source: src/AST/Pass.hpp@ 561354f

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1//
2// Cforall Version 1.0.0 Copyright (C) 2019 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// Pass.hpp --
8//
9// Author : Thierry Delisle
10// Created On : Thu May 09 15:37:05 2019
11// Last Modified By :
12// Last Modified On :
13// Update Count :
14//
15
16#pragma once
17// IWYU pragma: private, include "AST/Pass.hpp"
18
19#include <functional>
20#include <list>
21#include <stack>
22
23#include "AST/Fwd.hpp"
24#include "AST/Node.hpp"
25
26#include "AST/Attribute.hpp"
27#include "AST/Decl.hpp"
28#include "AST/Expr.hpp"
29#include "AST/Init.hpp"
30#include "AST/Stmt.hpp"
31#include "AST/Type.hpp"
32
33#include "AST/Visitor.hpp"
34
35#include "AST/SymbolTable.hpp"
36
37// Private prelude header, needed for some of the magic tricks this class pulls off
38#include "AST/Pass.proto.hpp"
39
40namespace ast {
41//-------------------------------------------------------------------------------------------------
42// Templated visitor type
43// To use declare a Pass< YOUR VISITOR TYPE >
44// The visitor type should specify the previsit/postvisit for types that are desired.
45// Note: previsit/postvisit must be **public** members
46//
47// Several additional features are available through inheritance
48// | PureVisitor - makes the visitor pure, it never modifies nodes in place and always
49// clones nodes it needs to make changes to
50// | WithConstTypeSubstitution - provides polymorphic const TypeSubstitution * typeSubs for the
51// current expression
52// | WithStmtsToAdd - provides the ability to insert statements before or after the current
53// statement by adding new statements into stmtsToAddBefore or
54// stmtsToAddAfter respectively.
55// | WithDeclsToAdd - provides the ability to insert declarations before or after the
56// current declarations by adding new DeclStmt into declsToAddBefore or
57// declsToAddAfter respectively.
58// | WithShortCircuiting - provides the ability to skip visiting child nodes; set visit_children
59// to false in pre{visit,visit} to skip visiting children
60// | WithGuards - provides the ability to save/restore data like a LIFO stack; to save,
61// call GuardValue with the variable to save, the variable will
62// automatically be restored to its previous value after the
63// corresponding postvisit/postmutate teminates.
64// | WithVisitorRef - provides an pointer to the templated visitor wrapper
65// | WithSymbolTable - provides symbol table functionality
66//
67// Other Special Members:
68// | beginScope - A method with no parameters or return value, called each time the
69// visitor enters a block.
70// | endScope - A method with no parameters or return value, called each time the
71// visitor leaves a block.
72// | result - Either a method that takes no parameters or a field. If a method (or
73// callable field) get_result calls it, otherwise the value is returned.
74//-------------------------------------------------------------------------------------------------
75template< typename core_t >
76class Pass final : public ast::Visitor {
77public:
78 using core_type = core_t;
79 using type = Pass<core_t>;
80
81 /// Forward any arguments to the pass constructor
82 /// Propagate 'this' if necessary
83 template< typename... Args >
84 Pass( Args &&... args)
85 : core( std::forward<Args>( args )... )
86 {
87 // After the pass is constructed, check if it wants the have a pointer to the wrapping visitor
88 type * const * visitor = __pass::visitor( core, 0 );
89 if ( visitor ) {
90 *const_cast<type **>( visitor ) = this;
91 }
92 }
93
94 virtual ~Pass() = default;
95
96 /// Storage for the actual pass.
97 core_t core;
98
99 /// If the core defines a result, call it if possible, otherwise return it.
100 inline auto get_result() -> decltype( __pass::result::get( core, '0' ) ) {
101 return __pass::result::get( core, '0' );
102 }
103
104 /// Construct and run a pass on a translation unit.
105 template< typename... Args >
106 static void run( TranslationUnit & decls, Args &&... args ) {
107 Pass<core_t> visitor( std::forward<Args>( args )... );
108 accept_all( decls, visitor );
109 }
110
111 /// Contruct and run a pass on a pointer to extract a value.
