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source: src/Parser/ExpressionNode.cpp @ 960665c

Last change on this file since 960665c was 5a2b0b7, checked in by Andrew Beach <ajbeach@…>, 4 months ago
Reverted the change to the compiler. The other changes are both practically and theoretically correct.
Property mode set to `100644`
File size: 28.8 KB

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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	//
7	// ExpressionNode.cpp --
8	//
9	// Author : Peter A. Buhr
10	// Created On : Sat May 16 13:17:07 2015
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Thu Dec 14 18:57:07 2023
13	// Update Count : 1087
14	//
15
16	#include "ExpressionNode.hpp"
17
18	#include <cassert> // for assert
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==
24
25	#include "AST/BasicKind.hpp" // for BasicKind
26	#include "AST/Expr.hpp" // for NameExpr
27	#include "AST/Type.hpp" // for Type, LengthFlag, DimentionFlag
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
34
35	using namespace std;
36
37	//##############################################################################
38
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
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'; }
54	static inline bool checkF( char c ) { return c == 'f' \|\| c == 'F'; }
55	static inline bool checkD( char c ) { return c == 'd' \|\| c == 'D'; }
56	static inline bool checkF80( char c ) { return c == 'w' \|\| c == 'W'; }
57	static inline bool checkF128( char c ) { return c == 'q' \|\| c == 'Q'; }
58	static inline bool checkL( char c ) { return c == 'l' \|\| c == 'L'; }
59	static inline bool checkI( char c ) { return c == 'i' \|\| c == 'I'; }
60	static inline bool checkB( char c ) { return c == 'b' \|\| c == 'B'; }
61	static inline bool checkX( char c ) { return c == 'x' \|\| c == 'X'; }
62	// static inline bool checkN( char c ) { return c == 'n' \|\| c == 'N'; }
63
64	void lnthSuffix( string & str, int & type, int & ltype ) {
65	// 'u' can appear before or after length suffix
66	string::size_type posn = str.find_last_of( "lL" );
67
68	if ( posn == string::npos ) return; // no suffix
69	size_t end = str.length() - 1;
70	if ( posn == end ) { type = 3; return; } // no length after 'l' => long
71
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;
84	} // if
85	} // if
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
94	} // lnthSuffix
95
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
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;
122	if ( i == last - 1 \|\| (str[i] != '0' && str[i] != '1') ) break;
123	v <<= 1;
124	} // for
125	} // scanbin
126
127	ast::Expr * build_constantInteger(
128	const CodeLocation & location, string & str ) {
129	static const ast::BasicKind kind[2][6] = {
130	// short (h) must be before char (hh) because shorter type has the longer suffix
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, },
133	};
134
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", },
138	}; // lnthsInt
139
140	string str2( "0x0" );
141	unsigned long long int v, v2 = 0; // converted integral value
142	ast::Expr * ret, * ret2;
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
147
148	// special constants
149	if ( str == "0" ) {
150	ret = new ast::ConstantExpr( location, new ast::ZeroType(), str, 0 );
151	goto CLEANUP;
152	} // if
153	if ( str == "1" ) {
154	ret = new ast::ConstantExpr( location, new ast::OneType(), str, 1 );
155	goto CLEANUP;
156	} // if
157
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 ?
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.
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.)
168	string::size_type posn;
169	// pointer value
170	if ( posn = str.find_last_of( "pP" ), posn != string::npos ) {
171	ltype = 5; str.erase( posn, 1 );
172	// size_t
173	} else if ( posn = str.find_last_of( "zZ" ), posn != string::npos ) {
174	Unsigned = true; type = 2; ltype = 4; str.erase( posn, 1 );
175	// signed char
176	} else if ( posn = str.rfind( "hh" ), posn != string::npos ) {
177	type = 1; str.erase( posn, 2 );
178	// signed char
179	} else if ( posn = str.rfind( "HH" ), posn != string::npos ) {
180	type = 1; str.erase( posn, 2 );
181	// short
182	} else if ( posn = str.find_last_of( "hH" ), posn != string::npos ) {
183	type = 0; str.erase( posn, 1 );
184	// int (natural number)
185	} else if ( posn = str.find_last_of( "nN" ), posn != string::npos ) {
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
192	} // if
193
194	// Cannot be just "0"/"1"; sscanf stops at the suffix, if any; value goes over the wall => always generate
195
196	#if ! defined(__SIZEOF_INT128__)
197	if ( type == 5 ) SemanticError( yylloc, "int128 constant is not supported on this target \"%s\"", str.c_str() );
198	#endif // ! __SIZEOF_INT128__
199
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 );
205	#if defined(__SIZEOF_INT128__)
206	} else { // hex int128 constant
207	unsigned int len = str.length();
208	if ( len > (2 + 16 + 16) ) SemanticError( yylloc, "128-bit hexadecimal constant to large \"%s\"", str.c_str() );
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 );
214	} // if
215	sscanf( (char *)str.c_str(), "%llx", &v );
216	#endif // __SIZEOF_INT128__
217	} // if
218	//printf( "%llx %llu\n", v, v );
219	} else if ( checkB( str[1] ) ) { // binary constant ?
