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Define a base class for all AST nodes. (#947)

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Also implement code-generation to manage the resulting boilerplate.
This commit is contained in:
Geoff Romer
2021-11-16 11:54:47 -08:00
committed by GitHub
parent d854fb93cb
commit 7a5b8434c8
24 changed files with 965 additions and 543 deletions
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executable_semantics/ast/pattern.cpp
+9 -7
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@@ -17,12 +17,14 @@ namespace Carbon {
using llvm::cast;
Pattern::~Pattern() = default;
void Pattern::Print(llvm::raw_ostream& out) const {
switch (kind()) {
case Kind::AutoPattern:
case PatternKind::AutoPattern:
out << "auto";
break;
case Kind::BindingPattern: {
case PatternKind::BindingPattern: {
const auto& binding = cast<BindingPattern>(*this);
if (binding.name().has_value()) {
out << *binding.name();
@@ -32,7 +34,7 @@ void Pattern::Print(llvm::raw_ostream& out) const {
out << ": " << binding.type();
break;
}
case Kind::TuplePattern: {
case PatternKind::TuplePattern: {
const auto& tuple = cast<TuplePattern>(*this);
out << "(";
llvm::ListSeparator sep;
@@ -42,13 +44,13 @@ void Pattern::Print(llvm::raw_ostream& out) const {
out << ")";
break;
}
case Kind::AlternativePattern: {
case PatternKind::AlternativePattern: {
const auto& alternative = cast<AlternativePattern>(*this);
out << alternative.choice_type() << "." << alternative.alternative_name()
<< alternative.arguments();
break;
}
case Kind::ExpressionPattern:
case PatternKind::ExpressionPattern:
out << cast<ExpressionPattern>(*this).expression();
break;
}
@@ -77,7 +79,7 @@ auto TuplePatternFromParenContents(Nonnull<Arena*> arena,
// apply.
static auto RequireFieldAccess(Nonnull<Expression*> alternative)
-> FieldAccessExpression& {
if (alternative->kind() != Expression::Kind::FieldAccessExpression) {
if (alternative->kind() != ExpressionKind::FieldAccessExpression) {
FATAL_PROGRAM_ERROR(alternative->source_loc())
<< "Alternative pattern must have the form of a field access.";
}
@@ -87,7 +89,7 @@ static auto RequireFieldAccess(Nonnull<Expression*> alternative)
AlternativePattern::AlternativePattern(SourceLocation source_loc,
Nonnull<Expression*> alternative,
Nonnull<TuplePattern*> arguments)
: Pattern(Kind::AlternativePattern, source_loc),
: AstNode(AstNodeKind::AlternativePattern, source_loc),
choice_type_(&RequireFieldAccess(alternative).aggregate()),
alternative_name_(RequireFieldAccess(alternative).field()),
arguments_(arguments) {}