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compiler: use nil pointer for zero length string constant 

We used to pointlessly set the pointer of a zero length string
constant to point to a zero byte constant.  Instead, just use nil.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/384354
This commit is contained in:
Ian Lance Taylor 2022-02-08 20:16:38 -08:00
parent 70feb6839f
commit 2e2b861e89
2 changed files with 10 additions and 4 deletions
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2
gcc/go/gofrontend/MERGE
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@ -1,4 +1,4 @@
7dffb933d33ff288675c8094d05c31b35cbf7e4d
263e8d2a2ab57c6f2b3035f370d40476bda87c9f
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.

12
gcc/go/gofrontend/expressions.cc
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@ -2123,9 +2123,15 @@ String_expression::do_get_backend(Translate_context* context)
Location loc = this->location();
std::vector<Bexpression*> init(2);
Bexpression* str_cst =
gogo->backend()->string_constant_expression(this->val_);
init[0] = gogo->backend()->address_expression(str_cst, loc);
if (this->val_.size() == 0)
init[0] = gogo->backend()->nil_pointer_expression();
else
{
Bexpression* str_cst =
gogo->backend()->string_constant_expression(this->val_);
init[0] = gogo->backend()->address_expression(str_cst, loc);
}
Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo);
mpz_t lenval;