Resolve the type from an ArrayIndexExpression

Adds new TypeVisitor to resolve Types from the AST via Visitor Pattern, so
the element type can be extracted.

Addresses: gcc-mirror#27 gcc-mirror#55

gcc/rust/analysis/rust-type-resolution.cc

@@ -1,5 +1,6 @@
 #include "rust-type-resolution.h"
 #include "rust-diagnostics.h"
+#include "rust-type-visitor.h"
 
 #define ADD_BUILTIN_TYPE(_X, _S) \
  do \
@@ -470,8 +471,6 @@ TypeResolution::visit (AST::ArrayExpr &expr)
 void
 TypeResolution::visit (AST::ArrayIndexExpr &expr)
 {
- printf ("ArrayIndexExpr: %s\n", expr.as_string ().c_str ());
-
  auto before = typeBuffer.size ();
  expr.get_array_expr ()->accept_vis (*this);
  if (typeBuffer.size () <= before)
@@ -495,16 +494,20 @@ TypeResolution::visit (AST::ArrayIndexExpr &expr)
  AST::Type *array_index_type = typeBuffer.back ();
  typeBuffer.pop_back ();
 
- printf ("Array expr type %s array index expr type: [%s]\n",
- array_expr_type->as_string ().c_str (),
- array_index_type->as_string ().c_str ());
-
- // the the element type from the array_expr_type and it _must_ be an array
- // TODO
-
  // check the index_type should be an i32 which should really be
  // more permissive
  // TODO
+
+ // the the element type from the array_expr_type and it _must_ be an array
+ AST::ArrayType *resolved = ArrayTypeVisitor::Resolve (array_expr_type);
+ if (resolved == nullptr)
+ {
+ rust_error_at (expr.get_locus_slow (),
+ "unable to resolve type for array expression");
+ return;
+ }
+
+ typeBuffer.push_back (resolved->get_element_type ());
 }
 
 void

gcc/rust/analysis/rust-type-resolution.h

@@ -1,3 +1,20 @@
+// Copyright (C) 2020 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
 #pragma once
 
 #include "rust-resolution.h"

