source: src/AST/Pass.hpp@ b28ce93

Last change on this file since b28ce93 was 857b5f9, checked in by Andrew Beach <ajbeach@…>, 8 months ago

CountExpr -> CountofExpr. Actually the main fix was making countof use the same pattern as sizeof/alignof, using a typeof to combine the two cases and have one field instead of two.
  • Property mode set to 100644
File size: 21.4 KB
RevLine 
[04124c4]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
[a86b2ca6]10// Created On : Thu May 09 15:37:05 2019
[04124c4]11// Last Modified By :
12// Last Modified On :
13// Update Count :
14//
15
[f47f887]16#pragma once
[04124c4]17// IWYU pragma: private, include "AST/Pass.hpp"
[f47f887]18
19#include <functional>
20#include <list>
21#include <stack>
22
[04124c4]23#include "AST/Fwd.hpp"
24#include "AST/Node.hpp"
[6d51bd7]25
26#include "AST/Attribute.hpp"
[04124c4]27#include "AST/Decl.hpp"
[6d51bd7]28#include "AST/Expr.hpp"
29#include "AST/Init.hpp"
30#include "AST/Stmt.hpp"
[8a5530c]31#include "AST/Type.hpp"
[6d51bd7]32
[04124c4]33#include "AST/Visitor.hpp"
34
[0e42794]35#include "AST/SymbolTable.hpp"
[f47f887]36
37// Private prelude header, needed for some of the magic tricks this class pulls off
[04124c4]38#include "AST/Pass.proto.hpp"
[f47f887]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
[73f1b1c]48// | PureVisitor - makes the visitor pure, it never modifies nodes in place and always
49// clones nodes it needs to make changes to
[b2a11ba]50// | WithConstTypeSubstitution - provides polymorphic const TypeSubstitution * typeSubs for the
[e0e9a0b]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
[e6b42e7]66//
67// Other Special Members:
[d0bdb18]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.
[e6b42e7]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.
[f47f887]74//-------------------------------------------------------------------------------------------------
[7ff3e522]75template< typename core_t >
[f47f887]76class Pass final : public ast::Visitor {
77public:
[7ff3e522]78 using core_type = core_t;
79 using type = Pass<core_t>;
80
[04124c4]81 /// Forward any arguments to the pass constructor
82 /// Propagate 'this' if necessary
[f47f887]83 template< typename... Args >
84 Pass( Args &&... args)
[7ff3e522]85 : core( std::forward<Args>( args )... )
[f47f887]86 {
87 // After the pass is constructed, check if it wants the have a pointer to the wrapping visitor
[66a89e7]88 type * const * visitor = __pass::visitor( core, 0 );
89 if ( visitor ) {
[7ff3e522]90 *const_cast<type **>( visitor ) = this;
[f47f887]91 }
92 }
93
94 virtual ~Pass() = default;
95
[e6b42e7]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.
[66a89e7]100 inline auto get_result() -> decltype( __pass::result::get( core, '0' ) ) {
101 return __pass::result::get( core, '0' );
[e6b42e7]102 }
103
[a86b2ca6]104 /// Construct and run a pass on a translation unit.
105 template< typename... Args >
[293dc1c]106 static void run( TranslationUnit & decls, Args &&... args ) {
[7ff3e522]107 Pass<core_t> visitor( std::forward<Args>( args )... );
[a86b2ca6]108 accept_all( decls, visitor );
109 }
110
[e6b42e7]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 )... );
[ce36b55]115 auto const * temp = node->accept( visitor );
[e6b42e7]116 assert( temp == node );
117 return visitor.get_result();
118 }
119
[04124c4]120 /// Visit function declarations
[23f99e1]121 const ast::DeclWithType * visit( const ast::ObjectDecl * ) override final;
122 const ast::DeclWithType * visit( const ast::FunctionDecl * ) override final;
123 const ast::Decl * visit( const ast::StructDecl * ) override final;
124 const ast::Decl * visit( const ast::UnionDecl * ) override final;
125 const ast::Decl * visit( const ast::EnumDecl * ) override final;
126 const ast::Decl * visit( const ast::TraitDecl * ) override final;
127 const ast::Decl * visit( const ast::TypeDecl * ) override final;
128 const ast::Decl * visit( const ast::TypedefDecl * ) override final;
129 const ast::AsmDecl * visit( const ast::AsmDecl * ) override final;
[2d019af]130 const ast::DirectiveDecl * visit( const ast::DirectiveDecl * ) override final;
