Rollup merge of #114562 - Trolldemorted:thiscall, r=oli-obk

stabilize abi_thiscall

Closes https://github.com/rust-lang/rust/issues/42202, stabilizing the use of the "thiscall" ABI.

FCP was substituted by a poll, and the poll has been accepted.

compiler/rustc_feature/src/accepted.rs

@@ -53,6 +53,8 @@
     /// Allows the sysV64 ABI to be specified on all platforms
     /// instead of just the platforms on which it is the C ABI.
     (accepted, abi_sysv64, "1.24.0", Some(36167), None),
+    /// Allows using the `thiscall` ABI.
+    (accepted, abi_thiscall, "1.19.0", None, None),
     /// Allows using ADX intrinsics from `core::arch::{x86, x86_64}`.
     (accepted, adx_target_feature, "1.61.0", Some(44839), None),
     /// Allows explicit discriminants on non-unit enum variants.

compiler/rustc_feature/src/active.rs

@@ -156,8 +156,6 @@ pub fn set(&self, features: &mut Features, span: Span) {
     // -------------------------------------------------------------------------
     // no-tracking-issue-start
 
-    /// Allows using the `thiscall` ABI.
-    (active, abi_thiscall, "1.19.0", None, None),
     /// Allows using the `unadjusted` ABI; perma-unstable.
     (active, abi_unadjusted, "1.16.0", None, None),
     /// Allows using the `vectorcall` ABI.

compiler/rustc_target/src/spec/abi.rs

@@ -150,7 +150,8 @@ pub fn is_stable(name: &str) -> Result<(), AbiDisabled> {
         // Stable
         "Rust" | "C" | "C-unwind" | "cdecl" | "cdecl-unwind" | "stdcall" | "stdcall-unwind"
         | "fastcall" | "fastcall-unwind" | "aapcs" | "aapcs-unwind" | "win64" | "win64-unwind"
-        | "sysv64" | "sysv64-unwind" | "system" | "system-unwind" | "efiapi" => Ok(()),
+        | "sysv64" | "sysv64-unwind" | "system" | "system-unwind" | "efiapi" | "thiscall"
+        | "thiscall-unwind" => Ok(()),
         "rust-intrinsic" => Err(AbiDisabled::Unstable {
             feature: sym::intrinsics,
             explain: "intrinsics are subject to change",
@@ -167,14 +168,6 @@ pub fn is_stable(name: &str) -> Result<(), AbiDisabled> {
             feature: sym::abi_vectorcall,
             explain: "vectorcall-unwind ABI is experimental and subject to change",
         }),
-        "thiscall" => Err(AbiDisabled::Unstable {
-            feature: sym::abi_thiscall,
-            explain: "thiscall is experimental and subject to change",
-        }),
-        "thiscall-unwind" => Err(AbiDisabled::Unstable {
-            feature: sym::abi_thiscall,
-            explain: "thiscall-unwind ABI is experimental and subject to change",
-        }),
         "rust-call" => Err(AbiDisabled::Unstable {
             feature: sym::unboxed_closures,
             explain: "rust-call ABI is subject to change",

library/panic_unwind/src/lib.rs

@@ -19,7 +19,7 @@
 #![feature(panic_unwind)]
 #![feature(staged_api)]
 #![feature(std_internals)]
-#![feature(abi_thiscall)]
+#![cfg_attr(bootstrap, feature(abi_thiscall))]
 #![feature(rustc_attrs)]
 #![panic_runtime]
 #![feature(panic_runtime)]

src/doc/unstable-book/src/language-features/abi-thiscall.md

-# `abi_thiscall`
-
-The tracking issue for this feature is: [#42202]
-
-[#42202]: https://github.com/rust-lang/rust/issues/42202
-
-------------------------
-
-The MSVC ABI on x86 Windows uses the `thiscall` calling convention for C++
-instance methods by default; it is identical to the usual (C) calling
-convention on x86 Windows except that the first parameter of the method,
-the `this` pointer, is passed in the ECX register.