gcc/rust/analysis/rust-type-visitor.h

@@ -0,0 +1,261 @@
+// rust-type-visitor.h -- Rust AST Visitor to AST::Type specific
+// Copyright (C) 2020 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#ifndef RUST_TYPE_VISITOR_H
+#define RUST_TYPE_VISITOR_H
+
+#include "rust-system.h"
+#include "rust-ast-full.h"
+#include "rust-ast-visitor.h"
+#include "rust-scan.h"
+
+namespace Rust {
+namespace Analysis {
+
+class BaseTypeVisitor : public AST::ASTVisitor
+{
+public:
+ // visitor impl
+ // rust-ast.h
+ // virtual void visit(AttrInput& attr_input);
+ // virtual void visit(TokenTree& token_tree);
+ // virtual void visit(MacroMatch& macro_match);
+ virtual void visit (AST::Token &tok) override {}
+ virtual void visit (AST::DelimTokenTree &delim_tok_tree) override {}
+ virtual void visit (AST::AttrInputMetaItemContainer &input) override {}
+ // virtual void visit(MetaItem& meta_item) override {}
+ // void vsit(Stmt& stmt) override {}
+ // virtual void visit(Expr& expr) override {}
+ virtual void visit (AST::IdentifierExpr &ident_expr) override {}
+ // virtual void visit(Pattern& pattern) override {}
+ // virtual void visit(Type& type) override {}
+ // virtual void visit(TypeParamBound& type_param_bound) override {}
+ virtual void visit (AST::Lifetime &lifetime) override {}
+ // virtual void visit(GenericParam& generic_param) override {}
+ virtual void visit (AST::LifetimeParam &lifetime_param) override {}
+ // virtual void visit(TraitItem& trait_item) override {}
+ // virtual void visit(InherentImplItem& inherent_impl_item) override {}
+ // virtual void visit(TraitImplItem& trait_impl_item) override {}
+ virtual void visit (AST::MacroInvocationSemi &macro) override {}
+
+ // rust-path.h
+ virtual void visit (AST::PathInExpression &path) override {}
+ virtual void visit (AST::TypePathSegment &segment) override {}
+ virtual void visit (AST::TypePathSegmentGeneric &segment) override {}
+ virtual void visit (AST::TypePathSegmentFunction &segment) override {}
+ virtual void visit (AST::TypePath &path) override {}
+ virtual void visit (AST::QualifiedPathInExpression &path) override {}
+ virtual void visit (AST::QualifiedPathInType &path) override {}
+
+ // rust-expr.h
+ virtual void visit (AST::LiteralExpr &expr) override {}
+ virtual void visit (AST::AttrInputLiteral &attr_input) override {}
+ virtual void visit (AST::MetaItemLitExpr &meta_item) override {}
+ virtual void visit (AST::MetaItemPathLit &meta_item) override {}
+ virtual void visit (AST::BorrowExpr &expr) override {}
+ virtual void visit (AST::DereferenceExpr &expr) override {}
+ virtual void visit (AST::ErrorPropagationExpr &expr) override {}
+ virtual void visit (AST::NegationExpr &expr) override {}
+ virtual void visit (AST::ArithmeticOrLogicalExpr &expr) override {}
+ virtual void visit (AST::ComparisonExpr &expr) override {}
+ virtual void visit (AST::LazyBooleanExpr &expr) override {}
+ virtual void visit (AST::TypeCastExpr &expr) override {}
+ virtual void visit (AST::AssignmentExpr &expr) override {}
+ virtual void visit (AST::CompoundAssignmentExpr &expr) override {}
+ virtual void visit (AST::GroupedExpr &expr) override {}
+ // virtual void visit(ArrayElems& elems) override {}
+ virtual void visit (AST::ArrayElemsValues &elems) override {}
+ virtual void visit (AST::ArrayElemsCopied &elems) override {}
+ virtual void visit (AST::ArrayExpr &expr) override {}
+ virtual void visit (AST::ArrayIndexExpr &expr) override {}
+ virtual void visit (AST::TupleExpr &expr) override {}
+ virtual void visit (AST::TupleIndexExpr &expr) override {}
+ virtual void visit (AST::StructExprStruct &expr) override {}
+ // virtual void visit(StructExprField& field) override {}
+ virtual void visit (AST::StructExprFieldIdentifier &field) override {}
+ virtual void visit (AST::StructExprFieldIdentifierValue &field) override {}
+ virtual void visit (AST::StructExprFieldIndexValue &field) override {}
+ virtual void visit (AST::StructExprStructFields &expr) override {}
+ virtual void visit (AST::StructExprStructBase &expr) override {}
+ virtual void visit (AST::StructExprTuple &expr) override {}
+ virtual void visit (AST::StructExprUnit &expr) override {}
+ // virtual void visit(EnumExprField& field) override {}
+ virtual void visit (AST::EnumExprFieldIdentifier &field) override {}
