various samples and experiments

samples/import_contract.c

@@ -0,0 +1,43 @@
+int data;
+
+extern void log_event(void* ptr);
+
+int main() {
+    log_event(0);
+}
+
+void call() {
+  log_event(0);
+}
+
+/* produces the following code (with gas counter and call optimization)
+(module
+  (type (;0;) (func (param i32) (result i32)))
+  (type (;1;) (func))
+  (type (;2;) (func (param i32)))
+  (import "env" "memoryBase" (global (;0;) i32))
+  (import "env" "memory" (memory (;0;) 256))
+  (import "env" "table" (table (;0;) 0 anyfunc))
+  (import "env" "gas" (func (;0;) (type 2)))
+  (func (;1;) (type 0) (param i32) (result i32)
+    i32.const 2
+    call 0
+    block i32  ;; label = @1
+      i32.const 13
+      call 0
+      get_global 0
+      i32.const 5242880
+      i32.add
+      get_global 0
+      i32.const 5242880
+      i32.add
+      i32.load
+      get_local 0
+      i32.load offset=4
+      i32.add
+      i32.store
+      i32.const 0
+    end)
+  (export "_call" (func 1)))
+
+*/