Use #pragma once header guard. am: 0cd3943fb8 am: a9b336ef84 am: b2c0842e51 am: 5458702d07 am: 291b5c3926android-13.0.0_r49android-13.0.0_r48android-13.0.0_r47android-13.0.0_r46android-13.0.0_r45android-13.0.0_r44android-13.0.0_r43android-13.0.0_r42android-13.0.0_r41android-13.0.0_r40android-13.0.0_r39android-13.0.0_r38android-13.0.0_r37android-13.0.0_r36android-13.0.0_r35android-13.0.0_r34android-13.0.0_r33android-13.0.0_r32android13-qpr2-s9-releaseandroid13-qpr2-s8-releaseandroid13-qpr2-s7-releaseandroid13-qpr2-s6-releaseandroid13-qpr2-s5-releaseandroid13-qpr2-s3-releaseandroid13-qpr2-s2-releaseandroid13-qpr2-s12-releaseandroid13-qpr2-s11-releaseandroid13-qpr2-s10-releaseandroid13-qpr2-s1-releaseandroid13-qpr2-releaseandroid13-qpr2-b-s1-releaseandroid13-d4-s2-releaseandroid13-d4-s1-releaseandroid13-d4-release

Original change: https://android-review.googlesource.com/c/platform/system/unwinding/+/2070169

Change-Id: I3ed4c04bd0446b5ab4b2ffae7003a2f2e2a5c9af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

83 files changed, 83 insertions, 331 deletions

diff --git a/libunwindstack/ArmExidx.h b/libunwindstack/ArmExidx.h
index d9fc371..847613a 100644
--- a/libunwindstack/ArmExidx.h
+++ b/libunwindstack/ArmExidx.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_ARM_EXIDX_H
-#define _LIBUNWINDSTACK_ARM_EXIDX_H
+#pragma once
 
 #include <stdint.h>
 
@@ -122,5 +121,3 @@ class ArmExidx {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_ARM_EXIDX_H
diff --git a/libunwindstack/Check.h b/libunwindstack/Check.h
index 493bc00..102cbb1 100644
--- a/libunwindstack/Check.h
+++ b/libunwindstack/Check.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_CHECK_H
-#define _LIBUNWINDSTACK_CHECK_H
+#pragma once
 
 #include <stdlib.h>
 
@@ -30,5 +29,3 @@ namespace unwindstack {
   }
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_CHECK_H
diff --git a/libunwindstack/DexFile.h b/libunwindstack/DexFile.h
index 6775530..3bb65da 100644
--- a/libunwindstack/DexFile.h
+++ b/libunwindstack/DexFile.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DEX_FILE_H
-#define _LIBUNWINDSTACK_DEX_FILE_H
+#pragma once
 
 #include <stdint.h>
 
@@ -80,5 +79,3 @@ class DexFile {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DEX_FILE_H
diff --git a/libunwindstack/DwarfCfa.h b/libunwindstack/DwarfCfa.h
index c4425bd..e9656e5 100644
--- a/libunwindstack/DwarfCfa.h
+++ b/libunwindstack/DwarfCfa.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_CFA_H
-#define _LIBUNWINDSTACK_DWARF_CFA_H
+#pragma once
 
 #include <stdint.h>
 
@@ -270,5 +269,3 @@ class DwarfCfa {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_CFA_H
diff --git a/libunwindstack/DwarfDebugFrame.h b/libunwindstack/DwarfDebugFrame.h
index 635cefd..017568d 100644
--- a/libunwindstack/DwarfDebugFrame.h
+++ b/libunwindstack/DwarfDebugFrame.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_DEBUG_FRAME_H
-#define _LIBUNWINDSTACK_DWARF_DEBUG_FRAME_H
+#pragma once
 
 #include <stdint.h>
 
@@ -46,5 +45,3 @@ class DwarfDebugFrame : public DwarfSectionImpl<AddressType> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_DEBUG_FRAME_H
diff --git a/libunwindstack/DwarfEhFrame.h b/libunwindstack/DwarfEhFrame.h
index 7a41e45..93befd4 100644
--- a/libunwindstack/DwarfEhFrame.h
+++ b/libunwindstack/DwarfEhFrame.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_EH_FRAME_H
-#define _LIBUNWINDSTACK_DWARF_EH_FRAME_H
+#pragma once
 
 #include <stdint.h>
 
@@ -45,5 +44,3 @@ class DwarfEhFrame : public DwarfSectionImpl<AddressType> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_EH_FRAME_H
diff --git a/libunwindstack/DwarfEhFrameWithHdr.h b/libunwindstack/DwarfEhFrameWithHdr.h
index f7c010c..d074b7b 100644
--- a/libunwindstack/DwarfEhFrameWithHdr.h
+++ b/libunwindstack/DwarfEhFrameWithHdr.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H
-#define _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H
+#pragma once
 
 #include <stdint.h>
 
@@ -82,5 +81,3 @@ class DwarfEhFrameWithHdr : public DwarfSectionImpl<AddressType> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_EH_FRAME_WITH_HDR_H
diff --git a/libunwindstack/DwarfEncoding.h b/libunwindstack/DwarfEncoding.h
index 20db222..c9fbf24 100644
--- a/libunwindstack/DwarfEncoding.h
+++ b/libunwindstack/DwarfEncoding.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_ENCODING_H
-#define _LIBUNWINDSTACK_DWARF_ENCODING_H
+#pragma once
 
 #include <stdint.h>
 
@@ -47,5 +46,3 @@ enum DwarfEncoding : uint8_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_ENCODING_H
diff --git a/libunwindstack/DwarfOp.h b/libunwindstack/DwarfOp.h
index ac9fd2d..2f33465 100644
--- a/libunwindstack/DwarfOp.h
+++ b/libunwindstack/DwarfOp.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_OP_H
-#define _LIBUNWINDSTACK_DWARF_OP_H
+#pragma once
 
 #include <stdint.h>
 
@@ -140,5 +139,3 @@ class DwarfOp {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_OP_H
diff --git a/libunwindstack/ElfInterfaceArm.h b/libunwindstack/ElfInterfaceArm.h
index 9bfad0b..6ee6dc9 100644
--- a/libunwindstack/ElfInterfaceArm.h
+++ b/libunwindstack/ElfInterfaceArm.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_ELF_INTERFACE_ARM_H
-#define _LIBUNWINDSTACK_ELF_INTERFACE_ARM_H
+#pragma once
 
