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/**********************************************************************

  yarvcore.h - 

  $Author$
  $Date$
  created at: 04/01/01 19:41:38 JST

  Copyright (C) 2004-2006 Koichi Sasada

**********************************************************************/

#ifndef _YARVCORE_H_INCLUDED_
#define _YARVCORE_H_INCLUDED_

#define RUBY_VM_THREAD_MODEL 2

#include <setjmp.h>

#include "ruby/ruby.h"
#include "ruby/signal.h"
#include "ruby/st.h"
#include "ruby/node.h"

#include "debug.h"
#include "vm_opts.h"

#if   defined(_WIN32)
#include "thread_win32.h"
#elif defined(HAVE_PTHREAD_H)
#include "thread_pthread.h"
#else
#error "unsupported thread type"
#endif

#include <signal.h>

#ifndef NSIG
# ifdef DJGPP
#  define NSIG SIGMAX
# else
#  define NSIG (_SIGMAX + 1)      /* For QNX */
# endif
#endif

#define RUBY_NSIG NSIG

/*****************/
/* configuration */
/*****************/

/* gcc ver. check */
#if defined(__GNUC__) && __GNUC__ >= 2

#if OPT_TOKEN_THREADED_CODE
#if OPT_DIRECT_THREADED_CODE
#undef OPT_DIRECT_THREADED_CODE
#endif
#endif

#else /* defined(__GNUC__) && __GNUC__ >= 2 */

/* disable threaded code options */
#if OPT_DIRECT_THREADED_CODE
#undef OPT_DIRECT_THREADED_CODE
#endif
#if OPT_TOKEN_THREADED_CODE
#undef OPT_TOKEN_THREADED_CODE
#endif
#endif

/* call threaded code */
#if    OPT_CALL_THREADED_CODE
#if    OPT_DIRECT_THREADED_CODE
#undef OPT_DIRECT_THREADED_CODE
#endif /* OPT_DIRECT_THREADED_CODE */
#if    OPT_STACK_CACHING
#undef OPT_STACK_CACHING
#endif /* OPT_STACK_CACHING */
#define YARV_AOT_COMPILED 1
#endif /* OPT_CALL_THREADED_CODE */

/* likely */
#if __GNUC__ >= 3
#define LIKELY(x)   (__builtin_expect((x), 1))
#define UNLIKELY(x) (__builtin_expect((x), 0))
#else /* __GNUC__ >= 3 */
#define LIKELY(x)   (x)
#define UNLIKELY(x) (x)
#endif /* __GNUC__ >= 3 */

#define YARVDEBUG 0
#define CPDEBUG   0
#define VMDEBUG   0
#define GCDEBUG   0


/* classes and modules */

extern VALUE symIFUNC;
extern VALUE symCFUNC;

/* special id */
extern ID idPLUS;
extern ID idMINUS;
extern ID idMULT;
extern ID idDIV;
extern ID idMOD;
extern ID idLT;
extern ID idLTLT;
extern ID idLE;
extern ID idGT;
extern ID idGE;
extern ID idEq;
extern ID idEqq;
extern ID idBackquote;
extern ID idEqTilde;
extern ID idThrowState;
extern ID idAREF;
extern ID idASET;
extern ID idIntern;
extern ID idMethodMissing;
extern ID idLength;
extern ID idGets;
extern ID idSucc;
extern ID idEach;
extern ID idLambda;
extern ID idRangeEachLT;
extern ID idRangeEachLE;
extern ID idArrayEach;
extern ID idTimes;
extern ID idEnd;
extern ID idBitblt;
extern ID idAnswer;
extern ID idSvarPlaceholder;
extern ID idSend;
extern ID id__send__;
extern ID id__send;
extern ID idFuncall;
extern ID id__send_bang;


struct insn_info_struct {
    unsigned short position;
    unsigned short line_no;
};

#define ISEQ_TYPE_TOP    INT2FIX(1)
#define ISEQ_TYPE_METHOD INT2FIX(2)
#define ISEQ_TYPE_BLOCK  INT2FIX(3)
#define ISEQ_TYPE_CLASS  INT2FIX(4)
#define ISEQ_TYPE_RESCUE INT2FIX(5)
#define ISEQ_TYPE_ENSURE INT2FIX(6)
#define ISEQ_TYPE_EVAL   INT2FIX(7)
#define ISEQ_TYPE_DEFINED_GUARD INT2FIX(8)

