clang/test/CodeGen/catch-alignment-assumption-attribute-alloc_align-on-function-variable.cpp

   1 // RUN: %clang_cc1 -no-opaque-pointers -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
   2 // RUN: %clang_cc1 -no-opaque-pointers -fsanitize=alignment -fno-sanitize-recover=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-ANYRECOVER,CHECK-SANITIZE-NORECOVER,CHECK-SANITIZE-UNREACHABLE
   3 // RUN: %clang_cc1 -no-opaque-pointers -fsanitize=alignment -fsanitize-recover=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-ANYRECOVER,CHECK-SANITIZE-RECOVER
   4 // RUN: %clang_cc1 -no-opaque-pointers -fsanitize=alignment -fsanitize-trap=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-TRAP,CHECK-SANITIZE-UNREACHABLE
   5
   6 // CHECK-SANITIZE-ANYRECOVER: @[[CHAR:.*]] = {{.*}} c"'char **'\00" }
   7 // CHECK-SANITIZE-ANYRECOVER: @[[LINE_100_ALIGNMENT_ASSUMPTION:.*]] = {{.*}}, i32 100, i32 10 }, {{.*}}* @[[CHAR]] }
   8
   9 char **__attribute__((alloc_align(2)))
  10 passthrough(char **x, unsigned long alignment) {
  11   // CHECK:      define{{.*}} i8** @[[PASSTHROUGH:.*]](i8** noundef %[[X:.*]], i64 noundef %[[ALIGNMENT:.*]])
  12   // CHECK-NEXT: entry:
  13   // CHECK-NEXT:   %[[X_ADDR:.*]] = alloca i8**, align 8
  14   // CHECK-NEXT:   %[[ALIGNMENT_ADDR:.*]] = alloca i64, align 8
  15   // CHECK-NEXT:   store i8** %[[X]], i8*** %[[X_ADDR]], align 8
  16   // CHECK-NEXT:   store i64 %[[ALIGNMENT]], i64* %[[ALIGNMENT_ADDR]], align 8
  17   // CHECK-NEXT:   %[[X_RELOADED:.*]] = load i8**, i8*** %[[X_ADDR]], align 8
  18   // CHECK-NEXT:   ret i8** %[[X_RELOADED]]
  19   // CHECK-NEXT: }
  20   return x;
  21 }
  22
  23 char **caller(char **x, unsigned long alignment) {
  24   // CHECK:                           define{{.*}} i8** @{{.*}}(i8** noundef %[[X:.*]], i64 noundef %[[ALIGNMENT:.*]])
  25   // CHECK-NEXT:                      entry:
  26   // CHECK-NEXT:                        %[[X_ADDR:.*]] = alloca i8**, align 8
  27   // CHECK-NEXT:                        %[[ALIGNMENT_ADDR:.*]] = alloca i64, align 8
  28   // CHECK-NEXT:                        store i8** %[[X]], i8*** %[[X_ADDR]], align 8
  29   // CHECK-NEXT:                        store i64 %[[ALIGNMENT]], i64* %[[ALIGNMENT_ADDR]], align 8
  30   // CHECK-NEXT:                        %[[X_RELOADED:.*]] = load i8**, i8*** %[[X_ADDR]], align 8
  31   // CHECK-NEXT:                        %[[ALIGNMENT_RELOADED:.*]] = load i64, i64* %[[ALIGNMENT_ADDR]], align 8
  32   // CHECK-NEXT:                        %[[X_RETURNED:.*]] = call noundef i8** @[[PASSTHROUGH]](i8** noundef %[[X_RELOADED]], i64 noundef %[[ALIGNMENT_RELOADED]])
  33   // CHECK-SANITIZE-NEXT:               %[[PTRINT:.*]] = ptrtoint i8** %[[X_RETURNED]] to i64
  34   // CHECK-SANITIZE-NEXT:               %[[MASK:.*]] = sub i64 %[[ALIGNMENT_RELOADED]], 1
  35   // CHECK-SANITIZE-NEXT:               %[[MASKEDPTR:.*]] = and i64 %[[PTRINT]], %[[MASK]]
  36   // CHECK-SANITIZE-NEXT:               %[[MASKCOND:.*]] = icmp eq i64 %[[MASKEDPTR]], 0
  37   // CHECK-SANITIZE-NEXT:               %[[PTRINT_DUP:.*]] = ptrtoint i8** %[[X_RETURNED]] to i64, !nosanitize
  38   // CHECK-SANITIZE-NEXT:               br i1 %[[MASKCOND]], label %[[CONT:.*]], label %[[HANDLER_ALIGNMENT_ASSUMPTION:[^,]+]],{{.*}} !nosanitize
  39   // CHECK-SANITIZE:                  [[HANDLER_ALIGNMENT_ASSUMPTION]]:
  40   // CHECK-SANITIZE-NORECOVER-NEXT:     call void @__ubsan_handle_alignment_assumption_abort(i8* bitcast ({ {{{.*}}}, {{{.*}}}, {{{.*}}}* }* @[[LINE_100_ALIGNMENT_ASSUMPTION]] to i8*), i64 %[[PTRINT_DUP]], i64 %[[ALIGNMENT_RELOADED]], i64 0){{.*}}, !nosanitize
  41   // CHECK-SANITIZE-RECOVER-NEXT:       call void @__ubsan_handle_alignment_assumption(i8* bitcast ({ {{{.*}}}, {{{.*}}}, {{{.*}}}* }* @[[LINE_100_ALIGNMENT_ASSUMPTION]] to i8*), i64 %[[PTRINT_DUP]], i64 %[[ALIGNMENT_RELOADED]], i64 0){{.*}}, !nosanitize
  42   // CHECK-SANITIZE-TRAP-NEXT:          call void @llvm.ubsantrap(i8 23){{.*}}, !nosanitize
  43   // CHECK-SANITIZE-UNREACHABLE-NEXT:   unreachable, !nosanitize
  44   // CHECK-SANITIZE:                  [[CONT]]:
  45   // CHECK-NEXT:                        call void @llvm.assume(i1 true) [ "align"(i8** %[[X_RETURNED]], i64 %1) ]
  46   // CHECK-NEXT:                        ret i8** %[[X_RETURNED]]
  47   // CHECK-NEXT:                      }
  48 #line 100
  49   return passthrough(x, alignment);
  50 }