cpp.texi: Update for handling of charconsts.
* cpp.texi: Update for handling of charconsts. * cpplex.c (maybe_read_ucs): Don't accept D800-DFFF. Update diagnostics. Skip to the end if the UCS is too short. (cpp_interpret_charconst): Long charconsts issue a warning not an error. * gcc.dg/cpp/charconst.c: New tests. * gcc.dg/cpp/escape.c: New tests. * gcc.dg/cpp/escape-1.c: New tests. * gcc.dg/cpp/escape-2.c: New tests. * gcc.dg/cpp/ucs.c: New tests. From-SVN: r42514
This commit is contained in:
Neil Booth
Neil Booth
parent
75f3e3c8d6
commit
f8710242d3
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@ -1,3 +1,11 @@
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2001-05-23 Neil Booth <neil@daikokuya.demon.co.uk>
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* cpp.texi: Update for handling of charconsts.
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* cpplex.c (maybe_read_ucs): Don't accept D800-DFFF. Update
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diagnostics. Skip to the end if the UCS is too short.
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(cpp_interpret_charconst): Long charconsts issue a warning
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not an error.
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2001-05-23 Richard Henderson <rth@redhat.com>
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* doc/install.texi (alpha-linux): Require binutils 2.11.
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15
gcc/cpp.texi
15
gcc/cpp.texi
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@ -2889,22 +2889,17 @@ same column as it did in the original source file.
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@item The numeric value of character constants in preprocessor expressions.
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The preprocessor interprets character constants in preprocessing
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directives on the host machine. Expressions outside preprocessing
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directives are compiled to be interpreted on the target machine. In the
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normal case of a native compiler, these two environments are the same
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and so character constants will be evaluated identically in both cases.
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However, in the case of a cross compiler, the values may be different.
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The preprocessor and compiler interpret character constants in the same
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way; escape sequences such as @code{\a} are given the values they would
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have on the target machine.
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Multi-character character constants are interpreted a character at a
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time, shifting the previous result left by the number of bits per
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character on the host, and adding the new character. For example, 'ab'
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on an 8-bit host would be interpreted as 'a' * 256 + 'b'. If there are
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more characters in the constant than can fit in the widest native
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integer type on the host, usually a @samp{long}, the behavior is
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undefined.
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Evaluation of wide character constants is not properly implemented yet.
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integer type on the host, usually a @samp{long}, the excess characters
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are ignored and a diagnostic is given.
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@item Source file inclusion.
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66
gcc/cpplex.c
66
gcc/cpplex.c
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@ -1706,46 +1706,48 @@ maybe_read_ucs (pfile, pstr, limit, pc)
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if (CPP_WTRADITIONAL (pfile))
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cpp_warning (pfile, "the meaning of '\\%c' varies with -traditional", c);
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for (length = (c == 'u' ? 4: 8); length; --length)
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length = (c == 'u' ? 4: 8);
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if ((size_t) (limit - p) < length)
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{
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if (p >= limit)
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cpp_error (pfile, "incomplete universal-character-name");
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/* Skip to the end to avoid more diagnostics. */
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p = limit;
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}
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else
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{
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for (; length; length--, p++)
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{
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cpp_error (pfile, "incomplete universal-character-name");
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break;
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c = *p;
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if (ISXDIGIT (c))
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code = (code << 4) + hex_digit_value (c);
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else
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{
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cpp_error (pfile,
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"non-hex digit '%c' in universal-character-name", c);
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/* We shouldn't skip in case there are multibyte chars. */
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break;
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}
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}
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c = *p;
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if (ISXDIGIT (c))
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{
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code = (code << 4) + hex_digit_value (c);
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p++;
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}
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else
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{
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cpp_error (pfile,
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"non-hex digit '%c' in universal-character-name", c);
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break;
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}
