source: src/AST/Pass.hpp@ f5212ca

Last change on this file since f5212ca was 0522ebe, checked in by JiadaL <j82liang@…>, 19 months ago

Add EnumPosType to type system
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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::TraitDecl * ) override final;
142 const ast::Decl * visit( const ast::TypeDecl * ) override final;
143 const ast::Decl * visit( const ast::TypedefDecl * ) override final;
144 const ast::AsmDecl * visit( const ast::AsmDecl * ) override final;
145 const ast::DirectiveDecl * visit( const ast::DirectiveDecl * ) override final;
146 const ast::StaticAssertDecl * visit( const ast::StaticAssertDecl * ) override final;
147 const ast::DeclWithType * visit( const ast::InlineMemberDecl * ) override final;
148 const ast::CompoundStmt * visit( const ast::CompoundStmt * ) override final;
149 const ast::Stmt * visit( const ast::ExprStmt * ) override final;
150 const ast::Stmt * visit( const ast::AsmStmt * ) override final;
151 const ast::Stmt * visit( const ast::DirectiveStmt * ) override final;
152 const ast::Stmt * visit( const ast::IfStmt * ) override final;
153 const ast::Stmt * visit( const ast::WhileDoStmt * ) override final;
154 const ast::Stmt * visit( const ast::ForStmt * ) override final;
155 const ast::Stmt * visit( const ast::SwitchStmt * ) override final;
156 const ast::CaseClause * visit( const ast::CaseClause * ) override final;
157 const ast::Stmt * visit( const ast::BranchStmt * ) override final;
158 const ast::Stmt * visit( const ast::ReturnStmt * ) override final;
159 const ast::Stmt * visit( const ast::ThrowStmt * ) override final;
160 const ast::Stmt * visit( const ast::TryStmt * ) override final;
161 const ast::CatchClause * visit( const ast::CatchClause * ) override final;
162 const ast::FinallyClause * visit( const ast::FinallyClause * ) override final;
163 const ast::Stmt * visit( const ast::SuspendStmt * ) override final;
164 const ast::WhenClause * visit( const ast::WhenClause * ) 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::Stmt * visit( const ast::WaitUntilStmt * ) override final;
168 const ast::Decl * visit( const ast::WithStmt * ) override final;
169 const ast::NullStmt * visit( const ast::NullStmt * ) override final;
170 const ast::Stmt * visit( const ast::DeclStmt * ) override final;
171 const ast::Stmt * visit( const ast::ImplicitCtorDtorStmt * ) override final;
172 const ast::Stmt * visit( const ast::MutexStmt * ) override final;
173 const ast::Stmt * visit( const ast::CorunStmt * ) override final;
174 const ast::Stmt * visit( const ast::CoforStmt * ) override final;
175 const ast::Expr * visit( const ast::ApplicationExpr * ) override final;
176 const ast::Expr * visit( const ast::UntypedExpr * ) override final;
177 const ast::Expr * visit( const ast::NameExpr * ) override final;
178 const ast::Expr * visit( const ast::QualifiedNameExpr * ) override final;
179 const ast::Expr * visit( const ast::AddressExpr * ) override final;
180 const ast::Expr * visit( const ast::LabelAddressExpr * ) override final;
181 const ast::Expr * visit( const ast::CastExpr * ) override final;
182 const ast::Expr * visit( const ast::KeywordCastExpr * ) override final;
183 const ast::Expr * visit( const ast::VirtualCastExpr * ) override final;
184 const ast::Expr * visit( const ast::UntypedMemberExpr * ) override final;
185 const ast::Expr * visit( const ast::MemberExpr * ) override final;
186 const ast::Expr * visit( const ast::VariableExpr * ) override final;
187 const ast::Expr * visit( const ast::ConstantExpr * ) override final;
188 const ast::Expr * visit( const ast::SizeofExpr * ) override final;
189 const ast::Expr * visit( const ast::AlignofExpr * ) override final;
190 const ast::Expr * visit( const ast::UntypedOffsetofExpr * ) override final;
191 const ast::Expr * visit( const ast::OffsetofExpr * ) override final;
192 const ast::Expr * visit( const ast::OffsetPackExpr * ) override final;
193 const ast::Expr * visit( const ast::LogicalExpr * ) override final;
