From 031629faa17421174dad6341c69d17860c084ff1 Mon Sep 17 00:00:00 2001
From: Delyan Angelov <delian66@gmail.com>
Date: Thu, 2 Jun 2022 13:35:13 +0300
Subject: [PATCH] tools: add cmd/tools/measure/scanner_speed.v and
 cmd/tools/measure/parser_speed.v

---
 cmd/tools/measure/parser_speed.v  | 67 +++++++++++++++++++++++++++++++
 cmd/tools/measure/scanner_speed.v | 42 +++++++++++++++++++
 vlib/v/parser/parser.v            | 11 ++---
 3 files changed, 115 insertions(+), 5 deletions(-)
 create mode 100644 cmd/tools/measure/parser_speed.v
 create mode 100644 cmd/tools/measure/scanner_speed.v

diff --git a/cmd/tools/measure/parser_speed.v b/cmd/tools/measure/parser_speed.v
new file mode 100644
index 000000000..7b549a7a9
--- /dev/null
+++ b/cmd/tools/measure/parser_speed.v
@@ -0,0 +1,67 @@
+import os
+import time
+import v.ast
+import v.pref
+import v.parser
+import v.errors
+import v.scanner
+
+fn main() {
+	files := os.args#[1..]
+	if files.len > 0 && files[0].starts_with('@') {
+		lst_path := files[0].all_after('@')
+		listed_files := os.read_file(lst_path)?.split('\n')
+		process_files(listed_files)?
+		return
+	}
+	process_files(files)?
+}
+
+fn process_files(files []string) ? {
+	mut table := ast.new_table()
+	mut pref := pref.new_preferences()
+	pref.is_fmt = true
+	pref.skip_warnings = true
+	pref.output_mode = .silent
+	mut sw := time.new_stopwatch()
+	mut total_us := i64(0)
+	mut total_bytes := i64(0)
+	mut total_tokens := i64(0)
+	for f in files {
+		if f == '' {
+			continue
+		}
+		if f.ends_with('_test.v') {
+			continue
+		}
+		// do not measure the scanning, but only the parsing:
+		mut p := new_parser(f, .skip_comments, table, pref)
+		///
+		sw.restart()
+		_ := p.parse()
+		f_us := sw.elapsed().microseconds()
+		///
+		total_us += f_us
+		total_bytes += p.scanner.text.len
+		total_tokens += p.scanner.all_tokens.len
+		println('${f_us:10}us ${p.scanner.all_tokens.len:10} ${p.scanner.text.len:10} ${(f64(p.scanner.text.len) / p.scanner.all_tokens.len):7.3} ${p.errors.len:4} $f')
+	}
+	println('${total_us:10}us ${total_tokens:10} ${total_bytes:10} ${(f64(total_tokens) / total_bytes):7.3} | speed: ${(f64(total_bytes) / total_us):2.5f} MB/s')
+}
+
+fn new_parser(path string, comments_mode scanner.CommentsMode, table &ast.Table, pref &pref.Preferences) &parser.Parser {
+	mut p := &parser.Parser{
+		scanner: scanner.new_scanner_file(path, comments_mode, pref) or { panic(err) }
+		comments_mode: comments_mode
+		table: table
+		pref: pref
+		scope: &ast.Scope{
+			start_pos: 0
+			parent: table.global_scope
+		}
+		errors: []errors.Error{}
+		warnings: []errors.Warning{}
+	}
+	p.set_path(path)
+	return p
+}
diff --git a/cmd/tools/measure/scanner_speed.v b/cmd/tools/measure/scanner_speed.v
new file mode 100644
index 000000000..5697bd5ab
--- /dev/null
+++ b/cmd/tools/measure/scanner_speed.v
@@ -0,0 +1,42 @@
+import os
+import time
+import v.scanner
+import v.pref
+
+fn main() {
+	files := os.args#[1..]
+	if files.len > 0 && files[0].starts_with('@') {
+		lst_path := files[0].all_after('@')
+		listed_files := os.read_file(lst_path)?.split('\n')
+		process_files(listed_files)?
+		return
+	}
+	process_files(files)?
+}
+
+fn process_files(files []string) ? {
+	mut pref := pref.new_preferences()
+	pref.is_fmt = true
+	pref.skip_warnings = true
+	pref.output_mode = .silent
+	mut sw := time.new_stopwatch()
+	mut total_us := i64(0)
+	mut total_bytes := i64(0)
+	mut total_tokens := i64(0)
+	for f in files {
+		if f == '' {
+			continue
+		}
+		if f.ends_with('_test.v') {
+			continue
+		}
+		sw.restart()
+		s := scanner.new_scanner_file(f, .skip_comments, pref)?
+		f_us := sw.elapsed().microseconds()
+		total_us += f_us
+		total_bytes += s.text.len
+		total_tokens += s.all_tokens.len
+		println('${f_us:10}us ${s.all_tokens.len:10} ${s.text.len:10} ${(f64(s.text.len) / s.all_tokens.len):7.3f} $f')
+	}
+	println('${total_us:10}us ${total_tokens:10} ${total_bytes:10} ${(f64(total_tokens) / total_bytes):7.3f} | speed: ${(f64(total_bytes) / total_us):2.5f} MB/s')
+}
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index 2280f7a90..3b66a435f 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -23,7 +23,6 @@ mut:
 	file_name_dir     string       // "/home/user"
 	unique_prefix     string       // a hash of p.file_name, used for making anon fn generation unique
 	file_backend_mode ast.Language // .c for .c.v|.c.vv|.c.vsh files; .js for .js.v files, .amd64/.rv32/other arches for .amd64.v/.rv32.v/etc. files, .v otherwise.
-	scanner           &scanner.Scanner
 	comments_mode     scanner.CommentsMode = .skip_comments
 	// see comment in parse_file
 	tok                       token.Token
@@ -78,10 +77,6 @@ mut:
 	returns                   bool
 	is_stmt_ident             bool // true while the beginning of a statement is an ident/selector
 	expecting_type            bool // `is Type`, expecting type
-	errors                    []errors.Error
-	warnings                  []errors.Warning
-	notices                   []errors.Notice
-	vet_errors                []vet.Error
 	cur_fn_name               string
 	label_names               []string
 	name_error                bool // indicates if the token is not a name or the name is on another line
@@ -95,6 +90,12 @@ mut:
 	if_cond_comments          []ast.Comment
 	script_mode               bool
 	script_mode_start_token   token.Token
+pub mut:
+	scanner &scanner.Scanner
+	errors                    []errors.Error
+	warnings                  []errors.Warning
+	notices                   []errors.Notice
+	vet_errors                []vet.Error
 }
 
 __global codegen_files = []&ast.File{}
-- 
2.30.2