 #include <elf.h>
 #include <stdint.h>
@@ -94,5 +93,3 @@ class ElfInterfaceArm : public ElfInterface32 {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_ELF_INTERFACE_ARM_H
diff --git a/libunwindstack/GlobalDebugImpl.h b/libunwindstack/GlobalDebugImpl.h
index db8068d..dcea0ef 100644
--- a/libunwindstack/GlobalDebugImpl.h
+++ b/libunwindstack/GlobalDebugImpl.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_GLOBAL_DEBUG_IMPL_H
-#define _LIBUNWINDSTACK_GLOBAL_DEBUG_IMPL_H
+#pragma once
 
 #include <stdint.h>
 #include <string.h>
@@ -435,5 +434,3 @@ std::unique_ptr<GlobalDebugInterface<Symfile>> CreateGlobalDebugImpl(
 }
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_GLOBAL_DEBUG_IMPL_H
diff --git a/libunwindstack/MemoryBuffer.h b/libunwindstack/MemoryBuffer.h
index 24609f4..a5b5743 100644
--- a/libunwindstack/MemoryBuffer.h
+++ b/libunwindstack/MemoryBuffer.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_BUFFER_H
-#define _LIBUNWINDSTACK_MEMORY_BUFFER_H
+#pragma once
 
 #include <stdint.h>
 
@@ -56,5 +55,3 @@ class MemoryBuffer : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_BUFFER_H
diff --git a/libunwindstack/MemoryCache.h b/libunwindstack/MemoryCache.h
index 523a4a1..de5e9a0 100644
--- a/libunwindstack/MemoryCache.h
+++ b/libunwindstack/MemoryCache.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_CACHE_H
-#define _LIBUNWINDSTACK_MEMORY_CACHE_H
+#pragma once
 
 #include <pthread.h>
 #include <stdint.h>
@@ -91,5 +90,3 @@ class MemoryThreadCache : public MemoryCacheBase {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_CACHE_H
diff --git a/libunwindstack/MemoryFileAtOffset.h b/libunwindstack/MemoryFileAtOffset.h
index 9949f26..90cf00b 100644
--- a/libunwindstack/MemoryFileAtOffset.h
+++ b/libunwindstack/MemoryFileAtOffset.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_FILE_AT_OFFSET_H
-#define _LIBUNWINDSTACK_MEMORY_FILE_AT_OFFSET_H
+#pragma once
 
 #include <stdint.h>
 
@@ -45,5 +44,3 @@ class MemoryFileAtOffset : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_FILE_AT_OFFSET_H
diff --git a/libunwindstack/MemoryLocal.h b/libunwindstack/MemoryLocal.h
index a5c7a48..f98c9cb 100644
--- a/libunwindstack/MemoryLocal.h
+++ b/libunwindstack/MemoryLocal.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_LOCAL_H
-#define _LIBUNWINDSTACK_MEMORY_LOCAL_H
+#pragma once
 
 #include <stdint.h>
 
@@ -33,5 +32,3 @@ class MemoryLocal : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_LOCAL_H
diff --git a/libunwindstack/MemoryOffline.h b/libunwindstack/MemoryOffline.h
index 8a8e10f..024e111 100644
--- a/libunwindstack/MemoryOffline.h
+++ b/libunwindstack/MemoryOffline.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_OFFLINE_H
-#define _LIBUNWINDSTACK_MEMORY_OFFLINE_H
+#pragma once
 
 #include <stdint.h>
 
@@ -58,5 +57,3 @@ class MemoryOfflineParts : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_OFFLINE_H
diff --git a/libunwindstack/MemoryOfflineBuffer.h b/libunwindstack/MemoryOfflineBuffer.h
index 64c49a1..d77008e 100644
--- a/libunwindstack/MemoryOfflineBuffer.h
+++ b/libunwindstack/MemoryOfflineBuffer.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_OFFLINE_BUFFER_H
-#define _LIBUNWINDSTACK_MEMORY_OFFLINE_BUFFER_H
+#pragma once
 
 #include <stdint.h>
 
@@ -39,5 +38,3 @@ class MemoryOfflineBuffer : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_OFFLINE_BUFFER_H
diff --git a/libunwindstack/MemoryRange.h b/libunwindstack/MemoryRange.h
index ac0558b..b789ee3 100644
--- a/libunwindstack/MemoryRange.h
+++ b/libunwindstack/MemoryRange.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_RANGE_H
-#define _LIBUNWINDSTACK_MEMORY_RANGE_H
+#pragma once
 
 #include <stdint.h>
 
@@ -62,5 +61,3 @@ class MemoryRanges : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_RANGE_H
diff --git a/libunwindstack/MemoryRemote.h b/libunwindstack/MemoryRemote.h
index dd09c88..563e5b7 100644
--- a/libunwindstack/MemoryRemote.h
+++ b/libunwindstack/MemoryRemote.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_REMOTE_H
-#define _LIBUNWINDSTACK_MEMORY_REMOTE_H
+#pragma once
 
 #include <stdint.h>
 #include <sys/types.h>
@@ -42,5 +41,3 @@ class MemoryRemote : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_REMOTE_H
diff --git a/libunwindstack/MemoryXz.h b/libunwindstack/MemoryXz.h
index c72ba88..57bf6c5 100644
--- a/libunwindstack/MemoryXz.h
+++ b/libunwindstack/MemoryXz.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_XZ_H
-#define _LIBUNWINDSTACK_MEMORY_XZ_H
+#pragma once
 
 #include <atomic>
 #include <memory>
@@ -71,5 +70,3 @@ class MemoryXz : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_XZ_H
diff --git a/libunwindstack/RegsInfo.h b/libunwindstack/RegsInfo.h
index e445a91..28b297e 100644
--- a/libunwindstack/RegsInfo.h
+++ b/libunwindstack/RegsInfo.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_INFO_H
-#define _LIBUNWINDSTACK_REGS_INFO_H
+#pragma once
 
