ref: 33ccfecf295bb8a0d44e3622e43242d30376e951
dir: /flow.c/
#include <stdio.h> #include "symbol.h" #include "tokens.h" #include "syntax.h" static struct node *stmt(void); static struct node * do_goto(void) { expect(GOTO); expect(IDEN); return NULL; } static struct node * do_while(void) { expect(WHILE); expect('('); expr(); expect(')'); stmt(); return NULL; } static struct node * do_do(void) { expect(DO); stmt(); expect(WHILE); expect('('); expr(); expect(')'); return NULL; } static struct node * do_for(void) { expect(FOR); expect('('); if (yytoken != ';') expr(); expect(';'); if (yytoken != ';') expr(); expect(';'); if (yytoken != ')') expr(); expect(')'); stmt(); return NULL; } static struct node * do_if(void) { expect(IF); expect('('); expr(); expect(')'); stmt(); if (accept(ELSE)) stmt(); return NULL; } static struct node * do_switch(void) { register struct node *e1; expect(SWITCH); expect('('); e1 = expr(); expect(')'); return node2(OSWITCH, e1, stmt()); } static struct node * stmt(void) { register struct node *np; switch (yytoken) { case '{': return compound(); case SWITCH: return do_switch(); case IF: return do_if(); case FOR: return do_for(); case DO: return do_do(); case WHILE: return do_while(); case CONTINUE: case BREAK: case RETURN: case GOTO: return do_goto(); case CASE: /* TODO */ case DEFAULT: /* TODO */ case IDEN: /* TODO: check if it can be a label */; } np = expr(); expect(';'); return np; } struct node * compound(void) { register struct node *np = nodecomp(); expect('{'); new_ctx(); while (decl()) /* nothing */; while (!accept('}')) addstmt(np, stmt()); del_ctx(); return np; }