[23f99e1]131 const ast::StaticAssertDecl * visit( const ast::StaticAssertDecl * ) override final;
[19a8c40]132 const ast::DeclWithType * visit( const ast::InlineMemberDecl * ) override final;
[23f99e1]133 const ast::CompoundStmt * visit( const ast::CompoundStmt * ) override final;
134 const ast::Stmt * visit( const ast::ExprStmt * ) override final;
135 const ast::Stmt * visit( const ast::AsmStmt * ) override final;
136 const ast::Stmt * visit( const ast::DirectiveStmt * ) override final;
137 const ast::Stmt * visit( const ast::IfStmt * ) override final;
[3b0bc16]138 const ast::Stmt * visit( const ast::WhileDoStmt * ) override final;
[23f99e1]139 const ast::Stmt * visit( const ast::ForStmt * ) override final;
[fca78f1]140 const ast::Stmt * visit( const ast::ForeachStmt * ) override final;
[23f99e1]141 const ast::Stmt * visit( const ast::SwitchStmt * ) override final;
[400b8be]142 const ast::CaseClause * visit( const ast::CaseClause * ) override final;
[23f99e1]143 const ast::Stmt * visit( const ast::BranchStmt * ) override final;
144 const ast::Stmt * visit( const ast::ReturnStmt * ) override final;
145 const ast::Stmt * visit( const ast::ThrowStmt * ) override final;
146 const ast::Stmt * visit( const ast::TryStmt * ) override final;
[400b8be]147 const ast::CatchClause * visit( const ast::CatchClause * ) override final;
148 const ast::FinallyClause * visit( const ast::FinallyClause * ) override final;
[37cdd97]149 const ast::Stmt * visit( const ast::SuspendStmt * ) override final;
[cf3da24]150 const ast::WhenClause * visit( const ast::WhenClause * ) override final;
[23f99e1]151 const ast::Stmt * visit( const ast::WaitForStmt * ) override final;
[f6e6a55]152 const ast::WaitForClause * visit( const ast::WaitForClause * ) override final;
[cf3da24]153 const ast::Stmt * visit( const ast::WaitUntilStmt * ) override final;
[e67991f]154 const ast::Decl * visit( const ast::WithStmt * ) override final;
[23f99e1]155 const ast::NullStmt * visit( const ast::NullStmt * ) override final;
156 const ast::Stmt * visit( const ast::DeclStmt * ) override final;
157 const ast::Stmt * visit( const ast::ImplicitCtorDtorStmt * ) override final;
[6cebfef]158 const ast::Stmt * visit( const ast::MutexStmt * ) override final;
[cf3da24]159 const ast::Stmt * visit( const ast::CorunStmt * ) override final;
[3d9d017]160 const ast::Stmt * visit( const ast::CoforStmt * ) override final;
[23f99e1]161 const ast::Expr * visit( const ast::ApplicationExpr * ) override final;
162 const ast::Expr * visit( const ast::UntypedExpr * ) override final;
163 const ast::Expr * visit( const ast::NameExpr * ) override final;
[fad1f14]164 const ast::Expr * visit( const ast::QualifiedNameExpr * ) override final;
[23f99e1]165 const ast::Expr * visit( const ast::AddressExpr * ) override final;
166 const ast::Expr * visit( const ast::LabelAddressExpr * ) override final;
167 const ast::Expr * visit( const ast::CastExpr * ) override final;
168 const ast::Expr * visit( const ast::KeywordCastExpr * ) override final;
169 const ast::Expr * visit( const ast::VirtualCastExpr * ) override final;
170 const ast::Expr * visit( const ast::UntypedMemberExpr * ) override final;
171 const ast::Expr * visit( const ast::MemberExpr * ) override final;
172 const ast::Expr * visit( const ast::VariableExpr * ) override final;
173 const ast::Expr * visit( const ast::ConstantExpr * ) override final;
174 const ast::Expr * visit( const ast::SizeofExpr * ) override final;
175 const ast::Expr * visit( const ast::AlignofExpr * ) override final;
[857b5f9]176 const ast::Expr * visit( const ast::CountofExpr * ) override final;
[23f99e1]177 const ast::Expr * visit( const ast::UntypedOffsetofExpr * ) override final;
178 const ast::Expr * visit( const ast::OffsetofExpr * ) override final;
179 const ast::Expr * visit( const ast::OffsetPackExpr * ) override final;
180 const ast::Expr * visit( const ast::LogicalExpr * ) override final;
181 const ast::Expr * visit( const ast::ConditionalExpr * ) override final;
182 const ast::Expr * visit( const ast::CommaExpr * ) override final;
