319 lines
9.8 KiB
V
319 lines
9.8 KiB
V
module compiler
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import (
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os
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term
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)
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// ////////////////////////////////////////////////////////////////////////////////////////////////
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// NB: The code in this file is organized in layers (between the ///// lines).
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// This allows for easier keeping in sync of error/warn functions.
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// The functions in each of the layers, call the functions from the layers *below*.
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// The functions in each of the layers, also have more details about the warn/error situation,
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// so they can display more informative message, so please call the lowest level variant you can.
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// ////////////////////////////////////////////////////////////////////////////////////////////////
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// TLDR: If you have a token index, call:
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// p.error_with_token_index(msg, token_index)
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// ... not just :
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// p.error(msg)
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// ////////////////////////////////////////////////////////////////////////////////////////////////
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fn (p mut Parser) error(s string) {
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// no positioning info, so just assume that the last token was the culprit:
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p.error_with_token_index(s, p.token_idx - 1)
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}
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fn (p mut Parser) warn_or_error(s string) {
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if p.pref.is_prod {
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p.error(s)
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} else {
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p.warn(s)
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}
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}
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fn (p mut Parser) warn(s string) {
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p.warn_with_token_index(s, p.token_idx - 1)
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}
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fn (p mut Parser) production_error_with_token_index(e string, tokenindex int) {
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if p.pref.is_prod {
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p.error_with_token_index(e, tokenindex)
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}
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else {
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p.warn_with_token_index(e, tokenindex)
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}
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}
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fn (p mut Parser) error_with_token_index(s string, tokenindex int) {
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p.error_with_position(s, p.scanner.get_scanner_pos_of_token(p.tokens[tokenindex]))
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}
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fn (p mut Parser) warn_with_token_index(s string, tokenindex int) {
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p.warn_with_position(s, p.scanner.get_scanner_pos_of_token(p.tokens[tokenindex]))
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}
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fn (p mut Parser) error_with_position(s string, sp ScannerPos) {
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p.print_error_context()
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e := normalized_error(s)
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p.scanner.goto_scanner_position(sp)
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p.scanner.error_with_col(e, sp.pos - sp.last_nl_pos)
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}
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fn (p mut Parser) warn_with_position(s string, sp ScannerPos) {
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if p.scanner.is_fmt {
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return
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}
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// on a warning, restore the scanner state after printing the warning:
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cpos := p.scanner.get_scanner_pos()
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e := normalized_error(s)
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p.scanner.goto_scanner_position(sp)
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p.scanner.warn_with_col(e, sp.pos - sp.last_nl_pos)
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p.scanner.goto_scanner_position(cpos)
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}
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fn (s &Scanner) error(msg string) {
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s.error_with_col(msg, 0)
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}
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fn (s &Scanner) warn(msg string) {
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s.warn_with_col(msg, 0)
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}
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fn (s &Scanner) warn_with_col(msg string, col int) {
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fullpath := s.get_error_filepath()
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color_on := s.is_color_output_on()
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final_message := if color_on { term.bold(term.bright_blue(msg)) } else { msg }
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eprintln('warning: ${fullpath}:${s.line_nr+1}:${col}: $final_message')
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}
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fn (s &Scanner) error_with_col(msg string, col int) {
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fullpath := s.get_error_filepath()
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color_on := s.is_color_output_on()
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final_message := if color_on { term.red(term.bold(msg)) } else { msg }
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// The filepath:line:col: format is the default C compiler
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// error output format. It allows editors and IDE's like
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// emacs to quickly find the errors in the output
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// and jump to their source with a keyboard shortcut.
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// NB: using only the filename may lead to inability of IDE/editors
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// to find the source file, when the IDE has a different working folder than v itself.
