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Prevent divide by zero for / and % operations in constant folding (previously caused compiler SIGFPE), instead "inf" is generated for both cases. This closes #124

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Dale Weiler 2013-08-31 12:57:24 -04:00
parent 9032e78349
commit 69252071ba
1 changed files with 38 additions and 7 deletions
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45
fold.c
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@ -201,11 +201,25 @@ static GMQCC_INLINE bool fold_immediate_true(fold_t *fold, ast_value *v) {
((ast_expression*)(X))->vtype != TYPE_FUNCTION) ((ast_expression*)(X))->vtype != TYPE_FUNCTION)
#define fold_can_2(X, Y) (fold_can_1(X) && fold_can_1(Y)) #define fold_can_2(X, Y) (fold_can_1(X) && fold_can_1(Y))
#define fold_can_div(X) (fold_immvalue_float(X) != 0.0f)
#define fold_immvalue_float(E) ((E)->constval.vfloat) #define fold_immvalue_float(E) ((E)->constval.vfloat)
#define fold_immvalue_vector(E) ((E)->constval.vvec) #define fold_immvalue_vector(E) ((E)->constval.vvec)
#define fold_immvalue_string(E) ((E)->constval.vstring) #define fold_immvalue_string(E) ((E)->constval.vstring)
#ifdef INFINITY
# define fold_infinity_float INFINITY
#else
# define fold_infinity_float (1.0 / 0.0)
#endif /*! INFINITY */
#define fold_infinity_vector \
vec3_create( \
fold_infinity_float, \
fold_infinity_float, \
fold_infinity_float \
)
fold_t *fold_init(parser_t *parser) { fold_t *fold_init(parser_t *parser) {
fold_t *fold = (fold_t*)mem_a(sizeof(fold_t)); fold_t *fold = (fold_t*)mem_a(sizeof(fold_t));
fold->parser = parser; fold->parser = parser;
@ -222,9 +236,11 @@ fold_t *fold_init(parser_t *parser) {
(void)fold_constgen_float (fold, 0.0f); (void)fold_constgen_float (fold, 0.0f);
(void)fold_constgen_float (fold, 1.0f); (void)fold_constgen_float (fold, 1.0f);
(void)fold_constgen_float (fold, -1.0f); (void)fold_constgen_float (fold, -1.0f);
(void)fold_constgen_float (fold, fold_infinity_float); /* +inf */
(void)fold_constgen_vector(fold, vec3_create(0.0f, 0.0f, 0.0f)); (void)fold_constgen_vector(fold, vec3_create(0.0f, 0.0f, 0.0f));
(void)fold_constgen_vector(fold, vec3_create(-1.0f, -1.0f, -1.0f)); (void)fold_constgen_vector(fold, vec3_create(-1.0f, -1.0f, -1.0f));
(void)fold_constgen_vector(fold, fold_infinity_vector); /* +inf */
return fold; return fold;
} }
@ -454,12 +470,23 @@ static GMQCC_INLINE ast_expression *fold_op_mul(fold_t *fold, ast_value *a, ast_
static GMQCC_INLINE ast_expression *fold_op_div(fold_t *fold, ast_value *a, ast_value *b) { static GMQCC_INLINE ast_expression *fold_op_div(fold_t *fold, ast_value *a, ast_value *b) {
if (isfloat(a)) { if (isfloat(a)) {
if (fold_can_2(a, b)) if (fold_can_2(a, b)) {
return fold_constgen_float(fold, fold_immvalue_float(a) / fold_immvalue_float(b)); if (fold_can_div(b))
return fold_constgen_float(fold, fold_immvalue_float(a) / fold_immvalue_float(b));
else
return (ast_expression*)fold->imm_float[3]; /* inf */
}
} else if (isvector(a)) { } else if (isvector(a)) {
if (fold_can_2(a, b)) if (fold_can_2(a, b)) {
return fold_constgen_vector(fold, vec3_mulvf(fold_immvalue_vector(a), 1.0f / fold_immvalue_float(b))); if (fold_can_div(b)) {
else { printf("hit wrong logic\n");
return fold_constgen_vector(fold, vec3_mulvf(fold_immvalue_vector(a), 1.0f / fold_immvalue_float(b)));
}
else {
printf("hit logic\n");
return (ast_expression*)fold->imm_vector[2]; /* inf */
}
} else {
return (ast_expression*)ast_binary_new( return (ast_expression*)ast_binary_new(
fold_ctx(fold), fold_ctx(fold),
INSTR_MUL_VF, INSTR_MUL_VF,
@ -479,8 +506,12 @@ static GMQCC_INLINE ast_expression *fold_op_div(fold_t *fold, ast_value *a, ast_
} }
static GMQCC_INLINE ast_expression *fold_op_mod(fold_t *fold, ast_value *a, ast_value *b) { static GMQCC_INLINE ast_expression *fold_op_mod(fold_t *fold, ast_value *a, ast_value *b) {
if (fold_can_2(a, b)) if (fold_can_2(a, b)) {
return fold_constgen_float(fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) % ((qcint_t)fold_immvalue_float(b)))); if (fold_can_div(b))
return fold_constgen_float(fold, (qcfloat_t)(((qcint_t)fold_immvalue_float(a)) % ((qcint_t)fold_immvalue_float(b))));
else
return (ast_expression*)fold->imm_float[3]; /* inf */
}
return NULL; return NULL;
} }