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source: src/Parser/ExpressionNode.cpp @ 0766399

Last change on this file since 0766399 was 2ac78a1, checked in by Peter A. Buhr <pabuhr@…>, 2 months ago
switch to isxdigit and floating point changes
Property mode set to `100644`
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Rev	Line
[b87a5ed]	1	//
	2	// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
	3	//
	4	// The contents of this file are covered under the licence agreement in the
	5	// file "LICENCE" distributed with Cforall.
	6	//
[c92bdcc]	7	// ExpressionNode.cpp --
[0caaa6a]	8	//
[f43df73]	9	// Author : Peter A. Buhr
[b87a5ed]	10	// Created On : Sat May 16 13:17:07 2015
[5b95e67]	11	// Last Modified By : Peter A. Buhr
[2ac78a1]	12	// Last Modified On : Thu Sep 12 22:40:35 2024
	13	// Update Count : 1090
[0caaa6a]	14	//
[b87a5ed]	15
[c92bdcc]	16	#include "ExpressionNode.hpp"
[c468150]	17
[ea6332d]	18	#include <cassert> // for assert
[d180746]	19	#include <stdio.h> // for sscanf, size_t
	20	#include <climits> // for LLONG_MAX, LONG_MAX, INT_MAX, UINT...
	21	#include <list> // for list
	22	#include <sstream> // for basic_istream::operator>>, basic_i...
	23	#include <string> // for string, operator+, operator==
[51b7345]	24
[7a780ad]	25	#include "AST/BasicKind.hpp" // for BasicKind
[bb7422a]	26	#include "AST/Expr.hpp" // for NameExpr
[7a780ad]	27	#include "AST/Type.hpp" // for Type, LengthFlag, DimentionFlag
[c92bdcc]	28	#include "Common/SemanticError.hpp"// for SemanticError
	29	#include "Common/Utility.hpp" // for maybeMoveBuild, maybeBuild, CodeLo...
	30	#include "DeclarationNode.hpp" // for DeclarationNode
	31	#include "InitializerNode.hpp" // for InitializerNode
	32	#include "TypeData.hpp" // for addType, build_basic_type, build_c...
	33	#include "ParserUtility.hpp" // for notZeroExpr
[d180746]	34
[51b7345]	35	using namespace std;
	36
[cd623a4]	37	//##############################################################################
	38
[7bf7fb9]	39	// Difficult to separate extra parts of constants during lexing because actions are not allow in the middle of patterns:
	40	//
	41	// prefix action constant action suffix
	42	//
	43	// Alternatively, breaking a pattern using BEGIN does not work if the following pattern can be empty:
	44	//
	45	// constant BEGIN CONT ...
	46	// <CONT>(...)? BEGIN 0 ... // possible empty suffix
	47	//
	48	// because the CONT rule is NOT triggered if the pattern is empty. Hence, constants are reparsed here to determine their
	49	// type.
	50
[ba01b14]	51	// static inline bool checkH( char c ) { return c == 'h' \|\| c == 'H'; }
	52	// static inline bool checkZ( char c ) { return c == 'z' \|\| c == 'Z'; }
	53	// static inline bool checkU( char c ) { return c == 'u' \|\| c == 'U'; }
[7bf7fb9]	54	static inline bool checkF( char c ) { return c == 'f' \|\| c == 'F'; }
	55	static inline bool checkD( char c ) { return c == 'd' \|\| c == 'D'; }
[ba01b14]	56	static inline bool checkF80( char c ) { return c == 'w' \|\| c == 'W'; }
	57	static inline bool checkF128( char c ) { return c == 'q' \|\| c == 'Q'; }
[f56c32e]	58	static inline bool checkL( char c ) { return c == 'l' \|\| c == 'L'; }
[7bf7fb9]	59	static inline bool checkI( char c ) { return c == 'i' \|\| c == 'I'; }
[0a2168f]	60	static inline bool checkB( char c ) { return c == 'b' \|\| c == 'B'; }
[7bf7fb9]	61	static inline bool checkX( char c ) { return c == 'x' \|\| c == 'X'; }
[3d8d7a7]	62	// static inline bool checkN( char c ) { return c == 'n' \|\| c == 'N'; }
[f56c32e]	63
	64	void lnthSuffix( string & str, int & type, int & ltype ) {
[c5b55c4]	65	// 'u' can appear before or after length suffix
[f56c32e]	66	string::size_type posn = str.find_last_of( "lL" );
[0a616e0]	67
	68	if ( posn == string::npos ) return; // no suffix
[c5b55c4]	69	size_t end = str.length() - 1;
	70	if ( posn == end ) { type = 3; return; } // no length after 'l' => long
[702e826]	71
[0a616e0]	72	string::size_type next = posn + 1; // advance to length
	73	if ( str[next] == '3' ) { // 32
	74	type = ltype = 2;
	75	} else if ( str[next] == '6' ) { // 64
	76	type = ltype = 3;
	77	} else if ( str[next] == '8' ) { // 8
	78	type = ltype = 1;
	79	} else if ( str[next] == '1' ) {
	80	if ( str[next + 1] == '6' ) { // 16
	81	type = ltype = 0;
	82	} else { // 128
	83	type = 5; ltype = 6;
[f56c32e]	84	} // if
	85	} // if
[c5b55c4]	86
	87	char fix = '\0';
	88	if ( str[end] == 'u' \|\| str[end] == 'U' ) fix = str[end]; // ends with 'uU' ?
