wip: begin dynamic library loading dev

CMakeLists.txt

@@ -3,7 +3,6 @@ project(fz-lang
 	LANGUAGES C)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-set(BUILD_SHARED_LIBS OFF)
 add_compile_options(-Wall -Wextra -Werror=implicit-function-declaration)
 
 if (CMAKE_BUILD_TYPE STREQUAL "Debug")

include/common/fzl_types.h

@@ -6,6 +6,8 @@ typedef enum
   FZL_TYPE_NULL,
   FZL_TYPE_OBJECT,
 
+  FZL_TYPE_EXTERN_FN,
+
   FZL_TYPE_STRING,
   FZL_TYPE_CHAR,
   FZL_TYPE_BOOL,

include/vm/fzl_vm.h

@@ -6,6 +6,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <vm/fzl_vm_env.h>
+#include <vm/fzl_vm_extern.h>
 #include <vm/fzl_vm_object.h>
 
 // VM descriptor
@@ -14,6 +15,9 @@ typedef struct
   fzl_const_t *consts;
   size_t consts_count;
 
+  fzl_vm_extern_t *externs;
+  size_t externs_count;
+
   uint64_t *ops;
   size_t ops_count;
 

include/vm/fzl_vm_extern.h

@@ -0,0 +1,14 @@
+#ifndef FZL_VM_EXTERN_H
+#define FZL_VM_EXTERN_H
+
+#include <ffi.h>
+
+// Loaded extern function definition
+typedef struct
+{
+  void *func_ptr;
+  ffi_cif cif;
+  ffi_type **arg_types;
+} fzl_vm_extern_t;
+
+#endif // FZL_VM_EXTERN_H

src/stdlib/bindings/conv.fzs

@@ -0,0 +1,6 @@
+/// Converts integer [value] to string
+extern fn itos(int value) str;
+
+/// Converts string [value] to integer
+extern fn stoi(str value) int;
+

src/stdlib/bindings/math.fzs

@@ -0,0 +1,6 @@
+/// Get the minimum of specified values
+extern fn min([]int ...values) int;
+
+/// Get the maximum of specified values
+extern fn max([]int ...values) int;
+

src/vm/fzl_vm.c

@@ -28,14 +28,16 @@ fzl_vm_t *fzl_mkvm(const char *filepath)
     return NULL;
   }
 
-  vm->consts       = NULL;
-  vm->consts_count = 0;
-  vm->ops          = NULL;
-  vm->ops_count    = 0;
-  vm->ip           = 0;
-  vm->dtop         = 0;
-  vm->ctop         = 0;
-  vm->etop         = 0;
+  vm->consts        = NULL;
+  vm->consts_count  = 0;
+  vm->ops           = NULL;
+  vm->ops_count     = 0;
+  vm->externs       = NULL;
+  vm->externs_count = 0;
+  vm->ip            = 0;
+  vm->dtop          = 0;
+  vm->ctop          = 0;
+  vm->etop          = 0;
 
   memset(vm->dstack, 0, sizeof(vm->dstack));
   memset(vm->cstack, 0, sizeof(vm->cstack));
@@ -63,6 +65,7 @@ fzl_vm_t *fzl_mkvm(const char *filepath)
   size_t consts_count, ops_count;
   fread(&consts_count, sizeof(size_t), 1, fd);
   fread(&ops_count, sizeof(size_t), 1, fd);
+  // TODO: read externs count
 
   if (ops_count < 1)
   {
@@ -116,6 +119,8 @@ fzl_vm_t *fzl_mkvm(const char *filepath)
     fread(&op, sizeof(uint64_t), 1, fd);
     vm->ops[i] = op;
   }
+
+  // TODO: read externs
   fclose(fd);
 
   return vm;