220	#if defined(__SIZEOF_INT128__)
221	unsigned int len = str.length();
222	if ( type == 5 && len > 2 + 64 ) {
223	if ( len > 2 + 64 + 64 ) SemanticError( yylloc, "128-bit binary constant to large \"%s\".", str.c_str() );
224	str2 = "0b" + str.substr( len - 64 );
225	str = str.substr( 0, len - 64 );
226	scanbin( str2, v2 );
227	} // if
228	#endif // __SIZEOF_INT128__
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 );
234	#if defined(__SIZEOF_INT128__)
235	} else { // octal int128 constant
236	unsigned int len = str.length();
237	if ( len > 1 + 43 \|\| (len == 1 + 43 && str[0] > '3') ) SemanticError( yylloc, "128-bit octal constant to large \"%s\"", str.c_str() );
238	char buf[32];
239	if ( len <= 1 + 21 ) { // value < 21 octal digitis
240	sscanf( (char *)str.c_str(), "%llo", &v );
241	} else {
242	sscanf( &str[len - 21], "%llo", &v );
243	__int128 val = v; // accumulate bits
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
256	sprintf( buf, "%#llx", v );
257	str = buf;
258	#endif // __SIZEOF_INT128__
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 );
265	#if defined(__SIZEOF_INT128__)
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") )
270	SemanticError( yylloc, "128-bit decimal constant to large \"%s\".", str.c_str() );
271	char buf[32];
272	if ( len <= 19 ) { // value < 19 decimal digitis
273	sscanf( (char *)str.c_str(), "%llu", &v );
274	} else {
275	sscanf( &str[len - 19], "%llu", &v );
276	__int128 val = v; // accumulate bits
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
289	sprintf( buf, "%#llx", v );
290	str = buf;
291	#endif // __SIZEOF_INT128__
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
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 );
303
304	// Constant type is correct for overload resolving.
305	ret = new ast::ConstantExpr( location,
306	new ast::BasicType( kind[Unsigned][type] ), str, v );
307	if ( Unsigned && type < 2 ) { // hh or h, less than int ?
308	// int i = -1uh => 65535 not -1, so cast is necessary for unsigned, which unfortunately eliminates warnings for large values.
309	ret = new ast::CastExpr( location,
310	ret,
311	new ast::BasicType( kind[Unsigned][type] ),
312	ast::ExplicitCast );
313	} else if ( ltype != -1 ) { // explicit length ?
314	if ( ltype == 6 ) { // int128, (int128)constant
315	ret2 = new ast::ConstantExpr( location,
316	new ast::BasicType( ast::BasicKind::LongLongSignedInt ),
317	str2,
318	v2 );
319	ret = build_compoundLiteral( location,
320	DeclarationNode::newFromTypeData(
321	addType(
322	build_basic_type( TypeData::Int128 ),
323	build_signedness( TypeData::Unsigned ) ) ),
324	new InitializerNode(
325	(new InitializerNode( new ExpressionNode( v2 == 0 ? ret2 : ret ) ))->set_last( new InitializerNode( new ExpressionNode( v2 == 0 ? ret : ret2 ) ) ), true )
326	);
327	} else { // explicit length, (length_type)constant
328	ret = new ast::CastExpr( location,
329	ret,
330	new ast::TypeInstType( lnthsInt[Unsigned][ltype], ast::TypeDecl::Dtype ),
331	ast::ExplicitCast );
332	if ( ltype == 5 ) { // pointer, intptr( (uintptr_t)constant )
333	ret = build_func( location,
334	new ExpressionNode(
335	build_varref( location, new string( "intptr" ) ) ),
336	new ExpressionNode( ret ) );
337	} // if
338	} // if
339	} // if
340
341	CLEANUP: ;
342	delete &str; // created by lex
343	return ret;
344	} // build_constantInteger
345
346
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
356	if ( posn == string::npos ) return;
357	explnth = true;
358	posn += 1; // advance to size
359	if ( str[posn] == '3' ) { // 32
360	if ( str[last] != 'x' ) type = 6;
361	else type = 7;
362	} else if ( str[posn] == '6' ) { // 64
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
