/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_CALLCHAIN_H
#define __PERF_CALLCHAIN_H

#include <linux/list.h>
#include <linux/rbtree.h>
#include "map_symbol.h"
#include "branch.h"

struct addr_location;
struct evsel;
struct ip_callchain;
struct map;
struct perf_sample;
struct thread;
struct hists;

#define HELP_PAD "\t\t\t\t"

#define CALLCHAIN_HELP "setup and enables call-graph (stack chain/backtrace):\n\n"

# define RECORD_MODE_HELP  HELP_PAD "record_mode:\tcall graph recording mode (fp|dwarf|lbr)\n"

#define RECORD_SIZE_HELP                                                \
        HELP_PAD "record_size:\tif record_mode is 'dwarf', max size of stack recording (<bytes>)\n" \
        HELP_PAD "\t\tdefault: 8192 (bytes)\n"

#define CALLCHAIN_RECORD_HELP  CALLCHAIN_HELP RECORD_MODE_HELP RECORD_SIZE_HELP

#define CALLCHAIN_REPORT_HELP                                           \
        HELP_PAD "print_type:\tcall graph printing style (graph|flat|fractal|folded|none)\n" \
        HELP_PAD "threshold:\tminimum call graph inclusion threshold (<percent>)\n" \
        HELP_PAD "print_limit:\tmaximum number of call graph entry (<number>)\n" \
        HELP_PAD "order:\t\tcall graph order (caller|callee)\n" \
        HELP_PAD "sort_key:\tcall graph sort key (function|address)\n"  \
        HELP_PAD "branch:\t\tinclude last branch info to call graph (branch)\n" \
        HELP_PAD "value:\t\tcall graph value (percent|period|count)\n"

enum perf_call_graph_mode {
        CALLCHAIN_NONE,
        CALLCHAIN_FP,
        CALLCHAIN_DWARF,
        CALLCHAIN_LBR,
        CALLCHAIN_MAX
};

enum chain_mode {
        CHAIN_NONE,
        CHAIN_FLAT,
        CHAIN_GRAPH_ABS,
        CHAIN_GRAPH_REL,
        CHAIN_FOLDED,
};

enum chain_order {
        ORDER_CALLER,
        ORDER_CALLEE
};

struct callchain_node {
        struct callchain_node   *parent;
        struct list_head        val;
        struct list_head        parent_val;
        struct rb_node          rb_node_in; /* to insert nodes in an rbtree */
        struct rb_node          rb_node;    /* to sort nodes in an output tree */
        struct rb_root          rb_root_in; /* input tree of children */
        struct rb_root          rb_root;    /* sorted output tree of children */
        unsigned int            val_nr;
        unsigned int            count;
        unsigned int            children_count;
        u64                     hit;
        u64                     children_hit;
};

struct callchain_root {
        u64                     max_depth;
        struct callchain_node   node;
};

struct callchain_param;

typedef void (*sort_chain_func_t)(struct rb_root *, struct callchain_root *,
                                 u64, struct callchain_param *);

enum chain_key {
        CCKEY_FUNCTION,
        CCKEY_ADDRESS,
        CCKEY_SRCLINE
};

enum chain_value {
        CCVAL_PERCENT,
        CCVAL_PERIOD,
        CCVAL_COUNT,
};

extern bool dwarf_callchain_users;

struct callchain_param {
        bool                    enabled;
        enum perf_call_graph_mode record_mode;
        u32                     dump_size;
        enum chain_mode         mode;
        u16                     max_stack;
        u32                     print_limit;
        double                  min_percent;
        sort_chain_func_t       sort;
        enum chain_order        order;
        bool                    order_set;
        enum chain_key          key;
        bool                    branch_callstack;
        enum chain_value        value;
};

extern struct callchain_param callchain_param;
extern struct callchain_param callchain_param_default;

struct callchain_list {
        u64                     ip;
        struct map_symbol       ms;
        struct /* for TUI */ {
                bool            unfolded;
                bool            has_children;
        };
        u64                     branch_count;
        u64                     from_count;
        u64                     predicted_count;
        u64                     abort_count;
        u64                     cycles_count;
        u64                     iter_count;
        u64                     iter_cycles;
        struct branch_type_stat brtype_stat;
        const char              *srcline;
        struct list_head        list;
};

