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Code Issues Packages Projects Releases 10 Wiki Activity

Switch Action to use inheritance+cast (#711)

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This commit is contained in:
Jon Meow
2021-08-06 15:14:29 -07:00
committed by GitHub
parent c1148caf7d
commit 4b2346cfcd
3 changed files with 376 additions and 354 deletions
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executable_semantics/interpreter/action.cpp
+13 -60
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@@ -15,75 +15,28 @@
#include "executable_semantics/common/arena.h"
#include "executable_semantics/interpreter/stack.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Casting.h"
namespace Carbon {
auto Action::MakeLValAction(const Expression* e) -> Action* {
auto* act = global_arena->New<Action>();
act->value = LValAction({.exp = e});
return act;
}
auto Action::MakeExpressionAction(const Expression* e) -> Action* {
auto* act = global_arena->New<Action>();
act->value = ExpressionAction({.exp = e});
return act;
}
auto Action::MakePatternAction(const Pattern* p) -> Action* {
auto* act = global_arena->New<Action>();
act->value = PatternAction({.pattern = p});
return act;
}
auto Action::MakeStatementAction(const Statement* s) -> Action* {
auto* act = global_arena->New<Action>();
act->value = StatementAction({.stmt = s});
return act;
}
auto Action::MakeValAction(const Value* v) -> Action* {
auto* act = global_arena->New<Action>();
act->value = ValAction({.val = v});
return act;
}
auto Action::GetLValAction() const -> const LValAction& {
return std::get<LValAction>(value);
}
auto Action::GetExpressionAction() const -> const ExpressionAction& {
return std::get<ExpressionAction>(value);
}
auto Action::GetPatternAction() const -> const PatternAction& {
return std::get<PatternAction>(value);
}
auto Action::GetStatementAction() const -> const StatementAction& {
return std::get<StatementAction>(value);
}
auto Action::GetValAction() const -> const ValAction& {
return std::get<ValAction>(value);
}
using llvm::cast;
void Action::Print(llvm::raw_ostream& out) const {
switch (tag()) {
case ActionKind::LValAction:
out << *GetLValAction().exp;
switch (Tag()) {
case Action::Kind::LValAction:
out << *cast<LValAction>(*this).Exp();
break;
case ActionKind::ExpressionAction:
out << *GetExpressionAction().exp;
case Action::Kind::ExpressionAction:
out << *cast<ExpressionAction>(*this).Exp();
break;
case ActionKind::PatternAction:
out << *GetPatternAction().pattern;
case Action::Kind::PatternAction:
out << *cast<PatternAction>(*this).Pat();
break;
case ActionKind::StatementAction:
GetStatementAction().stmt->PrintDepth(1, out);
case Action::Kind::StatementAction:
cast<StatementAction>(*this).Stmt()->PrintDepth(1, out);
break;
case ActionKind::ValAction:
out << *GetValAction().val;
case Action::Kind::ValAction:
out << *cast<ValAction>(*this).Val();
break;
}
out << "<" << pos << ">";