 #include <stdint.h>
 
@@ -64,5 +63,3 @@ struct RegsInfo {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_INFO_H
diff --git a/libunwindstack/Symbols.h b/libunwindstack/Symbols.h
index c1967b0..0b46751 100644
--- a/libunwindstack/Symbols.h
+++ b/libunwindstack/Symbols.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_SYMBOLS_H
-#define _LIBUNWINDSTACK_SYMBOLS_H
+#pragma once
 
 #include <stdint.h>
 
@@ -75,5 +74,3 @@ class Symbols {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_SYMBOLS_H
diff --git a/libunwindstack/ThreadEntry.h b/libunwindstack/ThreadEntry.h
index 1caba83..2f8e88d 100644
--- a/libunwindstack/ThreadEntry.h
+++ b/libunwindstack/ThreadEntry.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_THREAD_ENTRY_H
-#define _LIBUNWINDSTACK_THREAD_ENTRY_H
+#pragma once
 
 #include <pthread.h>
 #include <sys/types.h>
@@ -74,5 +73,3 @@ class ThreadEntry {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_THREAD_ENTRY_H
diff --git a/libunwindstack/benchmarks/MemoryLocalUnsafe.h b/libunwindstack/benchmarks/MemoryLocalUnsafe.h
index d901e1d..8edf473 100644
--- a/libunwindstack/benchmarks/MemoryLocalUnsafe.h
+++ b/libunwindstack/benchmarks/MemoryLocalUnsafe.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_BENCHMARKS_MEMORY_LOCAL_UNSAFE_H
-#define _LIBUNWINDSTACK_BENCHMARKS_MEMORY_LOCAL_UNSAFE_H
+#pragma once
 
 #include <cstddef>
 #include <cstring>
@@ -39,5 +38,3 @@ class MemoryLocalUnsafe : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_BENCHMARKS_MEMORY_LOCAL_UNSAFE_H
\ No newline at end of file
diff --git a/libunwindstack/benchmarks/Utils.h b/libunwindstack/benchmarks/Utils.h
index e916525..2d05af9 100644
--- a/libunwindstack/benchmarks/Utils.h
+++ b/libunwindstack/benchmarks/Utils.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UTILS_H
-#define _LIBUNWINDSTACK_UTILS_H
+#pragma once
 
 #include <benchmark/benchmark.h>
 #include <stdint.h>
@@ -66,5 +65,3 @@ class MemoryTracker {
   // total number of iterations of the ranged for loop across all runs of a single benchmark.
   size_t total_iterations_ = 0;
 };
-
-#endif  // _LIBUNWINDSTACK_UTILS_h
diff --git a/libunwindstack/include/GlobalDebugInterface.h b/libunwindstack/include/GlobalDebugInterface.h
index 45eec63..b1e9106 100644
--- a/libunwindstack/include/GlobalDebugInterface.h
+++ b/libunwindstack/include/GlobalDebugInterface.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_GLOBAL_DEBUG_INTERFACE_H
-#define _LIBUNWINDSTACK_GLOBAL_DEBUG_INTERFACE_H
+#pragma once
 
 #include <stdint.h>
 #include <memory>
@@ -41,5 +40,3 @@ class GlobalDebugInterface {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_GLOBAL_DEBUG_INTERFACE_H
diff --git a/libunwindstack/include/unwindstack/AndroidUnwinder.h b/libunwindstack/include/unwindstack/AndroidUnwinder.h
index 3f82429..de5579d 100644
--- a/libunwindstack/include/unwindstack/AndroidUnwinder.h
+++ b/libunwindstack/include/unwindstack/AndroidUnwinder.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_ANDROID_UNWINDER_H
-#define _LIBUNWINDSTACK_ANDROID_UNWINDER_H
+#pragma once
 
 #include <stdint.h>
 #include <sys/types.h>
@@ -160,5 +159,3 @@ class AndroidRemoteUnwinder : public AndroidUnwinder {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_ANDROID_UNWINDER_H
diff --git a/libunwindstack/include/unwindstack/Arch.h b/libunwindstack/include/unwindstack/Arch.h
index 7060004..42180b4 100644
--- a/libunwindstack/include/unwindstack/Arch.h
+++ b/libunwindstack/include/unwindstack/Arch.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_ARCH_H
-#define _LIBUNWINDSTACK_ARCH_H
+#pragma once
 
 #include <stddef.h>
 
@@ -43,5 +42,3 @@ static inline bool ArchIs32Bit(ArchEnum arch) {
 }
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_ARCH_H
diff --git a/libunwindstack/include/unwindstack/DexFiles.h b/libunwindstack/include/unwindstack/DexFiles.h
index 2a1b770..101d772 100644
--- a/libunwindstack/include/unwindstack/DexFiles.h
+++ b/libunwindstack/include/unwindstack/DexFiles.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DEX_FILES_H
-#define _LIBUNWINDSTACK_DEX_FILES_H
+#pragma once
 
 #include <stdint.h>
 
@@ -36,5 +35,3 @@ std::unique_ptr<DexFiles> CreateDexFiles(ArchEnum arch, std::shared_ptr<Memory>&
                                          std::vector<std::string> search_libs = {});
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DEX_FILES_H
diff --git a/libunwindstack/include/unwindstack/DwarfError.h b/libunwindstack/include/unwindstack/DwarfError.h
index 763e2cb..6143523 100644
--- a/libunwindstack/include/unwindstack/DwarfError.h
+++ b/libunwindstack/include/unwindstack/DwarfError.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_ERROR_H
-#define _LIBUNWINDSTACK_DWARF_ERROR_H
+#pragma once
 
 #include <stdint.h>
 
@@ -40,5 +39,3 @@ struct DwarfErrorData {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_ERROR_H
diff --git a/libunwindstack/include/unwindstack/DwarfLocation.h b/libunwindstack/include/unwindstack/DwarfLocation.h
index 22ed47a..9726f15 100644
--- a/libunwindstack/include/unwindstack/DwarfLocation.h
+++ b/libunwindstack/include/unwindstack/DwarfLocation.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_LOCATION_H
-#define _LIBUNWINDSTACK_DWARF_LOCATION_H
+#pragma once
 
