diff --git a/Cargo.toml b/Cargo.toml
index 93abf39708..8dfa79cbdf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,7 @@ exclude = [
     "analysis/tests",
     "examples",
     "tests",
+    "tools",
 ]
 
 [workspace.package]
diff --git a/tools/README.md b/tools/README.md
new file mode 100644
index 0000000000..0583551071
--- /dev/null
+++ b/tools/README.md
@@ -0,0 +1,20 @@
+# C2Rust CRISP tools
+
+- `merge_rust`
+- `split_rust`
+- `split_ffi_entry_points`
+
+## Building
+
+These tools rely on rust-analyzer's libraries, so they need a relatively recent version of Rust. Run `cargo build --release` in their respective directories to build them.
+
+## Running
+
+`split_rust` and `merge_rust` expect the root source file of a Rust project as their first argument, e.g. `lib.rs` or `main.rs`.
+
+- `merge_rust` modifies the specified codebase in-place.
+- `split_rust` emits JSON on standard output.
+
+`split_ffi_entry_points` expects a Rust project directory (the directory containing a `Cargo.toml` file) as its only argument.
+
+It modifies that Rust project in-place.
diff --git a/tools/merge_rust/Cargo.lock b/tools/merge_rust/Cargo.lock
new file mode 100644
index 0000000000..ca20e777f6
--- /dev/null
+++ b/tools/merge_rust/Cargo.lock
@@ -0,0 +1,260 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "anstream"
+version = "0.6.21"
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+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
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+
+[[package]]
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+ "windows-sys",
+]
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+ "strsim",
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+
+[[package]]
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+ "clap",
+ "proc-macro2",
+ "quote",
+ "rust_util",
+ "serde_json",
+ "syn",
+]
+
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+[[package]]
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+ "proc-macro2",
+ "quote",
+ "syn",
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+ "ryu",
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+ "serde_core",
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diff --git a/tools/merge_rust/Cargo.toml b/tools/merge_rust/Cargo.toml
new file mode 100644
index 0000000000..f6f241940d
--- /dev/null
+++ b/tools/merge_rust/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "merge_rust"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rust_util = { path = "../rust_util" }
+
+syn = { version = "2.0.108", features = ["full", "visit"] }
+proc-macro2 = { version = "1", features = ["span-locations"] }
+clap = { version = "4.5", features = ["derive"] }
+quote = "1"
+
+serde_json = "1"
diff --git a/tools/merge_rust/src/main.rs b/tools/merge_rust/src/main.rs
new file mode 100644
index 0000000000..266158ddcd
--- /dev/null
+++ b/tools/merge_rust/src/main.rs
@@ -0,0 +1,70 @@
+use clap::Parser;
+use rust_util::collect::FileCollector;
+use rust_util::item_span::item_spans;
+use serde_json;
+use std::collections::HashMap;
+use std::fs::{self, File};
+use std::path::PathBuf;
+
+/// Merge updated item definitions into a Rust codebase.
+#[derive(Parser)]
+struct Args {
+    /// Root Rust source file to update (`lib.rs` or `main.rs`).
+    src_root_path: PathBuf,
+    /// JSON file containing mapping from Rust item paths to desired new contents.
+    new_snippets_file: PathBuf,
+}
+
+fn main() {
+    let args = Args::parse();
+    let src_root_path = args.src_root_path;
+    let new_snippet_json_path = args.new_snippets_file;
+
+    let new_snippets_file = File::open(&new_snippet_json_path).unwrap();
+    let new_snippets: HashMap<String, String> = serde_json::from_reader(new_snippets_file).unwrap();
+
+    let mut fc = FileCollector::default();
+    fc.parse(&src_root_path, vec![], true).unwrap();
+    for &(ref file_path, ref mod_path, ref ast) in &fc.files {
+        eprintln!("visit {:?}", file_path);
+        let old_src = fs::read_to_string(file_path).unwrap();
+
+        let mut rewrites = Vec::new();
+        for (item_path, lo, hi) in item_spans(mod_path.to_owned(), ast) {
+            let old_snippet = &old_src[lo..hi];
+            let item_path_str = item_path.join("::");
+            if let Some(new_snippet) = new_snippets.get(&item_path_str) {
+                if new_snippet != old_snippet {
+                    rewrites.push((lo, hi, new_snippet));
+                }
+            }
+        }
+
+        if rewrites.len() == 0 {
+            continue;
+        }
+
+        rewrites.sort_by_key(|&(lo, _, _)| lo);
+        let mut new_src = String::with_capacity(old_src.len());
+        let mut pos = 0;
+        for &(lo, hi, new_snippet) in &rewrites {
+            assert!(
+                lo >= pos,
+                "overlapping rewrites: previous rewrite ended at {}, \
+                but current rewrite covers {} .. {}",
+                pos,
+                lo,
+                hi
+            );
+            new_src.push_str(&old_src[pos..lo]);
+            new_src.push_str(new_snippet);
+            pos = hi;
+        }
+        new_src.push_str(&old_src[pos..]);
+
+        let tmp_path = file_path.with_extension(".new");
+        fs::write(&tmp_path, &new_src).unwrap();
+        fs::rename(&tmp_path, file_path).unwrap();
+        eprintln!("applied {} rewrites to {:?}", rewrites.len(), file_path);
+    }
+}
diff --git a/tools/related_decls/Cargo.lock b/tools/related_decls/Cargo.lock
new file mode 100644
index 0000000000..bee8145082
--- /dev/null
+++ b/tools/related_decls/Cargo.lock
@@ -0,0 +1,2047 @@
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+# It is not intended for manual editing.
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+
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+checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/tools/related_decls/Cargo.toml b/tools/related_decls/Cargo.toml
new file mode 100644
index 0000000000..ecbd805879
--- /dev/null
+++ b/tools/related_decls/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "related_decls"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rust_util = { path = "../rust_util" }
+
+syn = { version = "2.0.108", features = ["full", "visit-mut", "visit"] }
+proc-macro2 = { version = "1", features = ["span-locations"] }
+quote = "1"
+
+ra_ap_hir = "=0.0.301"
+ra_ap_ide_db = "=0.0.301"
+ra_ap_load-cargo = "=0.0.301"
+ra_ap_project_model = "=0.0.301"
+ra_ap_syntax = "=0.0.301"
diff --git a/tools/related_decls/src/main.rs b/tools/related_decls/src/main.rs
new file mode 100644
index 0000000000..c19d12ee3d
--- /dev/null
+++ b/tools/related_decls/src/main.rs
@@ -0,0 +1,401 @@
+use proc_macro2::{Span, TokenStream};
+use quote::ToTokens;
+use ra_ap_hir::Semantics;
+use ra_ap_ide_db::RootDatabase;
+use ra_ap_load_cargo::{self, LoadCargoConfig, ProcMacroServerChoice};
+use ra_ap_project_model::CargoConfig;
+use ra_ap_syntax::SyntaxNode;
+use rust_util::rewrite::{FlatTokens, OutputBuffer, TokenIndex, render_output};
+use std::env;
+use std::fs;
+use std::iter;
+use std::mem;
+use std::path::Path;
+use std::str::FromStr;
+use syn;
+use syn::spanned::Spanned;
+use syn::visit_mut::{self, VisitMut};
+
+struct AddDerivedItemVisitor<F>(F);
+
+impl<F: FnMut(&mut syn::Item) -> Option<syn::Item>> AddDerivedItemVisitor<F> {
+    fn visit_items(&mut self, items: &mut Vec<syn::Item>) {
+        let new_items = Vec::with_capacity(items.len());
+        let old_items = mem::replace(items, new_items);
+        for mut item in old_items {
+            let derived_item = (self.0)(&mut item);
+            items.push(item);
+            if let Some(derived_item) = derived_item {
+                items.push(derived_item);
+            }
+        }
+    }
+}
+
+impl<F: FnMut(&mut syn::Item) -> Option<syn::Item>> VisitMut for AddDerivedItemVisitor<F> {
+    fn visit_item_mod_mut(&mut self, im: &mut syn::ItemMod) {
+        let items = match im.content {
+            Some((_, ref mut x)) => x,
+            None => return,
+        };
+        self.visit_items(items);
+        visit_mut::visit_item_mod_mut(self, im);
+    }
+
+    fn visit_file_mut(&mut self, f: &mut syn::File) {
+        self.visit_items(&mut f.items);
+        visit_mut::visit_file_mut(self, f);
+    }
+}
+
+fn add_ffi_wrapper(
+    _db: &RootDatabase,
+    _sema: &Semantics<RootDatabase>,
+    _root: SyntaxNode,
+    item: &mut syn::Item,
+) -> Option<syn::Item> {
+    let fn_item = match *item {
+        syn::Item::Fn(ref mut x) => x,
+        _ => return None,
+    };
+    let fn_name = fn_item.sig.ident.to_string();
+
+    // Example of gathering semantic information from rust-analyzer:
+    /*
+    let range = span_to_text_range(fn_item.span());
+    let cover = root.covering_element(range);
+    // If this assert fails, we might need to look for a `FN` ancestor of `cover` instead.