src/tools/rust-analyzer/crates/ide-db/src/generated/lints.rs

@@ -928,22 +928,6 @@ pub fn device_function() {
         ret;
 }
 ```
-"##,
-    },
-    Lint {
-        label: "abi_thiscall",
-        description: r##"# `abi_thiscall`
-
-The tracking issue for this feature is: [#42202]
-
-[#42202]: https://github.com/rust-lang/rust/issues/42202
-
-------------------------
-
-The MSVC ABI on x86 Windows uses the `thiscall` calling convention for C++
-instance methods by default; it is identical to the usual (C) calling
-convention on x86 Windows except that the first parameter of the method,
-the `this` pointer, is passed in the ECX register.
 "##,
     },
     Lint {

tests/codegen/unwind-abis/thiscall-unwind-abi.rs

 // needs-llvm-components: x86
 // compile-flags: --target=i686-pc-windows-msvc --crate-type=rlib -Cno-prepopulate-passes
 #![no_core]
-#![feature(no_core, lang_items, c_unwind, abi_thiscall)]
+#![feature(no_core, lang_items, c_unwind)]
 #[lang="sized"]
 trait Sized { }
 

tests/ui/abi/unsupported.aarch64.stderr

 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:26:1
+  --> $DIR/unsupported.rs:25:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"amdgpu-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:28:1
+  --> $DIR/unsupported.rs:27:1
    |
 LL | extern "amdgpu-kernel" fn amdgpu() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:30:1
+  --> $DIR/unsupported.rs:29:1
    |
 LL | extern "wasm" fn wasm() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"aapcs"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:32:1
+  --> $DIR/unsupported.rs:31:1
    |
 LL | extern "aapcs" fn aapcs() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:36:1
+  --> $DIR/unsupported.rs:35:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:38:1
+  --> $DIR/unsupported.rs:37:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"x86-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:40:1
+  --> $DIR/unsupported.rs:39:1
    |
 LL | extern "x86-interrupt" fn x86() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"thiscall"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:43:1
+  --> $DIR/unsupported.rs:42:1
    |
 LL | extern "thiscall" fn thiscall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of calling convention not supported on this target
-  --> $DIR/unsupported.rs:47:1
+  --> $DIR/unsupported.rs:46:1
    |
 LL | extern "stdcall" fn stdcall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui/abi/unsupported.arm.stderr

 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:26:1
+  --> $DIR/unsupported.rs:25:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"amdgpu-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:28:1
+  --> $DIR/unsupported.rs:27:1
    |
 LL | extern "amdgpu-kernel" fn amdgpu() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:30:1
+  --> $DIR/unsupported.rs:29:1
    |
 LL | extern "wasm" fn wasm() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:36:1
+  --> $DIR/unsupported.rs:35:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:38:1
+  --> $DIR/unsupported.rs:37:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"x86-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:40:1
+  --> $DIR/unsupported.rs:39:1
    |
 LL | extern "x86-interrupt" fn x86() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"thiscall"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:43:1
+  --> $DIR/unsupported.rs:42:1
    |
 LL | extern "thiscall" fn thiscall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of calling convention not supported on this target
-  --> $DIR/unsupported.rs:47:1
+  --> $DIR/unsupported.rs:46:1
    |
 LL | extern "stdcall" fn stdcall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui/abi/unsupported.i686.stderr

 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:26:1
+  --> $DIR/unsupported.rs:25:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"amdgpu-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:28:1
+  --> $DIR/unsupported.rs:27:1
    |
 LL | extern "amdgpu-kernel" fn amdgpu() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:30:1
+  --> $DIR/unsupported.rs:29:1
    |
 LL | extern "wasm" fn wasm() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"aapcs"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:32:1
+  --> $DIR/unsupported.rs:31:1
    |
 LL | extern "aapcs" fn aapcs() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:36:1
+  --> $DIR/unsupported.rs:35:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:38:1
+  --> $DIR/unsupported.rs:37:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui/abi/unsupported.rs

@@ -15,7 +15,6 @@
     abi_ptx,
     abi_msp430_interrupt,
     abi_avr_interrupt,
-    abi_thiscall,
     abi_amdgpu_kernel,
     wasm_abi,
     abi_x86_interrupt

tests/ui/abi/unsupported.x64.stderr

 error[E0570]: `"ptx-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:26:1
+  --> $DIR/unsupported.rs:25:1
    |
 LL | extern "ptx-kernel" fn ptx() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"amdgpu-kernel"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:28:1
+  --> $DIR/unsupported.rs:27:1
    |
 LL | extern "amdgpu-kernel" fn amdgpu() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"wasm"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:30:1