 #include <stdint.h>
 
@@ -49,5 +48,3 @@ struct DwarfLocations : public std::unordered_map<uint32_t, DwarfLocation> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_LOCATION_H
diff --git a/libunwindstack/include/unwindstack/DwarfMemory.h b/libunwindstack/include/unwindstack/DwarfMemory.h
index c45699a..2ef3b30 100644
--- a/libunwindstack/include/unwindstack/DwarfMemory.h
+++ b/libunwindstack/include/unwindstack/DwarfMemory.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_MEMORY_H
-#define _LIBUNWINDSTACK_DWARF_MEMORY_H
+#pragma once
 
 #include <stdint.h>
 
@@ -72,5 +71,3 @@ class DwarfMemory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_MEMORY_H
diff --git a/libunwindstack/include/unwindstack/DwarfSection.h b/libunwindstack/include/unwindstack/DwarfSection.h
index 71ca62e..33435b2 100644
--- a/libunwindstack/include/unwindstack/DwarfSection.h
+++ b/libunwindstack/include/unwindstack/DwarfSection.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_SECTION_H
-#define _LIBUNWINDSTACK_DWARF_SECTION_H
+#pragma once
 
 #include <stdint.h>
 
@@ -179,5 +178,3 @@ class DwarfSectionImpl : public DwarfSection {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_SECTION_H
diff --git a/libunwindstack/include/unwindstack/DwarfStructs.h b/libunwindstack/include/unwindstack/DwarfStructs.h
index 3d8c2db..4c05360 100644
--- a/libunwindstack/include/unwindstack/DwarfStructs.h
+++ b/libunwindstack/include/unwindstack/DwarfStructs.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DWARF_STRUCTS_H
-#define _LIBUNWINDSTACK_DWARF_STRUCTS_H
+#pragma once
 
 #include <stdint.h>
 
@@ -51,5 +50,3 @@ struct DwarfFde {
 constexpr uint16_t CFA_REG = static_cast<uint16_t>(-1);
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DWARF_STRUCTS_H
diff --git a/libunwindstack/include/unwindstack/Elf.h b/libunwindstack/include/unwindstack/Elf.h
index 73ffda9..0985042 100644
--- a/libunwindstack/include/unwindstack/Elf.h
+++ b/libunwindstack/include/unwindstack/Elf.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_ELF_H
-#define _LIBUNWINDSTACK_ELF_H
+#pragma once
 
 #include <stddef.h>
 
@@ -138,5 +137,3 @@ class Elf {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_ELF_H
diff --git a/libunwindstack/include/unwindstack/ElfInterface.h b/libunwindstack/include/unwindstack/ElfInterface.h
index 23b7256..a192450 100644
--- a/libunwindstack/include/unwindstack/ElfInterface.h
+++ b/libunwindstack/include/unwindstack/ElfInterface.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_ELF_INTERFACE_H
-#define _LIBUNWINDSTACK_ELF_INTERFACE_H
+#pragma once
 
 #include <elf.h>
 #include <stdint.h>
@@ -225,5 +224,3 @@ using ElfInterface32 = ElfInterfaceImpl<ElfTypes32>;
 using ElfInterface64 = ElfInterfaceImpl<ElfTypes64>;
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_ELF_INTERFACE_H
diff --git a/libunwindstack/include/unwindstack/Error.h b/libunwindstack/include/unwindstack/Error.h
index abd59ad..3a3c646 100644
--- a/libunwindstack/include/unwindstack/Error.h
+++ b/libunwindstack/include/unwindstack/Error.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_ERROR_H
-#define _LIBUNWINDSTACK_ERROR_H
+#pragma once
 
 #include <stdint.h>
 
@@ -87,5 +86,3 @@ struct ErrorData {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_ERROR_H
diff --git a/libunwindstack/include/unwindstack/Global.h b/libunwindstack/include/unwindstack/Global.h
index b790832..d12ecb1 100644
--- a/libunwindstack/include/unwindstack/Global.h
+++ b/libunwindstack/include/unwindstack/Global.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_GLOBAL_H
-#define _LIBUNWINDSTACK_GLOBAL_H
+#pragma once
 
 #include <stdint.h>
 
@@ -59,5 +58,3 @@ class Global {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_GLOBAL_H
diff --git a/libunwindstack/include/unwindstack/JitDebug.h b/libunwindstack/include/unwindstack/JitDebug.h
index cfa8f7e..8653f94 100644
--- a/libunwindstack/include/unwindstack/JitDebug.h
+++ b/libunwindstack/include/unwindstack/JitDebug.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_JIT_DEBUG_H
-#define _LIBUNWINDSTACK_JIT_DEBUG_H
+#pragma once
 
 #include <stdint.h>
 
@@ -36,5 +35,3 @@ std::unique_ptr<JitDebug> CreateJitDebug(ArchEnum arch, std::shared_ptr<Memory>&
                                          std::vector<std::string> search_libs = {});
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_JIT_DEBUG_H
diff --git a/libunwindstack/include/unwindstack/Log.h b/libunwindstack/include/unwindstack/Log.h
index 56de7e0..34eb218 100644
--- a/libunwindstack/include/unwindstack/Log.h
+++ b/libunwindstack/include/unwindstack/Log.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_LOG_H
-#define _LIBUNWINDSTACK_LOG_H
+#pragma once
 
 #include <stdarg.h>
 #include <stdint.h>
@@ -36,5 +35,3 @@ void AsyncSafe(const char* format, ...) __printflike(1, 2);
 }  // namespace Log
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_LOG_H
diff --git a/libunwindstack/include/unwindstack/MachineArm.h b/libunwindstack/include/unwindstack/MachineArm.h
index 3f902b1..6b8198e 100644
--- a/libunwindstack/include/unwindstack/MachineArm.h
+++ b/libunwindstack/include/unwindstack/MachineArm.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MACHINE_ARM_H
-#define _LIBUNWINDSTACK_MACHINE_ARM_H
+#pragma once
 