+    debug_assert_eq!(cover.kind(), SyntaxKind::FN);
+    let cover = cover.into_node().unwrap();
+    let f_ast = ast::Fn::cast(cover).unwrap();
+    eprintln!("f_ast = {f_ast:?}");
+
+    let f = sema.to_fn_def(&f_ast).unwrap();
+    eprintln!("f = {f:?}");
+
+    let attrs = f.attrs(db);
+    // etc...
+    */
+
+    // Walk over the attributes of `fn_item`, sorting them into attrs that should remain on the
+    // inner function and ones that should be moved or copied onto the newly-generated wrapper.
+    let mut inner_attrs = Vec::with_capacity(fn_item.attrs.len());
+    let mut wrapper_attrs = Vec::new();
+    let mut need_wrapper = false;
+
+    for mut attr in mem::take(&mut fn_item.attrs) {
+        let mut pm = ParsedMeta::from(attr.meta);
+
+        let mut move_to_wrapper = false;
+        pm.with_innermost_mut(&mut |pm| match pm {
+            ParsedMeta::NoMangle(..) => {
+                move_to_wrapper = true;
+                *pm = ParsedMeta::ExportName(ParsedMetaExportName {
+                    ident: syn::Ident::new("export_name", Span::call_site()),
+                    eq: syn::Token![=](Span::call_site()),
+                    name: syn::LitStr::new(&fn_name, Span::call_site()),
+                });
+            }
+            ParsedMeta::ExportName(..) => {
+                move_to_wrapper = true;
+            }
+            _ => {}
+        });
+
+        attr.meta = pm.into();
+
+        if move_to_wrapper {
+            wrapper_attrs.push(attr);
+            need_wrapper = true;
+        } else {
+            inner_attrs.push(attr);
+        }
+    }
+
+    fn_item.attrs = inner_attrs;
+
+    if !need_wrapper {
+        return None;
+    }
+
+    let wrapper_name = format!("{fn_name}_ffi");
+    let mut fn_wrapper = syn::ItemFn {
+        attrs: wrapper_attrs,
+        vis: fn_item.vis.clone(),
+        sig: fn_item.sig.clone(),
+        block: Box::new(syn::Block {
+            brace_token: syn::token::Brace::default(),
+            stmts: Vec::new(),
+        }),
+    };
+    fn_wrapper.sig.ident = syn::Ident::new(&wrapper_name, Span::call_site());
+
+    let mut arg_exprs = Vec::new();
+    for (i, arg) in fn_wrapper.sig.inputs.iter_mut().enumerate() {
+        let ident = match *arg {
+            syn::FnArg::Receiver(_) => syn::Ident::new("self", Span::call_site()),
+            syn::FnArg::Typed(ref mut pt) => match *pt.pat {
+                syn::Pat::Ident(ref pi) => pi.ident.clone(),
+                _ => {
+                    let ident = syn::Ident::new(&format!("arg{i}"), Span::call_site());
+                    *pt.pat = syn::Pat::Ident(syn::PatIdent {
+                        attrs: Vec::new(),
+                        by_ref: None,
+                        mutability: None,
+                        ident: ident.clone(),
+                        subpat: None,
+                    });
+                    ident
+                }
+            },
+        };
+        let expr = syn::Expr::Path(syn::ExprPath {
+            attrs: Vec::new(),
+            qself: None,
+            path: syn::Path::from(ident),
+        });
+        arg_exprs.push(expr);
+    }
+
+    let wrapper_expr = syn::Expr::Call(syn::ExprCall {
+        attrs: Vec::new(),
+        func: Box::new(syn::Expr::Path(syn::ExprPath {
+            attrs: Vec::new(),
+            qself: None,
+            path: syn::Path::from(syn::Ident::new(&fn_name, Span::call_site())),
+        })),
+        paren_token: syn::token::Paren::default(),
+        args: arg_exprs.into_iter().collect(),
+    });
+    let wrapper_stmt = syn::Stmt::Expr(wrapper_expr, None);
+    fn_wrapper.block.stmts.push(wrapper_stmt);
+
+    Some(fn_wrapper.into())
+}
+
+/*
+fn span_to_text_range(span: Span) -> TextRange {
+    let span_range = span.byte_range();
+    let lo = TextSize::try_from(span_range.start).unwrap();
+    let hi = TextSize::try_from(span_range.end).unwrap();
+    TextRange::new(lo, hi)
+}
+*/
+
+// Helpers for dealing with nested meta items in attrs, like `#[unsafe(no_mangle)]`
+
+#[derive(Clone)]
+enum ParsedMeta {
+    Meta(syn::Meta),
+    Unsafe(Box<ParsedMetaUnsafe>),
+    NoMangle(ParsedMetaNoMangle),
+    ExportName(ParsedMetaExportName),
+}
+
+#[derive(Clone)]
+struct ParsedMetaUnsafe {
+    ident: syn::Ident,
+    paren: syn::token::Paren,
+    inner: ParsedMeta,
+}
+
+#[derive(Clone)]
+struct ParsedMetaNoMangle {
+    ident: syn::Ident,
+}
+
+#[derive(Clone)]
+struct ParsedMetaExportName {
+    ident: syn::Ident,
+    eq: syn::Token![=],
+    name: syn::LitStr,
+}
+
+impl ParsedMeta {
+    pub fn parse(meta: &syn::Meta) -> syn::Result<ParsedMeta> {
+        let ident = meta.path().require_ident()?;
+        let ident_str = ident.to_string();
+        match ident_str.as_str() {
+            "unsafe" => {
+                let ml = meta.require_list()?;
+                let ident = ml.path.require_ident()?.clone();
+                let paren = match ml.delimiter {
+                    syn::MacroDelimiter::Paren(p) => p,
+                    _ => {
+                        return Err(syn::Error::new(
+                            ml.delimiter.span().open(),
+                            "expected parens",
+                        ));
+                    }
+                };
+                let meta: syn::Meta = syn::parse2(ml.tokens.clone())?;
+                let inner = ParsedMeta::from(meta);
+                Ok(ParsedMeta::Unsafe(Box::new(ParsedMetaUnsafe {
+                    ident,
+                    paren,
+                    inner,
+                })))
+            }
+            "no_mangle" => {
+                let _ = meta.require_path_only()?;
+                let ident = ident.clone();
+                Ok(ParsedMeta::NoMangle(ParsedMetaNoMangle { ident }))
+            }
+            "export_name" => {
+                let mnv = meta.require_name_value()?;
+                let ident = mnv.path.require_ident()?.clone();
+                let eq = mnv.eq_token;
+                let expr_lit = match mnv.value {
+                    syn::Expr::Lit(ref el) => el,
+                    _ => return Err(syn::Error::new(mnv.value.span(), "expected Lit")),
+                };
+                let syn::ExprLit { ref attrs, ref lit } = *expr_lit;
+                if attrs.len() > 0 {
+                    return Err(syn::Error::new(expr_lit.span(), "name must not have attrs"));
+                }
+                let name = match *lit {
+                    syn::Lit::Str(ref ls) => ls.clone(),
+                    _ => return Err(syn::Error::new(lit.span(), "expected Str")),
+                };