374	} else {
375	assertf( false, "internal error, bad floating point length %s", str.c_str() );
376	} // if
377	} // checkFnxFloat
378
379
380	ast::Expr * build_constantFloat(
381	const CodeLocation & location, string & str ) {
382	static const ast::BasicKind kind[2][12] = {
383	{ ast::BasicKind::Float, ast::BasicKind::Double, ast::BasicKind::LongDouble, ast::BasicKind::uuFloat80, ast::BasicKind::uuFloat128, ast::BasicKind::uFloat16, ast::BasicKind::uFloat32, ast::BasicKind::uFloat32x, ast::BasicKind::uFloat64, ast::BasicKind::uFloat64x, ast::BasicKind::uFloat128, ast::BasicKind::uFloat128x },
384	{ ast::BasicKind::FloatComplex, ast::BasicKind::DoubleComplex, ast::BasicKind::LongDoubleComplex, ast::BasicKind::NUMBER_OF_BASIC_TYPES, ast::BasicKind::NUMBER_OF_BASIC_TYPES, ast::BasicKind::uFloat16Complex, ast::BasicKind::uFloat32Complex, ast::BasicKind::uFloat32xComplex, ast::BasicKind::uFloat64Complex, ast::BasicKind::uFloat64xComplex, ast::BasicKind::uFloat128Complex, ast::BasicKind::uFloat128xComplex },
385	};
386
387	// floating-point constant has minimum of 2 characters 1. or .1
388	size_t last = str.length() - 1;
389	double v;
390	int type; // 0 => float, 1 => double, 3 => long double, ...
391	bool complx = false; // real, complex
392	bool explnth = false; // explicit literal length
393
394	sscanf( str.c_str(), "%lg", &v );
395
396	if ( checkI( str[last] ) ) { // imaginary ?
397	complx = true;
398	last -= 1; // backup one character
399	} // if
400
401	if ( checkF( str[last] ) ) { // float ?
402	type = 0;
403	} else if ( checkD( str[last] ) ) { // double ?
404	type = 1;
405	} else if ( checkL( str[last] ) ) { // long double ?
406	type = 2;
407	} else if ( checkF80( str[last] ) ) { // __float80 ?
408	type = 3;
409	} else if ( checkF128( str[last] ) ) { // __float128 ?
410	type = 4;
411	} else {
412	type = 1; // double (default if no suffix)
413	checkFnxFloat( str, last, explnth, type );
414	} // if
415
416	if ( ! complx && checkI( str[last - 1] ) ) { // imaginary ?
417	complx = true;
418	} // if
419
420	assert( 0 <= type && type < 12 );
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 );
431	} // if
432
433	delete &str; // created by lex
434	return ret;
435	} // build_constantFloat
436
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() ) {
440	units = "?" + str.substr( posn ); // extract units
441	str.erase( posn ); // remove units
442	} // if
443	} // sepString
444
445	ast::Expr * build_constantChar( const CodeLocation & location, string & str ) {
446	string units; // units
447	sepString( str, units, '\'' ); // separate constant from units
448
449	ast::Expr * ret = new ast::ConstantExpr( location,
450	new ast::BasicType( ast::BasicKind::Char ),
451	str,
452	(unsigned long long int)(unsigned char)str[1] );
453	if ( units.length() != 0 ) {
454	ret = new ast::UntypedExpr( location,
455	new ast::NameExpr( location, units ),
456	{ ret } );
457	} // if
458
459	delete &str; // created by lex
460	return ret;
461	} // build_constantChar
462
463	ast::Expr * build_constantStr(
464	const CodeLocation & location,
465	string & str ) {
466	assert( str.length() > 0 );
467	string units; // units
468	sepString( str, units, '"' ); // separate constant from units
469
470	ast::Type * strtype;
471	switch ( str[0] ) { // str has >= 2 characters, i.e, null string "" => safe to look at subscripts 0/1
472	case 'u':
473	if ( str[1] == '8' ) goto Default; // utf-8 characters => array of char
474	// lookup type of associated typedef
475	strtype = new ast::TypeInstType( "char16_t", ast::TypeDecl::Dtype );
476	break;
477	case 'U':
478	strtype = new ast::TypeInstType( "char32_t", ast::TypeDecl::Dtype );
479	break;
480	case 'L':
