Merging upstream version 126.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

12 files changed, 181 insertions, 32 deletions

diff --git a/third_party/rust/wast/.cargo-checksum.json b/third_party/rust/wast/.cargo-checksum.json
index bc41b948df..3852650553 100644
--- a/third_party/rust/wast/.cargo-checksum.json
+++ b/third_party/rust/wast/.cargo-checksum.json
@@ -1 +1 @@
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l/string5.wat":"386cf314bb05acdaaabdf4da1caf140167271a26bd08bf34c3a7427d4bc4431f","tests/parse-fail/string5.wat.err":"1e56b44a23a37b2b2ad05aa9dd7e1e18191b5cc22151f93bbcf9d618779a57bd","tests/parse-fail/string6.wat":"8f1fe2825ff96f2acee9130a7721f86fcc93c221baa9411bf1fb6f0870d38ccb","tests/parse-fail/string6.wat.err":"d55dfd84d94e893f167ae73b7a080aefb2bfb05cc8a1ec201c4d3066fb8549b4","tests/parse-fail/string7.wat":"b12f8c75313d7f834489d3c353422f90bc945b37139586446eda82e334a97cde","tests/parse-fail/string7.wat.err":"4cee0ca61992c249dd0faaf2529a073cf8deeb36111a3f69b43695e5682560a2","tests/parse-fail/string8.wat":"4c2e0e1f883bb4e8cba9313497ed792130e5848e62bde7716102788d7467be10","tests/parse-fail/string8.wat.err":"840c6def7c60dd7c2b7261549cab435ba78c9b3a937adf6d5d9595ff8af01c91","tests/parse-fail/string9.wat":"2b7670caed2b0688d535de6e4e416f35fa717cfbe096a6cc764a669085c8f52f","tests/parse-fail/string9.wat.err":"37b5a9c3af9631500f31f9e5e3efa821b8d96063c57d60fd01df6be6a5c323e1","tests/parse-fail/unbalanced.wat":"f664fbef53a0308f864ba496d38044eb90482636e32586512939d4930729f3fe","tests/parse-fail/unbalanced.wat.err":"aba579f7b836856e69afe05da8328aabe0643d94e369898e686aa7bb0b07e9c9","tests/recursive.rs":"ad8a2b07bf955121a7c9e326ed35f9b2bc56b440c8cc0bbde24d423a79945c1a"},"package":"1ef6e1ef34d7da3e2b374fd2b1a9c0227aff6cad596e1b24df9b58d0f6222faa"}
\ No newline at end of file
diff --git a/third_party/rust/wast/Cargo.toml b/third_party/rust/wast/Cargo.toml
index e2ac927aa5..7f2d159a8b 100644
--- a/third_party/rust/wast/Cargo.toml
+++ b/third_party/rust/wast/Cargo.toml
@@ -12,7 +12,7 @@
 [package]
 edition = "2021"
 name = "wast"
-version = "70.0.1"
+version = "201.0.0"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 description = """
 Customizable Rust parsers for the WebAssembly Text formats WAT and WAST
@@ -27,6 +27,9 @@ repository = "https://github.com/bytecodealliance/wasm-tools/tree/main/crates/wa
 name = "parse-fail"
 harness = false
 
+[dependencies.bumpalo]
+version = "3.14.0"
+
 [dependencies.leb128]
 version = "0.2.4"
 
@@ -37,7 +40,7 @@ version = "2.4.1"
 version = "0.1.9"
 
 [dependencies.wasm-encoder]
-version = "0.40.0"
+version = "0.201.0"
 
