tools/perf/util/annotate-data.h

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

#include <errno.h>
#include <linux/compiler.h>
#include <linux/rbtree.h>
#include <linux/types.h>
#include "dwarf-regs.h"
#include "annotate.h"

#ifdef HAVE_LIBDW_SUPPORT
#include "debuginfo.h"
#endif

struct annotated_op_loc;
struct debuginfo;
struct evsel;
struct hist_browser_timer;
struct hist_entry;
struct map_symbol;
struct thread;

#define pr_debug_dtp(fmt, ...)					\
do {								\
	if (debug_type_profile)					\
		pr_info(fmt, ##__VA_ARGS__);			\
	else							\
		pr_debug3(fmt, ##__VA_ARGS__);			\
} while (0)

enum type_state_kind {
	TSR_KIND_INVALID = 0,
	TSR_KIND_TYPE,
	TSR_KIND_PERCPU_BASE,
	TSR_KIND_CONST,
	TSR_KIND_PERCPU_POINTER,
	TSR_KIND_POINTER,
	TSR_KIND_CANARY,
};

/**
 * struct annotated_member - Type of member field
 * @node: List entry in the parent list
 * @children: List head for child nodes
 * @type_name: Name of the member type
 * @var_name: Name of the member variable
 * @offset: Offset from the outer data type
 * @size: Size of the member field
 *
 * This represents a member type in a data type.
 */
struct annotated_member {
	struct list_head node;
	struct list_head children;
	char *type_name;
	char *var_name;
	int offset;
	int size;
};

/**
 * struct type_hist_entry - Histogram entry per offset
 * @nr_samples: Number of samples
 * @period: Count of event
 */
struct type_hist_entry {
	int nr_samples;
	u64 period;
};

/**
 * struct type_hist - Type histogram for each event
 * @nr_samples: Total number of samples in this data type
 * @period: Total count of the event in this data type
 * @offset: Array of histogram entry
 */
struct type_hist {
	u64			nr_samples;
	u64			period;
	struct type_hist_entry	addr[];
};

/**
 * struct annotated_data_type - Data type to profile
 * @node: RB-tree node for dso->type_tree
 * @self: Actual type information
 * @nr_histogram: Number of histogram entries
 * @histograms: An array of pointers to histograms
 *
 * This represents a data type accessed by samples in the profile data.
 */
struct annotated_data_type {
	struct rb_node node;
	struct annotated_member self;
	int nr_histograms;
	struct type_hist **histograms;
};

extern struct annotated_data_type unknown_type;
extern struct annotated_data_type stackop_type;
extern struct annotated_data_type canary_type;

/**
 * struct data_loc_info - Data location information
 * @arch: CPU architecture info
 * @thread: Thread info
 * @ms: Map and Symbol info
 * @ip: Instruction address
 * @var_addr: Data address (for global variables)
 * @cpumode: CPU execution mode
 * @op: Instruction operand location (regs and offset)
 * @di: Debug info
 * @fbreg: Frame base register
 * @fb_cfa: Whether the frame needs to check CFA
 * @type_offset: Final offset in the type
 */
struct data_loc_info {
	/* These are input field, should be filled by caller */
	const struct arch *arch;
	struct thread *thread;
	struct map_symbol *ms;
	u64 ip;
	u64 var_addr;
	u8 cpumode;
	struct annotated_op_loc *op;
	struct debuginfo *di;

	/* These are used internally */
	int fbreg;
	bool fb_cfa;

	/* This is for the result */
	int type_offset;
};

/**
 * struct annotated_data_stat - Debug statistics
 * @total: Total number of entry
 * @no_sym: No symbol or map found
 * @no_insn: Failed to get disasm line
 * @no_insn_ops: The instruction has no operands
 * @no_mem_ops: The instruction has no memory operands
 * @no_reg: Failed to extract a register from the operand
 * @no_dbginfo: The binary has no debug information
 * @no_cuinfo: Failed to find a compile_unit
 * @no_var: Failed to find a matching variable
 * @no_typeinfo: Failed to get a type info for the variable
 * @invalid_size: Failed to get a size info of the type
 * @bad_offset: The access offset is out of the type
 */
struct annotated_data_stat {
	int total;
	int no_sym;
	int no_insn;
	int no_insn_ops;
	int no_mem_ops;
	int no_reg;
	int no_dbginfo;
	int no_cuinfo;
	int no_var;
	int no_typeinfo;
	int invalid_size;
	int bad_offset;
	int insn_track;
};
extern struct annotated_data_stat ann_data_stat;

