774 lines
20 KiB
C
774 lines
20 KiB
C
/* Block-related functions for the GNU debugger, GDB.
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Copyright (C) 2003-2014 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 "block.h"
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#include "symtab.h"
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#include "symfile.h"
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#include "gdb_obstack.h"
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#include "cp-support.h"
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#include "addrmap.h"
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#include "gdbtypes.h"
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/* This is used by struct block to store namespace-related info for
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C++ files, namely using declarations and the current namespace in
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scope. */
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struct block_namespace_info
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{
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const char *scope;
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struct using_direct *using;
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};
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static void block_initialize_namespace (struct block *block,
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struct obstack *obstack);
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/* Return Nonzero if block a is lexically nested within block b,
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or if a and b have the same pc range.
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Return zero otherwise. */
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int
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contained_in (const struct block *a, const struct block *b)
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{
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if (!a || !b)
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return 0;
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do
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{
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if (a == b)
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return 1;
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/* If A is a function block, then A cannot be contained in B,
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except if A was inlined. */
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if (BLOCK_FUNCTION (a) != NULL && !block_inlined_p (a))
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return 0;
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a = BLOCK_SUPERBLOCK (a);
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}
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while (a != NULL);
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return 0;
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}
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/* Return the symbol for the function which contains a specified
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lexical block, described by a struct block BL. The return value
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will not be an inlined function; the containing function will be
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returned instead. */
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struct symbol *
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block_linkage_function (const struct block *bl)
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{
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while ((BLOCK_FUNCTION (bl) == NULL || block_inlined_p (bl))
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&& 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 symbol for the function which contains a specified
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block, described by a struct block BL. The return value will be
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the closest enclosing function, which might be an inline
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function. */
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struct symbol *
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block_containing_function (const struct block *bl)
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{
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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 one if BL represents an inlined function. */
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int
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block_inlined_p (const struct block *bl)
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{
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return BLOCK_FUNCTION (bl) != NULL && SYMBOL_INLINED (BLOCK_FUNCTION (bl));
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}
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/* A helper function that checks whether PC is in the blockvector BL.
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It returns the containing block if there is one, or else NULL. */
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static struct block *
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find_block_in_blockvector (const struct blockvector *bl, CORE_ADDR pc)
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{
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struct block *b;
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int bot, top, half;
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/* If we have an addrmap mapping code addresses to blocks, then use
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that. */
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if (BLOCKVECTOR_MAP (bl))
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return addrmap_find (BLOCKVECTOR_MAP (bl), pc);
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/* Otherwise, use binary search to find the last block that starts
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before PC.
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Note: GLOBAL_BLOCK is block 0, STATIC_BLOCK is block 1.
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They both have the same START,END values.
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Historically this code would choose STATIC_BLOCK over GLOBAL_BLOCK but the
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fact that this choice was made was subtle, now we make it explicit. */
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gdb_assert (BLOCKVECTOR_NBLOCKS (bl) >= 2);
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bot = STATIC_BLOCK;
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top = BLOCKVECTOR_NBLOCKS (bl);
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while (top - bot > 1)
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{
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half = (top - bot + 1) >> 1;
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b = BLOCKVECTOR_BLOCK (bl, bot + half);
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if (BLOCK_START (b) <= pc)
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bot += half;
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else
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top = bot + half;
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}
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/* Now search backward for a block that ends after PC. */
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while (bot >= STATIC_BLOCK)
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{
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b = BLOCKVECTOR_BLOCK (bl, bot);
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if (BLOCK_END (b) > pc)
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return b;
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bot--;
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}
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return NULL;
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}
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/* Return the blockvector immediately containing the innermost lexical
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block containing the specified pc value and section, or 0 if there
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is none. PBLOCK is a pointer to the block. If PBLOCK is NULL, we
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don't pass this information back to the caller. */
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const struct blockvector *
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blockvector_for_pc_sect (CORE_ADDR pc, struct obj_section *section,
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const struct block **pblock,
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struct compunit_symtab *cust)
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{
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const struct blockvector *bl;
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struct block *b;
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if (cust == NULL)
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{
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/* First search all symtabs for one whose file contains our pc */
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cust = find_pc_sect_compunit_symtab (pc, section);
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if (cust == NULL)
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return 0;
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}
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bl = COMPUNIT_BLOCKVECTOR (cust);
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/* Then search that symtab for the smallest block that wins. */
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b = find_block_in_blockvector (bl, pc);
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if (b == NULL)
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return NULL;
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if (pblock)
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*pblock = b;
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return bl;
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}
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/* Return true if the blockvector BV contains PC, false otherwise. */
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int
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blockvector_contains_pc (const struct blockvector *bv, CORE_ADDR pc)
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{
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return find_block_in_blockvector (bv, pc) != NULL;
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}
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/* Return call_site for specified PC in GDBARCH. PC must match exactly, it
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must be the next instruction after call (or after tail call jump). Throw
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NO_ENTRY_VALUE_ERROR otherwise. This function never returns NULL. */
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struct call_site *
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call_site_for_pc (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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struct compunit_symtab *cust;
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void **slot = NULL;
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/* -1 as tail call PC can be already after the compilation unit range. */
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cust = find_pc_compunit_symtab (pc - 1);
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if (cust != NULL && COMPUNIT_CALL_SITE_HTAB (cust) != NULL)
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slot = htab_find_slot (COMPUNIT_CALL_SITE_HTAB (cust), &pc, NO_INSERT);
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if (slot == NULL)
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{
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struct bound_minimal_symbol msym = lookup_minimal_symbol_by_pc (pc);
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/* DW_TAG_gnu_call_site will be missing just if GCC could not determine
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the call target. */
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throw_error (NO_ENTRY_VALUE_ERROR,
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_("DW_OP_GNU_entry_value resolving cannot find "
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"DW_TAG_GNU_call_site %s in %s"),
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paddress (gdbarch, pc),
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(msym.minsym == NULL ? "???"