 [dev-dependencies.anyhow]
 version = "1.0.58"
@@ -48,3 +51,9 @@ version = "1.3"
 [features]
 default = ["wasm-module"]
 wasm-module = []
+
+[lints.clippy]
+all = "allow"
+
+[lints.rust]
+unsafe_code = "deny"
diff --git a/third_party/rust/wast/src/component/component.rs b/third_party/rust/wast/src/component/component.rs
index f954935d87..cc9171b505 100644
--- a/third_party/rust/wast/src/component/component.rs
+++ b/third_party/rust/wast/src/component/component.rs
@@ -111,6 +111,7 @@ impl<'a> Parse<'a> for Component<'a> {
         let _r = parser.register_annotation("custom");
         let _r = parser.register_annotation("producers");
         let _r = parser.register_annotation("name");
+        let _r = parser.register_annotation("metadata.code.branch_hint");
 
         let span = parser.parse::<kw::component>()?.0;
         let id = parser.parse()?;
diff --git a/third_party/rust/wast/src/core/binary.rs b/third_party/rust/wast/src/core/binary.rs
index 68facd6431..da94da0241 100644
--- a/third_party/rust/wast/src/core/binary.rs
+++ b/third_party/rust/wast/src/core/binary.rs
@@ -69,7 +69,7 @@ pub fn encode(
     if needs_data_count(&funcs) {
         e.section(12, &data.len());
     }
-    e.section_list(10, Code, &funcs);
+    e.code_section(&funcs, &imports);
     e.section_list(11, Data, &data);
 
     let names = find_names(module_id, module_name, fields);
@@ -121,6 +121,47 @@ impl Encoder<'_> {
         }
         self.custom_sections(CustomPlace::After(anchor));
     }
+
+    /// Encodes the code section of a wasm module module while additionally
+    /// handling the branch hinting proposal.
+    ///
+    /// The branch hinting proposal requires to encode the offsets of the
+    /// instructions relative from the beginning of the function. Here we encode
+    /// each instruction and we save its offset. If needed, we use this
+    /// information to build the branch hint section and insert it before the
+    /// code section.
+    fn code_section<'a>(&'a mut self, list: &[&'a Func<'_>], imports: &[&Import<'_>]) {
+        self.custom_sections(CustomPlace::Before(CustomPlaceAnchor::Code));
+
+        if !list.is_empty() {
+            let mut branch_hints = Vec::new();
+            let mut code_section = Vec::new();
+
+            list.len().encode(&mut code_section);
+            let mut func_index = imports
+                .iter()
+                .filter(|i| matches!(i.item.kind, ItemKind::Func(..)))
+                .count() as u32;
+            for func in list.iter() {
+                let hints = func.encode(&mut code_section);
+                if !hints.is_empty() {
+                    branch_hints.push(FunctionBranchHints { func_index, hints });
+                }
+                func_index += 1;
+            }
+
+            // Branch hints section has to be inserted before the Code section
+            // Insert the section only if we have some hints
+            if !branch_hints.is_empty() {
+                self.section(0, &("metadata.code.branch_hint", branch_hints));
+            }
+
+            // Finally, insert the Code section from the tmp buffer
+            self.wasm.push(10);
+            code_section.encode(&mut self.wasm);
+        }
+        self.custom_sections(CustomPlace::After(CustomPlaceAnchor::Code));
+    }
 }
 