+                Ok(ParsedMeta::ExportName(ParsedMetaExportName {
+                    ident,
+                    eq,
+                    name,
+                }))
+            }
+            _ => Ok(ParsedMeta::Meta(meta.clone())),
+        }
+    }
+
+    pub fn with_innermost_mut(&mut self, f: &mut impl FnMut(&mut ParsedMeta)) {
+        match *self {
+            ParsedMeta::Meta(..) | ParsedMeta::NoMangle(..) | ParsedMeta::ExportName(..) => f(self),
+            ParsedMeta::Unsafe(ref mut pmu) => pmu.inner.with_innermost_mut(f),
+        }
+    }
+}
+
+impl From<syn::Meta> for ParsedMeta {
+    fn from(meta: syn::Meta) -> ParsedMeta {
+        match Self::parse(&meta) {
+            Ok(x) => x,
+            Err(e) => {
+                eprintln!("warning: failed to parse `{}`: {e}", meta.to_token_stream());
+                ParsedMeta::Meta(meta)
+            }
+        }
+    }
+}
+
+impl From<ParsedMeta> for syn::Meta {
+    fn from(pm: ParsedMeta) -> syn::Meta {
+        syn::parse2(pm.into_token_stream()).unwrap()
+    }
+}
+
+impl ToTokens for ParsedMeta {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        match *self {
+            ParsedMeta::Meta(ref x) => x.to_tokens(tokens),
+            ParsedMeta::Unsafe(ref x) => x.to_tokens(tokens),
+            ParsedMeta::NoMangle(ref x) => x.to_tokens(tokens),
+            ParsedMeta::ExportName(ref x) => x.to_tokens(tokens),
+        }
+    }
+}
+
+impl ToTokens for ParsedMetaUnsafe {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        self.ident.to_tokens(tokens);
+        self.paren.surround(tokens, |tokens| {
+            self.inner.to_tokens(tokens);
+        });
+    }
+}
+
+impl ToTokens for ParsedMetaNoMangle {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        self.ident.to_tokens(tokens);
+    }
+}
+
+impl ToTokens for ParsedMetaExportName {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        self.ident.to_tokens(tokens);
+        self.eq.to_tokens(tokens);
+        self.name.to_tokens(tokens);
+    }
+}
+
+fn main() {
+    let cargo_dir_path = env::args().nth(1).unwrap();
+    let cargo_dir_path = Path::new(&cargo_dir_path);
+
+    let cargo_config = CargoConfig::default();
+
+    let load_cargo_config: LoadCargoConfig = LoadCargoConfig {
+        load_out_dirs_from_check: true,
+        with_proc_macro_server: ProcMacroServerChoice::Sysroot,
+        prefill_caches: false,
+    };
+
+    let (db, vfs, _proc_macro_client) = ra_ap_load_cargo::load_workspace_at(
+        cargo_dir_path,
+        &cargo_config,
+        &load_cargo_config,
+        &|_msg| {},
+    )
+    .unwrap();
+
+    // Assume the first file in `vfs` is the crate root.
+    let (first_file_id, _) = vfs.iter().next().unwrap();
+
+    let sema = Semantics::new(&db);
+
+    eprintln!("processing crate...");
+    let krate = sema.first_crate(first_file_id).unwrap();
+
+    let mut files = Vec::new();
+    for m in krate.modules(&db) {
+        let src = m.definition_source(&db);
+        let node = src.value.node();
+        if let Some(editioned_file_id) = m.as_source_file_id(&db) {
+            sema.parse(editioned_file_id);
+            let file_id = editioned_file_id.file_id(&db);
+            let vfs_path = vfs.file_path(file_id);
+            if let Some(path) = vfs_path.as_path() {
+                files.push((path.to_path_buf(), node));
+            }
+        }
+    }
+
+    for (path, root) in files {
+        // Only rewrite files that are inside the provided cargo dir.  If our strategy for finding
+        // the main crate is wrong, this will keep us from overwriting files unexpectedly.
+        let mut ancestors = iter::successors(Some(path.as_path()), |p| p.parent());
+        if !ancestors.any(|a| a == cargo_dir_path) {
+            eprintln!("skip {path:?}: outside cargo dir {cargo_dir_path:?}");
+            continue;
+        }
+
+        let code = fs::read_to_string(&path).unwrap();
+
+        let ts = TokenStream::from_str(&code).unwrap();
+        let orig_tokens = FlatTokens::new(ts.clone()).collect::<Vec<_>>();
+        let ti = TokenIndex::new(&orig_tokens);
+
+        let mut ast: syn::File = syn::parse2(ts.clone()).unwrap();
+        let mut v = AddDerivedItemVisitor(|i: &mut syn::Item| -> Option<syn::Item> {
+            add_ffi_wrapper(&db, &sema, root.clone(), i)
+        });
+        v.visit_file_mut(&mut ast);
+
+        let new_ts = ast.into_token_stream();
+
+        let mut buf = OutputBuffer::new();
+        render_output(&code, &orig_tokens, &ti, new_ts, &mut buf);
+        let s = buf.finish();
+        fs::write(&path, &s).unwrap();
+        eprintln!("wrote {:?}", path);
+    }
+}
diff --git a/tools/rust-toolchain.toml b/tools/rust-toolchain.toml
new file mode 100644
index 0000000000..292fe499e3
--- /dev/null
+++ b/tools/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "stable"
diff --git a/tools/rust_util/Cargo.lock b/tools/rust_util/Cargo.lock
new file mode 100644
index 0000000000..ea2628801a
--- /dev/null
+++ b/tools/rust_util/Cargo.lock
@@ -0,0 +1,47 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.103"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ee95bc4ef87b8d5ba32e8b7714ccc834865276eab0aed5c9958d00ec45f49e8"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a338cc41d27e6cc6dce6cefc13a0729dfbb81c262b1f519331575dd80ef3067f"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rust_util"
+version = "0.1.0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.110"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a99801b5bd34ede4cf3fc688c5919368fea4e4814a4664359503e6015b280aea"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9312f7c4f6ff9069b165498234ce8be658059c6728633667c526e27dc2cf1df5"
diff --git a/tools/rust_util/Cargo.toml b/tools/rust_util/Cargo.toml
new file mode 100644
index 0000000000..9622ced91f
--- /dev/null
+++ b/tools/rust_util/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "rust_util"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+syn = { version = "2.0.108", features = ["full", "visit-mut", "visit"] }
+proc-macro2 = { version = "1", features = ["span-locations"] }
+quote = "1"
diff --git a/tools/rust_util/src/collect.rs b/tools/rust_util/src/collect.rs
new file mode 100644
index 0000000000..6a9e6fe179
--- /dev/null
+++ b/tools/rust_util/src/collect.rs
@@ -0,0 +1,117 @@
+use crate::error::Error;
+use std::collections::HashSet;
+use std::fs;
+use std::iter;
+use std::path::{Path, PathBuf};
+use syn;
+use syn::ext::IdentExt;
+
+#[derive(Clone, Default)]
+pub struct FileCollector {
+    /// File path, module path, and AST for each file visited so far.
