588 lines
22 KiB
Rust
588 lines
22 KiB
Rust
/// The expansion from a test function to the appropriate test struct for libtest
|
|
/// Ideally, this code would be in libtest but for efficiency and error messages it lives here.
|
|
use crate::util::{check_builtin_macro_attribute, warn_on_duplicate_attribute};
|
|
use rustc_ast::ptr::P;
|
|
use rustc_ast::{self as ast, attr};
|
|
use rustc_ast_pretty::pprust;
|
|
use rustc_errors::Applicability;
|
|
use rustc_expand::base::*;
|
|
use rustc_span::symbol::{sym, Ident, Symbol};
|
|
use rustc_span::{FileNameDisplayPreference, Span};
|
|
use std::iter;
|
|
use thin_vec::{thin_vec, ThinVec};
|
|
|
|
/// #[test_case] is used by custom test authors to mark tests
|
|
/// When building for test, it needs to make the item public and gensym the name
|
|
/// Otherwise, we'll omit the item. This behavior means that any item annotated
|
|
/// with #[test_case] is never addressable.
|
|
///
|
|
/// We mark item with an inert attribute "rustc_test_marker" which the test generation
|
|
/// logic will pick up on.
|
|
pub fn expand_test_case(
|
|
ecx: &mut ExtCtxt<'_>,
|
|
attr_sp: Span,
|
|
meta_item: &ast::MetaItem,
|
|
anno_item: Annotatable,
|
|
) -> Vec<Annotatable> {
|
|
check_builtin_macro_attribute(ecx, meta_item, sym::test_case);
|
|
warn_on_duplicate_attribute(&ecx, &anno_item, sym::test_case);
|
|
|
|
if !ecx.ecfg.should_test {
|
|
return vec![];
|
|
}
|
|
|
|
let sp = ecx.with_def_site_ctxt(attr_sp);
|
|
let (mut item, is_stmt) = match anno_item {
|
|
Annotatable::Item(item) => (item, false),
|
|
Annotatable::Stmt(stmt) if let ast::StmtKind::Item(_) = stmt.kind => if let ast::StmtKind::Item(i) = stmt.into_inner().kind {
|
|
(i, true)
|
|
} else {
|
|
unreachable!()
|
|
},
|
|
_ => {
|
|
ecx.struct_span_err(
|
|
anno_item.span(),
|
|
"`#[test_case]` attribute is only allowed on items",
|
|
)
|
|
.emit();
|
|
|
|
return vec![];
|
|
}
|
|
};
|
|
item = item.map(|mut item| {
|
|
let test_path_symbol = Symbol::intern(&item_path(
|
|
// skip the name of the root module
|
|
&ecx.current_expansion.module.mod_path[1..],
|
|
&item.ident,
|
|
));
|
|
item.vis = ast::Visibility {
|
|
span: item.vis.span,
|
|
kind: ast::VisibilityKind::Public,
|
|
tokens: None,
|
|
};
|
|
item.ident.span = item.ident.span.with_ctxt(sp.ctxt());
|
|
item.attrs.push(ecx.attr_name_value_str(sym::rustc_test_marker, test_path_symbol, sp));
|
|
item
|
|
});
|
|
|
|
let ret = if is_stmt {
|
|
Annotatable::Stmt(P(ecx.stmt_item(item.span, item)))
|
|
} else {
|
|
Annotatable::Item(item)
|
|
};
|
|
|
|
vec![ret]
|
|
}
|
|
|
|
pub fn expand_test(
|
|
cx: &mut ExtCtxt<'_>,
|
|
attr_sp: Span,
|
|
meta_item: &ast::MetaItem,
|
|
item: Annotatable,
|
|
) -> Vec<Annotatable> {
|
|
check_builtin_macro_attribute(cx, meta_item, sym::test);
