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source: src/ControlStruct/CaseRangeMutator.cc @ c23e420

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Last change on this file since c23e420 was d3b7937, checked in by Peter A. Buhr <pabuhr@…>, 9 years ago
building runtime library (first attempt)
Property mode set to `100644`
File size: 6.4 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	// CaseRangeMutator.cc --
8	//
9	// Author : Rodolfo G. Esteves
10	// Created On : Mon May 18 07:44:20 2015
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Mon Jan 25 21:22:40 2016
13	// Update Count : 4
14	//
15
16	#include <list>
17	#include <cassert>
18	#include <cstdlib>
19	#include <iterator>
20
21	#include "Common/utility.h"
22
23	#include "SynTree/Statement.h"
24	#include "SynTree/Expression.h"
25	#include "SynTree/Constant.h"
26	#include "SynTree/Type.h"
27	#include "CaseRangeMutator.h"
28
29	namespace ControlStruct {
30	Statement CaseRangeMutator::mutate( ChooseStmt chooseStmt ) {
31	// There shouldn't be any `choose' statements by now, throw an exception or something.
32	throw( 0 ) ; /* FIXME */
33	}
34
35	Statement CaseRangeMutator::mutate( SwitchStmt switchStmt ) {
36	std::list< Statement * > &cases = switchStmt->get_branches();
37
38	// a `for' would be more natural... all this contortions are because `replace' invalidates the iterator
39	std::list< Statement * >::iterator i = cases.begin();
40	while ( i != cases.end() ) {
41	(i )->acceptMutator( this );
42
43	if ( ! newCaseLabels.empty() ) {
44	std::list< Statement * > newCases;
45
46	// transform( newCaseLabels.begin(), newCaseLabels.end(), bnd1st( ptr_fun( ctor< CaseStmt, Label, Expression * > ) ) );
47
48	for ( std::list< Expression * >::iterator j = newCaseLabels.begin();
49	j != newCaseLabels.end(); j++ ) {
50	std::list<Label> emptyLabels;
51	std::list< Statement *> emptyStmts;
52	newCases.push_back( new CaseStmt( emptyLabels, *j, emptyStmts ) );
53	} // for
54
55	if ( CaseStmt currentCase = dynamic_cast< CaseStmt > ( *i ) )
56	if ( ! currentCase->get_statements().empty() ) {
57	CaseStmt lastCase = dynamic_cast< CaseStmt > ( newCases.back() );
58	if ( lastCase == 0 ) { throw ( 0 ); /* FIXME */ } // something is very wrong, as I just made these, and they were all cases
59	// transfer the statement block ( if any ) to the new list:
60	lastCase->set_statements( currentCase->get_statements() );
61	} // if
62	std::list< Statement * >::iterator j = i; advance( j, 1 );
63	replace ( cases, i, newCases );
64	i = j;
65	newCaseLabels.clear();
66	} else
67	i++;
68	} // while
69
70	return switchStmt;
71	}
72
73	Statement CaseRangeMutator::mutate( FallthruStmt fallthruStmt ) {
74	//delete fallthruStmt;
75	return new NullStmt();
76	}
77
78	Statement CaseRangeMutator::mutate( CaseStmt caseStmt ) {
79	UntypedExpr *cond;
80	if ( ( cond = dynamic_cast< UntypedExpr * >( caseStmt->get_condition() )) != 0 ) {
81	NameExpr *nmfunc;
82	if ( ( nmfunc = dynamic_cast< NameExpr *>( cond->get_function() )) != 0 ) {
83	if ( nmfunc->get_name() == std::string("Range") ) {
84	assert( cond->get_args().size() == 2 );
85	std::list<Expression *>::iterator i = cond->get_args().begin();
86	Expression lo = i, hi = (++i ); // "unnecessary" temporaries
87	fillRange( lo, hi );
88	} // if
89	} // if
90	} else if ( TupleExpr tcond = dynamic_cast< TupleExpr >( caseStmt->get_condition() ) ) {
91	// case list
92	assert( ! tcond->get_exprs().empty() );
93	for ( std::list< Expression * >::iterator i = tcond->get_exprs().begin(); i != tcond->get_exprs().end(); i++ )
94	newCaseLabels.push_back( *i ); // do I need to clone them?
