compiler: Fix a, b, c := b, a, 1 when a and b already exist.
From-SVN: r192022
This commit is contained in:
Ian Lance Taylor
parent
e1d90a813c
commit
bed6238ce6
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@ -1631,12 +1631,16 @@ Parse::init_vars(const Typed_identifier_list* til, Type* type,
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// Note that INIT was already parsed with the old name bindings, so
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// we don't have to worry that it will accidentally refer to the
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// newly declared variables.
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// newly declared variables. But we do have to worry about a mix of
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// newly declared variables and old variables if the old variables
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// appear in the initializations.
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Expression_list::const_iterator pexpr;
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if (init != NULL)
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pexpr = init->begin();
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bool any_new = false;
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Expression_list* vars = new Expression_list();
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Expression_list* vals = new Expression_list();
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for (Typed_identifier_list::const_iterator p = til->begin();
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p != til->end();
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++p)
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@ -1644,7 +1648,7 @@ Parse::init_vars(const Typed_identifier_list* til, Type* type,
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if (init != NULL)
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go_assert(pexpr != init->end());
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this->init_var(*p, type, init == NULL ? NULL : *pexpr, is_coloneq,
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false, &any_new);
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false, &any_new, vars, vals);
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if (init != NULL)
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++pexpr;
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}
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@ -1652,6 +1656,7 @@ Parse::init_vars(const Typed_identifier_list* til, Type* type,
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go_assert(pexpr == init->end());
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if (is_coloneq && !any_new)
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error_at(location, "variables redeclared but no variable is new");
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this->finish_init_vars(vars, vals, location);
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}
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// See if we need to initialize a list of variables from a function
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@ -1674,13 +1679,15 @@ Parse::init_vars_from_call(const Typed_identifier_list* vars, Type* type,
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Named_object* first_var = NULL;
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unsigned int index = 0;
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bool any_new = false;
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Expression_list* ivars = new Expression_list();
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Expression_list* ivals = new Expression_list();
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for (Typed_identifier_list::const_iterator pv = vars->begin();
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pv != vars->end();
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++pv, ++index)
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{
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Expression* init = Expression::make_call_result(call, index);
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Named_object* no = this->init_var(*pv, type, init, is_coloneq, false,
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&any_new);
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&any_new, ivars, ivals);
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if (this->gogo_->in_global_scope() && no->is_variable())
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{
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@ -1700,6 +1707,8 @@ Parse::init_vars_from_call(const Typed_identifier_list* vars, Type* type,
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if (is_coloneq && !any_new)
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error_at(location, "variables redeclared but no variable is new");
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this->finish_init_vars(ivars, ivals, location);
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return true;
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}
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@ -1725,7 +1734,7 @@ Parse::init_vars_from_map(const Typed_identifier_list* vars, Type* type,
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Typed_identifier_list::const_iterator p = vars->begin();
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Expression* init = type == NULL ? index : NULL;
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Named_object* val_no = this->init_var(*p, type, init, is_coloneq,
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type == NULL, &any_new);
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type == NULL, &any_new, NULL, NULL);
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if (type == NULL && any_new && val_no->is_variable())
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val_no->var_value()->set_type_from_init_tuple();
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Expression* val_var = Expression::make_var_reference(val_no, location);
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@ -1735,7 +1744,7 @@ Parse::init_vars_from_map(const Typed_identifier_list* vars, Type* type,
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if (var_type == NULL)
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var_type = Type::lookup_bool_type();
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Named_object* no = this->init_var(*p, var_type, NULL, is_coloneq, false,
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&any_new);
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&any_new, NULL, NULL);
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Expression* present_var = Expression::make_var_reference(no, location);
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if (is_coloneq && !any_new)
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@ -1790,7 +1799,7 @@ Parse::init_vars_from_receive(const Typed_identifier_list* vars, Type* type,
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Typed_identifier_list::const_iterator p = vars->begin();
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Expression* init = type == NULL ? receive : NULL;
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Named_object* val_no = this->init_var(*p, type, init, is_coloneq,
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type == NULL, &any_new);
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type == NULL, &any_new, NULL, NULL);
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if (type == NULL && any_new && val_no->is_variable())
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val_no->var_value()->set_type_from_init_tuple();
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Expression* val_var = Expression::make_var_reference(val_no, location);
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@ -1800,7 +1809,7 @@ Parse::init_vars_from_receive(const Typed_identifier_list* vars, Type* type,
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if (var_type == NULL)
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var_type = Type::lookup_bool_type();
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Named_object* no = this->init_var(*p, var_type, NULL, is_coloneq, false,
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&any_new);
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&any_new, NULL, NULL);
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Expression* received_var = Expression::make_var_reference(no, location);
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if (is_coloneq && !any_new)
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@ -1857,7 +1866,7 @@ Parse::init_vars_from_type_guard(const Typed_identifier_list* vars,
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if (var_type == NULL)