+    pub files: Vec<(PathBuf, Vec<String>, syn::File)>,
+    seen: HashSet<PathBuf>,
+}
+
+impl FileCollector {
+    pub fn parse(
+        &mut self,
+        file_path: impl AsRef<Path>,
+        mod_path: Vec<String>,
+        is_root: bool,
+    ) -> Result<(), Error> {
+        let file_path = file_path.as_ref();
+        if self.seen.contains(file_path) {
+            return Ok(());
+        }
+        let src = fs::read_to_string(file_path)
+            .map_err(|e| Error::from(e).at(format_args!("reading {file_path:?}")))?;
+        let ast: syn::File = syn::parse_file(&src)
+            .map_err(|e| Error::from(e).at(format_args!("parsing {file_path:?}")))?;
+        // Set `seen` immediately, but don't add to `files` (and give up ownership) until we're
+        // done walking `ast`.
+        self.seen.insert(file_path.to_owned());
+        let is_mod_rs = is_root || file_path.file_name().is_some_and(|n| n == "mod.rs");
+        let base_path_storage;
+        let base_path = if is_mod_rs {
+            file_path
+                .parent()
+                .ok_or_else(|| format!("mod.rs path {file_path:?} has no parent"))?
+        } else {
+            base_path_storage = file_path.with_extension("");
+            &base_path_storage
+        };
+        self.walk_items(&ast.items, base_path, mod_path.clone(), &[])?;
+        self.files.push((file_path.to_owned(), mod_path, ast));
+        Ok(())
+    }
+
+    fn walk_items(
+        &mut self,
+        items: &[syn::Item],
+        base_path: &Path,
+        mut mod_path: Vec<String>,
+        parent_module: &[&str],
+    ) -> Result<(), Error> {
+        for item in items {
+            let im = match *item {
+                syn::Item::Mod(ref im) => im,
+                _ => continue,
+            };
+            mod_path.push(im.ident.unraw().to_string());
+            if let Some((_, ref inline_items)) = im.content {
+                let name =
+                    path_attr_value(&im.attrs)?.unwrap_or_else(|| im.ident.unraw().to_string());
+                let module = parent_module
+                    .iter()
+                    .copied()
+                    .chain(iter::once(&name as &_))
+                    .collect::<Vec<_>>();
+                self.walk_items(inline_items, base_path, mod_path.clone(), &module)?;
+            } else {
+                let mut path = base_path.to_owned();
+                for &m in parent_module {
+                    path.push(m);
+                }
+                if let Some(attr_path) = path_attr_value(&im.attrs)? {
+                    path.push(attr_path);
+                    self.parse(path, mod_path.clone(), false)?;
+                } else {
+                    let name = im.ident.unraw().to_string();
+                    // Try `foo/mod.rs` first; if it doesn't exist, try `foo.rs` instead.
+                    path.push(name);
+                    path.push("mod.rs");
+                    if !fs::exists(&path)? {
+                        path.pop();
+                        path.set_extension("rs");
+                    }
+                    self.parse(path, mod_path.clone(), false)?;
+                }
+            }
+            mod_path.pop();
+        }
+        Ok(())
+    }
+}
+
+fn path_attr_value(attrs: &[syn::Attribute]) -> Result<Option<String>, Error> {
+    for attr in attrs {
+        if !attr.meta.path().is_ident("path") {
+            continue;
+        }
+        let mnv = match attr.meta {
+            syn::Meta::NameValue(ref x) => x,
+            _ => return Err("expected `path` attribute to have a value".into()),
+        };
+        let el = match mnv.value {
+            syn::Expr::Lit(ref x) => x,
+            _ => return Err("expected `path` attribute value to be a literal".into()),
+        };
+        let ls = match el.lit {
+            syn::Lit::Str(ref x) => x,
+            _ => return Err("expected `path` attribute value to be a string literal".into()),
+        };
+        return Ok(Some(ls.value()));
+    }
+    Ok(None)
+}
diff --git a/tools/rust_util/src/error.rs b/tools/rust_util/src/error.rs
new file mode 100644
index 0000000000..28e93187d5
--- /dev/null
+++ b/tools/rust_util/src/error.rs
@@ -0,0 +1,63 @@
+use std::fmt::{self, Display};
+use std::io;
+use syn;
+
+#[derive(Debug)]
+pub enum Error {
+    Io(io::Error),
+    Syn(syn::Error),
+    Str(String),
+    At(String, Box<Error>),
+}
+
+impl From<io::Error> for Error {
+    fn from(x: io::Error) -> Error {
+        Error::Io(x)
+    }
+}
+
+impl From<syn::Error> for Error {
+    fn from(x: syn::Error) -> Error {
+        Error::Syn(x)
+    }
+}
+
+impl From<String> for Error {
+    fn from(x: String) -> Error {
+        Error::Str(x)
+    }
+}
+
+impl From<&str> for Error {
+    fn from(x: &str) -> Error {
+        Error::Str(x.to_owned())
+    }
+}
+
+impl Error {
+    pub fn at(self, desc: impl Display) -> Error {
+        Error::At(desc.to_string(), Box::new(self))
+    }
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Error::Io(x) => Display::fmt(x, f),
+            Error::Syn(x) => Display::fmt(x, f),
+            Error::Str(x) => Display::fmt(x, f),
+            Error::At(desc, inner) => write!(f, "{desc}: {inner}"),
+        }
+    }
+}
+
+impl std::error::Error for Error {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Error::Io(x) => Some(x),
+            Error::Syn(x) => Some(x),
+            Error::Str(_) => None,
+            Error::At(_, x) => Some(x),
+        }
+    }
+}
diff --git a/tools/rust_util/src/item_span.rs b/tools/rust_util/src/item_span.rs
new file mode 100644
index 0000000000..c840347593
--- /dev/null
+++ b/tools/rust_util/src/item_span.rs
@@ -0,0 +1,60 @@
+use proc_macro2::Span;
+use syn;
+use syn::spanned::Spanned;
+use syn::visit::{self, Visit};
+
+struct ItemSpanVisitor {
+    cur_path: Vec<String>,
+    item_spans: Vec<(Vec<String>, usize, usize)>,
+}
+
+impl ItemSpanVisitor {
+    pub fn new(mod_path: Vec<String>) -> ItemSpanVisitor {
+        ItemSpanVisitor {
+            cur_path: mod_path,
+            item_spans: Vec::new(),
+        }
+    }
+
+    fn _emit(&mut self, name: String, sp: Span) {
+        self.enter(name, sp, |_| {});
+    }
+
+    fn enter<R>(&mut self, name: String, sp: Span, f: impl FnOnce(&mut Self) -> R) -> R {
+        self.cur_path.push(name);
+
+        let range = sp.byte_range();
+        self.item_spans
+            .push((self.cur_path.clone(), range.start, range.end));
+        let r = f(self);
+
+        self.cur_path.pop();
+        r
+    }
+}
+
+impl Visit<'_> for ItemSpanVisitor {
+    fn visit_item(&mut self, item: &syn::Item) {
+        match *item {
+            syn::Item::Fn(ref ifn) => {
+                let name = ifn.sig.ident.to_string();
+                self.enter(name, ifn.span(), |v| v.visit_item_fn(ifn));
+            }
+            syn::Item::Mod(ref im) => {
+                let name = im.ident.to_string();
