checker: bugfix for `__global ( cpu_get_id fn () u64 ) ... cpu_get_id()`

Support new vlib/v/checker/tests/globals_run/ folder, for .vv files
that will be run with `-enable-globals run`, and the results will be
compared with their matching `.run.out` files.

Add regression tests.

TESTS.md

@@ -80,8 +80,14 @@ Run `vlib` module tests, *including* the compiler tests.
 ## `v vlib/v/compiler_errors_test.v`
 
 This runs tests for:
-* `checker/tests/*.vv`
+* `vlib/v/checker/tests/*.vv`
-* `parser/tests/*.vv`
+* `vlib/v/parser/tests/*.vv`
+
+### Special folders that compiler_errors_test.v will try to
+run/compile with specific options:
+
+vlib/v/checker/tests/globals_run/ - `-enable-globals run`; 
+results stored in `.run.out` files, matching the .vv ones.
 
 ## `v test-all`
 

vlib/v/checker/checker.v

@@ -2413,6 +2413,7 @@ pub fn (mut c Checker) fn_call(mut call_expr ast.CallExpr) ast.Type {
 			sym := c.table.get_type_symbol(obj.typ)
 			if sym.kind == .function {
 				found = true
+				func = (sym.info as ast.FnType).func
 			}
 		}
 	}

vlib/v/checker/tests/globals_run/function_stored_in_global.run.out

@@ -0,0 +1,4 @@
+[vlib/v/checker/tests/globals_run/function_stored_in_global.vv:14] voidptr(main.abc) == voidptr(cpu_get_id): true
+[vlib/v/checker/tests/globals_run/function_stored_in_global.vv:15] main.cpu_get_id(): 123
+[vlib/v/checker/tests/globals_run/function_stored_in_global.vv:16] abc(): 123
+[vlib/v/checker/tests/globals_run/function_stored_in_global.vv:17] abc() == main.cpu_get_id(): true

vlib/v/checker/tests/globals_run/function_stored_in_global.vv

@@ -0,0 +1,20 @@
+__global (
+	cpu_get_id fn () u64
+)
+fn current() u64 {
+	return cpu_get_id()
+}
+
+fn abc() u64 {
+	return 123
+}
+
+fn main() {
+	cpu_get_id = abc
+	dump(voidptr(abc) == voidptr(cpu_get_id))
+	dump(cpu_get_id())
+	dump(abc())
+	dump(abc() == cpu_get_id())
+	assert abc() == cpu_get_id()
+	assert voidptr(abc) == voidptr(cpu_get_id)
+}

vlib/v/checker/tests/globals_run/global_array_indexed_by_global_fn.run.out

@@ -0,0 +1,3 @@
+[vlib/v/checker/tests/globals_run/global_array_indexed_by_global_fn.vv:30] cpu_locals.map(it.x): [123, 456]
+[vlib/v/checker/tests/globals_run/global_array_indexed_by_global_fn.vv:33] x.x: 123
+[vlib/v/checker/tests/globals_run/global_array_indexed_by_global_fn.vv:36] y.x: 456

vlib/v/checker/tests/globals_run/global_array_indexed_by_global_fn.vv

@@ -0,0 +1,40 @@
+struct Local {
+	x int
+}
+
+__global (
+	cpu_locals []&Local
+)
+
+__global (
+	cpu_get_id fn () u64
+	cpu_set_id fn (u64)
+)
+
+fn abc0() u64 {
+	return 0
+}
+
+fn abc1() u64 {
+	return 1
+}
+
+pub fn current() &Local {
+	return cpu_locals[cpu_get_id()]
+}
+
+fn main() {
+	cpu_locals = []&Local{}
+	cpu_locals << &Local{123}
+	cpu_locals << &Local{456}
+	dump(cpu_locals.map(it.x))
+	cpu_get_id = abc0
+	x := current()
+	dump(x.x)
+	cpu_get_id = abc1
+	y := current()
+	dump(y.x)
+	assert x != y
+	assert x.x == 123
+	assert y.x == 456
+}

vlib/v/compiler_errors_test.v

@@ -57,6 +57,7 @@ fn test_all() {
 	scanner_dir := 'vlib/v/scanner/tests'
 	module_dir := '$checker_dir/modules'
 	global_dir := '$checker_dir/globals'
+	global_run_dir := '$checker_dir/globals_run'
 	run_dir := '$checker_dir/run'
 	skip_unused_dir := 'vlib/v/tests/skip_unused'
 	//
@@ -64,6 +65,7 @@ fn test_all() {
 	parser_tests := get_tests_in_dir(parser_dir, false)
 	scanner_tests := get_tests_in_dir(scanner_dir, false)
 	global_tests := get_tests_in_dir(global_dir, false)
+	global_run_tests := get_tests_in_dir(global_run_dir, false)
 	module_tests := get_tests_in_dir(module_dir, true)
 	run_tests := get_tests_in_dir(run_dir, false)
 	skip_unused_dir_tests := get_tests_in_dir(skip_unused_dir, false)
@@ -77,6 +79,8 @@ fn test_all() {
 	tasks.add('', scanner_dir, '-prod', '.out', scanner_tests, false)
 	tasks.add('', checker_dir, '-enable-globals run', '.run.out', ['globals_error.vv'],
 		false)
+	tasks.add('', global_run_dir, '-enable-globals run', '.run.out', global_run_tests,
+		false)
 	tasks.add('', global_dir, '-enable-globals', '.out', global_tests, false)
 	tasks.add('', module_dir, '-prod run', '.out', module_tests, true)
 	tasks.add('', run_dir, 'run', '.run.out', run_tests, false)