mirror of https://github.com/rust-lang/rust.git
66 lines
2.2 KiB
Rust
66 lines
2.2 KiB
Rust
//! Regression test for <https://github.com/rust-lang/rust/issues/135332>.
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//!
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//! We can't simply drop debuginfo location spans when LLVM's location discriminator value limit is
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//! reached. Otherwise, with `-Z verify-llvm-ir` and fat LTO, LLVM will report a broken module for
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//!
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//! ```text
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//! inlinable function call in a function with debug info must have a !dbg location
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//! ```
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//@ ignore-cross-compile
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//@ needs-dynamic-linking
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//@ only-nightly (requires unstable rustc flag)
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#![deny(warnings)]
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use run_make_support::{dynamic_lib_name, rfs, rust_lib_name, rustc};
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// Synthesize a function that will have a large (`n`) number of functions
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// MIR-inlined into it. When combined with a proc-macro, all of these inline
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// callsites will have the same span, forcing rustc to use the DWARF
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// discriminator to distinguish between them. LLVM's capacity to store that
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// discriminator is not infinite (currently it allocates 12 bits for a
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// maximum value of 4096) so if this function gets big enough rustc's error
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// handling path will be exercised.
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fn generate_program(n: u32) -> String {
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let mut program = String::from("pub type BigType = Vec<Vec<String>>;\n\n");
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program.push_str("pub fn big_function() -> BigType {\n");
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program.push_str(" vec![\n");
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for i in 1..=n {
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program.push_str(&format!("vec![\"string{}\".to_owned()],\n", i));
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}
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program.push_str(" ]\n");
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program.push_str("}\n");
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program
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}
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fn main() {
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// The reported threshold is around 1366 (4096/3), but let's bump it to
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// around 1500 to be less sensitive.
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rfs::write("generated.rs", generate_program(1500));
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rustc()
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.input("proc.rs")
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.crate_type("proc-macro")
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.edition("2021")
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.arg("-Cdebuginfo=line-tables-only")
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.run();
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rustc()
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.extern_("proc", dynamic_lib_name("proc"))
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.input("other.rs")
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.crate_type("rlib")
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.edition("2021")
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.opt_level("3")
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.arg("-Cdebuginfo=line-tables-only")
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.run();
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rustc()
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.extern_("other", rust_lib_name("other"))
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.input("main.rs")
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.edition("2021")
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.opt_level("3")
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.arg("-Cdebuginfo=line-tables-only")
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.arg("-Clto=fat")
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.arg("-Zverify-llvm-ir")
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.run();
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}
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