 impl Encode for FunctionType<'_> {
@@ -475,7 +516,7 @@ impl Encode for Table<'_> {
                 e.push(0x40);
                 e.push(0x00);
                 ty.encode(e);
-                init_expr.encode(e);
+                init_expr.encode(e, 0);
             }
             _ => panic!("TableKind should be normal during encoding"),
         }
@@ -497,7 +538,9 @@ impl Encode for Global<'_> {
         assert!(self.exports.names.is_empty());
         self.ty.encode(e);
         match &self.kind {
-            GlobalKind::Inline(expr) => expr.encode(e),
+            GlobalKind::Inline(expr) => {
+                let _hints = expr.encode(e, 0);
+            }
             _ => panic!("GlobalKind should be inline during encoding"),
         }
     }
@@ -534,7 +577,7 @@ impl Encode for Elem<'_> {
                 ElemPayload::Indices(_),
             ) => {
                 e.push(0x00);
-                offset.encode(e);
+                offset.encode(e, 0);
             }
             (ElemKind::Passive, ElemPayload::Indices(_)) => {
                 e.push(0x01); // flags
@@ -543,7 +586,7 @@ impl Encode for Elem<'_> {
             (ElemKind::Active { table, offset }, ElemPayload::Indices(_)) => {
                 e.push(0x02); // flags
                 table.encode(e);
-                offset.encode(e);
+                offset.encode(e, 0);
                 e.push(0x00); // extern_kind
             }
             (ElemKind::Declared, ElemPayload::Indices(_)) => {
@@ -565,7 +608,7 @@ impl Encode for Elem<'_> {
                 },
             ) => {
                 e.push(0x04);
-                offset.encode(e);
+                offset.encode(e, 0);
             }
             (ElemKind::Passive, ElemPayload::Exprs { ty, .. }) => {
                 e.push(0x05);
@@ -574,7 +617,7 @@ impl Encode for Elem<'_> {
             (ElemKind::Active { table, offset }, ElemPayload::Exprs { ty, .. }) => {
                 e.push(0x06);
                 table.encode(e);
-                offset.encode(e);
+                offset.encode(e, 0);
                 ty.encode(e);
             }
             (ElemKind::Declared, ElemPayload::Exprs { ty, .. }) => {
@@ -594,7 +637,7 @@ impl Encode for ElemPayload<'_> {
             ElemPayload::Exprs { exprs, ty: _ } => {
                 exprs.len().encode(e);
                 for expr in exprs {
-                    expr.encode(e);
+                    expr.encode(e, 0);
                 }
             }
         }
@@ -610,12 +653,12 @@ impl Encode for Data<'_> {
                 offset,
             } => {
                 e.push(0x00);
-                offset.encode(e);
+                offset.encode(e, 0);
             }
             DataKind::Active { memory, offset } => {
                 e.push(0x02);
                 memory.encode(e);
-                offset.encode(e);
+                offset.encode(e, 0);
             }
         }
         self.data.iter().map(|l| l.len()).sum::<usize>().encode(e);
@@ -625,20 +668,25 @@ impl Encode for Data<'_> {
     }
 }
 
-impl Encode for Func<'_> {
-    fn encode(&self, e: &mut Vec<u8>) {
+impl Func<'_> {
+    /// Encodes the function into `e` while returning all branch hints with
+    /// known relative offsets after encoding.
+    fn encode(&self, e: &mut Vec<u8>) -> Vec<BranchHint> {
         assert!(self.exports.names.is_empty());
-        let mut tmp = Vec::new();
         let (expr, locals) = match &self.kind {
             FuncKind::Inline { expression, locals } => (expression, locals),
             _ => panic!("should only have inline functions in emission"),
         };
 
+        // Encode the function into a temporary vector because functions are
+        // prefixed with their length. The temporary vector, when encoded,
+        // encodes its length first then the body.
+        let mut tmp = Vec::new();
         locals.encode(&mut tmp);
-        expr.encode(&mut tmp);
+        let branch_hints = expr.encode(&mut tmp, 0);
+        tmp.encode(e);
 
-        tmp.len().encode(e);
-        e.extend_from_slice(&tmp);
+        branch_hints
     }
 }
 
@@ -658,12 +706,25 @@ impl Encode for Box<[Local<'_>]> {
     }
 }
 
-impl Encode for Expression<'_> {
-    fn encode(&self, e: &mut Vec<u8>) {
-        for instr in self.instrs.iter() {
+// Encode the expression and store the offset from the beginning
+// for each instruction.
+impl Expression<'_> {
+    fn encode(&self, e: &mut Vec<u8>, relative_start: usize) -> Vec<BranchHint> {
+        let mut hints = Vec::with_capacity(self.branch_hints.len());
+        let mut next_hint = self.branch_hints.iter().peekable();
+
+        for (i, instr) in self.instrs.iter().enumerate() {
+            if let Some(hint) = next_hint.next_if(|h| h.instr_index == i) {
+                hints.push(BranchHint {
+                    branch_func_offset: u32::try_from(e.len() - relative_start).unwrap(),
+                    branch_hint_value: hint.value,
+                });
+            }
             instr.encode(e);
         }
         e.push(0x0b);
+
+        hints
     }
 }
 
