gotosocial/vendor/modernc.org/cc/v3/cpp.go
2021-11-27 15:26:58 +01:00

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// Copyright 2019 The CC Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cc // import "modernc.org/cc/v3"
import (
"bytes"
"fmt"
gotoken "go/token"
"math"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"time"
"unicode/utf8"
"modernc.org/token"
)
const (
maxIncludeLevel = 200 // gcc, std is at least 15.
)
var (
_ tokenReader = (*cpp)(nil)
_ tokenWriter = (*cpp)(nil)
idCOUNTER = dict.sid("__COUNTER__")
idCxLimitedRange = dict.sid("CX_LIMITED_RANGE")
idDATE = dict.sid("__DATE__")
idDefault = dict.sid("DEFAULT")
idDefined = dict.sid("defined")
idEmptyString = dict.sid(`""`)
idFILE = dict.sid("__FILE__")
idFPContract = dict.sid("FP_CONTRACT")
idFdZero = dict.sid("FD_ZERO")
idFenvAccess = dict.sid("FENV_ACCESS")
idGNUC = dict.sid("__GNUC__")
idHasIncludeImpl = dict.sid("__has_include_impl")
idIntMaxWidth = dict.sid("__INTMAX_WIDTH__")
idL = dict.sid("L")
idLINE = dict.sid("__LINE__")
idNL = dict.sid("\n")
idOff = dict.sid("OFF")
idOn = dict.sid("ON")
idOne = dict.sid("1")
idPragmaSTDC = dict.sid("__pragma_stdc")
idSTDC = dict.sid("STDC")
idTIME = dict.sid("__TIME__")
idTclDefaultDoubleRounding = dict.sid("TCL_DEFAULT_DOUBLE_ROUNDING")
idTclIeeeDoubleRounding = dict.sid("TCL_IEEE_DOUBLE_ROUNDING")
idVaArgs = dict.sid("__VA_ARGS__")
idZero = dict.sid("0")
cppTokensPool = sync.Pool{New: func() interface{} { r := []cppToken{}; return &r }}
protectedMacros = hideSet{ // [0], 6.10.8, 4
dict.sid("__STDC_HOSTED__"): {},
dict.sid("__STDC_IEC_559_COMPLEX__"): {},
dict.sid("__STDC_IEC_559__"): {},
dict.sid("__STDC_ISO_10646__"): {},
dict.sid("__STDC_MB_MIGHT_NEQ_WC__"): {},
dict.sid("__STDC_VERSION__"): {},
dict.sid("__STDC__"): {},
idCOUNTER: {},
idDATE: {},
idFILE: {},
idLINE: {},
idTIME: {},
}
)
type tokenReader interface {
read() (cppToken, bool)
unget(cppToken)
ungets([]cppToken)
}
type tokenWriter interface {
write(cppToken)
writes([]cppToken)
}
// token4 is produced by translation phase 4.
type token4 struct {
file *tokenFile //TODO sort fields
token3
}
func (t *token4) Position() (r token.Position) {
if t.pos != 0 && t.file != nil {
r = t.file.PositionFor(token.Pos(t.pos), true)
}
return r
}
type hideSet map[StringID]struct{}
type cppToken struct {
token4
hs hideSet
}
func (t *cppToken) has(nm StringID) bool { _, ok := t.hs[nm]; return ok }
type cppWriter struct {
toks []cppToken
}
func (w *cppWriter) write(tok cppToken) { w.toks = append(w.toks, tok) }
func (w *cppWriter) writes(toks []cppToken) { w.toks = append(w.toks, toks...) }
type ungetBuf []cppToken
func (u *ungetBuf) unget(t cppToken) { *u = append(*u, t) }
func (u *ungetBuf) read() (t cppToken) {
s := *u
n := len(s) - 1
t = s[n]
*u = s[:n]
return t
}
func (u *ungetBuf) ungets(toks []cppToken) {
s := *u
for i := len(toks) - 1; i >= 0; i-- {
s = append(s, toks[i])
}
*u = s
}
func cppToksStr(toks []cppToken, sep string) string {
var b strings.Builder
for i, v := range toks {
if i != 0 {
b.WriteString(sep)
}
b.WriteString(v.String())
}
return b.String()
}
type cppReader struct {
buf []cppToken
ungetBuf
}
func (r *cppReader) read() (tok cppToken, ok bool) {
if len(r.ungetBuf) != 0 {
return r.ungetBuf.read(), true
}
if len(r.buf) == 0 {
return tok, false
}
tok = r.buf[0]
r.buf = r.buf[1:]
return tok, true
}
type cppScanner []cppToken
func (s *cppScanner) peek() (r cppToken) {
r.char = -1
if len(*s) == 0 {
return r
}
return (*s)[0]
}
func (s *cppScanner) next() (r cppToken) {
r.char = -1
if len(*s) == 0 {
return r
}
*s = (*s)[1:]
return s.peek()
}
func (s *cppScanner) Pos() token.Pos {
if len(*s) == 0 {
return 0
}
return (*s)[0].Pos()
}
// Macro represents a preprocessor macro definition.
type Macro struct {
fp []StringID
repl []token3
repl2 []Token
name token4
pos int32
isFnLike bool
namedVariadic bool // foo..., note no comma before ellipsis.
variadic bool
}
// Position reports the position of the macro definition.
func (m *Macro) Position() token.Position {
if m.pos != 0 && m.name.file != nil {
return m.name.file.PositionFor(token.Pos(m.pos), true)
}
return token.Position{}
}
// Parameters return the list of function-like macro parameters.
func (m *Macro) Parameters() []StringID { return m.fp }
// ReplacementTokens return the list of tokens m is replaced with. Tokens in
// the returned list have only the Rune and Value fields valid.
func (m *Macro) ReplacementTokens() []Token {
if m.repl2 != nil {
return m.repl2
}
m.repl2 = make([]Token, len(m.repl))
for i, v := range m.repl {
m.repl2[i] = Token{Rune: v.char, Value: v.value, Src: v.src}
}
return m.repl2
}
// IsFnLike reports whether m is a function-like macro.
func (m *Macro) IsFnLike() bool { return m.isFnLike }
func (m *Macro) isNamedVariadicParam(nm StringID) bool {
return m.namedVariadic && nm == m.fp[len(m.fp)-1]
}
func (m *Macro) param2(varArgs []cppToken, ap [][]cppToken, nm StringID, out *[]cppToken, argIndex *int) bool {
*out = nil
if nm == idVaArgs || m.isNamedVariadicParam(nm) {
if !m.variadic {
return false
}
*out = append([]cppToken(nil), varArgs...)
return true
}
for i, v := range m.fp {
if v == nm {
if i < len(ap) {
a := ap[i]
for len(a) != 0 && a[0].char == ' ' {
a = a[1:]
}
*out = a
}
if argIndex != nil {
*argIndex = i
}
return true
}
}
return false
}
func (m *Macro) param(varArgs []cppToken, ap [][]cppToken, nm StringID, out *[]cppToken) bool {
return m.param2(varArgs, ap, nm, out, nil)
}
// --------------------------------------------------------------- Preprocessor
type cpp struct {
counter int
counterMacro Macro
ctx *context
dateMacro Macro
file *tokenFile
fileMacro Macro
in chan []token3
inBuf []token3
includeLevel int
lineMacro Macro
macroStack map[StringID][]*Macro
macros map[StringID]*Macro
out chan *[]token4
outBuf *[]token4
rq chan struct{}
timeMacro Macro
ungetBuf
last rune
intmaxChecked bool
nonFirstRead bool
seenEOF bool
}
func newCPP(ctx *context) *cpp {
b := token4Pool.Get().(*[]token4)
*b = (*b)[:0]
r := &cpp{
ctx: ctx,
macroStack: map[StringID][]*Macro{},
macros: map[StringID]*Macro{},
outBuf: b,
}
r.counterMacro = Macro{repl: []token3{{char: PPNUMBER}}}
r.dateMacro = Macro{repl: []token3{{char: STRINGLITERAL}}}
r.timeMacro = Macro{repl: []token3{{char: STRINGLITERAL}}}
r.fileMacro = Macro{repl: []token3{{char: STRINGLITERAL}}}
r.lineMacro = Macro{repl: []token3{{char: PPNUMBER}}}
r.macros = map[StringID]*Macro{
idCOUNTER: &r.counterMacro,
idDATE: &r.dateMacro,
idFILE: &r.fileMacro,
idLINE: &r.lineMacro,
idTIME: &r.timeMacro,
}
t := time.Now()
// This macro expands to a string constant that describes the date on which the
// preprocessor is being run. The string constant contains eleven characters
// and looks like "Feb 12 1996". If the day of the month is less than 10, it is
// padded with a space on the left.
r.dateMacro.repl[0].value = dict.sid(t.Format("\"Jan _2 2006\""))
// This macro expands to a string constant that describes the time at which the
// preprocessor is being run. The string constant contains eight characters and
// looks like "23:59:01".
r.timeMacro.repl[0].value = dict.sid(t.Format("\"15:04:05\""))
return r
}
func (c *cpp) cppToks(toks []token3) (r []cppToken) {
r = make([]cppToken, len(toks))
for i, v := range toks {
r[i].token4.token3 = v
r[i].token4.file = c.file
}
return r
}
func (c *cpp) err(n node, msg string, args ...interface{}) (stop bool) {
var position token.Position
switch x := n.(type) {
case nil:
case token4:
position = x.Position()
default:
if p := n.Pos(); p.IsValid() {
position = c.file.PositionFor(p, true)
}
}
return c.ctx.err(position, msg, args...)
