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f52e630825
This patch is part of a series that moves towards a consistent use of g_assert_not_reached() rather than an ad hoc mix of different assertion mechanisms. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Message-ID: <20240919044641.386068-32-pierrick.bouvier@linaro.org> Signed-off-by: Thomas Huth <thuth@redhat.com>
243 lines
5.1 KiB
C
243 lines
5.1 KiB
C
/*
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* QNum Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.com>
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* Anthony Liguori <aliguori@us.ibm.com>
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* Marc-André Lureau <marcandre.lureau@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/qmp/qnum.h"
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#include "qobject-internal.h"
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/**
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* qnum_from_int(): Create a new QNum from an int64_t
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*
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* Return strong reference.
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*/
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QNum *qnum_from_int(int64_t value)
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{
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QNum *qn = g_new(QNum, 1);
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qobject_init(QOBJECT(qn), QTYPE_QNUM);
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qn->kind = QNUM_I64;
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qn->u.i64 = value;
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return qn;
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}
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/**
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* qnum_from_uint(): Create a new QNum from an uint64_t
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*
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* Return strong reference.
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*/
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QNum *qnum_from_uint(uint64_t value)
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{
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QNum *qn = g_new(QNum, 1);
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qobject_init(QOBJECT(qn), QTYPE_QNUM);
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qn->kind = QNUM_U64;
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qn->u.u64 = value;
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return qn;
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}
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/**
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* qnum_from_double(): Create a new QNum from a double
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*
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* Return strong reference.
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*/
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QNum *qnum_from_double(double value)
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{
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QNum *qn = g_new(QNum, 1);
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qobject_init(QOBJECT(qn), QTYPE_QNUM);
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qn->kind = QNUM_DOUBLE;
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qn->u.dbl = value;
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return qn;
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}
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/**
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* qnum_get_try_int(): Get an integer representation of the number
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*
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* Return true on success.
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*/
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bool qnum_get_try_int(const QNum *qn, int64_t *val)
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{
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switch (qn->kind) {
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case QNUM_I64:
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*val = qn->u.i64;
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return true;
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case QNUM_U64:
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if (qn->u.u64 > INT64_MAX) {
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return false;
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}
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*val = qn->u.u64;
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return true;
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case QNUM_DOUBLE:
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return false;
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}
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g_assert_not_reached();
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}
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/**
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* qnum_get_int(): Get an integer representation of the number
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*
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* assert() on failure.
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*/
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int64_t qnum_get_int(const QNum *qn)
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{
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int64_t val;
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bool success = qnum_get_try_int(qn, &val);
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assert(success);
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return val;
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}
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/**
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* qnum_get_uint(): Get an unsigned integer from the number
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*
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* Return true on success.
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*/
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bool qnum_get_try_uint(const QNum *qn, uint64_t *val)
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{
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switch (qn->kind) {
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case QNUM_I64:
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if (qn->u.i64 < 0) {
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return false;
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}
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*val = qn->u.i64;
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return true;
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case QNUM_U64:
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*val = qn->u.u64;
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return true;
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case QNUM_DOUBLE:
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return false;
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}
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g_assert_not_reached();
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}
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/**
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* qnum_get_uint(): Get an unsigned integer from the number
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*
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* assert() on failure.
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*/
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uint64_t qnum_get_uint(const QNum *qn)
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{
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uint64_t val;
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bool success = qnum_get_try_uint(qn, &val);
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assert(success);
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return val;
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}
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/**
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* qnum_get_double(): Get a float representation of the number
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*
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* qnum_get_double() loses precision for integers beyond 53 bits.
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*/
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double qnum_get_double(QNum *qn)
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{
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switch (qn->kind) {
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case QNUM_I64:
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return qn->u.i64;
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case QNUM_U64:
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return qn->u.u64;
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case QNUM_DOUBLE:
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return qn->u.dbl;
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}
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g_assert_not_reached();
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}
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char *qnum_to_string(QNum *qn)
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{
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switch (qn->kind) {
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case QNUM_I64:
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return g_strdup_printf("%" PRId64, qn->u.i64);
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case QNUM_U64:
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return g_strdup_printf("%" PRIu64, qn->u.u64);
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case QNUM_DOUBLE:
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/* 17 digits suffice for IEEE double */
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return g_strdup_printf("%.17g", qn->u.dbl);
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}
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g_assert_not_reached();
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}
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/**
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* qnum_is_equal(): Test whether the two QNums are equal
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*
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* Negative integers are never considered equal to unsigned integers,
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* but positive integers in the range [0, INT64_MAX] are considered
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* equal independently of whether the QNum's kind is i64 or u64.
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*
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* Doubles are never considered equal to integers.
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*/
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bool qnum_is_equal(const QObject *x, const QObject *y)
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{
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QNum *num_x = qobject_to(QNum, x);
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QNum *num_y = qobject_to(QNum, y);
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switch (num_x->kind) {
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case QNUM_I64:
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switch (num_y->kind) {
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case QNUM_I64:
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/* Comparison in native int64_t type */
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return num_x->u.i64 == num_y->u.i64;
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case QNUM_U64:
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/* Implicit conversion of x to uin64_t, so we have to
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* check its sign before */
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return num_x->u.i64 >= 0 && num_x->u.i64 == num_y->u.u64;
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case QNUM_DOUBLE:
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return false;
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}
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abort();
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case QNUM_U64:
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switch (num_y->kind) {
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case QNUM_I64:
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return qnum_is_equal(y, x);
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case QNUM_U64:
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/* Comparison in native uint64_t type */
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return num_x->u.u64 == num_y->u.u64;
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case QNUM_DOUBLE:
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return false;
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}
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abort();
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case QNUM_DOUBLE:
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switch (num_y->kind) {
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case QNUM_I64:
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case QNUM_U64:
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return false;
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case QNUM_DOUBLE:
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/* Comparison in native double type */
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return num_x->u.dbl == num_y->u.dbl;
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}
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abort();
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}
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abort();
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}
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/**
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* qnum_destroy_obj(): Free all memory allocated by a
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* QNum object
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*/
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void qnum_destroy_obj(QObject *obj)
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{
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assert(obj != NULL);
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g_free(qobject_to(QNum, obj));
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}
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void qnum_unref(QNum *q)
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{
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qobject_unref(q);
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}
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