|
|
warn_on_duplicate_attribute(&cx, &item, sym::test);
|
|
expand_test_or_bench(cx, attr_sp, item, false)
|
|
}
|
|
|
|
pub fn expand_bench(
|
|
cx: &mut ExtCtxt<'_>,
|
|
attr_sp: Span,
|
|
meta_item: &ast::MetaItem,
|
|
item: Annotatable,
|
|
) -> Vec<Annotatable> {
|
|
check_builtin_macro_attribute(cx, meta_item, sym::bench);
|
|
warn_on_duplicate_attribute(&cx, &item, sym::bench);
|
|
expand_test_or_bench(cx, attr_sp, item, true)
|
|
}
|
|
|
|
pub fn expand_test_or_bench(
|
|
cx: &mut ExtCtxt<'_>,
|
|
attr_sp: Span,
|
|
item: Annotatable,
|
|
is_bench: bool,
|
|
) -> Vec<Annotatable> {
|
|
// If we're not in test configuration, remove the annotated item
|
|
if !cx.ecfg.should_test {
|
|
return vec![];
|
|
}
|
|
|
|
let (item, is_stmt) = match item {
|
|
Annotatable::Item(i) => (i, false),
|
|
Annotatable::Stmt(stmt) if matches!(stmt.kind, ast::StmtKind::Item(_)) => {
|
|
// FIXME: Use an 'if let' guard once they are implemented
|
|
if let ast::StmtKind::Item(i) = stmt.into_inner().kind {
|
|
(i, true)
|
|
} else {
|
|
unreachable!()
|
|
}
|
|
}
|
|
other => {
|
|
cx.struct_span_err(
|
|
other.span(),
|
|
"`#[test]` attribute is only allowed on non associated functions",
|
|
)
|
|
.emit();
|
|
return vec![other];
|
|
}
|
|
};
|
|
|
|
// Note: non-associated fn items are already handled by `expand_test_or_bench`
|
|
let ast::ItemKind::Fn(fn_) = &item.kind else {
|
|
let diag = &cx.sess.parse_sess.span_diagnostic;
|
|
let msg = "the `#[test]` attribute may only be used on a non-associated function";
|
|
let mut err = match item.kind {
|
|
// These were a warning before #92959 and need to continue being that to avoid breaking
|
|
// stable user code (#94508).
|
|
ast::ItemKind::MacCall(_) => diag.struct_span_warn(attr_sp, msg),
|
|
// `.forget_guarantee()` needed to get these two arms to match types. Because of how
|
|
// locally close the `.emit()` call is I'm comfortable with it, but if it can be
|
|
// reworked in the future to not need it, it'd be nice.
|
|
_ => diag.struct_span_err(attr_sp, msg).forget_guarantee(),
|
|
};
|
|
err.span_label(attr_sp, "the `#[test]` macro causes a function to be run on a test and has no effect on non-functions")
|
|
.span_label(item.span, format!("expected a non-associated function, found {} {}", item.kind.article(), item.kind.descr()))
|
|
.span_suggestion(attr_sp, "replace with conditional compilation to make the item only exist when tests are being run", "#[cfg(test)]", Applicability::MaybeIncorrect)
|
|
.emit();
|
|
|
|
return vec![Annotatable::Item(item)];
|
|
};
|
|
|
|
// has_*_signature will report any errors in the type so compilation
|
|
// will fail. We shouldn't try to expand in this case because the errors
|
|
// would be spurious.
