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+/*****
+ * policy.h
+ * Andy Hammerlindl 2011/09/03
+ *
+ * Defines a low-level C interface for interacting with the interpreter and
+ * its datatypes.
+ *****/
+
+// TODO: Wrap in namespace.
+
+typedef long long int_typ;
+
+typedef struct {} handle_base_typ;
+typedef handle_base_typ *handle_typ;
+typedef struct {} arguments_base_typ;
+typedef arguments_base_typ *arguments_typ;
+typedef struct {} state_base_typ;
+typedef state_base_typ *state_typ;
+
+typedef void (*function_typ)(state_typ, void *);
+
+typedef struct {
+ const char *buf;
+ int_typ length;
+} string_typ;
+
+typedef void (*error_callback_typ)(string_typ);
+
+typedef long arg_rest_option;
+#define NORMAL_ARG 45000
+#define REST_ARG 45001
+
+typedef struct {
+ int_typ version;
+
+ handle_typ (*copyHandle)(handle_typ handle);
+ void (*releaseHandle)();
+
+ handle_typ (*handleFromInt)(int_typ x);
+ // For bool, O is false, 1 is true, and no other value is allowed.
+ handle_typ (*handleFromBool)(int_typ x);
+ handle_typ (*handleFromDouble)(double x);
+ handle_typ (*handleFromString)(string_typ x);
+ handle_typ (*handleFromFunction)(const char *signature,
+ function_typ f, void *data);
+
+ int_typ (*IntFromHandle)(handle_typ handle);
+ int_typ (*boolFromHandle)(handle_typ handle);
+ double (*doubleFromHandle)(handle_typ handle);
+ // TODO: Note that a pointer and length are returned, but the pointer is
+ // valid for a limited time only.
+ string_typ (*stringFromHandle)(handle_typ handle);
+
+#if 0
+ bool (*handleIsOverloaded)(handle_typ handle);
+ handle_typ (*signatureless)(handle_typ handle);
+#endif
+
+ handle_typ (*getField)(handle_typ handle, const char *name);
+ handle_typ (*getCell)(handle_typ handle, handle_typ index);
+
+ // Adds a field to a datum (possibly a module) and sets it to an initial
+ // value.
+ // TODO: Change name to sig.
+ void (*addField)(handle_typ handle,
+ const char *name, handle_typ init);
+
+ arguments_typ (*newArguments)();
+ void (*releaseArguments)(arguments_typ args);
+ void (*addArgument)(arguments_typ args, const char *name, handle_typ handle,
+ arg_rest_option at);
+ handle_typ (*call)(handle_typ callee, arguments_typ args);
+
+ handle_typ (*globals)(state_typ state);
+ int_typ (*numParams)(state_typ state);
+ handle_typ (*getParam)(state_typ state, int_typ index);
+ void (*setReturnValue)(state_typ state, handle_typ handle);
+
+ // Allows the user sets an error callback, which is called on any error.
+ void (*setErrorCallback)(error_callback_typ callback);
+} policy_typ;
+
+