Create separate Android.mk for main build targets

The runtime, compiler, dex2oat, and oatdump now are in seperate trees
to prevent dependency creep.  They can now be individually built
without rebuilding the rest of the art projects. dalvikvm and jdwpspy
were already this way. Builds in the art directory should behave as
before, building everything including tests.

Change-Id: Ic6b1151e5ed0f823c3dd301afd2b13eb2d8feb81

1 files changed, 174 insertions, 0 deletions

diff --git a/runtime/elf_file.h b/runtime/elf_file.h
new file mode 100644
index 0000000000..59ce7f5bfd
--- /dev/null
+++ b/runtime/elf_file.h
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2012 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 ART_SRC_ELF_FILE_H_
+#define ART_SRC_ELF_FILE_H_
+
+#include <map>
+#include <vector>
+
+#include <llvm/Support/ELF.h>
+
+#include "base/unix_file/fd_file.h"
+#include "globals.h"
+#include "mem_map.h"
+#include "os.h"
+#include "UniquePtr.h"
+
+namespace art {
+
+// Used for compile time and runtime for ElfFile access. Because of
+// the need for use at runtime, cannot directly use LLVM classes such as
+// ELFObjectFile.
+class ElfFile {
+ public:
+  static ElfFile* Open(File* file, bool writable, bool program_header_only);
+  ~ElfFile();
+
+  // Load segments into memory based on PT_LOAD program headers
+
+  File& GetFile() const {
+    return *file_;
+  }
+
+  byte* Begin() {
+    return map_->Begin();
+  }
+
+  byte* End() {
+    return map_->End();
+  }
+
+  size_t Size() const {
+    return map_->Size();
+  }
+
+  ::llvm::ELF::Elf32_Ehdr& GetHeader();
+
+  ::llvm::ELF::Elf32_Word GetProgramHeaderNum();
+  ::llvm::ELF::Elf32_Phdr& GetProgramHeader(::llvm::ELF::Elf32_Word);
+  ::llvm::ELF::Elf32_Phdr* FindProgamHeaderByType(::llvm::ELF::Elf32_Word type);
+
+  ::llvm::ELF::Elf32_Word GetSectionHeaderNum();
+  ::llvm::ELF::Elf32_Shdr& GetSectionHeader(::llvm::ELF::Elf32_Word);
+  ::llvm::ELF::Elf32_Shdr* FindSectionByType(::llvm::ELF::Elf32_Word type);
+
+  ::llvm::ELF::Elf32_Shdr& GetSectionNameStringSection();
+
+  // Find .dynsym using .hash for more efficient lookup than FindSymbolAddress.
+  byte* FindDynamicSymbolAddress(const std::string& symbol_name);
+
+  static bool IsSymbolSectionType(::llvm::ELF::Elf32_Word section_type);
+  ::llvm::ELF::Elf32_Word GetSymbolNum(::llvm::ELF::Elf32_Shdr&);
+  ::llvm::ELF::Elf32_Sym& GetSymbol(::llvm::ELF::Elf32_Word section_type, ::llvm::ELF::Elf32_Word i);
+
+  // Find symbol in specified table, returning NULL if it is not found.
+  //
+  // If build_map is true, builds a map to speed repeated access. The
+  // map does not included untyped symbol values (aka STT_NOTYPE)
+  // since they can contain duplicates. If build_map is false, the map
+  // will be used if it was already created. Typically build_map
+  // should be set unless only a small number of symbols will be
+  // looked up.
+  ::llvm::ELF::Elf32_Sym* FindSymbolByName(::llvm::ELF::Elf32_Word section_type,
+                                           const std::string& symbol_name,
+                                           bool build_map);
+
+  // Find address of symbol in specified table, returning 0 if it is
+  // not found. See FindSymbolByName for an explanation of build_map.
+  ::llvm::ELF::Elf32_Addr FindSymbolAddress(::llvm::ELF::Elf32_Word section_type,
