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-rw-r--r--runtime/elf_file.h104
1 files changed, 54 insertions, 50 deletions
diff --git a/runtime/elf_file.h b/runtime/elf_file.h
index baf4356..8a0a5f8 100644
--- a/runtime/elf_file.h
+++ b/runtime/elf_file.h
@@ -39,15 +39,15 @@ class ElfFile {
// Load segments into memory based on PT_LOAD program headers
- File& GetFile() const {
+ const File& GetFile() const {
return *file_;
}
- byte* Begin() {
+ byte* Begin() const {
return map_->Begin();
}
- byte* End() {
+ byte* End() const {
return map_->End();
}
@@ -55,24 +55,24 @@ class ElfFile {
return map_->Size();
}
- Elf32_Ehdr& GetHeader();
+ Elf32_Ehdr& GetHeader() const;
- Elf32_Word GetProgramHeaderNum();
- Elf32_Phdr& GetProgramHeader(Elf32_Word);
- Elf32_Phdr* FindProgamHeaderByType(Elf32_Word type);
+ Elf32_Word GetProgramHeaderNum() const;
+ Elf32_Phdr& GetProgramHeader(Elf32_Word) const;
+ Elf32_Phdr* FindProgamHeaderByType(Elf32_Word type) const;
- Elf32_Word GetSectionHeaderNum();
- Elf32_Shdr& GetSectionHeader(Elf32_Word);
- Elf32_Shdr* FindSectionByType(Elf32_Word type);
+ Elf32_Word GetSectionHeaderNum() const;
+ Elf32_Shdr& GetSectionHeader(Elf32_Word) const;
+ Elf32_Shdr* FindSectionByType(Elf32_Word type) const;
- Elf32_Shdr& GetSectionNameStringSection();
+ Elf32_Shdr& GetSectionNameStringSection() const;
// Find .dynsym using .hash for more efficient lookup than FindSymbolAddress.
- byte* FindDynamicSymbolAddress(const std::string& symbol_name);
+ const byte* FindDynamicSymbolAddress(const std::string& symbol_name) const;
static bool IsSymbolSectionType(Elf32_Word section_type);
- Elf32_Word GetSymbolNum(Elf32_Shdr&);
- Elf32_Sym& GetSymbol(Elf32_Word section_type, Elf32_Word i);
+ Elf32_Word GetSymbolNum(Elf32_Shdr&) const;
+ Elf32_Sym& GetSymbol(Elf32_Word section_type, Elf32_Word i) const;
// Find symbol in specified table, returning NULL if it is not found.
//
@@ -83,73 +83,77 @@ class ElfFile {
// should be set unless only a small number of symbols will be
// looked up.
Elf32_Sym* FindSymbolByName(Elf32_Word section_type,
- const std::string& symbol_name,
- bool build_map);
+ 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.
Elf32_Addr FindSymbolAddress(Elf32_Word section_type,
- const std::string& symbol_name,
- bool build_map);
+ 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(Elf32_Shdr&, Elf32_Word);
+ const char* GetString(Elf32_Shdr&, Elf32_Word) const;
// Lookup a string by section type. Returns NULL for special 0 offset.
- const char* GetString(Elf32_Word section_type, Elf32_Word);
+ const char* GetString(Elf32_Word section_type, Elf32_Word) const;
- Elf32_Word GetDynamicNum();
- Elf32_Dyn& GetDynamic(Elf32_Word);
- Elf32_Word FindDynamicValueByType(Elf32_Sword type);
+ Elf32_Word GetDynamicNum() const;
+ Elf32_Dyn& GetDynamic(Elf32_Word) const;
+ Elf32_Word FindDynamicValueByType(Elf32_Sword type) const;
- Elf32_Word GetRelNum(Elf32_Shdr&);
- Elf32_Rel& GetRel(Elf32_Shdr&, Elf32_Word);
+ Elf32_Word GetRelNum(Elf32_Shdr&) const;
+ Elf32_Rel& GetRel(Elf32_Shdr&, Elf32_Word) const;
- Elf32_Word GetRelaNum(Elf32_Shdr&);
- Elf32_Rela& GetRela(Elf32_Shdr&, Elf32_Word);
+ Elf32_Word GetRelaNum(Elf32_Shdr&) const;
+ Elf32_Rela& GetRela(Elf32_Shdr&, Elf32_Word) const;
// Returns the expected size when the file is loaded at runtime
- size_t GetLoadedSize();
+ size_t GetLoadedSize() const;
// Load segments into memory based on PT_LOAD program headers.
