rustdoc-json: Better Header Type

- Make ABI an enum, instead of being stringly typed
- Replace Qualifier HashSet with 3 bools
- Merge ABI field into header, as they always occor together

compiler/rustc_hir/src/hir.rs

@@ -2777,6 +2777,10 @@ impl FnHeader {
     pub fn is_const(&self) -> bool {
         matches!(&self.constness, Constness::Const)
     }
+
+    pub fn is_unsafe(&self) -> bool {
+        matches!(&self.unsafety, Unsafety::Unsafe)
+    }
 }
 
 #[derive(Debug, HashStable_Generic)]

src/librustdoc/json/conversions.rs

@@ -12,6 +12,7 @@ use rustc_hir::{def::CtorKind, def_id::DefId};
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_span::def_id::CRATE_DEF_INDEX;
 use rustc_span::Pos;
+use rustc_target::spec::abi::Abi as RustcAbi;
 
 use rustdoc_json_types::*;
 
@@ -19,7 +20,6 @@ use crate::clean::utils::print_const_expr;
 use crate::clean::{self, ItemId};
 use crate::formats::item_type::ItemType;
 use crate::json::JsonRenderer;
-use std::collections::HashSet;
 
 impl JsonRenderer<'_> {
     pub(super) fn convert_item(&self, item: clean::Item) -> Option<Item> {
@@ -271,22 +271,28 @@ crate fn from_ctor_kind(struct_type: CtorKind) -> StructType {
     }
 }
 
-crate fn from_fn_header(header: &rustc_hir::FnHeader) -> HashSet<Qualifiers> {
-    let mut v = HashSet::new();
-
-    if let rustc_hir::Unsafety::Unsafe = header.unsafety {
-        v.insert(Qualifiers::Unsafe);
+crate fn from_fn_header(header: &rustc_hir::FnHeader) -> Header {
+    Header {
+        async_: header.is_async(),
+        const_: header.is_const(),
+        unsafe_: header.is_unsafe(),
+        abi: convert_abi(header.abi),
     }
+}
 
-    if let rustc_hir::IsAsync::Async = header.asyncness {
-        v.insert(Qualifiers::Async);
+fn convert_abi(a: RustcAbi) -> Abi {
+    match a {
+        RustcAbi::Rust => Abi::Rust,
+        RustcAbi::C { unwind } => Abi::C { unwind },
+        RustcAbi::Cdecl { unwind } => Abi::Cdecl { unwind },
+        RustcAbi::Stdcall { unwind } => Abi::Stdcall { unwind },
+        RustcAbi::Fastcall { unwind } => Abi::Fastcall { unwind },
+        RustcAbi::Aapcs { unwind } => Abi::Aapcs { unwind },
+        RustcAbi::Win64 { unwind } => Abi::Win64 { unwind },
+        RustcAbi::SysV64 { unwind } => Abi::SysV64 { unwind },
+        RustcAbi::System { unwind } => Abi::System { unwind },
+        _ => Abi::Other(a.to_string()),
     }
-
-    if let rustc_hir::Constness::Const = header.constness {
-        v.insert(Qualifiers::Const);
-    }
-
-    v
 }
 
 impl FromWithTcx<clean::Function> for Function {
@@ -296,7 +302,6 @@ impl FromWithTcx<clean::Function> for Function {
             decl: decl.into_tcx(tcx),
             generics: generics.into_tcx(tcx),
             header: from_fn_header(&header),
-            abi: header.abi.to_string(),
         }
     }
 }
@@ -465,16 +470,14 @@ impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
         FunctionPointer {
-            header: if let rustc_hir::Unsafety::Unsafe = unsafety {
-                let mut hs = HashSet::new();
-                hs.insert(Qualifiers::Unsafe);
-                hs
-            } else {
-                HashSet::new()
+            header: Header {
+                unsafe_: matches!(unsafety, rustc_hir::Unsafety::Unsafe),
+                const_: false,
+                async_: false,
+                abi: convert_abi(abi),
             },
             generic_params: generic_params.into_iter().map(|x| x.into_tcx(tcx)).collect(),
             decl: decl.into_tcx(tcx),
-            abi: abi.to_string(),
         }
     }
 }
@@ -554,7 +557,6 @@ crate fn from_function_method(
         decl: decl.into_tcx(tcx),
         generics: generics.into_tcx(tcx),
         header: from_fn_header(&header),
-        abi: header.abi.to_string(),
         has_body,
     }
 }

src/rustdoc-json-types/lib.rs

@@ -3,13 +3,13 @@
 //! These types are the public API exposed through the `--output-format json` flag. The [`Crate`]
 //! struct is the root of the JSON blob and all other items are contained within.
 
-use std::collections::{HashMap, HashSet};
+use std::collections::HashMap;
 use std::path::PathBuf;
 
 use serde::{Deserialize, Serialize};
 
 /// rustdoc format-version.
-pub const FORMAT_VERSION: u32 = 10;
+pub const FORMAT_VERSION: u32 = 11;
 
 /// A `Crate` is the root of the emitted JSON blob. It contains all type/documentation information
 /// about the language items in the local crate, as well as info about external items to allow
@@ -287,29 +287,45 @@ pub enum StructType {
     Unit,
 }
 
-#[non_exhaustive]
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq, Hash)]
-#[serde(rename_all = "snake_case")]
-pub enum Qualifiers {
-    Const,
-    Unsafe,
-    Async,
+pub struct Header {
+    #[serde(rename = "const")]
+    pub const_: bool,
+    #[serde(rename = "unsafe")]
+    pub unsafe_: bool,
+    #[serde(rename = "async")]
+    pub async_: bool,
+    pub abi: Abi,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq, Hash)]
+pub enum Abi {
+    // We only have a concrete listing here for stable ABI's because their are so many
+    // See rustc_ast_passes::feature_gate::PostExpansionVisitor::check_abi for the list
+    Rust,
+    C { unwind: bool },
+    Cdecl { unwind: bool },
+    Stdcall { unwind: bool },
+    Fastcall { unwind: bool },
+    Aapcs { unwind: bool },
+    Win64 { unwind: bool },
+    SysV64 { unwind: bool },
+    System { unwind: bool },
+    Other(String),
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
 pub struct Function {
     pub decl: FnDecl,
     pub generics: Generics,
-    pub header: HashSet<Qualifiers>,
-    pub abi: String,
+    pub header: Header,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
 pub struct Method {
     pub decl: FnDecl,
     pub generics: Generics,
-    pub header: HashSet<Qualifiers>,
-    pub abi: String,
+    pub header: Header,
     pub has_body: bool,
 }
 
@@ -426,8 +442,7 @@ pub enum Type {
 pub struct FunctionPointer {
     pub decl: FnDecl,
     pub generic_params: Vec<GenericParamDef>,
-    pub header: HashSet<Qualifiers>,
-    pub abi: String,
+    pub header: Header,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]