|
|
if (!is_bench && !has_test_signature(cx, &item))
|
|
|| (is_bench && !has_bench_signature(cx, &item))
|
|
{
|
|
return vec![Annotatable::Item(item)];
|
|
}
|
|
|
|
let sp = cx.with_def_site_ctxt(item.span);
|
|
let ret_ty_sp = cx.with_def_site_ctxt(fn_.sig.decl.output.span());
|
|
let attr_sp = cx.with_def_site_ctxt(attr_sp);
|
|
|
|
let test_id = Ident::new(sym::test, attr_sp);
|
|
|
|
// creates test::$name
|
|
let test_path = |name| cx.path(ret_ty_sp, vec![test_id, Ident::from_str_and_span(name, sp)]);
|
|
|
|
// creates test::ShouldPanic::$name
|
|
let should_panic_path = |name| {
|
|
cx.path(
|
|
sp,
|
|
vec![
|
|
test_id,
|
|
Ident::from_str_and_span("ShouldPanic", sp),
|
|
Ident::from_str_and_span(name, sp),
|
|
],
|
|
)
|
|
};
|
|
|
|
// creates test::TestType::$name
|
|
let test_type_path = |name| {
|
|
cx.path(
|
|
sp,
|
|
vec![
|
|
test_id,
|
|
Ident::from_str_and_span("TestType", sp),
|
|
Ident::from_str_and_span(name, sp),
|
|
],
|
|
)
|
|
};
|
|
|
|
// creates $name: $expr
|
|
let field = |name, expr| cx.field_imm(sp, Ident::from_str_and_span(name, sp), expr);
|
|
|
|
let test_fn = if is_bench {
|
|
// A simple ident for a lambda
|
|
let b = Ident::from_str_and_span("b", attr_sp);
|
|
|
|
cx.expr_call(
|
|
sp,
|
|
cx.expr_path(test_path("StaticBenchFn")),
|
|
thin_vec![
|
|
// |b| self::test::assert_test_result(
|
|
cx.lambda1(
|
|
sp,
|
|
cx.expr_call(
|
|
sp,
|
|
cx.expr_path(test_path("assert_test_result")),
|
|
thin_vec![
|
|
// super::$test_fn(b)
|
|
cx.expr_call(
|
|
ret_ty_sp,
|
|
cx.expr_path(cx.path(sp, vec![item.ident])),
|
|
thin_vec![cx.expr_ident(sp, b)],
|
|
),
|
|
],
|
|
),
|
|
b,
|
|
), // )
|
|
],
|
|
)
|
|
} else {
|
|
cx.expr_call(
|
|
sp,
|
|
cx.expr_path(test_path("StaticTestFn")),
|
|
thin_vec![
|
|
// || {
|
|
cx.lambda0(
|
|
sp,
|
|
// test::assert_test_result(
|
|
cx.expr_call(
|
|
sp,
|
|
cx.expr_path(test_path("assert_test_result")),
|
|
thin_vec![
|
|
// $test_fn()
|
|
cx.expr_call(
|
|
ret_ty_sp,
|
|
cx.expr_path(cx.path(sp, vec![item.ident])),
|
|
ThinVec::new(),
|
|
), // )
|
|
],
|
|
), // }
|
|
), // )
|
|
],
|
|
)
|
|
};
|
|
|
|
let test_path_symbol = Symbol::intern(&item_path(
|
|
// skip the name of the root module
|
|
&cx.current_expansion.module.mod_path[1..],
|
|
&item.ident,
|
|
));
|
|
|
|
let location_info = get_location_info(cx, &item);
|
|
|
|
let mut test_const =
|
|
cx.item(
|
|
sp,
|
|
Ident::new(item.ident.name, sp),
|
|
thin_vec![
|
|
// #[cfg(test)]
|
|
cx.attr_nested_word(sym::cfg, sym::test, attr_sp),
|
|
// #[rustc_test_marker = "test_case_sort_key"]
|
|
cx.attr_name_value_str(sym::rustc_test_marker, test_path_symbol, attr_sp),
|
|
],
|
|
// const $ident: test::TestDescAndFn =
|
|
ast::ItemKind::Const(
|
|
ast::ConstItem {
|
|
defaultness: ast::Defaultness::Final,
|
|
ty: cx.ty(sp, ast::TyKind::Path(None, test_path("TestDescAndFn"))),
|
|
// test::TestDescAndFn {
|
|
expr: Some(
|
|
cx.expr_struct(
|
|
sp,
|
|
test_path("TestDescAndFn"),
|
|
thin_vec![
|
|
// desc: test::TestDesc {
|
|
field(
|
|
"desc",
|
|
cx.expr_struct(
|
|
sp,
|
|
test_path("TestDesc"),
|
|
thin_vec![
|
|
// name: "path::to::test"
|
|
field(
|
|
"name",
|
|
cx.expr_call(
|
|
sp,
|
|
cx.expr_path(test_path("StaticTestName")),
|
|
thin_vec![cx.expr_str(sp, test_path_symbol)],
|
|
),
|
|
),
|
|
// ignore: true | false
|
|
field("ignore", cx.expr_bool(sp, should_ignore(&item)),),
|
|
// ignore_message: Some("...") | None
|
|
field(
|
|
"ignore_message",
|
|
if let Some(msg) = should_ignore_message(&item) {
|
|
cx.expr_some(sp, cx.expr_str(sp, msg))
|
|
} else {
|
|
cx.expr_none(sp)
|
|
},
|
|
),
|
|
// source_file: <relative_path_of_source_file>
|
|
field("source_file", cx.expr_str(sp, location_info.0)),
|
|
// start_line: start line of the test fn identifier.
