Reformats output of Pahole utility. Prints fields of structs and unions based on compiled debugging info, including type information where there is room. Empty space (padding) is denoted using X's.
Source code:
struct foo {
char a;
bool b;
int c;
double d;
};
union bar {
char a;
bool b;
int c;
double d;
};
Formatted output:
struct foo:
0 4 8 12 16
| | | | |
-----------------------------------------------------------------
| a | b |#######| c : int | d : double |
-----------------------------------------------------------------
union bar:
0 4 8
| | |
-----
| a |
-----
| b |
-----------------
| c : int |
---------------------------------
| d : double |
---------------------------------
Source code:
#define NUMREGS 15
typedef int64_t y86_reg_t;
typedef int32_t y86_stat_t;
typedef struct y86 {
y86_reg_t reg[NUMREGS]; // 64-bit general-purpose registers
bool zf; // zero flag
bool sf; // negative flag
bool of; // overflow flag
y86_reg_t pc; // program counter
y86_stat_t stat; // program status
} y86_t;
Formatted output:
struct y86:
0 4 8 12 16
| | | | |
-----------------------------------------------------------------
| reg[15] : y86_reg_t |
-----------------------------------------------------------------
| |
-----------------------------------------------------------------
| |
-----------------------------------------------------------------
| |
-----------------------------------------------------------------
| |
-----------------------------------------------------------------
| |
-----------------------------------------------------------------
| |
-----------------------------------------------------------------
| |zf |sf |of |###################|
-----------------------------------------------------------------
| pc : y86_reg_t | stat |
-------------------------------------------------
Source code:
typedef uint64_t address_t;
typedef struct y86_inst {
uint8_t opcode; // icode:ifun/fn
// enumerations
y86_inst_class_t icode; // icode
y86_cmov_t cmov; // ifun/fn (cmovXX only)
y86_op_t op; // ifun/fn (OPq only)
y86_jump_t jump; // ifun/fn (jXX only)
y86_iotrap_t id; // trap id (iotrap only)
// 32-bit unsigned
y86_regnum_t ra; // rA
y86_regnum_t rb; // rB
address_t dest; // Dest (jXX and call only)
int64_t v; // V (irmovq only)
int64_t d; // D (rmmovq and mrmovq only)
uint8_t size; // hard-coded for each instruction
} y86_inst_t;
Formatted output:
struct y86_inst:
0 4 8 12 16
| | | | |
-----------------------------------------------------------------
|opc|###########| icode | cmov | op : y86_op_t |
-----------------------------------------------------------------
| jump | id | ra | rb |
-----------------------------------------------------------------
| dest : address_t | v : int64_t |
-----------------------------------------------------------------
| d : int64_t |siz|
-------------------------------------
This utility depends on the availability of the pahole
utility, so follow the
directions in that repository for downloading, compiling, and installing
Pahole.
After Pahole is available, simply clone this repository and make sure the
pahole-fmt.rb script is in your executable path.
Just run pahole on your binary executable and redirect the output through
this utility. For example, if both of them are in your path, you should be able
to run a command similar to this:
pahole <your-executable> | pahole-fmt.rb
Your executable must be compiled with debugging information (-g in most
compilers), and your structs and unions must be named. C++ classes will be
detected as structs (e.g., data layout only).
To get involved, submit an issue or email the author directly.
To contribute, submit a pull request or email the author directly.
This software is released under the MIT license.
Copyright (C) 2019 Michael O. Lam
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