mirror of
https://github.com/rust-lang/rust-analyzer
synced 2025-01-15 14:43:58 +00:00
665 lines
21 KiB
Rust
665 lines
21 KiB
Rust
//! Builtin macro
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use ::tt::Span;
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use base_db::{
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span::{SpanAnchor, ROOT_ERASED_FILE_AST_ID},
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AnchoredPath, Edition, FileId,
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};
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use cfg::CfgExpr;
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use either::Either;
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use mbe::{parse_exprs_with_sep, parse_to_token_tree};
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use syntax::{
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ast::{self, AstToken},
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SmolStr,
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};
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use crate::{
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db::ExpandDatabase,
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name, quote,
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tt::{self},
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EagerCallInfo, ExpandError, ExpandResult, HirFileIdExt, MacroCallId, MacroCallLoc,
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};
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macro_rules! register_builtin {
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( LAZY: $(($name:ident, $kind: ident) => $expand:ident),* , EAGER: $(($e_name:ident, $e_kind: ident) => $e_expand:ident),* ) => {
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub enum BuiltinFnLikeExpander {
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$($kind),*
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub enum EagerExpander {
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$($e_kind),*
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}
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impl BuiltinFnLikeExpander {
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pub fn expand(
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&self,
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db: &dyn ExpandDatabase,
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id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let expander = match *self {
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$( BuiltinFnLikeExpander::$kind => $expand, )*
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};
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expander(db, id, tt)
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}
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}
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impl EagerExpander {
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pub fn expand(
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&self,
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db: &dyn ExpandDatabase,
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arg_id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let expander = match *self {
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$( EagerExpander::$e_kind => $e_expand, )*
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};
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expander(db, arg_id, tt)
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}
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}
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fn find_by_name(ident: &name::Name) -> Option<Either<BuiltinFnLikeExpander, EagerExpander>> {
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match ident {
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$( id if id == &name::name![$name] => Some(Either::Left(BuiltinFnLikeExpander::$kind)), )*
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$( id if id == &name::name![$e_name] => Some(Either::Right(EagerExpander::$e_kind)), )*
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_ => return None,
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}
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}
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};
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}
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impl EagerExpander {
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pub fn is_include(&self) -> bool {
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matches!(self, EagerExpander::Include)
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}
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}
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pub fn find_builtin_macro(
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ident: &name::Name,
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) -> Option<Either<BuiltinFnLikeExpander, EagerExpander>> {
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find_by_name(ident)
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}
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register_builtin! {
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LAZY:
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(column, Column) => line_expand,
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(file, File) => file_expand,
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(line, Line) => line_expand,
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(module_path, ModulePath) => module_path_expand,
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(assert, Assert) => assert_expand,
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(stringify, Stringify) => stringify_expand,
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(llvm_asm, LlvmAsm) => asm_expand,
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(asm, Asm) => asm_expand,
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(global_asm, GlobalAsm) => global_asm_expand,
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(cfg, Cfg) => cfg_expand,
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(core_panic, CorePanic) => panic_expand,
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(std_panic, StdPanic) => panic_expand,
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(unreachable, Unreachable) => unreachable_expand,
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(log_syntax, LogSyntax) => log_syntax_expand,
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(trace_macros, TraceMacros) => trace_macros_expand,
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(format_args, FormatArgs) => format_args_expand,
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(const_format_args, ConstFormatArgs) => format_args_expand,
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(format_args_nl, FormatArgsNl) => format_args_nl_expand,
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EAGER:
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(compile_error, CompileError) => compile_error_expand,
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(concat, Concat) => concat_expand,
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(concat_idents, ConcatIdents) => concat_idents_expand,
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(concat_bytes, ConcatBytes) => concat_bytes_expand,
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(include, Include) => include_expand,
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(include_bytes, IncludeBytes) => include_bytes_expand,
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(include_str, IncludeStr) => include_str_expand,
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(env, Env) => env_expand,
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(option_env, OptionEnv) => option_env_expand
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}
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const DOLLAR_CRATE: tt::Ident =
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tt::Ident { text: SmolStr::new_inline("$crate"), span: tt::SpanData::DUMMY };
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fn module_path_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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_tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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// Just return a dummy result.
