104 lines
3.3 KiB
Rust
104 lines
3.3 KiB
Rust
//! `SubTest` trait.
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use anyhow::Context as _;
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use cranelift_codegen::ir::Function;
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use cranelift_codegen::isa::TargetIsa;
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use cranelift_codegen::settings::{Flags, FlagsOrIsa};
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use cranelift_reader::{Comment, Details};
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use filecheck::{Checker, CheckerBuilder, NO_VARIABLES};
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use std::borrow::Cow;
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/// Context for running a test on a single function.
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pub struct Context<'a> {
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/// Comments from the preamble f the test file. These apply to all functions.
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pub preamble_comments: &'a [Comment<'a>],
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/// Additional details about the function from the parser.
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pub details: Details<'a>,
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/// Was the function verified before running this test?
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pub verified: bool,
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/// ISA-independent flags for this test.
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pub flags: &'a Flags,
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/// Target ISA to test against. Only guaranteed to be present for sub-tests whose `needs_isa`
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/// method returned `true`. For other sub-tests, this is set if the test file has a unique ISA.
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pub isa: Option<&'a dyn TargetIsa>,
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/// Full path to the file containing the test.
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pub file_path: &'a str,
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}
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impl<'a> Context<'a> {
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/// Get a `FlagsOrIsa` object for passing to the verifier.
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pub fn flags_or_isa(&self) -> FlagsOrIsa<'a> {
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FlagsOrIsa {
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flags: self.flags,
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isa: self.isa,
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}
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}
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}
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/// Common interface for implementations of test commands.
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///
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/// Each `.clif` test file may contain multiple test commands, each represented by a `SubTest`
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/// trait object.
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pub trait SubTest {
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/// Name identifying this subtest. Typically the same as the test command.
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fn name(&self) -> &'static str;
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/// Should the verifier be run on the function before running the test?
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fn needs_verifier(&self) -> bool {
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true
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}
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/// Does this test mutate the function when it runs?
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/// This is used as a hint to avoid cloning the function needlessly.
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fn is_mutating(&self) -> bool {
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false
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}
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/// Does this test need a `TargetIsa` trait object?
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fn needs_isa(&self) -> bool {
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false
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}
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/// Run this test on `func`.
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fn run(&self, func: Cow<Function>, context: &Context) -> anyhow::Result<()>;
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}
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/// Run filecheck on `text`, using directives extracted from `context`.
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pub fn run_filecheck(text: &str, context: &Context) -> anyhow::Result<()> {
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let checker = build_filechecker(context)?;
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if checker
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.check(text, NO_VARIABLES)
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.context("filecheck failed")?
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{
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Ok(())
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} else {
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// Filecheck mismatch. Emit an explanation as output.
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let (_, explain) = checker
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.explain(text, NO_VARIABLES)
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.context("filecheck explain failed")?;
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anyhow::bail!("filecheck failed:\n{}{}", checker, explain);
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}
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}
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/// Build a filechecker using the directives in the file preamble and the function's comments.
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pub fn build_filechecker(context: &Context) -> anyhow::Result<Checker> {
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let mut builder = CheckerBuilder::new();
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// Preamble comments apply to all functions.
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for comment in context.preamble_comments {
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builder
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.directive(comment.text)
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.context("filecheck directive failed")?;
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}
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for comment in &context.details.comments {
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builder
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.directive(comment.text)
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.context("filecheck directive failed")?;
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}
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Ok(builder.finish())
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}
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