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c++: Implement C++23 P0330 - Literal Suffixes for ptrdiff_t and size_t.

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Integer literal suffixes for signed size ('z') and unsigned size
(some permutation od 'zu') are provided as a language addition.

gcc/c-family/ChangeLog:

	* c-cppbuiltin.c (c_cpp_builtins): Define __cpp_size_t_suffix.
	* c-lex.c (interpret_integer): Set node type for size literal.

libcpp/ChangeLog:

	* expr.c (interpret_int_suffix): Detect 'z' integer suffix.
	(cpp_classify_number): Compat warning for use of 'z' suffix.
	* include/cpplib.h (struct cpp_options): New flag.
	(enum cpp_warning_reason): New flag.
	(CPP_N_USERDEF): Comment C++0x -> C++11.
	(CPP_N_SIZE_T): New flag for cpp_classify_number.
	* init.c (cpp_set_lang): Initialize new flag.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/udlit-shadow-neg.C: Test for 'z' and 'zu' shadowing.
	* g++.dg/cpp23/feat-cxx2b.C: New test.
	* g++.dg/cpp23/size_t-literals.C: New test.
	* g++.dg/warn/Wsize_t-literals.C: New test.
This commit is contained in:
Ed Smith-Rowland 2021-02-02 16:11:57 -05:00
parent 530203d6e3
commit 1f69e63cfc
9 changed files with 701 additions and 30 deletions
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8
libcpp/include/cpplib.h
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@ -500,6 +500,9 @@ struct cpp_options
/* Nonzero means tokenize C++20 module directives. */
unsigned char module_directives;
/* Nonzero for C++23 size_t literals. */
unsigned char size_t_literals;
/* Holds the name of the target (execution) character set. */
const char *narrow_charset;
@ -626,6 +629,7 @@ enum cpp_warning_reason {
CPP_W_INVALID_PCH,
CPP_W_WARNING_DIRECTIVE,
CPP_W_LITERAL_SUFFIX,
CPP_W_SIZE_T_LITERALS,
CPP_W_DATE_TIME,
CPP_W_PEDANTIC,
CPP_W_C90_C99_COMPAT,
@ -1211,7 +1215,9 @@ struct cpp_num
#define CPP_N_FLOATN 0x400000 /* _FloatN types. */
#define CPP_N_FLOATNX 0x800000 /* _FloatNx types. */
#define CPP_N_USERDEF 0x1000000 /* C++0x user-defined literal. */
#define CPP_N_USERDEF 0x1000000 /* C++11 user-defined literal. */
#define CPP_N_SIZE_T 0x2000000 /* C++23 size_t literal. */
#define CPP_N_WIDTH_FLOATN_NX 0xF0000000 /* _FloatN / _FloatNx value
of N, divided by 16. */