Eliminate reader_current_filename

Store this in the parser libdata instead.

src/builtin_source.cpp

@@ -74,7 +74,8 @@ int builtin_source(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
     }
 
     const block_t *sb = parser.push_block(block_t::source_block(fn_intern));
-    reader_push_current_filename(fn_intern);
+    auto &ld = parser.libdata();
+    scoped_push<const wchar_t *> filename_push{&ld.current_filename, fn_intern};
 
     // This is slightly subtle. If this is a bare `source` with no args then `argv + optind` already
     // points to the end of argv. Otherwise we want to skip the file name to get to the args if any.
@@ -95,6 +96,5 @@ int builtin_source(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
 
     // Do not close fd after calling reader_read. reader_read automatically closes it before calling
     // eval.
-    reader_pop_current_filename();
     return retval;
 }

src/exec.cpp

@@ -676,7 +676,7 @@ static bool handle_builtin_output(parser_t &parser, const std::shared_ptr<job_t>
 
 /// Executes an external command.
 /// \return true on success, false if there is an exec error.
-static bool exec_external_command(env_stack_t &vars, const std::shared_ptr<job_t> &j, process_t *p,
+static bool exec_external_command(parser_t &parser, const std::shared_ptr<job_t> &j, process_t *p,
                                   const io_chain_t &proc_io_chain) {
     assert(p->type == process_type_t::external && "Process is not external");
     // Get argv and envv before we fork.
@@ -694,14 +694,13 @@ static bool exec_external_command(env_stack_t &vars, const std::shared_ptr<job_t
     // (/dev/tty?).
     make_fd_blocking(STDIN_FILENO);
 
-    auto export_arr = vars.export_arr();
-    ;
+    auto export_arr = parser.vars().export_arr();
     const char *const *argv = argv_array.get();
     const char *const *envv = export_arr->get();
 
     std::string actual_cmd_str = wcs2string(p->actual_cmd);
     const char *actual_cmd = actual_cmd_str.c_str();
-    const wchar_t *file = reader_current_filename();
+    const wchar_t *file = parser.libdata().current_filename;
 
 #if FISH_USE_POSIX_SPAWN
     // Prefer to use posix_spawn, since it's faster on some systems like OS X.
@@ -979,7 +978,7 @@ static bool exec_process_in_job(parser_t &parser, process_t *p, std::shared_ptr<
         }
 
         case process_type_t::external: {
-            if (!exec_external_command(parser.vars(), j, p, process_net_io_chain)) {
+            if (!exec_external_command(parser, j, p, process_net_io_chain)) {
                 return false;
             }
             break;

src/fish.cpp

@@ -47,6 +47,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 #include "function.h"
 #include "future_feature_flags.h"
 #include "history.h"
+#include "intern.h"
 #include "io.h"
 #include "parser.h"
 #include "path.h"
@@ -466,18 +467,15 @@ int main(int argc, char **argv) {
                 }
                 parser.vars().set(L"argv", ENV_DEFAULT, list);
 
-                const wcstring rel_filename = str2wcstring(file);
-
-                reader_push_current_filename(rel_filename.c_str());
-
+                auto &ld = parser.libdata();
+                wcstring rel_filename = str2wcstring(file);
+                scoped_push<const wchar_t *> filename_push{&ld.current_filename,
+                                                           intern(rel_filename.c_str())};
                 res = reader_read(fd, {});
-
                 if (res) {
                     debug(1, _(L"Error while reading file %ls\n"),
-                          reader_current_filename() ? reader_current_filename()
-                                                    : _(L"Standard input"));
+                          ld.current_filename ? ld.current_filename : _(L"Standard input"));
                 }
-                reader_pop_current_filename();
             }
         }
     }

src/function.cpp

@@ -190,7 +190,7 @@ void function_add(const function_data_t &data, const parser_t &parser) {
     bool is_autoload = funcset->autoloader.autoload_in_progress(data.name);
 
     // Create and store a new function.
-    const wchar_t *filename = reader_current_filename();
+    const wchar_t *filename = parser.libdata().current_filename;
     auto ins = funcset->funcs.emplace(data.name,
                                       function_info_t(data, parser.vars(), filename, is_autoload));
     assert(ins.second && "Function should not already be present in the table");

src/parser.cpp

@@ -498,12 +498,8 @@ const wchar_t *parser_t::current_filename() const {
         }
     }
 
-    // We query a global array for the current file name, but only do that if we are the principal
-    // parser.
-    if (this == &principal_parser()) {
-        return reader_current_filename();
-    }
-    return NULL;
+    // Fall back to the file being sourced.
+    return libdata().current_filename;
 }
 
 wcstring parser_t::current_line() {

src/parser.h

@@ -156,6 +156,10 @@ struct library_data_t {
 
     /// Whether we should return from the current function.
     bool returning{false};
+
+    /// The current filename we are evaluating, either from builtin source or on the command line.
+    /// This is an intern'd string.
+    const wchar_t *current_filename{};
 };
 
 class parser_t : public std::enable_shared_from_this<parser_t> {

src/reader.cpp

@@ -482,9 +482,6 @@ class reader_data_t : public std::enable_shared_from_this<reader_data_t> {
 /// handled by the fish interrupt handler.
 static volatile sig_atomic_t is_interactive_read;
 
-/// The stack containing names of files that are being parsed.
-static std::stack<const wchar_t *, std::vector<const wchar_t *>> current_filename;
-
 /// This variable is set to true by the signal handler when ^C is pressed.
 static volatile sig_atomic_t interrupted = 0;
 
@@ -689,21 +686,6 @@ void reader_handle_sigint() {
     interrupted = 1;
 }
 
-const wchar_t *reader_current_filename() {
-    ASSERT_IS_MAIN_THREAD();
-    return current_filename.empty() ? NULL : current_filename.top();
-}
-
-void reader_push_current_filename(const wchar_t *fn) {
-    ASSERT_IS_MAIN_THREAD();
-    current_filename.push(intern(fn));
-}
-
-void reader_pop_current_filename() {
-    ASSERT_IS_MAIN_THREAD();
-    current_filename.pop();
-}
-
 /// Make sure buffers are large enough to hold the current string length.
 void reader_data_t::command_line_changed(const editable_line_t *el) {
     ASSERT_IS_MAIN_THREAD();

src/reader.h

@@ -64,20 +64,9 @@ void reader_init();
 /// Restore the term mode at startup.
 void restore_term_mode();
 
-/// Returns the filename of the file currently read.
-const wchar_t *reader_current_filename();
-
-/// Push a new filename on the stack of read files.
-///
-/// \param fn The fileanme to push
-void reader_push_current_filename(const wchar_t *fn);
-
 /// Change the history file for the current command reading context.
 void reader_change_history(const wcstring &name);
 
-/// Pop the current filename from the stack of read files.
-void reader_pop_current_filename();
-
 /// Write the title to the titlebar. This function is called just before a new application starts
 /// executing and just after it finishes.
 ///