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ExpandResult::ok(quote! { "module::path" })
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}
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fn line_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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_tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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// dummy implementation for type-checking purposes
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ExpandResult::ok(tt::Subtree {
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delimiter: tt::Delimiter::unspecified(),
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token_trees: vec![tt::TokenTree::Leaf(tt::Leaf::Literal(tt::Literal {
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text: "0u32".into(),
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span: tt::SpanData::DUMMY,
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}))],
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})
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}
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fn log_syntax_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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_tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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ExpandResult::ok(quote! {})
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}
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fn trace_macros_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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_tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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ExpandResult::ok(quote! {})
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}
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fn stringify_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let pretty = ::tt::pretty(&tt.token_trees);
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let expanded = quote! {
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#pretty
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};
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ExpandResult::ok(expanded)
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}
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fn assert_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let args = parse_exprs_with_sep(tt, ',');
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let expanded = match &*args {
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[cond, panic_args @ ..] => {
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let comma = tt::Subtree {
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delimiter: tt::Delimiter::unspecified(),
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token_trees: vec![tt::TokenTree::Leaf(tt::Leaf::Punct(tt::Punct {
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char: ',',
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spacing: tt::Spacing::Alone,
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span: tt::SpanData::DUMMY,
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}))],
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};
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let cond = cond.clone();
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let panic_args = itertools::Itertools::intersperse(panic_args.iter().cloned(), comma);
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quote! {{
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if !(#cond) {
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#DOLLAR_CRATE::panic!(##panic_args);
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}
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}}
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}
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[] => quote! {{}},
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};
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ExpandResult::ok(expanded)
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}
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fn file_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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_tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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// FIXME: RA purposefully lacks knowledge of absolute file names
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// so just return "".
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let file_name = "";
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let expanded = quote! {
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#file_name
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};
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ExpandResult::ok(expanded)
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}
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fn format_args_expand(
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db: &dyn ExpandDatabase,
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id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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format_args_expand_general(db, id, tt, "")
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}
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fn format_args_nl_expand(
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db: &dyn ExpandDatabase,
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id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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format_args_expand_general(db, id, tt, "\\n")
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}
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fn format_args_expand_general(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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tt: &tt::Subtree,
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// FIXME: Make use of this so that mir interpretation works properly
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_end_string: &str,
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) -> ExpandResult<tt::Subtree> {
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let pound = quote! {@PUNCT '#'};
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let mut tt = tt.clone();
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tt.delimiter.kind = tt::DelimiterKind::Parenthesis;
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return ExpandResult::ok(quote! {
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builtin #pound format_args #tt
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});
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}
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fn asm_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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// We expand all assembly snippets to `format_args!` invocations to get format syntax
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// highlighting for them.
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let mut literals = Vec::new();
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for tt in tt.token_trees.chunks(2) {
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match tt {
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[tt::TokenTree::Leaf(tt::Leaf::Literal(lit))]
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| [tt::TokenTree::Leaf(tt::Leaf::Literal(lit)), tt::TokenTree::Leaf(tt::Leaf::Punct(tt::Punct { char: ',', span: _, spacing: _ }))] =>
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{
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let krate = DOLLAR_CRATE.clone();
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literals.push(quote!(#krate::format_args!(#lit);));
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}
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_ => break,
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}
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}
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let pound = quote! {@PUNCT '#'};
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let expanded = quote! {
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builtin #pound asm (
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{##literals}
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)
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};
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ExpandResult::ok(expanded)
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}
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fn global_asm_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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_tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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// Expand to nothing (at item-level)
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ExpandResult::ok(quote! {})
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}
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fn cfg_expand(
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db: &dyn ExpandDatabase,
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id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let loc = db.lookup_intern_macro_call(id);
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let expr = CfgExpr::parse(tt);
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let enabled = db.crate_graph()[loc.krate].cfg_options.check(&expr) != Some(false);
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let expanded = if enabled { quote!(true) } else { quote!(false) };
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ExpandResult::ok(expanded)
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}
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fn panic_expand(
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db: &dyn ExpandDatabase,
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id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let loc: MacroCallLoc = db.lookup_intern_macro_call(id);
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// Expand to a macro call `$crate::panic::panic_{edition}`
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let mut call = if db.crate_graph()[loc.krate].edition >= Edition::Edition2021 {
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quote!(#DOLLAR_CRATE::panic::panic_2021!)
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} else {
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quote!(#DOLLAR_CRATE::panic::panic_2015!)
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};
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// Pass the original arguments
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call.token_trees.push(tt::TokenTree::Subtree(tt.clone()));
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ExpandResult::ok(call)
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}
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fn unreachable_expand(
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db: &dyn ExpandDatabase,
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id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let loc: MacroCallLoc = db.lookup_intern_macro_call(id);
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// Expand to a macro call `$crate::panic::unreachable_{edition}`
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let mut call = if db.crate_graph()[loc.krate].edition >= Edition::Edition2021 {
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quote!(#DOLLAR_CRATE::panic::unreachable_2021!)
