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source: src/AST/Pass.proto.hpp @ 2bb4a01

ADTarm-ehast-experimentalcleanup-dtorsenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since 2bb4a01 was f47f887, checked in by Thierry Delisle <tdelisle@…>, 5 years ago
First draft of Pass.hpp and some updates to node.hpp
Property mode set to `100644`
File size: 10.5 KB

Line
1	#pragma once
2	// IWYU pragma: private, include "Pass.hpp"
3
4	namespace ast {
5	template<typename pass_type>
6	class Pass;
7
8	namespace __pass {
9	typedef std::function<void( void * )> cleanup_func_t;
10	typedef std::function<void( cleanup_func_t, void * )> at_cleanup_t;
11
12
13	// boolean reference that may be null
14	// either refers to a boolean value or is null and returns true
15	class bool_ref {
16	public:
17	bool_ref() = default;
18	~bool_ref() = default;
19
20	operator bool() { return m_ref ? *m_ref : true; }
21	bool operator=( bool val ) { assert(m_ref); return *m_ref = val; }
22
23	private:
24
25	friend class visit_children_guard;
26
27	bool * set( bool * val ) {
28	bool * prev = m_ref;
29	m_ref = val;
30	return prev;
31	}
32
33	bool * m_ref = nullptr;
34	};
35
36	// Implementation of the guard value
37	// Created inside the visit scope
38	class guard_value {
39	public:
40	guard_value( at_cleanup_t * at_cleanup ) {
41	if( at_cleanup ) {
42	at_cleanup = [this]( cleanup_func_t && func, void val ) {
43	push( std::move( func ), val );
44	};
45	}
46	}
47
48	~guard_value() {
49	while( !cleanups.empty() ) {
50	auto& cleanup = cleanups.top();
51	cleanup.func( cleanup.val );
52	cleanups.pop();
53	}
54	}
55
56	void push( cleanup_func_t && func, void* val ) {
57	cleanups.emplace( std::move(func), val );
58	}
59
60	private:
61	struct cleanup_t {
62	cleanup_func_t func;
63	void * val;
64
65	cleanup_t( cleanup_func_t&& func, void * val ) : func(func), val(val) {}
66	};
67
68	std::stack< cleanup_t > cleanups;
69	};
70
71	// Guard structure implementation for whether or not children should be visited
72	class visit_children_guard {
73	public:
74
75	visit_children_guard( bool_ref * ref )
76	: m_val ( true )
77	, m_prev( ref ? ref->set( &m_val ) : nullptr )
78	, m_ref ( ref )
79	{}
80
81	~visit_children_guard() {
82	if( m_ref ) {
83	m_ref->set( m_prev );
84	}
85	}
86
87	operator bool() { return m_val; }
88
89	private:
90	bool m_val;
91	bool * m_prev;
92	bool_ref * m_ref;
93	};
94
95	//-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
96	// Deep magic (a.k.a template meta programming) to make the templated visitor work
97	// Basically the goal is to make 2 previsit
98	// 1 - Use when a pass implements a valid previsit. This uses overloading which means the any overload of
99	// 'pass.previsit( node )' that compiles will be used for that node for that type
100	// This requires that this option only compile for passes that actually define an appropriate visit.
101	// SFINAE will make sure the compilation errors in this function don't halt the build.
102	// See http://en.cppreference.com/w/cpp/language/sfinae for details on SFINAE
103	// 2 - Since the first implementation might not be specilizable, the second implementation exists and does nothing.
104	// This is needed only to eliminate the need for passes to specify any kind of handlers.
105	// The second implementation only works because it has a lower priority. This is due to the bogus last parameter.
106	// The second implementation takes a long while the first takes an int. Since the caller always passes an literal 0
107	// the first implementation takes priority in regards to overloading.
