scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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commit f46933b11d1f0f91c0898fd180facd09b1899301
parent 93d75a07943f4352dfe617954341c0c7a0ffe532
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Fri,  9 Dec 2016 18:54:29 +0100

[cc1] Add basic cupport for bit fields

This is a first implementation of bitfields which adds the parsing
of the expression and checks all the errors that can happen in a
bitfield declaration, but does nothing with the bit field definition,
so they will act like usual integers (which is allowed by the
standard).

Diffstat:
Mcc1/decl.c | 26+++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/cc1/decl.c b/cc1/decl.c @@ -609,6 +609,7 @@ type(struct decl *dcl) return sym; } +#define NAME(s) (*(s)->name ? (s)->name : "<anonymous>") static Symbol * field(struct decl *dcl) { @@ -618,8 +619,30 @@ field(struct decl *dcl) TINT n = structp->n.elem; int err = 0; - if (empty(sym, tp, 0)) + /* TODO: print name of the field in the errors */ + if (accept(':')) { + Node *np; + TINT n; + + if ((np = iconstexpr()) == NULL) { + unexpected(); + n = 0; + } else { + n = np->sym->u.i; + freetree(np); + } + if (n == 0 && *sym->name) + errorp("zero width for bit-field '%s'", sym->name); + if (tp != booltype && tp != inttype && tp != uinttype) + errorp("bit-field '%s' has invalid type", NAME(sym)); + if (n < 0) + errorp("negative width in bit-field '%s'", NAME(sym)); + else if (n > tp->size*8) + errorp("width of '%s' exceeds its type", NAME(sym)); + } else if (empty(sym, tp, 0)) { return sym; + } + if (tp->op == FTN) { errorp("invalid type in struct/union"); err = 1; @@ -649,6 +672,7 @@ field(struct decl *dcl) return sym; } +#undef NAME static void bad_storage(Type *tp, char *name)