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} else {
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quote!(#DOLLAR_CRATE::panic::unreachable_2015!)
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};
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// Pass the original arguments
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call.token_trees.push(tt::TokenTree::Subtree(tt.clone()));
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ExpandResult::ok(call)
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}
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fn unquote_str(lit: &tt::Literal) -> Option<String> {
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let lit = ast::make::tokens::literal(&lit.to_string());
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let token = ast::String::cast(lit)?;
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token.value().map(|it| it.into_owned())
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}
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fn unquote_char(lit: &tt::Literal) -> Option<char> {
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let lit = ast::make::tokens::literal(&lit.to_string());
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let token = ast::Char::cast(lit)?;
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token.value()
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}
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fn unquote_byte_string(lit: &tt::Literal) -> Option<Vec<u8>> {
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let lit = ast::make::tokens::literal(&lit.to_string());
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let token = ast::ByteString::cast(lit)?;
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token.value().map(|it| it.into_owned())
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}
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fn compile_error_expand(
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_db: &dyn ExpandDatabase,
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_id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let err = match &*tt.token_trees {
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[tt::TokenTree::Leaf(tt::Leaf::Literal(it))] => match unquote_str(it) {
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Some(unquoted) => ExpandError::other(unquoted),
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None => ExpandError::other("`compile_error!` argument must be a string"),
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},
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_ => ExpandError::other("`compile_error!` argument must be a string"),
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};
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ExpandResult { value: quote! {}, err: Some(err) }
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}
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fn concat_expand(
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_db: &dyn ExpandDatabase,
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_arg_id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let mut err = None;
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let mut text = String::new();
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for (i, mut t) in tt.token_trees.iter().enumerate() {
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// FIXME: hack on top of a hack: `$e:expr` captures get surrounded in parentheses
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// to ensure the right parsing order, so skip the parentheses here. Ideally we'd
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// implement rustc's model. cc https://github.com/rust-lang/rust-analyzer/pull/10623
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if let tt::TokenTree::Subtree(tt::Subtree { delimiter: delim, token_trees }) = t {
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if let [tt] = &**token_trees {
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if delim.kind == tt::DelimiterKind::Parenthesis {
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t = tt;
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}
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}
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}
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match t {
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tt::TokenTree::Leaf(tt::Leaf::Literal(it)) if i % 2 == 0 => {
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// concat works with string and char literals, so remove any quotes.
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// It also works with integer, float and boolean literals, so just use the rest
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// as-is.
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if let Some(c) = unquote_char(it) {
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text.push(c);
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} else {
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let component = unquote_str(it).unwrap_or_else(|| it.text.to_string());
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text.push_str(&component);
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}
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}
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// handle boolean literals
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tt::TokenTree::Leaf(tt::Leaf::Ident(id))
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if i % 2 == 0 && (id.text == "true" || id.text == "false") =>
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{
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text.push_str(id.text.as_str());
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}
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tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) if i % 2 == 1 && punct.char == ',' => (),
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_ => {
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err.get_or_insert(mbe::ExpandError::UnexpectedToken.into());
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}
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}
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}
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ExpandResult { value: quote!(#text), err }
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}
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fn concat_bytes_expand(
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_db: &dyn ExpandDatabase,
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_arg_id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let mut bytes = Vec::new();
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let mut err = None;
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for (i, t) in tt.token_trees.iter().enumerate() {
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match t {
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tt::TokenTree::Leaf(tt::Leaf::Literal(lit)) => {
