/* Get info from stack frames; convert between frames, blocks,
functions and pc values.
- Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
- 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
- Foundation, Inc.
+ Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
+ 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009
+ Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "symtab.h"
#include "bfd.h"
-#include "symfile.h"
#include "objfiles.h"
#include "frame.h"
#include "gdbcore.h"
-#include "value.h" /* for read_register */
-#include "target.h" /* for target_has_stack */
-#include "inferior.h" /* for read_pc */
+#include "value.h"
+#include "target.h"
+#include "inferior.h"
#include "annotate.h"
#include "regcache.h"
#include "gdb_assert.h"
void _initialize_blockframe (void);
-/* Is ADDR inside the startup file? Note that if your machine has a
- way to detect the bottom of the stack, there is no need to call
- this function from DEPRECATED_FRAME_CHAIN_VALID; the reason for
- doing so is that some machines have no way of detecting bottom of
- stack.
-
- A PC of zero is always considered to be the bottom of the stack. */
-
-int
-inside_entry_file (CORE_ADDR addr)
-{
- if (addr == 0)
- return 1;
- if (symfile_objfile == 0)
- return 0;
- if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
- {
- /* Do not stop backtracing if the pc is in the call dummy
- at the entry point. */
- /* FIXME: Won't always work with zeros for the last two arguments */
- if (DEPRECATED_PC_IN_CALL_DUMMY (addr, 0, 0))
- return 0;
- }
- return (addr >= symfile_objfile->ei.entry_file_lowpc &&
- addr < symfile_objfile->ei.entry_file_highpc);
-}
-
-/* Test a specified PC value to see if it is in the range of addresses
- that correspond to the main() function. See comments above for why
- we might want to do this.
-
- Typically called from DEPRECATED_FRAME_CHAIN_VALID.
-
- A PC of zero is always considered to be the bottom of the stack. */
-
-int
-inside_main_func (CORE_ADDR pc)
-{
- if (pc == 0)
- return 1;
- if (symfile_objfile == 0)
- return 0;
-
- /* If the addr range is not set up at symbol reading time, set it up
- now. This is for DEPRECATED_FRAME_CHAIN_VALID_ALTERNATE. I do
- this for coff, because it is unable to set it up and symbol
- reading time. */
-
- if (symfile_objfile->ei.main_func_lowpc == INVALID_ENTRY_LOWPC &&
- symfile_objfile->ei.main_func_highpc == INVALID_ENTRY_HIGHPC)
- {
- struct symbol *mainsym;
-
- mainsym = lookup_symbol (main_name (), NULL, VAR_DOMAIN, NULL, NULL);
- if (mainsym && SYMBOL_CLASS (mainsym) == LOC_BLOCK)
- {
- symfile_objfile->ei.main_func_lowpc =
- BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym));
- symfile_objfile->ei.main_func_highpc =
- BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym));
- }
- }
- return (symfile_objfile->ei.main_func_lowpc <= pc &&
- symfile_objfile->ei.main_func_highpc > pc);
-}
-
-/* Test a specified PC value to see if it is in the range of addresses
- that correspond to the process entry point function. See comments
- in objfiles.h for why we might want to do this.
-
- Typically called from DEPRECATED_FRAME_CHAIN_VALID.
