[BPF][DebugInfo][NFC] Move BTF.h definitions from BPF target to DebugInfo

There are plans to add some BTF processing to tools like objdump and
readelf. This commit moves BTF.{h,def} files from BPF target specific
location to include/llvm/DebugInfo/* to avoid tools including headers
from lib/Target/*.

Reviewed By: yonghong-song, MaskRay

Differential Revision: https://reviews.llvm.org/D149501

Author: eddyz87

llvm/lib/Target/BPF/BTF.def renamed to llvm/include/llvm/DebugInfo/BTF/BTF.def

@@ -152,9 +152,9 @@ struct BTFEnum {
 /// The exact number of BTFEnum64 is stored in the vlen (of the
 /// info in "struct CommonType").
 struct BTFEnum64 {
-  uint32_t NameOff; ///< Enum name offset in the string table
-  uint32_t Val_Lo32;     ///< Enum member lo32 value
-  uint32_t Val_Hi32;     ///< Enum member hi32 value
+  uint32_t NameOff;  ///< Enum name offset in the string table
+  uint32_t Val_Lo32; ///< Enum member lo32 value
+  uint32_t Val_Hi32; ///< Enum member hi32 value
 };
 
 /// BTF_KIND_ARRAY is followed by one "struct BTFArray".
@@ -218,10 +218,10 @@ struct ExtHeader {
   uint8_t Flags;
   uint32_t HdrLen;
 
-  uint32_t FuncInfoOff;    ///< Offset of func info section
-  uint32_t FuncInfoLen;    ///< Length of func info section
-  uint32_t LineInfoOff;    ///< Offset of line info section
-  uint32_t LineInfoLen;    ///< Length of line info section
+  uint32_t FuncInfoOff;   ///< Offset of func info section
+  uint32_t FuncInfoLen;   ///< Length of func info section
+  uint32_t LineInfoOff;   ///< Offset of line info section
+  uint32_t LineInfoLen;   ///< Length of line info section
   uint32_t FieldRelocOff; ///< Offset of offset reloc section
   uint32_t FieldRelocLen; ///< Length of offset reloc section
 };
@@ -263,7 +263,7 @@ struct BPFFieldReloc {
 
 /// Specifying offset relocation's in one section.
 struct SecFieldReloc {
-  uint32_t SecNameOff;     ///< Section name index in the .BTF string table
+  uint32_t SecNameOff;    ///< Section name index in the .BTF string table
   uint32_t NumFieldReloc; ///< Number of offset reloc's in this section
 };
 

llvm/lib/Target/BPF/BTF.h renamed to llvm/include/llvm/DebugInfo/BTF/BTF.h

@@ -30,7 +30,7 @@ using namespace llvm;
 
 static const char *BTFKindStr[] = {
 #define HANDLE_BTF_KIND(ID, NAME) "BTF_KIND_" #NAME,
-#include "BTF.def"
+#include "llvm/DebugInfo/BTF/BTF.def"
 };
 
 /// Emit a BTF common type.

llvm/lib/Target/BPF/BTFDebug.cpp

@@ -16,11 +16,11 @@
 
 #include "llvm/ADT/StringMap.h"
 #include "llvm/CodeGen/DebugHandlerBase.h"
+#include "llvm/DebugInfo/BTF/BTF.h"
 #include <cstdint>
 #include <map>
 #include <set>
 #include <unordered_map>
-#include "BTF.h"
 
 namespace llvm {