scc

Simple C99 Compiler
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commit d5735ceb7f5deac28bda7a2daf2e02efa15287c3
parent 8067b9f717456ef392c6d2d1b1c079e5b0bdf090
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Wed, 19 Mar 2014 18:15:51 +0100

Remove flow.c

We are refactoring the code, so if we eliminate some code it is easier
to refactor

Diffstat:
flow.c | 266-------------------------------------------------------------------------------
1 file changed, 0 insertions(+), 266 deletions(-)

diff --git a/flow.c b/flow.c @@ -1,266 +0,0 @@ - -#include <assert.h> -#include <stdint.h> -#include <stdio.h> - -#include "cc.h" -#include "symbol.h" -#include "tokens.h" -#include "syntax.h" -#include "sizes.h" - -static struct node *stmt(void); - - -static unsigned char blocks[NR_BLOCK]; -static unsigned char *blockp = blocks; -struct symbol *curfun; - -static void -push(register unsigned char b) -{ - if (blockp == &blocks[NR_BLOCK]) - error("Too much nesting levels"); - *blockp++ = b; -} - -static void -pop(void) -{ - assert(blockp >= blocks); - --blockp; -} - -static struct node * -Goto(void) -{ - register struct node *np; - register struct symbol *sym; - - - expect(GOTO); - expect(IDEN); - sym = lookup(yytext, NS_LABEL); - /* TODO: create the jump */ - expect(';'); - - return np; -} - -static struct node * -While(void) -{ - register struct node *cond, *np; - - expect(WHILE); - expect('('); - cond = expr(); - expect(')'); - push(OWHILE); - np = node(OWHILE, cond, stmt()); - pop(); - return np; -} - -static struct node * -Do(void) -{ - register struct node *cond, *body, *np; - - expect(DO); - body = stmt(); - expect(WHILE); - expect('('); - cond = expr(); - expect(')'); - - push(ODO); - np = node(ODO, body, cond); - pop(); - return np; -} - -static struct node * -For(void) -{ - register struct node *exp1, *exp2, *exp3; - struct node *np; - - expect(FOR); - expect('('); - exp1 = expr(); - expect(';'); - exp2 = expr(); - expect(';'); - exp3 = expr(); - expect(')'); - - push(OFOR); - np = node(OFOR, exp1, - node(O2EXP, exp2, - node(O2EXP, exp3, stmt()))); - pop(); - return np; -} - -static struct node * -If(void) -{ - register struct node *cond, *body; - - expect(IF); - expect('('); - cond = expr(); - expect(')'); - body = stmt(); - - return node(OIF, cond, - node(O2EXP, body, (accept(ELSE)) ? stmt() : NULL)); -} - -static struct node * -Switch(void) -{ - register struct node *cond, *np; - - expect(SWITCH); - expect('('); - cond = expr(); - expect(')'); - - push(OSWITCH); - np = node(OSWITCH, cond, stmt()); - pop(); - return np; -} - -static struct node * -label(void) -{ - - /* TODO: detect repeated labels */ - /* TODO: install in symbol table */ - next(), next(); /* skip IDEN and ':' */ - /* TODO: Do something */ -} - -static struct node * -Break(void) -{ - expect(BREAK); - expect(';'); - if (blockp == blocks) - error("break statement not within loop or switch"); - return node(OBREAK, NULL, NULL); -} - -static struct node * -Continue(void) -{ - register unsigned char *bp; - - expect(CONTINUE); - expect(';'); - - for (bp = blocks; bp < blockp && *bp == OSWITCH; ++bp) - ; /* nothing */ - if (bp == blockp) - error("continue statement not within loop"); - - return node(OCONT, NULL, NULL); -} - -static struct node * -Return(void) -{ - register struct node *np; - - expect(RETURN); - np = expr(); - expect(';'); - - return node(ORETURN, np, NULL); -} - -static struct node * -Case(void) -{ - register unsigned char *bp; - register struct node *np, *exp; - - expect(CASE); - exp = expr(); - /* TODO: check if exp is constant */ - /* TODO: Check if the type is correct */ - for (bp = blocks; bp < blockp && *bp != OSWITCH; ++bp) - ; /* nothing */ - if (bp == blockp) - error("case statement not within switch"); - np = node(OCASE, exp, NULL); - expect(':'); - return np; -} - -static struct node * -Default(void) -{ - register unsigned char *bp; - - expect(DEFAULT); - for (bp = blocks; bp < blockp && *bp != OSWITCH; ++bp) - ; /* nothing */ - if (bp == blockp) - error("default statement not within switch"); - expect(':'); - return node(ODEFAULT, NULL, NULL); -} - -static struct node * -compound(void) -{ - expect('{'); - -repeat: switch (yytoken) { - case TYPE: case SCLASS: case TQUALIFIER: - decl(); - goto repeat; - case '}': - next(); - return NULL; - default: - stmt(); - goto repeat; - } -} - -static struct node * -stmt(void) -{ - register struct node *np; - - switch (yytoken) { - case '{': return context(compound); - case SWITCH: return Switch(); - case IF: return If(); - case FOR: return For(); - case DO: return Do(); - case WHILE: return While(); - case CONTINUE: return Continue(); - case BREAK: return Break(); - case RETURN: return Return(); - case GOTO: return Goto(); - case CASE: return Case(); - case DEFAULT: return Default(); - case IDEN: if (ahead() == ':') return label(); - } - np = expr(); - expect(';'); - return np; -} - -struct node * -function(void) -{ - return node(OFTN, compound(), NULL); -} -