|
|
field("start_line", cx.expr_usize(sp, location_info.1)),
|
|
// start_col: start column of the test fn identifier.
|
|
field("start_col", cx.expr_usize(sp, location_info.2)),
|
|
// end_line: end line of the test fn identifier.
|
|
field("end_line", cx.expr_usize(sp, location_info.3)),
|
|
// end_col: end column of the test fn identifier.
|
|
field("end_col", cx.expr_usize(sp, location_info.4)),
|
|
// compile_fail: true | false
|
|
field("compile_fail", cx.expr_bool(sp, false)),
|
|
// no_run: true | false
|
|
field("no_run", cx.expr_bool(sp, false)),
|
|
// should_panic: ...
|
|
field(
|
|
"should_panic",
|
|
match should_panic(cx, &item) {
|
|
// test::ShouldPanic::No
|
|
ShouldPanic::No => {
|
|
cx.expr_path(should_panic_path("No"))
|
|
}
|
|
// test::ShouldPanic::Yes
|
|
ShouldPanic::Yes(None) => {
|
|
cx.expr_path(should_panic_path("Yes"))
|
|
}
|
|
// test::ShouldPanic::YesWithMessage("...")
|
|
ShouldPanic::Yes(Some(sym)) => cx.expr_call(
|
|
sp,
|
|
cx.expr_path(should_panic_path("YesWithMessage")),
|
|
thin_vec![cx.expr_str(sp, sym)],
|
|
),
|
|
},
|
|
),
|
|
// test_type: ...
|
|
field(
|
|
"test_type",
|
|
match test_type(cx) {
|
|
// test::TestType::UnitTest
|
|
TestType::UnitTest => {
|
|
cx.expr_path(test_type_path("UnitTest"))
|
|
}
|
|
// test::TestType::IntegrationTest
|
|
TestType::IntegrationTest => {
|
|
cx.expr_path(test_type_path("IntegrationTest"))
|
|
}
|
|
// test::TestPath::Unknown
|
|
TestType::Unknown => {
|
|
cx.expr_path(test_type_path("Unknown"))
|
|
}
|
|
},
|
|
),
|
|
// },
|
|
],
|
|
),
|
|
),
|
|
// testfn: test::StaticTestFn(...) | test::StaticBenchFn(...)