+                self.enter(name, im.span(), |v| v.visit_item_mod(im));
+            }
+            // TODO: handle other items that can contain nested items.  Note that any expr or type
+            // can contain items, e.g. `type T = [u8; { fn f(){} 10 }];`
+            _ => {
+                visit::visit_item(self, item);
+            }
+        }
+    }
+}
+
+pub fn item_spans(mod_path: Vec<String>, ast: &syn::File) -> Vec<(Vec<String>, usize, usize)> {
+    let mut v = ItemSpanVisitor::new(mod_path);
+    v.visit_file(ast);
+    v.item_spans
+}
diff --git a/tools/rust_util/src/lib.rs b/tools/rust_util/src/lib.rs
new file mode 100644
index 0000000000..06ffc31b9e
--- /dev/null
+++ b/tools/rust_util/src/lib.rs
@@ -0,0 +1,4 @@
+pub mod collect;
+pub mod error;
+pub mod item_span;
+pub mod rewrite;
diff --git a/tools/rust_util/src/rewrite.rs b/tools/rust_util/src/rewrite.rs
new file mode 100644
index 0000000000..42a9c76bb8
--- /dev/null
+++ b/tools/rust_util/src/rewrite.rs
@@ -0,0 +1,239 @@
+use proc_macro2::{Delimiter, Spacing, Span, TokenStream, TokenTree};
+use std::collections::BTreeSet;
+
+pub struct FlatTokens {
+    stack: Vec<(proc_macro2::token_stream::IntoIter, Delimiter, Span)>,
+}
+
+impl FlatTokens {
+    pub fn new(ts: TokenStream) -> FlatTokens {
+        FlatTokens {
+            stack: vec![(ts.into_iter(), Delimiter::None, Span::call_site())],
+        }
+    }
+}
+
+impl Iterator for FlatTokens {
+    type Item = Token;
+    fn next(&mut self) -> Option<Token> {
+        while let Some(&mut (ref mut it, delim, span_close)) = self.stack.last_mut() {
+            match it.next() {
+                Some(TokenTree::Group(g)) => {
+                    // Return the open delimiter and continue with the contents of the group.
+                    self.stack
+                        .push((g.stream().into_iter(), g.delimiter(), g.span_close()));
+                    let open_ch = match g.delimiter() {
+                        Delimiter::Parenthesis => '(',
+                        Delimiter::Bracket => '[',
+                        Delimiter::Brace => '{',
+                        // Skip over `Delimiter::None`, and `continue` to try the next available
+                        // token.
+                        Delimiter::None => continue,
+                    };
+                    let range = g.span_open().byte_range();
+                    return Some(Token {
+                        text: open_ch.to_string().into(),
+                        spacing: Spacing::Alone,
+                        span: (range.start, range.end),
+                    });
+                }
+                Some(tt @ TokenTree::Ident(_))
+                | Some(tt @ TokenTree::Punct(_))
+                | Some(tt @ TokenTree::Literal(_)) => return Some(Token::from_token_tree(tt)),
+                None => {
+                    // Pop the now-empty group and return the close delimiter.
+                    self.stack.pop();
+                    let close_ch = match delim {
+                        Delimiter::Parenthesis => ')',
+                        Delimiter::Bracket => ']',
+                        Delimiter::Brace => '}',
+                        // Skip over `Delimiter::None`, and `continue` to try the next available
+                        // token.
+                        Delimiter::None => continue,
+                    };
+                    let range = span_close.byte_range();
+                    return Some(Token {
+                        text: close_ch.to_string().into(),
+                        spacing: Spacing::Alone,
+                        span: (range.start, range.end),
+                    });
+                }
+            }
+        }
+        None
+    }
+}
+
+#[derive(Clone, PartialEq, Eq, Debug)]
+pub struct Token {
+    pub text: Box<str>,
+    /// Spacing, for punctuation tokens.  This is `Spacing::Alone` for all non-`Punct` tokens.
+    pub spacing: Spacing,
+    pub span: (usize, usize),
+}
+
+impl Token {
+    pub fn from_token_tree(tt: TokenTree) -> Token {
+        let text = tt.to_string().into_boxed_str();
+        let spacing = match tt {
+            TokenTree::Punct(ref p) => p.spacing(),
+            _ => Spacing::Alone,
+        };
+        let range = tt.span().byte_range();
+        let start = range.start;
+        let end = range.end;
+        Token {
+            text,
+            spacing,
+            span: (start, end),
+        }
+    }
+}
+
+pub struct TokenIndex<'a> {
+    tokens: &'a [Token],
+    /// Multi-map mapping `(start, end)` to indexes in `tokens` that have that span.
+    index: BTreeSet<((usize, usize), usize)>,
+}
+
+impl<'a> TokenIndex<'a> {
+    pub fn new(tokens: &'a [Token]) -> TokenIndex<'a> {
+        let mut index = BTreeSet::new();
+        for (i, t) in tokens.iter().enumerate() {
+            index.insert((t.span, i));
+        }
+        TokenIndex { tokens, index }
+    }
+
+    pub fn find<'b>(&'b self, t: &Token) -> Option<usize> {
+        let (start, end) = t.span;
+        let lo = ((start, end), 0);
+        let hi = ((start, end), usize::MAX);
+        let mut found = None;
+        for &(_, i) in self.index.range(lo..=hi) {
+            if self.tokens[i] == *t {
+                if found.is_none() {
+                    found = Some(i);
+                } else {
+                    // Found multiple identical tokens.  This is ambiguous.
+                    return None;
+                }
+            }
+        }
+        found
+    }
+}
+
+pub struct OutputBuffer {
+    s: String,
+    /// Whether the most recently emitted chunk had `Spacing::Joint`.
+    prev_was_joint: bool,
+    /// Index in `s` of the start of the most recent line.
+    prev_bol: usize,
+}
+
+impl OutputBuffer {
+    pub fn new() -> OutputBuffer {
+        OutputBuffer {
+            s: String::new(),
+            prev_was_joint: true,
+            prev_bol: 0,
+        }
+    }
+
+    /// Emit a token or a group of tokens.
+    ///
+    /// This assumes that the start of `chunk` is the start of a token (not whitespace or a non-doc
+    /// comment) and that the end of `chunk` is the end of a token.
+    pub fn emit(&mut self, chunk: &str, spacing: Spacing) {
+        let cur_line = &self.s[self.prev_bol..];
+        if self.prev_was_joint {
+            // No whitespace is allowed between a `Joint` token and the subsequent token.
+        } else {
+            if cur_line.contains("//") {
+                // Note this can throw false positives, such as if `//` appears inside a string
+                // literal.  But it's legal to replace any `' '` with `'\n'`; `rustfmt` will fix it
+                // if needed.
+                self.s.push('\n');
+                self.prev_bol = self.s.len();
+            } else {
+                self.s.push(' ');
+            }
+        }
+
+        // If `chunk` contains a newline, update the beginning-of-line position.
