source: translator/GenPoly/Specialize.cc @ a32b204

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsctordeferred_resndemanglerenumforall-pointer-decaygc_noraiijacob/cs343-translationjenkins-sandboxmemorynew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newstringwith_gc
Last change on this file since a32b204 was a32b204, checked in by Peter A. Buhr <pabuhr@…>, 9 years ago

licencing: second groups of files

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Line 
1/*
2 * This file is part of the Cforall project
3 *
4 * $Id: Specialize.cc,v 1.4 2005/08/29 20:14:13 rcbilson Exp $
5 *
6 */
7
8#include <cassert>
9
10#include "Specialize.h"
11#include "PolyMutator.h"
12
13#include "SynTree/Declaration.h"
14#include "SynTree/Statement.h"
15#include "SynTree/Expression.h"
16#include "SynTree/Type.h"
17#include "SynTree/TypeSubstitution.h"
18#include "SynTree/Mutator.h"
19#include "ResolvExpr/FindOpenVars.h"
20#include "UniqueName.h"
21#include "utility.h"
22
23
24namespace GenPoly {
25
26const std::list<Label> noLabels;
27
28class Specialize : public PolyMutator
29{
30public:
31  Specialize( std::string paramPrefix = "_p" );
32 
33  virtual Expression* mutate(ApplicationExpr *applicationExpr);
34  virtual Expression* mutate(AddressExpr *castExpr);
35  virtual Expression* mutate(CastExpr *castExpr);
36  virtual Expression* mutate(LogicalExpr *logicalExpr);
37  virtual Expression* mutate(ConditionalExpr *conditionalExpr);
38  virtual Expression* mutate(CommaExpr *commaExpr);
39
40private:
41  Expression *doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams = 0 );
42  void handleExplicitParams( ApplicationExpr *appExpr );
43 
44  UniqueName thunkNamer;
45  std::string paramPrefix;
46};
47
48void
49convertSpecializations( std::list< Declaration* >& translationUnit )
50{
51  Specialize specializer;
52  mutateAll( translationUnit, specializer );
53}
54
55Specialize::Specialize( std::string paramPrefix )
56  : thunkNamer( "_thunk" ), paramPrefix( paramPrefix )
57{
58}
59
60bool
61needsSpecialization( Type *formalType, Type *actualType, TypeSubstitution *env )
62{
63  if ( env ) {
64    using namespace ResolvExpr;
65    OpenVarSet openVars, closedVars;
66    AssertionSet need, have;
67    findOpenVars( formalType, openVars, closedVars, need, have, false );
68    findOpenVars( actualType, openVars, closedVars, need, have, true );
69    for ( OpenVarSet::const_iterator openVar = openVars.begin(); openVar != openVars.end(); ++openVar ) {
70      Type *boundType = env->lookup( openVar->first );
71      if ( ! boundType ) continue;
72      if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( boundType ) ) {
73        if ( closedVars.find( typeInst->get_name() ) == closedVars.end() ) {
74          return true;
75        }
76      } else {
77        return true;
78      }
79    }
80    return false;
81  } else {
82    return false;
83  }
84}
85
86Expression*
87Specialize::doSpecialization( Type *formalType, Expression *actual, InferredParams *inferParams )
88{
89  if ( needsSpecialization( formalType, actual->get_results().front(), env ) ) {
90    PointerType *ptrType;
91    FunctionType *funType;
92    if ( ( ptrType = dynamic_cast< PointerType* >( formalType ) ) && ( funType = dynamic_cast< FunctionType* >( ptrType->get_base() ) ) ) {
93      FunctionType *newType = funType->clone();
94      if ( env ) {
95        TypeSubstitution newEnv( *env );
96        // it is important to replace only occurrences of type variables that occur free in the
97        // thunk's type
98        newEnv.applyFree( newType );
99      }
100      FunctionDecl *thunkFunc = new FunctionDecl( thunkNamer.newName(), Declaration::NoStorageClass, LinkageSpec::C, newType, new CompoundStmt( std::list< std::string >() ), false );
101      thunkFunc->fixUniqueId();
102     
103      UniqueName paramNamer( paramPrefix );