}
func (c *cpp) read() (cppToken, bool) {
if len(c.ungetBuf) != 0 {
return c.ungetBuf.read(), true
}
if len(c.inBuf) == 0 {
if c.seenEOF {
return cppToken{}, false
}
if c.nonFirstRead {
c.rq <- struct{}{}
}
c.nonFirstRead = true
var ok bool
if c.inBuf, ok = <-c.in; !ok {
c.seenEOF = true
return cppToken{}, false
}
}
tok := c.inBuf[0]
c.inBuf = c.inBuf[1:]
return cppToken{token4{token3: tok, file: c.file}, nil}, true
}
func (c *cpp) write(tok cppToken) {
if tok.char == ' ' && c.last == ' ' {
return
}
if c.ctx.cfg.PreprocessOnly {
switch {
case
//TODO cover ALL the bad combinations
c.last == '+' && tok.char == '+',
c.last == '+' && tok.char == INC,
c.last == '-' && tok.char == '-',
c.last == '-' && tok.char == DEC,
c.last == IDENTIFIER && tok.char == IDENTIFIER,
c.last == PPNUMBER && tok.char == '+', //TODO not when ends in a digit
c.last == PPNUMBER && tok.char == '-': //TODO not when ends in a digit
sp := tok
sp.char = ' '
sp.value = idSpace
*c.outBuf = append(*c.outBuf, sp.token4)
}
}
//dbg("%T.write %q", c, tok)
c.last = tok.char
*c.outBuf = append(*c.outBuf, tok.token4)
if tok.char == '\n' {
for i, tok := range *c.outBuf {
if tok.char != ' ' {
if tok.char == IDENTIFIER && tok.value == idPragmaOp {
toks := (*c.outBuf)[i:]
b := token4Pool.Get().(*[]token4)
*b = (*b)[:0]
c.outBuf = b
c.pragmaOp(toks)
return
}
break
}
}
c.out <- c.outBuf
b := token4Pool.Get().(*[]token4)
*b = (*b)[:0]
c.outBuf = b
}
}
func (c *cpp) pragmaOp(toks []token4) {
var a []string
loop:
for {
tok := toks[0]
toks = toks[1:] // Skip "_Pragma"
toks = ltrim4(toks)
if len(toks) == 0 || toks[0].char != '(' {
c.err(tok, "expected (")
break loop
}
tok = toks[0]
toks = toks[1:] // Skip '('
toks = ltrim4(toks)
if len(toks) == 0 || (toks[0].char != STRINGLITERAL && toks[0].char != LONGSTRINGLITERAL) {
c.err(toks[0], "expected string literal")
break loop
}
tok = toks[0]
a = append(a, tok.String())
toks = toks[1:] // Skip string literal
toks = ltrim4(toks)
if len(toks) == 0 || toks[0].char != ')' {
c.err(toks[0], "expected )")
break loop
}
toks = toks[1:] // Skip ')'
toks = ltrim4(toks)
if len(toks) == 0 {
break loop
}
switch tok := toks[0]; {
case tok.char == '\n':
break loop
case tok.char == IDENTIFIER && tok.value == idPragmaOp:
// ok
default:
c.err(tok, "expected new-line")
break loop
}
}
for i, v := range a {
// [0], 6.10.9, 1
if v[0] == 'L' {
v = v[1:]
}
v = v[1 : len(v)-1]
v = strings.ReplaceAll(v, `\"`, `"`)
a[i] = "#pragma " + strings.ReplaceAll(v, `\\`, `\`) + "\n"
}
src := strings.Join(a, "")
s := newScanner0(c.ctx, strings.NewReader(src), tokenNewFile("", len(src)), 4096)
if ppf := s.translationPhase3(); ppf != nil {
ppf.translationPhase4(c)
}
}
func ltrim4(toks []token4) []token4 {
for len(toks) != 0 && toks[0].char == ' ' {
toks = toks[1:]
}
return toks
}
func (c *cpp) writes(toks []cppToken) {
for _, v := range toks {
c.write(v)
}
}
// [1]pg 1.
//
// expand(TS) /* recur, substitute, pushback, rescan */
// {
// if TS is {} then
// // ---------------------------------------------------------- A
// return {};
//
// else if TS is T^HS • TS and T is in HS then
// //----------------------------------------------------------- B
// return T^HS • expand(TS);
//
// else if TS is T^HS • TS and T is a "()-less macro" then
// // ---------------------------------------------------------- C
// return expand(subst(ts(T), {}, {}, HS \cup {T}, {}) • TS );
//
// else if TS is T^HS •(•TS and T is a "()d macro" then
// // ---------------------------------------------------------- D
// check TS is actuals • )^HS • TS and actuals are "correct for T"
// return expand(subst(ts(T), fp(T), actuals,(HS \cap HS) \cup {T }, {}) • TS);
//
// // ------------------------------------------------------------------ E
// note TS must be T^HS • TS
// return T^HS • expand(TS);
// }
func (c *cpp) expand(ts tokenReader, w tokenWriter, expandDefined bool) {
// dbg("==== expand enter")
start:
tok, ok := ts.read()
tok.file = c.file
// First, if TS is the empty set, the result is the empty set.
if !ok {
// ---------------------------------------------------------- A
// return {};
// dbg("---- expand A")
return
}
// dbg("expand start %q", tok)
if tok.char == IDENTIFIER {
nm := tok.value
if nm == idDefined && expandDefined {
c.parseDefined(tok, ts, w)
goto start
}
// Otherwise, if the token sequence begins with a token whose
// hide set contains that token, then the result is the token
// sequence beginning with that token (including its hide set)
// followed by the result of expand on the rest of the token
// sequence.
if tok.has(nm) {
// -------------------------------------------------- B
// return T^HS • expand(TS);
// dbg("---- expand B")
// dbg("expand write %q", tok)
w.write(tok)
goto start
}
m := c.macros[nm]
if m != nil && !m.isFnLike {
// Otherwise, if the token sequence begins with an
// object-like macro, the result is the expansion of
// the rest of the token sequence beginning with the
// sequence returned by subst invoked with the
// replacement token sequence for the macro, two empty
// sets, the union of the macros hide set and the
// macro itself, and an empty set.
switch nm {
case idLINE:
c.lineMacro.repl[0].value = dict.sid(fmt.Sprint(tok.Position().Line))
case idCOUNTER:
c.counterMacro.repl[0].value = dict.sid(fmt.Sprint(c.counter))
c.counter++
case idTclDefaultDoubleRounding:
if c.ctx.cfg.ReplaceMacroTclDefaultDoubleRounding != "" {
m = c.macros[dict.sid(c.ctx.cfg.ReplaceMacroTclDefaultDoubleRounding)]
}
case idTclIeeeDoubleRounding:
if c.ctx.cfg.ReplaceMacroTclIeeeDoubleRounding != "" {
m = c.macros[dict.sid(c.ctx.cfg.ReplaceMacroTclIeeeDoubleRounding)]
}
}
if m != nil {
// -------------------------------------------------- C
// return expand(subst(ts(T), {}, {}, HS \cup {T}, {}) • TS );
// dbg("---- expand C")
hs := hideSet{nm: {}}
for k, v := range tok.hs {
hs[k] = v
}
os := cppTokensPool.Get().(*[]cppToken)
toks := c.subst(m, c.cppToks(m.repl), nil, nil, nil, hs, os, expandDefined)
for i := range toks {
toks[i].pos = tok.pos
}
if len(toks) == 1 {
toks[0].macro = nm
}
ts.ungets(toks)
(*os) = (*os)[:0]
cppTokensPool.Put(os)
goto start
}
}
if m != nil && m.isFnLike {
switch nm {
case idFdZero:
if c.ctx.cfg.ReplaceMacroFdZero != "" {
m = c.macros[dict.sid(c.ctx.cfg.ReplaceMacroFdZero)]
}
}
if m != nil {
// -------------------------------------------------- D
// check TS is actuals • )^HS • TS and actuals are "correct for T"
// return expand(subst(ts(T), fp(T), actuals,(HS \cap HS) \cup {T }, {}) • TS);
// dbg("---- expand D")
hs := tok.hs
var skip []cppToken
again:
t2, ok := ts.read()
if !ok {
// dbg("expand write %q", tok)
w.write(tok)
ts.ungets(skip)
goto start
}
skip = append(skip, t2)
switch t2.char {
case '\n', ' ':
goto again
case '(':
// ok
default:
w.write(tok)
ts.ungets(skip)
goto start
}
varArgs, ap, hs2 := c.actuals(m, ts)
if nm == idHasIncludeImpl { //TODO-
if len(ap) != 1 || len(ap[0]) != 1 {
panic(todo("internal error"))
}
arg := ap[0][0].value.String()
switch {
case strings.HasPrefix(arg, `"\"`): // `"\"stdio.h\""`
arg = arg[2:len(arg)-3] + `"` // -> `"stdio.h"`
case strings.HasPrefix(arg, `"<`): // `"<stdio.h>"`
arg = arg[1 : len(arg)-1] // -> `<stdio.h>`
default:
arg = ""
}
var tok3 token3
tok3.char = PPNUMBER
tok3.value = idZero
if arg != "" {
if _, err := c.hasInclude(&tok, arg); err == nil {
tok3.value = idOne
}
}
tok := cppToken{token4{token3: tok3, file: c.file}, nil}
ts.ungets([]cppToken{tok})
goto start
}
switch {
case len(hs2) == 0:
hs2 = hideSet{nm: {}}
default:
nhs := hideSet{}
for k := range hs {
if _, ok := hs2[k]; ok {
nhs[k] = struct{}{}
}
}
nhs[nm] = struct{}{}
hs2 = nhs
}
os := cppTokensPool.Get().(*[]cppToken)
toks := c.subst(m, c.cppToks(m.repl), m.fp, varArgs, ap, hs2, os, expandDefined)
for i := range toks {
toks[i].pos = tok.pos
}
ts.ungets(toks)
(*os) = (*os)[:0]
cppTokensPool.Put(os)
goto start
}
}
}
// ------------------------------------------------------------------ E
// note TS must be T^HS • TS
// return T^HS • expand(TS);
// dbg("---- expand E")
// dbg("expand write %q", tok)
w.write(tok)
goto start
}
func (c *cpp) hasInclude(n Node, nm string) (rs string, err error) {
// nm0 := nm
// defer func() { //TODO-