	89	str.erase( posn ); // remove length suffix and possibly uU
	90	if ( type == 5 ) { // L128 does not need uU
	91	end = str.length() - 1;
	92	if ( str[end] == 'u' \|\| str[end] == 'U' ) str.erase( end ); // ends with 'uU' ? remove
	93	} else if ( fix != '\0' ) str += fix; // put 'uU' back if removed
[f56c32e]	94	} // lnthSuffix
[7bf7fb9]	95
[0a616e0]	96	void valueToType( unsigned long long int & v, bool dec, int & type, bool & Unsigned ) {
	97	// use value to determine type
	98	if ( v <= INT_MAX ) { // signed int
	99	type = 2;
	100	} else if ( v <= UINT_MAX && ! dec ) { // unsigned int
	101	type = 2;
	102	Unsigned = true; // unsigned
	103	} else if ( v <= LONG_MAX ) { // signed long int
	104	type = 3;
	105	} else if ( v <= ULONG_MAX && ( ! dec \|\| LONG_MAX == LLONG_MAX ) ) { // signed long int
	106	type = 3;
	107	Unsigned = true; // unsigned long int
	108	} else if ( v <= LLONG_MAX ) { // signed long long int
	109	type = 4;
	110	} else { // unsigned long long int
	111	type = 4;
	112	Unsigned = true; // unsigned long long int
	113	} // if
	114	} // valueToType
	115
[f6582252]	116	static void scanbin( string & str, unsigned long long int & v ) {
	117	v = 0;
	118	size_t last = str.length() - 1; // last subscript of constant
	119	for ( unsigned int i = 2;; ) { // ignore prefix
	120	if ( str[i] == '1' ) v \|= 1;
	121	i += 1;
[0d0931d]	122	if ( i == last - 1 \|\| (str[i] != '0' && str[i] != '1') ) break;
[f6582252]	123	v <<= 1;
	124	} // for
	125	} // scanbin
	126
[bb7422a]	127	ast::Expr * build_constantInteger(
	128	const CodeLocation & location, string & str ) {
[7a780ad]	129	static const ast::BasicKind kind[2][6] = {
[ba01b14]	130	// short (h) must be before char (hh) because shorter type has the longer suffix
[7a780ad]	131	{ ast::BasicKind::ShortSignedInt, ast::BasicKind::SignedChar, ast::BasicKind::SignedInt, ast::BasicKind::LongSignedInt, ast::BasicKind::LongLongSignedInt, /* BasicKind::SignedInt128 */ ast::BasicKind::LongLongSignedInt, },
	132	{ ast::BasicKind::ShortUnsignedInt, ast::BasicKind::UnsignedChar, ast::BasicKind::UnsignedInt, ast::BasicKind::LongUnsignedInt, ast::BasicKind::LongLongUnsignedInt, /* BasicKind::UnsignedInt128 */ ast::BasicKind::LongLongUnsignedInt, },
[7bf7fb9]	133	};
[76c62b2]	134
[0a616e0]	135	static const char * lnthsInt[2][6] = {
	136	{ "int16_t", "int8_t", "int32_t", "int64_t", "size_t", "uintptr_t", },
	137	{ "uint16_t", "uint8_t", "uint32_t", "uint64_t", "size_t", "uintptr_t", },
[ba01b14]	138	}; // lnthsInt
	139
[f6582252]	140	string str2( "0x0" );
	141	unsigned long long int v, v2 = 0; // converted integral value
[bb7422a]	142	ast::Expr * ret, * ret2;
[0a616e0]	143
	144	int type = -1; // 0 => short, 1 => char, 2 => int, 3 => long int, 4 => long long int, 5 => int128
	145	int ltype = -1; // 0 => 16 bits, 1 => 8 bits, 2 => 32 bits, 3 => 64 bits, 4 => size_t, 5 => intptr, 6 => pointer
	146	bool dec = true, Unsigned = false; // decimal, unsigned constant
[7bf7fb9]	147
[6165ce7]	148	// special constants
	149	if ( str == "0" ) {
[bb7422a]	150	ret = new ast::ConstantExpr( location, new ast::ZeroType(), str, 0 );
[6165ce7]	151	goto CLEANUP;
	152	} // if
	153	if ( str == "1" ) {
[bb7422a]	154	ret = new ast::ConstantExpr( location, new ast::OneType(), str, 1 );
[6165ce7]	155	goto CLEANUP;
	156	} // if
[ea6332d]	157
[f6582252]	158	// 'u' can appear before or after length suffix
	159	if ( str.find_last_of( "uU" ) != string::npos ) Unsigned = true;
	160
	161	if ( isdigit( str[str.length() - 1] ) ) { // no suffix ?
[f56c32e]	162	lnthSuffix( str, type, ltype ); // could have length suffix
	163	} else {
	164	// At least one digit in integer constant, so safe to backup while looking for suffix.
[52a2248]	165	// This declaration and the comma expressions in the conditions mimic
	166	// the declare and check pattern allowed in later compiler versions.
	167	// (Only some early compilers/C++ standards do not support it.)
[15596d7]	168	string::size_type posn;
	169	// pointer value
[52a2248]	170	if ( posn = str.find_last_of( "pP" ), posn != string::npos ) {
[15596d7]	171	ltype = 5; str.erase( posn, 1 );
[0d0931d]	172	// size_t
[52a2248]	173	} else if ( posn = str.find_last_of( "zZ" ), posn != string::npos ) {
[15596d7]	174	Unsigned = true; type = 2; ltype = 4; str.erase( posn, 1 );
[0d0931d]	175	// signed char
[52a2248]	176	} else if ( posn = str.rfind( "hh" ), posn != string::npos ) {
[15596d7]	177	type = 1; str.erase( posn, 2 );
[0d0931d]	178	// signed char
[52a2248]	179	} else if ( posn = str.rfind( "HH" ), posn != string::npos ) {
[15596d7]	180	type = 1; str.erase( posn, 2 );
[0d0931d]	181	// short
[52a2248]	182	} else if ( posn = str.find_last_of( "hH" ), posn != string::npos ) {
[15596d7]	183	type = 0; str.erase( posn, 1 );
[0d0931d]	184	// int (natural number)
[52a2248]	185	} else if ( posn = str.find_last_of( "nN" ), posn != string::npos ) {
[15596d7]	186	type = 2; str.erase( posn, 1 );
	187	} else if ( str.rfind( "ll" ) != string::npos \|\| str.rfind( "LL" ) != string::npos ) {
	188	type = 4;
	189	} else {
	190	lnthSuffix( str, type, ltype );
	191	} // if
[7bf7fb9]	192	} // if
	193
[f6582252]	194	// Cannot be just "0"/"1"; sscanf stops at the suffix, if any; value goes over the wall => always generate
[dbe8e31c]	195
[cf5af9c]	196	#if ! defined(__SIZEOF_INT128__)
[ca9d65e]	197	if ( type == 5 ) SemanticError( yylloc, "int128 constant is not supported on this target \"%s\"", str.c_str() );
[cf5af9c]	198	#endif // ! __SIZEOF_INT128__
[702e826]	199
[f6582252]	200	if ( str[0] == '0' ) { // radix character ?
