#ifndef PROC_H
#define PROC_H

#include "ir.h"

typedef struct NameBinding {
	struct NameBinding *prev;
	LexSpan src_pos;
	Str name;
	Node *node;
} NameBinding;

typedef struct ScopeFrame {
	struct ScopeFrame *prev;
	NameBinding *latest;
} ScopeFrame;

typedef struct {
	Arena *arena;
	ScopeFrame *tail, *free_scope;
	NameBinding *free_bind;
} Scope;

typedef struct {
	Str name;
	Node *node;
} ScopeName;

typedef DYNARR(ScopeName) ScopeNameList;

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);

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(NameBinding *b, Node *to, Graph *g);
void scope_collect(Scope *scope, Graph *g, ScopeNameList *nl, Arena *arena);
void scope_uncollect(Scope *scope, Graph *g, ScopeNameList *nl);

#endif