 #include <stdint.h>
 
@@ -46,5 +45,3 @@ enum ArmReg : uint16_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MACHINE_ARM_H
diff --git a/libunwindstack/include/unwindstack/MachineArm64.h b/libunwindstack/include/unwindstack/MachineArm64.h
index 358e3d9..f1b7c1d 100644
--- a/libunwindstack/include/unwindstack/MachineArm64.h
+++ b/libunwindstack/include/unwindstack/MachineArm64.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MACHINE_ARM64_H
-#define _LIBUNWINDSTACK_MACHINE_ARM64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -70,5 +69,3 @@ enum Arm64Reg : uint16_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MACHINE_ARM64_H
diff --git a/libunwindstack/include/unwindstack/MachineMips.h b/libunwindstack/include/unwindstack/MachineMips.h
index 2dfb1e9..6a96536 100644
--- a/libunwindstack/include/unwindstack/MachineMips.h
+++ b/libunwindstack/include/unwindstack/MachineMips.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MACHINE_MIPS_H
-#define _LIBUNWINDSTACK_MACHINE_MIPS_H
+#pragma once
 
 #include <stdint.h>
 
@@ -62,5 +61,3 @@ enum MipsReg : uint16_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MACHINE_MIPS_H
\ No newline at end of file
diff --git a/libunwindstack/include/unwindstack/MachineMips64.h b/libunwindstack/include/unwindstack/MachineMips64.h
index 34addf2..e148efc 100644
--- a/libunwindstack/include/unwindstack/MachineMips64.h
+++ b/libunwindstack/include/unwindstack/MachineMips64.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MACHINE_MIPS64_H
-#define _LIBUNWINDSTACK_MACHINE_MIPS64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -62,5 +61,3 @@ enum Mips64Reg : uint16_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MACHINE_MIPS64_H
\ No newline at end of file
diff --git a/libunwindstack/include/unwindstack/MachineX86.h b/libunwindstack/include/unwindstack/MachineX86.h
index 02adb98..ff4fd4b 100644
--- a/libunwindstack/include/unwindstack/MachineX86.h
+++ b/libunwindstack/include/unwindstack/MachineX86.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MACHINE_X86_H
-#define _LIBUNWINDSTACK_MACHINE_X86_H
+#pragma once
 
 #include <stdint.h>
 
@@ -47,5 +46,3 @@ enum X86Reg : uint16_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MACHINE_X86_H
diff --git a/libunwindstack/include/unwindstack/MachineX86_64.h b/libunwindstack/include/unwindstack/MachineX86_64.h
index af33fea..66670e3 100644
--- a/libunwindstack/include/unwindstack/MachineX86_64.h
+++ b/libunwindstack/include/unwindstack/MachineX86_64.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MACHINE_X86_64_H
-#define _LIBUNWINDSTACK_MACHINE_X86_64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -48,5 +47,3 @@ enum X86_64Reg : uint16_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MACHINE_X86_64_H
diff --git a/libunwindstack/include/unwindstack/MapInfo.h b/libunwindstack/include/unwindstack/MapInfo.h
index ce4dbea..12711f5 100644
--- a/libunwindstack/include/unwindstack/MapInfo.h
+++ b/libunwindstack/include/unwindstack/MapInfo.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MAP_INFO_H
-#define _LIBUNWINDSTACK_MAP_INFO_H
+#pragma once
 
 #include <stdint.h>
 
@@ -232,5 +231,3 @@ class MapInfo {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MAP_INFO_H
diff --git a/libunwindstack/include/unwindstack/Maps.h b/libunwindstack/include/unwindstack/Maps.h
index deaca6f..d9e1383 100644
--- a/libunwindstack/include/unwindstack/Maps.h
+++ b/libunwindstack/include/unwindstack/Maps.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MAPS_H
-#define _LIBUNWINDSTACK_MAPS_H
+#pragma once
 
 #include <pthread.h>
 #include <sys/types.h>
@@ -138,5 +137,3 @@ class FileMaps : public Maps {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MAPS_H
diff --git a/libunwindstack/include/unwindstack/Memory.h b/libunwindstack/include/unwindstack/Memory.h
index b7bede6..d6ca29e 100644
--- a/libunwindstack/include/unwindstack/Memory.h
+++ b/libunwindstack/include/unwindstack/Memory.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_MEMORY_H
-#define _LIBUNWINDSTACK_MEMORY_H
+#pragma once
 
 #include <stdint.h>
 #include <sys/types.h>
@@ -65,5 +64,3 @@ class Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_MEMORY_H
diff --git a/libunwindstack/include/unwindstack/Regs.h b/libunwindstack/include/unwindstack/Regs.h
index 1f01f92..e49370d 100644
--- a/libunwindstack/include/unwindstack/Regs.h
+++ b/libunwindstack/include/unwindstack/Regs.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_H
-#define _LIBUNWINDSTACK_REGS_H
+#pragma once
 
 #include <stdint.h>
 #include <unistd.h>
@@ -117,5 +116,3 @@ class RegsImpl : public Regs {
 uint64_t GetPcAdjustment(uint64_t rel_pc, Elf* elf, ArchEnum arch);
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_H
diff --git a/libunwindstack/include/unwindstack/RegsArm.h b/libunwindstack/include/unwindstack/RegsArm.h
index fbb34e7..5596605 100644
--- a/libunwindstack/include/unwindstack/RegsArm.h
+++ b/libunwindstack/include/unwindstack/RegsArm.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_ARM_H
-#define _LIBUNWINDSTACK_REGS_ARM_H
+#pragma once
 
 #include <stdint.h>
 
@@ -56,5 +55,3 @@ class RegsArm : public RegsImpl<uint32_t> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_ARM_H
diff --git a/libunwindstack/include/unwindstack/RegsArm64.h b/libunwindstack/include/unwindstack/RegsArm64.h
index 508366e..d12a043 100644
--- a/libunwindstack/include/unwindstack/RegsArm64.h
+++ b/libunwindstack/include/unwindstack/RegsArm64.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_ARM64_H
-#define _LIBUNWINDSTACK_REGS_ARM64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -73,5 +72,3 @@ class RegsArm64 : public RegsImpl<uint64_t> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_ARM64_H
diff --git a/libunwindstack/include/unwindstack/RegsGetLocal.h b/libunwindstack/include/unwindstack/RegsGetLocal.h
index ac171b9..bf3f767 100644
--- a/libunwindstack/include/unwindstack/RegsGetLocal.h
+++ b/libunwindstack/include/unwindstack/RegsGetLocal.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_GET_LOCAL_H
-#define _LIBUNWINDSTACK_REGS_GET_LOCAL_H
+#pragma once
 
 namespace unwindstack {
 
@@ -91,7 +90,4 @@ inline __attribute__((__always_inline__)) void RegsGetLocal(Regs* regs) {
   AsmGetRegs(regs->RawData());
 }
 