// trc("nm0 %q nm %q rs %q err %v", nm0, nm, rs, err)
// }()
var (
b byte
paths []string
sys bool
)
switch {
case nm != "" && nm[0] == '"':
paths = c.ctx.includePaths
b = '"'
case nm != "" && nm[0] == '<':
paths = c.ctx.sysIncludePaths
sys = true
b = '>'
case nm == "":
return "", fmt.Errorf("%v: invalid empty include argument", n.Position())
default:
return "", fmt.Errorf("%v: invalid include argument %s", n.Position(), nm)
}
x := strings.IndexByte(nm[1:], b)
if x < 0 {
return "", fmt.Errorf("%v: invalid include argument %s", n.Position(), nm)
}
nm = filepath.FromSlash(nm[1 : x+1])
switch {
case filepath.IsAbs(nm):
fi, err := c.ctx.statFile(nm, sys)
if err != nil {
return "", fmt.Errorf("%v: %s", n.Position(), err)
}
if fi.IsDir() {
return "", fmt.Errorf("%v: %s is a directory, not a file", n.Position(), nm)
}
return nm, nil
default:
dir := filepath.Dir(c.file.Name())
for _, v := range paths {
if v == "@" {
v = dir
}
var p string
switch {
case strings.HasPrefix(nm, "./"):
wd := c.ctx.cfg.WorkingDir
if wd == "" {
var err error
if wd, err = os.Getwd(); err != nil {
return "", fmt.Errorf("%v: cannot determine working dir: %v", n.Position(), err)
}
}
p = filepath.Join(wd, nm)
default:
p = filepath.Join(v, nm)
}
fi, err := c.ctx.statFile(p, sys)
if err != nil || fi.IsDir() {
continue
}
return p, nil
}
wd, _ := os.Getwd()
return "", fmt.Errorf("include file not found: %s (wd %s)\nsearch paths:\n\t%s", nm, wd, strings.Join(paths, "\n\t"))
}
}
func (c *cpp) actuals(m *Macro, r tokenReader) (varArgs []cppToken, ap [][]cppToken, hs hideSet) {
var lvl, n int
varx := len(m.fp)
if m.namedVariadic {
varx--
}
var last rune
for {
t, ok := r.read()
if !ok {
c.err(t, "unexpected EOF")
return nil, nil, nil
}
// 6.10.3, 10
//
// Within the sequence of preprocessing tokens making up an
// invocation of a function-like macro, new-line is considered
// a normal white-space character.
if t.char == '\n' {
t.char = ' '
t.value = idSpace
}
if t.char == ' ' && last == ' ' {
continue
}
last = t.char
switch t.char {
case ',':
if lvl == 0 {
if n >= varx && (len(varArgs) != 0 || !isWhite(t.char)) {
varArgs = append(varArgs, t)
}
n++
continue
}
case ')':
if lvl == 0 {
for len(ap) < len(m.fp) {
ap = append(ap, nil)
}
for i, v := range ap {
ap[i] = c.trim(v)
}
// for i, v := range ap {
// dbg("%T.actuals %v/%v %q", c, i, len(ap), tokStr(v, "|"))
// }
return c.trim(varArgs), ap, t.hs
}
lvl--
case '(':
lvl++
}
if n >= varx && (len(varArgs) != 0 || !isWhite(t.char)) {
varArgs = append(varArgs, t)
}
for len(ap) <= n {
ap = append(ap, []cppToken{})
}
ap[n] = append(ap[n], t)
}
}
// [1]pg 2.
//
// subst(IS, FP, AP, HS, OS) /* substitute args, handle stringize and paste */
// {
// if IS is {} then
// // ---------------------------------------------------------- A
// return hsadd(HS, OS);
//
// else if IS is # • T • IS and T is FP[i] then
// // ---------------------------------------------------------- B
// return subst(IS, FP, AP, HS, OS • stringize(select(i, AP)));
//
// else if IS is ## • T • IS and T is FP[i] then
// {
// // ---------------------------------------------------------- C
// if select(i, AP) is {} then /* only if actuals can be empty */
// // -------------------------------------------------- D
// return subst(IS, FP, AP, HS, OS);
// else
// // -------------------------------------------------- E
// return subst(IS, FP, AP, HS, glue(OS, select(i, AP)));
// }
//
// else if IS is ## • T^HS • IS then
// // ---------------------------------------------------------- F
// return subst(IS, FP, AP, HS, glue(OS, T^HS));
//
// else if IS is T • ##^HS • IS and T is FP[i] then
// {
// // ---------------------------------------------------------- G
// if select(i, AP) is {} then /* only if actuals can be empty */
// {
// // -------------------------------------------------- H
// if IS is T • IS and T is FP[j] then
// // ------------------------------------------ I
// return subst(IS, FP, AP, HS, OS • select(j, AP));
// else
// // ------------------------------------------ J
// return subst(IS, FP, AP, HS, OS);
// }
// else
// // -------------------------------------------------- K
// return subst(##^HS • IS, FP, AP, HS, OS • select(i, AP));
//
// }
//
// else if IS is T • IS and T is FP[i] then
// // ---------------------------------------------------------- L
// return subst(IS, FP, AP, HS, OS • expand(select(i, AP)));
//
// // ------------------------------------------------------------------ M
// note IS must be T^HS • IS
// return subst(IS, FP, AP, HS, OS • T^HS);
// }
//
// A quick overview of subst is that it walks through the input sequence, IS,
// building up an output sequence, OS, by handling each token from left to
// right. (The order that this operation takes is left to the implementation
// also, walking from left to right is more natural since the rest of the
// algorithm is constrained to this ordering.) Stringizing is easy, pasting
// requires trickier handling because the operation has a bunch of
// combinations. After the entire input sequence is finished, the updated hide
// set is applied to the output sequence, and that is the result of subst.
func (c *cpp) subst(m *Macro, is []cppToken, fp []StringID, varArgs []cppToken, ap [][]cppToken, hs hideSet, os *[]cppToken, expandDefined bool) (r []cppToken) {
// var a []string
// for _, v := range ap {
// a = append(a, fmt.Sprintf("%q", cppToksStr(v, "|")))
// }
// dbg("==== subst: is %q, fp %v ap %v", cppToksStr(is, "|"), fp, a)
start:
// dbg("start: %q", cppToksStr(is, "|"))
if len(is) == 0 {
// ---------------------------------------------------------- A
// return hsadd(HS, OS);
// dbg("---- A")
// dbg("subst returns %q", cppToksStr(os, "|"))
return c.hsAdd(hs, os)
}
tok := is[0]
var arg []cppToken
if tok.char == '#' {
if len(is) > 1 && is[1].char == IDENTIFIER && m.param(varArgs, ap, is[1].value, &arg) {
// -------------------------------------------------- B
// return subst(IS, FP, AP, HS, OS • stringize(select(i, AP)));
// dbg("---- subst B")
*os = append(*os, c.stringize(arg))
is = is[2:]
goto start
}
}
if tok.char == PPPASTE {
if len(is) > 1 && is[1].char == IDENTIFIER && m.param(varArgs, ap, is[1].value, &arg) {
// -------------------------------------------------- C
// dbg("---- subst C")
if len(arg) == 0 {
// TODO "only if actuals can be empty"
// ------------------------------------------ D
// return subst(IS, FP, AP, HS, OS);
// dbg("---- D")
if c := len(*os); c != 0 && (*os)[c-1].char == ',' {
*os = (*os)[:c-1]
}
is = is[2:]
goto start
}
// -------------------------------------------------- E
// return subst(IS, FP, AP, HS, glue(OS, select(i, AP)));
// dbg("---- subst E")
*os = c.glue(*os, arg)
is = is[2:]
goto start
}
if len(is) > 1 {
// -------------------------------------------------- F
// return subst(IS, FP, AP, HS, glue(OS, T^HS));
// dbg("---- subst F")
*os = c.glue(*os, is[1:2])
is = is[2:]
goto start
}
}
if tok.char == IDENTIFIER && (len(is) > 1 && is[1].char == PPPASTE) && m.param(varArgs, ap, tok.value, &arg) {
// ---------------------------------------------------------- G
// dbg("---- subst G")
if len(arg) == 0 {
// TODO "only if actuals can be empty"
// -------------------------------------------------- H
// dbg("---- subst H")
is = is[2:] // skip T##
if len(is) > 0 && is[0].char == IDENTIFIER && m.param(varArgs, ap, is[0].value, &arg) {
// -------------------------------------------------- I
// return subst(IS, FP, AP, HS, OS • select(j, AP));
// dbg("---- subst I")
*os = append(*os, arg...)
is = is[1:]
goto start
} else {
// -------------------------------------------------- J
// return subst(IS, FP, AP, HS, OS);
// dbg("---- subst J")
goto start
}
}
// ---------------------------------------------------------- K
// return subst(##^HS • IS, FP, AP, HS, OS • select(i, AP));
// dbg("---- subst K")
*os = append(*os, arg...)
is = is[1:]
goto start
}
ax := -1
if tok.char == IDENTIFIER && m.param2(varArgs, ap, tok.value, &arg, &ax) {
// ------------------------------------------ L
// return subst(IS, FP, AP, HS, OS • expand(select(i, AP)));
// dbg("---- subst L")
// if toks, ok := cache[tok.value]; ok {
// os = append(os, toks...)
