source: src/GenPoly/Lvalue.cc@ e491159

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors ctor deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since e491159 was baba5d8, checked in by Aaron Moss <a3moss@…>, 10 years ago

Fix lvalue casts to not break batchtest
  • Property mode set to 100644
File size: 5.2 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2015 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// Lvalue.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Mon May 18 07:44:20 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Tue Dec 15 15:33:13 2015
13// Update Count : 3
14//
15
16#include <cassert>
17
18#include "Lvalue.h"
19
20#include "GenPoly.h"
21
22#include "SynTree/Declaration.h"
23#include "SynTree/Type.h"
24#include "SynTree/Expression.h"
25#include "SynTree/Statement.h"
26#include "SynTree/Visitor.h"
27#include "SynTree/Mutator.h"
28#include "SymTab/Indexer.h"
29#include "ResolvExpr/Resolver.h"
30#include "ResolvExpr/typeops.h"
31
32#include "Common/UniqueName.h"
33#include "Common/utility.h"
34
35namespace GenPoly {
36 namespace {
37 const std::list<Label> noLabels;
38
39 /// Replace uses of lvalue returns with appropriate pointers
40 class Pass1 : public Mutator {
41 public:
42 Pass1();
43
44 virtual Expression *mutate( ApplicationExpr *appExpr );
45 virtual Statement *mutate( ReturnStmt *appExpr );
46 virtual DeclarationWithType *mutate( FunctionDecl *funDecl );
47 private:
48 DeclarationWithType* retval;
49 };
50
51 /// Replace declarations of lvalue returns with appropriate pointers
52 class Pass2 : public Visitor {
53 public:
54 virtual void visit( FunctionType *funType );
55 private:
56 };
57 } // namespace
58
59 void convertLvalue( std::list< Declaration* >& translationUnit ) {
60 Pass1 p1;
61 Pass2 p2;
62 mutateAll( translationUnit, p1 );
63 acceptAll( translationUnit, p2 );
64 }
65
66 namespace {
67 Type* isLvalueRet( FunctionType *function ) {
68 if ( function->get_returnVals().empty() ) return 0;
69 Type *ty = function->get_returnVals().front()->get_type();
70 return ty->get_isLvalue() ? ty : 0;
71 }
72
73 bool isIntrinsicApp( ApplicationExpr *appExpr ) {
74 if ( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( appExpr->get_function() ) ) {
75 return varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic;
76 } else {
77 return false;
78 } // if
79 }
80
81 Pass1::Pass1() {
82 }
83
84 DeclarationWithType * Pass1::mutate( FunctionDecl *funcDecl ) {
85 if ( funcDecl->get_statements() ) {
86 DeclarationWithType* oldRetval = retval;
87 retval = 0;
88 if ( ! LinkageSpec::isBuiltin( funcDecl->get_linkage() ) && isLvalueRet( funcDecl->get_functionType() ) ) {
89 retval = funcDecl->get_functionType()->get_returnVals().front();
90 }
91 // fix expressions and return statements in this function
92 funcDecl->set_statements( funcDecl->get_statements()->acceptMutator( *this ) );
93 retval = oldRetval;
94 } // if
95 return funcDecl;
96 }
97
98 Expression * Pass1::mutate( ApplicationExpr *appExpr ) {
99 appExpr->get_function()->acceptMutator( *this );
100 mutateAll( appExpr->get_args(), *this );
101
102 assert( ! appExpr->get_function()->get_results().empty() );
103
104 PointerType *pointer = dynamic_cast< PointerType* >( appExpr->get_function()->get_results().front() );
105 assert( pointer );
106 FunctionType *function = dynamic_cast< FunctionType* >( pointer->get_base() );
107 assert( function );
108
109 Type *funType = isLvalueRet( function );
110 if ( funType && ! isIntrinsicApp( appExpr ) ) {
111 Expression *expr = appExpr;
112 Type *appType = appExpr->get_results().front();
113 if ( isPolyType( funType ) && ! isPolyType( appType ) ) {
114 // make sure cast for polymorphic type is inside dereference
115 expr = new CastExpr( appExpr, new PointerType( Type::Qualifiers(), appType->clone() ) );
116 }
117 UntypedExpr *deref = new UntypedExpr( new NameExpr( "*?" ) );
118 deref->get_results().push_back( appType->clone() );
119 appExpr->get_results().front() = new PointerType( Type::Qualifiers(), appType );
120 deref->get_args().push_back( expr );
121 return deref;
122 } else {
123 return appExpr;
124 } // if
125 }
126
127 Statement * Pass1::mutate(ReturnStmt *retStmt) {
128 if ( retval && retStmt->get_expr() ) {
129 assert( ! retStmt->get_expr()->get_results().empty() );
130 if ( retStmt->get_expr()->get_results().front()->get_isLvalue() ) {
131 // ***** Code Removal ***** because casts may be stripped already
132
133 // strip casts because not allowed to take address of cast
134 // while ( CastExpr *castExpr = dynamic_cast< CastExpr* >( retStmt->get_expr() ) ) {
135 // retStmt->set_expr( castExpr->get_arg() );
136 // retStmt->get_expr()->set_env( castExpr->get_env() );
137 // castExpr->set_env( 0 );
138 // castExpr->set_arg( 0 );
139 // delete castExpr;
140 // } // while
141 retStmt->set_expr( new AddressExpr( retStmt->get_expr()->acceptMutator( *this ) ) );
142 } else {
143 throw SemanticError( "Attempt to return non-lvalue from an lvalue-qualified function" );
144 } // if
145 } // if
146 return retStmt;
147 }
148
149 void Pass2::visit( FunctionType *funType ) {
150 std::string typeName;
151 if ( isLvalueRet( funType ) ) {
152 DeclarationWithType *retParm = funType->get_returnVals().front();
153
154 // make a new parameter that is a pointer to the type of the old return value
155 retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
156 } // if
157
158 Visitor::visit( funType );
159 }
160 } // namespace
161} // namespace GenPoly
162
163// Local Variables: //
164// tab-width: 4 //
165// mode: c++ //
166// compile-command: "make install" //
167// End: //
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