#define CATCH_TYPE_RESCUE INT2FIX(1)
#define CATCH_TYPE_ENSURE INT2FIX(2)
#define CATCH_TYPE_RETRY  INT2FIX(3)
#define CATCH_TYPE_BREAK  INT2FIX(4)
#define CATCH_TYPE_REDO   INT2FIX(5)
#define CATCH_TYPE_NEXT   INT2FIX(6)

struct catch_table_entry {
    VALUE type;
    VALUE iseq;
    unsigned long start;
    unsigned long end;
    unsigned long cont;
    unsigned long sp;
};

#define INITIAL_ISEQ_COMPILE_DATA_STORAGE_BUFF_SIZE (512)

struct iseq_compile_data_storage {
    struct iseq_compile_data_storage *next;
    unsigned long pos;
    unsigned long size;
    char *buff;
};

struct iseq_compile_data_ensure_node_stack;

typedef struct rb_compile_option_struct {
    int inline_const_cache;
    int peephole_optimization;
    int tailcall_optimization;
    int specialized_instruction;
    int operands_unification;
    int instructions_unification;
    int stack_caching;
    int trace_instruction;
} rb_compile_option_t;

struct iseq_compile_data {
    /* GC is needed */
    VALUE err_info;
    VALUE mark_ary;
    VALUE catch_table_ary;	/* Array */

    /* GC is not needed */
    struct iseq_label_data *start_label;
    struct iseq_label_data *end_label;
    struct iseq_label_data *redo_label;
    VALUE current_block;
    VALUE loopval_popped;	/* used by NODE_BREAK */
    VALUE ensure_node;
    VALUE for_iseq;
    struct iseq_compile_data_ensure_node_stack *ensure_node_stack;
    int cached_const;
    struct iseq_compile_data_storage *storage_head;
    struct iseq_compile_data_storage *storage_current;
    int last_line;
    const rb_compile_option_t *option;
};

#define GetISeqPtr(obj, ptr) Data_Get_Struct(obj, rb_iseq_t, ptr)

typedef struct rb_iseq_profile_struct {
    VALUE count;
    VALUE time_self;
    VALUE time_cumu; /* cumulative */
} rb_iseq_profile_t;

struct rb_iseq_struct;

struct rb_iseq_struct {
    /* instruction sequence type */
    VALUE type;

    VALUE self;
    VALUE name;			/* String: iseq name */
    VALUE *iseq;		/* iseq */
    VALUE *iseq_encoded;
    VALUE iseq_mark_ary;	/* Array: includes operands which should be GC marked */

    /* sequence size */
    unsigned long size;

    /* insn info, must be freed */
    struct insn_info_struct *insn_info_tbl;

    /* insn info size, this value shows also instruction count */
    unsigned int insn_info_size;

    /* file information where this sequence from */
    VALUE filename;

    ID *local_table;		/* must free */
    int local_table_size;

    /* method, class frame: sizeof(vars) + 1, block frame: sizeof(vars) */
    int local_size;

    /* jit compiled or not */
    void *jit_compiled;
    void *iseq_orig;

    /**
     * argument information
     *
     *  def m(a1, a2, ..., aM, b1=(...), b2=(...), ..., bN=(...), *c, &d)
     * =>
     *
     *  argc          = M
     *  arg_rest      = M+N + 1 // if no rest arguments, rest is 0
     *  arg_opts      = N
     *  arg_opts_tbl  = [ (N entries) ]
     *  arg_block     = M+N + 1 (rest) + 1 (block)
     *  check:
     *    M <= num
     */

    int argc;
    int arg_simple;
    int arg_rest;
    int arg_block;
    int arg_opts;
    int arg_post_len;
    int arg_post_start;
    int arg_size;

    VALUE *arg_opt_tbl;

    /* for stack overflow check */
    int stack_max;

    /* klass/module nest information stack (cref) */
    NODE *cref_stack;
    VALUE klass;

    /* catch table */
    struct catch_table_entry *catch_table;
    int catch_table_size;

    /* for child iseq */
    struct rb_iseq_struct *parent_iseq;
    struct rb_iseq_struct *local_iseq;

    /* block inlining */
    NODE *node;
    void *special_block_builder;
    void *cached_special_block_builder;
    VALUE cached_special_block;

    /* misc */
    ID defined_method_id;	/* for define_method */
    rb_iseq_profile_t profile;

    struct iseq_compile_data *compile_data;
};

typedef struct rb_iseq_struct rb_iseq_t;