95	} // if
96
97	std::list< Statement * > &stmts = caseStmt->get_statements();
98	mutateAll ( stmts, *this );
99
100	return caseStmt;
101	}
102
103	void CaseRangeMutator::fillRange( Expression lo, Expression hi ) {
104	// generate the actual range ( and check for consistency )
105	Constant c_lo, c_hi;
106	ConstantExpr ce_lo, ce_hi;
107	ce_lo = dynamic_cast< ConstantExpr * >( lo );
108	ce_hi = dynamic_cast< ConstantExpr * >( hi );
109
110	if ( ce_lo && ce_hi ) {
111	c_lo = ce_lo->get_constant(); c_hi = ce_hi->get_constant();
112	} /* else {
113	if ( ! ce_lo ) ;
114	if ( ! ce_hi ) ;
115	} */
116	BasicType ty_lo = dynamic_cast< BasicType >( c_lo->get_type() ),
117	ty_hi = dynamic_cast< BasicType >( c_hi->get_type() );
118
119	if ( ! ty_lo \|\| ! ty_hi )
120	return; // one of them is not a constant
121
122	switch ( ty_lo->get_kind() ) {
123	case BasicType::Char:
124	case BasicType::UnsignedChar:
125	switch ( ty_hi->get_kind() ) {
126	case BasicType::Char:
127	case BasicType::UnsignedChar:
128	// first case, they are both printable ASCII characters represented as 'x'
129	if ( c_lo->get_value().size() == 3 && c_hi->get_value().size() == 3 ) {
130	char ch_lo = ( c_lo->get_value())[1], ch_hi = ( c_hi->get_value())[1];
131
132	if ( ch_lo > ch_hi ) { char t=ch_lo; ch_lo=ch_hi; ch_hi=t; }
133
134	for ( char c = ch_lo; c <= ch_hi; c++ ) {
135	Type::Qualifiers q;
136	Constant cnst( new BasicType( q, BasicType::Char ),
137	std::string("'") + c + std::string("'") );
138	newCaseLabels.push_back( new ConstantExpr( cnst ) );
139	} // for
140
141	return;
142	} // if
143	break;
144	default:
145	// error: incompatible constants
146	break;
147	} // switch
148	break;
149	case BasicType::ShortSignedInt:
150	case BasicType::ShortUnsignedInt:
151	case BasicType::SignedInt:
152	case BasicType::UnsignedInt:
153	case BasicType::LongSignedInt:
154	case BasicType::LongUnsignedInt:
155	case BasicType::LongLongSignedInt:
156	case BasicType::LongLongUnsignedInt:
157	switch ( ty_hi->get_kind() ) {
158	case BasicType::ShortSignedInt:
159	case BasicType::ShortUnsignedInt:
160	case BasicType::SignedInt:
161	case BasicType::UnsignedInt:
162	case BasicType::LongSignedInt:
163	case BasicType::LongUnsignedInt:
164	case BasicType::LongLongSignedInt:
165	case BasicType::LongLongUnsignedInt: {
166	int i_lo = atoi( c_lo->get_value().c_str()),
167	i_hi = atoi( c_hi->get_value().c_str());
168
169	if ( i_lo > i_hi ) { int t=i_lo; i_lo=i_hi; i_hi=t; }
170
171	for ( int c = i_lo; c <= i_hi; c++ ) {
172	Type::Qualifiers q;
173	Constant cnst( new BasicType( q, ty_hi->get_kind()), // figure can't hurt (used to think in positives)
174	toString< int >( c ) );
175	newCaseLabels.push_back( new ConstantExpr( cnst ) );
176	}
177
178	return;
179	}
180	default:
181	// error: incompatible constants
182	break;
183	}
184	break;
185	default:
186	break;
187	} // switch
188
189	/* End: */{
190	// invalid range, signal a warning (it still generates the two case labels)
191	newCaseLabels.push_back( lo );
192	newCaseLabels.push_back( hi );
193	return;
194	}
195	}
196	} // namespace ControlStruct
197
198	// Local Variables: //
199	// tab-width: 4 //
200	// mode: c++ //
201	// compile-command: "make install" //
202	// End: //

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