// is = is[1:]
// goto start
// }
sel := cppReader{buf: arg}
var w cppWriter
c.expand(&sel, &w, expandDefined)
*os = append(*os, w.toks...)
if ax >= 0 {
ap[ax] = w.toks
}
is = is[1:]
goto start
}
// ------------------------------------------------------------------ M
// note IS must be T^HS • IS
// return subst(IS, FP, AP, HS, OS • T^HS);
// dbg("---- subst M")
*os = append(*os, tok)
is = is[1:]
goto start
}
// paste last of left side with first of right side
//
// [1] pg. 3
//
//TODO implement properly [0], 6.10.3.3, 2. Must rescan the resulting token(s).
//
// $ cat main.c
// #include <stdio.h>
//
// #define foo(a, b) a ## b
//
// int main() {
// int i = 42;
// i foo(+, +);
// printf("%i\n", i);
// return 0;
// }
// $ rm -f a.out ; gcc -Wall main.c && ./a.out ; echo $?
// 43
// 0
// $
func (c *cpp) glue(ls, rs []cppToken) (out []cppToken) {
if len(rs) == 0 {
return ls
}
if len(ls) == 0 {
return rs
}
l := ls[len(ls)-1]
ls = ls[:len(ls)-1]
r := rs[0]
rs = rs[1:]
if l.char == IDENTIFIER && l.value == idL && r.char == STRINGLITERAL {
l.char = LONGSTRINGLITERAL
}
l.value = dict.sid(l.String() + r.String())
return append(append(ls, l), rs...)
}
// Given a token sequence, stringize returns a single string literal token
// containing the concatenated spellings of the tokens.
//
// [1] pg. 3
func (c *cpp) stringize(s0 []cppToken) (r cppToken) {
// 6.10.3.2
//
// Each occurrence of white space between the arguments preprocessing
// tokens becomes a single space character in the character string
// literal.
s := make([]cppToken, 0, len(s0))
var last rune
for i := range s0 {
t := s0[i]
if isWhite(t.char) {
t.char = ' '
t.value = idSpace
if last == ' ' {
continue
}
}
last = t.char
s = append(s, t)
}
// White space before the first preprocessing token and after the last
// preprocessing token composing the argument is deleted.
s = c.trim(s)
// The character string literal corresponding to an empty argument is
// ""
if len(s) == 0 {
r.hs = nil
r.char = STRINGLITERAL
r.value = idEmptyString
return r
}
var a []string
// Otherwise, the original spelling of each preprocessing token in the
// argument is retained in the character string literal, except for
// special handling for producing the spelling of string literals and
// character constants: a \ character is inserted before each " and \
// character of a character constant or string literal (including the
// delimiting " characters), except that it is implementation-defined
// whether a \ character is inserted before the \ character beginning a
// universal character name.
for _, v := range s {
s := v.String()
switch v.char {
case CHARCONST, STRINGLITERAL:
s = strings.ReplaceAll(s, `\`, `\\`)
s = strings.ReplaceAll(s, `"`, `\"`)
case LONGCHARCONST, LONGSTRINGLITERAL:
panic("TODO")
}
a = append(a, s)
}
r = s[0]
r.hs = nil
r.char = STRINGLITERAL
r.value = dict.sid(`"` + strings.Join(a, "") + `"`)
return r
}
func (c *cpp) trim(toks []cppToken) []cppToken {
for len(toks) != 0 && isWhite(toks[0].char) {
toks = toks[1:]
}
for len(toks) != 0 && isWhite(toks[len(toks)-1].char) {
toks = toks[:len(toks)-1]
}
return toks
}
func (c *cpp) hsAdd(hs hideSet, toks *[]cppToken) []cppToken {
for i, v := range *toks {
if v.hs == nil {
v.hs = hideSet{}
}
for k, w := range hs {
v.hs[k] = w
}
v.file = c.file
(*toks)[i] = v
}
return *toks
}
func (c *cpp) parseDefined(tok cppToken, r tokenReader, w tokenWriter) {
toks := []cppToken{tok}
if tok = c.scanToNonBlankToken(&toks, r, w); tok.char < 0 {
return
}
switch tok.char {
case IDENTIFIER:
// ok
case '(':
if tok = c.scanToNonBlankToken(&toks, r, w); tok.char < 0 {
return
}
if tok.char != IDENTIFIER {
w.writes(toks)
return
}
tok2 := c.scanToNonBlankToken(&toks, r, w)
if tok2.char < 0 {
return
}
if tok2.char != ')' {
w.writes(toks)
return
}
}
tok.char = PPNUMBER
switch _, ok := c.macros[tok.value]; {
case ok:
tok.value = idOne
default:
tok.value = idZero
}
w.write(tok)
}
func (c *cpp) scanToNonBlankToken(toks *[]cppToken, r tokenReader, w tokenWriter) cppToken {
tok, ok := r.read()
if !ok {
w.writes(*toks)
tok.char = -1
return tok
}
*toks = append(*toks, tok)
if tok.char == ' ' || tok.char == '\n' {
if tok, ok = r.read(); !ok {
w.writes(*toks)
tok.char = -1
return tok
}
*toks = append(*toks, tok)
}
return (*toks)[len(*toks)-1]
}
// [0], 6.10.1
func (c *cpp) evalInclusionCondition(expr []token3) (r bool) {
if !c.intmaxChecked {
if m := c.macros[idIntMaxWidth]; m != nil && len(m.repl) != 0 {
if val := c.intMaxWidth(); val != 0 && val != 64 {
c.err(m.name, "%s is %v, but only 64 is supported", idIntMaxWidth, val)
}
}
c.intmaxChecked = true
}
val := c.eval(expr)
return val != nil && c.isNonZero(val)
}
func (c *cpp) intMaxWidth() int64 {
if m := c.macros[idIntMaxWidth]; m != nil && len(m.repl) != 0 {
switch x := c.eval(m.repl).(type) {
case nil:
return 0
case int64:
return x
case uint64:
return int64(x)
default:
panic(internalError())
}
}
return 0
}
func (c *cpp) eval(expr []token3) interface{} {
toks := make([]cppToken, len(expr))
for i, v := range expr {
toks[i] = cppToken{token4{token3: v}, nil}
}
var w cppWriter
c.expand(&cppReader{buf: toks}, &w, true)
toks = w.toks
p := 0
for _, v := range toks {
switch v.char {
case ' ', '\n':
// nop
default:
toks[p] = v
p++
}
}
toks = toks[:p]
s := cppScanner(toks)
val := c.expression(&s, true)
switch s.peek().char {
case -1, '#':
// ok
default:
t := s.peek()
c.err(t, "unexpected %s", tokName(t.char))
return nil
}
return val
}
// [0], 6.5.17 Comma operator
//
// expression:
// assignment-expression
// expression , assignment-expression
func (c *cpp) expression(s *cppScanner, eval bool) interface{} {
for {
r := c.assignmentExpression(s, eval)
if s.peek().char != ',' {
return r
}
s.next()
}
}
// [0], 6.5.16 Assignment operators
//
// assignment-expression:
// conditional-expression
// unary-expression assignment-operator assignment-expression
//
// assignment-operator: one of
// = *= /= %= += -= <<= >>= &= ^= |=
func (c *cpp) assignmentExpression(s *cppScanner, eval bool) interface{} {
return c.conditionalExpression(s, eval)
}
// [0], 6.5.15 Conditional operator
//
// conditional-expression:
// logical-OR-expression
// logical-OR-expression ? expression : conditional-expression
func (c *cpp) conditionalExpression(s *cppScanner, eval bool) interface{} {
expr := c.logicalOrExpression(s, eval)
if s.peek().char == '?' {
s.next()
exprIsNonZero := c.isNonZero(expr)
expr2 := c.conditionalExpression(s, exprIsNonZero)
if tok := s.peek(); tok.char != ':' {
c.err(tok, "expected ':'")
return expr
}
s.next()
expr3 := c.conditionalExpression(s, !exprIsNonZero)
// [0] 6.5.15
//
// 5. If both the second and third operands have arithmetic type, the result
// type that would be determined by the usual arithmetic conversions, were they
// applied to those two operands, is the type of the result.