194 const ast::Expr * visit( const ast::ConditionalExpr * ) override final;
195 const ast::Expr * visit( const ast::CommaExpr * ) override final;
196 const ast::Expr * visit( const ast::TypeExpr * ) override final;
197 const ast::Expr * visit( const ast::DimensionExpr * ) override final;
198 const ast::Expr * visit( const ast::AsmExpr * ) override final;
199 const ast::Expr * visit( const ast::ImplicitCopyCtorExpr * ) override final;
200 const ast::Expr * visit( const ast::ConstructorExpr * ) override final;
201 const ast::Expr * visit( const ast::CompoundLiteralExpr * ) override final;
202 const ast::Expr * visit( const ast::RangeExpr * ) override final;
203 const ast::Expr * visit( const ast::UntypedTupleExpr * ) override final;
204 const ast::Expr * visit( const ast::TupleExpr * ) override final;
205 const ast::Expr * visit( const ast::TupleIndexExpr * ) override final;
206 const ast::Expr * visit( const ast::TupleAssignExpr * ) override final;
207 const ast::Expr * visit( const ast::StmtExpr * ) override final;
208 const ast::Expr * visit( const ast::UniqueExpr * ) override final;
209 const ast::Expr * visit( const ast::UntypedInitExpr * ) override final;
210 const ast::Expr * visit( const ast::InitExpr * ) override final;
211 const ast::Expr * visit( const ast::DeletedExpr * ) override final;
212 const ast::Expr * visit( const ast::DefaultArgExpr * ) override final;
213 const ast::Expr * visit( const ast::GenericExpr * ) override final;
214 const ast::Type * visit( const ast::VoidType * ) override final;
215 const ast::Type * visit( const ast::BasicType * ) override final;
216 const ast::Type * visit( const ast::PointerType * ) override final;
217 const ast::Type * visit( const ast::ArrayType * ) override final;
218 const ast::Type * visit( const ast::ReferenceType * ) override final;
219 const ast::Type * visit( const ast::QualifiedType * ) override final;
220 const ast::Type * visit( const ast::FunctionType * ) override final;
221 const ast::Type * visit( const ast::StructInstType * ) override final;
222 const ast::Type * visit( const ast::UnionInstType * ) override final;
223 const ast::Type * visit( const ast::EnumInstType * ) override final;
224 const ast::Type * visit( const ast::EnumPosType * ) override final;
225 const ast::Type * visit( const ast::TraitInstType * ) override final;
226 const ast::Type * visit( const ast::TypeInstType * ) override final;
227 const ast::Type * visit( const ast::TupleType * ) override final;
228 const ast::Type * visit( const ast::TypeofType * ) override final;
229 const ast::Type * visit( const ast::VTableType * ) override final;
230 const ast::Type * visit( const ast::VarArgsType * ) override final;
231 const ast::Type * visit( const ast::ZeroType * ) override final;
232 const ast::Type * visit( const ast::OneType * ) override final;
233 const ast::Type * visit( const ast::GlobalScopeType * ) override final;
234 const ast::Designation * visit( const ast::Designation * ) override final;
235 const ast::Init * visit( const ast::SingleInit * ) override final;
236 const ast::Init * visit( const ast::ListInit * ) override final;
237 const ast::Init * visit( const ast::ConstructorInit * ) override final;
238 const ast::Attribute * visit( const ast::Attribute * ) override final;
239 const ast::TypeSubstitution * visit( const ast::TypeSubstitution * ) override final;
240
241 template<typename core_type>
242 friend void accept_all( std::list< ptr<Decl> > & decls, Pass<core_type>& visitor );
243
244 bool isInFunction() const {
245 return inFunction;
246 }
247
248private:
249
250 bool __visit_children() { __pass::bool_ref * ptr = __pass::visit_children(core, 0); return ptr ? *ptr : true; }
251
252private:
253
254 __pass::result1<ast::Stmt> call_accept( const ast::Stmt * );
255 __pass::result1<ast::Expr> call_accept( const ast::Expr * );
256
257 /// This has a `type` member that is the return type for the
258 /// generic call_accept if the generic call_accept is defined.