+        if let Some(i) = chunk.bytes().rposition(|b| b == b'\n') {
+            self.prev_bol = self.s.len() + i + 1;
+        }
+
+        self.s.push_str(chunk);
+        self.prev_was_joint = matches!(spacing, Spacing::Joint);
+    }
+
+    pub fn finish(self) -> String {
+        self.s
+    }
+}
+
+pub fn render_output(
+    orig: &str,
+    orig_tokens: &[Token],
+    ti: &TokenIndex,
+    ts: TokenStream,
+    buf: &mut OutputBuffer,
+) {
+    if let Some(t) = orig_tokens.get(0) {
+        let (start_pos, _) = t.span;
+        buf.emit(&orig[0..start_pos], Spacing::Joint);
+    }
+
+    struct Run {
+        /// Byte offset of the start of the first token in the run.
+        start_pos: usize,
+        /// Index in `orig_tokens` of the last token in the run.
+        end_idx: usize,
+    }
+    let mut current_run: Option<Run> = None;
+    for t in FlatTokens::new(ts) {
+        // Try to continue the current run.
+        if let Some(ref mut run) = current_run {
+            if orig_tokens.get(run.end_idx + 1) == Some(&t) {
+                run.end_idx += 1;
+                continue;
+            } else {
+                // End the current run.
+                let end_token = &orig_tokens[run.end_idx];
+                let start_pos = run.start_pos;
+                let (_, end_pos) = end_token.span;
+                buf.emit(&orig[start_pos..end_pos], end_token.spacing);
+                current_run = None;
+            }
+        }
+
+        // Try to start a new run.
+        debug_assert!(current_run.is_none());
+        if let Some(idx) = ti.find(&t) {
+            let (start_pos, _) = t.span;
+            current_run = Some(Run {
+                start_pos,
+                end_idx: idx,
+            });
+            continue;
+        }
+
+        // This token is not part of a run.  Emit it directly.
+        buf.emit(&t.text, t.spacing);
+    }
+
+    if let Some(run) = current_run {
+        let end_token = &orig_tokens[run.end_idx];
+        let start_pos = run.start_pos;
+        let (_, end_pos) = end_token.span;
+        buf.emit(&orig[start_pos..end_pos], end_token.spacing);
+    }
+
+    if let Some(t) = orig_tokens.last() {
+        let (_, end_pos) = t.span;
+        buf.emit(&orig[end_pos..orig.len()], Spacing::Joint);
+    }
+}
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new file mode 100644
index 0000000000..d2ccfde983
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@@ -0,0 +1,2174 @@
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+name = "yoke-derive"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b659052874eb698efe5b9e8cf382204678a0086ebf46982b79d6ca3182927e5d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zerofrom"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50cc42e0333e05660c3587f3bf9d0478688e15d870fab3346451ce7f8c9fbea5"
+dependencies = [
+ "zerofrom-derive",
+]
+
+[[package]]
+name = "zerofrom-derive"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zerotrie"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a59c17a5562d507e4b54960e8569ebee33bee890c70aa3fe7b97e85a9fd7851"
+dependencies = [
+ "displaydoc",
+ "yoke",
+ "zerofrom",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.11.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c28719294829477f525be0186d13efa9a3c602f7ec202ca9e353d310fb9a002"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/tools/split_ffi_entry_points/Cargo.toml b/tools/split_ffi_entry_points/Cargo.toml
new file mode 100644
index 0000000000..3f7254b581
--- /dev/null
+++ b/tools/split_ffi_entry_points/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "split_ffi_entry_points"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rust_util = { path = "../rust_util" }
+
+syn = { version = "2.0.108", features = ["full", "visit-mut", "visit"] }
+proc-macro2 = { version = "1", features = ["span-locations"] }
+quote = "1"
+clap = { version = "4.5", features = ["derive"] }
+
+ra_ap_hir = "=0.0.301"
+ra_ap_ide_db = "=0.0.301"
+ra_ap_load-cargo = "=0.0.301"
+ra_ap_project_model = "=0.0.301"
+ra_ap_syntax = "=0.0.301"
diff --git a/tools/split_ffi_entry_points/src/main.rs b/tools/split_ffi_entry_points/src/main.rs
new file mode 100644
index 0000000000..33fed3afa6
--- /dev/null
+++ b/tools/split_ffi_entry_points/src/main.rs
@@ -0,0 +1,408 @@
+use clap::Parser;
+use proc_macro2::{Span, TokenStream};
+use quote::ToTokens;
+use ra_ap_hir::Semantics;
+use ra_ap_ide_db::RootDatabase;
+use ra_ap_load_cargo::{self, LoadCargoConfig, ProcMacroServerChoice};
+use ra_ap_project_model::CargoConfig;
+use ra_ap_syntax::SyntaxNode;
+use rust_util::rewrite::{FlatTokens, OutputBuffer, TokenIndex, render_output};
+use std::fs;
+use std::iter;
+use std::mem;
+use std::path::{Path, PathBuf};
+use std::str::FromStr;
+use syn;
+use syn::spanned::Spanned;
+use syn::visit_mut::{self, VisitMut};
+
+struct AddDerivedItemVisitor<F>(F);
+
+impl<F: FnMut(&mut syn::Item) -> Option<syn::Item>> AddDerivedItemVisitor<F> {
+    fn visit_items(&mut self, items: &mut Vec<syn::Item>) {
+        let new_items = Vec::with_capacity(items.len());
+        let old_items = mem::replace(items, new_items);
+        for mut item in old_items {
+            let derived_item = (self.0)(&mut item);
+            items.push(item);
+            if let Some(derived_item) = derived_item {
+                items.push(derived_item);
+            }
+        }
+    }
+}
+
+impl<F: FnMut(&mut syn::Item) -> Option<syn::Item>> VisitMut for AddDerivedItemVisitor<F> {
+    fn visit_item_mod_mut(&mut self, im: &mut syn::ItemMod) {
+        let items = match im.content {
+            Some((_, ref mut x)) => x,
+            None => return,
+        };
+        self.visit_items(items);
+        visit_mut::visit_item_mod_mut(self, im);
+    }
+
+    fn visit_file_mut(&mut self, f: &mut syn::File) {
+        self.visit_items(&mut f.items);
+        visit_mut::visit_file_mut(self, f);
+    }
+}
+
+fn add_ffi_wrapper(
+    _db: &RootDatabase,
+    _sema: &Semantics<RootDatabase>,
+    _root: SyntaxNode,
+    item: &mut syn::Item,
+) -> Option<syn::Item> {
+    let fn_item = match *item {
+        syn::Item::Fn(ref mut x) => x,
+        _ => return None,
+    };
+    let fn_name = fn_item.sig.ident.to_string();
+
+    // Example of gathering semantic information from rust-analyzer:
+    /*
+    let range = span_to_text_range(fn_item.span());
+    let cover = root.covering_element(range);
+    // If this assert fails, we might need to look for a `FN` ancestor of `cover` instead.
+    debug_assert_eq!(cover.kind(), SyntaxKind::FN);
+    let cover = cover.into_node().unwrap();
+    let f_ast = ast::Fn::cast(cover).unwrap();
+    eprintln!("f_ast = {f_ast:?}");
+
+    let f = sema.to_fn_def(&f_ast).unwrap();
+    eprintln!("f = {f:?}");
+
+    let attrs = f.attrs(db);
+    // etc...
