builtin,markused: consider println of non string to use .str() method calls too, reduce generated C code for v -cc gcc examples/hello_world.v (#24996)

vlib/builtin/array.v

@@ -563,15 +563,15 @@ fn (a array) slice(start int, _end int) array {
 	end := if _end == max_int { a.len } else { _end } // max_int
 	$if !no_bounds_checking {
 		if start > end {
-			panic('array.slice: invalid slice index (start>end):' + i64(start).str() + ', ' +
-				i64(end).str())
+			panic('array.slice: invalid slice index (start>end):' + impl_i64_to_string(i64(start)) +
+				', ' + impl_i64_to_string(end))
 		}
 		if end > a.len {
-			panic('array.slice: slice bounds out of range (' + i64(end).str() + ' >= ' +
-				i64(a.len).str() + ')')
+			panic('array.slice: slice bounds out of range (' + impl_i64_to_string(end) + ' >= ' +
+				impl_i64_to_string(a.len) + ')')
 		}
 		if start < 0 {
-			panic('array.slice: slice bounds out of range (start<0):' + start.str())
+			panic('array.slice: slice bounds out of range (start<0):' + impl_i64_to_string(start))
 		}
 	}
 	// TODO: integrate reference counting

vlib/builtin/builtin.c.v

@@ -184,19 +184,20 @@ pub fn c_error_number_str(errnum int) string {
 // panic_n prints an error message, followed by the given number, then exits the process with exit code of 1.
 @[noreturn]
 pub fn panic_n(s string, number1 i64) {
-	panic(s + number1.str())
+	panic(s + impl_i64_to_string(number1))
 }
 
 // panic_n2 prints an error message, followed by the given numbers, then exits the process with exit code of 1.
 @[noreturn]
 pub fn panic_n2(s string, number1 i64, number2 i64) {
-	panic(s + number1.str() + ', ' + number2.str())
+	panic(s + impl_i64_to_string(number1) + ', ' + impl_i64_to_string(number2))
 }
 
 // panic_n3 prints an error message, followed by the given numbers, then exits the process with exit code of 1.
 @[noreturn]
 fn panic_n3(s string, number1 i64, number2 i64, number3 i64) {
-	panic(s + number1.str() + ', ' + number2.str() + ', ' + number2.str())
+	panic(s + impl_i64_to_string(number1) + ', ' + impl_i64_to_string(number2) + ', ' +
+		impl_i64_to_string(number2))
 }
 
 // panic with a C-API error message matching `errnum`

vlib/builtin/int.v

@@ -11,7 +11,7 @@ pub type byte = u8
 
 // ptr_str returns a string with the address of `ptr`.
 pub fn ptr_str(ptr voidptr) string {
-	buf1 := u64(ptr).hex()
+	buf1 := u64_to_hex_no_leading_zeros(u64(ptr), 16)
 	return buf1
 }
 
@@ -182,13 +182,18 @@ pub fn (nn u32) str() string {
 // str returns the value of the `int_literal` as a `string`.
 @[inline]
 pub fn (n int_literal) str() string {
-	return i64(n).str()
+	return impl_i64_to_string(n)
 }
 
 // str returns the value of the `i64` as a `string`.
 // Example: assert i64(-200000).str() == '-200000'
-@[direct_array_access; inline]
+@[inline]
 pub fn (nn i64) str() string {
+	return impl_i64_to_string(nn)
+}
+
+@[direct_array_access]
+fn impl_i64_to_string(nn i64) string {
 	unsafe {
 		mut n := nn
 		mut d := i64(0)

vlib/builtin/string.v

@@ -1168,8 +1168,8 @@ pub fn (s string) substr(start int, _end int) string {
 	end := if _end == max_int { s.len } else { _end } // max_int
 	$if !no_bounds_checking {
 		if start > end || start > s.len || end > s.len || start < 0 || end < 0 {
-			panic('substr(' + start.str() + ', ' + end.str() + ') out of bounds (len=' +
-				s.len.str() + ') s=' + s)
+			panic('substr(' + impl_i64_to_string(start) + ', ' + impl_i64_to_string(end) +
+				') out of bounds (len=' + impl_i64_to_string(s.len) + ') s=' + s)
 		}
 	}
 	len := end - start
@@ -1207,8 +1207,8 @@ pub fn (s string) substr_unsafe(start int, _end int) string {
 pub fn (s string) substr_with_check(start int, _end int) !string {
 	end := if _end == max_int { s.len } else { _end } // max_int
 	if start > end || start > s.len || end > s.len || start < 0 || end < 0 {
-		return error('substr(' + start.str() + ', ' + end.str() + ') out of bounds (len=' +
-			s.len.str() + ')')
+		return error('substr(' + impl_i64_to_string(start) + ', ' + impl_i64_to_string(end) +
+			') out of bounds (len=' + impl_i64_to_string(s.len) + ')')
 	}
 	len := end - start
 	if len == s.len {