+ virtual void visit (AST::EnumExprFieldIdentifierValue &field) override {}
+ virtual void visit (AST::EnumExprFieldIndexValue &field) override {}
+ virtual void visit (AST::EnumExprStruct &expr) override {}
+ virtual void visit (AST::EnumExprTuple &expr) override {}
+ virtual void visit (AST::EnumExprFieldless &expr) override {}
+ virtual void visit (AST::CallExpr &expr) override {}
+ virtual void visit (AST::MethodCallExpr &expr) override {}
+ virtual void visit (AST::FieldAccessExpr &expr) override {}
+ virtual void visit (AST::ClosureExprInner &expr) override {}
+ virtual void visit (AST::BlockExpr &expr) override {}
+ virtual void visit (AST::ClosureExprInnerTyped &expr) override {}
+ virtual void visit (AST::ContinueExpr &expr) override {}
+ virtual void visit (AST::BreakExpr &expr) override {}
+ virtual void visit (AST::RangeFromToExpr &expr) override {}
+ virtual void visit (AST::RangeFromExpr &expr) override {}
+ virtual void visit (AST::RangeToExpr &expr) override {}
+ virtual void visit (AST::RangeFullExpr &expr) override {}
+ virtual void visit (AST::RangeFromToInclExpr &expr) override {}
+ virtual void visit (AST::RangeToInclExpr &expr) override {}
+ virtual void visit (AST::ReturnExpr &expr) override {}
+ virtual void visit (AST::UnsafeBlockExpr &expr) override {}
+ virtual void visit (AST::LoopExpr &expr) override {}
+ virtual void visit (AST::WhileLoopExpr &expr) override {}
+ virtual void visit (AST::WhileLetLoopExpr &expr) override {}
+ virtual void visit (AST::ForLoopExpr &expr) override {}
+ virtual void visit (AST::IfExpr &expr) override {}
+ virtual void visit (AST::IfExprConseqElse &expr) override {}
+ virtual void visit (AST::IfExprConseqIf &expr) override {}
+ virtual void visit (AST::IfExprConseqIfLet &expr) override {}
+ virtual void visit (AST::IfLetExpr &expr) override {}
+ virtual void visit (AST::IfLetExprConseqElse &expr) override {}
+ virtual void visit (AST::IfLetExprConseqIf &expr) override {}
+ virtual void visit (AST::IfLetExprConseqIfLet &expr) override {}
+ // virtual void visit(MatchCase& match_case) override {}
+ // virtual void visit (AST::MatchCaseBlockExpr &match_case) override {}
+ // virtual void visit (AST::MatchCaseExpr &match_case) override {}
+ virtual void visit (AST::MatchExpr &expr) override {}
+ virtual void visit (AST::AwaitExpr &expr) override {}
+ virtual void visit (AST::AsyncBlockExpr &expr) override {}
+
+ // rust-item.h
+ virtual void visit (AST::TypeParam &param) override {}
+ // virtual void visit(WhereClauseItem& item) override {}
+ virtual void visit (AST::LifetimeWhereClauseItem &item) override {}
+ virtual void visit (AST::TypeBoundWhereClauseItem &item) override {}
+ virtual void visit (AST::Method &method) override {}
+ virtual void visit (AST::ModuleBodied &module) override {}
+ virtual void visit (AST::ModuleNoBody &module) override {}
+ virtual void visit (AST::ExternCrate &crate) override {}
+ // virtual void visit(UseTree& use_tree) override {}
+ virtual void visit (AST::UseTreeGlob &use_tree) override {}
+ virtual void visit (AST::UseTreeList &use_tree) override {}
+ virtual void visit (AST::UseTreeRebind &use_tree) override {}
+ virtual void visit (AST::UseDeclaration &use_decl) override {}
+ virtual void visit (AST::Function &function) override {}
+ virtual void visit (AST::TypeAlias &type_alias) override {}
+ virtual void visit (AST::StructStruct &struct_item) override {}
+ virtual void visit (AST::TupleStruct &tuple_struct) override {}
+ virtual void visit (AST::EnumItem &item) override {}
+ virtual void visit (AST::EnumItemTuple &item) override {}
+ virtual void visit (AST::EnumItemStruct &item) override {}
+ virtual void visit (AST::EnumItemDiscriminant &item) override {}
+ virtual void visit (AST::Enum &enum_item) override {}
+ virtual void visit (AST::Union &union_item) override {}
+ virtual void visit (AST::ConstantItem &const_item) override {}
+ virtual void visit (AST::StaticItem &static_item) override {}
+ virtual void visit (AST::TraitItemFunc &item) override {}
+ virtual void visit (AST::TraitItemMethod &item) override {}
+ virtual void visit (AST::TraitItemConst &item) override {}
+ virtual void visit (AST::TraitItemType &item) override {}
+ virtual void visit (AST::Trait &trait) override {}
+ virtual void visit (AST::InherentImpl &impl) override {}
