clang/test/CodeGen/kmsan-param-retval.c

   1 // RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -O2 -fsanitize=kernel-memory -no-enable-noundef-analysis -o - %s | \
   2 // RUN:     FileCheck %s --check-prefix=CLEAN
   3 // RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -O2 -fsanitize=kernel-memory -fno-sanitize-memory-param-retval -o - %s | \
   4 // RUN:     FileCheck %s --check-prefixes=NOUNDEF,NOUNDEF_ONLY
   5 // RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -O2 -fsanitize=kernel-memory -mllvm -msan-eager-checks -o - %s | \
   6 // RUN:     FileCheck %s --check-prefixes=NOUNDEF,EAGER
   7 // RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -O2 -fsanitize=kernel-memory -no-enable-noundef-analysis -fsanitize-memory-param-retval -o - %s | \
   8 // RUN:     FileCheck %s --check-prefixes=CLEAN
   9 // RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -O2 -fsanitize=kernel-memory -o - %s | \
  10 // RUN:     FileCheck %s --check-prefixes=NOUNDEF,EAGER
  11
  12 void foo();
  13
  14 void bar(int x) {
  15   if (x)
  16     foo();
  17 }
  18
  19
  20 // CLEAN:   define dso_local void @bar(i32 %x)
  21 // NOUNDEF: define dso_local void @bar(i32 noundef %x)
  22 //
  23 // %param_shadow assignment gets optimized away with -O2, because it is at the beginning of the
  24 // struct returned by __msan_get_context_state(). Use %param_origin as a sign that the shadow of
  25 // the first argument is being used.
  26 //
  27 // Without noundef analysis, KMSAN emits metadata checks for the function parameter.
  28 // CLEAN:        load i32, ptr %param_origin
  29 //
  30 // With noundef analysis enabled, but without eager checks, KMSAN still emits metadata checks,
  31 // although the parameter is known to be defined.
  32 // NOUNDEF_ONLY: load i32, ptr %param_origin
  33 //
  34 // With noundef analysis and eager checks enabled, KMSAN won't emit metadata checks for function
  35 // parameters.
  36 // EAGER-NOT:    load i32, ptr %param_origin