cproc/pp.c -rw-r--r-- 3.2 KiB View raw
                                                                                
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#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
#include "cc.h"

static struct token pending;

static void
keyword(struct token *tok)
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{ static const struct { const char *name; int value; } keywords[] = { {"_Alignas", T_ALIGNAS}, {"_Alignof", T_ALIGNOF}, {"_Atomic", T_ATOMIC}, {"_Bool", T_BOOL}, {"_Complex", T_COMPLEX}, {"_Generic", T_GENERIC}, {"_Imaginary", T_IMAGINARY}, {"_Noreturn", T_NORETURN}, {"_Static_assert", T_STATIC_ASSERT}, {"_Thread_local", T_THREAD_LOCAL}, {"__alignof__", T_ALIGNOF}, {"__asm", T__ASM__}, {"__asm__", T__ASM__}, {"__attribute__", T__ATTRIBUTE__}, {"__inline", TINLINE}, {"__inline__", TINLINE}, {"__signed", TSIGNED}, {"__signed__", TSIGNED}, {"__thread", T_THREAD_LOCAL}, {"__typeof", T__TYPEOF__}, {"__typeof__", T__TYPEOF__}, {"__volatile__", TVOLATILE}, {"auto", TAUTO}, {"break", TBREAK}, {"case", TCASE}, {"char", TCHAR}, {"const", TCONST}, {"continue", TCONTINUE}, {"default", TDEFAULT}, {"do", TDO}, {"double", TDOUBLE}, {"else", TELSE}, {"enum", TENUM}, {"extern", TEXTERN}, {"float", TFLOAT}, {"for", TFOR}, {"goto", TGOTO}, {"if", TIF}, {"inline", TINLINE}, {"int", TINT}, {"long", TLONG}, {"register", TREGISTER}, {"restrict", TRESTRICT}, {"return", TRETURN}, {"short", TSHORT}, {"signed", TSIGNED}, {"sizeof", TSIZEOF}, {"static", TSTATIC}, {"struct", TSTRUCT}, {"switch", TSWITCH}, {"typedef", TTYPEDEF}, {"union", TUNION}, {"unsigned", TUNSIGNED}, {"void", TVOID}, {"volatile", TVOLATILE}, {"while", TWHILE}, }; size_t low = 0, high = LEN(keywords), mid; int cmp; while (low < high) { mid = (low + high) / 2; cmp = strcmp(tok->lit, keywords[mid].name); if (cmp == 0) { free(tok->lit); tok->kind = keywords[mid].value; tok->lit = NULL; break; } if (cmp < 0) high = mid; else low = mid + 1; } } void ppinit(const char *file)
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{ if (scanfrom(file) < 0) fatal("open %s:", file); next(); } static void nextinto(struct token *t)
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{ do scan(t); while (t->kind == TNEWLINE); if (t->kind == TIDENT) keyword(t); } void next(void)
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{ if (pending.kind) { tok = pending; pending.kind = TNONE; } else { nextinto(&tok); } } bool peek(int kind)
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{ if (!pending.kind) nextinto(&pending); if (pending.kind != kind) return false; pending.kind = TNONE; nextinto(&tok); return true; } char * expect(enum tokenkind kind, const char *msg)
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{ char *lit, want[64], got[64]; if (tok.kind != kind) { tokdesc(want, sizeof(want), kind, NULL); tokdesc(got, sizeof(got), tok.kind, tok.lit); error(&tok.loc, "expected %s %s, saw %s", want, msg, got); } lit = tok.lit; next(); return lit; } bool consume(int kind)
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{ if (tok.kind != kind) return false; next(); return true; }