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Merge #7964

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7964: Implement builtin `cfg!` macro r=jonas-schievink a=jonas-schievink

bors r+

Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
This commit is contained in:
bors[bot] 2021-03-10 18:46:58 +00:00 committed by GitHub
commit 0b96f1a047
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5 changed files with 20 additions and 2 deletions
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1
Cargo.lock generated
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@ -524,6 +524,7 @@ name = "hir_expand"
version = "0.0.0"
dependencies = [
"base_db",
"cfg",
"either",
"la-arena",
"log",

1
crates/hir_expand/Cargo.toml
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@ -16,6 +16,7 @@ rustc-hash = "1.0.0"
la-arena = { version = "0.2.0", path = "../../lib/arena" }
base_db = { path = "../base_db", version = "0.0.0" }
cfg = { path = "../cfg", version = "0.0.0" }
syntax = { path = "../syntax", version = "0.0.0" }
parser = { path = "../parser", version = "0.0.0" }
profile = { path = "../profile", version = "0.0.0" }

14
crates/hir_expand/src/builtin_macro.rs
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@ -5,6 +5,7 @@ use crate::{
};
use base_db::{AnchoredPath, FileId};
use cfg::CfgExpr;
use either::Either;
use mbe::{parse_exprs_with_sep, parse_to_token_tree, ExpandResult};
use parser::FragmentKind;
@ -97,6 +98,7 @@ register_builtin! {
(format_args_nl, FormatArgsNl) => format_args_expand,
(llvm_asm, LlvmAsm) => asm_expand,
(asm, Asm) => asm_expand,
(cfg, Cfg) => cfg_expand,
EAGER:
(compile_error, CompileError) => compile_error_expand,
@ -258,6 +260,18 @@ fn asm_expand(
ExpandResult::ok(expanded)
}
fn cfg_expand(
db: &dyn AstDatabase,
id: LazyMacroId,
tt: &tt::Subtree,
) -> ExpandResult<tt::Subtree> {
let loc = db.lookup_intern_macro(id);
let expr = CfgExpr::parse(tt);
let enabled = db.crate_graph()[loc.krate].cfg_options.check(&expr) != Some(false);
let expanded = if enabled { quote!(true) } else { quote!(false) };
ExpandResult::ok(expanded)
}
fn unquote_str(lit: &tt::Literal) -> Option<String> {
let lit = ast::make::tokens::literal(&lit.to_string());
let token = ast::String::cast(lit)?;

1
crates/hir_expand/src/name.rs
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@ -154,6 +154,7 @@ pub mod known {
macro_rules,
derive,
doc,
cfg,
cfg_attr,
// Components of known path (value or mod name)
std,

5
crates/hir_expand/src/quote.rs
View file

@ -188,8 +188,9 @@ macro_rules! impl_to_to_tokentrees {
impl_to_to_tokentrees! {
u32 => self { tt::Literal{text: self.to_string().into(), id: tt::TokenId::unspecified()} };
usize => self { tt::Literal{text: self.to_string().into(), id: tt::TokenId::unspecified()}};
i32 => self { tt::Literal{text: self.to_string().into(), id: tt::TokenId::unspecified()}};
usize => self { tt::Literal{text: self.to_string().into(), id: tt::TokenId::unspecified()} };
i32 => self { tt::Literal{text: self.to_string().into(), id: tt::TokenId::unspecified()} };
bool => self { tt::Ident{text: self.to_string().into(), id: tt::TokenId::unspecified()} };
tt::Leaf => self { self };
tt::Literal => self { self };
tt::Ident => self { self };