-
- A PC of zero is always considered to be the bottom of the stack. */
-
-int
-inside_entry_func (CORE_ADDR pc)
-{
- if (pc == 0)
- return 1;
- if (symfile_objfile == 0)
- return 0;
- if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
- {
- /* Do not stop backtracing if the pc is in the call dummy
- at the entry point. */
- /* FIXME: Won't always work with zeros for the last two arguments */
- if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0))
- return 0;
- }
- return (symfile_objfile->ei.entry_func_lowpc <= pc &&
- symfile_objfile->ei.entry_func_highpc > pc);
-}
-
-/* Return nonzero if the function for this frame lacks a prologue. Many
- machines can define FRAMELESS_FUNCTION_INVOCATION to just call this
- function. */
-
-int
-frameless_look_for_prologue (struct frame_info *frame)
-{
- CORE_ADDR func_start, after_prologue;
-
- func_start = get_frame_func (frame);
- if (func_start)
- {
- func_start += FUNCTION_START_OFFSET;
- /* This is faster, since only care whether there *is* a
- prologue, not how long it is. */
- return PROLOGUE_FRAMELESS_P (func_start);
- }
- else if (get_frame_pc (frame) == 0)
- /* A frame with a zero PC is usually created by dereferencing a
- NULL function pointer, normally causing an immediate core dump
- of the inferior. Mark function as frameless, as the inferior
- has no chance of setting up a stack frame. */
- return 1;
- else
- /* If we can't find the start of the function, we don't really
- know whether the function is frameless, but we should be able
- to get a reasonable (i.e. best we can do under the
- circumstances) backtrace by saying that it isn't. */
- return 0;
-}
-
-/* return the address of the PC for the given FRAME, ie the current PC value
- if FRAME is the innermost frame, or the address adjusted to point to the
- call instruction if not. */
-
-CORE_ADDR
-frame_address_in_block (struct frame_info *frame)
-{
- CORE_ADDR pc = get_frame_pc (frame);
-
- /* If we are not in the innermost frame, and we are not interrupted
- by a signal, frame->pc points to the instruction following the
- call. As a consequence, we need to get the address of the previous
- instruction. Unfortunately, this is not straightforward to do, so
- we just use the address minus one, which is a good enough
- approximation. */
- /* FIXME: cagney/2002-11-10: Should this instead test for
- NORMAL_FRAME? A dummy frame (in fact all the abnormal frames)
- save the PC value in the block. */
- if (get_next_frame (frame) != 0
- && get_frame_type (get_next_frame (frame)) != SIGTRAMP_FRAME)
- --pc;
-
- return pc;
-}
-
/* Return the innermost lexical block in execution
in a specified stack frame. The frame address is assumed valid.
struct block *
get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
{
- const CORE_ADDR pc = frame_address_in_block (frame);
+ const CORE_ADDR pc = get_frame_address_in_block (frame);
if (addr_in_block)
*addr_in_block = pc;
bl = block_for_pc (pc);
if (bl)
{
- struct symbol *symbol = block_function (bl);
+ struct symbol *symbol = block_linkage_function (bl);
if (symbol)
{
struct symbol *
get_frame_function (struct frame_info *frame)
{
- register struct block *bl = get_frame_block (frame, 0);
+ struct block *bl = get_frame_block (frame, 0);
if (bl == 0)
return 0;
- return block_function (bl);
+ return block_linkage_function (bl);
}
\f
Returns 0 if function is not known. */
struct symbol *
-find_pc_sect_function (CORE_ADDR pc, struct sec *section)
+find_pc_sect_function (CORE_ADDR pc, struct obj_section *section)
{
- register struct block *b = block_for_pc_sect (pc, section);
+ struct block *b = block_for_pc_sect (pc, section);
if (b == 0)
return 0;
- return block_function (b);
+ return block_linkage_function (b);
}
/* Return the function containing pc value PC.
