mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
299 lines
10 KiB
V
299 lines
10 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(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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}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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// 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}: $final_message')
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if s.should_print_line_on_error && s.nlines > 0 {
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context_start_line := imax(0, (s.line_nr - error_context_before ))
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context_end_line := imin(s.nlines-1, (s.line_nr + error_context_after + 1 ))
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for cline := context_start_line; cline < context_end_line; cline++ {
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line := '${(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 { continue }
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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] fn (p &Parser) cur_tok_index() int { return p.token_idx - 1 }
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[inline] fn imax(a,b int) int { return if a > b { a } else { b } }
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[inline] fn imin(a,b int) int { return if a < b { a } else { b } }
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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' { true }
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'absolute' { false }
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else { s.should_print_relative_paths_on_error }
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}
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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.should_print_errors_in_color && 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 normalized_error( s string ) string {
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// Print `[]int` instead of `array_int` in errors
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return s.replace('array_', '[]')
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.replace('__', '.')
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.replace('Option_', '?')
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.replace('main.', '')
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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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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{ pos: s.pos line_nr: s.line_nr last_nl_pos: s.last_nl_pos }
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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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// get_scanner_pos_of_token rescans *the whole source* till it reaches {t.line_nr, t.col} .
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fn (s mut Scanner) get_scanner_pos_of_token(t &Token) ScannerPos {
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// This rescanning is done just once on error, so it is fine for now.
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// Be careful for the performance implications, if you want to
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// do it more frequently. The alternative would be to store
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// the scanpos (12 bytes) for each token, and there are potentially many tokens.
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tline := t.line_nr
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tcol := if t.line_nr == 0 { t.col + 1 } else { t.col - 1 }
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// save the current scanner position, it will be restored later
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cpos := s.get_scanner_pos()
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mut sptoken := ScannerPos{}
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// Starting from the start, scan the source lines
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// till the desired tline is reached, then
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// s.pos + tcol would be the proper position
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// of the token.
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s.goto_scanner_position(ScannerPos{})
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mut prevlinepos := 0
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// NB: TCC BUG workaround: removing the `mut ate:=0 ate++` line
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// below causes a bug in v, when v is compiled with tcc, and v
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// wants to report the error: 'the following imports were never used:'
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//
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// This can be reproduced, if you follow the steps:
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// a) ./v -cc tcc -o v compiler ;
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// b) ./v vlib/builtin/hashmap_test.v'
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//
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// In this case, prevlinepos gets a random value on each run.
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// Any kind of operation may be used seemingly, as long as
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// there is a new stack allocation that will 'protect' prevlinepos.
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//////////////////////////////////////////////////////////////////
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mut ate:=0 ate++ // This var will be smashed by TCC, instead of
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/////////////////// prevlinepos. The cause is the call to
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/////////////////// s.get_scanner_pos()
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/////////////////// which just returns a struct, and that works
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/////////////////// in gcc and clang, but causes the TCC problem.
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maxline := imin( s.nlines, tline + 2 * error_context_after)
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for {
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prevlinepos = s.pos
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if s.pos >= s.text.len { break }
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if s.line_nr > maxline { break }
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////////////////////////////////////////
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if tline == s.line_nr {
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sptoken = s.get_scanner_pos()
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sptoken.pos += tcol
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}
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s.ignore_line() s.eat_single_newline()
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}
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//////////////////////////////////////////////////
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s.goto_scanner_position(cpos)
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return sptoken
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}
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fn (s mut Scanner) eat_single_newline(){
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if s.pos >= s.text.len { return }
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if s.expect('\r\n', s.pos) { s.pos += 2 return }
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if s.text[ s.pos ] == `\n` { s.pos ++ return }
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if s.text[ s.pos ] == `\r` { s.pos ++ return }
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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`: ' +
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'`$f.name($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' +
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'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' +
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'for example: `(a && b) || c` instead of `a && b || c`'
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)
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