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eprintln('${fullpath}:${s.line_nr + 1}:${col}: $final_message')
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if s.print_line_on_error && s.nlines > 0 {
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context_start_line := imax(0, (s.line_nr - error_context_before))
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context_end_line := imin(s.nlines - 1, (s.line_nr + error_context_after + 1))
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for cline := context_start_line; cline < context_end_line; cline++ {
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line := '${(cline+1):5d}| ' + s.line(cline)
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coloredline := if cline == s.line_nr && color_on { term.red(line) } else { line }
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eprintln(coloredline)
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if cline != s.line_nr {
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continue
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}
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// The pointerline should have the same spaces/tabs as the offending
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// line, so that it prints the ^ character exactly on the *same spot*
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// where it is needed. That is the reason we can not just
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// use strings.repeat(` `, col) to form it.
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mut pointerline := []string
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for i, c in line {
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if i < col {
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x := if c.is_space() { c } else { ` ` }
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pointerline << x.str()
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continue
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}
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pointerline << if color_on { term.bold(term.blue('^')) } else { '^' }
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break
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}
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eprintln(' ' + pointerline.join(''))
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}
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}
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exit(1)
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}
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// ////////////////////////////////////////////////////////////////////////////////////////////////
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// / Misc error helper functions, can be called by any of the functions above
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[inline]
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fn (p &Parser) cur_tok_index() int {
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return p.token_idx - 1
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}
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[inline]
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fn imax(a, b int) int {
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return if a > b { a } else { b }
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}
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[inline]
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fn imin(a, b int) int {
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return if a < b { a } else { b }
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}
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fn (s &Scanner) get_error_filepath() string {
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verror_paths_override := os.getenv('VERROR_PATHS')
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use_relative_paths := match verror_paths_override {
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'relative'{
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true
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}
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'absolute'{
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false
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}
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else {
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s.print_rel_paths_on_error}}
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if use_relative_paths {
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workdir := os.getwd() + os.path_separator
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if s.file_path.starts_with(workdir) {
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return s.file_path.replace(workdir, '')
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}
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return s.file_path
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}
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return os.realpath(s.file_path)
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}
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fn (s &Scanner) is_color_output_on() bool {
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return s.print_colored_error && term.can_show_color_on_stderr()
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}
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fn (p mut Parser) print_error_context() {
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// Dump all vars and types for debugging
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if p.pref.is_debug {
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// os.write_to_file('/var/tmp/lang.types', '')//pes(p.table.types))
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os.write_file('fns.txt', p.table.debug_fns())
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}
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if p.pref.is_verbose || p.pref.is_debug {
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println('pass=$p.pass fn=`$p.cur_fn.name`\n')
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}
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p.cgen.save()
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// V up hint
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cur_path := os.getwd()
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if !p.pref.is_repl && !p.pref.is_test && (p.file_path.contains('v/compiler') || cur_path.contains('v/compiler')) {
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println('\n=========================')
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println('It looks like you are building V. It is being frequently updated every day.')
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println("If you didn\'t modify V\'s code, most likely there was a change that ")
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println('lead to this error.')
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println('\nRun `v up`, that will most likely fix it.')
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// println('\nIf this doesn\'t help, re-install V from source or download a precompiled' + ' binary from\nhttps://vlang.io.')
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println("\nIf this doesn\'t help, please create a GitHub issue.")
