168 lines
4.4 KiB
C++
168 lines
4.4 KiB
C++
// stringpool.h -- a string pool for gold -*- C++ -*-
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#include <string>
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#include <list>
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// Stringpool
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// Manage a pool of unique strings.
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#ifndef GOLD_STRINGPOOL_H
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#define GOLD_STRINGPOOL_H
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namespace gold
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{
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class Output_file;
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template<typename Stringpool_char>
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class Stringpool_template
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{
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public:
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// The type of a key into the stringpool. A key value will always
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// be the same during any run of the linker. The string pointers
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// may change when using address space randomization. We use key
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// values in order to get repeatable runs when the value is inserted
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// into an unordered hash table. Zero is never a valid key.
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typedef size_t Key;
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// Create a Stringpool. ZERO_NULL is true if we should reserve
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// offset 0 to hold the empty string.
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Stringpool_template(bool zero_null = true);
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~Stringpool_template();
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// Add a string to the pool. This returns a canonical permanent
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// pointer to the string. If PKEY is not NULL, this sets *PKEY to
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// the key for the string.
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const Stringpool_char*
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add(const Stringpool_char*, Key* pkey);
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const Stringpool_char*
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add(const std::basic_string<Stringpool_char>& s, Key* pkey)
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{ return this->add(s.c_str(), pkey); }
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// Add the prefix of a string to the pool.
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const Stringpool_char*
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add(const Stringpool_char*, size_t, Key* pkey);
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// If a string is present, return the canonical string. Otherwise,
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// return NULL. If PKEY is not NULL, set *PKEY to the key.
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const Stringpool_char*
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find(const Stringpool_char*, Key* pkey) const;
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// Turn the stringpool into an ELF strtab: determine the offsets of
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// all the strings.
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void
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set_string_offsets();
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// Get the offset of a string in an ELF strtab. This returns the
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// offset in bytes, not characters.
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off_t
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get_offset(const Stringpool_char*) const;
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off_t
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get_offset(const std::basic_string<Stringpool_char>& s) const
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{ return this->get_offset(s.c_str()); }
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// Get the size of the ELF strtab. This returns the number of
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// bytes, not characters.
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off_t
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get_strtab_size() const
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{
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gold_assert(this->strtab_size_ != 0);
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return this->strtab_size_;
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}
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// Write the strtab into the output file at the specified offset.
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void
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write(Output_file*, off_t offset);
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private:
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Stringpool_template(const Stringpool_template&);
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Stringpool_template& operator=(const Stringpool_template&);
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// Return the length of a string.
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static size_t
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string_length(const Stringpool_char*);
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// We store the actual data in a list of these buffers.
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struct Stringdata
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{
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// Length of data in buffer.
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size_t len;
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// Allocated size of buffer.
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size_t alc;
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// Buffer index.
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unsigned int index;
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// Buffer.
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char data[1];
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};
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// Copy a string into the buffers, returning a canonical string.
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const Stringpool_char*
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add_string(const Stringpool_char*, Key*);
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struct Stringpool_hash
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{
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size_t
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operator()(const Stringpool_char*) const;
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};
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struct Stringpool_eq
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{
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bool
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operator()(const Stringpool_char* p1, const Stringpool_char* p2) const;
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};
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// Return whether s1 is a suffix of s2.
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static bool
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is_suffix(const Stringpool_char* s1, const Stringpool_char* s2);
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// The hash table is a map from string names to a pair of Key and
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// ELF strtab offsets. We only use the offsets if we turn this into
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// an ELF strtab section.
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typedef std::pair<Key, off_t> Val;
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#ifdef HAVE_TR1_UNORDERED_SET
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typedef Unordered_map<const Stringpool_char*, Val, Stringpool_hash,
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Stringpool_eq,
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std::allocator<std::pair<const Stringpool_char* const,
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Val> >,
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true> String_set_type;
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#else
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typedef Unordered_map<const Stringpool_char*, Val, Stringpool_hash,
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Stringpool_eq> String_set_type;
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#endif
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// Comparison routine used when sorting into an ELF strtab.
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struct Stringpool_sort_comparison
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{
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bool
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operator()(typename String_set_type::iterator,
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typename String_set_type::iterator) const;
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};
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// List of Stringdata structures.
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typedef std::list<Stringdata*> Stringdata_list;
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// Mapping from const char* to namepool entry.
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String_set_type string_set_;
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// List of buffers.
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Stringdata_list strings_;
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// Size of ELF strtab.
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off_t strtab_size_;
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// Next Stringdata index.
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unsigned int next_index_;
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// Whether to reserve offset 0 to hold the null string.
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bool zero_null_;
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};
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// The most common type of Stringpool.
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typedef Stringpool_template<char> Stringpool;
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} // End namespace gold.
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#endif // !defined(GOLD_STRINGPOOL_H)
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