	201	dec = false;
	202	if ( checkX( str[1] ) ) { // hex constant ?
	203	if ( type < 5 ) { // not L128 ?
	204	sscanf( (char *)str.c_str(), "%llx", &v );
[c5b55c4]	205	#if defined(__SIZEOF_INT128__)
[f6582252]	206	} else { // hex int128 constant
	207	unsigned int len = str.length();
[ca9d65e]	208	if ( len > (2 + 16 + 16) ) SemanticError( yylloc, "128-bit hexadecimal constant to large \"%s\"", str.c_str() );
[702e826]	209	// hex digits < 2^64
	210	if ( len > (2 + 16) ) {
	211	str2 = "0x" + str.substr( len - 16 );
	212	sscanf( (char *)str2.c_str(), "%llx", &v2 );
	213	str = str.substr( 0, len - 16 );
[15596d7]	214	} // if
[f6582252]	215	sscanf( (char *)str.c_str(), "%llx", &v );
[c5b55c4]	216	#endif // __SIZEOF_INT128__
[f6582252]	217	} // if
	218	//printf( "%llx %llu\n", v, v );
	219	} else if ( checkB( str[1] ) ) { // binary constant ?
[c5b55c4]	220	#if defined(__SIZEOF_INT128__)
[013b028]	221	unsigned int len = str.length();
[f6582252]	222	if ( type == 5 && len > 2 + 64 ) {
[ca9d65e]	223	if ( len > 2 + 64 + 64 ) SemanticError( yylloc, "128-bit binary constant to large \"%s\".", str.c_str() );
[f6582252]	224	str2 = "0b" + str.substr( len - 64 );
	225	str = str.substr( 0, len - 64 );
	226	scanbin( str2, v2 );
	227	} // if
[c5b55c4]	228	#endif // __SIZEOF_INT128__
[f6582252]	229	scanbin( str, v );
	230	//printf( "%#llx %llu\n", v, v );
	231	} else { // octal constant
	232	if ( type < 5 ) { // not L128 ?
	233	sscanf( (char *)str.c_str(), "%llo", &v );
[cf5af9c]	234	#if defined(__SIZEOF_INT128__)
[f6582252]	235	} else { // octal int128 constant
	236	unsigned int len = str.length();
[ca9d65e]	237	if ( len > 1 + 43 \|\| (len == 1 + 43 && str[0] > '3') ) SemanticError( yylloc, "128-bit octal constant to large \"%s\"", str.c_str() );
[c5b55c4]	238	char buf[32];
[f6582252]	239	if ( len <= 1 + 21 ) { // value < 21 octal digitis
[c5b55c4]	240	sscanf( (char *)str.c_str(), "%llo", &v );
[f6582252]	241	} else {
	242	sscanf( &str[len - 21], "%llo", &v );
[791028a]	243	__int128 val = v; // accumulate bits
[f6582252]	244	str[len - 21] ='\0'; // shorten string
	245	sscanf( &str[len == 43 ? 1 : 0], "%llo", &v );
	246	val \|= (__int128)v << 63; // store bits
	247	if ( len == 1 + 43 ) { // most significant 2 bits ?
	248	str[2] = '\0'; // shorten string
	249	sscanf( &str[1], "%llo", &v ); // process most significant 2 bits
	250	val \|= (__int128)v << 126; // store bits
	251	} // if
	252	v = val >> 64; v2 = (uint64_t)val; // replace octal constant with 2 hex constants
	253	sprintf( buf, "%#llx", v2 );
	254	str2 = buf;
	255	} // if
[c5b55c4]	256	sprintf( buf, "%#llx", v );
	257	str = buf;
[cf5af9c]	258	#endif // __SIZEOF_INT128__
[f6582252]	259	} // if
	260	//printf( "%#llo %llu\n", v, v );
	261	} // if
	262	} else { // decimal constant ?
	263	if ( type < 5 ) { // not L128 ?
	264	sscanf( (char *)str.c_str(), "%llu", &v );
[cf5af9c]	265	#if defined(__SIZEOF_INT128__)
[f6582252]	266	} else { // decimal int128 constant
	267	#define P10_UINT64 10'000'000'000'000'000'000ULL // 19 zeroes
	268	unsigned int len = str.length();
	269	if ( str.length() == 39 && str > (Unsigned ? "340282366920938463463374607431768211455" : "170141183460469231731687303715884105727") )
[ca9d65e]	270	SemanticError( yylloc, "128-bit decimal constant to large \"%s\".", str.c_str() );
[c5b55c4]	271	char buf[32];
[f6582252]	272	if ( len <= 19 ) { // value < 19 decimal digitis
[c5b55c4]	273	sscanf( (char *)str.c_str(), "%llu", &v );
[f6582252]	274	} else {
	275	sscanf( &str[len - 19], "%llu", &v );
[791028a]	276	__int128 val = v; // accumulate bits
[f6582252]	277	str[len - 19] ='\0'; // shorten string
	278	sscanf( &str[len == 39 ? 1 : 0], "%llu", &v );
	279	val += (__int128)v * (__int128)P10_UINT64; // store bits
	280	if ( len == 39 ) { // most significant 2 bits ?
