C#顶级语句的主函数
起因
在做一个测试使用的顶级语句,要把汇编显示出来的时候,发现指定生成汇编代码的方法Main的时候,是没有生成汇编代码,于是看看顶级语句和普通的Main函数有什么差异.顶级语句
Console.WriteLine("hello csharp");#输出Main方法的汇编代码
$env:DOTNET_JitDisasm="Main"
于是将使用顶级语句生成的dll(动态库),进行反编译看看有没有Main函数
using System;
using System.Runtime.CompilerServices;
[CompilerGenerated] //使用顶级语句,在编译时,自动生成Program
internal class Program
{
private static void <Main>$(string[] args) //没有生成Main函数,而是叫<Main>$
{
Console.WriteLine("hello csharp");
}
}所以要修改一下指定的函数名称:
#顶级语句,不是Main,而是<Main>$
$env:DOTNET_JitDisasm="<Main>$"; Assembly listing for method Program:<Main>$(System.String[])
; Emitting BLENDED_CODE for X64 with AVX - Windows
; debuggable code
; rbp based frame
; fully interruptible
; No PGO data
; Final local variable assignments
;
; V00 arg0 [V00 ] ( 1, 1 ) ref -> [rbp+10H] do-not-enreg[] class-hnd
; V01 OutArgs [V01 ] ( 1, 1 ) struct (32) [rsp+00H] do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
;
; Lcl frame size = 40
G_M56640_IG01: ;; offset=0000H
push rbp
push rdi
sub rsp, 40
lea rbp, [rsp+30H]
mov gword ptr [rbp+10H], rcx
;; size=15 bbWeight=1 PerfScore 3.75
G_M56640_IG02: ;; offset=000FH
cmp dword ptr [(reloc 0x7ffc2a49b7e0)], 0
je SHORT G_M56640_IG04
;; size=9 bbWeight=1 PerfScore 4.00
G_M56640_IG03: ;; offset=0018H
call CORINFO_HELP_DBG_IS_JUST_MY_CODE
;; size=5 bbWeight=0.50 PerfScore 0.50
G_M56640_IG04: ;; offset=001DH
mov rcx, 0x1E8008317E8 ; 'hello csharp'
call [System.Console:WriteLine(System.String)]
nop
nop
;; size=18 bbWeight=1 PerfScore 3.75
G_M56640_IG05: ;; offset=002FH
add rsp, 40
pop rdi
pop rbp
ret
;; size=7 bbWeight=1 PerfScore 2.25
; Total bytes of code 54, prolog size 15, PerfScore 19.65, instruction count 16, allocated bytes for code 54 (MethodHash=79b422bf) ; for method Program:<Main>$(System.String[])
; ============================================================
hello csharp
秋风
2023-05-14