[llvm-readobj][COFF] Add support for more CET and hotpatch flags

Split out the COFF dumper from issue llvm#150761.

- Decreased the size of existing `has-cet.exe`.
- Added `IMAGE_DLL_CHARACTERISTICS_EX_CET_COMPAT_STRICT_MODE`
- Added `IMAGE_DLL_CHARACTERISTICS_EX_CET_SET_CONTEXT_IP_VALIDATION_RELAXED_MODE`
- Added `IMAGE_DLL_CHARACTERISTICS_EX_CET_DYNAMIC_APIS_ALLOW_IN_PROC_ONLY`
- Added `IMAGE_DLL_CHARACTERISTICS_EX_CET_RESERVED_1`
- Added `IMAGE_DLL_CHARACTERISTICS_EX_CET_RESERVED_2`
- Added `IMAGE_DLL_CHARACTERISTICS_EX_FORWARD_CFI_COMPAT`
- Added `IMAGE_DLL_CHARACTERISTICS_EX_HOTPATCH_COMPATIBLE`

Author: kkent030315

llvm/include/llvm/BinaryFormat/COFF.h

@@ -694,7 +694,24 @@ enum DLLCharacteristics : unsigned {
 
 enum ExtendedDLLCharacteristics : unsigned {
   /// Image is CET compatible
-  IMAGE_DLL_CHARACTERISTICS_EX_CET_COMPAT = 0x0001
+  IMAGE_DLL_CHARACTERISTICS_EX_CET_COMPAT = 0x0001,
+  /// Image is CET compatible in strict mode
+  IMAGE_DLL_CHARACTERISTICS_EX_CET_COMPAT_STRICT_MODE = 0x0002,
+  /// Image is CET compatible in such a way that context IP validation is
+  /// relaxed
+  IMAGE_DLL_CHARACTERISTICS_EX_CET_SET_CONTEXT_IP_VALIDATION_RELAXED_MODE =
+      0x0004,
+  /// Image is CET compatible in such a way that the use of
+  /// dynamic APIs is restricted to processes only
+  IMAGE_DLL_CHARACTERISTICS_EX_CET_DYNAMIC_APIS_ALLOW_IN_PROC_ONLY = 0x0008,
+  /// Reserved for future use. Not used by MSVC link.exe
+  IMAGE_DLL_CHARACTERISTICS_EX_CET_RESERVED_1 = 0x0010,
+  /// Reserved for future use. Not used by MSVC link.exe
+  IMAGE_DLL_CHARACTERISTICS_EX_CET_RESERVED_2 = 0x0020,
+  /// Image is CFI compatible.
+  IMAGE_DLL_CHARACTERISTICS_EX_FORWARD_CFI_COMPAT = 0x0040,
+  /// Image is hotpatch compatible.
+  IMAGE_DLL_CHARACTERISTICS_EX_HOTPATCH_COMPATIBLE = 0x0080,
 };
 
 enum DebugType : unsigned {

llvm/test/tools/llvm-readobj/COFF/Inputs/has-cet.exe

@@ -0,0 +1,16 @@
+# To regenerate has-cetstrict.exe
+# $ echo int main() { return 0; } > has-cetstrict.c
+# $ cl has-cetstruct.c /link /cetcompatstrict
+RUN: llvm-readobj --coff-debug-directory %p/Inputs/has-cetstrict.exe | FileCheck %s
+
+CHECK:  DebugEntry {
+CHECK:    Characteristics: 0x0
+CHECK:    Type: ExtendedDLLCharacteristics (0x14)
+CHECK:    ExtendedCharacteristics [ (0x2)
+CHECK:      IMAGE_DLL_CHARACTERISTICS_EX_CET_COMPAT_STRICT_MODE (0x2)
+CHECK:    ]
+CHECK:    RawData (
+CHECK:      0000: 02000000                             |....|
+CHECK:    )
+CHECK:  }
+

llvm/test/tools/llvm-readobj/COFF/Inputs/has-cetdynamicapisinproc.exe

@@ -0,0 +1,16 @@
+# To regenerate has-cetdynamicapisinproc.exe
+# $ echo int main() { return 0; } > has-cetdynamicapisinproc.c
+# $ cl has-cetdynamicapisinproc.c /link /cetdynamicapisinproc
+RUN: llvm-readobj --coff-debug-directory %p/Inputs/has-cetdynamicapisinproc.exe | FileCheck %s
+
+CHECK:  DebugEntry {
+CHECK:    Characteristics: 0x0
+CHECK:    Type: ExtendedDLLCharacteristics (0x14)
+CHECK:    ExtendedCharacteristics [ (0x8)
+CHECK:      IMAGE_DLL_CHARACTERISTICS_EX_CET_DYNAMIC_APIS_ALLOW_IN_PROC_ONLY (0x8)
+CHECK:    ]
+CHECK:    RawData (
+CHECK:      0000: 08000000                             |....|
+CHECK:    )
+CHECK:  }
+

llvm/test/tools/llvm-readobj/COFF/Inputs/has-cetipvalidationrelaxed.exe

@@ -0,0 +1,16 @@
+# To regenerate has-cetipvalidationrelaxed.exe
+# $ echo int main() { return 0; } > has-cetipvalidationrelaxed.c
+# $ cl has-cetipvalidationrelaxed.c /link /cetipvalidationrelaxed
+RUN: llvm-readobj --coff-debug-directory %p/Inputs/has-cetipvalidationrelaxed.exe | FileCheck %s
+
+CHECK:  DebugEntry {
+CHECK:    Characteristics: 0x0
+CHECK:    Type: ExtendedDLLCharacteristics (0x14)
+CHECK:    ExtendedCharacteristics [ (0x4)
+CHECK:      IMAGE_DLL_CHARACTERISTICS_EX_CET_SET_CONTEXT_IP_VALIDATION_RELAXED_MODE (0x4)
+CHECK:    ]
+CHECK:    RawData (
+CHECK:      0000: 04000000                             |....|
+CHECK:    )
+CHECK:  }
+

llvm/test/tools/llvm-readobj/COFF/Inputs/has-cetstrict.exe

@@ -0,0 +1,16 @@
+# To regenerate has-hotpatchcompatible.exe
+# $ echo int main() { return 0; } > has-hotpatchcompatible.c
+# $ cl has-hotpatchcompatible.c /link /hotpatchcompatible
+RUN: llvm-readobj --coff-debug-directory %p/Inputs/has-hotpatchcompatible.exe | FileCheck %s
+
+CHECK:  DebugEntry {
+CHECK:    Characteristics: 0x0
+CHECK:    Type: ExtendedDLLCharacteristics (0x14)
+CHECK:    ExtendedCharacteristics [ (0x80)
+CHECK:      IMAGE_DLL_CHARACTERISTICS_EX_HOTPATCH_COMPATIBLE (0x80)
+CHECK:    ]
+CHECK:    RawData (
+CHECK:      0000: 80000000                             |....|
+CHECK:    )
+CHECK:  }
+