	281	str[1] = '\0'; // shorten string
	282	sscanf( &str[0], "%llu", &v ); // process most significant 2 bits
	283	val += (__int128)v * (__int128)P10_UINT64 * (__int128)P10_UINT64; // store bits
	284	} // if
	285	v = val >> 64; v2 = (uint64_t)val; // replace decimal constant with 2 hex constants
	286	sprintf( buf, "%#llx", v2 );
	287	str2 = buf;
	288	} // if
[c5b55c4]	289	sprintf( buf, "%#llx", v );
	290	str = buf;
[cf5af9c]	291	#endif // __SIZEOF_INT128__
[f6582252]	292	} // if
	293	//printf( "%llu\n", v );
	294	} // if
	295
	296	if ( type == -1 ) { // no suffix => determine type from value size
	297	valueToType( v, dec, type, Unsigned );
	298	} // if
	299	/* printf( "%s %llo %s %llo\n", str.c_str(), v, str2.c_str(), v2 ); */
	300
[0a616e0]	301	//if ( !( 0 <= type && type <= 6 ) ) { printf( "%s %lu %d %s\n", fred.c_str(), fred.length(), type, str.c_str() ); }
	302	assert( 0 <= type && type <= 6 );
[f56c32e]	303
[a6c5d7c]	304	// Constant type is correct for overload resolving.
[bb7422a]	305	ret = new ast::ConstantExpr( location,
	306	new ast::BasicType( kind[Unsigned][type] ), str, v );
[ba01b14]	307	if ( Unsigned && type < 2 ) { // hh or h, less than int ?
[201aeb9]	308	// int i = -1uh => 65535 not -1, so cast is necessary for unsigned, which unfortunately eliminates warnings for large values.
[bb7422a]	309	ret = new ast::CastExpr( location,
	310	ret,
	311	new ast::BasicType( kind[Unsigned][type] ),
	312	ast::ExplicitCast );
[ba01b14]	313	} else if ( ltype != -1 ) { // explicit length ?
[0a616e0]	314	if ( ltype == 6 ) { // int128, (int128)constant
[bb7422a]	315	ret2 = new ast::ConstantExpr( location,
[7a780ad]	316	new ast::BasicType( ast::BasicKind::LongLongSignedInt ),
[bb7422a]	317	str2,
	318	v2 );
	319	ret = build_compoundLiteral( location,
[6cef439]	320	DeclarationNode::newFromTypeData(
	321	addType(
[e048ece]	322	build_basic_type( TypeData::Int128 ),
	323	build_signedness( TypeData::Unsigned ) ) ),
[bb7422a]	324	new InitializerNode(
[6cef439]	325	(new InitializerNode( new ExpressionNode( v2 == 0 ? ret2 : ret ) ))->set_last( new InitializerNode( new ExpressionNode( v2 == 0 ? ret : ret2 ) ) ), true )
[bb7422a]	326	);
[0a616e0]	327	} else { // explicit length, (length_type)constant
[bb7422a]	328	ret = new ast::CastExpr( location,
	329	ret,
	330	new ast::TypeInstType( lnthsInt[Unsigned][ltype], ast::TypeDecl::Dtype ),
	331	ast::ExplicitCast );
[3d8d7a7]	332	if ( ltype == 5 ) { // pointer, intptr( (uintptr_t)constant )
[bb7422a]	333	ret = build_func( location,
	334	new ExpressionNode(
	335	build_varref( location, new string( "intptr" ) ) ),
	336	new ExpressionNode( ret ) );
[0a616e0]	337	} // if
[201aeb9]	338	} // if
[7b1d5ec]	339	} // if
[e8ccca3]	340
[f56c32e]	341	CLEANUP: ;
[ab57786]	342	delete &str; // created by lex
	343	return ret;
[7bf7fb9]	344	} // build_constantInteger
[51b7345]	345
[201aeb9]	346
[ba01b14]	347	static inline void checkFnxFloat( string & str, size_t last, bool & explnth, int & type ) {
	348	string::size_type posn;
	349	// floating-point constant has minimum of 2 characters, 1. or .1, so safe to look ahead
	350	if ( str[1] == 'x' ) { // hex ?
	351	posn = str.find_last_of( "pP" ); // back for exponent (must have)
	352	posn = str.find_first_of( "fF", posn + 1 ); // forward for size (fF allowed in hex constant)
	353	} else {
	354	posn = str.find_last_of( "fF" ); // back for size (fF not allowed)
	355	} // if
[201aeb9]	356	if ( posn == string::npos ) return;
[ba01b14]	357	explnth = true;
[201aeb9]	358	posn += 1; // advance to size
	359	if ( str[posn] == '3' ) { // 32
[ba01b14]	360	if ( str[last] != 'x' ) type = 6;
	361	else type = 7;
[201aeb9]	362	} else if ( str[posn] == '6' ) { // 64
[ba01b14]	363	if ( str[last] != 'x' ) type = 8;
	364	else type = 9;
	365	} else if ( str[posn] == '8' ) { // 80
	366	type = 3;
	367	} else if ( str[posn] == '1' ) { // 16/128
	368	if ( str[posn + 1] == '6' ) { // 16
	369	type = 5;
	370	} else { // 128
	371	if ( str[last] != 'x' ) type = 10;
	372	else type = 11;
	373	} // if
[201aeb9]	374	} else {
	375	assertf( false, "internal error, bad floating point length %s", str.c_str() );
	376	} // if
[ba01b14]	377	} // checkFnxFloat
[201aeb9]	378
	379
[bb7422a]	380	ast::Expr * build_constantFloat(
	381	const CodeLocation & location, string & str ) {
[7a780ad]	382	static const ast::BasicKind kind[2][12] = {
[2ac78a1]	383	{ ast::BasicKind::Float, ast::BasicKind::Double, ast::BasicKind::LongDouble, ast::BasicKind::Float80, ast::BasicKind::uuFloat128, ast::BasicKind::Float16, ast::BasicKind::Float32, ast::BasicKind::Float32x, ast::BasicKind::Float64, ast::BasicKind::Float64x, ast::BasicKind::Float128, ast::BasicKind::Float128x },
	384	{ ast::BasicKind::FloatComplex, ast::BasicKind::DoubleComplex, ast::BasicKind::LongDoubleComplex, ast::BasicKind::NUMBER_OF_BASIC_TYPES, ast::BasicKind::NUMBER_OF_BASIC_TYPES, ast::BasicKind::Float16Complex, ast::BasicKind::Float32Complex, ast::BasicKind::Float32xComplex, ast::BasicKind::Float64Complex, ast::BasicKind::Float64xComplex, ast::BasicKind::Float128Complex, ast::BasicKind::Float128xComplex },
[7bf7fb9]	385	};
[59c24b6]	386
[ba01b14]	387	// floating-point constant has minimum of 2 characters 1. or .1
[7bf7fb9]	388	size_t last = str.length() - 1;
[d56e5bc]	389	double v;
[ba01b14]	390	int type; // 0 => float, 1 => double, 3 => long double, ...
