Merge from rust-lang/rust

Cargo.lock

@@ -1364,7 +1364,6 @@ dependencies = [
  "proc-macro-api",
  "proc-macro-test",
  "ra-ap-rustc_lexer",
- "snap",
  "span",
  "stdx",
  "syntax-bridge",
@@ -1888,12 +1887,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "snap"
-version = "1.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b6b67fb9a61334225b5b790716f609cd58395f895b3fe8b328786812a40bc3b"
-
 [[package]]
 name = "span"
 version = "0.0.0"

Cargo.toml

@@ -145,7 +145,6 @@ smallvec = { version = "1.10.0", features = [
   "const_generics",
 ] }
 smol_str = "0.3.2"
-snap = "1.1.0"
 text-size = "1.1.1"
 tracing = "0.1.40"
 tracing-tree = "0.3.0"

crates/hir-ty/src/layout.rs

@@ -6,7 +6,7 @@ use base_db::ra_salsa::Cycle;
 use chalk_ir::{AdtId, FloatTy, IntTy, TyKind, UintTy};
 use hir_def::{
     layout::{
-        Abi, FieldsShape, Float, Integer, LayoutCalculator, LayoutCalculatorError, LayoutData,
+        BackendRepr, FieldsShape, Float, Integer, LayoutCalculator, LayoutCalculatorError, LayoutData,
         Primitive, ReprOptions, Scalar, Size, StructKind, TargetDataLayout, WrappingRange,
     },
     LocalFieldId, StructId,
@@ -168,7 +168,7 @@ fn layout_of_simd_ty(
 
     // Compute the ABI of the element type:
     let e_ly = db.layout_of_ty(e_ty, env)?;
-    let Abi::Scalar(e_abi) = e_ly.abi else {
+    let BackendRepr::Scalar(e_abi) = e_ly.backend_repr else {
         return Err(LayoutError::Unknown);
     };
 
@@ -190,7 +190,7 @@ fn layout_of_simd_ty(
     Ok(Arc::new(Layout {
         variants: Variants::Single { index: struct_variant_idx() },
         fields,
-        abi: Abi::Vector { element: e_abi, count: e_len },
+        backend_repr: BackendRepr::Vector { element: e_abi, count: e_len },
         largest_niche: e_ly.largest_niche,
         size,
         align,
@@ -294,10 +294,10 @@ pub fn layout_of_ty_query(
                 .checked_mul(count, dl)
                 .ok_or(LayoutError::BadCalc(LayoutCalculatorError::SizeOverflow))?;
 
-            let abi = if count != 0 && matches!(element.abi, Abi::Uninhabited) {
-                Abi::Uninhabited
+            let backend_repr = if count != 0 && matches!(element.backend_repr, BackendRepr::Uninhabited) {
+                BackendRepr::Uninhabited
             } else {
-                Abi::Aggregate { sized: true }
+                BackendRepr::Memory { sized: true }
             };
 
             let largest_niche = if count != 0 { element.largest_niche } else { None };
@@ -305,7 +305,7 @@ pub fn layout_of_ty_query(
             Layout {
                 variants: Variants::Single { index: struct_variant_idx() },
                 fields: FieldsShape::Array { stride: element.size, count },
-                abi,
+                backend_repr,
                 largest_niche,
                 align: element.align,
                 size,
@@ -318,7 +318,7 @@ pub fn layout_of_ty_query(
             Layout {
                 variants: Variants::Single { index: struct_variant_idx() },
                 fields: FieldsShape::Array { stride: element.size, count: 0 },
-                abi: Abi::Aggregate { sized: false },
+                backend_repr: BackendRepr::Memory { sized: false },
                 largest_niche: None,
                 align: element.align,
                 size: Size::ZERO,
@@ -329,7 +329,7 @@ pub fn layout_of_ty_query(
         TyKind::Str => Layout {
             variants: Variants::Single { index: struct_variant_idx() },
             fields: FieldsShape::Array { stride: Size::from_bytes(1), count: 0 },
-            abi: Abi::Aggregate { sized: false },
+            backend_repr: BackendRepr::Memory { sized: false },
             largest_niche: None,
             align: dl.i8_align,
             size: Size::ZERO,
@@ -379,8 +379,8 @@ pub fn layout_of_ty_query(
         TyKind::Never => cx.calc.layout_of_never_type(),
         TyKind::Dyn(_) | TyKind::Foreign(_) => {
             let mut unit = layout_of_unit(&cx)?;
-            match &mut unit.abi {
-                Abi::Aggregate { sized } => *sized = false,
+            match &mut unit.backend_repr {
+                BackendRepr::Memory { sized } => *sized = false,
                 _ => return Err(LayoutError::Unknown),
             }
             unit

crates/proc-macro-srv/Cargo.toml

@@ -16,7 +16,6 @@ doctest = false
 object.workspace = true
 libloading.workspace = true
 memmap2.workspace = true
-snap.workspace = true
 
 stdx.workspace = true
 tt.workspace = true

crates/proc-macro-srv/src/dylib/version.rs

@@ -8,7 +8,6 @@ use std::{
 use memmap2::Mmap;
 use object::read::{File as BinaryFile, Object, ObjectSection};
 use paths::AbsPath;
-use snap::read::FrameDecoder as SnapDecoder;
 
 #[derive(Debug)]
 #[allow(dead_code)]
@@ -123,9 +122,8 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result<String> {
     let version = u32::from_be_bytes([dot_rustc[4], dot_rustc[5], dot_rustc[6], dot_rustc[7]]);
     // Last supported version is:
     // https://github.com/rust-lang/rust/commit/b94cfefc860715fb2adf72a6955423d384c69318
-    let (snappy_portion, bytes_before_version) = match version {
-        5 | 6 => (&dot_rustc[8..], 13),
-        7 | 8 => {
+    let (mut metadata_portion, bytes_before_version) = match version {
+        8 => {
             let len_bytes = &dot_rustc[8..12];
             let data_len = u32::from_be_bytes(len_bytes.try_into().unwrap()) as usize;
             (&dot_rustc[12..data_len + 12], 13)
@@ -143,13 +141,6 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result<String> {
         }
     };
 
-    let mut uncompressed: Box<dyn Read> = if &snappy_portion[0..4] == b"rust" {
-        // Not compressed.
-        Box::new(snappy_portion)
-    } else {
-        Box::new(SnapDecoder::new(snappy_portion))
-    };
-
     // We're going to skip over the bytes before the version string, so basically:
     // 8 bytes for [b'r',b'u',b's',b't',0,0,0,5]
     // 4 or 8 bytes for [crate root bytes]
@@ -157,11 +148,11 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result<String> {
     // so 13 or 17 bytes in total, and we should check the last of those bytes
     // to know the length
     let mut bytes = [0u8; 17];
-    uncompressed.read_exact(&mut bytes[..bytes_before_version])?;
+    metadata_portion.read_exact(&mut bytes[..bytes_before_version])?;
     let length = bytes[bytes_before_version - 1];
 
     let mut version_string_utf8 = vec![0u8; length as usize];
-    uncompressed.read_exact(&mut version_string_utf8)?;
+    metadata_portion.read_exact(&mut version_string_utf8)?;
     let version_string = String::from_utf8(version_string_utf8);
     version_string.map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))
 }