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compiler: scan all function literals for escape analysis

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We were scanning only function literals with closures, but not all
function literals have closures.

Discovered because compiler failed building 1.15rc1, as there is a
function literal in the runtime package (p1 in hexdumpWords) that has
no closure and, without escape analysis, was forcing a variable to the
heap which is not permitted in the runtime.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/244802
This commit is contained in:
Ian Lance Taylor 2020-07-26 11:08:13 -07:00
parent bc4ed079dc
commit 8939cef951
2 changed files with 19 additions and 12 deletions
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2
gcc/go/gofrontend/MERGE
View File

@ -1,4 +1,4 @@
587d4595e446c597efe97ccdc81b2f05cbc04a21
e86f2cb5d6b1984fde345d6ade605e377fa38c04
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.

29
gcc/go/gofrontend/escape.cc
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@ -142,18 +142,22 @@ Node::ast_format(Gogo* gogo) const
else if (this->expr() != NULL)
{
Expression* e = this->expr();
bool is_call = e->call_expression() != NULL;
if (is_call)
e->call_expression()->fn();
e = e->call_expression()->fn();
Func_expression* fe = e->func_expression();;
bool is_closure = fe != NULL && fe->closure() != NULL;
if (is_closure)
if (fe != NULL)
{
if (is_call)
return "(func literal)()";
return "func literal";
Named_object* no = fe->named_object();
if (no->is_function() && no->func_value()->enclosing() != NULL)
{
if (is_call)
return "(func literal)()";
return "func literal";
}
}
Ast_dump_context::dump_to_stream(this->expr(), &ss);
}
else if (this->statement() != NULL)
@ -1172,11 +1176,14 @@ Escape_discover_expr::expression(Expression** pexpr)
// Method call or function call.
fn = e->call_expression()->fn()->func_expression()->named_object();
}
else if (e->func_expression() != NULL
&& e->func_expression()->closure() != NULL)
else if (e->func_expression() != NULL)
{
// Closure.
fn = e->func_expression()->named_object();
Named_object* no = e->func_expression()->named_object();
if (no->is_function() && no->func_value()->enclosing() != NULL)
{
// Nested function.
fn = no;
}
}
if (fn != NULL)