-
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_GET_LOCAL_H
diff --git a/libunwindstack/include/unwindstack/RegsMips.h b/libunwindstack/include/unwindstack/RegsMips.h
index dc09b83..61e4dbf 100644
--- a/libunwindstack/include/unwindstack/RegsMips.h
+++ b/libunwindstack/include/unwindstack/RegsMips.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_MIPS_H
-#define _LIBUNWINDSTACK_REGS_MIPS_H
+#pragma once
 
 #include <stdint.h>
 
@@ -56,5 +55,3 @@ class RegsMips : public RegsImpl<uint32_t> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_MIPS_H
diff --git a/libunwindstack/include/unwindstack/RegsMips64.h b/libunwindstack/include/unwindstack/RegsMips64.h
index 64a80dc..012a8f0 100644
--- a/libunwindstack/include/unwindstack/RegsMips64.h
+++ b/libunwindstack/include/unwindstack/RegsMips64.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_MIPS64_H
-#define _LIBUNWINDSTACK_REGS_MIPS64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -56,5 +55,3 @@ class RegsMips64 : public RegsImpl<uint64_t> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_MIPS64_H
diff --git a/libunwindstack/include/unwindstack/RegsX86.h b/libunwindstack/include/unwindstack/RegsX86.h
index cfbdda6..d8245ee 100644
--- a/libunwindstack/include/unwindstack/RegsX86.h
+++ b/libunwindstack/include/unwindstack/RegsX86.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_X86_H
-#define _LIBUNWINDSTACK_REGS_X86_H
+#pragma once
 
 #include <stdint.h>
 
@@ -59,5 +58,3 @@ class RegsX86 : public RegsImpl<uint32_t> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_X86_H
diff --git a/libunwindstack/include/unwindstack/RegsX86_64.h b/libunwindstack/include/unwindstack/RegsX86_64.h
index a11aef0..90fee93 100644
--- a/libunwindstack/include/unwindstack/RegsX86_64.h
+++ b/libunwindstack/include/unwindstack/RegsX86_64.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_REGS_X86_64_H
-#define _LIBUNWINDSTACK_REGS_X86_64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -59,5 +58,3 @@ class RegsX86_64 : public RegsImpl<uint64_t> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_REGS_X86_64_H
diff --git a/libunwindstack/include/unwindstack/SharedString.h b/libunwindstack/include/unwindstack/SharedString.h
index a82c4fe..1eb4e21 100644
--- a/libunwindstack/include/unwindstack/SharedString.h
+++ b/libunwindstack/include/unwindstack/SharedString.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_SHAREDSTRING_H
-#define _LIBUNWINDSTACK_SHAREDSTRING_H
+#pragma once
 
 #include <memory>
 #include <string>
@@ -73,4 +72,3 @@ static inline std::string operator+(const char* a, const SharedString& b) {
 }
 
 }  // namespace unwindstack
-#endif  // _LIBUNWINDSTACK_SHAREDSTRING_H
diff --git a/libunwindstack/include/unwindstack/UcontextArm.h b/libunwindstack/include/unwindstack/UcontextArm.h
index 7d1ec3b..0d7f90d 100644
--- a/libunwindstack/include/unwindstack/UcontextArm.h
+++ b/libunwindstack/include/unwindstack/UcontextArm.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_UCONTEXT_ARM_H
-#define _LIBUNWINDSTACK_UCONTEXT_ARM_H
+#pragma once
 
 #include <stdint.h>
 
@@ -59,5 +58,3 @@ struct arm_ucontext_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UCONTEXT_ARM_H
diff --git a/libunwindstack/include/unwindstack/UcontextArm64.h b/libunwindstack/include/unwindstack/UcontextArm64.h
index a68be3b..49278b3 100644
--- a/libunwindstack/include/unwindstack/UcontextArm64.h
+++ b/libunwindstack/include/unwindstack/UcontextArm64.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_UCONTEXT_ARM64_H
-#define _LIBUNWINDSTACK_UCONTEXT_ARM64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -65,5 +64,3 @@ struct arm64_ucontext_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UCONTEXT_ARM64_H
diff --git a/libunwindstack/include/unwindstack/UcontextMips.h b/libunwindstack/include/unwindstack/UcontextMips.h
index 02e33b6..c75e469 100644
--- a/libunwindstack/include/unwindstack/UcontextMips.h
+++ b/libunwindstack/include/unwindstack/UcontextMips.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_UCONTEXT_MIPS_H
-#define _LIBUNWINDSTACK_UCONTEXT_MIPS_H
+#pragma once
 
 #include <stdint.h>
 
@@ -58,5 +57,3 @@ struct mips_ucontext_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UCONTEXT_MIPS_H
diff --git a/libunwindstack/include/unwindstack/UcontextMips64.h b/libunwindstack/include/unwindstack/UcontextMips64.h
index 5b92a55..c63218f 100644
--- a/libunwindstack/include/unwindstack/UcontextMips64.h
+++ b/libunwindstack/include/unwindstack/UcontextMips64.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_UCONTEXT_MIPS64_H
-#define _LIBUNWINDSTACK_UCONTEXT_MIPS64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -65,5 +64,3 @@ struct mips64_ucontext_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UCONTEXT_MIPS64_H
diff --git a/libunwindstack/include/unwindstack/UcontextX86.h b/libunwindstack/include/unwindstack/UcontextX86.h
index c96ebb7..9dfdf2a 100644
--- a/libunwindstack/include/unwindstack/UcontextX86.h
+++ b/libunwindstack/include/unwindstack/UcontextX86.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_UCONTEXT_X86_H
-#define _LIBUNWINDSTACK_UCONTEXT_X86_H
+#pragma once
 
 #include <stdint.h>
 
@@ -73,5 +72,3 @@ struct x86_ucontext_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UCONTEXT_X86_H
diff --git a/libunwindstack/include/unwindstack/UcontextX86_64.h b/libunwindstack/include/unwindstack/UcontextX86_64.h
index 4e163e5..2801217 100644
--- a/libunwindstack/include/unwindstack/UcontextX86_64.h
+++ b/libunwindstack/include/unwindstack/UcontextX86_64.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_UCONTEXT_X86_64_H
-#define _LIBUNWINDSTACK_UCONTEXT_X86_64_H
+#pragma once
 
