Fix Clang 10 -Werror,-Wimplicit-int-float-conversion

> idlc/source/astexpression.cxx:330:68: error: implicit conversion from 'sal_Int32' (aka 'int') to 'float' changes value from 2147483647 to 2147483648 [-Werror,-Wimplicit-int-float-conversion]
>                     if (ev->u.fval < SAL_MIN_INT32 || ev->u.fval > SAL_MAX_INT32)
>                                                                  ~ ^~~~~~~~~~~~~
> include/sal/types.h:209:32: note: expanded from macro 'SAL_MAX_INT32'
> #define SAL_MAX_INT32         ((sal_Int32)  0x7FFFFFFF)
>                                ^~~~~~~~~~~~~~~~~~~~~~~
> idlc/source/astexpression.cxx:414:58: error: implicit conversion from 'sal_uInt32' (aka 'unsigned int') to 'float' changes value from 4294967295 to 4294967296 [-Werror,-Wimplicit-int-float-conversion]
>                     if (ev->u.fval < 0.0 || ev->u.fval > SAL_MAX_UINT32)
>                                                        ~ ^~~~~~~~~~~~~~
> include/sal/types.h:210:32: note: expanded from macro 'SAL_MAX_UINT32'
> #define SAL_MAX_UINT32        ((sal_uInt32) 0xFFFFFFFF)
>                                ^~~~~~~~~~~~~~~~~~~~~~~
> idlc/source/astexpression.cxx:492:68: error: implicit conversion from 'sal_Int64' (aka 'long') to 'float' changes value from 9223372036854775807 to 9223372036854775808 [-Werror,-Wimplicit-int-float-conversion]
>                     if (ev->u.fval < SAL_MIN_INT64 || ev->u.fval > SAL_MAX_INT64)
>                                                                  ~ ^~~~~~~~~~~~~
> include/sal/types.h:212:32: note: expanded from macro 'SAL_MAX_INT64'
> #define SAL_MAX_INT64         ((sal_Int64)  SAL_CONST_INT64(0x7FFFFFFFFFFFFFFF))
>                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> idlc/source/astexpression.cxx:501:68: error: implicit conversion from 'sal_Int64' (aka 'long') to 'double' changes value from 9223372036854775807 to 9223372036854775808 [-Werror,-Wimplicit-int-float-conversion]
>                     if (ev->u.dval < SAL_MIN_INT64 || ev->u.dval > SAL_MAX_INT64)
>                                                                  ~ ^~~~~~~~~~~~~
> include/sal/types.h:212:32: note: expanded from macro 'SAL_MAX_INT64'
> #define SAL_MAX_INT64         ((sal_Int64)  SAL_CONST_INT64(0x7FFFFFFFFFFFFFFF))
>                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> idlc/source/astexpression.cxx:574:58: error: implicit conversion from 'sal_uInt64' (aka 'unsigned long') to 'float' changes value from 18446744073709551615 to 18446744073709551616 [-Werror,-Wimplicit-int-float-conversion]
>                     if (ev->u.fval < 0.0 || ev->u.fval > SAL_MAX_UINT64)
>                                                        ~ ^~~~~~~~~~~~~~
> include/sal/types.h:213:32: note: expanded from macro 'SAL_MAX_UINT64'
> #define SAL_MAX_UINT64        ((sal_uInt64) SAL_CONST_UINT64(0xFFFFFFFFFFFFFFFF))
>                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> idlc/source/astexpression.cxx:583:58: error: implicit conversion from 'sal_uInt64' (aka 'unsigned long') to 'double' changes value from 18446744073709551615 to 18446744073709551616 [-Werror,-Wimplicit-int-float-conversion]
>                     if (ev->u.dval < 0.0 || ev->u.dval > SAL_MAX_UINT64)
>                                                        ~ ^~~~~~~~~~~~~~
> include/sal/types.h:213:32: note: expanded from macro 'SAL_MAX_UINT64'
> #define SAL_MAX_UINT64        ((sal_uInt64) SAL_CONST_UINT64(0xFFFFFFFFFFFFFFFF))
>                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Consitently use the new o3tl::convertsToAtLeast/Most(o3tl::roundAway(...), ...)
for all cases in coerce_value that check that a floating-point value falls into
an integer range, even those that don't cause a warning.