	391	bool complx = false; // real, complex
	392	bool explnth = false; // explicit literal length
[d56e5bc]	393
	394	sscanf( str.c_str(), "%lg", &v );
[51b7345]	395
[7bf7fb9]	396	if ( checkI( str[last] ) ) { // imaginary ?
	397	complx = true;
	398	last -= 1; // backup one character
	399	} // if
[0caaa6a]	400
[7bf7fb9]	401	if ( checkF( str[last] ) ) { // float ?
[ba01b14]	402	type = 0;
[7bf7fb9]	403	} else if ( checkD( str[last] ) ) { // double ?
[ba01b14]	404	type = 1;
[7bf7fb9]	405	} else if ( checkL( str[last] ) ) { // long double ?
[ba01b14]	406	type = 2;
	407	} else if ( checkF80( str[last] ) ) { // __float80 ?
	408	type = 3;
	409	} else if ( checkF128( str[last] ) ) { // __float128 ?
	410	type = 4;
[201aeb9]	411	} else {
[ba01b14]	412	type = 1; // double (default if no suffix)
	413	checkFnxFloat( str, last, explnth, type );
[7bf7fb9]	414	} // if
[ba01b14]	415
[7bf7fb9]	416	if ( ! complx && checkI( str[last - 1] ) ) { // imaginary ?
	417	complx = true;
	418	} // if
[51b7345]	419
[ba01b14]	420	assert( 0 <= type && type < 12 );
[bb7422a]	421	ast::Expr * ret = new ast::ConstantExpr( location,
	422	new ast::BasicType( kind[complx][type] ),
	423	str,
	424	v );
	425	// explicit length ?
	426	if ( explnth ) {
	427	ret = new ast::CastExpr( location,
	428	ret,
	429	new ast::BasicType( kind[complx][type] ),
	430	ast::ExplicitCast );
[201aeb9]	431	} // if
[76c62b2]	432
[ab57786]	433	delete &str; // created by lex
	434	return ret;
[7bf7fb9]	435	} // build_constantFloat
[51b7345]	436
[76c62b2]	437	static void sepString( string & str, string & units, char delimit ) {
	438	string::size_type posn = str.find_last_of( delimit ) + 1;
	439	if ( posn != str.length() ) {
[e8ccca3]	440	units = "?" + str.substr( posn ); // extract units
[76c62b2]	441	str.erase( posn ); // remove units
	442	} // if
	443	} // sepString
	444
[bb7422a]	445	ast::Expr * build_constantChar( const CodeLocation & location, string & str ) {
[76c62b2]	446	string units; // units
	447	sepString( str, units, '\'' ); // separate constant from units
	448
[bb7422a]	449	ast::Expr * ret = new ast::ConstantExpr( location,
[7a780ad]	450	new ast::BasicType( ast::BasicKind::Char ),
[bb7422a]	451	str,
	452	(unsigned long long int)(unsigned char)str[1] );
[e8ccca3]	453	if ( units.length() != 0 ) {
[bb7422a]	454	ret = new ast::UntypedExpr( location,
	455	new ast::NameExpr( location, units ),
	456	{ ret } );
[e8ccca3]	457	} // if
[76c62b2]	458
[ab57786]	459	delete &str; // created by lex
	460	return ret;
[7bf7fb9]	461	} // build_constantChar
[51b7345]	462
[20c2ade]	463	static bool isoctal( char ch ) {
	464	return ('0' <= ch && ch <= '7');
	465	}
	466
	467	// A "sequence" is the series of characters in a character/string literal
	468	// that becomes a single character value in the runtime value.
	469	static size_t sequenceLength( const std::string & str, size_t pos ) {
	470	// Most "sequences" are just a single character, filter those out:
	471	if ( '\\' != str[pos] ) return 1;
	472	switch ( str[pos + 1] ) {
[5b95e67]	473	// Simple Escape Sequence (\_ where _ is one of the following):
	474	case '\'': case '\"': case '?': case '\\':
	475	case 'a': case 'b': case 'f': case 'n': case 'r': case 't': case 'v':
	476	// GCC Escape Sequence (as simple, just some different letters):
	477	case 'e':
[20c2ade]	478	return 2;
[5b95e67]	479	// Numeric Escape Sequence (\___ where _ is 1-3 octal digits):
	480	case '0': case '1': case '2': case '3':
	481	case '4': case '5': case '6': case '7':
[20c2ade]	482	return ( !isoctal( str[pos + 2] ) ) ? 2 :
[5b95e67]	483	( !isoctal( str[pos + 3] ) ) ? 3 : 4;
	484	// Numeric Escape Sequence (\x_ where _ is 1 or more hexadecimal digits):
	485	case 'x': {
	486	size_t length = 2;
[2ac78a1]	487	while ( isxdigit( str[pos + length] ) ) ++length;
[5b95e67]	488	return length;
	489	}
	490	// Universal Character Name (\u____ where _ is 4 decimal digits):
	491	case 'u':
[20c2ade]	492	return 6;
[5b95e67]	493	// Universal Character Name (\U________ where _ is 8 decimal digits):
	494	case 'U':
[20c2ade]	495	return 10;
[5b95e67]	496	default:
[20c2ade]	497	assertf( false, "Unknown escape sequence (start %c).", str[pos] );
	498	return 1;
	499	}
	500	}
	501
[bb7422a]	502	ast::Expr * build_constantStr(
	503	const CodeLocation & location,
	504	string & str ) {
[6e3eaa57]	505	assert( str.length() > 0 );
[76c62b2]	506	string units; // units
	507	sepString( str, units, '"' ); // separate constant from units
	508
[bb7422a]	509	ast::Type * strtype;
[513e165]	510	switch ( str[0] ) { // str has >= 2 characters, i.e, null string "" => safe to look at subscripts 0/1
[0d0931d]	511	case 'u':
[513e165]	512	if ( str[1] == '8' ) goto Default; // utf-8 characters => array of char
	513	// lookup type of associated typedef
[bb7422a]	514	strtype = new ast::TypeInstType( "char16_t", ast::TypeDecl::Dtype );
[e612146c]	515	break;
[0d0931d]	516	case 'U':
[bb7422a]	517	strtype = new ast::TypeInstType( "char32_t", ast::TypeDecl::Dtype );
[e612146c]	518	break;
[0d0931d]	519	case 'L':
[bb7422a]	520	strtype = new ast::TypeInstType( "wchar_t", ast::TypeDecl::Dtype );
[e612146c]	521	break;
[0d0931d]	522	Default: // char default string type
	523	default:
[5a2b0b7]	524	strtype = new ast::BasicType( ast::BasicKind::Char );
[e612146c]	525	} // switch
[20c2ade]	526
	527	// The dimension value of the type is equal to the number of "sequences"
	528	// not including the openning and closing quotes in the literal plus 1
	529	// for the implicit null terminator.