#define RUBY_EVENT_NONE     0x00
#define RUBY_EVENT_LINE     0x01
#define RUBY_EVENT_CLASS    0x02
#define RUBY_EVENT_END      0x04
#define RUBY_EVENT_CALL     0x08
#define RUBY_EVENT_RETURN   0x10
#define RUBY_EVENT_C_CALL   0x20
#define RUBY_EVENT_C_RETURN 0x40
#define RUBY_EVENT_RAISE    0x80
#define RUBY_EVENT_ALL      0xff
#define RUBY_EVENT_VM      0x100
#define RUBY_EVENT_SWITCH  0x200

typedef unsigned int rb_event_flag_t;
typedef void (*rb_event_hook_func_t)(rb_event_flag_t, VALUE data, VALUE, ID, VALUE klass);

typedef struct rb_event_hook_struct {
    rb_event_flag_t flag;
    rb_event_hook_func_t func;
    VALUE data;
    struct rb_event_hook_struct *next;
} rb_event_hook_t;


#define GetVMPtr(obj, ptr) \
  Data_Get_Struct(obj, rb_vm_t, ptr)

typedef struct rb_vm_struct {
    VALUE self;

    rb_thread_lock_t global_interpreter_lock;

    struct rb_thread_struct *main_thread;
    struct rb_thread_struct *running_thread;

    st_table *living_threads;
    VALUE thgroup_default;
    VALUE last_status; /* $? */

    int thread_abort_on_exception;
    unsigned long trace_flag;

    /* object management */
    VALUE mark_object_ary;

    /* load */
    VALUE loaded_features;
    struct st_table *loading_table;
    
    /* signal */
    rb_atomic_t signal_buff[RUBY_NSIG];
    rb_atomic_t bufferd_signal_size;

    /* hook */
    rb_event_hook_t *event_hooks;
} rb_vm_t;

typedef struct {
    VALUE *pc;			/* cfp[0] */
    VALUE *sp;			/* cfp[1] */
    VALUE *bp;			/* cfp[2] */
    rb_iseq_t *iseq;		/* cfp[3] */
    VALUE magic;		/* cfp[4] */
    VALUE self;			/* cfp[5] / block[0] */
    VALUE *lfp;			/* cfp[6] / block[1] */
    VALUE *dfp;			/* cfp[7] / block[2] */
    rb_iseq_t *block_iseq;	/* cfp[8] / block[3] */
    VALUE proc;			/* cfp[9] / block[4] */
    ID method_id;               /* cfp[10] saved in special case */
    VALUE method_klass;         /* cfp[11] saved in special case */
    VALUE prof_time_self;       /* cfp[12] */
    VALUE prof_time_chld;       /* cfp[13] */
} rb_control_frame_t;

typedef struct {
    VALUE self;			/* share with method frame if it's only block */
    VALUE *lfp;			/* share with method frame if it's only block */
    VALUE *dfp;			/* share with method frame if it's only block */
    rb_iseq_t *iseq;
    VALUE proc;
} rb_block_t;

#define GetThreadPtr(obj, ptr) \
  Data_Get_Struct(obj, rb_thread_t, ptr)

enum rb_thread_status {
    THREAD_TO_KILL,
    THREAD_RUNNABLE,
    THREAD_STOPPED,
    THREAD_KILLED,
};

typedef jmp_buf rb_jmpbuf_t;

struct rb_vm_tag {
    rb_jmpbuf_t buf;
    VALUE tag;
    VALUE retval;
    struct rb_vm_tag *prev;
};

struct rb_vm_trap_tag {
    struct rb_vm_trap_tag *prev;
};

#define RUBY_VM_VALUE_CACHE_SIZE 0x1000
#define USE_VALUE_CACHE 0

struct rb_thread_struct
{
    VALUE self;
    rb_vm_t *vm;

    /* execution information */
    VALUE *stack;		/* must free, must mark */
    unsigned long stack_size;
    rb_control_frame_t *cfp;
    int safe_level;
    int raised_flag;
    
    /* passing state */
    int state;

    /* for rb_iterate */
    rb_block_t *passed_block;

    /* for load(true) */
    VALUE top_self;
    VALUE top_wrapper;

    /* eval env */
    rb_block_t *base_block;

    VALUE *local_lfp;
    VALUE local_svar;

    /* thread control */
    rb_thread_id_t thread_id;
    enum rb_thread_status status;
    int priority;

    native_thread_data_t native_thread_data;

    VALUE thgroup;
    VALUE value;

    VALUE errinfo;
    VALUE thrown_errinfo;
    int exec_signal;

    int interrupt_flag;
    rb_unblock_function_t *unblock_function;
    rb_thread_lock_t interrupt_lock;

    struct rb_vm_tag *tag;
    struct rb_vm_trap_tag *trap_tag;

    int parse_in_eval;