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let token = ast::make::tokens::literal(&lit.to_string());
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match token.kind() {
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syntax::SyntaxKind::BYTE => bytes.push(token.text().to_string()),
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syntax::SyntaxKind::BYTE_STRING => {
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let components = unquote_byte_string(lit).unwrap_or_default();
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components.into_iter().for_each(|it| bytes.push(it.to_string()));
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}
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_ => {
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err.get_or_insert(mbe::ExpandError::UnexpectedToken.into());
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break;
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}
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}
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}
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tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) if i % 2 == 1 && punct.char == ',' => (),
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tt::TokenTree::Subtree(tree) if tree.delimiter.kind == tt::DelimiterKind::Bracket => {
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if let Err(e) = concat_bytes_expand_subtree(tree, &mut bytes) {
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err.get_or_insert(e);
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break;
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}
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}
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_ => {
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err.get_or_insert(mbe::ExpandError::UnexpectedToken.into());
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break;
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}
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}
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}
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let ident = tt::Ident { text: bytes.join(", ").into(), span: tt::SpanData::DUMMY };
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ExpandResult { value: quote!([#ident]), err }
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}
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fn concat_bytes_expand_subtree(
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tree: &tt::Subtree,
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bytes: &mut Vec<String>,
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) -> Result<(), ExpandError> {
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for (ti, tt) in tree.token_trees.iter().enumerate() {
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match tt {
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tt::TokenTree::Leaf(tt::Leaf::Literal(lit)) => {
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let lit = ast::make::tokens::literal(&lit.to_string());
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match lit.kind() {
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syntax::SyntaxKind::BYTE | syntax::SyntaxKind::INT_NUMBER => {
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bytes.push(lit.text().to_string())
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}
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_ => {
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return Err(mbe::ExpandError::UnexpectedToken.into());
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}
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}
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}
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tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) if ti % 2 == 1 && punct.char == ',' => (),
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_ => {
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return Err(mbe::ExpandError::UnexpectedToken.into());
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}
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}
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}
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Ok(())
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}
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fn concat_idents_expand(
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_db: &dyn ExpandDatabase,
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_arg_id: MacroCallId,
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tt: &tt::Subtree,
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) -> ExpandResult<tt::Subtree> {
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let mut err = None;
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let mut ident = String::new();
|
|
for (i, t) in tt.token_trees.iter().enumerate() {
|
|
match t {
|
|
tt::TokenTree::Leaf(tt::Leaf::Ident(id)) => {
|
|
ident.push_str(id.text.as_str());
|
|
}
|
|
tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) if i % 2 == 1 && punct.char == ',' => (),
|
|
_ => {
|
|
err.get_or_insert(mbe::ExpandError::UnexpectedToken.into());
|
|
}
|
|
}
|
|
}
|
|
let ident = tt::Ident { text: ident.into(), span: tt::SpanData::DUMMY };
|
|
ExpandResult { value: quote!(#ident), err }
|
|
}
|
|
|
|
fn relative_file(
|
|
db: &dyn ExpandDatabase,
|
|
call_id: MacroCallId,
|
|
path_str: &str,
|
|
allow_recursion: bool,
|
|
) -> Result<FileId, ExpandError> {
|
|
let call_site = call_id.as_file().original_file(db);
|
|
let path = AnchoredPath { anchor: call_site, path: path_str };
|
|
let res = db
|
|
.resolve_path(path)
|
|
.ok_or_else(|| ExpandError::other(format!("failed to load file `{path_str}`")))?;
|
|
// Prevent include itself
|
|
if res == call_site && !allow_recursion {
|
|
Err(ExpandError::other(format!("recursive inclusion of `{path_str}`")))
|
|
} else {
|
|
Ok(res)
|
|
}
|
|
}
|
|
|
|
fn parse_string(tt: &tt::Subtree) -> Result<String, ExpandError> {
|
|
tt.token_trees
|
|
.get(0)
|
|
.and_then(|tt| match tt {
|
|
tt::TokenTree::Leaf(tt::Leaf::Literal(it)) => unquote_str(it),
|
|
_ => None,
|
|
})
|
|
.ok_or(mbe::ExpandError::ConversionError.into())
|
|
}
|
|
|
|
fn include_expand(
|
|
db: &dyn ExpandDatabase,
|
|
arg_id: MacroCallId,
|
|
_tt: &tt::Subtree,
|
|
) -> ExpandResult<tt::Subtree> {
|
|
match db.include_expand(arg_id) {
|
|
Ok((res, _)) => ExpandResult::ok(res.as_ref().clone()),
|
|
Err(e) => ExpandResult::new(tt::Subtree::empty(), e),
|
|
}
|
|
}
|
|
|
|
// FIXME: Check if this is still needed now after the token map rewrite
|
|
pub(crate) fn include_arg_to_tt(
|
|
db: &dyn ExpandDatabase,
|
|
arg_id: MacroCallId,
|
|
) -> Result<(triomphe::Arc<tt::Subtree>, FileId), ExpandError> {
|
|
let loc = db.lookup_intern_macro_call(arg_id);
|
|
let Some(EagerCallInfo { arg, arg_id, .. }) = loc.eager.as_deref() else {
|
|
panic!("include_arg_to_tt called on non include macro call: {:?}", &loc.eager);
|
|
};
|
|
let path = parse_string(&arg)?;
|
|
let file_id = relative_file(db, *arg_id, &path, false)?;
|
|
|
|
// why are we not going through a SyntaxNode here?
