ZJIT: Fix HIR file persistence and aggregation script parsing

Write HIR source and address map files to ~/.zjit/ which survives
samply's /tmp cleanup. Fix address map parser to handle function names
containing spaces.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: tekknolagi

tool/zjit_hir_aggregate.rb

@@ -73,11 +73,12 @@ def parse_address_map(path)
   File.readlines(path).each do |line|
     line.chomp!
     if line.start_with?("F ")
+      # F zjit::name with spaces 0xaddr size
+      # Parse from the end since name can contain spaces
       parts = line.split(" ")
-      # F zjit::name 0xaddr size
-      name = parts[1]
-      code_addr = Integer(parts[2])
-      code_size = Integer(parts[3])
+      code_size = Integer(parts[-1])
+      code_addr = Integer(parts[-2])
+      name = parts[1...-2].join(" ")
       current_func = { name: name, code_addr: code_addr, code_size: code_size, debug_entries: [] }
       functions[code_addr] = current_func
     elsif line.strip =~ /^(0x[0-9a-f]+)\s+(\d+)$/ && current_func

zjit/src/codegen.rs

@@ -47,8 +47,7 @@ fn get_jitdump() -> Option<&'static JitdumpWriter> {
 fn get_hir_file_path() -> &'static str {
     HIR_FILE_PATH.get_or_init(|| {
         let pid = std::process::id();
-        // Write to home directory so samply's /tmp cleanup won't delete it
-        let home = std::env::var("HOME").unwrap_or_else(|_| "/tmp".to_string());
+        let home = std::env::var("HOME").unwrap_or_else(|_| ".".to_string());
         let dir = format!("{home}/.zjit");
         let _ = std::fs::create_dir_all(&dir);
         format!("{dir}/hir-{pid}.src")