source: src/GenPoly/Lvalue.cc@ 906e24d

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors 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 906e24d was 906e24d, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

replace results list on Expressions with a single Type field
  • Property mode set to 100644
File size: 5.0 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 PointerType *pointer = safe_dynamic_cast< PointerType* >( appExpr->get_function()->get_result() );
103 FunctionType *function = safe_dynamic_cast< FunctionType* >( pointer->get_base() );
104
105 Type *funType = isLvalueRet( function );
106 if ( funType && ! isIntrinsicApp( appExpr ) ) {
107 Expression *expr = appExpr;
108 Type *appType = appExpr->get_result();
109 if ( isPolyType( funType ) && ! isPolyType( appType ) ) {
110 // make sure cast for polymorphic type is inside dereference
111 expr = new CastExpr( appExpr, new PointerType( Type::Qualifiers(), appType->clone() ) );
112 }
113 UntypedExpr *deref = new UntypedExpr( new NameExpr( "*?" ) );
114 deref->set_result( appType->clone() );
115 appExpr->set_result( new PointerType( Type::Qualifiers(), appType ) );
116 deref->get_args().push_back( expr );
117 return deref;
118 } else {
119 return appExpr;
120 } // if
121 }
122
123 Statement * Pass1::mutate(ReturnStmt *retStmt) {
124 if ( retval && retStmt->get_expr() ) {
125 if ( retStmt->get_expr()->get_result()->get_isLvalue() ) {
126 // ***** Code Removal ***** because casts may be stripped already
127
128 // strip casts because not allowed to take address of cast
129 // while ( CastExpr *castExpr = dynamic_cast< CastExpr* >( retStmt->get_expr() ) ) {
130 // retStmt->set_expr( castExpr->get_arg() );
131 // retStmt->get_expr()->set_env( castExpr->get_env() );
132 // castExpr->set_env( 0 );
133 // castExpr->set_arg( 0 );
134 // delete castExpr;
135 // } // while
136 retStmt->set_expr( new AddressExpr( retStmt->get_expr()->acceptMutator( *this ) ) );
137 } else {
138 throw SemanticError( "Attempt to return non-lvalue from an lvalue-qualified function" );
139 } // if
140 } // if
141 return retStmt;
142 }
143
144 void Pass2::visit( FunctionType *funType ) {
145 std::string typeName;
146 if ( isLvalueRet( funType ) ) {
147 DeclarationWithType *retParm = funType->get_returnVals().front();
148
149 // make a new parameter that is a pointer to the type of the old return value
150 retParm->set_type( new PointerType( Type::Qualifiers(), retParm->get_type() ) );
151 } // if
152
153 Visitor::visit( funType );
154 }
155 } // namespace
156} // namespace GenPoly
157
158// Local Variables: //
159// tab-width: 4 //
160// mode: c++ //
161// compile-command: "make install" //
162// End: //
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