@@ -1146,6 +1207,31 @@ impl Encode for Dylink0Subsection<'_> {
     }
 }
 
+struct FunctionBranchHints {
+    func_index: u32,
+    hints: Vec<BranchHint>,
+}
+
+struct BranchHint {
+    branch_func_offset: u32,
+    branch_hint_value: u32,
+}
+
+impl Encode for FunctionBranchHints {
+    fn encode(&self, e: &mut Vec<u8>) {
+        self.func_index.encode(e);
+        self.hints.encode(e);
+    }
+}
+
+impl Encode for BranchHint {
+    fn encode(&self, e: &mut Vec<u8>) {
+        self.branch_func_offset.encode(e);
+        1u32.encode(e);
+        self.branch_hint_value.encode(e);
+    }
+}
+
 impl Encode for Tag<'_> {
     fn encode(&self, e: &mut Vec<u8>) {
         self.ty.encode(e);
diff --git a/third_party/rust/wast/src/core/expr.rs b/third_party/rust/wast/src/core/expr.rs
index 489ac205af..b45950b896 100644
--- a/third_party/rust/wast/src/core/expr.rs
+++ b/third_party/rust/wast/src/core/expr.rs
@@ -1,3 +1,4 @@
+use crate::annotation;
 use crate::core::*;
 use crate::encode::Encode;
 use crate::kw;
@@ -14,6 +15,20 @@ use std::mem;
 #[allow(missing_docs)]
 pub struct Expression<'a> {
     pub instrs: Box<[Instruction<'a>]>,
+    pub branch_hints: Vec<BranchHint>,
+}
+
+/// A `@metadata.code.branch_hint` in the code, associated with a If or BrIf
+/// This instruction is a placeholder and won't produce anything. Its purpose
+/// is to store the offset of the following instruction and check that
+/// it's followed by `br_if` or `if`.
+#[derive(Debug)]
+pub struct BranchHint {
+    /// Index of instructions in `instrs` field of `Expression` that this hint
+    /// appplies to.
+    pub instr_index: usize,
+    /// The value of this branch hint
+    pub value: u32,
 }
 
 impl<'a> Parse<'a> for Expression<'a> {
@@ -22,6 +37,7 @@ impl<'a> Parse<'a> for Expression<'a> {
         exprs.parse(parser)?;
         Ok(Expression {
             instrs: exprs.instrs.into(),
+            branch_hints: exprs.branch_hints,
         })
     }
 }
@@ -47,6 +63,7 @@ impl<'a> Expression<'a> {
         exprs.parse_folded_instruction(parser)?;
         Ok(Expression {
             instrs: exprs.instrs.into(),
+            branch_hints: exprs.branch_hints,
         })
     }
 }
@@ -66,6 +83,11 @@ struct ExpressionParser<'a> {
     /// Descriptor of all our nested s-expr blocks. This only happens when
     /// instructions themselves are nested.
     stack: Vec<Level<'a>>,
+
+    /// Related to the branch hints proposal.
+    /// Will be used later to collect the offsets in the final binary.
+    /// <(index of branch instructions, BranchHintAnnotation)>
+    branch_hints: Vec<BranchHint>,
 }
 
 enum Paren {
@@ -89,6 +111,9 @@ enum Level<'a> {
     /// which don't correspond to terminating instructions, we're just in a
     /// nested block.
     IfArm,
+
+    /// This means we are finishing the parsing of a branch hint annotation.
+    BranchHint,
 }
 
