| commit | 1f33ab41eb9228a28350ad8957108acc210b31a0 | |
| author | ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4> | |
| Tue, 9 Jan 2018 21:33:59 +0000 (9 21:33 +0000) | ||
| committer | ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4> | |
| Tue, 9 Jan 2018 21:33:59 +0000 (9 21:33 +0000) | ||
| tree | d85e4d07a55f301cdce0f9af88f503c2cc802899 | treesnapshot (tar.gz zip) |
| parent | 442c4003f392305636769a94843dbc092f045a40 | commitdiff |
compiler: make top-level decl for address-taken non-escaping locals
If a local variable's address is taken and passed out of its
lexical scope, GCC backend may reuse the stack slot for the
variable, not knowing it is still live through a pointer. In
this case, we create a top-level temporary variable and let the
user-defined variable refer to the temporary variable as its
storage location. As the temporary variable is declared at the
top level, its stack slot will remain live throughout the
function.
Reviewed-on: https://go-review.googlesource.com/84675
* go-gcc.cc (local_variable): Add decl_var parameter.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@256398 138bc75d-0d04-0410-961f-82ee72b054a4
If a local variable's address is taken and passed out of its
lexical scope, GCC backend may reuse the stack slot for the
variable, not knowing it is still live through a pointer. In
this case, we create a top-level temporary variable and let the
user-defined variable refer to the temporary variable as its
storage location. As the temporary variable is declared at the
top level, its stack slot will remain live throughout the
function.
Reviewed-on: https://go-review.googlesource.com/84675
* go-gcc.cc (local_variable): Add decl_var parameter.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@256398 138bc75d-0d04-0410-961f-82ee72b054a4