112 template< typename node_type, typename... Args >
113 static auto read( node_type const * node, Args&&... args ) {
114 Pass<core_t> visitor( std::forward<Args>( args )... );
115 auto const * temp = node->accept( visitor );
116 assert( temp == node );
117 return visitor.get_result();
118 }
119
120 // Versions of the above for older compilers.
121 template< typename... Args >
122 static void run( TranslationUnit & decls ) {
123 Pass<core_t> visitor;
124 accept_all( decls, visitor );
125 }
126
127 template< typename node_type, typename... Args >
128 static auto read( node_type const * node ) {
129 Pass<core_t> visitor;
130 auto const * temp = node->accept( visitor );
131 assert( temp == node );
132 return visitor.get_result();
133 }
134
135 /// Visit function declarations
136 const ast::DeclWithType * visit( const ast::ObjectDecl * ) override final;
137 const ast::DeclWithType * visit( const ast::FunctionDecl * ) override final;
138 const ast::Decl * visit( const ast::StructDecl * ) override final;
139 const ast::Decl * visit( const ast::UnionDecl * ) override final;
140 const ast::Decl * visit( const ast::EnumDecl * ) override final;
141 const ast::Decl * visit( const ast::AdtDecl * ) override final;
142 const ast::Decl * visit( const ast::TraitDecl * ) override final;
143 const ast::Decl * visit( const ast::TypeDecl * ) override final;
144 const ast::Decl * visit( const ast::TypedefDecl * ) override final;
145 const ast::AsmDecl * visit( const ast::AsmDecl * ) override final;
146 const ast::DirectiveDecl * visit( const ast::DirectiveDecl * ) override final;
147 const ast::StaticAssertDecl * visit( const ast::StaticAssertDecl * ) override final;
148 const ast::DeclWithType * visit( const ast::InlineMemberDecl * ) override final;
149 const ast::CompoundStmt * visit( const ast::CompoundStmt * ) override final;
150 const ast::Stmt * visit( const ast::ExprStmt * ) override final;
151 const ast::Stmt * visit( const ast::AsmStmt * ) override final;
152 const ast::Stmt * visit( const ast::DirectiveStmt * ) override final;
153 const ast::Stmt * visit( const ast::IfStmt * ) override final;
154 const ast::Stmt * visit( const ast::WhileDoStmt * ) override final;
155 const ast::Stmt * visit( const ast::ForStmt * ) override final;
156 const ast::Stmt * visit( const ast::SwitchStmt * ) override final;
157 const ast::CaseClause * visit( const ast::CaseClause * ) override final;
158 const ast::Stmt * visit( const ast::BranchStmt * ) override final;
159 const ast::Stmt * visit( const ast::ReturnStmt * ) override final;
160 const ast::Stmt * visit( const ast::ThrowStmt * ) override final;
161 const ast::Stmt * visit( const ast::TryStmt * ) override final;
162 const ast::CatchClause * visit( const ast::CatchClause * ) override final;
163 const ast::FinallyClause * visit( const ast::FinallyClause * ) override final;
164 const ast::Stmt * visit( const ast::SuspendStmt * ) override final;
165 const ast::Stmt * visit( const ast::WaitForStmt * ) override final;
166 const ast::WaitForClause * visit( const ast::WaitForClause * ) override final;
167 const ast::Decl * visit( const ast::WithStmt * ) override final;
168 const ast::NullStmt * visit( const ast::NullStmt * ) override final;
169 const ast::Stmt * visit( const ast::DeclStmt * ) override final;
170 const ast::Stmt * visit( const ast::ImplicitCtorDtorStmt * ) override final;
171 const ast::Stmt * visit( const ast::MutexStmt * ) override final;
172 const ast::Expr * visit( const ast::ApplicationExpr * ) override final;
173 const ast::Expr * visit( const ast::UntypedExpr * ) override final;
174 const ast::Expr * visit( const ast::NameExpr * ) override final;
175 const ast::Expr * visit( const ast::QualifiedNameExpr * ) override final;
176 const ast::Expr * visit( const ast::AddressExpr * ) override final;
177 const ast::Expr * visit( const ast::LabelAddressExpr * ) override final;
178 const ast::Expr * visit( const ast::CastExpr * ) override final;
179 const ast::Expr * visit( const ast::KeywordCastExpr * ) override final;
180 const ast::Expr * visit( const ast::VirtualCastExpr * ) override final;
181 const ast::Expr * visit( const ast::UntypedMemberExpr * ) override final;
182 const ast::Expr * visit( const ast::MemberExpr * ) override final;
183 const ast::Expr * visit( const ast::VariableExpr * ) override final;
184 const ast::Expr * visit( const ast::ConstantExpr * ) override final;
