问题描述
关注
Cannot compile CSCORE after retargeting to .NET 4.7.2
和
Failure using ilasm,but no reason given
尝试在VS2019中构建CSCore。最初，postbuild脚本的路径与我的环境不兼容，因此我对其进行了修复。现在它可以工作了，只是它在调用InlineILCompiler来在库中注入CLR代码时会破坏postbuild脚本。
更确切地说，它在调用外部ilasm.exe并使用“ disasm.il”作为输入重新组装所有内容时，在InlineILCompiler \ Program.cs的第350行处中断。
我设法获得disasm.il的副本，然后将其删除，然后我尝试自己重新发出ilasm命令，并使用InlineILCompiler提供的相同参数...并且失败，像这样：
[...looong output here]
Assembled method CSCore.Codecs.AIFF.AiffBinaryReader::ReadUInt32
Assembled method CSCore.Codecs.AIFF.AiffBinaryReader::ReadInt16
Assembled method CSCore.Codecs.AIFF.AiffBinaryReader::ReadUInt16
Assembled method CSCore.Codecs.AIFF.AiffBinaryReader::Skip
Assembled method CSCore.Codecs.AIFF.AiffBinaryReader::ReadBytes
D:\cscore-master\CSCore\Codecs\AIFF\AiffBinaryReader.cs(97) : error : syntax error at token '-' in: IL_00ad: ldc.r8 -nan(ind)
我对IL的了解不多，但是我仍然进行了调查，发现违规行似乎被封锁了：
.method private hidebysig instance float64
ConvertFromIeeeExtended(uint8[] bytes) cil managed
{
// Code size 275 (0x113)
.maxstack 8
.locals init ([0] float64 f,[1] int32 expon,[2] uint64 hiMant,[3] uint64 loMant,[4] bool V_4,[5] bool V_5,[6] bool V_6,[7] float64 V_7)
.line 75,75 : 9,10 ''
IL_0000: nop
.line 80,80 : 13,66 ''
IL_0001: ldarg.1
IL_0002: ldc.i4.0
IL_0003: ldelem.u1
IL_0004: ldc.i4.s 127
IL_0006: and
IL_0007: ldc.i4.8
IL_0008: shl
IL_0009: ldarg.1
IL_000a: ldc.i4.1
IL_000b: ldelem.u1
IL_000c: ldc.i4 0xff
IL_0011: and
IL_0012: or
IL_0013: stloc.1
.line 81,84 : 13,50 ''
IL_0014: ldarg.1
IL_0015: ldc.i4.2
IL_0016: ldelem.u1
IL_0017: ldc.i4 0xff
IL_001c: and
IL_001d: conv.i8
IL_001e: ldc.i4.s 24
IL_0020: shl
IL_0021: ldarg.1
IL_0022: ldc.i4.3
IL_0023: ldelem.u1
IL_0024: ldc.i4 0xff
IL_0029: and
IL_002a: conv.i8
IL_002b: ldc.i4.s 16
IL_002d: shl
IL_002e: or
IL_002f: ldarg.1
IL_0030: ldc.i4.4
IL_0031: ldelem.u1
IL_0032: ldc.i4 0xff
IL_0037: and
IL_0038: conv.i8
IL_0039: ldc.i4.8
IL_003a: shl
IL_003b: or
IL_003c: ldarg.1
IL_003d: ldc.i4.5
IL_003e: ldelem.u1
IL_003f: ldc.i4 0xff
IL_0044: and
IL_0045: conv.i8
IL_0046: or
IL_0047: stloc.2
.line 85,88 : 13,50 ''
IL_0048: ldarg.1
IL_0049: ldc.i4.6
IL_004a: ldelem.u1
IL_004b: ldc.i4 0xff
IL_0050: and
IL_0051: conv.i8
IL_0052: ldc.i4.s 24
IL_0054: shl
IL_0055: ldarg.1
IL_0056: ldc.i4.7
IL_0057: ldelem.u1
IL_0058: ldc.i4 0xff
IL_005d: and
IL_005e: conv.i8
IL_005f: ldc.i4.s 16
IL_0061: shl
IL_0062: or
IL_0063: ldarg.1
IL_0064: ldc.i4.8
IL_0065: ldelem.u1
IL_0066: ldc.i4 0xff
IL_006b: and
IL_006c: conv.i8
IL_006d: ldc.i4.8
IL_006e: shl
IL_006f: or
IL_0070: ldarg.1
IL_0071: ldc.i4.s 9
IL_0073: ldelem.u1
IL_0074: ldc.i4 0xff
IL_0079: and
IL_007a: conv.i8
IL_007b: or
IL_007c: stloc.3
.line 90,90 : 13,58 ''