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var_type = type_guard->type();
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Named_object* val_no = this->init_var(*p, var_type, NULL, is_coloneq, false,
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&any_new);
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&any_new, NULL, NULL);
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Expression* val_var = Expression::make_var_reference(val_no, location);
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++p;
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@ -1865,7 +1874,7 @@ Parse::init_vars_from_type_guard(const Typed_identifier_list* vars,
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if (var_type == NULL)
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var_type = Type::lookup_bool_type();
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Named_object* no = this->init_var(*p, var_type, NULL, is_coloneq, false,
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&any_new);
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&any_new, NULL, NULL);
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Expression* ok_var = Expression::make_var_reference(no, location);
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Expression* texpr = type_guard->expr();
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@ -1904,7 +1913,8 @@ Parse::init_vars_from_type_guard(const Typed_identifier_list* vars,
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Named_object*
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Parse::init_var(const Typed_identifier& tid, Type* type, Expression* init,
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bool is_coloneq, bool type_from_init, bool* is_new)
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bool is_coloneq, bool type_from_init, bool* is_new,
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Expression_list* vars, Expression_list* vals)
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{
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Location location = tid.location();
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@ -1946,9 +1956,9 @@ Parse::init_var(const Typed_identifier& tid, Type* type, Expression* init,
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// like v, ok := x.(int).
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if (!type_from_init && init != NULL)
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{
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Expression *v = Expression::make_var_reference(no, location);
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Statement *s = Statement::make_assignment(v, init, location);
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this->gogo_->add_statement(s);
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go_assert(vars != NULL && vals != NULL);
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vars->push_back(Expression::make_var_reference(no, location));
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vals->push_back(init);
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}
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return no;
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}
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@ -1983,6 +1993,36 @@ Parse::create_dummy_global(Type* type, Expression* init,
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return this->gogo_->add_variable(buf, var);
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}
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// Finish the variable initialization by executing any assignments to
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// existing variables when using :=. These must be done as a tuple
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// assignment in case of something like n, a, b := 1, b, a.
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void
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Parse::finish_init_vars(Expression_list* vars, Expression_list* vals,
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Location location)
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{
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if (vars->empty())
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{
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delete vars;
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delete vals;
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}
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else if (vars->size() == 1)
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{
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go_assert(!this->gogo_->in_global_scope());
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this->gogo_->add_statement(Statement::make_assignment(vars->front(),
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vals->front(),
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location));
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delete vars;
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delete vals;
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}
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else
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{
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go_assert(!this->gogo_->in_global_scope());
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this->gogo_->add_statement(Statement::make_tuple_assignment(vars, vals,
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location));
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}
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}
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// SimpleVarDecl = identifier ":=" Expression .
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// We've already seen the identifier.
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@ -5113,7 +5153,8 @@ Parse::range_clause_decl(const Typed_identifier_list* til,
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bool any_new = false;
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const Typed_identifier* pti = &til->front();
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Named_object* no = this->init_var(*pti, NULL, expr, true, true, &any_new);
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Named_object* no = this->init_var(*pti, NULL, expr, true, true, &any_new,
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NULL, NULL);
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if (any_new && no->is_variable())
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no->var_value()->set_type_from_range_index();
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p_range_clause->index = Expression::make_var_reference(no, location);
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@ -5124,7 +5165,7 @@ Parse::range_clause_decl(const Typed_identifier_list* til,
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{
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pti = &til->back();
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bool is_new = false;
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no = this->init_var(*pti, NULL, expr, true, true, &is_new);
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no = this->init_var(*pti, NULL, expr, true, true, &is_new, NULL, NULL);
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if (is_new && no->is_variable())
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no->var_value()->set_type_from_range_value();
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if (is_new)
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@ -206,8 +206,11 @@ class Parse
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Expression*, bool is_coloneq,
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Location);
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Named_object* init_var(const Typed_identifier&, Type*, Expression*,
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bool is_coloneq, bool type_from_init, bool* is_new);
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bool is_coloneq, bool type_from_init, bool* is_new,
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Expression_list* vars, Expression_list* vals);
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Named_object* create_dummy_global(Type*, Expression*, Location);
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void finish_init_vars(Expression_list* vars, Expression_list* vals,
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Location);
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void simple_var_decl_or_assignment(const std::string&, Location,
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bool may_be_composite_lit,
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Range_clause*, Type_switch*);
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