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#ifndef PROC_H
#define PROC_H
#include "ir.h"
#include "xar.h"
typedef struct NameBinding {
struct NameBinding *prev;
LexSpan src_pos;
Str name;
Node *node;
unsigned nestlvl;
} NameBinding;
typedef struct ScopeFrame {
struct ScopeFrame *prev;
NameBinding *latest;
} ScopeFrame;
typedef struct {
NameBinding *bind;
Node *from, *to;
LexSpan from_pos, to_pos;
} ScopeChange;
typedef struct ScopeChangeList {
XAR(ScopeChange);
struct ScopeChangeList *prev;
Arena *arena;
} ScopeChangeList;
typedef struct {
Arena *arena;
ScopeFrame *tail, *free_scope;
NameBinding *free_bind;
ScopeChangeList *changes;
unsigned nestlvl;
} Scope;
ScopeFrame *scope_push(Scope *scope);
ScopeFrame *scope_pop(Scope *scope, Graph *g);
NameBinding *scope_find(Scope *scope, Str name);
NameBinding *scope_bind(Scope *scope, Str name, Node *value, LexSpan pos, Graph *g);
NameBinding *scope_update(Scope *scope, NameBinding *b, Node *to, Graph *g);
void scope_changelist_update(ScopeChangeList *l, NameBinding *b, Node *from, Node *to, Graph *g);
void scope_changelist_push(Scope *scope, ScopeChangeList *l, Arena *a);
void scope_changelist_pop(Scope *scope, Graph *g);
void scope_changelist_merge(Scope *scope, ScopeChangeList *y, ScopeChangeList *n, Node *region, Graph *graph, Arena *scratch);
void scope_changelist_discard(ScopeChangeList *l, Graph *g);
typedef struct {
Str name;
Type ret_type;
Arena perm, scratch;
NodePool pool;
Graph graph;
Scope scope;
} Proc;
void proc_init(Proc *proc, Str name);
void proc_free(Proc *proc);
#endif
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