183 const ast::Expr * visit( const ast::TypeExpr * ) override final;
[4ec9513]184 const ast::Expr * visit( const ast::DimensionExpr * ) override final;
[23f99e1]185 const ast::Expr * visit( const ast::AsmExpr * ) override final;
186 const ast::Expr * visit( const ast::ImplicitCopyCtorExpr * ) override final;
187 const ast::Expr * visit( const ast::ConstructorExpr * ) override final;
188 const ast::Expr * visit( const ast::CompoundLiteralExpr * ) override final;
189 const ast::Expr * visit( const ast::RangeExpr * ) override final;
190 const ast::Expr * visit( const ast::UntypedTupleExpr * ) override final;
191 const ast::Expr * visit( const ast::TupleExpr * ) override final;
192 const ast::Expr * visit( const ast::TupleIndexExpr * ) override final;
193 const ast::Expr * visit( const ast::TupleAssignExpr * ) override final;
194 const ast::Expr * visit( const ast::StmtExpr * ) override final;
195 const ast::Expr * visit( const ast::UniqueExpr * ) override final;
196 const ast::Expr * visit( const ast::UntypedInitExpr * ) override final;
197 const ast::Expr * visit( const ast::InitExpr * ) override final;
198 const ast::Expr * visit( const ast::DeletedExpr * ) override final;
199 const ast::Expr * visit( const ast::DefaultArgExpr * ) override final;
200 const ast::Expr * visit( const ast::GenericExpr * ) override final;
201 const ast::Type * visit( const ast::VoidType * ) override final;
202 const ast::Type * visit( const ast::BasicType * ) override final;
203 const ast::Type * visit( const ast::PointerType * ) override final;
204 const ast::Type * visit( const ast::ArrayType * ) override final;
205 const ast::Type * visit( const ast::ReferenceType * ) override final;
206 const ast::Type * visit( const ast::QualifiedType * ) override final;
207 const ast::Type * visit( const ast::FunctionType * ) override final;
208 const ast::Type * visit( const ast::StructInstType * ) override final;
209 const ast::Type * visit( const ast::UnionInstType * ) override final;
210 const ast::Type * visit( const ast::EnumInstType * ) override final;
211 const ast::Type * visit( const ast::TraitInstType * ) override final;
212 const ast::Type * visit( const ast::TypeInstType * ) override final;
213 const ast::Type * visit( const ast::TupleType * ) override final;
214 const ast::Type * visit( const ast::TypeofType * ) override final;
[3945abe]215 const ast::Type * visit( const ast::VTableType * ) override final;
[23f99e1]216 const ast::Type * visit( const ast::VarArgsType * ) override final;
217 const ast::Type * visit( const ast::ZeroType * ) override final;
218 const ast::Type * visit( const ast::OneType * ) override final;
219 const ast::Type * visit( const ast::GlobalScopeType * ) override final;
220 const ast::Designation * visit( const ast::Designation * ) override final;
221 const ast::Init * visit( const ast::SingleInit * ) override final;
222 const ast::Init * visit( const ast::ListInit * ) override final;
223 const ast::Init * visit( const ast::ConstructorInit * ) override final;
224 const ast::Attribute * visit( const ast::Attribute * ) override final;
225 const ast::TypeSubstitution * visit( const ast::TypeSubstitution * ) override final;
[f47f887]226
[7ff3e522]227 template<typename core_type>
228 friend void accept_all( std::list< ptr<Decl> > & decls, Pass<core_type>& visitor );
[53d55b6]229
230 bool isInFunction() const {
231 return inFunction;
232 }
233
[f47f887]234private:
235
[164a6b6]236 bool __visit_children() { bool * ptr = __pass::visit_children(core, 0); return ptr ? *ptr : true; }
[f47f887]237
238private:
239
[90320ac]240 /// The return type of the general call_accept function.
[6d51bd7]241 template< typename node_t >
[90320ac]242 using call_accept_result_t = __pass::result1<
243 typename std::remove_pointer< typename std::result_of<
244 decltype(&node_t::accept)(node_t*, type&) >::type >::type
[eb211bf]245 >;
[f8143a6]246
[eb211bf]247 template< typename node_t >
[90320ac]248 auto call_accept( const node_t * node ) -> call_accept_result_t<node_t>;
[f8143a6]249
[eb211bf]250 // requests WithStmtsToAdd directly add to this statement, as if it is a compound.