    /* storage */
    st_table *local_storage;
#if USE_VALUE_CACHE
    VALUE value_cache[RUBY_VM_VALUE_CACHE_SIZE + 1];
    VALUE *value_cache_ptr;
#endif

    struct rb_thread_struct *join_list_next;
    struct rb_thread_struct *join_list_head;

    VALUE first_proc;
    VALUE first_args;
    VALUE (*first_func)(ANYARGS);
    void *first_func_arg;

    /* for GC */
    VALUE *machine_stack_start;
    VALUE *machine_stack_end;
#ifdef __ia64
    VALUE *machine_register_stack_start;
    VALUE *machine_register_stack_end;
#endif
    jmp_buf machine_regs;
    int mark_stack_len;

    /* statistics data for profiler */
    VALUE stat_insn_usage;

    /* tracer */
    rb_event_hook_t *event_hooks;
    rb_event_flag_t event_flags;
    int tracing;

    /* fiber */
    VALUE fiber;
    VALUE root_fiber;
    rb_jmpbuf_t root_jmpbuf;

    /* misc */
    int method_missing_reason;
    int abort_on_exception;
};

/** node -> yarv instruction sequence object */
VALUE rb_iseq_compile(VALUE self, NODE *node);
VALUE rb_iseq_new(NODE*, VALUE, VALUE, VALUE, VALUE);
VALUE rb_iseq_new_with_bopt(NODE*, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE rb_iseq_new_with_opt(NODE*, VALUE, VALUE, VALUE, VALUE, const rb_compile_option_t*);

/** disassemble instruction sequence */
VALUE ruby_iseq_disasm(VALUE self);
VALUE ruby_iseq_disasm_insn(VALUE str, VALUE *iseqval, int pos,
			    rb_iseq_t *iseq, VALUE child);
char *ruby_node_name(int node);


/* each thread has this size stack : 2MB */
#define RUBY_VM_THREAD_STACK_SIZE (128 * 1024)


/* from ruby 1.9 variable.c */
struct global_entry {
    struct global_variable *var;
    ID id;
};

#define GetProcPtr(obj, ptr) \
  Data_Get_Struct(obj, rb_proc_t, ptr)

typedef struct {
    rb_block_t block;

    VALUE envval;		/* for GC mark */
    VALUE blockprocval;
    int safe_level;
    int is_lambda;

    NODE *special_cref_stack;
} rb_proc_t;

#define GetEnvPtr(obj, ptr) \
  Data_Get_Struct(obj, rb_env_t, ptr)

typedef struct {
    VALUE *env;
    int env_size;
    int local_size;
    VALUE prev_envval;		/* for GC mark */
    rb_block_t block;
} rb_env_t;

#define GetBindingPtr(obj, ptr) \
  Data_Get_Struct(obj, rb_binding_t, ptr)

typedef struct {
    VALUE env;
    NODE *cref_stack;
} rb_binding_t;


/* used by compile time and send insn */
#define VM_CALL_ARGS_SPLAT_BIT     (0x01 << 1)
#define VM_CALL_ARGS_BLOCKARG_BIT  (0x01 << 2)
#define VM_CALL_FCALL_BIT          (0x01 << 3)
#define VM_CALL_VCALL_BIT          (0x01 << 4)
#define VM_CALL_TAILCALL_BIT       (0x01 << 5)
#define VM_CALL_TAILRECURSION_BIT  (0x01 << 6)
#define VM_CALL_SUPER_BIT          (0x01 << 7)
#define VM_CALL_SEND_BIT           (0x01 << 8)

/* inline (method|const) cache */
#define NEW_INLINE_CACHE_ENTRY() NEW_WHILE(Qundef, 0, 0)
#define ic_klass  u1.value
#define ic_method u2.node
#define ic_value  u2.value
#define ic_vmstat u3.cnt
typedef NODE *IC;

void rb_vm_change_state(void);

typedef VALUE CDHASH;



#define GC_GUARDED_PTR(p)     ((VALUE)((VALUE)(p) | 0x01))
#define GC_GUARDED_PTR_REF(p) ((void *)(((VALUE)p) & ~0x03))
#define GC_GUARDED_PTR_P(p)   (((VALUE)p) & 0x01)