x := c.operand(expr2)
y := c.operand(expr3)
if x != nil && y != nil {
x, y = usualArithmeticConversions(c.ctx, nil, x, y, false)
expr2 = c.fromOperand(x)
expr3 = c.fromOperand(y)
}
switch {
case exprIsNonZero:
expr = expr2
default:
expr = expr3
}
}
return expr
}
func (c *cpp) operand(v interface{}) Operand {
switch x := v.(type) {
case int64:
return &operand{typ: &typeBase{size: 8, kind: byte(LongLong), flags: fSigned}, value: Int64Value(x)}
case uint64:
return &operand{typ: &typeBase{size: 8, kind: byte(ULongLong)}, value: Uint64Value(x)}
default:
return nil
}
}
func (c *cpp) fromOperand(op Operand) interface{} {
switch x := op.Value().(type) {
case Int64Value:
return int64(x)
case Uint64Value:
return uint64(x)
default:
return nil
}
}
// [0], 6.5.14 Logical OR operator
//
// logical-OR-expression:
// logical-AND-expression
// logical-OR-expression || logical-AND-expression
func (c *cpp) logicalOrExpression(s *cppScanner, eval bool) interface{} {
lhs := c.logicalAndExpression(s, eval)
for s.peek().char == OROR {
s.next()
if c.isNonZero(lhs) {
eval = false
}
rhs := c.logicalAndExpression(s, eval)
if c.isNonZero(lhs) || c.isNonZero(rhs) {
lhs = int64(1)
}
}
return lhs
}
// [0], 6.5.13 Logical AND operator
//
// logical-AND-expression:
// inclusive-OR-expression
// logical-AND-expression && inclusive-OR-expression
func (c *cpp) logicalAndExpression(s *cppScanner, eval bool) interface{} {
lhs := c.inclusiveOrExpression(s, eval)
for s.peek().char == ANDAND {
s.next()
if c.isZero(lhs) {
eval = false
}
rhs := c.inclusiveOrExpression(s, eval)
if c.isZero(lhs) || c.isZero(rhs) {
lhs = int64(0)
}
}
return lhs
}
func (c *cpp) isZero(val interface{}) bool {
switch x := val.(type) {
case int64:
return x == 0
case uint64:
return x == 0
}
panic(internalError())
}
// [0], 6.5.12 Bitwise inclusive OR operator
//
// inclusive-OR-expression:
// exclusive-OR-expression
// inclusive-OR-expression | exclusive-OR-expression
func (c *cpp) inclusiveOrExpression(s *cppScanner, eval bool) interface{} {
lhs := c.exclusiveOrExpression(s, eval)
for s.peek().char == '|' {
s.next()
rhs := c.exclusiveOrExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
lhs = x | y
case uint64:
lhs = uint64(x) | y
}
case uint64:
switch y := rhs.(type) {
case int64:
lhs = x | uint64(y)
case uint64:
lhs = x | y
}
}
}
}
return lhs
}
// [0], 6.5.11 Bitwise exclusive OR operator
//
// exclusive-OR-expression:
// AND-expression
// exclusive-OR-expression ^ AND-expression
func (c *cpp) exclusiveOrExpression(s *cppScanner, eval bool) interface{} {
lhs := c.andExpression(s, eval)
for s.peek().char == '^' {
s.next()
rhs := c.andExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
lhs = x ^ y
case uint64:
lhs = uint64(x) ^ y
}
case uint64:
switch y := rhs.(type) {
case int64:
lhs = x ^ uint64(y)
case uint64:
lhs = x ^ y
}
}
}
}
return lhs
}
// [0], 6.5.10 Bitwise AND operator
//
// AND-expression:
// equality-expression
// AND-expression & equality-expression
func (c *cpp) andExpression(s *cppScanner, eval bool) interface{} {
lhs := c.equalityExpression(s, eval)
for s.peek().char == '&' {
s.next()
rhs := c.equalityExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
lhs = x & y
case uint64:
lhs = uint64(x) & y
}
case uint64:
switch y := rhs.(type) {
case int64:
lhs = x & uint64(y)
case uint64:
lhs = x & y
}
}
}
}
return lhs
}
// [0], 6.5.9 Equality operators
//
// equality-expression:
// relational-expression
// equality-expression == relational-expression
// equality-expression != relational-expression
func (c *cpp) equalityExpression(s *cppScanner, eval bool) interface{} {
lhs := c.relationalExpression(s, eval)
for {
var v bool
switch s.peek().char {
case EQ:
s.next()
rhs := c.relationalExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
v = x == y
case uint64:
v = uint64(x) == y
}
case uint64:
switch y := rhs.(type) {
case int64:
v = x == uint64(y)
case uint64:
v = x == y
}
}
}
case NEQ:
s.next()
rhs := c.relationalExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
v = x != y
case uint64:
v = uint64(x) != y
}
case uint64:
switch y := rhs.(type) {
case int64:
v = x != uint64(y)
case uint64:
v = x != y
}
}
}
default:
return lhs
}
switch {
case v:
lhs = int64(1)
default:
lhs = int64(0)
}
}
}
// [0], 6.5.8 Relational operators
//
// relational-expression:
// shift-expression
// relational-expression < shift-expression
// relational-expression > shift-expression
// relational-expression <= shift-expression
// relational-expression >= shift-expression
func (c *cpp) relationalExpression(s *cppScanner, eval bool) interface{} {
lhs := c.shiftExpression(s, eval)
for {
var v bool
switch s.peek().char {
case '<':
s.next()
rhs := c.shiftExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
v = x < y
case uint64:
v = uint64(x) < y
}
case uint64:
switch y := rhs.(type) {
case int64:
v = x < uint64(y)
case uint64:
v = x < y
}
}
}
case '>':
s.next()
rhs := c.shiftExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
v = x > y
case uint64:
v = uint64(x) > y
}
case uint64:
switch y := rhs.(type) {
case int64:
v = x > uint64(y)
case uint64:
v = x > y
}
}
}
case LEQ:
s.next()
rhs := c.shiftExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
v = x <= y
case uint64:
v = uint64(x) <= y
}
case uint64:
switch y := rhs.(type) {
case int64:
v = x <= uint64(y)
case uint64:
v = x <= y
}
}
}
case GEQ:
s.next()
rhs := c.shiftExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
v = x >= y
case uint64:
v = uint64(x) >= y
}
case uint64:
switch y := rhs.(type) {
case int64:
v = x >= uint64(y)
case uint64:
v = x >= y
}
}
}
default:
return lhs
}
switch {
case v:
lhs = int64(1)
default:
lhs = int64(0)
}
}
}
// [0], 6.5.7 Bitwise shift operators
//
// shift-expression:
// additive-expression
// shift-expression << additive-expression
// shift-expression >> additive-expression
func (c *cpp) shiftExpression(s *cppScanner, eval bool) interface{} {
lhs := c.additiveExpression(s, eval)
for {
switch s.peek().char {
case LSH:
s.next()
rhs := c.additiveExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
lhs = x << uint(y)
case uint64:
lhs = uint64(x) << uint(y)
}
case uint64:
switch y := rhs.(type) {
case int64:
lhs = x << uint(y)
case uint64:
lhs = x << uint(y)
}
}
}
case RSH:
s.next()
rhs := c.additiveExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
lhs = x >> uint(y)
case uint64:
lhs = uint64(x) >> uint(y)
}
case uint64:
switch y := rhs.(type) {
case int64:
lhs = x >> uint(y)
case uint64:
lhs = x >> uint(y)
}
}
}
default:
return lhs
}
}
}
// [0], 6.5.6 Additive operators
//
// additive-expression:
// multiplicative-expression
// additive-expression + multiplicative-expression
// additive-expression - multiplicative-expression
func (c *cpp) additiveExpression(s *cppScanner, eval bool) interface{} {
lhs := c.multiplicativeExpression(s, eval)
for {
switch s.peek().char {
case '+':
s.next()
rhs := c.multiplicativeExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
lhs = x + y
case uint64:
lhs = uint64(x) + y
}
case uint64:
switch y := rhs.(type) {
case int64:
lhs = x + uint64(y)
case uint64:
lhs = x + y
}
}
}
case '-':
s.next()
rhs := c.multiplicativeExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
lhs = x - y
case uint64:
lhs = uint64(x) - y
}
case uint64:
switch y := rhs.(type) {
case int64:
lhs = x - uint64(y)
case uint64:
lhs = x - y
}
}
}
default:
return lhs
}
}
}
// [0], 6.5.5 Multiplicative operators
//
// multiplicative-expression:
// unary-expression // [0], 6.10.1, 1.
