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Allow only one return

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This commit is contained in:
Eugen Wissner
2025-03-01 00:00:36 +01:00
parent f091344cce
commit 18602d00a1
10 changed files with 39 additions and 198 deletions
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34
include/elna/boot/ast.h
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@ -63,7 +63,6 @@ namespace boot
class assign_statement;
class if_statement;
class while_statement;
class return_statement;
class traits_expression;
class block;
class program;
@ -81,7 +80,6 @@ namespace boot
class dereference_expression;
template<typename T>
class number_literal;
class defer_statement;
/**
* Interface for AST visitors.
@ -98,8 +96,6 @@ namespace boot
virtual void visit(assign_statement *) = 0;
virtual void visit(if_statement *) = 0;
virtual void visit(while_statement *) = 0;
virtual void visit(return_statement *) = 0;
virtual void visit(defer_statement *) = 0;
virtual void visit(block *) = 0;
virtual void visit(program *) = 0;
virtual void visit(binary_expression *) = 0;
@ -138,8 +134,6 @@ namespace boot
virtual void visit(assign_statement *statement) override;
virtual void visit(if_statement *) override;
virtual void visit(while_statement *) override;
virtual void visit(return_statement *) override;
virtual void visit(defer_statement *defer) override;
virtual void visit(block *block) override;
virtual void visit(program *program) override;
virtual void visit(binary_expression *expression) override;
@ -383,9 +377,11 @@ namespace boot
public:
block *const body;
expression *const returning;
procedure_definition(const struct position position, const std::string& identifier,
const bool exported, std::shared_ptr<procedure_type> heading, block *body = nullptr);
const bool exported, std::shared_ptr<procedure_type> heading,
block *const body = nullptr, expression *const returning = nullptr);
virtual void accept(parser_visitor *visitor) override;
procedure_type& heading();
@ -456,19 +452,6 @@ namespace boot
virtual ~conditional_statements();
};
class return_statement : public statement
{
expression *m_return_expression{ nullptr };
public:
return_statement(const struct position position, expression *return_expression);
virtual void accept(parser_visitor *visitor) override;
expression *return_expression();
virtual ~return_statement() override;
};
class designator_expression : public expression
{
public:
@ -661,17 +644,6 @@ namespace boot
}
};
class defer_statement : public statement
{
public:
std::vector<statement *> statements;
defer_statement(const struct position position);
virtual void accept(parser_visitor *visitor) override;
virtual ~defer_statement() override;
};
class binary_expression : public expression
{
expression *m_lhs;

3
include/elna/gcc/elna-generic.h
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@ -61,6 +61,7 @@ namespace gcc
void build_record_call(location_t call_location,
tree symbol, const std::vector<boot::expression *>& arguments);
void visit_statements(const std::vector<boot::statement *>& statements);
void visit_return(boot::expression *const return_expression);
public:
generic_visitor(std::shared_ptr<symbol_table> symbol_table);
@ -90,8 +91,6 @@ namespace gcc
void visit(boot::assign_statement *statement) override;
void visit(boot::if_statement *statement) override;
void visit(boot::while_statement *statement) override;
void visit(boot::return_statement *statement) override;
void visit(boot::defer_statement *statement) override;
};
}
}

2
include/elna/gcc/elna-tree.h
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@ -72,8 +72,6 @@ namespace gcc
bool is_assignable_from(tree assignee, tree assignment);
void append_statement(tree statement_tree);
void defer(tree statement_tree);
tree chain_defer();
tree do_pointer_arithmetic(boot::binary_operator binary_operator, tree left, tree right);
tree build_binary_operation(bool condition, boot::binary_expression *expression,

9
include/elna/gcc/elna1.h
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@ -58,12 +58,6 @@ struct GTY (()) lang_decl
{
};
struct GTY (()) defer_scope
{
tree defer_block;
tree try_statements;
};
struct GTY ((chain_next ("%h.level_chain"))) binding_level
{
// A block chain is needed to call defer statements beloning to each block.
@ -74,9 +68,6 @@ struct GTY ((chain_next ("%h.level_chain"))) binding_level
// Statements before the first defer has been seen.
tree statement_list;
// Defer statement coupled with statements following it.
vec<defer_scope, va_gc> *defers;
};
struct GTY (()) language_function