scc

Simple C99 Compiler
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commit 277d04a458bad76df8427891e3b8bfb694a7c238
parent c301d4451f6034fc462c8b852c1ba2e397a7892c
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Fri,  8 Aug 2014 19:00:09 +0200

Emit function preambule

This is a first step in the code generation direction. It is
ugly, but we can test with it.

Diffstat:
cc2/cc2.h | 3+++
cc2/cgen.c | 24+++++++++++++++++++++---
cc2/parser.c | 1+
3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/cc2/cc2.h b/cc2/cc2.h @@ -19,6 +19,7 @@ typedef struct symbol { } l; struct { char *name; + short stack; struct symbol *pars; struct symbol *vars; } f; @@ -66,3 +67,4 @@ enum nerrors { extern void error(unsigned nerror, ...); extern void genaddable(Node *list[]); extern void cgen(Symbol *sym, Node *list[]); +extern void genstack(Symbol *fun);+ \ No newline at end of file diff --git a/cc2/cgen.c b/cc2/cgen.c @@ -7,14 +7,32 @@ #include <stdio.h> +void +genstack(Symbol *fun) +{ + Symbol *p; + short siz; + + for (siz = 0, p = fun->u.f.vars; p; p = p->next) + siz += p->u.v.type->size; + fun->u.f.stack = siz; +} static void emit(char what, void *data) { + Symbol *sym, *p; + switch (what) { case FUN: - printf("%s:\n", data); - break; + sym = data; + printf("%s:\n" + "\tPUSH\tIX\n" + "\tLD\tIX,SP\n" + "\tLD\tHL,%d\n" + "\tADD\tHL,SP\n" + "\tLD\tSP,HL\n", sym->u.f.name, -sym->u.f.stack); + return; default: fputs("internal error: incorrect emit\n", stderr); abort(); @@ -24,7 +42,7 @@ emit(char what, void *data) void cgen(Symbol *sym, Node *list[]) { - emit(FUN, sym->u.f.name); + emit(FUN, sym); } /* diff --git a/cc2/parser.c b/cc2/parser.c @@ -305,6 +305,7 @@ endfunction(char *token) { funbody = 0; listp = NULL; + genstack(curfun); genaddable(listexp); cgen(curfun, listexp); }