upload android base code part6

android/system/extras/simpleperf/read_elf.h

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2015 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 SIMPLE_PERF_READ_ELF_H_
+#define SIMPLE_PERF_READ_ELF_H_
+
+#include <functional>
+#include <ostream>
+#include <string>
+#include "build_id.h"
+
+// Read ELF functions are called in different situations, so it is hard to
+// decide whether to report error or not. So read ELF functions don't report
+// error when something wrong happens, instead they return ElfStatus, which
+// identifies different errors met while reading elf file.
+enum ElfStatus {
+  NO_ERROR,
+  FILE_NOT_FOUND,
+  READ_FAILED,
+  FILE_MALFORMED,
+  NO_SYMBOL_TABLE,
+  NO_BUILD_ID,
+  BUILD_ID_MISMATCH,
+  SECTION_NOT_FOUND,
+};
+
+std::ostream& operator<<(std::ostream& os, const ElfStatus& status);
+
+ElfStatus GetBuildIdFromNoteFile(const std::string& filename, BuildId* build_id);
+ElfStatus GetBuildIdFromElfFile(const std::string& filename, BuildId* build_id);
+ElfStatus GetBuildIdFromEmbeddedElfFile(const std::string& filename, uint64_t file_offset,
+                                        uint32_t file_size, BuildId* build_id);
+
+// The symbol prefix used to indicate that the symbol belongs to android linker.
+static const std::string linker_prefix = "__dl_";
+
+struct ElfFileSymbol {
+  uint64_t vaddr;
+  uint64_t len;
+  bool is_func;
+  bool is_label;
+  bool is_in_text_section;
+  std::string name;
+
+  ElfFileSymbol() : vaddr(0), len(0), is_func(false), is_label(false), is_in_text_section(false) {
+  }
+};
+
+ElfStatus ParseSymbolsFromElfFile(const std::string& filename,
+                                  const BuildId& expected_build_id,
+                                  const std::function<void(const ElfFileSymbol&)>& callback);
+ElfStatus ParseSymbolsFromEmbeddedElfFile(const std::string& filename, uint64_t file_offset,
+                                          uint32_t file_size, const BuildId& expected_build_id,
+                                          const std::function<void(const ElfFileSymbol&)>& callback);
+
+ElfStatus ReadMinExecutableVirtualAddressFromElfFile(const std::string& filename,
+                                                     const BuildId& expected_build_id,
+                                                     uint64_t* min_addr);
+
+ElfStatus ReadSectionFromElfFile(const std::string& filename, const std::string& section_name,
+                                 std::string* content);
+
+// Expose the following functions for unit tests.
+bool IsArmMappingSymbol(const char* name);
+ElfStatus IsValidElfFile(int fd);
+ElfStatus IsValidElfPath(const std::string& filename);
+bool GetBuildIdFromNoteSection(const char* section, size_t section_size, BuildId* build_id);
+
+#endif  // SIMPLE_PERF_READ_ELF_H_