/*
 * A callchain cursor is a single linked list that
 * let one feed a callchain progressively.
 * It keeps persistent allocated entries to minimize
 * allocations.
 */
struct callchain_cursor_node {
        u64                             ip;
        struct map_symbol               ms;
        const char                      *srcline;
        /* Indicate valid cursor node for LBR stitch */
        bool                            valid;

        bool                            branch;
        struct branch_flags             branch_flags;
        u64                             branch_from;
        int                             nr_loop_iter;
        u64                             iter_cycles;
        struct callchain_cursor_node    *next;
};

struct stitch_list {
        struct list_head                node;
        struct callchain_cursor_node    cursor;
};

struct callchain_cursor {
        u64                             nr;
        struct callchain_cursor_node    *first;
        struct callchain_cursor_node    **last;
        u64                             pos;
        struct callchain_cursor_node    *curr;
};

extern __thread struct callchain_cursor callchain_cursor;

static inline void callchain_init(struct callchain_root *root)
{
        INIT_LIST_HEAD(&root->node.val);
        INIT_LIST_HEAD(&root->node.parent_val);

        root->node.parent = NULL;
        root->node.hit = 0;
        root->node.children_hit = 0;
        root->node.rb_root_in = RB_ROOT;
        root->max_depth = 0;
}

static inline u64 callchain_cumul_hits(struct callchain_node *node)
{
        return node->hit + node->children_hit;
}

static inline unsigned callchain_cumul_counts(struct callchain_node *node)
{
        return node->count + node->children_count;
}

int callchain_register_param(struct callchain_param *param);
int callchain_append(struct callchain_root *root,
                     struct callchain_cursor *cursor,
                     u64 period);

int callchain_merge(struct callchain_cursor *cursor,
                    struct callchain_root *dst, struct callchain_root *src);

void callchain_cursor_reset(struct callchain_cursor *cursor);

int callchain_cursor_append(struct callchain_cursor *cursor, u64 ip,
                            struct map_symbol *ms,
                            bool branch, struct branch_flags *flags,
                            int nr_loop_iter, u64 iter_cycles, u64 branch_from,
                            const char *srcline);

/* Close a cursor writing session. Initialize for the reader */
static inline void callchain_cursor_commit(struct callchain_cursor *cursor)
{
        cursor->curr = cursor->first;
        cursor->pos = 0;
}

/* Cursor reading iteration helpers */
static inline struct callchain_cursor_node *
callchain_cursor_current(struct callchain_cursor *cursor)
{
        if (cursor->pos == cursor->nr)
                return NULL;

        return cursor->curr;
}

static inline void callchain_cursor_advance(struct callchain_cursor *cursor)
{
        cursor->curr = cursor->curr->next;
        cursor->pos++;
}

int callchain_cursor__copy(struct callchain_cursor *dst,
                           struct callchain_cursor *src);

struct option;
struct hist_entry;

int record_parse_callchain_opt(const struct option *opt, const char *arg, int unset);
int record_callchain_opt(const struct option *opt, const char *arg, int unset);

struct record_opts;

int record_opts__parse_callchain(struct record_opts *record,
                                 struct callchain_param *callchain,
                                 const char *arg, bool unset);

int sample__resolve_callchain(struct perf_sample *sample,
                              struct callchain_cursor *cursor, struct symbol **parent,
                              struct evsel *evsel, struct addr_location *al,
                              int max_stack);
int hist_entry__append_callchain(struct hist_entry *he, struct perf_sample *sample);
int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *node,
                        bool hide_unresolved);

extern const char record_callchain_help[];
int parse_callchain_record(const char *arg, struct callchain_param *param);
int parse_callchain_record_opt(const char *arg, struct callchain_param *param);
int parse_callchain_report_opt(const char *arg);
int parse_callchain_top_opt(const char *arg);
int perf_callchain_config(const char *var, const char *value);

static inline void callchain_cursor_snapshot(struct callchain_cursor *dest,
                                             struct callchain_cursor *src)
{
        *dest = *src;

        dest->first = src->curr;
        dest->nr -= src->pos;
}

#ifdef HAVE_SKIP_CALLCHAIN_IDX
int arch_skip_callchain_idx(struct thread *thread, struct ip_callchain *chain);
#else
static inline int arch_skip_callchain_idx(struct thread *thread __maybe_unused,
                        struct ip_callchain *chain __maybe_unused)
{
        return -1;
}
#endif

char *callchain_list__sym_name(struct callchain_list *cl,
                               char *bf, size_t bfsize, bool show_dso);
char *callchain_node__scnprintf_value(struct callchain_node *node,
                                      char *bf, size_t bfsize, u64 total);
int callchain_node__fprintf_value(struct callchain_node *node,
                                  FILE *fp, u64 total);

int callchain_list_counts__printf_value(struct callchain_list *clist,
                                        FILE *fp, char *bf, int bfsize);

void free_callchain(struct callchain_root *root);
void decay_callchain(struct callchain_root *root);
int callchain_node__make_parent_list(struct callchain_node *node);

int callchain_branch_counts(struct callchain_root *root,
                            u64 *branch_count, u64 *predicted_count,
                            u64 *abort_count, u64 *cycles_count);

void callchain_param_setup(u64 sample_type);

bool callchain_cnode_matched(struct callchain_node *base_cnode,
                             struct callchain_node *pair_cnode);

u64 callchain_total_hits(struct hists *hists);

s64 callchain_avg_cycles(struct callchain_node *cnode);

#endif  /* __PERF_CALLCHAIN_H */