 /// Possible states of "what is currently being parsed?" in an `if` expression.
@@ -145,6 +170,14 @@ impl<'a> ExpressionParser<'a> {
                     if self.handle_if_lparen(parser)? {
                         continue;
                     }
+
+                    // Handle the case of a branch hint annotation
+                    if parser.peek::<annotation::metadata_code_branch_hint>()? {
+                        self.parse_branch_hint(parser)?;
+                        self.stack.push(Level::BranchHint);
+                        continue;
+                    }
+
                     match parser.parse()? {
                         // If block/loop show up then we just need to be sure to
                         // push an `end` instruction whenever the `)` token is
@@ -177,6 +210,7 @@ impl<'a> ExpressionParser<'a> {
                 Paren::Right => match self.stack.pop().unwrap() {
                     Level::EndWith(i) => self.instrs.push(i),
                     Level::IfArm => {}
+                    Level::BranchHint => {}
 
                     // If an `if` statement hasn't parsed the clause or `then`
                     // block, then that's an error because there weren't enough
@@ -191,7 +225,6 @@ impl<'a> ExpressionParser<'a> {
                 },
             }
         }
-
         Ok(())
     }
 
@@ -287,6 +320,24 @@ impl<'a> ExpressionParser<'a> {
             If::Else => Err(parser.error("unexpected token: too many payloads inside of `(if)`")),
         }
     }
+
+    fn parse_branch_hint(&mut self, parser: Parser<'a>) -> Result<()> {
+        parser.parse::<annotation::metadata_code_branch_hint>()?;
+
+        let hint = parser.parse::<String>()?;
+
+        let value = match hint.as_bytes() {
+            [0] => 0,
+            [1] => 1,
+            _ => return Err(parser.error("invalid value for branch hint")),
+        };
+
+        self.branch_hints.push(BranchHint {
+            instr_index: self.instrs.len(),
+            value,
+        });
+        Ok(())
+    }
 }
 
 // TODO: document this obscenity
diff --git a/third_party/rust/wast/src/core/memory.rs b/third_party/rust/wast/src/core/memory.rs
index 3bc7345ef2..eb1baa1a95 100644
--- a/third_party/rust/wast/src/core/memory.rs
+++ b/third_party/rust/wast/src/core/memory.rs
@@ -165,6 +165,7 @@ impl<'a> Parse<'a> for Data<'a> {
                     if parser.is_empty() {
                         return Ok(Expression {
                             instrs: [insn].into(),
+                            branch_hints: Vec::new(),
                         });
                     }
 
@@ -184,6 +185,7 @@ impl<'a> Parse<'a> for Data<'a> {
                     instrs.push(insn);
                     Ok(Expression {
                         instrs: instrs.into(),
+                        branch_hints: Vec::new(),
                     })
                 }
             })?;
diff --git a/third_party/rust/wast/src/core/module.rs b/third_party/rust/wast/src/core/module.rs
index 569a8884d4..f74ce6b619 100644
--- a/third_party/rust/wast/src/core/module.rs
+++ b/third_party/rust/wast/src/core/module.rs
@@ -114,6 +114,7 @@ impl<'a> Parse<'a> for Module<'a> {
         let _r = parser.register_annotation("producers");
         let _r = parser.register_annotation("name");
         let _r = parser.register_annotation("dylink.0");
+        let _r = parser.register_annotation("metadata.code.branch_hint");
 