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println('=========================\n')
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}
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if p.pref.is_debug {
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print_backtrace()
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}
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// p.scanner.debug_tokens()
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}
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fn ienv_default(ename string, idefault int) int {
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es := os.getenv(ename)
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if es.len == 0 { return idefault }
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return es.int()
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}
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// print_current_tokens/1 pretty prints the current token context, like this:
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// // Your label: tokens[ 32] = Token{ .line: 8, .pos: 93, .tok: 85 } = mut
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// // Your label: tokens[> 33] = Token{ .line: 8, .pos: 95, .tok: 1 } = b
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// // Your label: tokens[ 34] = Token{ .line: 8, .pos: 98, .tok: 31 } = :=
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// It is useful while debugging the v compiler itself. > marks p.token_idx
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fn (p &Parser) print_current_tokens(label string){
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btokens := ienv_default('V_BTOKENS', 5)
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atokens := ienv_default('V_ATOKENS', 5)
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ctoken_idx := p.token_idx
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stoken_idx := imax(0, ctoken_idx - btokens)
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etoken_idx := imin( ctoken_idx + atokens + 1, p.tokens.len)
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for i := stoken_idx; i < etoken_idx; i++ {
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idx := if i == ctoken_idx {
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'>${i:3d}'
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} else {
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' ${i:3d}'
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}
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eprintln('$label: tokens[$idx] = ' + p.tokens[ i ].detailed_str())
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}
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}
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fn normalized_error(s string) string {
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mut res := s
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if !res.contains('__') {
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// `[]int` instead of `array_int`
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res = res.replace('array_', '[]')
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}
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res = res.replace('__', '.')
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res = res.replace('Option_', '?')
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res = res.replace('main.', '')
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res = res.replace('ptr_', '&')
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res = res.replace('_dot_', '.')
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if res.contains('_V_MulRet_') {
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res = res.replace('_V_MulRet_', '(')
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res = res.replace('_V_', ', ')
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res = res[..res.len - 1] + ')"' //"// quote balance comment. do not remove
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}
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return res
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}
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// ////////////////////////////////////////////////////////////////////////////////////////////////
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// The goal of ScannerPos is to track the current scanning position,
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// so that if there is an error found later, v could show a more accurate
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// position about where the error initially was.
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// NB: The fields of ScannerPos *should be kept synchronized* with the
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// corresponding fields in Scanner.
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struct ScannerPos {
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mut:
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pos int
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line_nr int
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last_nl_pos int
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}
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pub fn (s ScannerPos) str() string {
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return 'ScannerPos{ ${s.pos:5d} , ${s.line_nr:5d} , ${s.last_nl_pos:5d} }'
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}
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fn (s &Scanner) get_scanner_pos() ScannerPos {
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return ScannerPos{
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pos: s.pos
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line_nr: s.line_nr
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last_nl_pos: s.last_nl_pos
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}
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}
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fn (s mut Scanner) goto_scanner_position(scp ScannerPos) {
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s.pos = scp.pos
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s.line_nr = scp.line_nr
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s.last_nl_pos = scp.last_nl_pos
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}
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fn (s &Scanner) get_last_nl_from_pos(_pos int) int {
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pos := if _pos >= s.text.len { s.text.len - 1 } else { _pos }
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for i := pos; i >= 0; i-- {
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if s.text[i] == `\n` {
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return i
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}
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}
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return 0
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}
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fn (s &Scanner) get_scanner_pos_of_token(tok &Token) ScannerPos {
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return ScannerPos{
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pos: tok.pos
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line_nr: tok.line_nr
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last_nl_pos: s.get_last_nl_from_pos(tok.pos)
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}
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}
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// /////////////////////////////
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fn (p mut Parser) mutable_arg_error(i int, arg Var, f Fn) {
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mut dots_example := 'mut $p.lit'
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if i > 0 {
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dots_example = '.., ' + dots_example
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}
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if i < f.args.len - 1 {
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dots_example = dots_example + ',..'
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}
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p.error('`$arg.name` is a mutable argument, you need to provide `mut`: ' + '`$f.name ($dots_example)`')
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}
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const (
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warn_match_arrow = '=> is no longer needed in match statements, use\n' + 'match foo {
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1 { bar }
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2 { baz }
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else { ... }
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}'
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// make_receiver_mutable =
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err_used_as_value = 'used as value'
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and_or_error = 'use `()` to make the boolean expression clear\n' + 'for example: `(a && b) || c` instead of `a && b || c`'
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err_modify_bitfield = 'to modify a bitfield flag use the methods: set, clear, toggle. and to check for flag use: has'
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)
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