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Don't crash on type switch of nil.

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From-SVN: r170455
This commit is contained in:
Ian Lance Taylor 2011-02-24 03:53:10 +00:00
parent d6007535e6
commit 6540ddba79
1 changed files with 5 additions and 2 deletions
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7
gcc/go/gofrontend/statements.cc
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@ -3905,10 +3905,13 @@ Type_switch_statement::do_lower(Gogo*, Block* enclosing)
{
// Doing a type switch on a non-interface type. Should we issue
// a warning for this case?
// descriptor_temp = DESCRIPTOR
Expression* lhs = Expression::make_temporary_reference(descriptor_temp,
loc);
Expression* rhs = Expression::make_type_descriptor(val_type, loc);
Expression* rhs;
if (val_type->is_nil_type())
rhs = Expression::make_nil(loc);
else
rhs = Expression::make_type_descriptor(val_type, loc);
Statement* s = Statement::make_assignment(lhs, rhs, loc);
b->add_statement(s);
}