352 lines
9.9 KiB
C
352 lines
9.9 KiB
C
/* Get info from stack frames; convert between frames, blocks,
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functions and pc values.
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Copyright (C) 1986-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "symtab.h"
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#include "bfd.h"
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#include "objfiles.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "value.h"
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#include "target.h"
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#include "inferior.h"
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#include "annotate.h"
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#include "regcache.h"
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#include "dummy-frame.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "block.h"
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#include "inline-frame.h"
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/* Return the innermost lexical block in execution in a specified
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stack frame. The frame address is assumed valid.
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If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code
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address we used to choose the block. We use this to find a source
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line, to decide which macro definitions are in scope.
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The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's
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PC, and may not really be a valid PC at all. For example, in the
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caller of a function declared to never return, the code at the
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return address will never be reached, so the call instruction may
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be the very last instruction in the block. So the address we use
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to choose the block is actually one byte before the return address
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--- hopefully pointing us at the call instruction, or its delay
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slot instruction. */
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const struct block *
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get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
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{
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CORE_ADDR pc;
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const struct block *bl;
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int inline_count;
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if (!get_frame_address_in_block_if_available (frame, &pc))
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return NULL;
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if (addr_in_block)
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*addr_in_block = pc;
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bl = block_for_pc (pc);
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if (bl == NULL)
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return NULL;
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inline_count = frame_inlined_callees (frame);
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while (inline_count > 0)
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{
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if (block_inlined_p (bl))
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inline_count--;
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bl = BLOCK_SUPERBLOCK (bl);
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gdb_assert (bl != NULL);
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}
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return bl;
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}
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CORE_ADDR
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get_pc_function_start (CORE_ADDR pc)
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{
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const struct block *bl;
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struct bound_minimal_symbol msymbol;
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bl = block_for_pc (pc);
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if (bl)
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{
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struct symbol *symbol = block_linkage_function (bl);
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if (symbol)
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{
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bl = SYMBOL_BLOCK_VALUE (symbol);
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return BLOCK_START (bl);
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}
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}
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msymbol = lookup_minimal_symbol_by_pc (pc);
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if (msymbol.minsym)
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{
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CORE_ADDR fstart = BMSYMBOL_VALUE_ADDRESS (msymbol);
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if (find_pc_section (fstart))
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return fstart;
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}
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return 0;
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}
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/* Return the symbol for the function executing in frame FRAME. */
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struct symbol *
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get_frame_function (struct frame_info *frame)
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{
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const struct block *bl = get_frame_block (frame, 0);
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if (bl == NULL)
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return NULL;
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while (BLOCK_FUNCTION (bl) == NULL && BLOCK_SUPERBLOCK (bl) != NULL)
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bl = BLOCK_SUPERBLOCK (bl);
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return BLOCK_FUNCTION (bl);
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}
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/* Return the function containing pc value PC in section SECTION.
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Returns 0 if function is not known. */
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struct symbol *
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find_pc_sect_function (CORE_ADDR pc, struct obj_section *section)
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{
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const struct block *b = block_for_pc_sect (pc, section);
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if (b == 0)
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return 0;
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return block_linkage_function (b);
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}
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/* Return the function containing pc value PC.
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Returns 0 if function is not known.
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Backward compatibility, no section */
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struct symbol *
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find_pc_function (CORE_ADDR pc)
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{
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return find_pc_sect_function (pc, find_pc_mapped_section (pc));
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}
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/* These variables are used to cache the most recent result
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of find_pc_partial_function. */
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static CORE_ADDR cache_pc_function_low = 0;
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static CORE_ADDR cache_pc_function_high = 0;
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static const char *cache_pc_function_name = 0;
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static struct obj_section *cache_pc_function_section = NULL;
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static int cache_pc_function_is_gnu_ifunc = 0;
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/* Clear cache, e.g. when symbol table is discarded. */
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void
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clear_pc_function_cache (void)
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{
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cache_pc_function_low = 0;
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cache_pc_function_high = 0;
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cache_pc_function_name = (char *) 0;
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cache_pc_function_section = NULL;
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cache_pc_function_is_gnu_ifunc = 0;
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}
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/* Finds the "function" (text symbol) that is smaller than PC but
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greatest of all of the potential text symbols in SECTION. Sets
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*NAME and/or *ADDRESS conditionally if that pointer is non-null.
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If ENDADDR is non-null, then set *ENDADDR to be the end of the
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function (exclusive), but passing ENDADDR as non-null means that
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the function might cause symbols to be read. If IS_GNU_IFUNC_P is provided
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*IS_GNU_IFUNC_P is set to 1 on return if the function is STT_GNU_IFUNC.