// executable is true at run time, false at compile time.
bool Load(bool executable, std::string* error_msg);
private:
- ElfFile();
+ ElfFile(File* file, bool writable, bool program_header_only);
- bool Setup(File* file, bool writable, bool program_header_only, std::string* error_msg);
+ bool Setup(std::string* error_msg);
bool SetMap(MemMap* map, std::string* error_msg);
- byte* GetProgramHeadersStart();
- byte* GetSectionHeadersStart();
- Elf32_Phdr& GetDynamicProgramHeader();
- Elf32_Dyn* GetDynamicSectionStart();
- Elf32_Sym* GetSymbolSectionStart(Elf32_Word section_type);
- const char* GetStringSectionStart(Elf32_Word section_type);
- Elf32_Rel* GetRelSectionStart(Elf32_Shdr&);
- Elf32_Rela* GetRelaSectionStart(Elf32_Shdr&);
- Elf32_Word* GetHashSectionStart();
- Elf32_Word GetHashBucketNum();
- Elf32_Word GetHashChainNum();
- Elf32_Word GetHashBucket(size_t i);
- Elf32_Word GetHashChain(size_t i);
+ byte* GetProgramHeadersStart() const;
+ byte* GetSectionHeadersStart() const;
+ Elf32_Phdr& GetDynamicProgramHeader() const;
+ Elf32_Dyn* GetDynamicSectionStart() const;
+ Elf32_Sym* GetSymbolSectionStart(Elf32_Word section_type) const;
+ const char* GetStringSectionStart(Elf32_Word section_type) const;
+ Elf32_Rel* GetRelSectionStart(Elf32_Shdr&) const;
+ Elf32_Rela* GetRelaSectionStart(Elf32_Shdr&) const;
+ Elf32_Word* GetHashSectionStart() const;
+ Elf32_Word GetHashBucketNum() const;
+ Elf32_Word GetHashChainNum() const;
+ Elf32_Word GetHashBucket(size_t i) const;
+ Elf32_Word GetHashChain(size_t i) const;
typedef std::map<std::string, Elf32_Sym*> SymbolTable;
SymbolTable** GetSymbolTable(Elf32_Word section_type);
- File* file_;
- bool writable_;
- bool program_header_only_;
+ bool ValidPointer(const byte* start) const;
- // ELF header mapping. If program_header_only_ is false, will actually point to the entire elf file.
+ const File* const file_;
+ const bool writable_;
+ const bool program_header_only_;
+
+ // ELF header mapping. If program_header_only_ is false, will
+ // actually point to the entire elf file.
UniquePtr<MemMap> map_;
Elf32_Ehdr* header_;
std::vector<MemMap*> segments_;
- // Pointer to start of first PT_LOAD program segment after Load() when program_header_only_ is true.
+ // 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.
@@ -161,8 +165,8 @@ class ElfFile {
Elf32_Dyn* dynamic_section_start_;
Elf32_Sym* symtab_section_start_;
Elf32_Sym* dynsym_section_start_;
- const char* strtab_section_start_;
- const char* dynstr_section_start_;
+ char* strtab_section_start_;
+ char* dynstr_section_start_;
Elf32_Word* hash_section_start_;
SymbolTable* symtab_symbol_table_;
generated by cgit v1.1 at 2025-10-14 10:34:30 +0000