|
|
let subtree = parse_to_token_tree(
|
|
SpanAnchor { file_id, ast_id: ROOT_ERASED_FILE_AST_ID },
|
|
&db.file_text(file_id),
|
|
)
|
|
.ok_or(mbe::ExpandError::ConversionError)?;
|
|
Ok((triomphe::Arc::new(subtree), file_id))
|
|
}
|
|
|
|
fn include_bytes_expand(
|
|
_db: &dyn ExpandDatabase,
|
|
_arg_id: MacroCallId,
|
|
tt: &tt::Subtree,
|
|
) -> ExpandResult<tt::Subtree> {
|
|
if let Err(e) = parse_string(tt) {
|
|
return ExpandResult::new(tt::Subtree::empty(), e);
|
|
}
|
|
|
|
// FIXME: actually read the file here if the user asked for macro expansion
|
|
let res = tt::Subtree {
|
|
delimiter: tt::Delimiter::unspecified(),
|
|
token_trees: vec![tt::TokenTree::Leaf(tt::Leaf::Literal(tt::Literal {
|
|
text: r#"b"""#.into(),
|
|
span: tt::SpanData::DUMMY,
|
|
}))],
|
|
};
|
|
ExpandResult::ok(res)
|
|
}
|
|
|
|
fn include_str_expand(
|
|
db: &dyn ExpandDatabase,
|
|
arg_id: MacroCallId,
|
|
tt: &tt::Subtree,
|
|
) -> ExpandResult<tt::Subtree> {
|
|
let path = match parse_string(tt) {
|
|
Ok(it) => it,
|
|
Err(e) => return ExpandResult::new(tt::Subtree::empty(), e),
|
|
};
|
|
|
|
// FIXME: we're not able to read excluded files (which is most of them because
|
|
// it's unusual to `include_str!` a Rust file), but we can return an empty string.
|
|
// Ideally, we'd be able to offer a precise expansion if the user asks for macro
|
|
// expansion.
|
|
let file_id = match relative_file(db, arg_id, &path, true) {
|
|
Ok(file_id) => file_id,
|
|
Err(_) => {
|
|
return ExpandResult::ok(quote!(""));
|
|
}
|
|
};
|
|
|
|
let text = db.file_text(file_id);
|
|
let text = &*text;
|
|
|
|
ExpandResult::ok(quote!(#text))
|
|
}
|
|
|
|
fn get_env_inner(db: &dyn ExpandDatabase, arg_id: MacroCallId, key: &str) -> Option<String> {
|
|
let krate = db.lookup_intern_macro_call(arg_id).krate;
|
|
db.crate_graph()[krate].env.get(key)
|
|
}
|
|
|
|
fn env_expand(
|
|
db: &dyn ExpandDatabase,
|
|
arg_id: MacroCallId,
|
|
tt: &tt::Subtree,
|
|
) -> ExpandResult<tt::Subtree> {
|
|
let key = match parse_string(tt) {
|
|
Ok(it) => it,
|
|
Err(e) => return ExpandResult::new(tt::Subtree::empty(), e),
|
|
};
|
|
|
|
let mut err = None;
|
|
let s = get_env_inner(db, arg_id, &key).unwrap_or_else(|| {
|
|
// The only variable rust-analyzer ever sets is `OUT_DIR`, so only diagnose that to avoid
|
|
// unnecessary diagnostics for eg. `CARGO_PKG_NAME`.
|
|
if key == "OUT_DIR" {
|
|
err = Some(ExpandError::other(r#"`OUT_DIR` not set, enable "build scripts" to fix"#));
|
|
}
|
|
|
|
// If the variable is unset, still return a dummy string to help type inference along.
|
|
// We cannot use an empty string here, because for
|
|
// `include!(concat!(env!("OUT_DIR"), "/foo.rs"))` will become
|
|
// `include!("foo.rs"), which might go to infinite loop
|
|
"UNRESOLVED_ENV_VAR".to_string()
|
|
});
|
|
let expanded = quote! { #s };
|
|
|
|
ExpandResult { value: expanded, err }
|
|
}
|
|
|
|
fn option_env_expand(
|
|
db: &dyn ExpandDatabase,
|
|
arg_id: MacroCallId,
|
|
tt: &tt::Subtree,
|
|
) -> ExpandResult<tt::Subtree> {
|
|
let key = match parse_string(tt) {
|
|
Ok(it) => it,
|
|
Err(e) => return ExpandResult::new(tt::Subtree::empty(), e),
|
|
};
|
|
// FIXME: Use `DOLLAR_CRATE` when that works in eager macros.
|
|
let expanded = match get_env_inner(db, arg_id, &key) {
|
|
None => quote! { ::core::option::Option::None::<&str> },
|
|
Some(s) => quote! { ::core::option::Option::Some(#s) },
|
|
};
|
|
|
|
ExpandResult::ok(expanded)
|
|
}
|