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}
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#ifdef TARGET_EBCDIC
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cpp_error (pfile, "universal-character-name on EBCDIC target");
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code = 0x3f; /* EBCDIC invalid character */
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#else
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if (code > 0x9f && !(code & 0x80000000))
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; /* True extended character, OK. */
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else if (code >= 0x20 && code < 0x7f)
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{
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/* ASCII printable character. The C character set consists of all of
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these except $, @ and `. We use hex escapes so that this also
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works with EBCDIC hosts. */
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if (code != 0x24 && code != 0x40 && code != 0x60)
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cpp_error (pfile, "universal-character-name used for '%c'", code);
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}
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else
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cpp_error (pfile, "invalid universal-character-name");
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/* True extended characters are OK. */
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if (code >= 0xa0
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&& !(code & 0x80000000)
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&& !(code >= 0xD800 && code <= 0xDFFF))
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;
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/* The standard permits $, @ and ` to be specified as UCNs. We use
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hex escapes so that this also works with EBCDIC hosts. */
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else if (code == 0x24 || code == 0x40 || code == 0x60)
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;
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/* Don't give another error if one occurred above. */
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else if (length == 0)
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cpp_error (pfile, "universal-character-name out of range");
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#endif
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*pstr = p;
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@ -1970,7 +1972,7 @@ cpp_interpret_charconst (pfile, token, warn_multi, traditional, pchars_seen)
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else if (chars_seen > max_chars)
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{
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chars_seen = max_chars;
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cpp_error (pfile, "character constant too long");
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cpp_warning (pfile, "character constant too long");
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}
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else if (chars_seen > 1 && !traditional && warn_multi)
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cpp_warning (pfile, "multi-character character constant");
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@ -1,3 +1,11 @@
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2001-05-23 Neil Booth <neil@daikokuya.demon.co.uk>
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* gcc.dg/cpp/charconst.c: New tests.
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* gcc.dg/cpp/escape.c: New tests.
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* gcc.dg/cpp/escape-1.c: New tests.
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* gcc.dg/cpp/escape-2.c: New tests.
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* gcc.dg/cpp/ucs.c: New tests.
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2001-05-23 David.Billinghurst <David.Billinghurst@riotinto.com>
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* gcc.misc-tests/linkage.exp: Pass appropriate flags to
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@ -0,0 +1,33 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc. */
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/* { dg-do compile } */
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/* This tests various diagnostics about character constants, for both
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the preprocessor and the compiler.
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Neil Booth, 22 May 2001. */
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#if '' /* { dg-warning "empty" "empty charconst" } */
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#endif
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#if L'' /* { dg-warning "empty" "empty wide charconst" } */
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#endif
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#if 'very long' /* { dg-warning "too long" "long charconst" } */
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#endif
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#if L'very long' /* { dg-warning "too long" "long wide charconst" } */
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#endif
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/* Don't do this test for L'ab'; it depends upon sizeof (wchar_t). */
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#if 'ab' /* { dg-warning "multi-char" "multi-character" } */
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#endif
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void foo ()
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{
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int c = ''; /* { dg-warning "empty" "empty charconst" } */
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c = L''; /* { dg-warning "empty" "empty wide charconst" } */
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c = 'very long'; /* { dg-warning "too long" "long charconst" } */
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c = L'very long'; /* { dg-warning "too long" "long wide charconst" } */
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/* Don't do this test for L'ab'; it depends upon sizeof (wchar_t). */
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c = 'ab'; /* { dg-warning "multi-char" "multi-character" } */
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}
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@ -0,0 +1,39 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc. */
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/* { dg-do compile } */
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/* This tests various diagnostics about escape sequences, for both
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the preprocessor and the compiler.
