test.ll

; ModuleID = '751b7120e2d883b75150f3fcec6559f0-Program'
source_filename = "751b7120e2d883b75150f3fcec6559f0-Program"
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-msvc"

%threedoubles = type { double, double, double }

define void @TEST(i8*) personality i8* bitcast (void()* @__CxxFrameHandler3 to i8*) {
BasicBlock0:
  %1 = alloca i8*, align 4
  store i8* %0, i8** %1
  %2 = alloca i32
  store i32 0, i32* %2
  
  ; << replace the localsescape below with this and it gives the wrong values.
  ;%3 = alloca %threedoubles
  ;store %threedoubles zeroinitializer, %threedoubles* %3
  ;call void (...) @llvm.localescape(i8** %1, i32* %2, %threedoubles* %3)

  call void (...) @llvm.localescape(i8** %1, i32* %2)
  %q4 = load i8*, i8** %1
  invoke void @LogI8P(i8* %q4) 
    to label %Resume unwind label %Exception

Resume:
  %loctmp = call i8* @llvm.localaddress()
  call void @"TEST$Fin0"(i8 0, i8* %loctmp)
  ret void

Exception:
  %exceptcleanuppad = cleanuppad within none []
  %exceptcleanuppadla = call i8* @llvm.localaddress()
  call void @"TEST$Fin0"(i8 1, i8* %exceptcleanuppadla) [ "funclet"(token %exceptcleanuppad) ]
  cleanupret from %exceptcleanuppad unwind to caller
}

declare void @__CxxFrameHandler3()

; Function Attrs: nounwind
declare void @llvm.localescape(...) 
declare i8* @llvm.localaddress() 

declare void @LogI8P(i8*)

; Function Attrs: noinline
define void @"TEST$Fin0"(i8, i8*)  {
BasicBlock8:
  %2 = call i8* @llvm.localrecover(i8* bitcast (void (i8*)* @TEST to i8*), i8* %1, i32 0)
  %3 = bitcast i8* %2 to i8**
  %4 = load i8*, i8** %3
  call void @LogI8P(i8* %4)
  ret void
}

; Function Attrs: nounwind readnone
declare i8* @llvm.localrecover(i8*, i8*, i32)



 ; helper.c
 ; compiled with: clang helper.c myfile.ll -o helper.exe
 
 #include <stdio.h>

void TEST(void* p);
void LogI8P(void* p) { printf("Logging pointer %p\r\n", p);}

void main() {
  int a;
  LogI8P(&a);
  TEST(&a);
}


; running as is prints:
; - Logging pointer 0093FC54
; - Logging pointer 0093FC54
; - Logging pointer 0093FC54

; replacing the existing llvm.localescape with the commented version:
; Logging pointer 00EFFB50
; Logging pointer 00EFFB50
; Logging pointer 00EFFB44