+    */
+
+    // Walk over the attributes of `fn_item`, sorting them into attrs that should remain on the
+    // inner function and ones that should be moved or copied onto the newly-generated wrapper.
+    let mut inner_attrs = Vec::with_capacity(fn_item.attrs.len());
+    let mut wrapper_attrs = Vec::new();
+    let mut need_wrapper = false;
+
+    for mut attr in mem::take(&mut fn_item.attrs) {
+        let mut pm = ParsedMeta::from(attr.meta);
+
+        let mut move_to_wrapper = false;
+        pm.with_innermost_mut(&mut |pm| match pm {
+            ParsedMeta::NoMangle(..) => {
+                move_to_wrapper = true;
+                *pm = ParsedMeta::ExportName(ParsedMetaExportName {
+                    ident: syn::Ident::new("export_name", Span::call_site()),
+                    eq: syn::Token![=](Span::call_site()),
+                    name: syn::LitStr::new(&fn_name, Span::call_site()),
+                });
+            }
+            ParsedMeta::ExportName(..) => {
+                move_to_wrapper = true;
+            }
+            _ => {}
+        });
+
+        attr.meta = pm.into();
+
+        if move_to_wrapper {
+            wrapper_attrs.push(attr);
+            need_wrapper = true;
+        } else {
+            inner_attrs.push(attr);
+        }
+    }
+
+    fn_item.attrs = inner_attrs;
+
+    if !need_wrapper {
+        return None;
+    }
+
+    let wrapper_name = format!("{fn_name}_ffi");
+    let mut fn_wrapper = syn::ItemFn {
+        attrs: wrapper_attrs,
+        vis: fn_item.vis.clone(),
+        sig: fn_item.sig.clone(),
+        block: Box::new(syn::Block {
+            brace_token: syn::token::Brace::default(),
+            stmts: Vec::new(),
+        }),
+    };
+    fn_wrapper.sig.ident = syn::Ident::new(&wrapper_name, Span::call_site());
+
+    let mut arg_exprs = Vec::new();
+    for (i, arg) in fn_wrapper.sig.inputs.iter_mut().enumerate() {
+        let ident = match *arg {
+            syn::FnArg::Receiver(_) => syn::Ident::new("self", Span::call_site()),
+            syn::FnArg::Typed(ref mut pt) => match *pt.pat {
+                syn::Pat::Ident(ref pi) => pi.ident.clone(),
+                _ => {
+                    let ident = syn::Ident::new(&format!("arg{i}"), Span::call_site());
+                    *pt.pat = syn::Pat::Ident(syn::PatIdent {
+                        attrs: Vec::new(),
+                        by_ref: None,
+                        mutability: None,
+                        ident: ident.clone(),
+                        subpat: None,
+                    });
+                    ident
+                }
+            },
+        };
+        let expr = syn::Expr::Path(syn::ExprPath {
+            attrs: Vec::new(),
+            qself: None,
+            path: syn::Path::from(ident),
+        });
+        arg_exprs.push(expr);
+    }
+
+    let wrapper_expr = syn::Expr::Call(syn::ExprCall {
+        attrs: Vec::new(),
+        func: Box::new(syn::Expr::Path(syn::ExprPath {
+            attrs: Vec::new(),
+            qself: None,
+            path: syn::Path::from(syn::Ident::new(&fn_name, Span::call_site())),
+        })),
+        paren_token: syn::token::Paren::default(),
+        args: arg_exprs.into_iter().collect(),
+    });
+    let wrapper_stmt = syn::Stmt::Expr(wrapper_expr, None);
+    fn_wrapper.block.stmts.push(wrapper_stmt);
+
+    Some(fn_wrapper.into())
+}
+
+/*
+fn span_to_text_range(span: Span) -> TextRange {
+    let span_range = span.byte_range();
+    let lo = TextSize::try_from(span_range.start).unwrap();
+    let hi = TextSize::try_from(span_range.end).unwrap();
+    TextRange::new(lo, hi)
+}
+*/
+
+// Helpers for dealing with nested meta items in attrs, like `#[unsafe(no_mangle)]`
+
+#[derive(Clone)]
+enum ParsedMeta {
+    Meta(syn::Meta),
+    Unsafe(Box<ParsedMetaUnsafe>),
+    NoMangle(ParsedMetaNoMangle),
+    ExportName(ParsedMetaExportName),
+}
+
+#[derive(Clone)]
+struct ParsedMetaUnsafe {
+    ident: syn::Ident,
+    paren: syn::token::Paren,
+    inner: ParsedMeta,
+}
+
+#[derive(Clone)]
+struct ParsedMetaNoMangle {
+    ident: syn::Ident,
+}
+
+#[derive(Clone)]
+struct ParsedMetaExportName {
+    ident: syn::Ident,
+    eq: syn::Token![=],
+    name: syn::LitStr,
+}
+
+impl ParsedMeta {
+    pub fn parse(meta: &syn::Meta) -> syn::Result<ParsedMeta> {
+        let ident = meta.path().require_ident()?;
+        let ident_str = ident.to_string();
+        match ident_str.as_str() {
+            "unsafe" => {
+                let ml = meta.require_list()?;
+                let ident = ml.path.require_ident()?.clone();
+                let paren = match ml.delimiter {
+                    syn::MacroDelimiter::Paren(p) => p,
+                    _ => {
+                        return Err(syn::Error::new(
+                            ml.delimiter.span().open(),
+                            "expected parens",
+                        ));
+                    }
+                };
+                let meta: syn::Meta = syn::parse2(ml.tokens.clone())?;
+                let inner = ParsedMeta::from(meta);
+                Ok(ParsedMeta::Unsafe(Box::new(ParsedMetaUnsafe {
+                    ident,
+                    paren,
+                    inner,
+                })))
+            }
+            "no_mangle" => {
+                let _ = meta.require_path_only()?;
+                let ident = ident.clone();
+                Ok(ParsedMeta::NoMangle(ParsedMetaNoMangle { ident }))
+            }
+            "export_name" => {
+                let mnv = meta.require_name_value()?;
+                let ident = mnv.path.require_ident()?.clone();
+                let eq = mnv.eq_token;
+                let expr_lit = match mnv.value {
+                    syn::Expr::Lit(ref el) => el,
+                    _ => return Err(syn::Error::new(mnv.value.span(), "expected Lit")),
+                };
+                let syn::ExprLit { ref attrs, ref lit } = *expr_lit;
+                if attrs.len() > 0 {
+                    return Err(syn::Error::new(expr_lit.span(), "name must not have attrs"));
+                }
+                let name = match *lit {
+                    syn::Lit::Str(ref ls) => ls.clone(),
+                    _ => return Err(syn::Error::new(lit.span(), "expected Str")),
+                };
+                Ok(ParsedMeta::ExportName(ParsedMetaExportName {
+                    ident,
+                    eq,
+                    name,
+                }))
+            }
+            _ => Ok(ParsedMeta::Meta(meta.clone())),
+        }
+    }
+
+    pub fn with_innermost_mut(&mut self, f: &mut impl FnMut(&mut ParsedMeta)) {
+        match *self {
+            ParsedMeta::Meta(..) | ParsedMeta::NoMangle(..) | ParsedMeta::ExportName(..) => f(self),
+            ParsedMeta::Unsafe(ref mut pmu) => pmu.inner.with_innermost_mut(f),
+        }
+    }
+}
+
+impl From<syn::Meta> for ParsedMeta {
+    fn from(meta: syn::Meta) -> ParsedMeta {
+        match Self::parse(&meta) {
+            Ok(x) => x,
+            Err(e) => {
+                eprintln!("warning: failed to parse `{}`: {e}", meta.to_token_stream());
+                ParsedMeta::Meta(meta)
+            }
+        }
+    }
+}
+
+impl From<ParsedMeta> for syn::Meta {
+    fn from(pm: ParsedMeta) -> syn::Meta {
+        syn::parse2(pm.into_token_stream()).unwrap()
+    }
+}
+
+impl ToTokens for ParsedMeta {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        match *self {
+            ParsedMeta::Meta(ref x) => x.to_tokens(tokens),
+            ParsedMeta::Unsafe(ref x) => x.to_tokens(tokens),
+            ParsedMeta::NoMangle(ref x) => x.to_tokens(tokens),
+            ParsedMeta::ExportName(ref x) => x.to_tokens(tokens),
+        }
+    }
+}
+
+impl ToTokens for ParsedMetaUnsafe {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        self.ident.to_tokens(tokens);
+        self.paren.surround(tokens, |tokens| {
+            self.inner.to_tokens(tokens);
+        });
+    }
+}
+
+impl ToTokens for ParsedMetaNoMangle {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        self.ident.to_tokens(tokens);
+    }
+}
+
+impl ToTokens for ParsedMetaExportName {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        self.ident.to_tokens(tokens);
+        self.eq.to_tokens(tokens);
+        self.name.to_tokens(tokens);
+    }
+}
+
+/// Split FFI entrypoints out of a freshly-transpiled Rust codebase.