185 const ast::Expr * visit( const ast::SizeofExpr * ) override final;
186 const ast::Expr * visit( const ast::AlignofExpr * ) override final;
187 const ast::Expr * visit( const ast::UntypedOffsetofExpr * ) override final;
188 const ast::Expr * visit( const ast::OffsetofExpr * ) override final;
189 const ast::Expr * visit( const ast::OffsetPackExpr * ) override final;
190 const ast::Expr * visit( const ast::LogicalExpr * ) override final;
191 const ast::Expr * visit( const ast::ConditionalExpr * ) override final;
192 const ast::Expr * visit( const ast::CommaExpr * ) override final;
193 const ast::Expr * visit( const ast::TypeExpr * ) override final;
194 const ast::Expr * visit( const ast::DimensionExpr * ) override final;
195 const ast::Expr * visit( const ast::AsmExpr * ) override final;
196 const ast::Expr * visit( const ast::ImplicitCopyCtorExpr * ) override final;
197 const ast::Expr * visit( const ast::ConstructorExpr * ) override final;
198 const ast::Expr * visit( const ast::CompoundLiteralExpr * ) override final;
199 const ast::Expr * visit( const ast::RangeExpr * ) override final;
200 const ast::Expr * visit( const ast::UntypedTupleExpr * ) override final;
201 const ast::Expr * visit( const ast::TupleExpr * ) override final;
202 const ast::Expr * visit( const ast::TupleIndexExpr * ) override final;
203 const ast::Expr * visit( const ast::TupleAssignExpr * ) override final;
204 const ast::Expr * visit( const ast::StmtExpr * ) override final;
205 const ast::Expr * visit( const ast::UniqueExpr * ) override final;
206 const ast::Expr * visit( const ast::UntypedInitExpr * ) override final;
207 const ast::Expr * visit( const ast::InitExpr * ) override final;
208 const ast::Expr * visit( const ast::DeletedExpr * ) override final;
209 const ast::Expr * visit( const ast::DefaultArgExpr * ) override final;
210 const ast::Expr * visit( const ast::GenericExpr * ) override final;
211 const ast::Type * visit( const ast::VoidType * ) override final;
212 const ast::Type * visit( const ast::BasicType * ) override final;
213 const ast::Type * visit( const ast::PointerType * ) override final;
214 const ast::Type * visit( const ast::ArrayType * ) override final;
215 const ast::Type * visit( const ast::ReferenceType * ) override final;
216 const ast::Type * visit( const ast::QualifiedType * ) override final;
217 const ast::Type * visit( const ast::FunctionType * ) override final;
218 const ast::Type * visit( const ast::StructInstType * ) override final;
219 const ast::Type * visit( const ast::UnionInstType * ) override final;
220 const ast::Type * visit( const ast::EnumInstType * ) override final;
221 const ast::Type * visit( const ast::TraitInstType * ) override final;
222 const ast::Type * visit( const ast::TypeInstType * ) override final;
223 const ast::Type * visit( const ast::TupleType * ) override final;
224 const ast::Type * visit( const ast::TypeofType * ) override final;
225 const ast::Type * visit( const ast::VTableType * ) override final;
226 const ast::Type * visit( const ast::VarArgsType * ) override final;
227 const ast::Type * visit( const ast::ZeroType * ) override final;
228 const ast::Type * visit( const ast::OneType * ) override final;
229 const ast::Type * visit( const ast::GlobalScopeType * ) override final;
230 const ast::Designation * visit( const ast::Designation * ) override final;
231 const ast::Init * visit( const ast::SingleInit * ) override final;
232 const ast::Init * visit( const ast::ListInit * ) override final;
233 const ast::Init * visit( const ast::ConstructorInit * ) override final;
234 const ast::Attribute * visit( const ast::Attribute * ) override final;
235 const ast::TypeSubstitution * visit( const ast::TypeSubstitution * ) override final;
236
237 template<typename core_type>
238 friend void accept_all( std::list< ptr<Decl> > & decls, Pass<core_type>& visitor );
239
240 bool isInFunction() const {
241 return inFunction;
242 }
243
244private:
245
246 bool __visit_children() { __pass::bool_ref * ptr = __pass::visit_children(core, 0); return ptr ? *ptr : true; }
247
248private:
249
250 __pass::result1<ast::Stmt> call_accept( const ast::Stmt * );
251 __pass::result1<ast::Expr> call_accept( const ast::Expr * );
252
253 /// This has a `type` member that is the return type for the
254 /// generic call_accept if the generic call_accept is defined.
