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8e3b41a906
Implement basic support for DW_TAG_GNU_call_site. * block.c: Include gdbtypes.h and exceptions.h. (call_site_for_pc): New function. * block.h (call_site_for_pc): New declaration. * defs.h: Include hashtab.h. (make_cleanup_htab_delete, core_addr_hash, core_addr_eq): New declarations. * dwarf2-frame.c (dwarf2_frame_ctx_funcs): Install ctx_no_push_dwarf_reg_entry_value. * dwarf2expr.c (read_uleb128, read_sleb128): Support R as NULL. (dwarf_block_to_dwarf_reg): New function. (execute_stack_op) <DW_OP_GNU_entry_value>: Implement it. (ctx_no_push_dwarf_reg_entry_value): New function. * dwarf2expr.h (struct dwarf_expr_context_funcs): New field push_dwarf_reg_entry_value. (ctx_no_push_dwarf_reg_entry_value, dwarf_block_to_dwarf_reg): New declarations. * dwarf2loc.c: Include gdbcmd.h. (dwarf_expr_ctx_funcs): New forward declaration. (entry_values_debug, show_entry_values_debug, call_site_to_target_addr) (dwarf_expr_reg_to_entry_parameter) (dwarf_expr_push_dwarf_reg_entry_value): New. (dwarf_expr_ctx_funcs): Install dwarf_expr_push_dwarf_reg_entry_value. (dwarf2_evaluate_loc_desc_full): Handle NO_ENTRY_VALUE_ERROR. (needs_dwarf_reg_entry_value): New function. (needs_frame_ctx_funcs): Install it. (_initialize_dwarf2loc): New function. * dwarf2loc.h (entry_values_debug): New declaration. * dwarf2read.c (struct dwarf2_cu): New field call_site_htab. (read_call_site_scope): New forward declaration. (process_full_comp_unit): Copy call_site_htab. (process_die): Support DW_TAG_GNU_call_site. (read_call_site_scope): New function. (dwarf2_get_pc_bounds): Support NULL HIGHPC. (dwarf_tag_name): Support DW_TAG_GNU_call_site. (cleanup_htab): Delete. (write_psymtabs_to_index): Use make_cleanup_htab_delete instead of it. * exceptions.h (enum errors): New NO_ENTRY_VALUE_ERROR. * gdb-gdb.py (StructMainTypePrettyPrinter): Support FIELD_LOC_KIND_DWARF_BLOCK. * gdbtypes.h (enum field_loc_kind): New entry FIELD_LOC_KIND_DWARF_BLOCK. (struct main_type): New loc entry dwarf_block. (struct call_site, FIELD_DWARF_BLOCK, SET_FIELD_DWARF_BLOCK) (TYPE_FIELD_DWARF_BLOCK): New. * python/py-type.c: Include dwarf2loc.h. (check_types_equal): Support FIELD_LOC_KIND_DWARF_BLOCK. New internal_error call on unknown FIELD_LOC_KIND. * symtab.h (struct symtab): New field call_site_htab. * utils.c (do_htab_delete_cleanup, make_cleanup_htab_delete) (core_addr_hash, core_addr_eq): New functions. gdb/testsuite/ Implement basic support for DW_TAG_GNU_call_site. * gdb.arch/Makefile.in (EXECUTABLES): Add amd64-entry-value. * gdb.arch/amd64-entry-value.cc: New file. * gdb.arch/amd64-entry-value.exp: New file.
359 lines
9.4 KiB
C
359 lines
9.4 KiB
C
/* Block-related functions for the GNU debugger, GDB.
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Copyright (C) 2003, 2007, 2008, 2009, 2010, 2011
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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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#include "exceptions.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 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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/* 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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struct blockvector *
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blockvector_for_pc_sect (CORE_ADDR pc, struct obj_section *section,
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struct block **pblock, struct symtab *symtab)
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{
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struct block *b;
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int bot, top, half;
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struct blockvector *bl;
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if (symtab == 0) /* if no symtab specified by caller */
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{
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/* First search all symtabs for one whose file contains our pc */
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symtab = find_pc_sect_symtab (pc, section);
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if (symtab == 0)
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return 0;
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}
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bl = BLOCKVECTOR (symtab);
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/* Then search that symtab for the smallest block that wins. */
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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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{
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b = addrmap_find (BLOCKVECTOR_MAP (bl), pc);
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if (b)
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{
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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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else
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return 0;
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}
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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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bot = 0;
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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 >= 0)
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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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{
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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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bot--;
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}
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return 0;
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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 symtab *symtab;
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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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symtab = find_pc_symtab (pc - 1);
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if (symtab != NULL && symtab->call_site_htab != NULL)
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slot = htab_find_slot (symtab->call_site_htab, &pc, NO_INSERT);
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if (slot == NULL)
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{
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struct 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 == NULL ? "???" : SYMBOL_PRINT_NAME (msym));
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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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struct blockvector *
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blockvector_for_pc (CORE_ADDR pc, 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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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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struct blockvector *bl;
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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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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_alloc (obstack, sizeof (struct block));
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BLOCK_START (bl) = 0;
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BLOCK_END (bl) = 0;
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BLOCK_FUNCTION (bl) = NULL;
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BLOCK_SUPERBLOCK (bl) = NULL;
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BLOCK_DICT (bl) = NULL;
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BLOCK_NAMESPACE (bl) = NULL;
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return bl;
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}
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