1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // Inspect.cpp -- Helpers to get information from the AST. |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Fri Jun 24 13:16:31 2022 |
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11 | // Last Modified By : Andrew Beach |
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12 | // Last Modified On : Wed Sep 22 13:50:00 2022 |
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13 | // Update Count : 2 |
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14 | // |
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15 | |
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16 | #include "Inspect.hpp" |
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17 | |
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18 | #include <iostream> |
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19 | |
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20 | #include "AST/Decl.hpp" |
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21 | #include "AST/Expr.hpp" |
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22 | #include "AST/Print.hpp" |
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23 | #include "AST/Stmt.hpp" |
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24 | #include "AST/Type.hpp" |
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25 | #include "CodeGen/OperatorTable.h" |
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26 | |
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27 | namespace ast { |
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28 | |
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29 | const Type * getPointerBase( const Type * t ) { |
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30 | if ( const auto * p = dynamic_cast< const PointerType * >( t ) ) { |
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31 | return p->base; |
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32 | } else if ( const auto * a = dynamic_cast< const ArrayType * >( t ) ) { |
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33 | return a->base; |
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34 | } else if ( const auto * r = dynamic_cast< const ReferenceType * >( t ) ) { |
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35 | return r->base; |
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36 | } else { |
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37 | return nullptr; |
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38 | } |
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39 | } |
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40 | |
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41 | template<typename CallExpr> |
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42 | static const Expr * callArg( const CallExpr * call, unsigned int pos ) { |
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43 | assertf( pos < call->args.size(), |
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44 | "getCallArg for argument that doesn't exist: (%u); %s.", |
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45 | pos, toString( call ).c_str() ); |
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46 | for ( const Expr * arg : call->args ) { |
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47 | if ( 0 == pos ) return arg; |
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48 | --pos; |
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49 | } |
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50 | assert( false ); |
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51 | } |
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52 | |
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53 | template<typename CallExpr, typename Ret> |
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54 | static Ret throughDeref( const CallExpr * expr, Ret(*func)( const Expr * ) ) { |
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55 | // In `(*f)(x)` the function we want is `f`. |
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56 | std::string name = getFunctionName( expr ); |
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57 | assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() ); |
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58 | assertf( !expr->args.empty(), "Cannot get function name from dereference with no arguments" ); |
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59 | return func( expr->args.front() ); |
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60 | } |
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61 | |
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62 | static const DeclWithType * getCalledFunction( const Expr * expr ) { |
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63 | assert( expr ); |
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64 | if ( const ast::VariableExpr * varExpr = dynamic_cast< const ast::VariableExpr * >( expr ) ) { |
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65 | return varExpr->var; |
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66 | } else if ( const ast::MemberExpr * memberExpr = dynamic_cast< const ast::MemberExpr * >( expr ) ) { |
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67 | return memberExpr->member; |
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68 | } else if ( const ast::CastExpr * castExpr = dynamic_cast< const ast::CastExpr * >( expr ) ) { |
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69 | return getCalledFunction( castExpr->arg ); |
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70 | } else if ( const ast::UntypedExpr * untypedExpr = dynamic_cast< const ast::UntypedExpr * >( expr ) ) { |
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71 | return throughDeref( untypedExpr, getCalledFunction ); |
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72 | } else if ( const ast::ApplicationExpr * appExpr = dynamic_cast< const ast::ApplicationExpr * > ( expr ) ) { |
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73 | return throughDeref( appExpr, getCalledFunction ); |
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74 | } else if ( const ast::AddressExpr * addrExpr = dynamic_cast< const ast::AddressExpr * >( expr ) ) { |
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75 | return getCalledFunction( addrExpr->arg ); |
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76 | } else if ( const ast::CommaExpr * commaExpr = dynamic_cast< const ast::CommaExpr * >( expr ) ) { |
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77 | return getCalledFunction( commaExpr->arg2 ); |
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78 | } |
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79 | return nullptr; |
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80 | } |
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81 | |
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82 | const DeclWithType * getFunction( const Expr * expr ) { |
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83 | if ( auto app = dynamic_cast< const ApplicationExpr * >( expr ) ) { |
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84 | return getCalledFunction( app->func ); |
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85 | } else if ( auto untyped = dynamic_cast< const UntypedExpr * >( expr ) ) { |
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86 | return getCalledFunction( untyped->func ); |
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87 | } |
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88 | assertf( false, "getFunction received unknown expression: %s", toString( expr ).c_str() ); |
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89 | } |
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90 | |
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91 | // There is a lot of overlap with getCalledFunction. Ideally it would use |
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92 | // it as a helper function and return the name of the DeclWithType. But the |
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93 | // NameExpr and UntypedMemberExpr only work on this version. |
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94 | static std::string funcName( const Expr * func ) { |
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95 | assert( func ); |