255 template< typename node_t >
256 using generic_call_accept_result =
257 std::enable_if<
258 !std::is_base_of<ast::Expr, node_t>::value &&
259 !std::is_base_of<ast::Stmt, node_t>::value
260 , __pass::result1<
261 typename std::remove_pointer< typename std::result_of<
262 decltype(&node_t::accept)(node_t*, type&) >::type >::type
263 >
264 >;
265
266 template< typename node_t >
267 auto call_accept( const node_t * node )
268 -> typename generic_call_accept_result<node_t>::type;
269
270 // requests WithStmtsToAdd directly add to this statement, as if it is a compound.
271 __pass::result1<ast::Stmt> call_accept_as_compound(const ast::Stmt *);
272
273 // requests type environment to be updated (why is it implemented like this?)
274 __pass::result1<ast::Expr> call_accept_top(const ast::Expr *);
275
276 template< template <class...> class container_t >
277 __pass::resultNstmt<container_t> call_accept( const container_t< ptr<Stmt> > & );
278
279 template< template <class...> class container_t, typename node_t >
280 __pass::resultN< container_t, node_t > call_accept( const container_t< ptr<node_t> > & container );
281
282public:
283 /// Logic to call the accept and mutate the parent if needed, delegates call to accept
284 template<typename node_t, typename parent_t, typename field_t>
285 void maybe_accept(const node_t * &, field_t parent_t::* field);
286
287 template<typename node_t, typename parent_t, typename field_t>
288 void maybe_accept_as_compound(const node_t * &, field_t parent_t::* field);
289
290 template<typename node_t, typename parent_t, typename field_t>
291 void maybe_accept_top(const node_t * &, field_t parent_t::* field);
292
293private:
294 /// Internal RAII guard for symbol table features
295 struct guard_symtab {
296 guard_symtab( Pass<core_t> & pass ): pass( pass ) { __pass::symtab::enter(pass.core, 0); }
297 ~guard_symtab() { __pass::symtab::leave(pass.core, 0); }
298 Pass<core_t> & pass;
299 };
300
301 /// Internal RAII guard for scope features
302 struct guard_scope {
303 guard_scope( Pass<core_t> & pass ): pass( pass ) { __pass::scope::enter(pass.core, 0); }
304 ~guard_scope() { __pass::scope::leave(pass.core, 0); }
305 Pass<core_t> & pass;
306 };
307
308 /// Internal RAII guard for forall substitutions
309 struct guard_forall_subs {
310 guard_forall_subs( Pass<core_t> & pass, const FunctionType * type )
311 : pass( pass ), type( type ) { __pass::forall::enter(pass.core, 0, type ); }
312 ~guard_forall_subs() { __pass::forall::leave(pass.core, 0, type ); }
313 Pass<core_t> & pass;
314 const FunctionType * type;
315 };
316
317private:
318 bool inFunction = false;
319 bool atFunctionTop = false;
320};
321
322/// Apply a pass to an entire translation unit
323template<typename core_t>
324void accept_all( std::list< ast::ptr<ast::Decl> > &, ast::Pass<core_t> & visitor );
325
326template<typename core_t>
327void accept_all( ast::TranslationUnit &, ast::Pass<core_t> & visitor );
328
329//-------------------------------------------------------------------------------------------------
330// PASS ACCESSORIES
331//-------------------------------------------------------------------------------------------------
332
333/// If used the visitor will always clone nodes.