108	//-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
109	// PreVisit : may mutate the pointer passed in if the node is mutated in the previsit call
110	template<typename pass_t, typename node_t>
111	static inline auto previsit( pass_t & pass, const node_t * & node, int ) -> decltype( pass.previsit( node ), void() ) {
112	node = pass.previsit( node );
113	assert(node);
114	}
115
116	template<typename pass_t, typename node_t>
117	static inline auto previsit( pass_t &, const node_t *, long ) {}
118
119	// PostVisit : never mutates the passed pointer but may return a different node
120	template<typename pass_t, typename node_t>
121	static inline auto postvisit( pass_t & pass, const node_t * node, int ) -> decltype( pass.postvisit( node ), (const node_t *)nullptr ) {
122	return pass.postvisit( node );
123	}
124
125	template<typename pass_t, typename node_t>
126	static inline const node_t * postvisit( pass_t &, const node_t * node, long ) { return node; }
127
128	//-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
129	// Deep magic (a.k.a template meta programming) continued
130	// To make the templated visitor be more expressive, we allow 'accessories' : classes/structs the implementation can inherit
131	// from in order to get extra functionallity for example
132	// class ErrorChecker : WithShortCircuiting { ... };
133	// Pass<ErrorChecker> checker;
134	// this would define a pass that uses the templated visitor with the additionnal feature that it has short circuiting
135	// Note that in all cases the accessories are not required but guarantee the requirements of the feature is matched
136	//-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
137	// For several accessories, the feature is enabled by detecting that a specific field is present
138	// Use a macro the encapsulate the logic of detecting a particular field
139	// The type is not strictly enforced but does match the accessory
140	#define FIELD_PTR( name, default_type ) \
141	template< typename pass_t > \
142	static inline auto name( pass_t & pass, int ) -> decltype( &pass.name ) { return &pass.name; } \
143	\
144	template< typename pass_t > \
145	static inline default_type * name( pass_t &, long ) { return nullptr; }
146
147	// List of fields and their expected types
148	FIELD_PTR( env, const ast::TypeSubstitution )
149	FIELD_PTR( stmtsToAddBefore, std::list< ast::ptr< ast::Stmt > > )
150	FIELD_PTR( stmtsToAddAfter , std::list< ast::ptr< ast::Stmt > > )
151	FIELD_PTR( declsToAddBefore, std::list< ast::ptr< ast::Decl > > )
152	FIELD_PTR( declsToAddAfter , std::list< ast::ptr< ast::Decl > > )
153	FIELD_PTR( visit_children, __pass::bool_ref )
154	FIELD_PTR( at_cleanup, __pass::at_cleanup_t )
155	FIELD_PTR( visitor, ast::Pass<pass_t> * const )
156
157	// Remove the macro to make sure we don't clash
158	#undef FIELD_PTR
159
160	// Another feature of the templated visitor is that it calls beginScope()/endScope() for compound statement.