+ virtual void visit (AST::TraitImpl &impl) override {}
+ // virtual void visit(ExternalItem& item) override {}
+ virtual void visit (AST::ExternalStaticItem &item) override {}
+ virtual void visit (AST::ExternalFunctionItem &item) override {}
+ virtual void visit (AST::ExternBlock &block) override {}
+
+ // rust-macro.h
+ virtual void visit (AST::MacroMatchFragment &match) override {}
+ virtual void visit (AST::MacroMatchRepetition &match) override {}
+ virtual void visit (AST::MacroMatcher &matcher) override {}
+ virtual void visit (AST::MacroRulesDefinition &rules_def) override {}
+ virtual void visit (AST::MacroInvocation &macro_invoc) override {}
+ virtual void visit (AST::MetaItemPath &meta_item) override {}
+ virtual void visit (AST::MetaItemSeq &meta_item) override {}
+ virtual void visit (AST::MetaWord &meta_item) override {}
+ virtual void visit (AST::MetaNameValueStr &meta_item) override {}
+ virtual void visit (AST::MetaListPaths &meta_item) override {}
+ virtual void visit (AST::MetaListNameValueStr &meta_item) override {}
+
+ // rust-pattern.h
+ virtual void visit (AST::LiteralPattern &pattern) override {}
+ virtual void visit (AST::IdentifierPattern &pattern) override {}
+ virtual void visit (AST::WildcardPattern &pattern) override {}
+ // virtual void visit(RangePatternBound& bound) override {}
+ virtual void visit (AST::RangePatternBoundLiteral &bound) override {}
+ virtual void visit (AST::RangePatternBoundPath &bound) override {}
+ virtual void visit (AST::RangePatternBoundQualPath &bound) override {}
+ virtual void visit (AST::RangePattern &pattern) override {}
+ virtual void visit (AST::ReferencePattern &pattern) override {}
+ // virtual void visit(StructPatternField& field) override {}
+ virtual void visit (AST::StructPatternFieldTuplePat &field) override {}
+ virtual void visit (AST::StructPatternFieldIdentPat &field) override {}
+ virtual void visit (AST::StructPatternFieldIdent &field) override {}
+ virtual void visit (AST::StructPattern &pattern) override {}
+ // virtual void visit(TupleStructItems& tuple_items) override {}
+ virtual void visit (AST::TupleStructItemsNoRange &tuple_items) override {}
+ virtual void visit (AST::TupleStructItemsRange &tuple_items) override {}
+ virtual void visit (AST::TupleStructPattern &pattern) override {}
+ // virtual void visit(TuplePatternItems& tuple_items) override {}
+ virtual void visit (AST::TuplePatternItemsMultiple &tuple_items) override {}
+ virtual void visit (AST::TuplePatternItemsRanged &tuple_items) override {}
+ virtual void visit (AST::TuplePattern &pattern) override {}
+ virtual void visit (AST::GroupedPattern &pattern) override {}
+ virtual void visit (AST::SlicePattern &pattern) override {}
+
+ // rust-stmt.h
+ virtual void visit (AST::EmptyStmt &stmt) override {}
+ virtual void visit (AST::LetStmt &stmt) override {}
+ virtual void visit (AST::ExprStmtWithoutBlock &stmt) override {}
+ virtual void visit (AST::ExprStmtWithBlock &stmt) override {}
+
+ // rust-type.h
+ virtual void visit (AST::TraitBound &bound) override {}
+ virtual void visit (AST::ImplTraitType &type) override {}
+ virtual void visit (AST::TraitObjectType &type) override {}
+ virtual void visit (AST::ParenthesisedType &type) override {}
+ virtual void visit (AST::ImplTraitTypeOneBound &type) override {}
+ virtual void visit (AST::TraitObjectTypeOneBound &type) override {}
+ virtual void visit (AST::TupleType &type) override {}
+ virtual void visit (AST::NeverType &type) override {}
+ virtual void visit (AST::RawPointerType &type) override {}
+ virtual void visit (AST::ReferenceType &type) override {}
+ virtual void visit (AST::ArrayType &type) override {}
+ virtual void visit (AST::SliceType &type) override {}
+ virtual void visit (AST::InferredType &type) override {}
+ virtual void visit (AST::BareFunctionType &type) override {}
+};
+
+class ArrayTypeVisitor : public BaseTypeVisitor
+{
+public:
+ static AST::ArrayType *Resolve (AST::Type *type)
+ {
+ ArrayTypeVisitor vis;
+ type->accept_vis (vis);
+ return vis.resolved;
+ }
+
+ virtual void visit (AST::ArrayType &type) override { resolved = &type; };
+
+private:
+ ArrayTypeVisitor () : resolved (nullptr) {}
+
+ AST::ArrayType *resolved;
+};
+
+} // namespace Analysis
+} // namespace Rust
+
+#endif // RUST_TYPE_VISITOR_H