The new idlc/test/parser/conversion.tests is deliberately left out of
unoidl/CustomTarget_unoidl-write_test.mk. as unoidl-write doesn't support such
conversions from floating-point to integer types.

Change-Id: Ie00923e665f2bcb306e1e328614c75b9247512ee
Reviewed-on: https://gerrit.libreoffice.org/77353
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/idlc/test/parser/conversion.tests b/idlc/test/parser/conversion.tests
new file mode 100644
index 000000000000..4f1d6bc7d3e9
--- /dev/null
+++ b/idlc/test/parser/conversion.tests
@@ -0,0 +1,79 @@
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+EXPECT SUCCESS "conversion.tests 1":
+constants C {
+    const byte C1 = -128.0;
+    const byte C2 = -127.9;
+    const byte C3 = 254.9;
+    const byte C4 = 255.0;
+    const short C5 = -32768.0;
+    const short C6 = -32767.9;
+    const short C7 = 32766.9;
+    const short C8 = 32767.0;
+    const unsigned short C9 = 0.0;
+    const unsigned short C10 = 0.1;
+    const unsigned short C11 = 65534.9;
+    const unsigned short C12 = 65535.0;
+    const long C13 = -2147483648.0;
+    const long C14 = -2147483647.9;
+    const long C15 = 2147483646.9;
+    const long C16 = 2147483647.0;
+    const unsigned long C17 = 0.0;
+    const unsigned long C18 = 0.1;
+    const unsigned long C19 = 4294967294.9;
+    const unsigned long C20 = 4294967295.0;
+    const hyper C21 = -9223372036854774784.0; // -0x7FFFFFFFFFFFFC00 = -0x1.FFFFFFFFFFFFFp62
+    const hyper C22 = 9223372036854774784.0; // 0x7FFFFFFFFFFFFC00 = 0x1.FFFFFFFFFFFFFp62
+    const unsigned hyper C23 = 0.0;
+    const unsigned hyper C24 = 0.1;
+    const unsigned hyper C25 = 18446744073709549568.0; // 0xFFFFFFFFFFFFF800 = 0x1.FFFFFFFFFFFFFp63
+};
+
+EXPECT FAILURE "conversion.tests 2":
+constants C { const byte C1 = -128.1; };
+
+EXPECT FAILURE "conversion.tests 3":
+constants C { const byte C1 = 255.1; };
+
+EXPECT FAILURE "conversion.tests 4":
+constants C { const short C1 = -32768.1; };
+
+EXPECT FAILURE "conversion.tests 5":
+constants C { const short C1 = 32767.1; };
+
+EXPECT FAILURE "conversion.tests 6":
+constants C { const unsigned short C1 = -0.1; };
+
+EXPECT FAILURE "conversion.tests 7":
+constants C { const unsigned short C1 = 65535.1; };
+
+EXPECT FAILURE "conversion.tests 8":
+constants C { const long C1 = -2147483648.1; };
+
+EXPECT FAILURE "conversion.tests 9":
+constants C { const long C1 = 2147483647.1; };
+
+EXPECT FAILURE "conversion.tests 10":
+constants C { const unsigned long C1 = -0.1; };
+
+EXPECT FAILURE "conversion.tests 11":
+constants C { const unsigned long C1 = 4294967295.1; };
+
+EXPECT FAILURE "conversion.tests 12":
+constants C { const hyper C1 = -9223372036854775808.0; }; // -0x8000000000000000 = -0x1p63
+
+EXPECT FAILURE "conversion.tests 13":
+constants C { const hyper C1 = 9223372036854775807.0; }; // 0x7FFFFFFFFFFFFFFF rounds up to 0x1p63
+
+EXPECT FAILURE "conversion.tests 14":
+constants C { const unsigned hyper C1 = -0.1; };
+
+EXPECT FAILURE "conversion.tests 15":
+constants C { const unsigned hyper C1 = 18446744073709551615.0; };
+    // 0xFFFFFFFFFFFFFFFF rounds up to 0x1p64