+#[derive(Parser)]
+struct Args {
+    /// Directory of Rust project to modify. `Cargo.toml` should reside inside this directory.
+    cargo_dir_path: PathBuf,
+}
+
+fn main() {
+    let args = Args::parse();
+    let cargo_dir_path = Path::new(&args.cargo_dir_path);
+
+    let cargo_config = CargoConfig::default();
+
+    let load_cargo_config: LoadCargoConfig = LoadCargoConfig {
+        load_out_dirs_from_check: true,
+        with_proc_macro_server: ProcMacroServerChoice::Sysroot,
+        prefill_caches: false,
+    };
+
+    let (db, vfs, _proc_macro_client) = ra_ap_load_cargo::load_workspace_at(
+        cargo_dir_path,
+        &cargo_config,
+        &load_cargo_config,
+        &|_msg| {},
+    )
+    .unwrap();
+
+    // Assume the first file in `vfs` is the crate root.
+    let (first_file_id, _) = vfs.iter().next().unwrap();
+
+    let sema = Semantics::new(&db);
+
+    eprintln!("processing crate...");
+    let krate = sema.first_crate(first_file_id).unwrap();
+
+    let mut files = Vec::new();
+    for m in krate.modules(&db) {
+        let src = m.definition_source(&db);
+        let node = src.value.node();
+        if let Some(editioned_file_id) = m.as_source_file_id(&db) {
+            sema.parse(editioned_file_id);
+            let file_id = editioned_file_id.file_id(&db);
+            let vfs_path = vfs.file_path(file_id);
+            if let Some(path) = vfs_path.as_path() {
+                files.push((path.to_path_buf(), node));
+            }
+        }
+    }
+
+    for (path, root) in files {
+        // Only rewrite files that are inside the provided cargo dir.  If our strategy for finding
+        // the main crate is wrong, this will keep us from overwriting files unexpectedly.
+        let mut ancestors = iter::successors(Some(path.as_path()), |p| p.parent());
+        if !ancestors.any(|a| a == cargo_dir_path) {
+            eprintln!("skip {path:?}: outside cargo dir {cargo_dir_path:?}");
+            continue;
+        }
+
+        let code = fs::read_to_string(&path).unwrap();
+
+        let ts = TokenStream::from_str(&code).unwrap();
+        let orig_tokens = FlatTokens::new(ts.clone()).collect::<Vec<_>>();
+        let ti = TokenIndex::new(&orig_tokens);
+
+        let mut ast: syn::File = syn::parse2(ts.clone()).unwrap();
+        let mut v = AddDerivedItemVisitor(|i: &mut syn::Item| -> Option<syn::Item> {
+            add_ffi_wrapper(&db, &sema, root.clone(), i)
+        });
+        v.visit_file_mut(&mut ast);
+
+        let new_ts = ast.into_token_stream();
+
+        let mut buf = OutputBuffer::new();
+        render_output(&code, &orig_tokens, &ti, new_ts, &mut buf);
+        let s = buf.finish();
+        fs::write(&path, &s).unwrap();
+        eprintln!("wrote {:?}", path);
+    }
+}
diff --git a/tools/split_rust/Cargo.lock b/tools/split_rust/Cargo.lock
new file mode 100644
index 0000000000..2cfed465c0
--- /dev/null
+++ b/tools/split_rust/Cargo.lock
@@ -0,0 +1,260 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "anstream"
+version = "0.6.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43d5b281e737544384e969a5ccad3f1cdd24b48086a0fc1b2a5262a26b8f4f4a"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.13"
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+
+[[package]]
+name = "anstyle-parse"
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+checksum = "4e7644824f0aa2c7b9384579234ef10eb7efb6a0deb83f9630a49594dd9c15c2"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
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+ "windows-sys",
+]
+
+[[package]]
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+dependencies = [
+ "anstyle",
+ "once_cell_polyfill",
+ "windows-sys",
+]
+
+[[package]]
+name = "clap"
+version = "4.5.53"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9e340e012a1bf4935f5282ed1436d1489548e8f72308207ea5df0e23d2d03f8"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.5.53"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
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+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
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+
+[[package]]
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+
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+
+[[package]]
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+
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+
+[[package]]
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+
+[[package]]
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diff --git a/tools/split_rust/Cargo.toml b/tools/split_rust/Cargo.toml
new file mode 100644
index 0000000000..0d102961ea
--- /dev/null
+++ b/tools/split_rust/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "split_rust"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rust_util = { path = "../rust_util" }
+
+syn = { version = "2.0.108", features = ["full", "visit"] }
+proc-macro2 = { version = "1", features = ["span-locations"] }
+quote = "1"
+clap = { version = "4.5", features = ["derive"] }
+
+serde_json = "1"
diff --git a/tools/split_rust/src/main.rs b/tools/split_rust/src/main.rs
new file mode 100644
index 0000000000..206d389cad
--- /dev/null
+++ b/tools/split_rust/src/main.rs
@@ -0,0 +1,30 @@
+use clap::Parser;
+use rust_util::collect::FileCollector;
+use rust_util::item_span::item_spans;
+use serde_json;
+use std::collections::HashMap;
+use std::fs;
+use std::path::PathBuf;
+
+/// Split a Rust codebase into a JSON map from item paths to their source text.
+#[derive(Parser)]
+struct Args {
+    /// Root Rust source file to split (`lib.rs` or `main.rs`).
+    src_root_path: PathBuf,
+}
+
+fn main() {
+    let args = Args::parse();
+    let mut fc = FileCollector::default();
+    fc.parse(args.src_root_path, vec![], true).unwrap();
+    let mut out = HashMap::new();
+    for &(ref name, ref mod_path, ref ast) in &fc.files {
+        eprintln!("visit {:?}", name);
+        let src = fs::read_to_string(name).unwrap();
+        for (item_path, lo, hi) in item_spans(mod_path.to_owned(), ast) {
+            let snippet = &src[lo..hi];
+            out.insert(item_path.join("::"), snippet.to_owned());
+        }
+    }
+    serde_json::to_writer(std::io::stdout(), &out).unwrap();
+}