David Mosberger <davidm@hpl.hp.com>
* dwarf2.c (struct arange): New type.
(struct comp_unit): Replace LOW and HIGH by member ARANGE.
(arange_add): New function.
(decode_line_info): Keep track of address ranges that a compilation
unit covers.
(comp_unit_contains_address): Return true if address is contained
in _any_ of the address ranges associated with a compilation unit.
(_bfd_dwarf2_find_nearest_line): Call comp_unit_find_nearest_line
on the first comp_unit that contains the address.
This commit is contained in:
Richard Henderson
parent
69dd2e2d55
commit
f623be2b68
@ -1,3 +1,15 @@
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1999-06-26 David Mosberger <davidm@hpl.hp.com>
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* dwarf2.c (struct arange): New type.
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(struct comp_unit): Replace LOW and HIGH by member ARANGE.
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(arange_add): New function.
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(decode_line_info): Keep track of address ranges that a compilation
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unit covers.
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(comp_unit_contains_address): Return true if address is contained
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in _any_ of the address ranges associated with a compilation unit.
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(_bfd_dwarf2_find_nearest_line): Call comp_unit_find_nearest_line
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on the first comp_unit that contains the address.
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1999-06-26 David Mosberger <davidm@hpl.hp.com>
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* dwarf2.c (struct dwarf2_debug): Add member dwarf_line_buffer.
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147
bfd/dwarf2.c
147
bfd/dwarf2.c
@ -104,6 +104,11 @@ struct dwarf2_debug {
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char *dwarf_line_buffer;
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};
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struct arange {
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struct arange *next;
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bfd_vma low;
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bfd_vma high;
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};
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/* A minimal decoding of DWARF2 compilation units. We only decode
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@ -119,8 +124,7 @@ struct comp_unit {
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/* The lowest and higest addresses contained in this compilation
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unit as specified in the compilation unit header. */
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bfd_vma low;
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bfd_vma high;
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struct arange arange;
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/* The DW_AT_name attribute (for error messages). */
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char* name;
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@ -705,6 +709,50 @@ concat_filename (table, file)
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}
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}
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static void
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arange_add (unit, low_pc, high_pc)
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struct comp_unit *unit;
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bfd_vma low_pc;
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bfd_vma high_pc;
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{
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struct arange *arange;
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/* first see if we can cheaply extend an existing range: */
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arange = &unit->arange;
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do
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{
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if (low_pc == arange->high)
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{
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arange->high = high_pc;
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return;
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}
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if (high_pc == arange->low)
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{
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arange->low = low_pc;
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return;
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}
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arange = arange->next;
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}
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while (arange);
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if (unit->arange.high == 0)
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{
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/* this is the first address range: store it in unit->arange: */
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unit->arange.next = 0;
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unit->arange.low = low_pc;
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unit->arange.high = high_pc;
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return;
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}
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/* need to allocate a new arange and insert it into the arange list: */
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arange = bfd_zalloc (unit->abfd, sizeof (*arange));
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arange->low = low_pc;
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arange->high = high_pc;
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arange->next = unit->arange.next;
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unit->arange.next = arange;
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}
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/* Decode the line number information for UNIT. */
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static struct line_info_table*
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@ -723,12 +771,6 @@ decode_line_info (unit)
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unsigned int i, bytes_read;
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char *cur_file, *cur_dir;
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unsigned char op_code, extended_op, adj_opcode;
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#if 0
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/* This optimization unfortunately does not work well on programs
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that have multiple sections containing text (such as Linux which
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uses .text, and .text.init, for example. */
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bfd_vma hi_pc = 0, lo_pc = ~ (bfd_vma) 0;
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#endif
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stash = elf_tdata (abfd)->dwarf2_find_line_info;
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@ -747,11 +789,11 @@ decode_line_info (unit)
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size = bfd_get_section_size_before_reloc (msec);
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stash->dwarf_line_buffer = (char *) bfd_alloc (abfd, size);
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if (! dwarf_line_buffer)
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if (! stash->dwarf_line_buffer)
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return 0;
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if (! bfd_get_section_contents (abfd, msec,
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dwarf_line_buffer, 0,
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stash->dwarf_line_buffer, 0,
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size))
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return 0;
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@ -856,7 +898,8 @@ decode_line_info (unit)
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unsigned int column = 0;
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int is_stmt = lh.default_is_stmt;
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int basic_block = 0;
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int end_sequence = 0;
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int end_sequence = 0, need_low_pc = 1;
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bfd_vma low_pc = 0;
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/* Decode the table. */
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while (! end_sequence)
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@ -873,7 +916,14 @@ decode_line_info (unit)
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{
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case DW_LNE_end_sequence:
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end_sequence = 1;
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add_line_info (table, address, filename, line, column, end_sequence);
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add_line_info (table, address, filename, line, column,
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end_sequence);