|
|
field("testfn", test_fn), // }
|
|
],
|
|
), // }
|
|
),
|
|
}
|
|
.into(),
|
|
),
|
|
);
|
|
test_const = test_const.map(|mut tc| {
|
|
tc.vis.kind = ast::VisibilityKind::Public;
|
|
tc
|
|
});
|
|
|
|
// extern crate test
|
|
let test_extern = cx.item(sp, test_id, ast::AttrVec::new(), ast::ItemKind::ExternCrate(None));
|
|
|
|
debug!("synthetic test item:\n{}\n", pprust::item_to_string(&test_const));
|
|
|
|
if is_stmt {
|
|
vec![
|
|
// Access to libtest under a hygienic name
|
|
Annotatable::Stmt(P(cx.stmt_item(sp, test_extern))),
|
|
// The generated test case
|
|
Annotatable::Stmt(P(cx.stmt_item(sp, test_const))),
|
|
// The original item
|
|
Annotatable::Stmt(P(cx.stmt_item(sp, item))),
|
|
]
|
|
} else {
|
|
vec![
|
|
// Access to libtest under a hygienic name
|
|
Annotatable::Item(test_extern),
|
|
// The generated test case
|
|
Annotatable::Item(test_const),
|
|
// The original item
|
|
Annotatable::Item(item),
|
|
]
|
|
}
|
|
}
|
|
|
|
fn get_location_info(cx: &ExtCtxt<'_>, item: &ast::Item) -> (Symbol, usize, usize, usize, usize) {
|
|
let span = item.ident.span;
|
|
let (source_file, lo_line, lo_col, hi_line, hi_col) =
|
|
cx.sess.source_map().span_to_location_info(span);
|
|
|
|
let file_name = match source_file {
|
|
Some(sf) => sf.name.display(FileNameDisplayPreference::Remapped).to_string(),
|
|
None => "no-location".to_string(),
|
|
};
|
|
|
|
(Symbol::intern(&file_name), lo_line, lo_col, hi_line, hi_col)
|
|
}
|
|
|
|
fn item_path(mod_path: &[Ident], item_ident: &Ident) -> String {
|
|
mod_path
|
|
.iter()
|
|
.chain(iter::once(item_ident))
|
|
.map(|x| x.to_string())
|
|
.collect::<Vec<String>>()
|
|
.join("::")
|
|
}
|
|
|
|
enum ShouldPanic {
|
|
No,
|
|
Yes(Option<Symbol>),
|
|
}
|
|
|
|
fn should_ignore(i: &ast::Item) -> bool {
|
|
attr::contains_name(&i.attrs, sym::ignore)
|
|
}
|
|
|
|
fn should_ignore_message(i: &ast::Item) -> Option<Symbol> {
|
|
match attr::find_by_name(&i.attrs, sym::ignore) {
|
|
Some(attr) => {
|
|
match attr.meta_item_list() {
|
|
// Handle #[ignore(bar = "foo")]
|
|
Some(_) => None,
|
|
// Handle #[ignore] and #[ignore = "message"]
|
|
None => attr.value_str(),
|
|
}
|
|
}
|
|
None => None,
|
|
}
|
|
}
|
|
|
|
fn should_panic(cx: &ExtCtxt<'_>, i: &ast::Item) -> ShouldPanic {
|
|
match attr::find_by_name(&i.attrs, sym::should_panic) {
|
|
Some(attr) => {
|
|
let sd = &cx.sess.parse_sess.span_diagnostic;
|
|
|
|
match attr.meta_item_list() {
|
|
// Handle #[should_panic(expected = "foo")]
|
|
Some(list) => {
|
|
let msg = list
|
|
.iter()
|
|
.find(|mi| mi.has_name(sym::expected))
|
|
.and_then(|mi| mi.meta_item())
|
|
.and_then(|mi| mi.value_str());
|
|
if list.len() != 1 || msg.is_none() {
|
|
sd.struct_span_warn(
|
|
attr.span,
|
|
"argument must be of the form: \
|
|
`expected = \"error message\"`",
|
|
)
|
|
.note(
|
|
"errors in this attribute were erroneously \
|
|
allowed and will become a hard error in a \
|
|
future release",
|
|
)
|
|
.emit();
|
|
ShouldPanic::Yes(None)
|
|
} else {
|
|
ShouldPanic::Yes(msg)
|
|
}
|
|
}
|
|
// Handle #[should_panic] and #[should_panic = "expected"]
|
|
None => ShouldPanic::Yes(attr.value_str()),
|
|
}
|
|
}
|
|
None => ShouldPanic::No,
|
|
}
|
|
}
|
|
|
|
enum TestType {
|
|
UnitTest,
|
|
IntegrationTest,
|
|
Unknown,
|
|
}
|
|
|
|
/// Attempts to determine the type of test.