         let span = parser.parse::<kw::module>()?.0;
         let id = parser.parse()?;
diff --git a/third_party/rust/wast/src/core/resolve/deinline_import_export.rs b/third_party/rust/wast/src/core/resolve/deinline_import_export.rs
index c338407182..98e680b58a 100644
--- a/third_party/rust/wast/src/core/resolve/deinline_import_export.rs
+++ b/third_party/rust/wast/src/core/resolve/deinline_import_export.rs
@@ -85,6 +85,7 @@ pub fn run(fields: &mut Vec<ModuleField>) {
                                     } else {
                                         Instruction::I64Const(0)
                                     }]),
+                                    branch_hints: Vec::new(),
                                 },
                             },
                             data,
@@ -143,6 +144,7 @@ pub fn run(fields: &mut Vec<ModuleField>) {
                                 table: Index::Id(id),
                                 offset: Expression {
                                     instrs: Box::new([Instruction::I32Const(0)]),
+                                    branch_hints: Vec::new(),
                                 },
                             },
                             payload,
diff --git a/third_party/rust/wast/src/core/table.rs b/third_party/rust/wast/src/core/table.rs
index 280244498f..e7f0b0f974 100644
--- a/third_party/rust/wast/src/core/table.rs
+++ b/third_party/rust/wast/src/core/table.rs
@@ -253,6 +253,7 @@ impl<'a> ElemPayload<'a> {
                 ElemPayload::Exprs { exprs, .. } => {
                     let expr = Expression {
                         instrs: [Instruction::RefFunc(func)].into(),
+                        branch_hints: Vec::new(),
                     };
                     exprs.push(expr);
                 }
diff --git a/third_party/rust/wast/src/lib.rs b/third_party/rust/wast/src/lib.rs
index 7923a343b5..bb16574177 100644
--- a/third_party/rust/wast/src/lib.rs
+++ b/third_party/rust/wast/src/lib.rs
@@ -538,4 +538,5 @@ pub mod annotation {
     annotation!(name);
     annotation!(producers);
     annotation!(dylink_0 = "dylink.0");
+    annotation!(metadata_code_branch_hint = "metadata.code.branch_hint");
 }
diff --git a/third_party/rust/wast/src/parser.rs b/third_party/rust/wast/src/parser.rs
index 0c85923f83..7a20ebe255 100644
--- a/third_party/rust/wast/src/parser.rs
+++ b/third_party/rust/wast/src/parser.rs
@@ -65,6 +65,7 @@
 use crate::lexer::{Float, Integer, Lexer, Token, TokenKind};
 use crate::token::Span;
 use crate::Error;
+use bumpalo::Bump;
 use std::borrow::Cow;
 use std::cell::{Cell, RefCell};
 use std::collections::HashMap;
@@ -303,7 +304,7 @@ pub struct ParseBuffer<'a> {
     cur: Cell<Position>,
     known_annotations: RefCell<HashMap<String, usize>>,
     depth: Cell<usize>,
-    strings: RefCell<Vec<Box<[u8]>>>,
+    strings: Bump,
 }
 
 /// The current position within a `Lexer` that we're at. This simultaneously
@@ -396,14 +397,7 @@ impl ParseBuffer<'_> {
     /// This will return a reference to `s`, but one that's safely rooted in the
     /// `Parser`.
     fn push_str(&self, s: Vec<u8>) -> &[u8] {
-        let s = Box::from(s);
-        let ret = &*s as *const [u8];
-        self.strings.borrow_mut().push(s);
-        // This should be safe in that the address of `ret` isn't changing as
-        // it's on the heap itself. Additionally the lifetime of this return
-        // value is tied to the lifetime of `self` (nothing is deallocated
-        // early), so it should be safe to say the two have the same lifetime.
-        unsafe { &*ret }
+        self.strings.alloc_slice_copy(&s)
     }
 
     /// Lexes the next "significant" token from the `pos` specified.
diff --git a/third_party/rust/wast/src/wat.rs b/third_party/rust/wast/src/wat.rs
index f74121187d..6d9a233359 100644
--- a/third_party/rust/wast/src/wat.rs
+++ b/third_party/rust/wast/src/wat.rs
@@ -43,6 +43,7 @@ impl<'a> Parse<'a> for Wat<'a> {
         let _r = parser.register_annotation("custom");
         let _r = parser.register_annotation("producers");
         let _r = parser.register_annotation("name");
+        let _r = parser.register_annotation("metadata.code.branch_hint");
         let wat = if parser.peek2::<kw::module>()? {
             Wat::Module(parser.parens(|parser| parser.parse())?)
         } else if parser.peek2::<kw::component>()? {