[Python] 自动转化gcc扩展中的designated Initializers
Designated Initializers作为gcc的一种主要扩展，是代码平台移植的主要障碍之一。下面是一个针对性的例子，其它形式的designated Initializers通过修改脚本中的正则表达式就可处理。
#!/usr/bin/python# assume the offset is in order, or the result could be incorrectimport restru_list = ["sse_op_table1"]leading_space = " "# we have the form [0x..] = {},def print_without_offset(text): val = text.split('=', 1); if val: print leading_space + val[1].lstrip() else: assert 0def print_one_elem(text): res = re.search(r"{", text) if not res: val = re.search(r"(.*) = (.*),(.*)", text) if val: print leading_space + "{ " + val.group(2) + " }," + val.group(3) pass else: assert 0 else: print_without_offset(text)def translate_struct(size): idx = 0x0 while True: try: text = raw_input() except EOFError: break if (text.lstrip().rstrip() == "};"): # meet the end of struct definition if (idx != size): for i in range(idx, (size - 1)): print "%s{ NULL }," % (leading_space) print "%s{ NULL }" % (leading_space) print text # print "};" break result = re.search(r"^(\s*)\[0x([\da-f]+)\] =", text) if not result: print text # probably blank line or comments continue cur_idx = int(result.group(2), 16) assert(cur_idx >= idx) if (idx != cur_idx): leading_space = result.group(1) for i in range(idx, cur_idx): print "%s{ NULL }," % (leading_space) # print the current one print_one_elem(text) idx = cur_idx + 1while True: try: text = raw_input() except EOFError: break for elem in stru_list: elem = elem + r"\[(\d+)\]" result = re.search(elem, text) if result: #TODO: print text translate_struct(int(result.group(1))) break;其中stru_list指定了要转化的结构体名称。
如有以下结构体（在a.c文件中），要转化为非gcc extension的格式。
static void *sse_op_table1[256][4] = { /* 3DNow! extensions */ [0x0e] = { SSE_DUMMY }, /* femms */ [0x0f] = { SSE_DUMMY }, /* pf... */ /* pure SSE operations */ [0x10] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movups, movupd, movss, movsd */ [0x11] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movups, movupd, movss, movsd */ [0x12] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movlps, movlpd, movsldup, movddup */ [0x13] = { SSE_SPECIAL, SSE_SPECIAL }, /* movlps, movlpd */ [0x14] = { gen_helper_punpckldq_xmm, gen_helper_punpcklqdq_xmm }, [0x15] = { gen_helper_punpckhdq_xmm, gen_helper_punpckhqdq_xmm }, [0x16] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movhps, movhpd, movshdup */ [0x17] = { SSE_SPECIAL, SSE_SPECIAL }, /* movhps, movhpd */ [0x28] = { SSE_SPECIAL, SSE_SPECIAL }, /* movaps, movapd */ [0x29] = { SSE_SPECIAL, SSE_SPECIAL }, /* movaps, movapd */ [0x2a] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* cvtpi2ps, cvtpi2pd, cvtsi2ss, cvtsi2sd */ [0x2b] = { SSE_SPECIAL, SSE_SPECIAL }, /* movntps, movntpd */ [0x2c] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* cvttps2pi, cvttpd2pi, cvttsd2si, cvttss2si */ [0x2d] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* cvtps2pi, cvtpd2pi, cvtsd2si, cvtss2si */ [0x2e] = { gen_helper_ucomiss, gen_helper_ucomisd }, [0x2f] = { gen_helper_comiss, gen_helper_comisd }, [0x38] = { SSE_SPECIAL, SSE_SPECIAL, NULL, SSE_SPECIAL }, /* SSSE3/SSE4 */ [0x3a] = { SSE_SPECIAL, SSE_SPECIAL }, /* SSSE3/SSE4 */ [0x50] = { SSE_SPECIAL, SSE_SPECIAL }, /* movmskps, movmskpd */ [0x51] = SSE_FOP(sqrt), [0x52] = { gen_helper_rsqrtps, NULL, gen_helper_rsqrtss, NULL }, [0x53] = { gen_helper_rcpps, NULL, gen_helper_rcpss, NULL }, [0x54] = { gen_helper_pand_xmm, gen_helper_pand_xmm }, /* andps, andpd */ [0x55] = { gen_helper_pandn_xmm, gen_helper_pandn_xmm }, /* andnps, andnpd */ [0x56] = { gen_helper_por_xmm, gen_helper_por_xmm }, /* orps, orpd */ [0x57] = { gen_helper_pxor_xmm, gen_helper_pxor_xmm }, /* xorps, xorpd */ [0x58] = SSE_FOP(add), [0x59] = SSE_FOP(mul), [0x5a] = { gen_helper_cvtps2pd, gen_helper_cvtpd2ps, gen_helper_cvtss2sd, gen_helper_cvtsd2ss }, [0x5b] = { gen_helper_cvtdq2ps, gen_helper_cvtps2dq, gen_helper_cvttps2dq }, [0x5c] = SSE_FOP(sub), [0x5d] = SSE_FOP(min), [0x5e] = SSE_FOP(div), [0x5f] = SSE_FOP(max), /* MMX ops and their SSE extensions */ [0x60] = MMX_OP2(punpcklbw), [0x61] = MMX_OP2(punpcklwd), [0x62] = MMX_OP2(punpckldq), [0x63] = MMX_OP2(packsswb), [0x64] = MMX_OP2(pcmpgtb), [0x65] = MMX_OP2(pcmpgtw), [0x66] = MMX_OP2(pcmpgtl), [0x67] = MMX_OP2(packuswb), [0x68] = MMX_OP2(punpckhbw), [0x69] = MMX_OP2(punpckhwd), [0x6a] = MMX_OP2(punpckhdq), [0x6b] = MMX_OP2(packssdw), [0x6c] = { NULL, gen_helper_punpcklqdq_xmm }, [0x6d] = { NULL, gen_helper_punpckhqdq_xmm }, [0x6e] = { SSE_SPECIAL, SSE_SPECIAL }, /* movd mm, ea */ [0x6f] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movq, movdqa, , movqdu */ [0x70] = { gen_helper_pshufw_mmx, gen_helper_pshufd_xmm, gen_helper_pshufhw_xmm, gen_helper_pshuflw_xmm }, [0x71] = { SSE_SPECIAL, SSE_SPECIAL }, /* shiftw */ [0x72] = { SSE_SPECIAL, SSE_SPECIAL }, /* shiftd */ [0x73] = { SSE_SPECIAL, SSE_SPECIAL }, /* shiftq */ [0x74] = MMX_OP2(pcmpeqb), [0x75] = MMX_OP2(pcmpeqw), [0x76] = MMX_OP2(pcmpeql), [0x77] = { SSE_DUMMY }, /* emms */ [0x7c] = { NULL, gen_helper_haddpd, NULL, gen_helper_haddps }, [0x7d] = { NULL, gen_helper_hsubpd, NULL, gen_helper_hsubps }, [0x7e] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movd, movd, , movq */ [0x7f] = { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movq, movdqa, movdqu */ [0xc2] = SSE_FOP(cmpeq), [0xc4] = { SSE_SPECIAL, SSE_SPECIAL }, /* pinsrw */ [0xc5] = { SSE_SPECIAL, SSE_SPECIAL }, /* pextrw */ [0xc6] = { gen_helper_shufps, gen_helper_shufpd }, [0xd0] = { NULL, gen_helper_addsubpd, NULL, gen_helper_addsubps }, [0xd1] = MMX_OP2(psrlw), [0xd2] = MMX_OP2(psrld), [0xd3] = MMX_OP2(psrlq), [0xd4] = MMX_OP2(paddq), [0xd5] = MMX_OP2(pmullw), [0xd6] = { NULL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, [0xd7] = { SSE_SPECIAL, SSE_SPECIAL }, /* pmovmskb */ [0xd8] = MMX_OP2(psubusb), [0xd9] = MMX_OP2(psubusw), [0xda] = MMX_OP2(pminub), [0xdb] = MMX_OP2(pand), [0xdc] = MMX_OP2(paddusb), [0xdd] = MMX_OP2(paddusw), [0xde] = MMX_OP2(pmaxub), [0xdf] = MMX_OP2(pandn), [0xe0] = MMX_OP2(pavgb), [0xe1] = MMX_OP2(psraw), [0xe2] = MMX_OP2(psrad), [0xe3] = MMX_OP2(pavgw), [0xe4] = MMX_OP2(pmulhuw), [0xe5] = MMX_OP2(pmulhw), [0xe6] = { NULL, gen_helper_cvttpd2dq, gen_helper_cvtdq2pd, gen_helper_cvtpd2dq }, [0xe7] = { SSE_SPECIAL , SSE_SPECIAL }, /* movntq, movntq */ [0xe8] = MMX_OP2(psubsb), [0xe9] = MMX_OP2(psubsw), [0xea] = MMX_OP2(pminsw), [0xeb] = MMX_OP2(por), [0xec] = MMX_OP2(paddsb), [0xed] = MMX_OP2(paddsw), [0xee] = MMX_OP2(pmaxsw), [0xef] = MMX_OP2(pxor), [0xf0] = { NULL, NULL, NULL, SSE_SPECIAL }, /* lddqu */ [0xf1] = MMX_OP2(psllw), [0xf2] = MMX_OP2(pslld), [0xf3] = MMX_OP2(psllq), [0xf4] = MMX_OP2(pmuludq), [0xf5] = MMX_OP2(pmaddwd), [0xf6] = MMX_OP2(psadbw), [0xf7] = MMX_OP2(maskmov), [0xf8] = MMX_OP2(psubb), [0xf9] = MMX_OP2(psubw), [0xfa] = MMX_OP2(psubl), [0xfb] = MMX_OP2(psubq), [0xfc] = MMX_OP2(paddb), [0xfd] = MMX_OP2(paddw), [0xfe] = MMX_OP2(paddl),};
运行上面的脚本
./main.py < a.c > b.c
则产生b.c文件：
static void *sse_op_table1[256][4] = { /* 3DNow! extensions */ { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { SSE_DUMMY }, /* femms */ { SSE_DUMMY }, /* pf... */ /* pure SSE operations */ { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movups, movupd, movss, movsd */ { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movups, movupd, movss, movsd */ { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movlps, movlpd, movsldup, movddup */ { SSE_SPECIAL, SSE_SPECIAL }, /* movlps, movlpd */ { gen_helper_punpckldq_xmm, gen_helper_punpcklqdq_xmm }, { gen_helper_punpckhdq_xmm, gen_helper_punpckhqdq_xmm }, { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movhps, movhpd, movshdup */ { SSE_SPECIAL, SSE_SPECIAL }, /* movhps, movhpd */ { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { SSE_SPECIAL, SSE_SPECIAL }, /* movaps, movapd */ { SSE_SPECIAL, SSE_SPECIAL }, /* movaps, movapd */ { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* cvtpi2ps, cvtpi2pd, cvtsi2ss, cvtsi2sd */ { SSE_SPECIAL, SSE_SPECIAL }, /* movntps, movntpd */ { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* cvttps2pi, cvttpd2pi, cvttsd2si, cvttss2si */ { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* cvtps2pi, cvtpd2pi, cvtsd2si, cvtss2si */ { gen_helper_ucomiss, gen_helper_ucomisd }, { gen_helper_comiss, gen_helper_comisd }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { SSE_SPECIAL, SSE_SPECIAL, NULL, SSE_SPECIAL }, /* SSSE3/SSE4 */ { NULL }, { SSE_SPECIAL, SSE_SPECIAL }, /* SSSE3/SSE4 */ { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { SSE_SPECIAL, SSE_SPECIAL }, /* movmskps, movmskpd */ { SSE_FOP(sqrt) }, { gen_helper_rsqrtps, NULL, gen_helper_rsqrtss, NULL }, { gen_helper_rcpps, NULL, gen_helper_rcpss, NULL }, { gen_helper_pand_xmm, gen_helper_pand_xmm }, /* andps, andpd */ { gen_helper_pandn_xmm, gen_helper_pandn_xmm }, /* andnps, andnpd */ { gen_helper_por_xmm, gen_helper_por_xmm }, /* orps, orpd */ { gen_helper_pxor_xmm, gen_helper_pxor_xmm }, /* xorps, xorpd */ { SSE_FOP(add) }, { SSE_FOP(mul) }, { gen_helper_cvtps2pd, gen_helper_cvtpd2ps, gen_helper_cvtss2sd, gen_helper_cvtsd2ss }, { gen_helper_cvtdq2ps, gen_helper_cvtps2dq, gen_helper_cvttps2dq }, { SSE_FOP(sub) }, { SSE_FOP(min) }, { SSE_FOP(div) }, { SSE_FOP(max) }, /* MMX ops and their SSE extensions */ { MMX_OP2(punpcklbw) }, { MMX_OP2(punpcklwd) }, { MMX_OP2(punpckldq) }, { MMX_OP2(packsswb) }, { MMX_OP2(pcmpgtb) }, { MMX_OP2(pcmpgtw) }, { MMX_OP2(pcmpgtl) }, { MMX_OP2(packuswb) }, { MMX_OP2(punpckhbw) }, { MMX_OP2(punpckhwd) }, { MMX_OP2(punpckhdq) }, { MMX_OP2(packssdw) }, { NULL, gen_helper_punpcklqdq_xmm }, { NULL, gen_helper_punpckhqdq_xmm }, { SSE_SPECIAL, SSE_SPECIAL }, /* movd mm, ea */ { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movq, movdqa, , movqdu */ { gen_helper_pshufw_mmx, gen_helper_pshufd_xmm, gen_helper_pshufhw_xmm, gen_helper_pshuflw_xmm }, { SSE_SPECIAL, SSE_SPECIAL }, /* shiftw */ { SSE_SPECIAL, SSE_SPECIAL }, /* shiftd */ { SSE_SPECIAL, SSE_SPECIAL }, /* shiftq */ { MMX_OP2(pcmpeqb) }, { MMX_OP2(pcmpeqw) }, { MMX_OP2(pcmpeql) }, { SSE_DUMMY }, /* emms */ { NULL }, { NULL }, { NULL }, { NULL }, { NULL, gen_helper_haddpd, NULL, gen_helper_haddps }, { NULL, gen_helper_hsubpd, NULL, gen_helper_hsubps }, { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movd, movd, , movq */ { SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, /* movq, movdqa, movdqu */ { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { SSE_FOP(cmpeq) }, { NULL }, { SSE_SPECIAL, SSE_SPECIAL }, /* pinsrw */ { SSE_SPECIAL, SSE_SPECIAL }, /* pextrw */ { gen_helper_shufps, gen_helper_shufpd }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL }, { NULL, gen_helper_addsubpd, NULL, gen_helper_addsubps }, { MMX_OP2(psrlw) }, { MMX_OP2(psrld) }, { MMX_OP2(psrlq) }, { MMX_OP2(paddq) }, { MMX_OP2(pmullw) }, { NULL, SSE_SPECIAL, SSE_SPECIAL, SSE_SPECIAL }, { SSE_SPECIAL, SSE_SPECIAL }, /* pmovmskb */ { MMX_OP2(psubusb) }, { MMX_OP2(psubusw) }, { MMX_OP2(pminub) }, { MMX_OP2(pand) }, { MMX_OP2(paddusb) }, { MMX_OP2(paddusw) }, { MMX_OP2(pmaxub) }, { MMX_OP2(pandn) }, { MMX_OP2(pavgb) }, { MMX_OP2(psraw) }, { MMX_OP2(psrad) }, { MMX_OP2(pavgw) }, { MMX_OP2(pmulhuw) }, { MMX_OP2(pmulhw) }, { NULL, gen_helper_cvttpd2dq, gen_helper_cvtdq2pd, gen_helper_cvtpd2dq }, { SSE_SPECIAL , SSE_SPECIAL }, /* movntq, movntq */ { MMX_OP2(psubsb) }, { MMX_OP2(psubsw) }, { MMX_OP2(pminsw) }, { MMX_OP2(por) }, { MMX_OP2(paddsb) }, { MMX_OP2(paddsw) }, { MMX_OP2(pmaxsw) }, { MMX_OP2(pxor) }, { NULL, NULL, NULL, SSE_SPECIAL }, /* lddqu */ { MMX_OP2(psllw) }, { MMX_OP2(pslld) }, { MMX_OP2(psllq) }, { MMX_OP2(pmuludq) }, { MMX_OP2(pmaddwd) }, { MMX_OP2(psadbw) }, { MMX_OP2(maskmov) }, { MMX_OP2(psubb) }, { MMX_OP2(psubw) }, { MMX_OP2(psubl) }, { MMX_OP2(psubq) }, { MMX_OP2(paddb) }, { MMX_OP2(paddw) }, { MMX_OP2(paddl) }, { NULL }};