|
|
/// Since doctests are created without macro expanding, only possible variants here
|
|
/// are `UnitTest`, `IntegrationTest` or `Unknown`.
|
|
fn test_type(cx: &ExtCtxt<'_>) -> TestType {
|
|
// Root path from context contains the topmost sources directory of the crate.
|
|
// I.e., for `project` with sources in `src` and tests in `tests` folders
|
|
// (no matter how many nested folders lie inside),
|
|
// there will be two different root paths: `/project/src` and `/project/tests`.
|
|
let crate_path = cx.root_path.as_path();
|
|
|
|
if crate_path.ends_with("src") {
|
|
// `/src` folder contains unit-tests.
|
|
TestType::UnitTest
|
|
} else if crate_path.ends_with("tests") {
|
|
// `/tests` folder contains integration tests.
|
|
TestType::IntegrationTest
|
|
} else {
|
|
// Crate layout doesn't match expected one, test type is unknown.
|
|
TestType::Unknown
|
|
}
|
|
}
|
|
|
|
fn has_test_signature(cx: &ExtCtxt<'_>, i: &ast::Item) -> bool {
|
|
let has_should_panic_attr = attr::contains_name(&i.attrs, sym::should_panic);
|
|
let sd = &cx.sess.parse_sess.span_diagnostic;
|
|
match &i.kind {
|
|
ast::ItemKind::Fn(box ast::Fn { sig, generics, .. }) => {
|
|
if let ast::Unsafe::Yes(span) = sig.header.unsafety {
|
|
sd.struct_span_err(i.span, "unsafe functions cannot be used for tests")
|
|
.span_label(span, "`unsafe` because of this")
|
|
.emit();
|
|
return false;
|
|
}
|
|
if let ast::Async::Yes { span, .. } = sig.header.asyncness {
|
|
sd.struct_span_err(i.span, "async functions cannot be used for tests")
|
|
.span_label(span, "`async` because of this")
|
|
.emit();
|
|
return false;
|
|
}
|
|
|
|
// If the termination trait is active, the compiler will check that the output
|
|
// type implements the `Termination` trait as `libtest` enforces that.
|
|
let has_output = match &sig.decl.output {
|
|
ast::FnRetTy::Default(..) => false,
|
|
ast::FnRetTy::Ty(t) if t.kind.is_unit() => false,
|
|
_ => true,
|
|
};
|
|
|
|
if !sig.decl.inputs.is_empty() {
|
|
sd.span_err(i.span, "functions used as tests can not have any arguments");
|
|
return false;
|
|
}
|
|
|
|
match (has_output, has_should_panic_attr) {
|
|
(true, true) => {
|
|
sd.span_err(i.span, "functions using `#[should_panic]` must return `()`");
|
|
false
|
|
}
|
|
(true, false) => {
|
|
if !generics.params.is_empty() {
|
|
sd.span_err(
|
|
i.span,
|
|
"functions used as tests must have signature fn() -> ()",
|
|
);
|
|
false
|
|
} else {
|
|
true
|
|
}
|
|
}
|
|
(false, _) => true,
|
|
}
|
|
}
|
|
_ => {
|
|
// should be unreachable because `is_test_fn_item` should catch all non-fn items
|
|
debug_assert!(false);
|
|
false
|
|
}
|
|
}
|
|
}
|
|
|
|
fn has_bench_signature(cx: &ExtCtxt<'_>, i: &ast::Item) -> bool {
|
|
let has_sig = match &i.kind {
|
|
// N.B., inadequate check, but we're running
|
|
// well before resolve, can't get too deep.
|
|
ast::ItemKind::Fn(box ast::Fn { sig, .. }) => sig.decl.inputs.len() == 1,
|
|
_ => false,
|
|
};
|
|
|
|
if !has_sig {
|
|
cx.sess.parse_sess.span_diagnostic.span_err(
|
|
i.span,
|
|
"functions used as benches must have \
|
|
signature `fn(&mut Bencher) -> impl Termination`",
|
|
);
|
|
}
|
|
|
|
has_sig
|
|
}
|