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This function either succeeds or fails (not halfway succeeds). If it
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succeeds, it sets *NAME, *ADDRESS, and *ENDADDR to real information and
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returns 1. If it fails, it sets *NAME, *ADDRESS, *ENDADDR and
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*IS_GNU_IFUNC_P to zero and returns 0. */
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/* Backward compatibility, no section argument. */
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int
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find_pc_partial_function_gnu_ifunc (CORE_ADDR pc, const char **name,
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CORE_ADDR *address, CORE_ADDR *endaddr,
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int *is_gnu_ifunc_p)
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{
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struct obj_section *section;
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struct symbol *f;
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struct bound_minimal_symbol msymbol;
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struct compunit_symtab *compunit_symtab = NULL;
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struct objfile *objfile;
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CORE_ADDR mapped_pc;
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/* To ensure that the symbol returned belongs to the correct setion
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(and that the last [random] symbol from the previous section
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isn't returned) try to find the section containing PC. First try
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the overlay code (which by default returns NULL); and second try
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the normal section code (which almost always succeeds). */
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section = find_pc_overlay (pc);
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if (section == NULL)
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section = find_pc_section (pc);
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mapped_pc = overlay_mapped_address (pc, section);
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if (mapped_pc >= cache_pc_function_low
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&& mapped_pc < cache_pc_function_high
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&& section == cache_pc_function_section)
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goto return_cached_value;
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msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section);
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ALL_OBJFILES (objfile)
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{
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if (objfile->sf)
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{
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compunit_symtab
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= objfile->sf->qf->find_pc_sect_compunit_symtab (objfile, msymbol,
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mapped_pc, section,
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0);
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}
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if (compunit_symtab != NULL)
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break;
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}
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if (compunit_symtab != NULL)
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{
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/* Checking whether the msymbol has a larger value is for the
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"pathological" case mentioned in print_frame_info. */
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f = find_pc_sect_function (mapped_pc, section);
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if (f != NULL
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&& (msymbol.minsym == NULL
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|| (BLOCK_START (SYMBOL_BLOCK_VALUE (f))
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>= BMSYMBOL_VALUE_ADDRESS (msymbol))))
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{
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cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
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cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
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cache_pc_function_name = SYMBOL_LINKAGE_NAME (f);
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cache_pc_function_section = section;
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cache_pc_function_is_gnu_ifunc = TYPE_GNU_IFUNC (SYMBOL_TYPE (f));
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goto return_cached_value;
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}
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}
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/* Not in the normal symbol tables, see if the pc is in a known
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section. If it's not, then give up. This ensures that anything
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beyond the end of the text seg doesn't appear to be part of the
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last function in the text segment. */
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if (!section)
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msymbol.minsym = NULL;
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/* Must be in the minimal symbol table. */
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if (msymbol.minsym == NULL)
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{
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/* No available symbol. */
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if (name != NULL)
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*name = 0;
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if (address != NULL)
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*address = 0;
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if (endaddr != NULL)
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*endaddr = 0;
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if (is_gnu_ifunc_p != NULL)
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*is_gnu_ifunc_p = 0;
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return 0;
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}
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cache_pc_function_low = BMSYMBOL_VALUE_ADDRESS (msymbol);
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cache_pc_function_name = MSYMBOL_LINKAGE_NAME (msymbol.minsym);
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cache_pc_function_section = section;
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cache_pc_function_is_gnu_ifunc = (MSYMBOL_TYPE (msymbol.minsym)
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== mst_text_gnu_ifunc);
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cache_pc_function_high = minimal_symbol_upper_bound (msymbol);
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return_cached_value:
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if (address)
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{
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if (pc_in_unmapped_range (pc, section))
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*address = overlay_unmapped_address (cache_pc_function_low, section);
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else
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*address = cache_pc_function_low;
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}
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if (name)
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*name = cache_pc_function_name;
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if (endaddr)
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{
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if (pc_in_unmapped_range (pc, section))
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{
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/* Because the high address is actually beyond the end of
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the function (and therefore possibly beyond the end of
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the overlay), we must actually convert (high - 1) and
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then add one to that. */
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*endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1,
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section);
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}
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else
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*endaddr = cache_pc_function_high;
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}
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if (is_gnu_ifunc_p)
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*is_gnu_ifunc_p = cache_pc_function_is_gnu_ifunc;
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return 1;
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}
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/* See find_pc_partial_function_gnu_ifunc, only the IS_GNU_IFUNC_P parameter
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is omitted here for backward API compatibility. */
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int
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find_pc_partial_function (CORE_ADDR pc, const char **name, CORE_ADDR *address,
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CORE_ADDR *endaddr)
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{
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return find_pc_partial_function_gnu_ifunc (pc, name, address, endaddr, NULL);
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}
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/* Return the innermost stack frame that is executing inside of BLOCK and is
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at least as old as the selected frame. Return NULL if there is no
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such frame. If BLOCK is NULL, just return NULL. */
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struct frame_info *
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block_innermost_frame (const struct block *block)
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{
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struct frame_info *frame;
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if (block == NULL)
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return NULL;
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frame = get_selected_frame_if_set ();
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if (frame == NULL)
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frame = get_current_frame ();
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while (frame != NULL)
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{
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const struct block *frame_block = get_frame_block (frame, NULL);
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if (frame_block != NULL && contained_in (frame_block, block))
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return frame;
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frame = get_prev_frame (frame);
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}
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return NULL;
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}
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