+  --> $DIR/unsupported.rs:29:1
    |
 LL | extern "wasm" fn wasm() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"aapcs"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:32:1
+  --> $DIR/unsupported.rs:31:1
    |
 LL | extern "aapcs" fn aapcs() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"msp430-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:36:1
+  --> $DIR/unsupported.rs:35:1
    |
 LL | extern "msp430-interrupt" fn msp430() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"avr-interrupt"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:38:1
+  --> $DIR/unsupported.rs:37:1
    |
 LL | extern "avr-interrupt" fn avr() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0570]: `"thiscall"` is not a supported ABI for the current target
-  --> $DIR/unsupported.rs:43:1
+  --> $DIR/unsupported.rs:42:1
    |
 LL | extern "thiscall" fn thiscall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: use of calling convention not supported on this target
-  --> $DIR/unsupported.rs:47:1
+  --> $DIR/unsupported.rs:46:1
    |
 LL | extern "stdcall" fn stdcall() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui/extern/extern-thiscall.rs

 // run-pass
 // only-x86
 
-#![feature(abi_thiscall)]
-
 trait A {
     extern "thiscall" fn test1(i: i32);
 }

tests/ui/feature-gates/feature-gate-thiscall.rs

-// gate-test-abi_thiscall
-// needs-llvm-components: x86
-// compile-flags: --target=i686-pc-windows-msvc --crate-type=rlib
-#![no_core]
-#![feature(no_core, lang_items)]
-#[lang="sized"]
-trait Sized { }
-
-// Test that the "thiscall" ABI is feature-gated, and cannot be used when
-// the `abi_thiscall` feature gate is not used.
-
-extern "thiscall-unwind" fn fu() {} //~ ERROR thiscall-unwind ABI is experimental
-extern "thiscall" fn f() {} //~ ERROR thiscall is experimental
-
-trait T {
-    extern "thiscall" fn m(); //~ ERROR thiscall is experimental
-    extern "thiscall-unwind" fn mu(); //~ ERROR thiscall-unwind ABI is experimental
-
-    extern "thiscall" fn dm() {} //~ ERROR thiscall is experimental
-    extern "thiscall-unwind" fn dmu() {} //~ ERROR thiscall-unwind ABI is experimental
-}
-
-struct S;
-impl T for S {
-    extern "thiscall" fn m() {} //~ ERROR thiscall is experimental
-    extern "thiscall-unwind" fn mu() {} //~ ERROR thiscall-unwind ABI is experimental
-}
-
-impl S {
-    extern "thiscall" fn im() {} //~ ERROR thiscall is experimental
-    extern "thiscall-unwind" fn imu() {} //~ ERROR thiscall-unwind ABI is experimental
-}
-
-type TA = extern "thiscall" fn(); //~ ERROR thiscall is experimental
-type TAU = extern "thiscall-unwind" fn(); //~ ERROR thiscall-unwind ABI is experimental
-
-extern "thiscall" {} //~ ERROR thiscall is experimental
-extern "thiscall-unwind" {} //~ ERROR thiscall-unwind ABI is experimental

tests/ui/feature-gates/feature-gate-thiscall.stderr

-error[E0658]: thiscall-unwind ABI is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:12:8
-   |
-LL | extern "thiscall-unwind" fn fu() {}
-   |        ^^^^^^^^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:13:8
-   |
-LL | extern "thiscall" fn f() {}
-   |        ^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:16:12
-   |
-LL |     extern "thiscall" fn m();
-   |            ^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall-unwind ABI is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:17:12
-   |
-LL |     extern "thiscall-unwind" fn mu();
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:19:12
-   |
-LL |     extern "thiscall" fn dm() {}
-   |            ^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall-unwind ABI is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:20:12
-   |
-LL |     extern "thiscall-unwind" fn dmu() {}
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:25:12
-   |
-LL |     extern "thiscall" fn m() {}
-   |            ^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall-unwind ABI is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:26:12
-   |
-LL |     extern "thiscall-unwind" fn mu() {}
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:30:12
-   |
-LL |     extern "thiscall" fn im() {}
-   |            ^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall-unwind ABI is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:31:12
-   |
-LL |     extern "thiscall-unwind" fn imu() {}
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:34:18
-   |
-LL | type TA = extern "thiscall" fn();
-   |                  ^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall-unwind ABI is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:35:19
-   |
-LL | type TAU = extern "thiscall-unwind" fn();
-   |                   ^^^^^^^^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:37:8
-   |
-LL | extern "thiscall" {}
-   |        ^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error[E0658]: thiscall-unwind ABI is experimental and subject to change
-  --> $DIR/feature-gate-thiscall.rs:38:8
-   |
-LL | extern "thiscall-unwind" {}
-   |        ^^^^^^^^^^^^^^^^^
-   |
-   = help: add `#![feature(abi_thiscall)]` to the crate attributes to enable
-
-error: aborting due to 14 previous errors
-
-For more information about this error, try `rustc --explain E0658`.