#define RUBY_VM_METHOD_NODE NODE_METHOD

#define RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp) (cfp+1)
#define RUBY_VM_NEXT_CONTROL_FRAME(cfp) (cfp-1)
#define RUBY_VM_END_CONTROL_FRAME(th) \
  ((rb_control_frame_t *)((th)->stack + (th)->stack_size))
#define RUBY_VM_VALID_CONTROL_FRAME_P(cfp, ecfp) \
  ((void *)(ecfp) > (void *)(cfp))
#define RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(th, cfp) \
  (!RUBY_VM_VALID_CONTROL_FRAME_P((cfp), RUBY_VM_END_CONTROL_FRAME(th)))

#define RUBY_VM_IFUNC_P(ptr)        (BUILTIN_TYPE(ptr) == T_NODE)
#define RUBY_VM_NORMAL_ISEQ_P(ptr) \
  (ptr && !RUBY_VM_IFUNC_P(ptr))

#define RUBY_VM_CLASS_SPECIAL_P(ptr) (((VALUE)(ptr)) & 0x02)

#define RUBY_VM_GET_BLOCK_PTR_IN_CFP(cfp) ((rb_block_t *)(&(cfp)->self))
#define RUBY_VM_GET_CFP_FROM_BLOCK_PTR(b) \
  ((rb_control_frame_t *)((VALUE *)(b) - 5))


/* defined? */
#define DEFINED_IVAR   INT2FIX(1)
#define DEFINED_IVAR2  INT2FIX(2)
#define DEFINED_GVAR   INT2FIX(3)
#define DEFINED_CVAR   INT2FIX(4)
#define DEFINED_CONST  INT2FIX(5)
#define DEFINED_METHOD INT2FIX(6)
#define DEFINED_YIELD  INT2FIX(7)
#define DEFINED_REF    INT2FIX(8)
#define DEFINED_ZSUPER INT2FIX(9)
#define DEFINED_FUNC   INT2FIX(10)


/* VM related object allocate functions */
/* TODO: should be static functions */
VALUE rb_thread_alloc(VALUE klass);
VALUE rb_proc_alloc(void);

/* for debug */
extern void vm_stack_dump_raw(rb_thread_t *, rb_control_frame_t *);
#define SDR() vm_stack_dump_raw(GET_THREAD(), GET_THREAD()->cfp)
#define SDR2(cfp) vm_stack_dump_raw(GET_THREAD(), (cfp))
void yarv_bug(void);


/* functions about thread/vm execution */

VALUE rb_thread_eval(rb_thread_t *th, VALUE iseqval);
void rb_enable_interrupt(void);
void rb_disable_interrupt(void);
int rb_thread_method_id_and_klass(rb_thread_t *th, ID *idp, VALUE *klassp);

VALUE vm_eval_body(rb_thread_t *th);
VALUE vm_set_eval_stack(rb_thread_t *, VALUE iseq);
VALUE vm_invoke_proc(rb_thread_t *th, rb_proc_t *proc, VALUE self, int argc, VALUE *argv);
VALUE vm_make_proc(rb_thread_t *th, rb_control_frame_t *cfp, rb_block_t *block);
VALUE vm_make_env_object(rb_thread_t *th, rb_control_frame_t *cfp);
VALUE vm_backtrace(rb_thread_t *, int);

VALUE vm_yield(rb_thread_t *th, int argc, VALUE *argv);
VALUE vm_call0(rb_thread_t *th, VALUE klass, VALUE recv,
	       VALUE id, ID oid, int argc, const VALUE *argv,
	       NODE * body, int nosuper);

int vm_get_sourceline(rb_control_frame_t *);

VALUE yarvcore_eval_parsed(NODE *node, VALUE file);
VALUE yarvcore_eval(VALUE self, VALUE str, VALUE file, VALUE line);

/* for thread */

#if RUBY_VM_THREAD_MODEL == 2
extern rb_thread_t *ruby_current_thread;
extern rb_vm_t *ruby_current_vm;

#define GET_VM() ruby_current_vm
#define GET_THREAD() ruby_current_thread
#define rb_thread_set_current_raw(th) (ruby_current_thread = th)
#define rb_thread_set_current(th) do { \
    rb_thread_set_current_raw(th); \
    th->vm->running_thread = th; \
} while (0)

#else
#error "unsupported thread model"
#endif

void rb_thread_execute_interrupts(rb_thread_t *);

#define RUBY_VM_CHECK_INTS_TH(th) do { \
  if(th->interrupt_flag){ \
    /* TODO: trap something event */ \
    rb_thread_execute_interrupts(th); \
  } \
} while (0)

#define RUBY_VM_CHECK_INTS() \
  RUBY_VM_CHECK_INTS_TH(GET_THREAD())

#endif /* _YARVCORE_H_INCLUDED_ */