+                                            const std::string& symbol_name,
+                                            bool build_map);
+
+  // Lookup a string given string section and offset. Returns NULL for
+  // special 0 offset.
+  const char* GetString(::llvm::ELF::Elf32_Shdr&, ::llvm::ELF::Elf32_Word);
+
+  // Lookup a string by section type. Returns NULL for special 0 offset.
+  const char* GetString(::llvm::ELF::Elf32_Word section_type, ::llvm::ELF::Elf32_Word);
+
+  ::llvm::ELF::Elf32_Word GetDynamicNum();
+  ::llvm::ELF::Elf32_Dyn& GetDynamic(::llvm::ELF::Elf32_Word);
+  ::llvm::ELF::Elf32_Word FindDynamicValueByType(::llvm::ELF::Elf32_Sword type);
+
+  ::llvm::ELF::Elf32_Word GetRelNum(::llvm::ELF::Elf32_Shdr&);
+  ::llvm::ELF::Elf32_Rel& GetRel(::llvm::ELF::Elf32_Shdr&, ::llvm::ELF::Elf32_Word);
+
+  ::llvm::ELF::Elf32_Word GetRelaNum(::llvm::ELF::Elf32_Shdr&);
+  ::llvm::ELF::Elf32_Rela& GetRela(::llvm::ELF::Elf32_Shdr&, ::llvm::ELF::Elf32_Word);
+
+  // Returns the expected size when the file is loaded at runtime
+  size_t GetLoadedSize();
+
+  // Load segments into memory based on PT_LOAD program headers
+  bool Load();
+
+ private:
+  ElfFile();
+
+  bool Setup(File* file, bool writable, bool program_header_only);
+
+  bool SetMap(MemMap* map);
+
+  byte* GetProgramHeadersStart();
+  byte* GetSectionHeadersStart();
+  ::llvm::ELF::Elf32_Phdr& GetDynamicProgramHeader();
+  ::llvm::ELF::Elf32_Dyn* GetDynamicSectionStart();
+  ::llvm::ELF::Elf32_Sym* GetSymbolSectionStart(::llvm::ELF::Elf32_Word section_type);
+  const char* GetStringSectionStart(::llvm::ELF::Elf32_Word section_type);
+  ::llvm::ELF::Elf32_Rel* GetRelSectionStart(::llvm::ELF::Elf32_Shdr&);
+  ::llvm::ELF::Elf32_Rela* GetRelaSectionStart(::llvm::ELF::Elf32_Shdr&);
+  ::llvm::ELF::Elf32_Word* GetHashSectionStart();
+  ::llvm::ELF::Elf32_Word GetHashBucketNum();
+  ::llvm::ELF::Elf32_Word GetHashChainNum();
+  ::llvm::ELF::Elf32_Word GetHashBucket(size_t i);
+  ::llvm::ELF::Elf32_Word GetHashChain(size_t i);
+
+  typedef std::map<std::string, ::llvm::ELF::Elf32_Sym*> SymbolTable;
+  SymbolTable** GetSymbolTable(::llvm::ELF::Elf32_Word section_type);
+
+  File* file_;
+  bool writable_;
+  bool program_header_only_;
+
+  // ELF header mapping. If program_header_only_ is false, will actually point to the entire elf file.
+  UniquePtr<MemMap> map_;
+  ::llvm::ELF::Elf32_Ehdr* header_;
+  std::vector<MemMap*> segments_;
+
+  // Pointer to start of first PT_LOAD program segment after Load() when program_header_only_ is true.
+  byte* base_address_;
+
+  // The program header should always available but use GetProgramHeadersStart() to be sure.
+  byte* program_headers_start_;
+
+  // Conditionally available values. Use accessors to ensure they exist if they are required.
+  byte* section_headers_start_;
+  ::llvm::ELF::Elf32_Phdr* dynamic_program_header_;
+  ::llvm::ELF::Elf32_Dyn* dynamic_section_start_;
+  ::llvm::ELF::Elf32_Sym* symtab_section_start_;
+  ::llvm::ELF::Elf32_Sym* dynsym_section_start_;
+  const char* strtab_section_start_;
+  const char* dynstr_section_start_;
+  ::llvm::ELF::Elf32_Word* hash_section_start_;
+
+  SymbolTable* symtab_symbol_table_;
+  SymbolTable* dynsym_symbol_table_;
+};
+
+}  // namespace art
+
+#endif  // ART_SRC_ELF_FILE_H_