Minor cleanup of parser interface

src/fish.cpp

@@ -184,9 +184,9 @@ static void source_config_in_directory(const wcstring &dir) {
 
     const wcstring cmd = L"builtin source " + escaped_pathname;
     parser_t &parser = parser_t::principal_parser();
-    parser.set_is_within_fish_initialization(true);
+    set_is_within_fish_initialization(true);
     parser.eval(cmd, io_chain_t(), TOP);
-    parser.set_is_within_fish_initialization(false);
+    set_is_within_fish_initialization(false);
 }
 
 /// Parse init files. exec_path is the path of fish executable as determined by argv[0].

src/fish_tests.cpp

@@ -2142,7 +2142,7 @@ static void test_is_potential_path() {
 /// Test the 'test' builtin.
 int builtin_test(parser_t &parser, io_streams_t &streams, wchar_t **argv);
 static bool run_one_test_test(int expected, wcstring_list_t &lst, bool bracket) {
-    parser_t parser;
+    parser_t &parser = parser_t::principal_parser();
     size_t i, count = lst.size();
     wchar_t **argv = new wchar_t *[count + 3];
     argv[0] = (wchar_t *)(bracket ? L"[" : L"test");
@@ -2185,7 +2185,7 @@ static bool run_test_test(int expected, const wcstring &str) {
 
 static void test_test_brackets() {
     // Ensure [ knows it needs a ].
-    parser_t parser;
+    parser_t &parser = parser_t::principal_parser();
     io_streams_t streams(0);
 
     null_terminated_array_t<wchar_t> args;
@@ -4389,7 +4389,7 @@ static void test_pcre2_escape() {
 int builtin_string(parser_t &parser, io_streams_t &streams, wchar_t **argv);
 static void run_one_string_test(const wchar_t *const *argv, int expected_rc,
                                 const wchar_t *expected_out) {
-    parser_t parser;
+    parser_t &parser = parser_t::principal_parser();
     io_streams_t streams(0);
     streams.stdin_is_directly_redirected = false;  // read from argv instead of stdin
     int rc = builtin_string(parser, streams, const_cast<wchar_t **>(argv));

src/parser.cpp

@@ -100,26 +100,22 @@ static wcstring user_presentable_path(const wcstring &path) {
     return replace_home_directory_with_tilde(path);
 }
 
-parser_t::parser_t() : cancellation_requested(false), is_within_fish_initialization(false) {}
+parser_t::parser_t() = default;
 
 // Out of line destructor to enable forward declaration of parse_execution_context_t
 parser_t::~parser_t() = default;
 
-static parser_t s_principal_parser;
+parser_t parser_t::principal;
 
 parser_t &parser_t::principal_parser() {
     ASSERT_IS_MAIN_THREAD();
-    return s_principal_parser;
-}
-
-void parser_t::set_is_within_fish_initialization(bool flag) {
-    is_within_fish_initialization = flag;
+    return principal;
 }
 
 void parser_t::skip_all_blocks() {
     // Tell all blocks to skip.
     // This may be called from a signal handler!
-    s_principal_parser.cancellation_requested = true;
+    principal.cancellation_requested = true;
 }
 
 // Given a new-allocated block, push it onto our block stack, acquiring ownership
@@ -399,7 +395,7 @@ void parser_t::stack_trace_internal(size_t block_idx, wcstring *buff) const {
         if (file) {
             append_format(*buff, _(L"\tcalled on line %d of file %ls\n"), b->src_lineno,
                           user_presentable_path(file).c_str());
-        } else if (is_within_fish_initialization) {
+        } else if (is_within_fish_initialization()) {
             append_format(*buff, _(L"\tcalled during startup\n"));
         } else {
             append_format(*buff, _(L"\tcalled on standard input\n"));
@@ -536,7 +532,7 @@ wcstring parser_t::current_line() {
         if (file) {
             append_format(prefix, _(L"%ls (line %d): "), user_presentable_path(file).c_str(),
                           lineno);
-        } else if (is_within_fish_initialization) {
+        } else if (is_within_fish_initialization()) {
             append_format(prefix, L"%ls (line %d): ", _(L"Startup"), lineno);
         } else {
             append_format(prefix, L"%ls (line %d): ", _(L"Standard input"), lineno);

src/parser.h

@@ -162,9 +162,7 @@ class parser_t {
 
    private:
     /// Indication that we should skip all blocks.
-    volatile sig_atomic_t cancellation_requested;
-    /// Indicates that we are within the process of initializing fish.
-    bool is_within_fish_initialization;
+    volatile sig_atomic_t cancellation_requested = false;
     /// The current execution context.
     std::unique_ptr<parse_execution_context_t> execution_context;
     /// List of called functions, used to help prevent infinite recursion.
@@ -206,6 +204,12 @@ class parser_t {
     /// Helper for push_block()
     void push_block_int(block_t *b);
 
+    /// Create a parser.
+    parser_t();
+
+    /// The main parser.
+    static parser_t principal;
+
    public:
     /// Get the "principal" parser, whatever that is.
     static parser_t &principal_parser();
@@ -214,9 +218,6 @@ class parser_t {
     /// from signal handlers!
     static void skip_all_blocks();
 
-    /// Create a parser.
-    parser_t();
-
     /// Global event blocks.
     event_blockage_list_t global_event_blocks;
 
@@ -270,10 +271,6 @@ class parser_t {
     /// Get the list of jobs.
     job_list_t &job_list() { return my_job_list; }
 
-    // Hackish. In order to correctly report the origin of code with no associated file, we need to
-    // know whether it's run during initialization or not.
-    void set_is_within_fish_initialization(bool flag);
-
     /// Pushes a new block created with the given arguments
     /// Returns a pointer to the block. The pointer is valid
     /// until the call to pop_block()

src/proc.cpp

@@ -13,6 +13,7 @@
 #include <unistd.h>
 #include <wchar.h>
 #include <wctype.h>
+#include <atomic>
 
 #if HAVE_TERM_H
 #include <curses.h>
@@ -1289,3 +1290,9 @@ void hup_background_jobs() {
         }
     }
 }
+
+static std::atomic<bool> s_is_within_fish_initialization{false};
+
+void set_is_within_fish_initialization(bool flag) { s_is_within_fish_initialization.store(flag); }
+
+bool is_within_fish_initialization() { return s_is_within_fish_initialization.load(); }

src/proc.h

@@ -399,6 +399,12 @@ int proc_format_status(int status);
 /// Wait for any process finishing.
 pid_t proc_wait_any();
 
+/// Set and get whether we are in initialization.
+// Hackish. In order to correctly report the origin of code with no associated file, we need to
+// know whether it's run during initialization or not.
+void set_is_within_fish_initialization(bool flag);
+bool is_within_fish_initialization();
+
 /// Terminate all background jobs
 void hup_background_jobs();