jitdump.h

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/*
 * jitdump.h: jitted code info encapsulation file format
 *
 * Adapted from OProfile GPLv2 support jidump.h:
 * Copyright 2007 OProfile authors
 * Jens Wilke
 * Daniel Hansel
 * Copyright IBM Corporation 2007
 */
#ifndef JITDUMP_H
#define JITDUMP_H

#include <sys/time.h>
#include <time.h>
#include <stdint.h>

/* JiTD */
#define JITHEADER_MAGIC     0x4A695444
#define JITHEADER_MAGIC_SW  0x4454694A

#define PADDING_8ALIGNED(x) ((((x) + 7) & 7) ^ 7)
#define ALIGN_8(x) (((x) + 7) & (~7))

#define JITHEADER_VERSION 1

enum jitdump_flags_bits {
    JITDUMP_FLAGS_ARCH_TIMESTAMP_BIT,
    JITDUMP_FLAGS_MAX_BIT,
};

#define JITDUMP_FLAGS_ARCH_TIMESTAMP    (1ULL << JITDUMP_FLAGS_ARCH_TIMESTAMP_BIT)

#define JITDUMP_FLAGS_RESERVED (JITDUMP_FLAGS_MAX_BIT < 64 ? \
                (~((1ULL << JITDUMP_FLAGS_MAX_BIT) - 1)) : 0)

struct jitheader {
    uint32_t magic;     /* characters "jItD" */
    uint32_t version;   /* header version */
    uint32_t total_size;    /* total size of header */
    uint32_t elf_mach;  /* elf mach target */
    uint32_t pad1;      /* reserved */
    uint32_t pid;       /* JIT process id */
    uint64_t timestamp; /* timestamp */
    uint64_t flags;     /* flags */
};

enum jit_record_type {
    JIT_CODE_LOAD       = 0,
        JIT_CODE_MOVE           = 1,
    JIT_CODE_DEBUG_INFO = 2,
    JIT_CODE_CLOSE      = 3,
    JIT_CODE_UNWINDING_INFO = 4,

    JIT_CODE_MAX,
};

/* record prefix (mandatory in each record) */
struct jr_prefix {
    uint32_t id;
    uint32_t total_size;
    uint64_t timestamp;
};

struct jr_code_load {
    struct jr_prefix p;

    uint32_t pid;
    uint32_t tid;
    uint64_t vma;
    uint64_t code_addr;
    uint64_t code_size;
    uint64_t code_index;
};

struct jr_code_close {
    struct jr_prefix p;
};

struct jr_code_move {
    struct jr_prefix p;

    uint32_t pid;
    uint32_t tid;
    uint64_t vma;
    uint64_t old_code_addr;
    uint64_t new_code_addr;
    uint64_t code_size;
    uint64_t code_index;
};

struct debug_entry {
    uint64_t addr;
    int lineno;     /* source line number starting at 1 */
    int discrim;        /* column discriminator, 0 is default */
    const char name[0]; /* null terminated filename, \xff\0 if same as previous entry */
};

struct jr_code_debug_info {
    struct jr_prefix p;

    uint64_t code_addr;
    uint64_t nr_entry;
    struct debug_entry entries[0];
};

struct jr_code_unwinding_info {
    struct jr_prefix p;

    uint64_t unwinding_size;
    uint64_t eh_frame_hdr_size;
    uint64_t mapped_size;
    const char unwinding_data[0];
};

union jr_entry {
        struct jr_code_debug_info info;
        struct jr_code_close close;
        struct jr_code_load load;
        struct jr_code_move move;
        struct jr_prefix prefix;
        struct jr_code_unwinding_info unwinding;
};

static inline struct debug_entry *
debug_entry_next(struct debug_entry *ent)
{
    void *a = ent + 1;
    size_t l = strlen(ent->name) + 1;
    return a + l;
}

static inline char *
debug_entry_file(struct debug_entry *ent)
{
    void *a = ent + 1;
    return a;
}

#endif /* !JITDUMP_H */