cpython/Python/wordcode_helpers.h at 3.6 · python/cpython · GitHub

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/* This file contains code shared by the compiler and the peephole

optimizer.

#ifdef WORDS_BIGENDIAN

# define PACKOPARG(opcode, oparg) ((_Py_CODEUNIT)(((opcode) << 8) | (oparg)))

#else

# define PACKOPARG(opcode, oparg) ((_Py_CODEUNIT)(((oparg) << 8) | (opcode)))

#endif

/* Minimum number of code units necessary to encode instruction with

EXTENDED_ARGs */

static int

instrsize(unsigned int oparg)

{

return oparg <= 0xff ? 1 :

oparg <= 0xffff ? 2 :

oparg <= 0xffffff ? 3 :

}

/* Spits out op/oparg pair using ilen bytes. codestr should be pointed at the

desired location of the first EXTENDED_ARG */

static void

write_op_arg(_Py_CODEUNIT *codestr, unsigned char opcode,

unsigned int oparg, int ilen)

{

switch (ilen) {

case 4:

*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 24) & 0xff);

/* fall through */

case 3:

*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 16) & 0xff);

/* fall through */

case 2:

*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 8) & 0xff);

/* fall through */

case 1:

*codestr++ = PACKOPARG(opcode, oparg & 0xff);

break;

default:

assert(0);

}

cpython/Python/wordcode_helpers.h at 3.6 · python/cpython · GitHub

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