 #include <stdint.h>
 
@@ -78,5 +77,3 @@ struct x86_64_ucontext_t {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UCONTEXT_X86_64_H
diff --git a/libunwindstack/include/unwindstack/Unwinder.h b/libunwindstack/include/unwindstack/Unwinder.h
index 462d39b..d78da5c 100644
--- a/libunwindstack/include/unwindstack/Unwinder.h
+++ b/libunwindstack/include/unwindstack/Unwinder.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UNWINDER_H
-#define _LIBUNWINDSTACK_UNWINDER_H
+#pragma once
 
 #include <stdint.h>
 #include <sys/types.h>
@@ -197,5 +196,3 @@ class ThreadUnwinder : public UnwinderFromPid {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UNWINDER_H
diff --git a/libunwindstack/include/unwindstack/UserArm.h b/libunwindstack/include/unwindstack/UserArm.h
index 7388c03..725a35b 100644
--- a/libunwindstack/include/unwindstack/UserArm.h
+++ b/libunwindstack/include/unwindstack/UserArm.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_USER_ARM_H
-#define _LIBUNWINDSTACK_USER_ARM_H
+#pragma once
 
 namespace unwindstack {
 
@@ -36,5 +35,3 @@ struct arm_user_regs {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_USER_ARM_H
diff --git a/libunwindstack/include/unwindstack/UserArm64.h b/libunwindstack/include/unwindstack/UserArm64.h
index d74983f..0e16cd6 100644
--- a/libunwindstack/include/unwindstack/UserArm64.h
+++ b/libunwindstack/include/unwindstack/UserArm64.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_USER_ARM64_H
-#define _LIBUNWINDSTACK_USER_ARM64_H
+#pragma once
 
 namespace unwindstack {
 
@@ -39,5 +38,3 @@ struct arm64_user_regs {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_USER_ARM64_H
diff --git a/libunwindstack/include/unwindstack/UserMips.h b/libunwindstack/include/unwindstack/UserMips.h
index 184be4f..148ef93 100644
--- a/libunwindstack/include/unwindstack/UserMips.h
+++ b/libunwindstack/include/unwindstack/UserMips.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_USER_MIPS_H
-#define _LIBUNWINDSTACK_USER_MIPS_H
+#pragma once
 
 namespace unwindstack {
 
@@ -41,5 +40,3 @@ struct mips_user_regs {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_USER_MIPS_H
diff --git a/libunwindstack/include/unwindstack/UserMips64.h b/libunwindstack/include/unwindstack/UserMips64.h
index c46befd..9844307 100644
--- a/libunwindstack/include/unwindstack/UserMips64.h
+++ b/libunwindstack/include/unwindstack/UserMips64.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_USER_MIPS64_H
-#define _LIBUNWINDSTACK_USER_MIPS64_H
+#pragma once
 
 namespace unwindstack {
 
@@ -41,5 +40,3 @@ struct mips64_user_regs {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_USER_MIPS64_H
diff --git a/libunwindstack/include/unwindstack/UserX86.h b/libunwindstack/include/unwindstack/UserX86.h
index a040560..9508010 100644
--- a/libunwindstack/include/unwindstack/UserX86.h
+++ b/libunwindstack/include/unwindstack/UserX86.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_USER_X86_H
-#define _LIBUNWINDSTACK_USER_X86_H
+#pragma once
 
 namespace unwindstack {
 
@@ -52,5 +51,3 @@ struct x86_user_regs {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_USER_X86_H
diff --git a/libunwindstack/include/unwindstack/UserX86_64.h b/libunwindstack/include/unwindstack/UserX86_64.h
index b80d201..d7ff2e2 100644
--- a/libunwindstack/include/unwindstack/UserX86_64.h
+++ b/libunwindstack/include/unwindstack/UserX86_64.h
@@ -26,8 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _LIBUNWINDSTACK_USER_X86_64_H
-#define _LIBUNWINDSTACK_USER_X86_64_H
+#pragma once
 
 namespace unwindstack {
 
@@ -62,5 +61,3 @@ struct x86_64_user_regs {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_USER_X86_64_H
diff --git a/libunwindstack/tests/DexFileData.h b/libunwindstack/tests/DexFileData.h
index 6975c68..d4408d9 100644
--- a/libunwindstack/tests/DexFileData.h
+++ b/libunwindstack/tests/DexFileData.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_DEXFILESDATA_H
-#define _LIBUNWINDSTACK_DEXFILESDATA_H
+#pragma once
 
 namespace unwindstack {
 
@@ -41,5 +40,3 @@ static constexpr uint32_t kDexData[] = {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_DEXFILESDATA_H
diff --git a/libunwindstack/tests/ElfFake.h b/libunwindstack/tests/ElfFake.h
index 8c5b9ef..97d6dcc 100644
--- a/libunwindstack/tests/ElfFake.h
+++ b/libunwindstack/tests/ElfFake.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_TESTS_ELF_FAKE_H
-#define _LIBUNWINDSTACK_TESTS_ELF_FAKE_H
+#pragma once
 
 #include <stdint.h>
 
@@ -152,5 +151,3 @@ class ElfInterfaceArmFake : public ElfInterfaceArm {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_TESTS_ELF_FAKE_H
diff --git a/libunwindstack/tests/ElfTestUtils.h b/libunwindstack/tests/ElfTestUtils.h
index 62cd59a..25f0052 100644
--- a/libunwindstack/tests/ElfTestUtils.h
+++ b/libunwindstack/tests/ElfTestUtils.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_TESTS_ELF_TEST_UTILS_H
-#define _LIBUNWINDSTACK_TESTS_ELF_TEST_UTILS_H
+#pragma once
 
 #include <functional>
 #include <string>
@@ -34,5 +33,3 @@ void TestInitGnuDebugdata(uint32_t elf_class, uint32_t machine_type, bool init_g
 std::string TestGetFileDirectory();
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_TESTS_ELF_TEST_UTILS_H
diff --git a/libunwindstack/tests/LogFake.h b/libunwindstack/tests/LogFake.h
index e1dc50d..11f47b1 100644
--- a/libunwindstack/tests/LogFake.h
+++ b/libunwindstack/tests/LogFake.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_TESTS_LOG_FAKE_H
-#define _LIBUNWINDSTACK_TESTS_LOG_FAKE_H
+#pragma once
 