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: MSYMBOL_PRINT_NAME (msym.minsym)));
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}
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return *slot;
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}
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/* Return the blockvector immediately containing the innermost lexical block
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containing the specified pc value, or 0 if there is none.
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Backward compatibility, no section. */
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const struct blockvector *
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blockvector_for_pc (CORE_ADDR pc, const struct block **pblock)
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{
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return blockvector_for_pc_sect (pc, find_pc_mapped_section (pc),
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pblock, NULL);
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}
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/* Return the innermost lexical block containing the specified pc value
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in the specified section, or 0 if there is none. */
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const struct block *
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block_for_pc_sect (CORE_ADDR pc, struct obj_section *section)
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{
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const struct blockvector *bl;
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const struct block *b;
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bl = blockvector_for_pc_sect (pc, section, &b, NULL);
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if (bl)
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return b;
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return 0;
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}
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/* Return the innermost lexical block containing the specified pc value,
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or 0 if there is none. Backward compatibility, no section. */
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const struct block *
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block_for_pc (CORE_ADDR pc)
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{
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return block_for_pc_sect (pc, find_pc_mapped_section (pc));
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}
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/* Now come some functions designed to deal with C++ namespace issues.
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The accessors are safe to use even in the non-C++ case. */
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/* This returns the namespace that BLOCK is enclosed in, or "" if it
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isn't enclosed in a namespace at all. This travels the chain of
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superblocks looking for a scope, if necessary. */
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const char *
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block_scope (const struct block *block)
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{
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for (; block != NULL; block = BLOCK_SUPERBLOCK (block))
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{
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if (BLOCK_NAMESPACE (block) != NULL
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&& BLOCK_NAMESPACE (block)->scope != NULL)
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return BLOCK_NAMESPACE (block)->scope;
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}
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return "";
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}
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/* Set BLOCK's scope member to SCOPE; if needed, allocate memory via
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OBSTACK. (It won't make a copy of SCOPE, however, so that already
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has to be allocated correctly.) */
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void
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block_set_scope (struct block *block, const char *scope,
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struct obstack *obstack)
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{
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block_initialize_namespace (block, obstack);
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BLOCK_NAMESPACE (block)->scope = scope;
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}
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/* This returns the using directives list associated with BLOCK, if
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any. */
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struct using_direct *
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block_using (const struct block *block)
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{
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if (block == NULL || BLOCK_NAMESPACE (block) == NULL)
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return NULL;
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else
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return BLOCK_NAMESPACE (block)->using;
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}
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/* Set BLOCK's using member to USING; if needed, allocate memory via
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OBSTACK. (It won't make a copy of USING, however, so that already
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has to be allocated correctly.) */
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void
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block_set_using (struct block *block,
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struct using_direct *using,
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struct obstack *obstack)
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{
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block_initialize_namespace (block, obstack);
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BLOCK_NAMESPACE (block)->using = using;
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}
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/* If BLOCK_NAMESPACE (block) is NULL, allocate it via OBSTACK and
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ititialize its members to zero. */
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static void
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block_initialize_namespace (struct block *block, struct obstack *obstack)
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{
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if (BLOCK_NAMESPACE (block) == NULL)
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{
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BLOCK_NAMESPACE (block)
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= obstack_alloc (obstack, sizeof (struct block_namespace_info));
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BLOCK_NAMESPACE (block)->scope = NULL;
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BLOCK_NAMESPACE (block)->using = NULL;
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}
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}
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/* Return the static block associated to BLOCK. Return NULL if block
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is NULL or if block is a global block. */
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const struct block *
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block_static_block (const struct block *block)
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{
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if (block == NULL || BLOCK_SUPERBLOCK (block) == NULL)
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return NULL;
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while (BLOCK_SUPERBLOCK (BLOCK_SUPERBLOCK (block)) != NULL)
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block = BLOCK_SUPERBLOCK (block);
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return block;
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}
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/* Return the static block associated to BLOCK. Return NULL if block
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is NULL. */
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const struct block *
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block_global_block (const struct block *block)
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{
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if (block == NULL)
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return NULL;
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while (BLOCK_SUPERBLOCK (block) != NULL)
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block = BLOCK_SUPERBLOCK (block);
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return block;
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}
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/* Allocate a block on OBSTACK, and initialize its elements to
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zero/NULL. This is useful for creating "dummy" blocks that don't
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correspond to actual source files.
