Add DwarfMemory class.
Bug: 23762183
Test: Passes new unit tests.
Change-Id: I80293af0b5a8a042195c37a06d64082d2f7c781a
diff --git a/libunwindstack/DwarfMemory.h b/libunwindstack/DwarfMemory.h
new file mode 100644
index 0000000..a304dd9
--- /dev/null
+++ b/libunwindstack/DwarfMemory.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _LIBUNWINDSTACK_DWARF_MEMORY_H
+#define _LIBUNWINDSTACK_DWARF_MEMORY_H
+
+#include <stdint.h>
+
+// Forward declarations.
+class Memory;
+
+class DwarfMemory {
+ public:
+ DwarfMemory(Memory* memory) : memory_(memory) {}
+ virtual ~DwarfMemory() = default;
+
+ bool ReadBytes(void* dst, size_t num_bytes);
+
+ template <typename SignedType>
+ bool ReadSigned(uint64_t* value);
+
+ bool ReadULEB128(uint64_t* value);
+
+ bool ReadSLEB128(int64_t* value);
+
+ template <typename AddressType>
+ size_t GetEncodedSize(uint8_t encoding);
+
+ bool AdjustEncodedValue(uint8_t encoding, uint64_t* value);
+
+ template <typename AddressType>
+ bool ReadEncodedValue(uint8_t encoding, uint64_t* value);
+
+ uint64_t cur_offset() { return cur_offset_; }
+ void set_cur_offset(uint64_t cur_offset) { cur_offset_ = cur_offset; }
+
+ void set_pc_offset(uint64_t offset) { pc_offset_ = offset; }
+ void clear_pc_offset() { pc_offset_ = static_cast<uint64_t>(-1); }
+
+ void set_data_offset(uint64_t offset) { data_offset_ = offset; }
+ void clear_data_offset() { data_offset_ = static_cast<uint64_t>(-1); }
+
+ void set_func_offset(uint64_t offset) { func_offset_ = offset; }
+ void clear_func_offset() { func_offset_ = static_cast<uint64_t>(-1); }
+
+ void set_text_offset(uint64_t offset) { text_offset_ = offset; }
+ void clear_text_offset() { text_offset_ = static_cast<uint64_t>(-1); }
+
+ private:
+ Memory* memory_;
+ uint64_t cur_offset_ = 0;
+
+ uint64_t pc_offset_ = static_cast<uint64_t>(-1);
+ uint64_t data_offset_ = static_cast<uint64_t>(-1);
+ uint64_t func_offset_ = static_cast<uint64_t>(-1);
+ uint64_t text_offset_ = static_cast<uint64_t>(-1);
+};
+
+#endif // _LIBUNWINDSTACK_DWARF_MEMORY_H