Could someone in the know please help me to understand
what the assembly corresponding to the following IL is
doing? What I'd like to know is, how are value types
treated with respect to stsfld? There are 5 calls in
the assembly code...to what do they correspond? Moreover,
why does Rotor make calls for these functions rather than
using embedded code?
thanks,
Todd
IL code from System.Decimal::.cctor
-----------------------------------
IL_0000: ldc.i4.0
IL_0001: ldc.i4.0
IL_0002: ldc.i4.0
IL_0003: ldc.i4.0
IL_0004: ldc.i4.0
IL_0005: newobj instance void System.Decimal::.ctor(int32,
int32,
int32,
bool,
unsigned int8)
IL_000a: stsfld valuetype System.Decimal System.Decimal::Zero
FJit assembly generated for the above IL
----------------------------------------
// next 10 lines for the 5 load constant 0's
02D42DB0 33 C0 xor eax,eax
02D42DB2 50 push eax
02D42DB3 33 C0 xor eax,eax
02D42DB5 50 push eax
02D42DB6 33 C0 xor eax,eax
02D42DB8 50 push eax
02D42DB9 33 C0 xor eax,eax
02D42DBB 50 push eax
02D42DBC 33 C0 xor eax,eax
02D42DBE 50 push eax
// subtracting 12 from esp?
02D42DBF 81 C4 F4 FF FF FF add esp,0FFFFFFF4h
// copying 0 params onto the stack space we just reserved...why?
02D42DC5 8B 44 24 0C mov eax,dword ptr [esp+0Ch]
02D42DC9 89 44 24 00 mov dword ptr [esp],eax
02D42DCD 8B 44 24 10 mov eax,dword ptr [esp+10h]
02D42DD1 89 44 24 04 mov dword ptr [esp+4],eax
02D42DD5 8B 44 24 14 mov eax,dword ptr [esp+14h]
02D42DD9 89 44 24 08 mov dword ptr [esp+8],eax
02D42DDD 8B 44 24 18 mov eax,dword ptr [esp+18h]
// didn't this just overwrite the original 5th parameter we pushed?
02D42DE1 89 44 24 0C mov dword ptr [esp+0Ch],eax
// general confusion from here on down...
02D42DE5 8B 54 24 1C mov edx,dword ptr [esp+1Ch]
02D42DE9 8D 44 24 10 lea eax,[esp+10h]
02D42DED 8B C8 mov ecx,eax
02D42DEF 52 push edx
02D42DF0 51 push ecx
02D42DF1 B8 68 45 E5 06 mov eax,6E54568h
02D42DF6 FF 10 call dword ptr [eax]
02D42DF8 83 C4 18 add esp,18h
02D42DFB B8 3C 44 E5 06 mov eax,6E5443Ch
02D42E00 50 push eax
02D42E01 B8 00 52 35 79 mov eax,79355200h
02D42E06 FF D0 call eax
02D42E08 83 C4 04 add esp,4
02D42E0B B8 7C 2D E5 06 mov eax,6E52D7Ch
02D42E10 50 push eax
02D42E11 B8 3E 33 35 79 mov eax,7935333Eh
02D42E16 FF D0 call eax
02D42E18 83 C4 04 add esp,4
02D42E1B 50 push eax
02D42E1C 8D 44 24 04 lea eax,[esp+4]
02D42E20 50 push eax
02D42E21 B8 10 00 00 00 mov eax,10h
02D42E26 50 push eax
02D42E27 E8 01 00 00 00 call 02D42E2D
02D42E2C 00 59 51 add byte ptr [ecx+51h],bl
02D42E2F B8 98 18 71 79 mov eax,79711898h
02D42E34 FF D0 call eax
02D42E36 83 C4 10 add esp,10h
02D42E39 83 C4 10 add esp,10h
===================================
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