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38 lines
1 KiB
C
38 lines
1 KiB
C
/* This file contains code shared by the compiler and the peephole
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optimizer.
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*/
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/* Minimum number of bytes necessary to encode instruction with EXTENDED_ARGs */
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static int
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instrsize(unsigned int oparg)
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{
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return oparg <= 0xff ? 2 :
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oparg <= 0xffff ? 4 :
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oparg <= 0xffffff ? 6 :
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8;
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}
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/* Spits out op/oparg pair using ilen bytes. codestr should be pointed at the
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desired location of the first EXTENDED_ARG */
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static void
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write_op_arg(unsigned char *codestr, unsigned char opcode,
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unsigned int oparg, int ilen)
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{
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switch (ilen) {
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case 8:
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*codestr++ = EXTENDED_ARG;
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*codestr++ = (oparg >> 24) & 0xff;
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case 6:
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*codestr++ = EXTENDED_ARG;
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*codestr++ = (oparg >> 16) & 0xff;
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case 4:
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*codestr++ = EXTENDED_ARG;
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*codestr++ = (oparg >> 8) & 0xff;
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case 2:
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*codestr++ = opcode;
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*codestr++ = oparg & 0xff;
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break;
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default:
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assert(0);
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}
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}
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