这些操作码有什么用？

发布于 2024-07-23 11:54:42 字数 787 浏览 4 评论 0原文

使用反射器，我得到以下输出：

.method private hidebysig static class myModelTestarea.Foo Method() cil managed
{
  .maxstack 1
  .locals init ([0] class myModelTestarea.Foo CS$1$0000)
  L_0000: nop 
  L_0001: ldc.i4.0 
  L_0002: newarr object
  L_0007: call object myModelTestarea.Program::Resolve(object[])
  L_000c: castclass myModelTestarea.Foo
  L_0011: stloc.0 
  L_0012: br.s L_0014
  L_0014: ldloc.0 
  L_0015: ret 
}

？

private static Foo Method()
{
  return (Foo)Resolve();
}

private static object Resolve( params object[] args )
{
  return new Foo();
}

第 11-14 行做什么我调用一个函数并得到结果（第 7 行）。我将结果转换为正确的返回类型（c 行） - 为什么不立即返回？

不知何故，转换结果存储为局部变量 - 然后无条件跳转到下一行，再次加载局部变量。为什么？

在我看来，第 11-14 行和局部变量可以省略...？

原文

Using reflector I get the following output:

.method private hidebysig static class myModelTestarea.Foo Method() cil managed
{
  .maxstack 1
  .locals init ([0] class myModelTestarea.Foo CS$1$0000)
  L_0000: nop 
  L_0001: ldc.i4.0 
  L_0002: newarr object
  L_0007: call object myModelTestarea.Program::Resolve(object[])
  L_000c: castclass myModelTestarea.Foo
  L_0011: stloc.0 
  L_0012: br.s L_0014
  L_0014: ldloc.0 
  L_0015: ret 
}

for

private static Foo Method()
{
  return (Foo)Resolve();
}

private static object Resolve( params object[] args )
{
  return new Foo();
}

What do the lines 11-14 do? I call a function and get a result (line 7). I cast the result to the right returntype (line c) - why not return right now?

Somehow, the casted result is stored as a local variable - then there is an uncoditional jump to the next line, where the local variable is loaded again. Why?

In my opinion line 11-14 and the local variable can be omitted ... ?

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不及他 2024-07-30 11:54:42

这看起来像一个 DEBUG 构建，它留下了额外的 IL 来帮助调试器。在 RELEASE 中再试一次，它应该看起来更干净，并进行了优化等。

.method private hidebysig static class program/Foo Method() cil managed
{
    .maxstack 8
    L_0000: ldc.i4.0 
    L_0001: newarr object
    L_0006: call object program::Resolve(object[])
    L_000b: castclass program/Foo
    L_0010: ret 
}

That looks like a DEBUG build, which leaves in extra IL to help the debugger. Try it again in RELEASE and it should look cleaner, with optimization etc.

.method private hidebysig static class program/Foo Method() cil managed
{
    .maxstack 8
    L_0000: ldc.i4.0 
    L_0001: newarr object
    L_0006: call object program::Resolve(object[])
    L_000b: castclass program/Foo
    L_0010: ret 
}

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