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Warning: it sets the block's BLOCK_DICT to NULL, which isn't a
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valid value. If you really don't want the block to have a
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dictionary, then you should subsequently set its BLOCK_DICT to
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dict_create_linear (obstack, NULL). */
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struct block *
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allocate_block (struct obstack *obstack)
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{
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struct block *bl = OBSTACK_ZALLOC (obstack, struct block);
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return bl;
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}
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/* Allocate a global block. */
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struct block *
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allocate_global_block (struct obstack *obstack)
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{
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struct global_block *bl = OBSTACK_ZALLOC (obstack, struct global_block);
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return &bl->block;
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}
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/* Set the compunit of the global block. */
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void
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set_block_compunit_symtab (struct block *block, struct compunit_symtab *cu)
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{
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struct global_block *gb;
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gdb_assert (BLOCK_SUPERBLOCK (block) == NULL);
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gb = (struct global_block *) block;
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gdb_assert (gb->compunit_symtab == NULL);
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gb->compunit_symtab = cu;
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}
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/* Return the compunit of the global block. */
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static struct compunit_symtab *
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get_block_compunit_symtab (const struct block *block)
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{
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struct global_block *gb;
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gdb_assert (BLOCK_SUPERBLOCK (block) == NULL);
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gb = (struct global_block *) block;
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gdb_assert (gb->compunit_symtab != NULL);
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return gb->compunit_symtab;
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}
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/* Initialize a block iterator, either to iterate over a single block,
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or, for static and global blocks, all the included symtabs as
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well. */
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static void
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initialize_block_iterator (const struct block *block,
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struct block_iterator *iter)
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{
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enum block_enum which;
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struct compunit_symtab *cu;
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iter->idx = -1;
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if (BLOCK_SUPERBLOCK (block) == NULL)
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{
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which = GLOBAL_BLOCK;
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cu = get_block_compunit_symtab (block);
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}
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else if (BLOCK_SUPERBLOCK (BLOCK_SUPERBLOCK (block)) == NULL)
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{
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which = STATIC_BLOCK;
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cu = get_block_compunit_symtab (BLOCK_SUPERBLOCK (block));
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}
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else
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{
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iter->d.block = block;
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/* A signal value meaning that we're iterating over a single
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block. */
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iter->which = FIRST_LOCAL_BLOCK;
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return;
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}
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/* If this is an included symtab, find the canonical includer and
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use it instead. */
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while (cu->user != NULL)
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cu = cu->user;
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/* Putting this check here simplifies the logic of the iterator
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functions. If there are no included symtabs, we only need to
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search a single block, so we might as well just do that
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directly. */
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if (cu->includes == NULL)
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{
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iter->d.block = block;