481	strtype = new ast::TypeInstType( "wchar_t", ast::TypeDecl::Dtype );
482	break;
483	Default: // char default string type
484	default:
485	strtype = new ast::BasicType( ast::BasicKind::Char );
486	} // switch
487	ast::ArrayType * at = new ast::ArrayType(
488	strtype,
489	// Length is adjusted: +1 for '\0' and -2 for '"'
490	ast::ConstantExpr::from_ulong( location, str.size() + 1 - 2 ),
491	ast::FixedLen,
492	ast::DynamicDim );
493	ast::Expr * ret = new ast::ConstantExpr( location, at, str, std::nullopt );
494	if ( units.length() != 0 ) {
495	ret = new ast::UntypedExpr( location,
496	new ast::NameExpr( location, units ),
497	{ ret } );
498	} // if
499
500	delete &str; // created by lex
501	return ret;
502	} // build_constantStr
503
504	ast::Expr * build_field_name_FLOATING_FRACTIONconstant(
505	const CodeLocation & location, const string & str ) {
506	if ( str.find_first_not_of( "0123456789", 1 ) != string::npos ) SemanticError( yylloc, "invalid tuple index \"%s\".", str.c_str() );
507	ast::Expr * ret = build_constantInteger( location,
508	*new string( str.substr(1) ) );
509	delete &str;
510	return ret;
511	} // build_field_name_FLOATING_FRACTIONconstant
512
513	ast::Expr * build_field_name_FLOATING_DECIMALconstant(
514	const CodeLocation & location, const string & str ) {
515	if ( str[str.size() - 1] != '.' ) SemanticError( yylloc, "invalid tuple index \"%s\".", str.c_str() );
516	ast::Expr * ret = build_constantInteger(
517	location, *new string( str.substr( 0, str.size()-1 ) ) );
518	delete &str;
519	return ret;
520	} // build_field_name_FLOATING_DECIMALconstant
521
522	ast::Expr * build_field_name_FLOATINGconstant( const CodeLocation & location,
523	const string & str ) {
524	// str is of the form A.B -> separate at the . and return member expression
525	int a, b;
526	char dot;
527	stringstream ss( str );
528	ss >> a >> dot >> b;
529	auto ret = new ast::UntypedMemberExpr( location,
530	ast::ConstantExpr::from_int( location, b ),
531	ast::ConstantExpr::from_int( location, a )
532	);
533	delete &str;
534	return ret;
535	} // build_field_name_FLOATINGconstant
536
537	ast::Expr * make_field_name_fraction_constants( const CodeLocation & location,
538	ast::Expr * fieldName,
539	ast::Expr * fracts ) {
540	if ( nullptr == fracts ) {
541	return fieldName;
542	} else if ( auto memberExpr = dynamic_cast<ast::UntypedMemberExpr *>( fracts ) ) {
543	memberExpr->member = make_field_name_fraction_constants( location,
544	fieldName,
545	ast::mutate( memberExpr->aggregate.get() ) );
546	return memberExpr;
547	} else {
548	return new ast::UntypedMemberExpr( location, fracts, fieldName );
549	} // if
550	} // make_field_name_fraction_constants
551
552	ast::Expr * build_field_name_fraction_constants( const CodeLocation & location,
553	ast::Expr * fieldName,
554	ExpressionNode * fracts ) {
555	return make_field_name_fraction_constants( location, fieldName, maybeMoveBuild( fracts ) );
556	} // build_field_name_fraction_constants
557
558	ast::NameExpr * build_varref( const CodeLocation & location,
559	const string * name ) {
560	ast::NameExpr * expr = new ast::NameExpr( location, *name );
561	delete name;
562	return expr;
563	} // build_varref
564
565	ast::QualifiedNameExpr * build_qualified_expr( const CodeLocation & location,
566	const DeclarationNode * decl_node,
567	const ast::NameExpr * name ) {
568	ast::Decl * newDecl = maybeBuild( decl_node );
569	if ( ast::DeclWithType * newDeclWithType = dynamic_cast<ast::DeclWithType *>( newDecl ) ) {
570	if ( const ast::Type * t = newDeclWithType->get_type() ) {
571	if ( auto typeInst = dynamic_cast<const ast::TypeInstType *>( t ) ) {
572	newDecl = new ast::EnumDecl( location, typeInst->name );
573	}
