scc

Simple C99 Compiler
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commit 9e8a53fee324554e6d0dea50071ab51d729096b3
parent ffc1d8068bbe61041c23aaccfa2457280ed97c27
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Mon, 16 Mar 2015 06:12:51 +0000

Add MEM addressing

MEM addressing is intended for static variables.

Diffstat:
cc2/cc2.h | 1+
cc2/code.c | 15+++++++++++++--
cc2/parser.c | 18+++++++++++++-----
3 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/cc2/cc2.h b/cc2/cc2.h @@ -56,6 +56,7 @@ struct symbol { bool public : 1; bool extrn : 1; char type; + unsigned short id; union { struct { Type type; diff --git a/cc2/code.c b/cc2/code.c @@ -97,6 +97,9 @@ addr(char op, Node *np, Addr *addr) case AUTO: addr->u.i = np->u.sym->u.v.off; break; + case MEM: + addr->u.sym = np->u.sym; + break; default: abort(); } @@ -127,7 +130,9 @@ writeout(void) static void addr2txt(Addr *a) -{ +{ + Symbol *sym; + switch (a->kind) { case REG: fputs(regnames[a->u.reg], stdout); @@ -135,11 +140,17 @@ addr2txt(Addr *a) case CONST: printf("%d", a->u.i); break; + case PAR: case AUTO: printf("(IX+%d)", a->u.i); break; case MEM: - case PAR: + sym = a->u.sym; + if (sym->name) + printf("(%s)", sym); + else + printf("(T%u)", sym->id); + break; default: abort(); } diff --git a/cc2/parser.c b/cc2/parser.c @@ -175,38 +175,47 @@ static Symbol * parameter(char *num) { static Symbol tbl[NR_FUNPARAM]; + Symbol *sym; unsigned i = atoi(num); if (!curfun) error(ESYNTAX); if (i >= NR_FUNPARAM) error(EPARNUM); - return &tbl[i]; + sym = &tbl[i]; + sym->id = i; + return sym; } static Symbol * local(char *num) { static Symbol tbl[NR_INT_IDENT]; + Symbol *sym; unsigned i = atoi(num); if (!curfun) error(ESYNTAX); if (i >= NR_INT_IDENT) error(EINTNUM); - return &tbl[i]; + sym = &tbl[i]; + sym->id = i; + return sym; } static Symbol * global(char *num) { static Symbol tbl[NR_EXT_IDENT]; + Symbol *sym; unsigned i = atoi(num); if (i >= NR_EXT_IDENT) error(EEXTNUM); - return &tbl[i]; + sym = &tbl[i]; + sym->id = i; + return sym; } static Node * @@ -446,8 +455,7 @@ declaration(uint8_t t, char class, char *token) Symbol *sym = symbol(t, token); char *s; - if (sym->name) - free(sym->name); + free(sym->name); memset(sym, 0, sizeof(*sym)); sym->type = VAR; sym->u.v.sclass = class;