161	// All passes which have such functions are assumed desire this behaviour
162	// detect it using the same strategy
163	namespace scope {
164	template<typename pass_t>
165	static inline auto enter( pass_t & pass, int ) -> decltype( pass.beginScope(), void() ) {
166	pass.beginScope();
167	}
168
169	template<typename pass_t>
170	static inline void enter( pass_t &, long ) {}
171
172	template<typename pass_t>
173	static inline auto leave( pass_t & pass, int ) -> decltype( pass.endScope(), void() ) {
174	pass.endScope();
175	}
176
177	template<typename pass_t>
178	static inline void leave( pass_t &, long ) {}
179	};
180
181	// Finally certain pass desire an up to date indexer automatically
182	// detect the presence of a member name indexer and call all the members appropriately
183	namespace indexer {
184	// Some simple scoping rules
185	template<typename pass_t>
186	static inline auto enter( pass_t & pass, int ) -> decltype( pass.indexer.enterScope(), void() ) {
187	pass.indexer.enterScope();
188	}
189
190	template<typename pass_t>
191	static inline auto enter( pass_t &, long ) {}
192
193	template<typename pass_t>
194	static inline auto leave( pass_t & pass, int ) -> decltype( pass.indexer.leaveScope(), void() ) {
195	pass.indexer.leaveScope();
196	}
197
198	template<typename pass_t>
199	static inline auto leave( pass_t &, long ) {}
200
201	// The indexer has 2 kind of functions mostly, 1 argument and 2 arguments
202	// Create macro to condense these common patterns
203	#define INDEXER_FUNC1( func, type ) \
204	template<typename pass_t> \
205	static inline auto func( pass_t & pass, int, type arg ) -> decltype( pass.indexer.func( arg ), void() ) {\
206	pass.indexer.func( arg ); \
207	} \
208	\
209	template<typename pass_t> \
210	static inline void func( pass_t &, long, type ) {}
211
212	#define INDEXER_FUNC2( func, type1, type2 ) \
213	template<typename pass_t> \
214	static inline auto func( pass_t & pass, int, type1 arg1, type2 arg2 ) -> decltype( pass.indexer.func( arg1, arg2 ), void () ) {\
215	pass.indexer.func( arg1, arg2 ); \
216	} \
217	\
218	template<typename pass_t> \
219	static inline void func( pass_t &, long, type1, type2 ) {}
220
221	INDEXER_FUNC1( addId , DeclarationWithType * );
222	INDEXER_FUNC1( addType , NamedTypeDecl * );
223	INDEXER_FUNC1( addStruct , StructDecl * );
224	INDEXER_FUNC1( addEnum , EnumDecl * );
225	INDEXER_FUNC1( addUnion , UnionDecl * );
226	INDEXER_FUNC1( addTrait , TraitDecl * );
227	INDEXER_FUNC2( addWith , std::list< Expression * > &, BaseSyntaxNode * );
228
229	// A few extra functions have more complicated behaviour, they are hand written
230	template<typename pass_t>
231	static inline auto addStructFwd( pass_t & pass, int, ast::StructDecl * decl ) -> decltype( pass.indexer.addStruct( decl ), void() ) {
232	ast::StructDecl * fwd = new ast::StructDecl( decl->location, decl->name );
233	fwd->parameters = decl->parameters;
234	pass.indexer.addStruct( fwd );
235	}
236
237	template<typename pass_t>
238	static inline void addStructFwd( pass_t &, long, ast::StructDecl * ) {}
239
240	template<typename pass_t>
241	static inline auto addUnionFwd( pass_t & pass, int, ast::UnionDecl * decl ) -> decltype( pass.indexer.addUnion( decl ), void() ) {
242	UnionDecl * fwd = new UnionDecl( decl->name );
243	fwd->parameters = decl->parameters;
244	pass.indexer.addUnion( fwd );
245	}
246
247	template<typename pass_t>
248	static inline void addUnionFwd( pass_t &, long, ast::UnionDecl * ) {}
249
250	template<typename pass_t>
251	static inline auto addStruct( pass_t & pass, int, const std::string & str ) -> decltype( pass.indexer.addStruct( str ), void() ) {
252	if ( ! pass.indexer.lookupStruct( str ) ) {
253	pass.indexer.addStruct( str );
254	}
255	}
256
257	template<typename pass_t>
258	static inline void addStruct( pass_t &, long, const std::string & ) {}
259
260	template<typename pass_t>
261	static inline auto addUnion( pass_t & pass, int, const std::string & str ) -> decltype( pass.indexer.addUnion( str ), void() ) {
262	if ( ! pass.indexer.lookupUnion( str ) ) {
263	pass.indexer.addUnion( str );
264	}
265	}
266
267	template<typename pass_t>
268	static inline void addUnion( pass_t &, long, const std::string & ) {}
269
270	#undef INDEXER_FUNC1
271	#undef INDEXER_FUNC2
272	};
273	};
274	};

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