// multiplicative-expression * unary-expression
// multiplicative-expression / unary-expression
// multiplicative-expression % unary-expression
func (c *cpp) multiplicativeExpression(s *cppScanner, eval bool) interface{} {
lhs := c.unaryExpression(s, eval)
for {
switch s.peek().char {
case '*':
s.next()
rhs := c.unaryExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
lhs = x * y
case uint64:
lhs = uint64(x) * y
}
case uint64:
switch y := rhs.(type) {
case int64:
lhs = x * uint64(y)
case uint64:
lhs = x * y
}
}
}
case '/':
tok := s.next()
rhs := c.unaryExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
if y == 0 {
c.err(tok, "division by zero")
break
}
lhs = x / y
case uint64:
if y == 0 {
c.err(tok, "division by zero")
break
}
lhs = uint64(x) / y
}
case uint64:
switch y := rhs.(type) {
case int64:
if y == 0 {
c.err(tok, "division by zero")
break
}
lhs = x / uint64(y)
case uint64:
if y == 0 {
c.err(tok, "division by zero")
break
}
lhs = x / y
}
}
}
case '%':
tok := s.next()
rhs := c.unaryExpression(s, eval)
if eval {
switch x := lhs.(type) {
case int64:
switch y := rhs.(type) {
case int64:
if y == 0 {
c.err(tok, "division by zero")
break
}
lhs = x % y
case uint64:
if y == 0 {
c.err(tok, "division by zero")
break
}
lhs = uint64(x) % y
}
case uint64:
switch y := rhs.(type) {
case int64:
if y == 0 {
c.err(tok, "division by zero")
break
}
lhs = x % uint64(y)
case uint64:
if y == 0 {
c.err(tok, "division by zero")
break
}
lhs = x % y
}
}
}
default:
return lhs
}
}
}
// [0], 6.5.3 Unary operators
//
// unary-expression:
// primary-expression
// unary-operator unary-expression
//
// unary-operator: one of
// + - ~ !
func (c *cpp) unaryExpression(s *cppScanner, eval bool) interface{} {
switch s.peek().char {
case '+':
s.next()
return c.unaryExpression(s, eval)
case '-':
s.next()
expr := c.unaryExpression(s, eval)
if eval {
switch x := expr.(type) {
case int64:
expr = -x
case uint64:
expr = -x
}
}
return expr
case '~':
s.next()
expr := c.unaryExpression(s, eval)
if eval {
switch x := expr.(type) {
case int64:
expr = ^x
case uint64:
expr = ^x
}
}
return expr
case '!':
s.next()
expr := c.unaryExpression(s, eval)
if eval {
var v bool
switch x := expr.(type) {
case int64:
v = x == 0
case uint64:
v = x == 0
}
switch {
case v:
expr = int64(1)
default:
expr = int64(0)
}
}
return expr
default:
return c.primaryExpression(s, eval)
}
}
// [0], 6.5.1 Primary expressions
//
// primary-expression:
// identifier
// constant
// ( expression )
func (c *cpp) primaryExpression(s *cppScanner, eval bool) interface{} {
switch tok := s.peek(); tok.char {
case CHARCONST, LONGCHARCONST:
s.next()
r := charConst(c.ctx, tok)
return int64(r)
case IDENTIFIER:
if c.ctx.evalIdentError {
panic("cannot evaluate identifier")
}
s.next()
if s.peek().char == '(' {
s.next()
n := 1
loop:
for n != 0 {
switch s.peek().char {
case '(':
n++
case ')':
n--
case -1:
c.err(s.peek(), "expected )")
break loop
}
s.next()
}
}
return int64(0)
case PPNUMBER:
s.next()
return c.intConst(tok)
case '(':
s.next()
expr := c.expression(s, eval)
if s.peek().char == ')' {
s.next()
}
return expr
default:
return int64(0)
}
}
// [0], 6.4.4.1 Integer constants
//
// integer-constant:
// decimal-constant integer-suffix_opt
// octal-constant integer-suffix_opt
// hexadecimal-constant integer-suffix_opt
//
// decimal-constant:
// nonzero-digit
// decimal-constant digit
//
// octal-constant:
// 0
// octal-constant octal-digit
//
// hexadecimal-prefix: one of
// 0x 0X
//
// integer-suffix_opt: one of
// u ul ull l lu ll llu
func (c *cpp) intConst(tok cppToken) (r interface{}) {
var n uint64
s0 := tok.String()
s := strings.TrimRight(s0, "uUlL")
switch {
case strings.HasPrefix(s, "0x") || strings.HasPrefix(s, "0X"):
var err error
if n, err = strconv.ParseUint(s[2:], 16, 64); err != nil {
c.err(tok, "%v", err)
return int64(0)
}
case strings.HasPrefix(s, "0"):
var err error
if n, err = strconv.ParseUint(s, 8, 64); err != nil {
c.err(tok, "%v", err)
return int64(0)
}
default:
var err error
if n, err = strconv.ParseUint(s, 10, 64); err != nil {
c.err(tok, "%v", err)
return int64(0)
}
}
suffix := s0[len(s):]
if suffix == "" {
if n > math.MaxInt64 {
return n
}
return int64(n)
}
switch suffix = strings.ToLower(suffix); suffix {
default:
c.err(tok, "invalid suffix: %v", s0)
fallthrough
case
"l",
"ll":
if n > math.MaxInt64 {
return n
}
return int64(n)
case
"llu",
"lu",
"u",
"ul",
"ull":
return n
}
}
func charConst(ctx *context, tok cppToken) rune {
s := tok.String()
switch tok.char {
case LONGCHARCONST:
s = s[1:] // Remove leading 'L'.
fallthrough
case CHARCONST:
s = s[1 : len(s)-1] // Remove outer 's.
if len(s) == 1 {
return rune(s[0])
}
var r rune
var n int
switch s[0] {
case '\\':
r, n = decodeEscapeSequence(ctx, tok, s)
if r < 0 {
r = -r
}
default:
r, n = utf8.DecodeRuneInString(s)
}
if n != len(s) {
ctx.errNode(&tok, "invalid character constant")
}
return r
}
panic(internalError())
}
// escape-sequence {simple-sequence}|{octal-escape-sequence}|{hexadecimal-escape-sequence}|{universal-character-name}
// simple-sequence \\['\x22?\\abfnrtv]
// octal-escape-sequence \\{octal-digit}{octal-digit}?{octal-digit}?
// hexadecimal-escape-sequence \\x{hexadecimal-digit}+
func decodeEscapeSequence(ctx *context, tok cppToken, s string) (rune, int) {
if s[0] != '\\' {
panic(internalError())
}
if len(s) == 1 {
return rune(s[0]), 1
}
r := rune(s[1])
switch r {
case '\'', '"', '?', '\\':
return r, 2
case 'a':
return 7, 2
case 'b':
return 8, 2
case 'e':
return 0x1b, 2
case 'f':
return 12, 2
case 'n':
return 10, 2
case 'r':
return 13, 2
case 't':
return 9, 2
case 'v':
return 11, 2
case 'x':
v, n := 0, 2
loop2:
for i := 2; i < len(s); i++ {
r := s[i]
switch {
case r >= '0' && r <= '9', r >= 'a' && r <= 'f', r >= 'A' && r <= 'F':
v = v<<4 | decodeHex(r)
n++
default:
break loop2
}
}
return -rune(v & 0xff), n
case 'u', 'U':
return decodeUCN(s)
}
if r < '0' || r > '7' {
panic(internalError())
}
v, n := 0, 1
ok := false
loop:
for i := 1; i < len(s); i++ {
r := s[i]
switch {
case i < 4 && r >= '0' && r <= '7':
ok = true
v = v<<3 | (int(r) - '0')
n++
default:
break loop
}
}
if !ok {
ctx.errNode(&tok, "invalid octal sequence")
}
return -rune(v), n
}
// universal-character-name \\u{hex-quad}|\\U{hex-quad}{hex-quad}
func decodeUCN(s string) (rune, int) {
if s[0] != '\\' {
panic(internalError())
}
s = s[1:]
switch s[0] {
case 'u':
return rune(decodeHexQuad(s[1:])), 6
case 'U':
return rune(decodeHexQuad(s[1:])<<16 | decodeHexQuad(s[5:])), 10
}
panic(internalError())
}
// hex-quad {hexadecimal-digit}{hexadecimal-digit}{hexadecimal-digit}{hexadecimal-digit}
func decodeHexQuad(s string) int {
n := 0
for i := 0; i < 4; i++ {
n = n<<4 | decodeHex(s[i])
}
return n
}
func decodeHex(r byte) int {
switch {
case r >= '0' && r <= '9':
return int(r) - '0'
default:
x := int(r) &^ 0x20
return x - 'A' + 10
}
}
func (c *cpp) isNonZero(val interface{}) bool {
switch x := val.(type) {
case int64:
return x != 0
case uint64:
return x != 0
}
panic(internalError())
}
type ppLine interface {
getToks() []token3
}
type ppIfGroupDirective interface {
evalInclusionCondition(*cpp) bool
}
type ppElifDirective struct {
toks []token3
expr []token3
}
