clang/test/CodeGen/ifunc-win.c

   1 // RUN: %clang_cc1 -triple aarch64-pc-windows-msvc -emit-llvm -o - %s | FileCheck %s
   2 // RUN: %clang_cc1 -triple aarch64-pc-windows-msvc -O2 -emit-llvm -o - %s | FileCheck %s
   3 // RUN: %clang_cc1 -triple aarch64-pc-windows-msvc -fsanitize=thread -O2 -emit-llvm -o - %s | FileCheck %s --check-prefix=SAN
   4 // RUN: %clang_cc1 -triple aarch64-pc-windows-msvc -fsanitize=address -O2 -emit-llvm -o - %s | FileCheck %s --check-prefix=SAN
   5
   6 // REQUIRES: aarch64-registered-target
   7
   8 int foo(int) __attribute__ ((ifunc("foo_ifunc")));
   9
  10 static int f1(int i) {
  11   return i + 1;
  12 }
  13
  14 static int f2(int i) {
  15   return i + 2;
  16 }
  17
  18 typedef int (*foo_t)(int);
  19
  20 volatile int global;
  21
  22 static foo_t foo_ifunc(void) {
  23   return global ? f1 : f2;
  24 }
  25
  26 int bar(void) {
  27   return foo(1);
  28 }
  29
  30 extern void goo(void);
  31
  32 void bar2(void) {
  33   goo();
  34 }
  35
  36 extern void goo(void) __attribute__ ((ifunc("goo_ifunc")));
  37
  38 void* goo_ifunc(void) {
  39   return 0;
  40 }
  41
  42 /// The ifunc is emitted after its resolver.
  43 void *hoo_ifunc(void) { return 0; }
  44 extern void hoo(int) __attribute__ ((ifunc("hoo_ifunc")));
  45
  46 /// ifunc on Windows is lowered to global pointers and an indirect call.
  47 // CHECK: @global = dso_local global i32 0, align 4
  48 // CHECK: {{.*}} = internal{{.*}}global{{.*}}poison, align 8
  49 /// Register the constructor for initialisation.
  50 // CHECK: @llvm.global_ctors = appending global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 10, ptr @{{.*}}, ptr null }]
  51
  52 // CHECK-LABEL: @bar()
  53 // CHECK   %0 = load ptr, ptr @0, align 8
  54 // CHECK   %call = call i32 %0(i32 noundef 1)
  55
  56 // CHECK-LABEL: @bar2()
  57 // CHECK %0 = load ptr, ptr getelementptr inbounds ([3 x ptr], ptr @0, i32 0, i32 1), align 8
  58 // CHECK call void %0()
  59
  60 // CHECK: define internal void @{{.*}}()
  61
  62 // SAN: define {{(dso_local )?}}noalias {{(noundef )?}}ptr @goo_ifunc() {{(local_unnamed_addr )?}}
  63
  64 // SAN: define {{(dso_local )?}}noalias {{(noundef )?}}ptr @hoo_ifunc() {{(local_unnamed_addr )?}}
  65
  66 // SAN: define internal {{(fastcc )?}}{{(noundef )?}}nonnull ptr @foo_ifunc() {{(unnamed_addr )?}}
  67