259 template< typename node_t >
260 using generic_call_accept_result =
261 std::enable_if<
262 !std::is_base_of<ast::Expr, node_t>::value &&
263 !std::is_base_of<ast::Stmt, node_t>::value
264 , __pass::result1<
265 typename std::remove_pointer< typename std::result_of<
266 decltype(&node_t::accept)(node_t*, type&) >::type >::type
267 >
268 >;
269
270 template< typename node_t >
271 auto call_accept( const node_t * node )
272 -> typename generic_call_accept_result<node_t>::type;
273
274 // requests WithStmtsToAdd directly add to this statement, as if it is a compound.
275 __pass::result1<ast::Stmt> call_accept_as_compound(const ast::Stmt *);
276
277 // requests type environment to be updated (why is it implemented like this?)
278 __pass::result1<ast::Expr> call_accept_top(const ast::Expr *);
279
280 template< template <class...> class container_t >
281 __pass::resultNstmt<container_t> call_accept( const container_t< ptr<Stmt> > & );
282
283 template< template <class...> class container_t, typename node_t >
284 __pass::resultN< container_t, node_t > call_accept( const container_t< ptr<node_t> > & container );
285
286public:
287 /// Logic to call the accept and mutate the parent if needed, delegates call to accept
288 template<typename node_t, typename parent_t, typename field_t>
289 void maybe_accept(const node_t * &, field_t parent_t::* field);
290
291 template<typename node_t, typename parent_t, typename field_t>
292 void maybe_accept_as_compound(const node_t * &, field_t parent_t::* field);
293
294 template<typename node_t, typename parent_t, typename field_t>
295 void maybe_accept_top(const node_t * &, field_t parent_t::* field);
296
297private:
298 /// Internal RAII guard for symbol table features
299 struct guard_symtab {
300 guard_symtab( Pass<core_t> & pass ): pass( pass ) { __pass::symtab::enter(pass.core, 0); }
301 ~guard_symtab() { __pass::symtab::leave(pass.core, 0); }
302 Pass<core_t> & pass;
303 };
304
305 /// Internal RAII guard for scope features
306 struct guard_scope {
307 guard_scope( Pass<core_t> & pass ): pass( pass ) { __pass::scope::enter(pass.core, 0); }
308 ~guard_scope() { __pass::scope::leave(pass.core, 0); }
309 Pass<core_t> & pass;
310 };
311
312 /// Internal RAII guard for forall substitutions
313 struct guard_forall_subs {
314 guard_forall_subs( Pass<core_t> & pass, const FunctionType * type )
315 : pass( pass ), type( type ) { __pass::forall::enter(pass.core, 0, type ); }
316 ~guard_forall_subs() { __pass::forall::leave(pass.core, 0, type ); }
317 Pass<core_t> & pass;
318 const FunctionType * type;
319 };
320
321private:
322 bool inFunction = false;
323 bool atFunctionTop = false;
324};
325
326/// Apply a pass to an entire translation unit
327template<typename core_t>
328void accept_all( std::list< ast::ptr<ast::Decl> > &, ast::Pass<core_t> & visitor );
329
330template<typename core_t>
331void accept_all( ast::TranslationUnit &, ast::Pass<core_t> & visitor );
332
333//-------------------------------------------------------------------------------------------------
334// PASS ACCESSORIES
335//-------------------------------------------------------------------------------------------------
336
337/// If used the visitor will always clone nodes.
338struct PureVisitor {};
339
340/// Keep track of the nearest parent node's location field.
341struct WithCodeLocation {
342 const CodeLocation * location = nullptr;
343};
344
345/// Keep track of the polymorphic const TypeSubstitution * typeSubs for the current expression.
346struct WithConstTypeSubstitution {
347 const TypeSubstitution * typeSubs = nullptr;
348};
349
350/// Used if visitor requires added statements before or after the current node.
351/// The Pass template handles what *before* and *after* means automatically
352template< template<class...> class container_t = std::list >
353struct WithStmtsToAdd {
354 container_t< ptr<Stmt> > stmtsToAddBefore;
355 container_t< ptr<Stmt> > stmtsToAddAfter;
356};
357
358/// Used if visitor requires added declarations before or after the current node.