vlib/v/markused/markused.v

@@ -311,7 +311,6 @@ pub fn mark_used(mut table ast.Table, mut pref_ pref.Preferences, ast_files []&a
 
 	mut walker := Walker.new(
 		table:         table
-		files:         ast_files
 		all_fns:       all_fns
 		all_consts:    all_consts
 		all_globals:   all_globals

vlib/v/markused/walker.v

@@ -23,7 +23,6 @@ pub mut:
 	used_panic    int // option/result propagation
 	pref          &pref.Preferences = unsafe { nil }
 mut:
-	files         []&ast.File
 	all_fns       map[string]ast.FnDecl
 	all_consts    map[string]ast.ConstField
 	all_globals   map[string]ast.GlobalField
@@ -55,8 +54,8 @@ mut:
 	uses_interp        bool // string interpolation
 	uses_guard         bool
 	uses_orm           bool
-	uses_str           bool // has .str() call
-	uses_free          bool // has .free() call
+	uses_str           map[ast.Type]bool // has .str() calls, and for which types
+	uses_free          map[ast.Type]bool // has .free() calls, and for which types
 	uses_spawn         bool
 	uses_dump          bool
 	uses_memdup        bool // sumtype cast and &Struct{}
@@ -107,9 +106,6 @@ pub fn (mut w Walker) mark_const_as_used(ckey string) {
 		return
 	}
 	w.used_consts[ckey] = true
-	if ckey == 'c' {
-		println(ckey)
-	}
 	cfield := w.all_consts[ckey] or { return }
 	w.expr(cfield.expr)
 	w.mark_by_type(cfield.typ)
@@ -428,10 +424,13 @@ fn (mut w Walker) expr(node_ ast.Expr) {
 				if sym.info is ast.Map {
 					w.mark_by_type(w.table.find_or_register_array(sym.info.key_type))
 				}
-			} else if !w.uses_str && node.is_method && node.name == 'str' {
-				w.uses_str = true
-			} else if !w.uses_free && node.is_method && node.name == 'free' {
-				w.uses_free = true
+			} else if !node.is_method && node.args.len == 1 && node.args[0].typ != ast.string_type
+				&& node.name in ['println', 'print', 'eprint', 'eprintln'] {
+				w.uses_str[node.args[0].typ] = true
+			} else if node.is_method && node.name == 'str' {
+				w.uses_str[node.left_type] = true
+			} else if node.is_method && node.name == 'free' {
+				w.uses_free[node.left_type] = true
 			}
 			if !w.is_builtin_mod && !w.uses_external_type {
 				if node.is_method {
@@ -1295,18 +1294,27 @@ fn (mut w Walker) mark_resource_dependencies() {
 	if w.uses_arr_void {
 		w.mark_by_type(w.table.find_or_register_array(ast.voidptr_type))
 	}
+	for typ, _ in w.table.used_features.print_types {
+		w.mark_by_type(typ)
+	}
 	if w.trace_enabled {
 		types := w.table.used_features.print_types.keys().map(w.table.type_to_str(it))
 		eprintln('>>>>>>>>>> PRINT TYPES ${types}')
 	}
-	for typ, _ in w.table.used_features.print_types {
-		w.mark_by_type(typ)
+	if w.trace_enabled {
+		types := w.uses_str.keys().map(w.table.type_to_str(it))
+		eprintln('>>>>>>>>>> USES .str() CALLS ON TYPES ${types}')
+	}
+	if w.trace_enabled {
+		types := w.uses_free.keys().map(w.table.type_to_str(it))
+		eprintln('>>>>>>>>>> USES .free() CALLS ON TYPES ${types}')
 	}
 	if w.trace_enabled {
 		eprintln('>>>>>>>>>> ALL_FNS LOOP')
 	}
 	mut has_ptr_print := false
-	has_str_call := w.uses_interp || w.uses_asserts || w.uses_str || w.features.print_types.len > 0
+	has_str_call := w.uses_interp || w.uses_asserts || w.uses_str.len > 0
+		|| w.features.print_types.len > 0
 	for k, mut func in w.all_fns {
 		if has_str_call && k.ends_with('.str') {
 			if func.receiver.typ.idx() in w.used_syms {
@@ -1318,7 +1326,7 @@ fn (mut w Walker) mark_resource_dependencies() {
 			}
 			continue
 		}
-		if w.pref.autofree || (w.uses_free && k.ends_with('.free')
+		if w.pref.autofree || (w.uses_free.len > 0 && k.ends_with('.free')
 			&& func.receiver.typ.idx() in w.used_syms) {
 			w.fn_by_name(k)
 			continue