The Tor Browser: comparison tools/profiler/LulElfInt.h

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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// Copyright (c) 2006, 2012, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// This file is derived from the following files in
+// toolkit/crashreporter/google-breakpad:
+//   src/common/android/include/elf.h
+//   src/common/linux/elfutils.h
+//   src/common/linux/file_id.h
+//   src/common/linux/elfutils-inl.h
+#ifndef LulElfInt_h
+#define LulElfInt_h
+// This header defines functions etc internal to the ELF reader.  It
+// should not be included outside of LulElf.cpp.
+#include <elf.h>
+#include <stdlib.h>
+#include "mozilla/Assertions.h"
+#include "LulPlatformMacros.h"
+// (derived from)
+// elfutils.h: Utilities for dealing with ELF files.
+//
+#if defined(LUL_OS_android)
+// From toolkit/crashreporter/google-breakpad/src/common/android/include/elf.h
+// The Android headers don't always define this constant.
+#ifndef EM_X86_64
+#define EM_X86_64  62
+#endif
+#ifndef EM_PPC64
+#define EM_PPC64   21
+#endif
+#ifndef EM_S390
+#define EM_S390    22
+#endif
+#ifndef NT_GNU_BUILD_ID
+#define NT_GNU_BUILD_ID 3
+#endif
+#define ElfW(type)      _ElfW (Elf, ELFSIZE, type)
+#define _ElfW(e,w,t)    _ElfW_1 (e, w, _##t)
+#define _ElfW_1(e,w,t)  e##w##t
+//FIXME
+extern "C" {
+extern char*  basename(const char*  path);
+};
+#else
+# include <link.h>
+#endif
+namespace lul {
+// Traits classes so consumers can write templatized code to deal
+// with specific ELF bits.
+struct ElfClass32 {
+typedef Elf32_Addr Addr;
+typedef Elf32_Ehdr Ehdr;
+typedef Elf32_Nhdr Nhdr;
+typedef Elf32_Phdr Phdr;
+typedef Elf32_Shdr Shdr;
+typedef Elf32_Half Half;
+typedef Elf32_Off Off;
+typedef Elf32_Word Word;
+static const int kClass = ELFCLASS32;
+static const size_t kAddrSize = sizeof(Elf32_Addr);
+};
+struct ElfClass64 {
+typedef Elf64_Addr Addr;
+typedef Elf64_Ehdr Ehdr;
+typedef Elf64_Nhdr Nhdr;
+typedef Elf64_Phdr Phdr;
+typedef Elf64_Shdr Shdr;
+typedef Elf64_Half Half;
+typedef Elf64_Off Off;
+typedef Elf64_Word Word;
+static const int kClass = ELFCLASS64;
+static const size_t kAddrSize = sizeof(Elf64_Addr);
+};
+bool IsValidElf(const void* elf_header);
+int ElfClass(const void* elf_base);
+// Attempt to find a section named |section_name| of type |section_type|
+// in the ELF binary data at |elf_mapped_base|. On success, returns true
+// and sets |*section_start| to point to the start of the section data,
+// and |*section_size| to the size of the section's data. If |elfclass|
+// is not NULL, set |*elfclass| to the ELF file class.
+bool FindElfSection(const void *elf_mapped_base,
+const char *section_name,
+uint32_t section_type,
+const void **section_start,
+int *section_size,
+int *elfclass);
+// Internal helper method, exposed for convenience for callers
+// that already have more info.
+template<typename ElfClass>
+const typename ElfClass::Shdr*
+FindElfSectionByName(const char* name,
+typename ElfClass::Word section_type,
+const typename ElfClass::Shdr* sections,
+const char* section_names,
+const char* names_end,
+int nsection);
+// Attempt to find the first segment of type |segment_type| in the ELF
+// binary data at |elf_mapped_base|. On success, returns true and sets
+// |*segment_start| to point to the start of the segment data, and
+// and |*segment_size| to the size of the segment's data. If |elfclass|
+// is not NULL, set |*elfclass| to the ELF file class.
+bool FindElfSegment(const void *elf_mapped_base,
+uint32_t segment_type,
+const void **segment_start,
+int *segment_size,
+int *elfclass);
+// Convert an offset from an Elf header into a pointer to the mapped
+// address in the current process. Takes an extra template parameter
+// to specify the return type to avoid having to dynamic_cast the
+// result.
+template<typename ElfClass, typename T>
+const T*
+GetOffset(const typename ElfClass::Ehdr* elf_header,
+typename ElfClass::Off offset);
+// (derived from)
+// file_id.h: Return a unique identifier for a file
+//
+static const size_t kMDGUIDSize = sizeof(MDGUID);
+class FileID {
+public:
+// Load the identifier for the elf file mapped into memory at |base| into
+// |identifier|.  Return false if the identifier could not be created for the
+// file.
+static bool ElfFileIdentifierFromMappedFile(const void* base,
+uint8_t identifier[kMDGUIDSize]);
+// Convert the |identifier| data to a NULL terminated string.  The string will
+// be formatted as a UUID (e.g., 22F065BB-FC9C-49F7-80FE-26A7CEBD7BCE).
+// The |buffer| should be at least 37 bytes long to receive all of the data
+// and termination.  Shorter buffers will contain truncated data.
+static void ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize],
+char* buffer, int buffer_length);
+};
+template<typename ElfClass, typename T>
+const T* GetOffset(const typename ElfClass::Ehdr* elf_header,
+typename ElfClass::Off offset) {
+return reinterpret_cast<const T*>(reinterpret_cast<uintptr_t>(elf_header) +
+offset);
+}
+template<typename ElfClass>
+const typename ElfClass::Shdr* FindElfSectionByName(
+const char* name,
+typename ElfClass::Word section_type,
+const typename ElfClass::Shdr* sections,
+const char* section_names,
+const char* names_end,
+int nsection) {
+MOZ_ASSERT(name != NULL);
+MOZ_ASSERT(sections != NULL);
+MOZ_ASSERT(nsection > 0);
+int name_len = strlen(name);
+if (name_len == 0)
+return NULL;
+for (int i = 0; i < nsection; ++i) {
+const char* section_name = section_names + sections[i].sh_name;
+if (sections[i].sh_type == section_type &&
+names_end - section_name >= name_len + 1 &&
+strcmp(name, section_name) == 0) {
+return sections + i;
+}
+}
+return NULL;
+}
+} // namespace lul
+// And finally, the external interface, offered to LulMain.cpp
+#include "LulElfExt.h"
+#endif // LulElfInt_h

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comparison: tools/profiler/LulElfInt.h

tools/profiler/LulElfInt.h