang.org/inside-rust/2020/06/08/new-inline-asm.html) using multiple template strings: ```rust fn main() { let mut bits = [0u8; 64]; for value in 0..=1024u64 { let popcnt; unsafe { asm!( " popcnt {popcnt}, {v}", "2:", " blsi rax, {v}", " jz 1f", " xor {v}, rax", " tzcnt rax, rax", " stosb", " jmp 2b", "1:", v = inout(reg) value => _, popcnt = out(reg) popcnt, out("rax") _, // scratch inout("rdi") bits.as_mut_ptr() => _, ); } println!("bits of {}: {:?}", value, &bits[0..popcnt]); } } ``` Note that all the template strings must appear before all other arguments; you cannot, for instance, provide a series of template strings intermixed with the corresponding operands. In order to get srcloc mappings right for macros that generate multi-line string literals, create one line_span for each line in the string literal, each pointing to the macro. Make `rustc_parse_format::Parser::curarg` `pub`, so that we can propagate it from one template string argument to the next.
34 lines
928 B
ObjectPascal
34 lines
928 B
ObjectPascal
#![feature(prelude_import)]
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#![no_std]
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#![feature(asm)]
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#[prelude_import]
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use ::std::prelude::v1::*;
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#[macro_use]
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extern crate std;
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// pretty-mode:expanded
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// pp-exact:asm.pp
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// only-x86_64
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pub fn main() {
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let a: i32;
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let mut b = 4i32;
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unsafe {
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asm!("");
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asm!("");
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asm!("", options(nomem, nostack));
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asm!("{0}", in(reg) 4);
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asm!("{0}", out(reg) a);
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asm!("{0}", inout(reg) b);
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asm!("{0} {1}", out(reg) _, inlateout(reg) b => _);
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asm!("", out("al") _, lateout("rbx") _);
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asm!("inst1\ninst2");
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asm!("inst1 {0}, 42\ninst2 {1}, 24", in(reg) a, out(reg) b);
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asm!("inst2 {1}, 24\ninst1 {0}, 42", in(reg) a, out(reg) b);
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asm!("inst1 {0}, 42\ninst2 {1}, 24", in(reg) a, out(reg) b);
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asm!("inst1\ninst2");
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asm!("inst1\ninst2");
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asm!("inst1\n\tinst2");
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asm!("inst1\ninst2\ninst3\ninst4");
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}
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}
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