static CORE_ADDR cache_pc_function_low = 0;
static CORE_ADDR cache_pc_function_high = 0;
static char *cache_pc_function_name = 0;
-static struct sec *cache_pc_function_section = NULL;
+static struct obj_section *cache_pc_function_section = NULL;
/* Clear cache, e.g. when symbol table is discarded. */
If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and
returns 0. */
+/* Backward compatibility, no section argument. */
+
int
-find_pc_sect_partial_function (CORE_ADDR pc, asection *section, char **name,
- CORE_ADDR *address, CORE_ADDR *endaddr)
+find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address,
+ CORE_ADDR *endaddr)
{
+ struct obj_section *section;
struct partial_symtab *pst;
struct symbol *f;
struct minimal_symbol *msymbol;
struct partial_symbol *psb;
- struct obj_section *osect;
int i;
CORE_ADDR mapped_pc;
+ /* To ensure that the symbol returned belongs to the correct setion
+ (and that the last [random] symbol from the previous section
+ isn't returned) try to find the section containing PC. First try
+ the overlay code (which by default returns NULL); and second try
+ the normal section code (which almost always succeeds). */
+ section = find_pc_overlay (pc);
+ if (section == NULL)
+ section = find_pc_section (pc);
+
mapped_pc = overlay_mapped_address (pc, section);
if (mapped_pc >= cache_pc_function_low
&& section == cache_pc_function_section)
goto return_cached_value;
- /* If sigtramp is in the u area, it counts as a function (especially
- important for step_1). */
- if (SIGTRAMP_START_P () && PC_IN_SIGTRAMP (mapped_pc, (char *) NULL))
- {
- cache_pc_function_low = SIGTRAMP_START (mapped_pc);
- cache_pc_function_high = SIGTRAMP_END (mapped_pc);
- cache_pc_function_name = "<sigtramp>";
- cache_pc_function_section = section;
- goto return_cached_value;
- }
-
msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section);
pst = find_pc_sect_psymtab (mapped_pc, section);
if (pst)
{
cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
- cache_pc_function_name = DEPRECATED_SYMBOL_NAME (f);
+ cache_pc_function_name = SYMBOL_LINKAGE_NAME (f);
cache_pc_function_section = section;
goto return_cached_value;
}
if (address)
*address = SYMBOL_VALUE_ADDRESS (psb);
if (name)
- *name = DEPRECATED_SYMBOL_NAME (psb);
+ *name = SYMBOL_LINKAGE_NAME (psb);
/* endaddr non-NULL can't happen here. */
return 1;
}
of the text seg doesn't appear to be part of the last function in the
text segment. */
- osect = find_pc_sect_section (mapped_pc, section);
-
- if (!osect)
+ if (!section)
msymbol = NULL;
/* Must be in the minimal symbol table. */
}
cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
- cache_pc_function_name = DEPRECATED_SYMBOL_NAME (msymbol);
+ cache_pc_function_name = SYMBOL_LINKAGE_NAME (msymbol);
cache_pc_function_section = section;
- /* Use the lesser of the next minimal symbol in the same section, or
- the end of the section, as the end of the function. */
-
- /* Step over other symbols at this same address, and symbols in
- other sections, to find the next symbol in this section with
- a different address. */
+ /* If the minimal symbol has a size, use it for the cache.
+ Otherwise use the lesser of the next minimal symbol in the same
+ section, or the end of the section, as the end of the
+ function. */
- for (i = 1; DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL; i++)
+ if (MSYMBOL_SIZE (msymbol) != 0)
+ cache_pc_function_high = cache_pc_function_low + MSYMBOL_SIZE (msymbol);
+ else
{
- if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol)
- && SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol))
- break;
- }
+ /* Step over other symbols at this same address, and symbols in
+ other sections, to find the next symbol in this section with
+ a different address. */
- if (DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL
- && SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr)
- cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i);
- else
- /* We got the start address from the last msymbol in the objfile.
- So the end address is the end of the section. */
- cache_pc_function_high = osect->endaddr;
+ for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++)
+ {
+ if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol)
+ && SYMBOL_OBJ_SECTION (msymbol + i) == SYMBOL_OBJ_SECTION (msymbol))
+ break;
+ }
+
+ if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL
+ && SYMBOL_VALUE_ADDRESS (msymbol + i) < obj_section_endaddr (section))
+ cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i);
+ else
+ /* We got the start address from the last msymbol in the objfile.