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Neil Booth, 22 May 2001. */
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#if '\x' /* { dg-error "no following" "\x with no digits" } */
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#endif
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#if '\x400' /* { dg-warning "out of range" "\x out of range" } */
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#endif
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#if '\x0ff' /* { dg-bogus "out of range" "\x out of range" } */
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#endif
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#if '\400' /* { dg-warning "out of range" "\x out of range" } */
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#endif
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#if '\377' /* { dg-bogus "out of range" "bogus \x out of range" } */
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#endif
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#if '\177' != 0x7f /* { dg-bogus "out of range" "bogus \x out of range" } */
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#error bad octal /* { dg-bogus "bad" "bad octal evaluation" } */
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#endif
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#if '\0377' /* { dg-warning "multi" "too long octal" } */
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#endif
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#if '\p' /* { dg-error "unknown escape" "unknown escape seq" } */
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#endif
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void foo ()
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{
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int c;
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c = '\x'; /* { dg-error "no following" "\x with no digits" } */
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c = '\x100'; /* { dg-warning "out of range" "\x out of range" } */
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c = '\x0ff'; /* { dg-bogus "out of range" "\x out of range" } */
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c = '\400'; /* { dg-warning "out of range" "\x out of range" } */
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c = '\377'; /* { dg-bogus "out of range" "bogus \x out of range" } */
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c = '\0377'; /* { dg-warning "multi" "too long octal" } */
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c = '\p'; /* { dg-error "unknown escape" "unknown escape seq" } */
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}
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@ -0,0 +1,20 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc. */
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/* { dg-do compile } */
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/* { dg-options "-pedantic -std=c99 -fno-show-column" } */
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/* This tests various diagnostics with -pedantic about escape
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sequences, for both the preprocessor and the compiler.
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Neil Booth, 22 May 2001. */
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#if '\e' /* { dg-warning "non-ISO" "non-ISO \\e" } */
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#endif
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#if '\u00a0' /* { dg-bogus "unknown" "\\u is known in C99" } */
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#endif
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void foo ()
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{
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int c = '\E'; /* { dg-warning "non-ISO" "non-ISO \\E" } */
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c = '\u00a0'; /* { dg-bogus "unknown" "\\u is known in C99" } */
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}
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@ -0,0 +1,25 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc. */
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/* { dg-do compile } */
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/* { dg-options "-Wtraditional -std=c89 -fno-show-column" } */
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/* This tests various diagnostics with -Wtraditioanl about escape
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sequences, for both the preprocessor and the compiler.
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Neil Booth, 22 May 2001. */
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#if '\a' /* { dg-warning "traditional" "traditional bell" } */
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#endif
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#if '\x1a' != 26 /* { dg-warning "traditional" "traditional hex" } */
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#error bad hex /* { dg-bogus "bad" "bad hexadecimal evaluation" } */
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#endif
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#if '\u' /* { dg-warning "unknown" "\u is unknown in C89" } */
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#endif
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void foo ()
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{
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int c = '\a'; /* { dg-warning "traditional" "traditional bell" } */
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c = '\xa1'; /* { dg-warning "traditional" "traditional hex" } */
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c = '\u'; /* { dg-warning "unknown" "\u is unknown in C89" } */
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}
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@ -0,0 +1,35 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc. */
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/* { dg-do compile } */
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/* { dg-options "-std=c99" } */
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/* This tests universal character sequences.
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Neil Booth, 22 May 2001. */
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#if L'\u1234' != 0x1234
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#error bad short ucs /* { dg-bogus "bad" "bad \u1234 evaluation" } */
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#endif
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#if L'\U1234abcd' != 0x1234abcd
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#error bad long ucs /* { dg-bogus "bad" "bad \U1234abcd evaluation" } */
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#endif
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void foo ()
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{
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int c;
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c = L'\ubad'; /* { dg-error "incomplete" "incompete UCN 1" } */
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c = L"\U1234"[0]; /* { dg-error "incomplete" "incompete UCN 2" } */
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c = L'\u000x'; /* { dg-error "non-hex" "non-hex digit in UCN" } */
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/* { dg-warning "too long" "" { target *-*-* } 24 } */
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c = '\u0024'; /* { dg-bogus "invalid" "0024 is a valid UCN" } */
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c = "\u0040"[0]; /* { dg-bogus "invalid" "0040 is a valid UCN" } */
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c = '\u00a0'; /* { dg-bogus "invalid" "00a0 is a valid UCN" } */
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c = '\U00000060'; /* { dg-bogus "invalid" "0060 is a valid UCN" } */
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c = '\u0025'; /* { dg-error "range" "0025 is an invalid UCN" } */
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c = L"\uD800"[0]; /* { dg-error "range" "D800 is an invalid UCN" } */
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c = L'\U0000DFFF'; /* { dg-error "range" "DFFF is an invalid UCN" } */
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}
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