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96 | if ( const ast::NameExpr * nameExpr = dynamic_cast< const ast::NameExpr * >( func ) ) { |
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97 | return nameExpr->name; |
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98 | } else if ( const ast::VariableExpr * varExpr = dynamic_cast< const ast::VariableExpr * >( func ) ) { |
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99 | return varExpr->var->name; |
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100 | } else if ( const ast::CastExpr * castExpr = dynamic_cast< const ast::CastExpr * >( func ) ) { |
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101 | return funcName( castExpr->arg ); |
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102 | } else if ( const ast::MemberExpr * memberExpr = dynamic_cast< const ast::MemberExpr * >( func ) ) { |
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103 | return memberExpr->member->name; |
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104 | } else if ( const ast::UntypedMemberExpr * memberExpr = dynamic_cast< const ast::UntypedMemberExpr * > ( func ) ) { |
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105 | return funcName( memberExpr->member ); |
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106 | } else if ( const ast::UntypedExpr * untypedExpr = dynamic_cast< const ast::UntypedExpr * >( func ) ) { |
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107 | return throughDeref( untypedExpr, funcName ); |
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108 | } else if ( const ast::ApplicationExpr * appExpr = dynamic_cast< const ast::ApplicationExpr * >( func ) ) { |
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109 | return throughDeref( appExpr, funcName ); |
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110 | } else if ( const ast::ConstructorExpr * ctorExpr = dynamic_cast< const ast::ConstructorExpr * >( func ) ) { |
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111 | return funcName( getCallArg( ctorExpr->callExpr, 0 ) ); |
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112 | } else { |
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113 | assertf( false, "Unexpected expression type being called as a function in call expression: %s", toString( func ).c_str() ); |
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114 | } |
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115 | } |
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116 | |
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117 | std::string getFunctionName( const Expr * expr ) { |
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118 | // There's some unforunate overlap here with getCalledFunction. Ideally |
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119 | // this would be able to use getCalledFunction and return the name of the |
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120 | // DeclWithType, but this needs to work for NameExpr and UntypedMemberExpr, |
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121 | // where getCalledFunction can't possibly do anything reasonable. |
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122 | if ( auto app = dynamic_cast< const ApplicationExpr * >( expr ) ) { |
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123 | return funcName( app->func ); |
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124 | } else if ( auto untyped = dynamic_cast< const UntypedExpr * >( expr ) ) { |
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125 | return funcName( untyped->func ); |
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126 | } else { |
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127 | assertf( false, "Unexpected expression type passed to getFunctionName: %s", toString( expr ).c_str() ); |
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128 | } |
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129 | } |
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130 | |
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131 | const Expr * getCallArg( const Expr * call, unsigned int pos ) { |
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132 | if ( auto app = dynamic_cast< const ApplicationExpr * >( call ) ) { |
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133 | return callArg( app, pos ); |
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134 | } else if ( auto untyped = dynamic_cast< const UntypedExpr * >( call ) ) { |
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135 | return callArg( untyped, pos ); |
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136 | } else if ( auto tupleAssn = dynamic_cast< const TupleAssignExpr * >( call ) ) { |
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137 | const std::list<ptr<Stmt>>& stmts = tupleAssn->stmtExpr->stmts->kids; |
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138 | assertf( !stmts.empty(), "TupleAssignExpr missing statements." ); |
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139 | auto stmt = strict_dynamic_cast< const ExprStmt * >( stmts.back().get() ); |
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140 | auto tuple = strict_dynamic_cast< const TupleExpr * >( stmt->expr.get() ); |
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141 | assertf( !tuple->exprs.empty(), "TupleAssignExpr has empty tuple expr." ); |
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142 | return getCallArg( tuple->exprs.front(), pos ); |
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143 | } else if ( auto ctor = dynamic_cast< const ImplicitCopyCtorExpr * >( call ) ) { |
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144 | return getCallArg( ctor->callExpr, pos ); |
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145 | } else { |
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146 | assertf( false, "Unexpected expression type passed to getCallArg: %s", |
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147 | toString( call ).c_str() ); |
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148 | } |
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149 | } |
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150 | |
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151 | bool structHasFlexibleArray( const ast::StructDecl * decl ) { |
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152 | if(decl->members.size() == 0) return false; |
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153 | const auto & last = *decl->members.rbegin(); |
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154 | auto lastd = last.as<ast::DeclWithType>(); |
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155 | // I don't know what this is possible, but it might be. |
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156 | if(!lastd) return false; |
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157 | auto atype = dynamic_cast<const ast::ArrayType *>(lastd->get_type()); |
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158 | if(!atype) return false; |
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159 | return !atype->isVarLen && !atype->dimension; |
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160 | } |
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161 | |
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162 | const ApplicationExpr * isIntrinsicCallExpr( const Expr * expr ) { |
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163 | auto appExpr = dynamic_cast< const ApplicationExpr * >( expr ); |
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164 | if ( !appExpr ) return nullptr; |
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165 | |
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166 | const DeclWithType * func = getCalledFunction( appExpr->func ); |
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167 | assertf( func, |
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168 | "getCalledFunction returned nullptr: %s", toString( appExpr->func ).c_str() ); |
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169 | |
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170 | return func->linkage == ast::Linkage::Intrinsic ? appExpr : nullptr; |
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171 | } |
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172 | |
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173 | } // namespace ast |
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