1 files changed, 40 insertions, 0 deletions
diff --git a/tools/profiler/rust-helper/src/compact_symbol_table.rs b/tools/profiler/rust-helper/src/compact_symbol_table.rs
new file mode 100644
index 0000000000..12c4ca081b
--- /dev/null
+++ b/tools/profiler/rust-helper/src/compact_symbol_table.rs
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use std::collections::HashMap;
+use thin_vec::ThinVec;
+
+#[repr(C)]
+pub struct CompactSymbolTable {
+    pub addr: ThinVec<u32>,
+    pub index: ThinVec<u32>,
+    pub buffer: ThinVec<u8>,
+}
+
+impl CompactSymbolTable {
+    pub fn new() -> Self {
+        Self {
+            addr: ThinVec::new(),
+            index: ThinVec::new(),
+            buffer: ThinVec::new(),
+        }
+    }
+
+    pub fn from_map(map: HashMap<u32, &str>) -> Self {
+        let mut table = Self::new();
+        let mut entries: Vec<_> = map.into_iter().collect();
+        entries.sort_by_key(|&(addr, _)| addr);
+        for (addr, name) in entries {
+            table.addr.push(addr);
+            table.index.push(table.buffer.len() as u32);
+            table.add_name(name);
+        }
+        table.index.push(table.buffer.len() as u32);
+        table
+    }
+
+    fn add_name(&mut self, name: &str) {
+        self.buffer.extend_from_slice(name.as_bytes());
+    }
+}