	530	size_t dimension = 1;
	531	for ( size_t pos = 1 ; pos < str.size() - 1 ;
	532	pos += sequenceLength( str, pos ) ) {
	533	dimension += 1;
	534	}
	535
[bb7422a]	536	ast::ArrayType * at = new ast::ArrayType(
	537	strtype,
[20c2ade]	538	ast::ConstantExpr::from_ulong( location, dimension ),
[bb7422a]	539	ast::FixedLen,
	540	ast::DynamicDim );
	541	ast::Expr * ret = new ast::ConstantExpr( location, at, str, std::nullopt );
[e612146c]	542	if ( units.length() != 0 ) {
[bb7422a]	543	ret = new ast::UntypedExpr( location,
	544	new ast::NameExpr( location, units ),
	545	{ ret } );
[e612146c]	546	} // if
[5809461]	547
[ab57786]	548	delete &str; // created by lex
	549	return ret;
[7bf7fb9]	550	} // build_constantStr
[51b7345]	551
[bb7422a]	552	ast::Expr * build_field_name_FLOATING_FRACTIONconstant(
	553	const CodeLocation & location, const string & str ) {
[ca9d65e]	554	if ( str.find_first_not_of( "0123456789", 1 ) != string::npos ) SemanticError( yylloc, "invalid tuple index \"%s\".", str.c_str() );
[bb7422a]	555	ast::Expr * ret = build_constantInteger( location,
	556	*new string( str.substr(1) ) );
[930f69e]	557	delete &str;
	558	return ret;
	559	} // build_field_name_FLOATING_FRACTIONconstant
	560
[bb7422a]	561	ast::Expr * build_field_name_FLOATING_DECIMALconstant(
	562	const CodeLocation & location, const string & str ) {
[ca9d65e]	563	if ( str[str.size() - 1] != '.' ) SemanticError( yylloc, "invalid tuple index \"%s\".", str.c_str() );
[bb7422a]	564	ast::Expr * ret = build_constantInteger(
	565	location, *new string( str.substr( 0, str.size()-1 ) ) );
[930f69e]	566	delete &str;
	567	return ret;
	568	} // build_field_name_FLOATING_DECIMALconstant
	569
[bb7422a]	570	ast::Expr * build_field_name_FLOATINGconstant( const CodeLocation & location,
	571	const string & str ) {
[8780e30]	572	// str is of the form A.B -> separate at the . and return member expression
	573	int a, b;
	574	char dot;
[f43df73]	575	stringstream ss( str );
[8780e30]	576	ss >> a >> dot >> b;
[bb7422a]	577	auto ret = new ast::UntypedMemberExpr( location,
	578	ast::ConstantExpr::from_int( location, b ),
	579	ast::ConstantExpr::from_int( location, a )
	580	);
[8780e30]	581	delete &str;
	582	return ret;
	583	} // build_field_name_FLOATINGconstant
	584
[bb7422a]	585	ast::Expr * make_field_name_fraction_constants( const CodeLocation & location,
	586	ast::Expr * fieldName,
	587	ast::Expr * fracts ) {
	588	if ( nullptr == fracts ) {
	589	return fieldName;
	590	} else if ( auto memberExpr = dynamic_cast<ast::UntypedMemberExpr *>( fracts ) ) {
	591	memberExpr->member = make_field_name_fraction_constants( location,
	592	fieldName,
	593	ast::mutate( memberExpr->aggregate.get() ) );
	594	return memberExpr;
	595	} else {
	596	return new ast::UntypedMemberExpr( location, fracts, fieldName );
[f43df73]	597	} // if
[8780e30]	598	} // make_field_name_fraction_constants
	599
[bb7422a]	600	ast::Expr * build_field_name_fraction_constants( const CodeLocation & location,
	601	ast::Expr * fieldName,
	602	ExpressionNode * fracts ) {
	603	return make_field_name_fraction_constants( location, fieldName, maybeMoveBuild( fracts ) );
[8780e30]	604	} // build_field_name_fraction_constants
	605
[bb7422a]	606	ast::NameExpr * build_varref( const CodeLocation & location,
	607	const string * name ) {
	608	ast::NameExpr * expr = new ast::NameExpr( location, *name );
[7ecbb7e]	609	delete name;
	610	return expr;
[a2e0687]	611	} // build_varref
[51b1202]	612
[bb7422a]	613	ast::QualifiedNameExpr * build_qualified_expr( const CodeLocation & location,
	614	const DeclarationNode * decl_node,
	615	const ast::NameExpr * name ) {
	616	ast::Decl * newDecl = maybeBuild( decl_node );
	617	if ( ast::DeclWithType * newDeclWithType = dynamic_cast<ast::DeclWithType *>( newDecl ) ) {
	618	if ( const ast::Type * t = newDeclWithType->get_type() ) {
	619	if ( auto typeInst = dynamic_cast<const ast::TypeInstType *>( t ) ) {
	620	newDecl = new ast::EnumDecl( location, typeInst->name );
[b0d9ff7]	621	}
	622	}
	623	}
[bb7422a]	624	return new ast::QualifiedNameExpr( location, newDecl, name->name );
[b0d9ff7]	625	}
	626
[bb7422a]	627	ast::QualifiedNameExpr * build_qualified_expr( const CodeLocation & location,
	628	const ast::EnumDecl * decl,
	629	const ast::NameExpr * name ) {