574	}
575	}
576	return new ast::QualifiedNameExpr( location, newDecl, name->name );
577	}
578
579	ast::QualifiedNameExpr * build_qualified_expr( const CodeLocation & location,
580	const ast::EnumDecl * decl,
581	const ast::NameExpr * name ) {
582	return new ast::QualifiedNameExpr( location, decl, name->name );
583	}
584
585	ast::DimensionExpr * build_dimensionref( const CodeLocation & location,
586	const string * name ) {
587	ast::DimensionExpr * expr = new ast::DimensionExpr( location, *name );
588	delete name;
589	return expr;
590	} // build_varref
591
592	// TODO: get rid of this and OperKinds and reuse code from OperatorTable
593	static const char * OperName[] = { // must harmonize with OperKinds
594	// diadic
595	"SizeOf", "AlignOf", "OffsetOf", "?+?", "?-?", "?\\?", "?*?", "?/?", "?%?", "\|\|", "&&",
596	"?\|?", "?&?", "?^?", "Cast", "?<<?", "?>>?", "?<?", "?>?", "?<=?", "?>=?", "?==?", "?!=?",
597	"?=?", "?@=?", "?\\=?", "?*=?", "?/=?", "?%=?", "?+=?", "?-=?", "?<<=?", "?>>=?", "?&=?", "?^=?", "?\|=?",
598	"?[?]", "...",
599	// monadic
600	"+?", "-?", "AddressOf", "*?", "!?", "~?", "++?", "?++", "--?", "?--",
601	}; // OperName
602
603	ast::Expr * build_cast( const CodeLocation & location,
604	DeclarationNode * decl_node,
605	ExpressionNode * expr_node,
606	ast::CastExpr::CastKind kind ) {
607	ast::Type * targetType = maybeMoveBuildType( decl_node );
608	if ( dynamic_cast<ast::VoidType *>( targetType ) ) {
609	delete targetType;
610	return new ast::CastExpr( location,
611	maybeMoveBuild( expr_node ),
612	ast::ExplicitCast, kind );
613	} else {
614	return new ast::CastExpr( location,
615	maybeMoveBuild( expr_node ),
616	targetType,
617	ast::ExplicitCast, kind );
618	} // if
619	} // build_cast
620
621	ast::Expr * build_keyword_cast( const CodeLocation & location,
622	ast::AggregateDecl::Aggregate target,
623	ExpressionNode * expr_node ) {
624	return new ast::KeywordCastExpr( location,
625	maybeMoveBuild( expr_node ),
626	target
627	);
628	}
629
630	ast::Expr * build_virtual_cast( const CodeLocation & location,
631	DeclarationNode * decl_node,
632	ExpressionNode * expr_node ) {
633	return new ast::VirtualCastExpr( location,
634	maybeMoveBuild( expr_node ),
635	maybeMoveBuildType( decl_node )
636	);
637	} // build_virtual_cast
638
639	ast::Expr * build_fieldSel( const CodeLocation & location,
640	ExpressionNode * expr_node,
641	ast::Expr * member ) {
642	return new ast::UntypedMemberExpr( location,
643	member,
644	maybeMoveBuild( expr_node )
645	);
646	} // build_fieldSel
647
648	ast::Expr * build_pfieldSel( const CodeLocation & location,
649	ExpressionNode * expr_node,
650	ast::Expr * member ) {
651	auto deref = new ast::UntypedExpr( location,
652	new ast::NameExpr( location, "*?" )
653	);
654	deref->location = expr_node->location;
655	deref->args.push_back( maybeMoveBuild( expr_node ) );
656	auto ret = new ast::UntypedMemberExpr( location, member, deref );
657	return ret;
658	} // build_pfieldSel
659
660	ast::Expr * build_offsetOf( const CodeLocation & location,
661	DeclarationNode * decl_node,
662	ast::NameExpr * member ) {
663	ast::Expr * ret = new ast::UntypedOffsetofExpr( location,
664	maybeMoveBuildType( decl_node ),
665	member->name
666	);
667	ret->result = new ast::BasicType( ast::BasicKind::LongUnsignedInt );
668	delete member;
669	return ret;
670	} // build_offsetOf
671
672	ast::Expr * build_and_or( const CodeLocation & location,
673	ExpressionNode * expr_node1,
674	ExpressionNode * expr_node2,
675	ast::LogicalFlag flag ) {
676	return new ast::LogicalExpr( location,
677	maybeMoveBuild( expr_node1 ),
678	maybeMoveBuild( expr_node2 ),
679	flag
680	);
681	} // build_and_or
682
683	ast::Expr * build_unary_val( const CodeLocation & location,