IL_007d: ldloc.1
IL_007e: brtrue.s IL_008a
IL_0080: ldloc.2
IL_0081: brtrue.s IL_008a
IL_0083: ldloc.3
IL_0084: ldc.i4.0
IL_0085: conv.i8
IL_0086: ceq
IL_0088: br.s IL_008b
IL_008a: ldc.i4.0
IL_008b: stloc.s V_4
.line 16707566,16707566 : 0,0 ''
IL_008d: ldloc.s V_4
IL_008f: brfalse.s IL_009d
.line 91,91 : 17,23 ''
IL_0091: ldc.r8 0.0
IL_009a: stloc.0
IL_009b: br.s IL_00ef
.line 93,93 : 13,14 ''
IL_009d: nop
.line 94,94 : 17,37 ''
IL_009e: ldloc.1
IL_009f: ldc.i4 0x7fff
IL_00a4: ceq
IL_00a6: stloc.s V_5
.line 16707566,0 ''
IL_00a8: ldloc.s V_5
IL_00aa: brfalse.s IL_00ba
.line 95,95 : 17,18 ''
IL_00ac: nop
.line 97,97 : 21,36 ''
IL_00ad: ldc.r8 -nan(ind)
IL_00b6: stloc.0
.line 98,98 : 17,18 ''
IL_00b7: nop
IL_00b8: br.s IL_00ee
.line 100,100 : 17,18 ''
IL_00ba: nop
.line 101,101 : 21,36 ''
IL_00bb: ldloc.1
IL_00bc: ldc.i4 0x3fff
IL_00c1: sub
IL_00c2: stloc.1
.line 102,102 : 21,69 ''
IL_00c3: ldarg.0
IL_00c4: ldarg.0
IL_00c5: ldloc.2
IL_00c6: call instance float64 CSCore.Codecs.AIFF.AiffBinaryReader::UnsignedToFloat(uint64)
IL_00cb: ldloc.1
IL_00cc: ldc.i4.s 31
IL_00ce: sub
IL_00cf: dup
IL_00d0: stloc.1
IL_00d1: call instance float64 CSCore.Codecs.AIFF.AiffBinaryReader::ldexp(float64,int32)
IL_00d6: stloc.0
.line 103,103 : 21,70 ''
IL_00d7: ldloc.0
IL_00d8: ldarg.0
IL_00d9: ldarg.0
IL_00da: ldloc.3
IL_00db: call instance float64 CSCore.Codecs.AIFF.AiffBinaryReader::UnsignedToFloat(uint64)
IL_00e0: ldloc.1
IL_00e1: ldc.i4.s 32
IL_00e3: sub
IL_00e4: dup
IL_00e5: stloc.1
IL_00e6: call instance float64 CSCore.Codecs.AIFF.AiffBinaryReader::ldexp(float64,int32)
IL_00eb: add
IL_00ec: stloc.0
.line 104,104 : 17,18 ''
IL_00ed: nop
.line 105,105 : 13,14 ''
IL_00ee: nop
.line 107,107 : 13,43 ''
IL_00ef: ldarg.1
IL_00f0: ldc.i4.0
IL_00f1: ldelem.u1
IL_00f2: ldc.i4 0x80
IL_00f7: and
IL_00f8: ldc.i4 0x80
IL_00fd: ceq
IL_00ff: stloc.s V_6
.line 16707566,0 ''
IL_0101: ldloc.s V_6
IL_0103: brfalse.s IL_010b
.line 108,108 : 17,27 ''
IL_0105: ldloc.0
IL_0106: neg
IL_0107: stloc.s V_7
IL_0109: br.s IL_0110
.line 109,109 : 13,22 ''
IL_010b: ldloc.0
IL_010c: stloc.s V_7
IL_010e: br.s IL_0110
.line 110,110 : 9,10 ''
IL_0110: ldloc.s V_7
IL_0112: ret
} // end of method AiffBinaryReader::ConvertFromIeeeExtended
更准确地说，-nan（ind）行：
.line 95,18 ''
IL_00b7: nop
IL_00b8: br.s IL_00ee
不确定现在该怎么办，知道吗？谢谢。
解决方法
这是 Visual Studio 中的错误，已报告但未解决。为了克服它，我更改了 Codecs.AIFF 中 AiffBinaryReader 的来源。
if (expon == 0x7FFF)
{
/* Infinity or NaN */
f = double.NaN;
}
变成
if (expon == 0x7FFF)
{
/* Infinity or NaN */
f = 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
f = f * 1000;
}
不完全是 INFINITY 但肯定是一个很大的数量，足以让 CsCore 工作和 VS 编译它！成功。
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