	630	return new ast::QualifiedNameExpr( location, decl, name->name );
[4e2befe3]	631	}
	632
[bb7422a]	633	ast::DimensionExpr * build_dimensionref( const CodeLocation & location,
	634	const string * name ) {
	635	ast::DimensionExpr * expr = new ast::DimensionExpr( location, *name );
[6e50a6b]	636	delete name;
	637	return expr;
	638	} // build_varref
[ea54f1e]	639
[5809461]	640	// TODO: get rid of this and OperKinds and reuse code from OperatorTable
[a2e0687]	641	static const char * OperName[] = { // must harmonize with OperKinds
[5721a6d]	642	// diadic
[e5f2a67]	643	"SizeOf", "AlignOf", "OffsetOf", "?+?", "?-?", "?\\?", "?*?", "?/?", "?%?", "\|\|", "&&",
[5721a6d]	644	"?\|?", "?&?", "?^?", "Cast", "?<<?", "?>>?", "?<?", "?>?", "?<=?", "?>=?", "?==?", "?!=?",
[e5f2a67]	645	"?=?", "?@=?", "?\\=?", "?*=?", "?/=?", "?%=?", "?+=?", "?-=?", "?<<=?", "?>>=?", "?&=?", "?^=?", "?\|=?",
[d9e2280]	646	"?[?]", "...",
[5721a6d]	647	// monadic
[5809461]	648	"+?", "-?", "AddressOf", "*?", "!?", "~?", "++?", "?++", "--?", "?--",
[a2e0687]	649	}; // OperName
[5721a6d]	650
[bb7422a]	651	ast::Expr * build_cast( const CodeLocation & location,
	652	DeclarationNode * decl_node,
[24d6572]	653	ExpressionNode * expr_node,
	654	ast::CastExpr::CastKind kind ) {
[bb7422a]	655	ast::Type * targetType = maybeMoveBuildType( decl_node );
	656	if ( dynamic_cast<ast::VoidType *>( targetType ) ) {
[064e3ff]	657	delete targetType;
[bb7422a]	658	return new ast::CastExpr( location,
	659	maybeMoveBuild( expr_node ),
[24d6572]	660	ast::ExplicitCast, kind );
[064e3ff]	661	} else {
[bb7422a]	662	return new ast::CastExpr( location,
	663	maybeMoveBuild( expr_node ),
	664	targetType,
[24d6572]	665	ast::ExplicitCast, kind );
[064e3ff]	666	} // if
[a2e0687]	667	} // build_cast
[a5f0529]	668
[bb7422a]	669	ast::Expr * build_keyword_cast( const CodeLocation & location,
	670	ast::AggregateDecl::Aggregate target,
	671	ExpressionNode * expr_node ) {
	672	return new ast::KeywordCastExpr( location,
	673	maybeMoveBuild( expr_node ),
	674	target
	675	);
[9a705dc8]	676	}
	677
[bb7422a]	678	ast::Expr * build_virtual_cast( const CodeLocation & location,
	679	DeclarationNode * decl_node,
	680	ExpressionNode * expr_node ) {
	681	return new ast::VirtualCastExpr( location,
	682	maybeMoveBuild( expr_node ),
	683	maybeMoveBuildType( decl_node )
	684	);
[a2e0687]	685	} // build_virtual_cast
[064e3ff]	686
[bb7422a]	687	ast::Expr * build_fieldSel( const CodeLocation & location,
	688	ExpressionNode * expr_node,
	689	ast::Expr * member ) {
	690	return new ast::UntypedMemberExpr( location,
	691	member,
	692	maybeMoveBuild( expr_node )
	693	);
[a2e0687]	694	} // build_fieldSel
[064e3ff]	695
[bb7422a]	696	ast::Expr * build_pfieldSel( const CodeLocation & location,
	697	ExpressionNode * expr_node,
	698	ast::Expr * member ) {
	699	auto deref = new ast::UntypedExpr( location,
	700	new ast::NameExpr( location, "*?" )
	701	);
[64ac636]	702	deref->location = expr_node->location;
[bb7422a]	703	deref->args.push_back( maybeMoveBuild( expr_node ) );
	704	auto ret = new ast::UntypedMemberExpr( location, member, deref );
[064e3ff]	705	return ret;
[a2e0687]	706	} // build_pfieldSel
[064e3ff]	707
[bb7422a]	708	ast::Expr * build_offsetOf( const CodeLocation & location,
	709	DeclarationNode * decl_node,
	710	ast::NameExpr * member ) {
	711	ast::Expr * ret = new ast::UntypedOffsetofExpr( location,
	712	maybeMoveBuildType( decl_node ),
	713	member->name
	714	);
[7a780ad]	715	ret->result = new ast::BasicType( ast::BasicKind::LongUnsignedInt );
[ac71a86]	716	delete member;
	717	return ret;
[a2e0687]	718	} // build_offsetOf
[064e3ff]	719
[bb7422a]	720	ast::Expr * build_and_or( const CodeLocation & location,
	721	ExpressionNode * expr_node1,
	722	ExpressionNode * expr_node2,
	723	ast::LogicalFlag flag ) {
	724	return new ast::LogicalExpr( location,
[61e362f]	725	maybeMoveBuild( expr_node1 ),
	726	maybeMoveBuild( expr_node2 ),
[bb7422a]	727	flag
	728	);
[a2e0687]	729	} // build_and_or
[51e076e]	730
[bb7422a]	731	ast::Expr * build_unary_val( const CodeLocation & location,
	732	OperKinds op,
	733	ExpressionNode * expr_node ) {
	734	std::vector<ast::ptr<ast::Expr>> args;
[702e826]	735	args.push_back( maybeMoveBuild( expr_node ) );
[bb7422a]	736	return new ast::UntypedExpr( location,
	737	new ast::NameExpr( location, OperName[ (int)op ] ),