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/* A signal value meaning that we're iterating over a single
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block. */
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iter->which = FIRST_LOCAL_BLOCK;
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}
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else
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{
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iter->d.compunit_symtab = cu;
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iter->which = which;
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}
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}
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/* A helper function that finds the current compunit over whose static
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or global block we should iterate. */
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static struct compunit_symtab *
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find_iterator_compunit_symtab (struct block_iterator *iterator)
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{
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if (iterator->idx == -1)
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return iterator->d.compunit_symtab;
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return iterator->d.compunit_symtab->includes[iterator->idx];
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}
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/* Perform a single step for a plain block iterator, iterating across
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symbol tables as needed. Returns the next symbol, or NULL when
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iteration is complete. */
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static struct symbol *
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block_iterator_step (struct block_iterator *iterator, int first)
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{
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struct symbol *sym;
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gdb_assert (iterator->which != FIRST_LOCAL_BLOCK);
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while (1)
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{
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if (first)
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{
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struct compunit_symtab *cust
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= find_iterator_compunit_symtab (iterator);
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const struct block *block;
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/* Iteration is complete. */
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if (cust == NULL)
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return NULL;
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block = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (cust),
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iterator->which);
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sym = dict_iterator_first (BLOCK_DICT (block), &iterator->dict_iter);
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}
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else
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sym = dict_iterator_next (&iterator->dict_iter);
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if (sym != NULL)
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return sym;
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/* We have finished iterating the appropriate block of one
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symtab. Now advance to the next symtab and begin iteration
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there. */
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++iterator->idx;
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first = 1;
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}
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}
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/* See block.h. */
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struct symbol *
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block_iterator_first (const struct block *block,
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struct block_iterator *iterator)
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{
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initialize_block_iterator (block, iterator);
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if (iterator->which == FIRST_LOCAL_BLOCK)
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return dict_iterator_first (block->dict, &iterator->dict_iter);
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return block_iterator_step (iterator, 1);
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}
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/* See block.h. */
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struct symbol *
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block_iterator_next (struct block_iterator *iterator)
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{
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if (iterator->which == FIRST_LOCAL_BLOCK)
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return dict_iterator_next (&iterator->dict_iter);
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return block_iterator_step (iterator, 0);
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}
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/* Perform a single step for a "name" block iterator, iterating across
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symbol tables as needed. Returns the next symbol, or NULL when
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iteration is complete. */
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static struct symbol *
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block_iter_name_step (struct block_iterator *iterator, const char *name,
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int first)
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{
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struct symbol *sym;
