scc

Simple C99 Compiler
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commit 9adea1257259dd445efff48073917cc5a6b3f230
parent 40f728bbc37cdce07a2dd000dfa81c0dfe0b307a
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sun, 10 Jan 2016 17:28:26 +0100

Give non used warning in parameter of functions

This warning can be useful, and it is easy to remove it
using dummy assignations.

Diffstat:
cc1/decl.c | 35+++++++++++++++++++++++++++--------
cc1/tests/test014.c | 1+
2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/cc1/decl.c b/cc1/decl.c @@ -140,7 +140,9 @@ parameter(struct decl *dcl) Type *funtp = dcl->parent, *tp = dcl->type; TINT n = funtp->n.elem; char *name = sym->name; + int flags; + flags = 0; switch (dcl->sclass) { case STATIC: case EXTERN: @@ -148,10 +150,10 @@ parameter(struct decl *dcl) errorp("bad storage class in function parameter"); break; case REGISTER: - sym->flags |= ISREGISTER; + flags |= ISREGISTER; break; case NOSCLASS: - sym->flags |= ISAUTO; + flags |= ISAUTO; break; } @@ -180,7 +182,7 @@ parameter(struct decl *dcl) } sym->type = tp; - sym->flags |= ISUSED; /* avoid non used warnings in prototypes */ + sym->flags |= flags; return sym; } @@ -755,6 +757,27 @@ dodcl(int rep, Symbol *(*fun)(struct decl *), unsigned ns, Type *parent) return sym; } +static void +prototype(Symbol *sym) +{ + int n; + Symbol **p; + + emit(ODECL, sym); + /* + * avoid non used warnings in prototypes + */ + n = sym->type->n.elem; + for (p = sym->u.pars; n-- > 0; ++p) { + if (*p == NULL) + continue; + (*p)->flags |= ISUSED; + } + free(sym->u.pars); + sym->u.pars = NULL; + popctx(); +} + void decl(void) { @@ -775,11 +798,7 @@ decl(void) } if (curctx != GLOBALCTX+1 || yytoken == ';') { - /* it is a prototype */ - emit(ODECL, sym); - free(sym->u.pars); - sym->u.pars = NULL; - popctx(); + prototype(sym); expect(';'); return; } diff --git a/cc1/tests/test014.c b/cc1/tests/test014.c @@ -42,6 +42,7 @@ test014.c:32: error: bad storage class in function parameter test014.c:33: error: invalid storage class for function 'func4' test014.c:34: error: invalid type specification test014.c:35: warning: 'f' defined but not used +test014.c:35: warning: 'par' defined but not used test014.c:38: error: conflicting types for 'd' */