+ So the end address is the end of the section. */
+ cache_pc_function_high = obj_section_endaddr (section);
+ }
return_cached_value:
return 1;
}
-/* Backward compatibility, no section argument. */
-
-int
-find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address,
- CORE_ADDR *endaddr)
-{
- asection *section;
-
- section = find_pc_overlay (pc);
- return find_pc_sect_partial_function (pc, section, name, address, endaddr);
-}
-
/* Return the innermost stack frame executing inside of BLOCK,
or NULL if there is no such frame. If BLOCK is NULL, just return NULL. */
block_innermost_frame (struct block *block)
{
struct frame_info *frame;
- register CORE_ADDR start;
- register CORE_ADDR end;
+ CORE_ADDR start;
+ CORE_ADDR end;
CORE_ADDR calling_pc;
if (block == NULL)
start = BLOCK_START (block);
end = BLOCK_END (block);
- frame = NULL;
- while (1)
+ frame = get_current_frame ();
+ while (frame != NULL)
{
- frame = get_prev_frame (frame);
- if (frame == NULL)
- return NULL;
- calling_pc = frame_address_in_block (frame);
+ calling_pc = get_frame_address_in_block (frame);
if (calling_pc >= start && calling_pc < end)
return frame;
- }
-}
-
-/* Are we in a call dummy? The code below which allows DECR_PC_AFTER_BREAK
- below is for infrun.c, which may give the macro a pc without that
- subtracted out. */
-
-/* Is the PC in a call dummy? SP and FRAME_ADDRESS are the bottom and
- top of the stack frame which we are checking, where "bottom" and
- "top" refer to some section of memory which contains the code for
- the call dummy. Calls to this macro assume that the contents of
- SP_REGNUM and DEPRECATED_FP_REGNUM (or the saved values thereof),
- respectively, are the things to pass.
-
- This won't work on the 29k, where SP_REGNUM and
- DEPRECATED_FP_REGNUM don't have that meaning, but the 29k doesn't
- use ON_STACK. This could be fixed by generalizing this scheme,
- perhaps by passing in a frame and adding a few fields, at least on
- machines which need them for DEPRECATED_PC_IN_CALL_DUMMY.
-
- Something simpler, like checking for the stack segment, doesn't work,
- since various programs (threads implementations, gcc nested function
- stubs, etc) may either allocate stack frames in another segment, or
- allocate other kinds of code on the stack. */
-
-int
-deprecated_pc_in_call_dummy_on_stack (CORE_ADDR pc, CORE_ADDR sp,
- CORE_ADDR frame_address)
-{
- return (INNER_THAN ((sp), (pc))
- && (frame_address != 0)
- && INNER_THAN ((pc), (frame_address)));
-}
-
-int
-deprecated_pc_in_call_dummy_at_entry_point (CORE_ADDR pc, CORE_ADDR sp,
- CORE_ADDR frame_address)
-{
- return ((pc) >= CALL_DUMMY_ADDRESS ()
- && (pc) <= (CALL_DUMMY_ADDRESS () + DECR_PC_AFTER_BREAK));
-}
-
-/* Returns true for a user frame or a call_function_by_hand dummy
- frame, and false for the CRT0 start-up frame. Purpose is to
- terminate backtrace. */
-int
-legacy_frame_chain_valid (CORE_ADDR fp, struct frame_info *fi)
-{
- /* Don't prune CALL_DUMMY frames. */
- if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
- && DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0))
- return 1;
-
- /* If the new frame pointer is zero, then it isn't valid. */
- if (fp == 0)
- return 0;
-
- /* If the new frame would be inside (younger than) the previous frame,
- then it isn't valid. */
- if (INNER_THAN (fp, get_frame_base (fi)))
- return 0;
-
- /* If the architecture has a custom DEPRECATED_FRAME_CHAIN_VALID,
- call it now. */
- if (DEPRECATED_FRAME_CHAIN_VALID_P ())
- return DEPRECATED_FRAME_CHAIN_VALID (fp, fi);
-
- /* If we're already inside the entry function for the main objfile, then it
- isn't valid. */
- if (inside_entry_func (get_frame_pc (fi)))
- return 0;
-
- /* If we're inside the entry file, it isn't valid. */
- /* NOTE/drow 2002-12-25: should there be a way to disable this check? It
- assumes a single small entry file, and the way some debug readers (e.g.
- dbxread) figure out which object is the entry file is somewhat hokey. */
- if (inside_entry_file (frame_pc_unwind (fi)))
- return 0;
+ frame = get_prev_frame (frame);
+ }
- return 1;
+ return NULL;
}