#ifdef HAVE_LIBDW_SUPPORT
/*
 * Type information in a register, valid when @ok is true.
 * The @caller_saved registers are invalidated after a function call.
 */
struct type_state_reg {
	Dwarf_Die type;
	u32 imm_value;
	/*
	 * The offset within the struct that the register points to.
	 * A value of 0 means the register points to the beginning.
	 * type_offset = op->offset + reg->offset
	 */
	s32 offset;
	bool ok;
	bool caller_saved;
	/* DWARF location range tracking for register lifetime */
	bool lifetime_active;
	u64 lifetime_end;
	u8 kind;
	u8 copied_from;
};

/* Type information in a stack location, dynamically allocated */
struct type_state_stack {
	struct list_head list;
	Dwarf_Die type;
	int offset;
	/* pointer offset, saves tsr->offset on the stack state */
	int ptr_offset;
	int size;
	bool compound;
	u8 kind;
};

/*
 * Maximum number of registers tracked in type_state.
 *
 * This limit must cover all supported architectures, since perf
 * may analyze perf.data files generated on systems with a different
 * register set. Use 32 as a safe upper bound instead of relying on
 * build-arch specific values.
 */
#define TYPE_STATE_MAX_REGS  32

/*
 * State table to maintain type info in each register and stack location.
 * It'll be updated when new variable is allocated or type info is moved
 * to a new location (register or stack).  As it'd be used with the
 * shortest path of basic blocks, it only maintains a single table.
 */
struct type_state {
	/* state of general purpose registers */
	struct type_state_reg regs[TYPE_STATE_MAX_REGS];
	/* state of stack location */
	struct list_head stack_vars;
	/* return value register */
	int ret_reg;
	/* stack pointer register */
	int stack_reg;
};

/* Returns data type at the location (ip, reg, offset) */
struct annotated_data_type *find_data_type(struct data_loc_info *dloc);

/* Update type access histogram at the given offset */
int annotated_data_type__update_samples(struct annotated_data_type *adt,
					struct evsel *evsel, int offset,
					int nr_samples, u64 period);

/* Release all data type information in the tree */
void annotated_data_type__tree_delete(struct rb_root *root);

/* Release all global variable information in the tree */
void global_var_type__tree_delete(struct rb_root *root);

/* Print data type annotation (including members) on stdout */
int hist_entry__annotate_data_tty(struct hist_entry *he, struct evsel *evsel);

/* Get name of member field at the given offset in the data type */
int annotated_data_type__get_member_name(struct annotated_data_type *adt,
					 char *buf, size_t sz, int member_offset);

bool has_reg_type(struct type_state *state, int reg);
struct type_state_stack *findnew_stack_state(struct type_state *state,
						int offset, u8 kind,
						Dwarf_Die *type_die,
						int ptr_offset);
void set_stack_state(struct type_state_stack *stack, int offset, u8 kind,
				Dwarf_Die *type_die, int ptr_offset);
struct type_state_stack *find_stack_state(struct type_state *state,
						int offset);
bool get_global_var_type(Dwarf_Die *cu_die, struct data_loc_info *dloc,
				u64 ip, u64 var_addr, int *var_offset,
				Dwarf_Die *type_die);
bool get_global_var_info(struct data_loc_info *dloc, u64 addr,
				const char **var_name, int *var_offset);
void pr_debug_type_name(Dwarf_Die *die, enum type_state_kind kind);

#else /* HAVE_LIBDW_SUPPORT */

static inline struct annotated_data_type *
find_data_type(struct data_loc_info *dloc __maybe_unused)
{
	return NULL;
}

static inline int
annotated_data_type__update_samples(struct annotated_data_type *adt __maybe_unused,
				    struct evsel *evsel __maybe_unused,
				    int offset __maybe_unused,
				    int nr_samples __maybe_unused,
				    u64 period __maybe_unused)
{
	return -1;
}

static inline void annotated_data_type__tree_delete(struct rb_root *root __maybe_unused)
{
}

static inline void global_var_type__tree_delete(struct rb_root *root __maybe_unused)
{
}

static inline int hist_entry__annotate_data_tty(struct hist_entry *he __maybe_unused,
						struct evsel *evsel __maybe_unused)
{
	return -1;
}

static inline int annotated_data_type__get_member_name(struct annotated_data_type *adt __maybe_unused,
						       char *buf __maybe_unused,
						       size_t sz __maybe_unused,
						       int member_offset __maybe_unused)
{
	return -1;
}

#endif /* HAVE_LIBDW_SUPPORT */

#ifdef HAVE_SLANG_SUPPORT
int hist_entry__annotate_data_tui(struct hist_entry *he, struct evsel *evsel,
				  struct hist_browser_timer *hbt);
#else
static inline int hist_entry__annotate_data_tui(struct hist_entry *he __maybe_unused,
						struct evsel *evsel __maybe_unused,
						struct hist_browser_timer *hbt __maybe_unused)
{
	return -1;
}
#endif /* HAVE_SLANG_SUPPORT */

#endif /* _PERF_ANNOTATE_DATA_H */