fix: add gc dummy mutex

runtime/internal/lib/runtime/runtime2.go

@@ -4,8 +4,6 @@
 
 package runtime
 
-import "runtime"
-
 // Layout of in-memory per-function information prepared by linker
 // See https://golang.org/s/go12symtab.
 // Keep in sync with linker (../cmd/link/internal/ld/pcln.go:/pclntab)
@@ -30,10 +28,6 @@ func StopTrace() {
 	panic("todo: runtime.StopTrace")
 }
 
-func ReadMemStats(m *runtime.MemStats) {
-	panic("todo: runtime.ReadMemStats")
-}
-
 func SetMutexProfileFraction(rate int) int {
 	panic("todo: runtime.SetMutexProfileFraction")
 }

runtime/internal/lib/runtime/runtime_gc.go

@@ -2,7 +2,15 @@
 
 package runtime
 
-import "github.com/goplus/llgo/runtime/internal/clite/bdwgc"
+import (
+	"runtime"
+
+	"github.com/goplus/llgo/runtime/internal/clite/bdwgc"
+)
+
+func ReadMemStats(m *runtime.MemStats) {
+	panic("todo: runtime.ReadMemStats")
+}
 
 func GC() {
 	bdwgc.Gcollect()

runtime/internal/lib/runtime/runtime_gc_baremetal.go

@@ -2,7 +2,25 @@
 
 package runtime
 
-import "github.com/goplus/llgo/runtime/internal/runtime/tinygogc"
+import (
+	"runtime"
+
+	"github.com/goplus/llgo/runtime/internal/runtime/tinygogc"
+)
+
+func ReadMemStats(m *runtime.MemStats) {
+	stats := tinygogc.ReadGCStats()
+	m.StackInuse = stats.StackInuse
+	m.StackSys = stats.StackSys
+	m.HeapSys = stats.HeapSys
+	m.GCSys = stats.GCSys
+	m.TotalAlloc = stats.TotalAlloc
+	m.Mallocs = stats.Mallocs
+	m.Frees = stats.Frees
+	m.Sys = stats.Sys
+	m.HeapAlloc = stats.HeapAlloc
+	m.Alloc = stats.Alloc
+}
 
 func GC() {
 	tinygogc.GC()