33 lines · c
1// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 22// REQUIRES: bpf-registered-target3// RUN: %clang_cc1 -triple bpf -disable-llvm-passes -emit-llvm -o - %s | FileCheck %s4 5// Check that call to preserve.static.offset is generated when array6// member of a struct marked with __attribute__((preserve_static_offset))7// is accessed.8 9#define __ctx __attribute__((preserve_static_offset))10 11struct foo {12 struct {13 int a;14 } b[7];15} __ctx;16 17// CHECK-LABEL: define dso_local i32 @arr_access18// CHECK-SAME: (ptr noundef [[P:%.*]]) #[[ATTR0:[0-9]+]] {19// CHECK-NEXT: entry:20// CHECK-NEXT: [[P_ADDR:%.*]] = alloca ptr, align 821// CHECK-NEXT: store ptr [[P]], ptr [[P_ADDR]], align 822// CHECK-NEXT: [[TMP0:%.*]] = load ptr, ptr [[P_ADDR]], align 823// CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.preserve.static.offset(ptr [[TMP0]])24// CHECK-NEXT: [[B:%.*]] = getelementptr inbounds nuw [[STRUCT_FOO:%.*]], ptr [[TMP1]], i32 0, i32 025// CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [7 x %struct.anon], ptr [[B]], i64 0, i64 226// CHECK-NEXT: [[A:%.*]] = getelementptr inbounds nuw [[STRUCT_ANON:%.*]], ptr [[ARRAYIDX]], i32 0, i32 027// CHECK-NEXT: [[TMP2:%.*]] = load i32, ptr [[A]], align 428// CHECK-NEXT: ret i32 [[TMP2]]29//30int arr_access(struct foo *p) {31 return p->b[2].a;32}33