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if (need_low_pc)
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{
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need_low_pc = 0;
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low_pc = address;
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}
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arange_add (unit, low_pc, address);
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break;
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case DW_LNE_set_address:
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address = read_address (unit, line_ptr);
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@ -912,6 +962,11 @@ decode_line_info (unit)
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case DW_LNS_copy:
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add_line_info (table, address, filename, line, column, 0);
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basic_block = 0;
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if (need_low_pc)
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{
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need_low_pc = 0;
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low_pc = address;
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}
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break;
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case DW_LNS_advance_pc:
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address += lh.minimum_instruction_length
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@ -959,25 +1014,14 @@ decode_line_info (unit)
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/* append row to matrix using current values */
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add_line_info (table, address, filename, line, column, 0);
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basic_block = 1;
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if (need_low_pc)
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{
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need_low_pc = 0;
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low_pc = address;
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}
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}
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#if 0
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if (unit->high == 0)
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{
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if (address > hi_pc)
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hi_pc = address;
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if (address < lo_pc)
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lo_pc = address;
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}
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#endif
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}
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}
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#if 0
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if (unit->high == 0 && hi_pc != 0)
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{
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unit->high = hi_pc;
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unit->low = lo_pc;
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}
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#endif
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return table;
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}
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@ -1275,11 +1319,11 @@ parse_comp_unit (abfd, info_ptr, end_ptr)
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break;
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case DW_AT_low_pc:
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unit->low = DW_ADDR (&attr);
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unit->arange.low = DW_ADDR (&attr);
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break;
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case DW_AT_high_pc:
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unit->high = DW_ADDR (&attr);
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unit->arange.high = DW_ADDR (&attr);
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break;
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case DW_AT_comp_dir:
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@ -1318,8 +1362,20 @@ comp_unit_contains_address (unit, addr)
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struct comp_unit* unit;
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bfd_vma addr;
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{
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return ! unit->error
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&& (addr >= unit->low && addr <= unit->high);
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struct arange *arange;
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if (unit->error)
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return 0;
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arange = &unit->arange;
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do
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{
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if (addr >= arange->low && addr < arange->high)
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return 1;
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arange = arange->next;
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}
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while (arange);
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return 0;
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}
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@ -1410,8 +1466,6 @@ _bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
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struct comp_unit* each;
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boolean found;
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*filename_ptr = NULL;
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*functionname_ptr = NULL;
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*linenumber_ptr = 0;
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@ -1478,31 +1532,16 @@ _bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
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/* Check the previously read comp. units first. */
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for (each = stash->all_comp_units; each; each = each->next_unit)
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{
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if (each->high > 0)
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{
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if (comp_unit_contains_address (each, addr))
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return comp_unit_find_nearest_line (each, addr,
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filename_ptr,
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functionname_ptr,
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linenumber_ptr);
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}
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else
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{
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found = comp_unit_find_nearest_line (each, addr,
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filename_ptr,
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functionname_ptr,
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linenumber_ptr);
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if (found)
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return true;
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}
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}
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if (comp_unit_contains_address (each, addr))
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return comp_unit_find_nearest_line (each, addr, filename_ptr,
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functionname_ptr, linenumber_ptr);
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/* Read each remaining comp. units checking each as they are read. */
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while (stash->info_ptr < stash->info_ptr_end)
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{
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struct comp_unit* each;
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unsigned int length;
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boolean found;
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length = read_4_bytes (abfd, stash->info_ptr);
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stash->info_ptr += 4;
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@ -1523,7 +1562,7 @@ _bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
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unit->high == 0), we need to consult the line info
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table to see if a compilation unit contains the given
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address. */
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if (each->high > 0)
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if (each->arange.high > 0)
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{
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if (comp_unit_contains_address (each, addr))
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return comp_unit_find_nearest_line (each, addr,
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