shithub: scc

Download patch

ref: 59d88e7aa377b1cb4d333d7e13217e511978709c
parent: e0b2ed14ceb074d192ef69ef8a8b3104d424f0c1
author: Roberto E. Vargas Caballero <[email protected]>
date: Sat Jun 2 04:36:49 EDT 2012 

Added compound statements

This implies add all loops, selections and jumps.


--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 
-OBJS = types.o decl.o lex.o error.o symbol.o
+OBJS = types.o decl.o lex.o error.o symbol.o flow.o main.o
 LIBS =
 
 all: kcc
--- a/decl.c
+++ b/decl.c
@@ -1,4 +1,3 @@
-#include <alloca.h>
 #include <assert.h>
 #include <stddef.h>
 #include <string.h>
@@ -5,16 +4,11 @@
 
 #include "cc.h"
 #include "tokens.h"
-#include "symbol.h"
 #include "types.h"
 
 
 char parser_out_home;
 
-static unsigned char symhash;
-static char symname[TOKSIZ_MAX + 1];
-
-
 #include <stdio.h>	/* TODO: remove this */
 
 static void declarator(void);
@@ -27,8 +21,7 @@
 		declarator();
 		expect(')');
 	} else if (accept(IDENTIFIER)) {
-		strcpy(symname, yytext);
-		symhash = yyhash;
+		;
 	} else {
 		error("expected '(' or identifier before of '%s'", yytext);
 	}
@@ -222,7 +215,7 @@
 		pushtype(PTR);
 	}
 
-	printf("leaving dcl %c\n", yytoken);
+	puts("leaving dcl");
 	return;
 
 duplicated:
@@ -229,34 +222,27 @@
 	error("duplicated '%s'", yytext);
 }
 
-void decl(void)
+char decl(void)
 {
 	struct type *t, *spec;
 
-	spec = specifier();
+	puts("decl");
+	if (!(spec = specifier()))
+		return 0;
 	do {
 		declarator();
 		t = decl_type(spec);
 	} while (accept(','));
-	puts("leaving declaration");
-}
+	expect(';');		/* TODO: initialisation */
 
-void stmt(void)
-{
-	for (;;) {
-		decl();
-		expect(';');
-	}
-
+	puts("leaving decl");
+	return 1;
 }
 
-int main(int argc, char *argv[])
+char decl_list(void)
 {
-	init_lex();
-
-	open_file(NULL);
-	next();
-	stmt();
-
-	return 0;
+	puts("decl_list");
+	while (decl())
+		/* nothing */;
+	puts("leaving decl_list");
 }
--- /dev/null
+++ b/flow.c
@@ -1,0 +1,144 @@
+
+#include <stddef.h>
+
+#include "tokens.h"
+#include "syntax.h"
+
+
+void stmt(void);
+
+void expr(void)
+{
+	puts("expr");
+	puts("leaving expr");
+}
+
+static void do_goto(void)
+{
+	puts("void do_goto");
+	expect(GOTO);
+	expect(IDENTIFIER);
+	puts("leaving void do_goto");
+}
+
+static void do_while(void)
+{
+	puts("void do_while");
+	expect(WHILE);
+	expect('(');
+	expr();
+	expect(')');
+	stmt();
+	puts("leaving void do_while");
+}
+
+static void do_do(void)
+{
+	puts("void do_do");
+	expect(DO);
+	stmt();
+	expect(WHILE);
+	expect('(');
+	expr();
+	expect(')');
+	puts("leaving void do_do");
+}
+
+static void do_for(void)
+{
+	puts("void do_for");
+	expect(FOR);
+	expect('(');
+	if (yytoken != ';')
+		expr();
+	expect(';');
+	if (yytoken != ';')
+		expr();
+	expect(';');
+	if (yytoken != ')')
+		expr();
+	expect(')');
+	stmt();
+	puts("leaving void do_for");
+}
+
+static void do_if(void)
+{
+	puts("void do_if");
+	expect(IF);
+	expect('(');
+	expr();
+	expect(')');
+	stmt();
+	if (accept(ELSE))
+		stmt();
+
+	puts("leaving void do_if");
+}
+
+static void do_switch(void)
+{
+	puts("do_switch");
+	expect(SWITCH);
+	expect('(');
+	expr();
+	expect(')');
+	stmt();
+	puts("leaving do_switch");
+}
+
+void stmt(void)
+{
+	puts("stmt");
+	unsigned char tok;
+
+	switch (yytoken) {
+	case '{':
+		compound();
+		break;
+	case SWITCH:
+		do_switch();
+		break;
+	case IF:
+		do_if();
+		break;
+	case FOR:
+		do_for();
+		break;
+	case DO:
+		do_do();
+		break;
+	case WHILE:
+		do_while();
+		break;
+	case CONTINUE:
+	case BREAK:
+	case RETURN:
+	case GOTO:
+		do_goto();
+		break;
+	case CASE:
+		/* TODO */
+	case DEFAULT:
+		/* TODO */
+		break;
+	case IDENTIFIER:
+		/* TODO: check if it can be a label */
+	default:
+		expr();
+		expect(';');
+		break;
+	}
+	puts("leaving stmt");
+}
+
+void compound(void)
+{
+	puts("compound");
+	if (accept('{')) {
+		decl_list();
+		while (!accept('}'))
+			stmt();
+	}
+	puts("leaving compound");
+}
--- /dev/null
+++ b/main.c
@@ -1,0 +1,19 @@
+
+#include <stddef.h>
+
+extern void open_file(const char *file);
+extern void init_lex();
+extern void next();
+extern void stmt();
+
+
+
+int main(int argc, char *argv[])
+{
+	init_lex();
+	open_file(NULL);
+	next();
+	compound();
+
+	return 0;
+}
--- /dev/null
+++ b/syntax.h
@@ -1,0 +1,8 @@
+#ifndef SYNTAX_H
+#define SYNTAX_H
+
+extern char decl(void);
+extern void compound(void);
+extern void expr(void);
+extern char decl_list(void);
+#endif