/**********************************************************************************************************************/
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/*wasm interpreter*/
/*Copyright (C) 2018 Farzad Sadeghi

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
USA.*/
/**********************************************************************************************************************/
#ifndef WASM_H
#define WASM_H
#include <inttypes.h>
//#include <Python.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef uint8_t varint1;
typedef uint8_t varint7;
typedef uint32_t varint32;
typedef int8_t varuint1;
typedef int8_t varuint7;
typedef int32_t varuint32;

enum value_type_t { f64_vt = -4, f32_vt, i64_vt, i32_vt };
enum external_kind_t { Function, Table, Memory, Global };
enum type_ctor_t {
  i32_ctor = -1,
  i64_ctor = -2,
  f32_ctor = -3,
  f64_ctor = -4,
  anyfunc_ctor = -16,
  func_ctor = -32,
  block_type_ctor = -64
};

typedef struct {
  varuint32 size;
  char *code;
} init_expr_t;

typedef struct {
  varuint1 flags;
  varuint32 initial;
  varuint32 maximum;
} resizable_limit_t;

typedef struct {
  enum value_type_t value_type;
  varuint1 mutability;
} global_type_t;

typedef struct {
  varint7 element_type;
  resizable_limit_t *resizable_limit;
} table_type_t;

typedef struct {
  resizable_limit_t *resizable_limit;
} memory_type_t;

// func_type
typedef struct {
  varint7 form;
  varuint32 param_count;
  varint7 *param_types;
  varuint1 return_count;
  varint7 *return_types;
} W_Type_Section_Entry;

typedef struct {
  varuint32 count;
  W_Type_Section_Entry **entries;
} W_Type_Section;

typedef struct {
  varuint32 module_length;
  char *module_str;
  varuint32 field_len;
  char *field_str;
  enum external_kind_t kind;
  // based on external_kind it can be 4 different types. thats why im casting to
  // void*.
  void *type;
} W_Import_Section_Entry;

typedef struct {
  varuint32 count;
  W_Import_Section_Entry **entries;
} W_Import_Section;

typedef struct {
  varuint32 count;
  // indexes into the type section
  varuint32 *types;
} W_Function_Section;

typedef struct W_Table_Section {
  varuint32 count;
  table_type_t **entries;
} W_Table_Section;

typedef struct {
  varuint32 count;
  memory_type_t **entries;
} W_Memory_Section;

typedef struct {
  global_type_t *type;
  init_expr_t *init;
} W_Global_Entry;

typedef struct {
  varuint32 count;
  W_Global_Entry **globals;
} W_Global_Section;

typedef struct {
  varuint32 field_len;
  char *field_str;
  enum external_kind_t kind;
  varuint32 index;
} W_Export_Entry;

typedef struct {
  int count;
  W_Export_Entry **entries;
} W_Export_Section;

typedef struct {
  varuint32 index;
} W_Start_Section;

typedef struct {
  varuint32 index;
  init_expr_t *offset;
  varuint32 num_length;
  varuint32 *elems;
} W_Elem_Segment;

typedef struct {
  varuint32 count;
  W_Elem_Segment **entries;
} W_Element_Section;

typedef struct {
  varuint32 count;
  enum value_type_t type;
} W_Local_Entry;

typedef struct W_Function_Body {
  varuint32 body_size;
  varuint32 local_count;
  W_Local_Entry **locals;
  char *code;
  // char end = 0x0b;
} W_Function_Body;

typedef struct {
  varuint32 count;
  W_Function_Body **bodies;
} W_Code_Section;

typedef struct {
  varuint32 index;
  init_expr_t *offset;
  varuint32 size;
  char *data;
} W_Data_Segment;

typedef struct {
  varuint32 count;
  W_Data_Segment **entries;
} W_Data_Section;

#if 0
  typedef struct W_Custom_Section {};
  typedef struct W_Name_Section {};
  typedef struct W_Relocation_Section {};
#endif

typedef struct Wasm_Module {
  W_Type_Section *type_section;
  W_Import_Section *import_section;
  W_Function_Section *function_section;
  W_Table_Section *table_section;
  W_Memory_Section *memory_section;
  W_Global_Section *global_section;
  W_Export_Section *export_section;
  W_Start_Section *start_section;
  W_Element_Section *element_section;
  W_Code_Section *code_section;
  W_Data_Section *data_section;
  void **W_Custom_Sections;
  char *name;
} Wasm_Module;

// get the raw binary of the wasm module
// char* getWRaw();

// get wasm section raw binary by name
// char* get_W_Section_Raw(const char* section_name);

#ifdef __cplusplus
}
#endif // end of extern c
#endif // end of header guard
/**********************************************************************************************************************/
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