	738	std::move( args )
	739	);
[a2e0687]	740	} // build_unary_val
	741
[bb7422a]	742	ast::Expr * build_binary_val( const CodeLocation & location,
	743	OperKinds op,
	744	ExpressionNode * expr_node1,
	745	ExpressionNode * expr_node2 ) {
	746	std::vector<ast::ptr<ast::Expr>> args;
[702e826]	747	args.push_back( maybeMoveBuild( expr_node1 ) );
	748	args.push_back( maybeMoveBuild( expr_node2 ) );
[bb7422a]	749	return new ast::UntypedExpr( location,
	750	new ast::NameExpr( location, OperName[ (int)op ] ),
	751	std::move( args )
	752	);
[a2e0687]	753	} // build_binary_val
	754
[bb7422a]	755	ast::Expr * build_cond( const CodeLocation & location,
	756	ExpressionNode * expr_node1,
	757	ExpressionNode * expr_node2,
	758	ExpressionNode * expr_node3 ) {
	759	return new ast::ConditionalExpr( location,
[61e362f]	760	maybeMoveBuild( expr_node1 ),
[bb7422a]	761	maybeMoveBuild( expr_node2 ),
	762	maybeMoveBuild( expr_node3 )
	763	);
[a2e0687]	764	} // build_cond
[51e076e]	765
[bb7422a]	766	ast::Expr * build_tuple( const CodeLocation & location,
	767	ExpressionNode * expr_node ) {
	768	std::vector<ast::ptr<ast::Expr>> exprs;
[907eccb]	769	buildMoveList( expr_node, exprs );
[bb7422a]	770	return new ast::UntypedTupleExpr( location, std::move( exprs ) );
[a2e0687]	771	} // build_tuple
[9706554]	772
[bb7422a]	773	ast::Expr * build_func( const CodeLocation & location,
	774	ExpressionNode * function,
	775	ExpressionNode * expr_node ) {
	776	std::vector<ast::ptr<ast::Expr>> args;
[7ecbb7e]	777	buildMoveList( expr_node, args );
[bb7422a]	778	return new ast::UntypedExpr( location,
	779	maybeMoveBuild( function ),
	780	std::move( args )
	781	);
[a2e0687]	782	} // build_func
[9706554]	783
[bb7422a]	784	ast::Expr * build_compoundLiteral( const CodeLocation & location,
	785	DeclarationNode * decl_node,
	786	InitializerNode * kids ) {
	787	// compound literal type
	788	ast::Decl * newDecl = maybeBuild( decl_node );
	789	// non-sue compound-literal type
	790	if ( ast::DeclWithType * newDeclWithType = dynamic_cast<ast::DeclWithType *>( newDecl ) ) {
	791	return new ast::CompoundLiteralExpr( location,
	792	newDeclWithType->get_type(),
	793	maybeMoveBuild( kids ) );
[630a82a]	794	// these types do not have associated type information
[bb7422a]	795	} else if ( auto newDeclStructDecl = dynamic_cast<ast::StructDecl *>( newDecl ) ) {
	796	if ( newDeclStructDecl->body ) {
	797	return new ast::CompoundLiteralExpr( location,
	798	new ast::StructInstType( newDeclStructDecl ),
	799	maybeMoveBuild( kids ) );
[fbcde64]	800	} else {
[bb7422a]	801	return new ast::CompoundLiteralExpr( location,
	802	new ast::StructInstType( newDeclStructDecl->name ),
	803	maybeMoveBuild( kids ) );
[fbcde64]	804	} // if
[bb7422a]	805	} else if ( auto newDeclUnionDecl = dynamic_cast<ast::UnionDecl *>( newDecl ) ) {
	806	if ( newDeclUnionDecl->body ) {
	807	return new ast::CompoundLiteralExpr( location,
	808	new ast::UnionInstType( newDeclUnionDecl ),
	809	maybeMoveBuild( kids ) );
[fbcde64]	810	} else {
[bb7422a]	811	return new ast::CompoundLiteralExpr( location,
	812	new ast::UnionInstType( newDeclUnionDecl->name ),
	813	maybeMoveBuild( kids ) );
[fbcde64]	814	} // if
[bb7422a]	815	} else if ( auto newDeclEnumDecl = dynamic_cast<ast::EnumDecl *>( newDecl ) ) {
	816	if ( newDeclEnumDecl->body ) {
	817	return new ast::CompoundLiteralExpr( location,
	818	new ast::EnumInstType( newDeclEnumDecl ),
	819	maybeMoveBuild( kids ) );
[fbcde64]	820	} else {
[bb7422a]	821	return new ast::CompoundLiteralExpr( location,
	822	new ast::EnumInstType( newDeclEnumDecl->name ),
	823	maybeMoveBuild( kids ) );
[fbcde64]	824	} // if
[630a82a]	825	} else {
	826	assert( false );
	827	} // if
[a2e0687]	828	} // build_compoundLiteral
[630a82a]	829
[45ee172]	830	ast::Expr * build_va_arg( const CodeLocation & location,
	831	ExpressionNode * function, DeclarationNode * declaration ) {
	832	return build_func( location,
	833	new ExpressionNode(
	834	build_varref( location, new std::string( "__builtin_va_arg" ) ) ),
	835	function->set_last( new ExpressionNode( new ast::TypeExpr( location,
	836	maybeMoveBuildType( declaration ) ) ) )
	837	);
	838	}
	839
[b87a5ed]	840	// Local Variables: //
	841	// tab-width: 4 //
	842	// End: //

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