251 __pass::result1<ast::Stmt> call_accept_as_compound(const ast::Stmt *);
[f8143a6]252
[9e23b446]253 // requests type environment to be updated (why is it implemented like this?)
254 __pass::result1<ast::Expr> call_accept_top(const ast::Expr *);
255
[f8143a6]256 template< template <class...> class container_t >
[eb211bf]257 __pass::resultNstmt<container_t> call_accept( const container_t< ptr<Stmt> > & );
[f47f887]258
[6d51bd7]259 template< template <class...> class container_t, typename node_t >
[eb211bf]260 __pass::resultN< container_t, node_t > call_accept( const container_t< ptr<node_t> > & container );
[f47f887]261
[2b59f55]262public:
[6d51bd7]263 /// Logic to call the accept and mutate the parent if needed, delegates call to accept
[f8143a6]264 template<typename node_t, typename parent_t, typename field_t>
265 void maybe_accept(const node_t * &, field_t parent_t::* field);
[6d51bd7]266
[f8143a6]267 template<typename node_t, typename parent_t, typename field_t>
268 void maybe_accept_as_compound(const node_t * &, field_t parent_t::* field);
[490fb92e]269
[9e23b446]270 template<typename node_t, typename parent_t, typename field_t>
271 void maybe_accept_top(const node_t * &, field_t parent_t::* field);
272
[f47f887]273private:
[0e42794]274 /// Internal RAII guard for symbol table features
275 struct guard_symtab {
[7ff3e522]276 guard_symtab( Pass<core_t> & pass ): pass( pass ) { __pass::symtab::enter(pass.core, 0); }
277 ~guard_symtab() { __pass::symtab::leave(pass.core, 0); }
278 Pass<core_t> & pass;
[f47f887]279 };
280
[04124c4]281 /// Internal RAII guard for scope features
282 struct guard_scope {
[7ff3e522]283 guard_scope( Pass<core_t> & pass ): pass( pass ) { __pass::scope::enter(pass.core, 0); }
284 ~guard_scope() { __pass::scope::leave(pass.core, 0); }
285 Pass<core_t> & pass;
[f47f887]286 };
[23f99e1]287
[e0e9a0b]288 /// Internal RAII guard for forall substitutions
289 struct guard_forall_subs {
[361bf01]290 guard_forall_subs( Pass<core_t> & pass, const FunctionType * type )
[7ff3e522]291 : pass( pass ), type( type ) { __pass::forall::enter(pass.core, 0, type ); }
292 ~guard_forall_subs() { __pass::forall::leave(pass.core, 0, type ); }
293 Pass<core_t> & pass;
[361bf01]294 const FunctionType * type;
[e0e9a0b]295 };
296
[23f99e1]297private:
298 bool inFunction = false;
[c6c682cf]299 bool atFunctionTop = false;
[f47f887]300};
301
[d8938622]302/// Apply a pass to an entire translation unit
[7ff3e522]303template<typename core_t>
304void accept_all( std::list< ast::ptr<ast::Decl> > &, ast::Pass<core_t> & visitor );
[f47f887]305
[293dc1c]306template<typename core_t>
307void accept_all( ast::TranslationUnit &, ast::Pass<core_t> & visitor );
308
[04124c4]309//-------------------------------------------------------------------------------------------------
[f47f887]310// PASS ACCESSORIES
[04124c4]311//-------------------------------------------------------------------------------------------------
[f47f887]312
[73f1b1c]313/// If used the visitor will always clone nodes.
[d3aa64f1]314struct PureVisitor {};
315
[e9e9f56]316/// Keep track of the nearest parent node's location field.
[a9762dc]317struct WithCodeLocation {
318 const CodeLocation * location = nullptr;
319};
320
[b2a11ba]321/// Keep track of the polymorphic const TypeSubstitution * typeSubs for the current expression.
[04124c4]322struct WithConstTypeSubstitution {
[b2a11ba]323 const TypeSubstitution * typeSubs = nullptr;
[04124c4]324};
325
326/// Used if visitor requires added statements before or after the current node.
327/// The Pass template handles what *before* and *after* means automatically
[6d51bd7]328template< template<class...> class container_t = std::list >
[ed96731]329struct WithStmtsToAddX {
[04124c4]330 container_t< ptr<Stmt> > stmtsToAddBefore;
331 container_t< ptr<Stmt> > stmtsToAddAfter;
[f47f887]332};
333
[ed96731]334struct WithStmtsToAdd : public WithStmtsToAddX<> {};
335
[04124c4]336/// Used if visitor requires added declarations before or after the current node.
