1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
// This test makes sure that PGO profiling data leads to cold functions being
// marked as `cold` and hot functions with `inlinehint`.
// The test program contains an `if` where actual execution only ever takes the
// `else` branch. Accordingly, we expect the function that is never called to
// be marked as cold.
// See https://github.com/rust-lang/rust/pull/60262
//@ needs-profiler-runtime
//@ ignore-cross-compile
use run_make_support::{
cwd, has_extension, has_prefix, llvm_filecheck, llvm_profdata, rfs, run_with_args, rustc,
shallow_find_files,
};
fn main() {
// Compile the test program with instrumentation
// Disable the pre-inlining pass (i.e. a pass that does some inlining before
// it adds the profiling instrumentation). Disabling this pass leads to
// rather predictable IR which we need for this test to be stable.
rustc()
.opt_level("2")
.codegen_units(1)
.arg("-Cllvm-args=-disable-preinline")
.codegen_source_order()
.profile_generate(cwd())
.input("main.rs")
.run();
// Run it in order to generate some profiling data
run_with_args("main", &["some-argument"]);
// Postprocess the profiling data so it can be used by the compiler
let profraw_files = shallow_find_files(cwd(), |path| {
has_prefix(path, "default") && has_extension(path, "profraw")
});
let profraw_file = profraw_files.get(0).unwrap();
llvm_profdata().merge().output("merged.profdata").input(profraw_file).run();
// Compile the test program again, making use of the profiling data
rustc()
.opt_level("2")
.codegen_units(1)
.arg("-Cllvm-args=-disable-preinline")
.profile_use("merged.profdata")
.emit("llvm-ir")
.codegen_source_order()
.input("main.rs")
.run();
// Check that the generate IR contains some things that we expect.
// We feed the file into LLVM FileCheck tool *with its lines reversed* so that we see the
// line with the function name before the line with the function attributes.
// FileCheck only supports checking that something matches on the next line,
// but not if something matches on the previous line.
let ir = rfs::read_to_string("main.ll");
let lines: Vec<_> = ir.lines().rev().collect();
let mut reversed_ir = lines.join("\n");
reversed_ir.push('\n');
llvm_filecheck().patterns("filecheck-patterns.txt").stdin_buf(reversed_ir.as_bytes()).run();
}
|