 #include <string>
 
@@ -26,5 +25,3 @@ std::string GetFakeLogBuf();
 std::string GetFakeLogPrint();
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_TESTS_LOG_FAKE_H
diff --git a/libunwindstack/tests/TestUtils.h b/libunwindstack/tests/TestUtils.h
index 2378fd5..19cd693 100644
--- a/libunwindstack/tests/TestUtils.h
+++ b/libunwindstack/tests/TestUtils.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_TESTS_TEST_UTILS_H
-#define _LIBUNWINDSTACK_TESTS_TEST_UTILS_H
+#pragma once
 
 #include <signal.h>
 #include <stdint.h>
@@ -48,5 +47,3 @@ static inline void DoNotOptimize(Tp const& value) {
 }
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_TESTS_TEST_UTILS_H
diff --git a/libunwindstack/tests/fuzz/UnwinderComponentCreator.h b/libunwindstack/tests/fuzz/UnwinderComponentCreator.h
index 392219f..8486418 100644
--- a/libunwindstack/tests/fuzz/UnwinderComponentCreator.h
+++ b/libunwindstack/tests/fuzz/UnwinderComponentCreator.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UNWINDERCOMPONENTCREATOR_H
-#define _LIBUNWINDSTACK_UNWINDERCOMPONENTCREATOR_H
+#pragma once
 
 #include <elf.h>
 #include <sys/mman.h>
@@ -81,4 +80,3 @@ std::unique_ptr<unwindstack::DexFiles> GetDexFiles(FuzzedDataProvider* data_prov
                                                    std::shared_ptr<unwindstack::Memory> memory,
                                                    uint max_libraries, uint max_library_length,
                                                    unwindstack::ArchEnum arch);
-#endif  // _LIBUNWINDSTACK_UNWINDERCOMPONENTCREATOR_H
diff --git a/libunwindstack/utils/DwarfSectionImplFake.h b/libunwindstack/utils/DwarfSectionImplFake.h
index 973e535..54ed995 100644
--- a/libunwindstack/utils/DwarfSectionImplFake.h
+++ b/libunwindstack/utils/DwarfSectionImplFake.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UTILS_DWARF_SECTION_IMPL_FAKE_H
-#define _LIBUNWINDSTACK_UTILS_DWARF_SECTION_IMPL_FAKE_H
+#pragma once
 
 #include <unwindstack/DwarfSection.h>
 #include <unwindstack/Memory.h>
@@ -47,5 +46,3 @@ class DwarfSectionImplFake : public DwarfSectionImpl<TypeParam> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UTILS_DWARF_SECTION_IMPL_FAKE_H
\ No newline at end of file
diff --git a/libunwindstack/utils/MemoryFake.h b/libunwindstack/utils/MemoryFake.h
index 012fe90..b7adfd9 100644
--- a/libunwindstack/utils/MemoryFake.h
+++ b/libunwindstack/utils/MemoryFake.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UTILS_MEMORY_FAKE_H
-#define _LIBUNWINDSTACK_UTILS_MEMORY_FAKE_H
+#pragma once
 
 #include <stdint.h>
 
@@ -72,5 +71,3 @@ class MemoryFakeAlwaysReadZero : public Memory {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UTILS_MEMORY_FAKE_H
diff --git a/libunwindstack/utils/OfflineUnwindUtils.h b/libunwindstack/utils/OfflineUnwindUtils.h
index fc55d0c..df89c68 100644
--- a/libunwindstack/utils/OfflineUnwindUtils.h
+++ b/libunwindstack/utils/OfflineUnwindUtils.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UTILS_OFFLINE_UNWIND_UTILS_H
-#define _LIBUNWINDSTACK_UTILS_OFFLINE_UNWIND_UTILS_H
+#pragma once
 
 #include <cstddef>
 #include <filesystem>
@@ -187,5 +186,3 @@ class OfflineUnwindUtils {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UTILS_OFFLINE_UNWIND_UTILS_H
diff --git a/libunwindstack/utils/PidUtils.h b/libunwindstack/utils/PidUtils.h
index 5dbd4ae..5f67204 100644
--- a/libunwindstack/utils/PidUtils.h
+++ b/libunwindstack/utils/PidUtils.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UTILS_PID_UTILS_H
-#define _LIBUNWINDSTACK_UTILS_PID_UTILS_H
+#pragma once
 
 #include <stdint.h>
 #include <sys/types.h>
@@ -39,5 +38,3 @@ bool Detach(pid_t pid);
 bool RunWhenQuiesced(pid_t pid, bool leave_attached, std::function<PidRunEnum()> fn);
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UTILS_PID_UTILS_H
diff --git a/libunwindstack/utils/ProcessTracer.h b/libunwindstack/utils/ProcessTracer.h
index cd5fe80..1809cb2 100644
--- a/libunwindstack/utils/ProcessTracer.h
+++ b/libunwindstack/utils/ProcessTracer.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UTILS_PROCESS_TRACER_H
-#define _LIBUNWINDSTACK_UTILS_PROCESS_TRACER_H
+#pragma once
 
 #include <sys/types.h>
 
@@ -87,5 +86,3 @@ class ProcessTracer final {
   pid_t cur_attached_tid_ = kNoThreadAttached;
 };
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UTILS_PROCESS_TRACER_H
\ No newline at end of file
diff --git a/libunwindstack/utils/RegsFake.h b/libunwindstack/utils/RegsFake.h
index c0b35b7..4bb4181 100644
--- a/libunwindstack/utils/RegsFake.h
+++ b/libunwindstack/utils/RegsFake.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBUNWINDSTACK_UTILS_REGS_FAKE_H
-#define _LIBUNWINDSTACK_UTILS_REGS_FAKE_H
+#pragma once
 
 #include <stdint.h>
 
@@ -113,5 +112,3 @@ class RegsImplFake : public RegsImpl<TypeParam> {
 };
 
 }  // namespace unwindstack
-
-#endif  // _LIBUNWINDSTACK_UTILS_REGS_FAKE_H