684	OperKinds op,
685	ExpressionNode * expr_node ) {
686	std::vector<ast::ptr<ast::Expr>> args;
687	args.push_back( maybeMoveBuild( expr_node ) );
688	return new ast::UntypedExpr( location,
689	new ast::NameExpr( location, OperName[ (int)op ] ),
690	std::move( args )
691	);
692	} // build_unary_val
693
694	ast::Expr * build_binary_val( const CodeLocation & location,
695	OperKinds op,
696	ExpressionNode * expr_node1,
697	ExpressionNode * expr_node2 ) {
698	std::vector<ast::ptr<ast::Expr>> args;
699	args.push_back( maybeMoveBuild( expr_node1 ) );
700	args.push_back( maybeMoveBuild( expr_node2 ) );
701	return new ast::UntypedExpr( location,
702	new ast::NameExpr( location, OperName[ (int)op ] ),
703	std::move( args )
704	);
705	} // build_binary_val
706
707	ast::Expr * build_cond( const CodeLocation & location,
708	ExpressionNode * expr_node1,
709	ExpressionNode * expr_node2,
710	ExpressionNode * expr_node3 ) {
711	return new ast::ConditionalExpr( location,
712	maybeMoveBuild( expr_node1 ),
713	maybeMoveBuild( expr_node2 ),
714	maybeMoveBuild( expr_node3 )
715	);
716	} // build_cond
717
718	ast::Expr * build_tuple( const CodeLocation & location,
719	ExpressionNode * expr_node ) {
720	std::vector<ast::ptr<ast::Expr>> exprs;
721	buildMoveList( expr_node, exprs );
722	return new ast::UntypedTupleExpr( location, std::move( exprs ) );
723	} // build_tuple
724
725	ast::Expr * build_func( const CodeLocation & location,
726	ExpressionNode * function,
727	ExpressionNode * expr_node ) {
728	std::vector<ast::ptr<ast::Expr>> args;
729	buildMoveList( expr_node, args );
730	return new ast::UntypedExpr( location,
731	maybeMoveBuild( function ),
732	std::move( args )
733	);
734	} // build_func
735
736	ast::Expr * build_compoundLiteral( const CodeLocation & location,
737	DeclarationNode * decl_node,
738	InitializerNode * kids ) {
739	// compound literal type
740	ast::Decl * newDecl = maybeBuild( decl_node );
741	// non-sue compound-literal type
742	if ( ast::DeclWithType * newDeclWithType = dynamic_cast<ast::DeclWithType *>( newDecl ) ) {
743	return new ast::CompoundLiteralExpr( location,
744	newDeclWithType->get_type(),
745	maybeMoveBuild( kids ) );
746	// these types do not have associated type information
747	} else if ( auto newDeclStructDecl = dynamic_cast<ast::StructDecl *>( newDecl ) ) {
748	if ( newDeclStructDecl->body ) {
749	return new ast::CompoundLiteralExpr( location,
750	new ast::StructInstType( newDeclStructDecl ),
751	maybeMoveBuild( kids ) );
752	} else {
753	return new ast::CompoundLiteralExpr( location,
754	new ast::StructInstType( newDeclStructDecl->name ),
755	maybeMoveBuild( kids ) );
756	} // if
757	} else if ( auto newDeclUnionDecl = dynamic_cast<ast::UnionDecl *>( newDecl ) ) {
758	if ( newDeclUnionDecl->body ) {
759	return new ast::CompoundLiteralExpr( location,
760	new ast::UnionInstType( newDeclUnionDecl ),
761	maybeMoveBuild( kids ) );
762	} else {
763	return new ast::CompoundLiteralExpr( location,
764	new ast::UnionInstType( newDeclUnionDecl->name ),
765	maybeMoveBuild( kids ) );
766	} // if
767	} else if ( auto newDeclEnumDecl = dynamic_cast<ast::EnumDecl *>( newDecl ) ) {
768	if ( newDeclEnumDecl->body ) {
769	return new ast::CompoundLiteralExpr( location,
770	new ast::EnumInstType( newDeclEnumDecl ),
771	maybeMoveBuild( kids ) );
772	} else {
773	return new ast::CompoundLiteralExpr( location,
774	new ast::EnumInstType( newDeclEnumDecl->name ),
775	maybeMoveBuild( kids ) );
776	} // if
777	} else {
778	assert( false );
779	} // if
780	} // build_compoundLiteral
781
782	// Local Variables: //
783	// tab-width: 4 //
784	// End: //

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