359/// The Pass template handles what *before* and *after* means automatically
360template< template<class...> class container_t = std::list >
361struct WithDeclsToAdd {
362 container_t< ptr<Decl> > declsToAddBefore;
363 container_t< ptr<Decl> > declsToAddAfter;
364};
365
366/// Use if visitation should stop at certain levels
367/// set visit_children false of all child nodes should be ignored
368struct WithShortCircuiting {
369 __pass::bool_ref visit_children;
370};
371
372/// Used to restore values/functions/etc. when the Pass finishes visiting this node
373class WithGuards {
374 __pass::at_cleanup_t at_cleanup = [](__pass::cleanup_func_t, void*) {
375 std::cerr << "No cleanup function was set" << std::endl;
376 abort();
377 };
378
379 template< typename core_t>
380 friend auto __pass::at_cleanup( core_t & core, int ) -> decltype( &core.at_cleanup );
381public:
382
383 /// When this node is finished being visited, restore the value of a variable
384 /// You may assign to the return value to set the new value in the same statement.
385 template< typename T >
386 T& GuardValue( T& val ) {
387 at_cleanup( [ val ]( void * newVal ) {
388 * static_cast< T * >( newVal ) = val;
389 }, static_cast< void * >( & val ) );
390 return val;
391 }
392
393 /// On the object, all beginScope now and endScope when the current node is finished being visited
394 template< typename T >
395 void GuardScope( T& val ) {
396 val.beginScope();
397 at_cleanup( []( void * val ) {
398 static_cast< T * >( val )->endScope();
399 }, static_cast< void * >( & val ) );
400 }
401
402 /// When this node is finished being visited, call a function
403 template< typename Func >
404 void GuardAction( Func func ) {
405 at_cleanup( [func](void *) { func(); }, nullptr );
406 }
407};
408
409/// Used to get a pointer to the pass with its wrapped type
410template<typename core_t>
411struct WithVisitorRef {
412 Pass<core_t> * const visitor = nullptr;
413
414 bool isInFunction() const {
415 return visitor->isInFunction();
416 }
417};
418
419/// Use when the templated visitor should update the symbol table,
420/// that is, when your pass core needs to query the symbol table.
421/// Expected setups:
422/// - For master passes that kick off at the compilation unit
423/// - before resolver: extend WithSymbolTableX<IgnoreErrors>
424/// - after resolver: extend WithSymbolTable and use defaults
425/// - (FYI, for completeness, the resolver's main pass uses ValidateOnAdd when it kicks off)
426/// - For helper passes that kick off at arbitrary points in the AST:
427/// - take an existing symbol table as a parameter, extend WithSymbolTable,
428/// and construct with WithSymbolTable(const SymbolTable &)
429struct WithSymbolTable {
430 WithSymbolTable(const ast::SymbolTable & from) : symtab(from) {}
431 WithSymbolTable(ast::SymbolTable::ErrorDetection errorMode = ast::SymbolTable::ErrorDetection::AssertClean) : symtab(errorMode) {}
432 ast::SymbolTable symtab;
433};
434template <ast::SymbolTable::ErrorDetection errorMode>
435struct WithSymbolTableX : WithSymbolTable {
436 WithSymbolTableX() : WithSymbolTable(errorMode) {}
437};
438
439/// Used to get a pointer to the wrapping TranslationUnit.
440struct WithConstTranslationUnit {
441 const TranslationUnit * translationUnit = nullptr;
442
443 const TranslationUnit & transUnit() const {
444 assertf( translationUnit, "WithConstTranslationUnit not set-up." );
445 return *translationUnit;
446 }
447};
448
449}
450
451#include "Common/Stats.h"
452
453namespace ast {
454extern struct PassVisitorStats {
455 size_t depth = 0;
456 Stats::Counters::MaxCounter<double> * max;
457 Stats::Counters::AverageCounter<double> * avg;
458} pass_visitor_stats;
459}
460
461#include "AST/Pass.impl.hpp"
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