func (n *ppElifDirective) getToks() []token3 { return n.toks }
type ppElseDirective struct {
toks []token3
}
func (n *ppElseDirective) getToks() []token3 { return n.toks }
type ppEndifDirective struct {
toks []token3
}
func (n *ppEndifDirective) getToks() []token3 { return n.toks }
type ppEmptyDirective struct {
toks []token3
}
func (n *ppEmptyDirective) getToks() []token3 { return n.toks }
func (n *ppEmptyDirective) translationPhase4(c *cpp) {
// nop
}
type ppIncludeDirective struct {
arg []token3
toks []token3
includeNext bool // false: #include, true: #include_next
}
func (n *ppIncludeDirective) getToks() []token3 { return n.toks }
func (n *ppIncludeDirective) translationPhase4(c *cpp) {
if c.ctx.cfg.ignoreIncludes {
return
}
args := make([]cppToken, 0, len(n.arg))
for _, v := range n.arg {
switch v.char {
case ' ', '\t', '\v', '\f':
// nop
default:
args = append(args, cppToken{token4{token3: v}, nil})
}
}
var sb strings.Builder
for _, v := range args {
sb.WriteString(v.String())
}
nm := strings.TrimSpace(sb.String())
if nm == "" {
c.err(n.toks[0], "invalid empty include argument")
return
}
switch nm[0] {
case '"', '<':
// ok
default:
var w cppWriter
c.expand(&cppReader{buf: args}, &w, false)
x := 0
for _, v := range w.toks {
switch v.char {
case ' ', '\t', '\v', '\f':
// nop
default:
w.toks[x] = v
x++
}
}
w.toks = w.toks[:x]
nm = strings.TrimSpace(cppToksStr(w.toks, ""))
}
toks := n.toks
if c.ctx.cfg.RejectIncludeNext {
c.err(toks[0], "#include_next is a GCC extension")
return
}
if c.ctx.cfg.fakeIncludes {
c.send([]token3{{char: STRINGLITERAL, value: dict.sid(nm), src: dict.sid(nm)}, {char: '\n', value: idNL}})
return
}
if re := c.ctx.cfg.IgnoreInclude; re != nil && re.MatchString(nm) {
return
}
if c.includeLevel == maxIncludeLevel {
c.err(toks[0], "too many include levels")
return
}
c.includeLevel++
defer func() { c.includeLevel-- }()
var (
b byte
paths []string
sys bool
)
switch {
case nm != "" && nm[0] == '"':
paths = c.ctx.includePaths
b = '"'
case nm != "" && nm[0] == '<':
paths = c.ctx.sysIncludePaths
sys = true
b = '>'
case nm == "":
c.err(toks[0], "invalid empty include argument")
return
default:
c.err(toks[0], "invalid include argument %s", nm)
return
}
x := strings.IndexByte(nm[1:], b)
if x < 0 {
c.err(toks[0], "invalid include argument %s", nm)
return
}
nm = filepath.FromSlash(nm[1 : x+1])
var path string
switch {
case filepath.IsAbs(nm):
path = nm
default:
dir := filepath.Dir(c.file.Name())
if n.includeNext {
nmDir, _ := filepath.Split(nm)
for i, v := range paths {
if w, err := filepath.Abs(v); err == nil {
v = w
}
v = filepath.Join(v, nmDir)
if v == dir {
paths = paths[i+1:]
break
}
}
}
for _, v := range paths {
if v == "@" {
v = dir
}
p := filepath.Join(v, nm)
fi, err := c.ctx.statFile(p, sys)
if err != nil || fi.IsDir() {
continue
}
path = p
break
}
}
if path == "" {
wd, _ := os.Getwd()
c.err(toks[0], "include file not found: %s (wd %s)\nsearch paths:\n\t%s", nm, wd, strings.Join(paths, "\n\t"))
return
}
if h := c.ctx.cfg.IncludeFileHandler; h != nil {
var position gotoken.Position
if p := toks[0].Pos(); p.IsValid() {
position = gotoken.Position(c.file.PositionFor(p, true))
}
apath, err := filepath.Abs(path)
if err != nil {
c.err(toks[0], "%s: cannot compute absolute path: %v", path, err)
}
h(position, apath)
}
cf, err := cache.getFile(c.ctx, path, sys, false)
if err != nil {
c.err(toks[0], "%s: %v", path, err)
return
}
pf, err := cf.ppFile()
if err != nil {
c.err(toks[0], "%s: %v", path, err)
return
}
saveFile := c.file
saveFileMacro := c.fileMacro.repl[0].value
c.file = pf.file
c.fileMacro.repl[0].value = dict.sid(fmt.Sprintf("%q", c.file.Name()))
defer func() {
c.file = saveFile
c.fileMacro.repl[0].value = saveFileMacro
}()
pf.translationPhase4(c)
}
func (c *cpp) send(toks []token3) {
c.in <- toks
<-c.rq
}
func (c *cpp) identicalReplacementLists(a, b []token3) bool {
for len(a) != 0 && a[0].char == ' ' {
a = a[1:]
}
for len(b) != 0 && b[0].char == ' ' {
b = b[1:]
}
for len(a) != 0 && a[len(a)-1].char == ' ' {
a = a[:len(a)-1]
}
for len(b) != 0 && b[len(b)-1].char == ' ' {
b = b[:len(b)-1]
}
if len(a) != len(b) {
return false
}
for i, v := range a {
w := b[i]
if v.char != w.char || v.value != w.value {
return false
}
}
return true
}
func stringConst(ctx *context, t cppToken) string {
s := t.String()
switch t.char {
case LONGSTRINGLITERAL:
s = s[1:] // Remove leading 'L'.
fallthrough
case STRINGLITERAL:
var buf bytes.Buffer
for i := 1; i < len(s)-1; {
switch c := s[i]; c {
case '\\':
r, n := decodeEscapeSequence(ctx, t, s[i:])
switch {
case r < 0:
buf.WriteByte(byte(-r))
default:
buf.WriteRune(r)
}
i += n
default:
buf.WriteByte(c)
i++
}
}
return buf.String()
}
panic(internalError())
}
// -------------------------------------------------------- Translation phase 4
// [0], 5.1.1.2, 4
//
// Preprocessing directives are executed, macro invocations are expanded, and
// _Pragma unary operator expressions are executed. If a character sequence
// that matches the syntax of a universal character name is produced by token
// concatenation (6.10.3.3), the behavior is undefined. A #include
// preprocessing directive causes the named header or source file to be
// processed from phase 1 through phase 4, recursively. All preprocessing
// directives are then deleted.
func (c *cpp) translationPhase4(in []source) chan *[]token4 {
c.rq = make(chan struct{}) // Must be unbufferred
c.in = make(chan []token3) // Must be unbufferred
c.out = make(chan *[]token4, 10) //DONE benchmark tuned
go func() {
defer close(c.out)
c.expand(c, c, false)
}()
go func() {
defer close(c.in)
for _, v := range in {
pf, err := v.ppFile()
if err != nil {
c.err(nil, "%s", err)
break
}
c.file = pf.file
c.fileMacro.repl[0].value = dict.sid(fmt.Sprintf("%q", c.file.Name()))
pf.translationPhase4(c)
}
}()
return c.out
}
type ppErrorDirective struct {
toks []token3
msg []token3
}
func (n *ppErrorDirective) getToks() []token3 { return n.toks }
func (n *ppErrorDirective) translationPhase4(c *cpp) {
var b strings.Builder
for _, v := range n.msg {
b.WriteString(v.String())
}
c.err(n.toks[0], "%s", strings.TrimSpace(b.String()))
}
type ppPragmaDirective struct {
toks []token3
args []token3
}
func (n *ppPragmaDirective) getToks() []token3 { return n.toks }
func (n *ppPragmaDirective) translationPhase4(c *cpp) { parsePragma(c, n.args) }
func parsePragma(c *cpp, args0 []token3) {
if len(args0) == 1 { // \n
return
}
if t := args0[0]; t.char == IDENTIFIER && t.value == idSTDC {
p := t
p.char = PRAGMASTDC
p.value = idPragmaSTDC
send := []token3{p, {char: ' ', value: idSpace, src: idSpace, pos: t.pos}}
args := ltrim3(args0[1:])
if len(args) == 0 {
c.err(args[0], "expected argument of STDC")
return
}
if t = args[0]; t.char != IDENTIFIER {
c.err(t, "expected identifier")
return
}
switch t.value {
case idFPContract, idFenvAccess, idCxLimitedRange:
// ok
default:
c.err(t, "expected FP_CONTRACT or FENV_ACCESS or CX_LIMITED_RANGE")
return
}
args = ltrim3(args[1:])
if len(args) == 0 {
c.err(args[0], "expected ON or OFF or DEFAULT")
return
}
if t = args[0]; t.char != IDENTIFIER {
c.err(t, "expected identifier")
return
}
switch t.value {
case idOn, idOff, idDefault:
c.writes(c.cppToks(append(send, args0...)))
