[lldb] Split CTF parsing and type creation (NFC)

Separate parsing CTF and creating LLDB types. This is a prerequisite to
parsing forward references and recursive types.

Differential revision: https://reviews.llvm.org/D156447

Author: JDevlieghere

lldb/source/Plugins/SymbolFile/CTF/CTFTypes.h

@@ -0,0 +1,168 @@
+//===-- CTFTypes.h ----------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SOURCE_PLUGINS_SYMBOLFILE_CTF_CTFTYPES_H
+#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_CTF_CTFTYPES_H
+
+#include "lldb/lldb-types.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace lldb_private {
+
+struct CTFType {
+  enum Kind : uint32_t {
+    eUnknown = 0,
+    eInteger = 1,
+    eFloat = 2,
+    ePointer = 3,
+    eArray = 4,
+    eFunction = 5,
+    eStruct = 6,
+    eUnion = 7,
+    eEnum = 8,
+    eForward = 9,
+    eTypedef = 10,
+    eVolatile = 11,
+    eConst = 12,
+    eRestrict = 13,
+    eSlice = 14,
+  };
+
+  Kind kind;
+  lldb::user_id_t uid;
+  llvm::StringRef name;
+
+  CTFType(Kind kind, lldb::user_id_t uid, llvm::StringRef name)
+      : kind(kind), uid(uid), name(name) {}
+};
+
+struct CTFInteger : public CTFType {
+  CTFInteger(lldb::user_id_t uid, llvm::StringRef name, uint32_t bits,
+             uint32_t encoding)
+      : CTFType(eInteger, uid, name), bits(bits), encoding(encoding) {}
+
+  uint32_t bits;
+  uint32_t encoding;
+};
+
+struct CTFModifier : public CTFType {
+protected:
+  CTFModifier(Kind kind, lldb::user_id_t uid, uint32_t type)
+      : CTFType(kind, uid, ""), type(type) {}
+
+public:
+  uint32_t type;
+};
+
+struct CTFPointer : public CTFModifier {
+  CTFPointer(lldb::user_id_t uid, uint32_t type)
+      : CTFModifier(ePointer, uid, type) {}
+};
+
+struct CTFConst : public CTFModifier {
+  CTFConst(lldb::user_id_t uid, uint32_t type)
+      : CTFModifier(eConst, uid, type) {}
+};
+
+struct CTFVolatile : public CTFModifier {
+  CTFVolatile(lldb::user_id_t uid, uint32_t type)
+      : CTFModifier(eVolatile, uid, type) {}
+};
+
+struct CTFRestrict : public CTFModifier {
+  CTFRestrict(lldb::user_id_t uid, uint32_t type)
+      : CTFModifier(eRestrict, uid, type) {}
+};
+
+struct CTFTypedef : public CTFType {
+  CTFTypedef(lldb::user_id_t uid, llvm::StringRef name, uint32_t type)
+      : CTFType(eTypedef, uid, name), type(type) {}
+
+  uint32_t type;
+};
+
+struct CTFArray : public CTFType {
+  CTFArray(lldb::user_id_t uid, llvm::StringRef name, uint32_t type,
+           uint32_t index, uint32_t nelems)
+      : CTFType(eArray, uid, name), type(type), index(index), nelems(nelems) {}
+
+  uint32_t type;
+  uint32_t index;
+  uint32_t nelems;
+};
+
+struct CTFEnum : public CTFType {
+  struct Value {
+    Value(llvm::StringRef name, uint32_t value) : name(name), value(value){};
+    llvm::StringRef name;
+    uint32_t value;
+  };
+
+  CTFEnum(lldb::user_id_t uid, llvm::StringRef name, uint32_t nelems,
+          uint32_t size, std::vector<Value> values)
+      : CTFType(eEnum, uid, name), nelems(nelems), size(size),
+        values(std::move(values)) {
+    assert(this->values.size() == nelems);
+  }
+
+  uint32_t nelems;
+  uint32_t size;
+  std::vector<Value> values;
+};
+
+struct CTFFunction : public CTFType {
+  CTFFunction(lldb::user_id_t uid, llvm::StringRef name, uint32_t nargs,
+              uint32_t return_type, std::vector<uint32_t> args, bool variadic)
+      : CTFType(eFunction, uid, name), nargs(nargs), return_type(return_type),
+        args(std::move(args)), variadic(variadic) {}
+
+  uint32_t nargs;
+  uint32_t return_type;
+
+  std::vector<uint32_t> args;
+  bool variadic = false;
+};
+
+struct CTFRecord : public CTFType {
+public:
+  struct Field {
+    Field(llvm::StringRef name, uint32_t type, uint16_t offset,
+          uint16_t padding)
+        : name(name), type(type), offset(offset), padding(padding) {}
+
+    llvm::StringRef name;
+    uint32_t type;
+    uint16_t offset;
+    uint16_t padding;
+  };
+
+  CTFRecord(Kind kind, lldb::user_id_t uid, llvm::StringRef name,
+            uint32_t nfields, uint32_t size, std::vector<Field> fields)
+      : CTFType(kind, uid, name), nfields(nfields), size(size),
+        fields(std::move(fields)) {}
+
+  uint32_t nfields;
+  uint32_t size;
+  std::vector<Field> fields;
+};
+
+struct CTFStruct : public CTFRecord {
+  CTFStruct(lldb::user_id_t uid, llvm::StringRef name, uint32_t nfields,
+            uint32_t size, std::vector<Field> fields)
+      : CTFRecord(eStruct, uid, name, nfields, size, std::move(fields)){};
+};
+
+struct CTFUnion : public CTFRecord {
+  CTFUnion(lldb::user_id_t uid, llvm::StringRef name, uint32_t nfields,
+           uint32_t size, std::vector<Field> fields)
+      : CTFRecord(eUnion, uid, name, nfields, size, std::move(fields)){};
+};
+
+} // namespace lldb_private
+
+#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_CTF_CTFTYPES_H