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gdb_assert (iterator->which != FIRST_LOCAL_BLOCK);
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while (1)
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{
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if (first)
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{
|
||
struct compunit_symtab *cust
|
||
= find_iterator_compunit_symtab (iterator);
|
||
const struct block *block;
|
||
|
||
/* Iteration is complete. */
|
||
if (cust == NULL)
|
||
return NULL;
|
||
|
||
block = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (cust),
|
||
iterator->which);
|
||
sym = dict_iter_name_first (BLOCK_DICT (block), name,
|
||
&iterator->dict_iter);
|
||
}
|
||
else
|
||
sym = dict_iter_name_next (name, &iterator->dict_iter);
|
||
|
||
if (sym != NULL)
|
||
return sym;
|
||
|
||
/* We have finished iterating the appropriate block of one
|
||
symtab. Now advance to the next symtab and begin iteration
|
||
there. */
|
||
++iterator->idx;
|
||
first = 1;
|
||
}
|
||
}
|
||
|
||
/* See block.h. */
|
||
|
||
struct symbol *
|
||
block_iter_name_first (const struct block *block,
|
||
const char *name,
|
||
struct block_iterator *iterator)
|
||
{
|
||
initialize_block_iterator (block, iterator);
|
||
|
||
if (iterator->which == FIRST_LOCAL_BLOCK)
|
||
return dict_iter_name_first (block->dict, name, &iterator->dict_iter);
|
||
|
||
return block_iter_name_step (iterator, name, 1);
|
||
}
|
||
|
||
/* See block.h. */
|
||
|
||
struct symbol *
|
||
block_iter_name_next (const char *name, struct block_iterator *iterator)
|
||
{
|
||
if (iterator->which == FIRST_LOCAL_BLOCK)
|
||
return dict_iter_name_next (name, &iterator->dict_iter);
|
||
|
||
return block_iter_name_step (iterator, name, 0);
|
||
}
|
||
|
||
/* Perform a single step for a "match" block iterator, iterating
|
||
across symbol tables as needed. Returns the next symbol, or NULL
|
||
when iteration is complete. */
|
||
|
||
static struct symbol *
|
||
block_iter_match_step (struct block_iterator *iterator,
|
||
const char *name,
|
||
symbol_compare_ftype *compare,
|
||
int first)
|
||
{
|
||
struct symbol *sym;
|
||
|
||
gdb_assert (iterator->which != FIRST_LOCAL_BLOCK);
|
||
|
||
while (1)
|
||
{
|
||
if (first)
|
||
{
|
||
struct compunit_symtab *cust
|
||
= find_iterator_compunit_symtab (iterator);
|
||
const struct block *block;
|
||
|
||
/* Iteration is complete. */
|
||
if (cust == NULL)
|
||
return NULL;
|
||
|
||
block = BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (cust),
|
||
iterator->which);
|
||
sym = dict_iter_match_first (BLOCK_DICT (block), name,
|
||
compare, &iterator->dict_iter);
|
||
}
|
||
else
|
||
sym = dict_iter_match_next (name, compare, &iterator->dict_iter);
|
||
|
||
if (sym != NULL)
|
||
return sym;
|
||
|
||
/* We have finished iterating the appropriate block of one
|
||
symtab. Now advance to the next symtab and begin iteration
|
||
there. */
|
||
++iterator->idx;
|
||
first = 1;
|
||
}
|
||
}
|
||
|
||
/* See block.h. */
|
||
|
||
struct symbol *
|
||
block_iter_match_first (const struct block *block,
|
||
const char *name,
|
||
symbol_compare_ftype *compare,
|
||
struct block_iterator *iterator)
|
||
{
|
||
initialize_block_iterator (block, iterator);
|
||
|
||
if (iterator->which == FIRST_LOCAL_BLOCK)
|
||
return dict_iter_match_first (block->dict, name, compare,
|
||
&iterator->dict_iter);
|
||
|
||
return block_iter_match_step (iterator, name, compare, 1);
|
||
}
|
||
|
||
/* See block.h. */
|
||
|
||
struct symbol *
|
||
block_iter_match_next (const char *name,
|
||
symbol_compare_ftype *compare,
|
||
struct block_iterator *iterator)
|
||
{
|
||
if (iterator->which == FIRST_LOCAL_BLOCK)
|
||
return dict_iter_match_next (name, compare, &iterator->dict_iter);
|
||
|
||
return block_iter_match_step (iterator, name, compare, 0);
|
||
}
|
||
|
||
/* See block.h.
|
||
|
||
Note that if NAME is the demangled form of a C++ symbol, we will fail
|
||
to find a match during the binary search of the non-encoded names, but
|
||
for now we don't worry about the slight inefficiency of looking for
|
||
a match we'll never find, since it will go pretty quick. Once the
|
||
binary search terminates, we drop through and do a straight linear
|
||
search on the symbols. Each symbol which is marked as being a ObjC/C++
|
||
symbol (language_cplus or language_objc set) has both the encoded and
|
||
non-encoded names tested for a match. */
|
||
|
||
struct symbol *
|
||
block_lookup_symbol (const struct block *block, const char *name,
|
||
const domain_enum domain)
|
||
{
|
||
struct block_iterator iter;
|
||
struct symbol *sym;
|
||
|
||
if (!BLOCK_FUNCTION (block))
|
||
{
|
||
ALL_BLOCK_SYMBOLS_WITH_NAME (block, name, iter, sym)
|
||
{
|
||
if (symbol_matches_domain (SYMBOL_LANGUAGE (sym),
|
||
SYMBOL_DOMAIN (sym), domain))
|
||
return sym;
|
||
}
|
||
return NULL;
|
||
}
|
||
else
|
||
{
|
||
/* Note that parameter symbols do not always show up last in the
|
||
list; this loop makes sure to take anything else other than
|
||
parameter symbols first; it only uses parameter symbols as a
|
||
last resort. Note that this only takes up extra computation
|
||
time on a match. */
|
||
|
||
struct symbol *sym_found = NULL;
|
||
|
||
ALL_BLOCK_SYMBOLS_WITH_NAME (block, name, iter, sym)
|
||
{
|
||
if (symbol_matches_domain (SYMBOL_LANGUAGE (sym),
|
||
SYMBOL_DOMAIN (sym), domain))
|
||
{
|
||
sym_found = sym;
|
||
if (!SYMBOL_IS_ARGUMENT (sym))
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
return (sym_found); /* Will be NULL if not found. */
|
||
}
|
||
}
|
||
|
||
/* See block.h. */
|
||
|
||
struct symbol *
|
||
block_lookup_symbol_primary (const struct block *block, const char *name,
|
||
const domain_enum domain)
|
||
{
|
||
struct symbol *sym;
|
||
struct dict_iterator dict_iter;
|
||
|
||
/* Verify BLOCK is STATIC_BLOCK or GLOBAL_BLOCK. */
|
||
gdb_assert (BLOCK_SUPERBLOCK (block) == NULL
|
||
|| BLOCK_SUPERBLOCK (BLOCK_SUPERBLOCK (block)) == NULL);
|
||
|
||
for (sym = dict_iter_name_first (block->dict, name, &dict_iter);
|
||
sym != NULL;
|
||
sym = dict_iter_name_next (name, &dict_iter))
|
||
{
|
||
if (symbol_matches_domain (SYMBOL_LANGUAGE (sym),
|
||
SYMBOL_DOMAIN (sym), domain))
|
||
return sym;
|
||
}
|
||
|
||
return NULL;
|
||
}
|