334struct PureVisitor {};
335
336/// Keep track of the nearest parent node's location field.
337struct WithCodeLocation {
338 const CodeLocation * location = nullptr;
339};
340
341/// Keep track of the polymorphic const TypeSubstitution * typeSubs for the current expression.
342struct WithConstTypeSubstitution {
343 const TypeSubstitution * typeSubs = nullptr;
344};
345
346/// Used if visitor requires added statements before or after the current node.
347/// The Pass template handles what *before* and *after* means automatically
348template< template<class...> class container_t = std::list >
349struct WithStmtsToAdd {
350 container_t< ptr<Stmt> > stmtsToAddBefore;
351 container_t< ptr<Stmt> > stmtsToAddAfter;
352};
353
354/// Used if visitor requires added declarations before or after the current node.
355/// The Pass template handles what *before* and *after* means automatically
356template< template<class...> class container_t = std::list >
357struct WithDeclsToAdd {
358 container_t< ptr<Decl> > declsToAddBefore;
359 container_t< ptr<Decl> > declsToAddAfter;
360};
361
362/// Use if visitation should stop at certain levels
363/// set visit_children false of all child nodes should be ignored
364struct WithShortCircuiting {
365 __pass::bool_ref visit_children;
366};
367
368/// Used to restore values/functions/etc. when the Pass finishes visiting this node
369class WithGuards {
370 __pass::at_cleanup_t at_cleanup = [](__pass::cleanup_func_t, void*) {
371 std::cerr << "No cleanup function was set" << std::endl;
372 abort();
373 };
374
375 template< typename core_t>
376 friend auto __pass::at_cleanup( core_t & core, int ) -> decltype( &core.at_cleanup );
377public:
378
379 /// When this node is finished being visited, restore the value of a variable
380 /// You may assign to the return value to set the new value in the same statement.
381 template< typename T >
382 T& GuardValue( T& val ) {
383 at_cleanup( [ val ]( void * newVal ) {
384 * static_cast< T * >( newVal ) = val;
385 }, static_cast< void * >( & val ) );
386 return val;
387 }
388
389 /// On the object, all beginScope now and endScope when the current node is finished being visited
390 template< typename T >
391 void GuardScope( T& val ) {
392 val.beginScope();
393 at_cleanup( []( void * val ) {
394 static_cast< T * >( val )->endScope();
395 }, static_cast< void * >( & val ) );
396 }
397
398 /// When this node is finished being visited, call a function
399 template< typename Func >
400 void GuardAction( Func func ) {
401 at_cleanup( [func](void *) { func(); }, nullptr );
402 }
403};
404
405/// Used to get a pointer to the pass with its wrapped type
406template<typename core_t>
407struct WithVisitorRef {
408 Pass<core_t> * const visitor = nullptr;
409
410 bool isInFunction() const {
411 return visitor->isInFunction();
412 }
413};
414
415/// Use when the templated visitor should update the symbol table
416struct WithSymbolTable {
417 SymbolTable symtab;
418};
419
420/// Used to get a pointer to the wrapping TranslationUnit.
421struct WithConstTranslationUnit {
422 const TranslationUnit * translationUnit = nullptr;
423
424 const TranslationUnit & transUnit() const {
425 assertf( translationUnit, "WithConstTranslationUnit not set-up." );
426 return *translationUnit;
427 }
428};
429
430}
431
432#include "Common/Stats.h"
433
434namespace ast {
435extern struct PassVisitorStats {
436 size_t depth = 0;
437 Stats::Counters::MaxCounter<double> * max;
438 Stats::Counters::AverageCounter<double> * avg;
439} pass_visitor_stats;
440}
441
442#include "AST/Pass.impl.hpp"
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