default:
c.err(t, "expected ON or OFF or DEFAULT")
return
}
}
if c.ctx.cfg.PragmaHandler == nil {
return
}
var toks []cppToken
for _, v := range args0[:len(args0)-1] {
toks = append(toks, cppToken{token4: token4{file: c.file, token3: v}})
}
if len(toks) == 0 {
return
}
var toks2 []Token
var sep StringID
for _, tok := range toks {
switch tok.char {
case ' ', '\n':
if c.ctx.cfg.PreserveOnlyLastNonBlankSeparator {
if strings.TrimSpace(tok.value.String()) != "" {
sep = tok.value
}
break
}
switch {
case sep != 0:
sep = dict.sid(sep.String() + tok.String()) //TODO quadratic
default:
sep = tok.value
}
default:
var t Token
t.Rune = tok.char
t.Sep = sep
t.Value = tok.value
t.file = tok.file
t.pos = tok.pos
toks2 = append(toks2, t)
sep = 0
}
}
if len(toks2) == 0 {
return
}
// dbg("%v: %q", c.file.PositionFor(args0[0].Pos(), true), tokStr(toks2, "|"))
c.ctx.cfg.PragmaHandler(&pragma{tok: toks[0], c: c}, toks2)
}
type ppNonDirective struct {
toks []token3
}
func (n *ppNonDirective) getToks() []token3 { return n.toks }
func (n *ppNonDirective) translationPhase4(c *cpp) {
// nop
}
type ppTextLine struct {
toks []token3
}
func (n *ppTextLine) getToks() []token3 { return n.toks }
func (n *ppTextLine) translationPhase4(c *cpp) { c.send(n.toks) }
type ppLineDirective struct {
toks []token3
args []token3
nextPos int
}
func (n *ppLineDirective) getToks() []token3 { return n.toks }
func (n *ppLineDirective) translationPhase4(c *cpp) {
toks := expandArgs(c, n.args)
if len(toks) == 0 {
return
}
switch t := toks[0]; t.char {
case PPNUMBER:
ln, err := strconv.ParseInt(t.String(), 10, 31)
if err != nil || ln < 1 {
c.err(t, "expected positive integer less or equal 2147483647")
return
}
for len(toks) != 0 && toks[0].char == ' ' {
toks = toks[1:]
}
if len(toks) == 1 {
c.file.AddLineInfo(int(n.nextPos)-1, c.file.Name(), int(ln))
return
}
toks = toks[1:]
for len(toks) != 0 && toks[0].char == ' ' {
toks = toks[1:]
}
if len(toks) == 0 {
c.file.AddLineInfo(int(n.nextPos)-1, c.file.Name(), int(ln))
return
}
switch t := toks[0]; t.char {
case STRINGLITERAL:
s := t.String()
s = s[1 : len(s)-1]
c.file.AddLineInfo(int(n.nextPos)-1, s, int(ln))
c.fileMacro.repl[0].value = t.value
for len(toks) != 0 && toks[0].char == ' ' {
toks = toks[1:]
}
if len(toks) != 0 && c.ctx.cfg.RejectLineExtraTokens {
c.err(toks[0], "expected new-line")
}
default:
c.err(t, "expected string literal")
return
}
default:
c.err(toks[0], "expected integer literal")
return
}
}
func expandArgs(c *cpp, args []token3) []cppToken {
var w cppWriter
var toks []cppToken
for _, v := range args {
toks = append(toks, cppToken{token4: token4{file: c.file, token3: v}})
}
c.expand(&cppReader{buf: toks}, &w, true)
return w.toks
}
type ppUndefDirective struct {
name token3
toks []token3
}
func (n *ppUndefDirective) getToks() []token3 { return n.toks }
func (n *ppUndefDirective) translationPhase4(c *cpp) {
nm := n.name.value
if _, ok := protectedMacros[nm]; ok || nm == idDefined {
c.err(n.name, "cannot undefine a protected name")
return
}
// dbg("#undef %s", nm)
delete(c.macros, nm)
}
type ppIfdefDirective struct {
name StringID
toks []token3
}
func (n *ppIfdefDirective) evalInclusionCondition(c *cpp) bool { _, ok := c.macros[n.name]; return ok }
func (n *ppIfdefDirective) getToks() []token3 { return n.toks }
type ppIfndefDirective struct {
name StringID
toks []token3
}
func (n *ppIfndefDirective) evalInclusionCondition(c *cpp) bool {
_, ok := c.macros[n.name]
return !ok
}
func (n *ppIfndefDirective) getToks() []token3 { return n.toks }
type ppIfDirective struct {
toks []token3
expr []token3
}
func (n *ppIfDirective) getToks() []token3 { return n.toks }
func (n *ppIfDirective) evalInclusionCondition(c *cpp) bool {
return c.evalInclusionCondition(n.expr)
}
type ppDefineObjectMacroDirective struct {
name token3
toks []token3
replacementList []token3
}
func (n *ppDefineObjectMacroDirective) getToks() []token3 { return n.toks }
func (n *ppDefineObjectMacroDirective) translationPhase4(c *cpp) {
nm := n.name.value
m := c.macros[nm]
if m != nil {
if _, ok := protectedMacros[nm]; ok || nm == idDefined {
c.err(n.name, "cannot define protected name")
return
}
if m.isFnLike {
c.err(n.name, "redefinition of a function-like macro with an object-like one")
}
if !c.identicalReplacementLists(n.replacementList, m.repl) && c.ctx.cfg.RejectIncompatibleMacroRedef {
c.err(n.name, "redefinition with different replacement list")
return
}
}
// find first non-blank token to claim as our location
var pos int32
for _, t := range n.toks {
if t.char != ' ' {
pos = t.pos
break
}
}
// dbg("#define %s %s // %v", n.name, tokStr(n.replacementList, " "), c.file.PositionFor(n.name.Pos(), true))
c.macros[nm] = &Macro{pos: pos, name: token4{token3: n.name, file: c.file}, repl: n.replacementList}
if nm != idGNUC {
return
}
c.ctx.keywords = gccKeywords
}
type ppDefineFunctionMacroDirective struct {
identifierList []token3
toks []token3
replacementList []token3
name token3
namedVariadic bool // foo..., note no comma before ellipsis.
variadic bool
}
func (n *ppDefineFunctionMacroDirective) getToks() []token3 { return n.toks }
func (n *ppDefineFunctionMacroDirective) translationPhase4(c *cpp) {
nm := n.name.value
m := c.macros[nm]
if m != nil {
if _, ok := protectedMacros[nm]; ok || nm == idDefined {
c.err(n.name, "cannot define protected name")
return
}
if !m.isFnLike && c.ctx.cfg.RejectIncompatibleMacroRedef {
c.err(n.name, "redefinition of an object-like macro with a function-like one")
return
}
ok := len(m.fp) == len(n.identifierList)
if ok {
for i, v := range m.fp {
if v != n.identifierList[i].value {
ok = false
break
}
}
}
if !ok && (len(n.replacementList) != 0 || len(m.repl) != 0) && c.ctx.cfg.RejectIncompatibleMacroRedef {
c.err(n.name, "redefinition with different formal parameters")
return
}
if !c.identicalReplacementLists(n.replacementList, m.repl) && c.ctx.cfg.RejectIncompatibleMacroRedef {
c.err(n.name, "redefinition with different replacement list")
return
}
if m.variadic != n.variadic && c.ctx.cfg.RejectIncompatibleMacroRedef {
c.err(n.name, "redefinition differs in being variadic")
return
}
}
nms := map[StringID]struct{}{}
for _, v := range n.identifierList {
if _, ok := nms[v.value]; ok {
c.err(v, "duplicate identifier %s", v.value)
}
}
var fp []StringID
for _, v := range n.identifierList {
fp = append(fp, v.value)
}
// dbg("#define %s %s // %v", n.name, tokStr(n.replacementList, " "), c.file.PositionFor(n.name.Pos(), true))
c.macros[nm] = &Macro{fp: fp, isFnLike: true, name: token4{token3: n.name, file: c.file}, repl: n.replacementList, variadic: n.variadic, namedVariadic: n.namedVariadic}
}
// [0], 6.10.1
//
// elif-group:
// # elif constant-expression new-line group_opt
type ppElifGroup struct {
elif *ppElifDirective
groups []ppGroup
}
func (n *ppElifGroup) evalInclusionCondition(c *cpp) bool {
if !c.evalInclusionCondition(n.elif.expr) {
return false
}
for _, v := range n.groups {
v.translationPhase4(c)
}
return true
}
// [0], 6.10.1
//
// else-group:
// # else new-line group_opt
type ppElseGroup struct {
elseLine *ppElseDirective
groups []ppGroup
}
func (n *ppElseGroup) translationPhase4(c *cpp) {
if n == nil {
return
}
for _, v := range n.groups {
v.translationPhase4(c)
}
}
// [0], 6.10.1
//
// PreprocessingFile:
// GroupOpt
type ppFile struct {
file *tokenFile
groups []ppGroup
}
func (n *ppFile) translationPhase4(c *cpp) {
c.ctx.tuSourcesAdd(1)
if f := n.file; f != nil {
c.ctx.tuSizeAdd(int64(f.Size()))
}
for _, v := range n.groups {
v.translationPhase4(c)
}
}
// [0], 6.10.1
//
// group-part:
// if-section
// control-line
// text-line
// # non-directive
type ppGroup interface {
translationPhase4(*cpp)
}
// [0], 6.10.1
//
// if-group:
// # if constant-expression new-line group opt
// # ifdef identifier new-line group opt
// # ifndef identifier new-line group opt
type ppIfGroup struct {
directive ppIfGroupDirective
groups []ppGroup
}
func (n *ppIfGroup) evalInclusionCondition(c *cpp) bool {
if !n.directive.evalInclusionCondition(c) {
return false
}
for _, v := range n.groups {
v.translationPhase4(c)
}
return true
}
// [0], 6.10.1
//
// if-section:
// if-group elif-groups_opt else-group_opt endif-line
type ppIfSection struct {
ifGroup *ppIfGroup
elifGroups []*ppElifGroup
elseGroup *ppElseGroup
endifLine *ppEndifDirective
}
func (n *ppIfSection) translationPhase4(c *cpp) {
if !n.ifGroup.evalInclusionCondition(c) {
for _, v := range n.elifGroups {
if v.evalInclusionCondition(c) {
return
}
}
n.elseGroup.translationPhase4(c)
}
}