// dwarf_reader.h -- parse dwarf2/3 debug information for gold -*- C++ -*-
-// Copyright 2007 Free Software Foundation, Inc.
+// Copyright 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
class Track_relocs;
struct LineStateMachine;
+uint64_t
+read_unsigned_LEB_128(const unsigned char* buffer, size_t* len);
+
+int64_t
+read_signed_LEB_128(const unsigned char* buffer, size_t* len);
+
// We can't do better than to keep the offsets in a sorted vector.
// Here, offset is the key, and file_num/line_num is the value.
struct Offset_to_lineno_entry
addr2line(unsigned int shndx, off_t offset)
{ return do_addr2line(shndx, offset); }
- // A helper function for a single addr2line lookup. It uses
- // parameters() to figure out the size and endianness. This is less
- // efficient than using the templatized size and endianness, so only
- // call this from an un-templatized context.
+ // A helper function for a single addr2line lookup. It also keeps a
+ // cache of the last CACHE_SIZE Dwarf_line_info objects it created;
+ // set to 0 not to cache at all. The larger CACHE_SIZE is, the more
+ // chance this routine won't have to re-create a Dwarf_line_info
+ // object for its addr2line computation; such creations are slow.
+ // NOTE: Not thread-safe, so only call from one thread at a time.
static std::string
- one_addr2line(Object* object, unsigned int shndx, off_t offset);
+ one_addr2line(Object* object, unsigned int shndx, off_t offset,
+ size_t cache_size);
+
+ // This reclaims all the memory that one_addr2line may have cached.
+ // Use this when you know you will not be calling one_addr2line again.
+ static void
+ clear_addr2line_cache();
private:
virtual std::string
{
public:
// Initializes a .debug_line reader for a given object file.
- Sized_dwarf_line_info(Object* object);
+ // If SHNDX is specified and non-negative, only read the debug
+ // information that pertains to the specified section.
+ Sized_dwarf_line_info(Object* object, off_t read_shndx = -1U);
private:
std::string
do_addr2line(unsigned int shndx, off_t offset);
// Start processing line info, and populates the offset_map_.
+ // If SHNDX is non-negative, only store debug information that
+ // pertains to the specified section.
void
- read_line_mappings();
+ read_line_mappings(Object*, off_t shndx);
// Reads the relocation section associated with .debug_line and
// stores relocation information in reloc_map_.
void
- read_relocs();
+ read_relocs(Object*);
// Looks in the symtab to see what section a symbol is in.
unsigned int
- symbol_section(unsigned int sym,
- typename elfcpp::Elf_types<size>::Elf_Addr* value);
+ symbol_section(Object*, unsigned int sym,
+ typename elfcpp::Elf_types<size>::Elf_Addr* value,
+ bool* is_ordinary);
// Reads the DWARF2/3 header for this line info. Each takes as input
// a starting buffer position, and returns the ending position.
const unsigned char*
read_header_tables(const unsigned char* lineptr);
- // Reads the DWARF2/3 line information.
+ // Reads the DWARF2/3 line information. If shndx is non-negative,
+ // discard all line information that doesn't pertain to the given
+ // section.
const unsigned char*
- read_lines(const unsigned char* lineptr);
+ read_lines(const unsigned char* lineptr, off_t shndx);
// Process a single line info opcode at START using the state
// machine at LSM. Return true if we should define a line using the
// This is used to figure out what section to apply a relocation to.
const unsigned char* symtab_buffer_;
- off_t symtab_buffer_size_;
+ section_size_type symtab_buffer_size_;
// Holds the directories and files as we see them. We have an array
// of directory-lists, one for each .o file we're reading (usually