104      ApplicationExpr *appExpr = new ApplicationExpr( actual );
105      for ( std::list< DeclarationWithType* >::iterator param = thunkFunc->get_functionType()->get_parameters().begin(); param != thunkFunc->get_functionType()->get_parameters().end(); ++param ) {
106        (*param)->set_name( paramNamer.newName() );
107        appExpr->get_args().push_back( new VariableExpr( *param ) );
108      }
109      appExpr->set_env( maybeClone( env ) );
110      if ( inferParams ) {
111        appExpr->get_inferParams() = *inferParams;
112      }
113     
114      // handle any specializations that may still be present
115      std::string oldParamPrefix = paramPrefix;
116      paramPrefix += "p";
117      std::list< Statement* > oldStmts;
118      oldStmts.splice( oldStmts.end(), stmtsToAdd );
119      handleExplicitParams( appExpr );
120      paramPrefix = oldParamPrefix;
121      thunkFunc->get_statements()->get_kids().splice( thunkFunc->get_statements()->get_kids().end(), stmtsToAdd );
122      stmtsToAdd.splice( stmtsToAdd.end(), oldStmts );
123     
124      Statement *appStmt;
125      if ( funType->get_returnVals().empty() ) {
126        appStmt = new ExprStmt( noLabels, appExpr );
127      } else {
128        appStmt = new ReturnStmt( noLabels, appExpr );
129      }
130      thunkFunc->get_statements()->get_kids().push_back( appStmt );
131      stmtsToAdd.push_back( new DeclStmt( noLabels, thunkFunc ) );
132      return new AddressExpr( new VariableExpr( thunkFunc ) );
133    } else {
134      return actual;
135    }
136  } else {
137    return actual;
138  }
139}
140
141void
142Specialize::handleExplicitParams( ApplicationExpr *appExpr )
143{
144  // create thunks for the explicit parameters
145  assert( ! appExpr->get_function()->get_results().empty() );
146  PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() );
147  assert( pointer );
148  FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() );
149  std::list< DeclarationWithType* >::iterator formal;
150  std::list< Expression* >::iterator actual;
151  for ( formal = function->get_parameters().begin(), actual = appExpr->get_args().begin(); formal != function->get_parameters().end() && actual != appExpr->get_args().end(); ++formal, ++actual ) {
152    *actual = doSpecialization( (*formal)->get_type(), *actual, &appExpr->get_inferParams() );
153  }
154}
155
156Expression* 
157Specialize::mutate(ApplicationExpr *appExpr)
158{
159  appExpr->get_function()->acceptMutator( *this );
160  mutateAll( appExpr->get_args(), *this );
161 
162  // create thunks for the inferred parameters
163  for ( InferredParams::iterator inferParam = appExpr->get_inferParams().begin(); inferParam != appExpr->get_inferParams().end(); ++inferParam ) {
164    inferParam->second.expr = doSpecialization( inferParam->second.formalType, inferParam->second.expr, &appExpr->get_inferParams() );
165  }
166 
167  handleExplicitParams(appExpr);
168 
169  return appExpr;
170}
171
172Expression* 
173Specialize::mutate(AddressExpr *addrExpr)
174{
175  addrExpr->get_arg()->acceptMutator( *this );
176  addrExpr->set_arg( doSpecialization( addrExpr->get_results().front(), addrExpr->get_arg() ) );
177  return addrExpr;
178}
179
180Expression* 
181Specialize::mutate(CastExpr *castExpr)
182{
183  castExpr->get_arg()->acceptMutator( *this );
184  castExpr->set_arg( doSpecialization( castExpr->get_results().front(), castExpr->get_arg() ) );
185  return castExpr;
186}
187
188Expression* 
189Specialize::mutate(LogicalExpr *logicalExpr)
190{
191  return logicalExpr;
192}
193
194Expression* 
195Specialize::mutate(ConditionalExpr *condExpr)
196{
197  return condExpr;
198}
199
200Expression* 
201Specialize::mutate(CommaExpr *commaExpr)
202{
203  return commaExpr;
204}
205
206} // namespace GenPoly
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