337/// The Pass template handles what *before* and *after* means automatically
[6d51bd7]338template< template<class...> class container_t = std::list >
[ed96731]339struct WithDeclsToAddX {
[04124c4]340 container_t< ptr<Decl> > declsToAddBefore;
341 container_t< ptr<Decl> > declsToAddAfter;
[f47f887]342};
343
[ed96731]344struct WithDeclsToAdd : public WithDeclsToAddX<> {};
345
[04124c4]346/// Use if visitation should stop at certain levels
347/// set visit_children false of all child nodes should be ignored
[f47f887]348struct WithShortCircuiting {
[a7efc96]349 bool visit_children = true;
[f47f887]350};
351
[04124c4]352/// Used to restore values/functions/etc. when the Pass finishes visiting this node
353class WithGuards {
[e16e27e1]354 __pass::at_cleanup_t at_cleanup = [](__pass::cleanup_func_t, void*) {
355 std::cerr << "No cleanup function was set" << std::endl;
356 abort();
357 };
[f47f887]358
[96c04e4]359 template< typename core_t >
[822332e]360 friend auto __pass::make_value_guard( core_t & core, int )
361 -> decltype( __pass::value_guard( core.at_cleanup ) );
[04124c4]362public:
[e16e27e1]363
[04124c4]364 /// When this node is finished being visited, restore the value of a variable
[148ba7d]365 /// You may assign to the return value to set the new value in the same statement.
[04124c4]366 template< typename T >
[148ba7d]367 T& GuardValue( T& val ) {
[04124c4]368 at_cleanup( [ val ]( void * newVal ) {
369 * static_cast< T * >( newVal ) = val;
370 }, static_cast< void * >( & val ) );
[148ba7d]371 return val;
[04124c4]372 }
[f47f887]373
[04124c4]374 /// On the object, all beginScope now and endScope when the current node is finished being visited
375 template< typename T >
376 void GuardScope( T& val ) {
377 val.beginScope();
378 at_cleanup( []( void * val ) {
379 static_cast< T * >( val )->endScope();
380 }, static_cast< void * >( & val ) );
381 }
[f47f887]382
[04124c4]383 /// When this node is finished being visited, call a function
384 template< typename Func >
385 void GuardAction( Func func ) {
386 at_cleanup( [func](void *) { func(); }, nullptr );
387 }
388};
[f47f887]389
[04124c4]390/// Used to get a pointer to the pass with its wrapped type
[7ff3e522]391template<typename core_t>
[04124c4]392struct WithVisitorRef {
[7ff3e522]393 Pass<core_t> * const visitor = nullptr;
[f47f887]394
[53d55b6]395 bool isInFunction() const {
396 return visitor->isInFunction();
[cb25fc9]397 }
398};
399
[b9fe89b]400/// Use when the templated visitor should update the symbol table,
401/// that is, when your pass core needs to query the symbol table.
402/// Expected setups:
403/// - For master passes that kick off at the compilation unit
404/// - before resolver: extend WithSymbolTableX<IgnoreErrors>
405/// - after resolver: extend WithSymbolTable and use defaults
406/// - (FYI, for completeness, the resolver's main pass uses ValidateOnAdd when it kicks off)
407/// - For helper passes that kick off at arbitrary points in the AST:
408/// - take an existing symbol table as a parameter, extend WithSymbolTable,
409/// and construct with WithSymbolTable(const SymbolTable &)
[0e42794]410struct WithSymbolTable {
[b9fe89b]411 WithSymbolTable(const ast::SymbolTable & from) : symtab(from) {}
412 WithSymbolTable(ast::SymbolTable::ErrorDetection errorMode = ast::SymbolTable::ErrorDetection::AssertClean) : symtab(errorMode) {}
413 ast::SymbolTable symtab;
414};
415template <ast::SymbolTable::ErrorDetection errorMode>
416struct WithSymbolTableX : WithSymbolTable {
417 WithSymbolTableX() : WithSymbolTable(errorMode) {}
[f47f887]418};
[e0e9a0b]419
[c600df1]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
[6d51bd7]430}
431
[c92bdcc]432#include "Common/Stats.hpp"
[6d51bd7]433
[172d9342]434namespace ast {
[6d51bd7]435extern struct PassVisitorStats {
436 size_t depth = 0;
[c408483]437 Stats::Counters::MaxCounter<double> * max;
438 Stats::Counters::AverageCounter<double> * avg;
[6d51bd7]439} pass_visitor_stats;
[172d9342]440}
[6d51bd7]441
[be8518f]442#include "AST/Pass.impl.hpp"
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