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author | Nick Coghlan <ncoghlan@gmail.com> | 2017-02-09 16:08:17 +0100 |
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committer | Nick Coghlan <ncoghlan@gmail.com> | 2017-02-09 16:08:17 +0100 |
commit | c6180bb73c8c7c7f9d8ea9816487b710597b6fc1 (patch) | |
tree | fb4a5c18886537b4b7df46ed3b2aa579747ff507 /Python/wordcode_helpers.h | |
parent | 5e0114a832a903518c4af6983161c0c2a8942a24 (diff) | |
parent | 819a21a3a4aac38f32e1ba4f68bcef45591fa3f0 (diff) | |
download | cpython-c6180bb73c8c7c7f9d8ea9816487b710597b6fc1.tar.gz |
Merge issue #26355 fix from Python 3.5
Diffstat (limited to 'Python/wordcode_helpers.h')
-rw-r--r-- | Python/wordcode_helpers.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/Python/wordcode_helpers.h b/Python/wordcode_helpers.h new file mode 100644 index 0000000000..b0e3a91776 --- /dev/null +++ b/Python/wordcode_helpers.h @@ -0,0 +1,41 @@ +/* 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 : + 4; +} + +/* 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); + case 3: + *codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 16) & 0xff); + case 2: + *codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 8) & 0xff); + case 1: + *codestr++ = PACKOPARG(opcode, oparg & 0xff); + break; + default: + assert(0); + } +} |