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December 15, 2015 20:28
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Call-By-Ref vs Call-By-Value
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| IL_0001: ldstr "bar" | |
| IL_0006: stloc.0 // str | |
| IL_0007: ldarg.0 | |
| IL_0008: ldloc.0 // ldloc loads the variable onto the stack | |
| IL_0009: call UserQuery.Foo | |
| Foo: | |
| IL_0000: nop | |
| IL_0001: ldarg.1 | |
| IL_0002: callvirt System.String.ToUpper | |
| IL_0007: starg.s 01 | |
| IL_0009: ldc.i4.1 | |
| IL_000A: stloc.0 // CS$1$0000 | |
| IL_000B: br.s IL_000D | |
| IL_000D: ldloc.0 // CS$1$0000 | |
| IL_000E: ret |
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| IL_0001: ldstr "bar" | |
| IL_0006: stloc.0 // str | |
| IL_0007: ldarg.0 | |
| IL_0008: ldloca.s 00 // ldloca loads the *address* of the variable onto the stack | |
| IL_000A: call UserQuery.Foo | |
| Foo: | |
| IL_0000: nop | |
| IL_0001: ldarg.1 | |
| IL_0002: ldarg.1 | |
| IL_0003: ldind.ref // ldind gets the object reference from the passed address | |
| IL_0004: callvirt System.String.ToUpper | |
| IL_0009: stind.ref // stind stores the new object reference at the passed address | |
| IL_000A: ldc.i4.1 | |
| IL_000B: stloc.0 // CS$1$0000 | |
| IL_000C: br.s IL_000E | |
| IL_000E: ldloc.0 // CS$1$0000 | |
| IL_000F: ret |
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