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PAHOLE.md

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pahole

This is an enhanced and redone version of the pahole python command that once came with gdb. It has support for virtual inheritance and a possibly more useful layout display. While it now supports bitfields, it still has trouble with unions ( and will mostly arbitrarily chose one of the possible values ). Type names are shortened via the standard mechanism where possible.

Commands

pahole

This expects a type and can have one of two flavours, see below. Setting vdb-pahole-default-condensed will change the default, but you can always override with /c or /e

The following examples are for the following code:

struct f0 {
	char c;
	uint32_t x;
	virtual ~f0(){}
};

struct f1 : f0 {
	char c;
	uint32_t x;
	virtual ~f1(){}
};

struct f2 : f1,f0 {
	char c;
	uint32_t x;
	virtual ~f2(){}
	char o;
};
 
struct innerst {
	int i;
	double po;
};

struct small {
	char c = 'C';
	uint16_t x = 0x8787;
	char h = 'H';
};

struct big {
	uint64_t n = 0x7272727272727272;
};

struct morev : virtual small, virtual big, virtual innerst {
	uint64_t y = 0x4b4b4b4b4b4b4b4b;
	uint16_t p = 0x1515;
	char u = 'U';
};

pahole/c

This shows the types layout in a condensed format, one line per member, showing which bytes belong to it in the front

pahole/e

This shows the layout in an extended format, one line per byte.

Configuration

You have the following settings to influence the output

  • vdb-pahole-default-condensed sets if /c or /e are default when not given
  • vdb-pahole-colors-members A list of colors for the different members
  • vdb-pahole-color-empty The color to use for empty space
  • vdb-pahole-color-type The color to use for the type name