/* 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, 2004
- 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,
+ 2010 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"
#include "command.h"
#include "gdbcmd.h"
#include "block.h"
-
-/* Prototypes for exported functions. */
-
-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
-deprecated_inside_entry_file (CORE_ADDR addr)
-{
- if (addr == 0)
- return 1;
- if (symfile_objfile == 0)
- return 0;
- if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT
- || CALL_DUMMY_LOCATION == AT_SYMBOL)
- {
- /* 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.deprecated_entry_file_lowpc &&
- addr < symfile_objfile->ei.deprecated_entry_file_highpc);
-}
-
-/* Test whether PC is in the range of addresses that corresponds to
- the "main" function. */
-
-int
-inside_main_func (CORE_ADDR pc)
-{
- struct minimal_symbol *msymbol;
-
- if (symfile_objfile == 0)
- return 0;
-
- msymbol = lookup_minimal_symbol (main_name (), NULL, symfile_objfile);
-
- /* If the address range hasn't been set up at symbol reading time,
- set it up now. */
-
- if (msymbol != NULL
- && symfile_objfile->ei.main_func_lowpc == INVALID_ENTRY_LOWPC
- && symfile_objfile->ei.main_func_highpc == INVALID_ENTRY_HIGHPC)
- {
- /* brobecker/2003-10-10: We used to rely on lookup_symbol() to
- search the symbol associated to the "main" function.
- Unfortunately, lookup_symbol() uses the current-language
- la_lookup_symbol_nonlocal function to do the global symbol
- search. Depending on the language, this can introduce
- certain side-effects, because certain languages, for instance
- Ada, may find more than one match. Therefore we prefer to
- search the "main" function symbol using its address rather
- than its name. */
- struct symbol *mainsym =
- find_pc_function (SYMBOL_VALUE_ADDRESS (msymbol));
-
- 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));
- }
- }
-
- /* Not in the normal symbol tables, see if "main" is in the partial
- symbol table. If it's not, then give up. */
- if (msymbol != NULL && MSYMBOL_TYPE (msymbol) == mst_text)
- {
- CORE_ADDR maddr = SYMBOL_VALUE_ADDRESS (msymbol);
- asection *msect = SYMBOL_BFD_SECTION (msymbol);
- struct obj_section *osect = find_pc_sect_section (maddr, msect);
-
- if (osect != NULL)
- {
- int i;
-
- /* 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. */
- for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++)
- {
- if (SYMBOL_VALUE_ADDRESS (msymbol + i) != maddr
- && SYMBOL_BFD_SECTION (msymbol + i) == msect)
- break;
- }
-
- symfile_objfile->ei.main_func_lowpc = maddr;
-
- /* Use the lesser of the next minimal symbol in the same
- section, or the end of the section, as the end of the
- function. */
- if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL
- && SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr)
- symfile_objfile->ei.main_func_highpc =
- 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. */
- symfile_objfile->ei.main_func_highpc = osect->endaddr;
- }
- }
-
- return (symfile_objfile->ei.main_func_lowpc <= pc
- && symfile_objfile->ei.main_func_highpc > pc);
-}
-
-/* Test whether THIS_FRAME is inside the process entry point function. */
-
-int
-inside_entry_func (struct frame_info *this_frame)
-{
- return (get_frame_func (this_frame) == entry_point_address ());
-}
-
-/* Similar to inside_entry_func, but accomodating legacy frame code. */
-
-static int
-legacy_inside_entry_func (CORE_ADDR pc)
-{
- if (symfile_objfile == 0)
- return 0;
-
- if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
- {
- /* Do not stop backtracing if the program counter is in the call
- dummy at the entry point. */
- /* FIXME: This 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;
-
- func_start = get_frame_func (frame);
- if (func_start)
- {
- func_start += FUNCTION_START_OFFSET;
- /* NOTE: cagney/2004-02-09: Eliminated per-architecture
- PROLOGUE_FRAMELESS_P call as architectures with custom
- implementations had all been deleted. Eventually even this
- function can go - GDB no longer tries to differentiate
- between framed, frameless and stackless functions. They are
- all now considered equally evil :-^. */
- /* If skipping the prologue ends up skips nothing, there must be
- no prologue and hence no code creating a frame. There for
- the function is "frameless" :-/. */
- return func_start == SKIP_PROLOGUE (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;
-}
+#include "inline-frame.h"
+#include "psymtab.h"
/* Return the innermost lexical block in execution
in a specified stack frame. The frame address is assumed valid.
get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
{
const CORE_ADDR pc = get_frame_address_in_block (frame);
+ struct block *bl;
+ int inline_count;
if (addr_in_block)
*addr_in_block = pc;
- return block_for_pc (pc);
+ bl = block_for_pc (pc);
+ if (bl == NULL)
+ return NULL;
+
+ inline_count = frame_inlined_callees (frame);
+
+ while (inline_count > 0)
+ {
+ if (block_inlined_p (bl))
+ inline_count--;
+
+ bl = BLOCK_SUPERBLOCK (bl);
+ gdb_assert (bl != NULL);
+ }
+
+ return bl;
}
CORE_ADDR
bl = block_for_pc (pc);
if (bl)
{
- struct symbol *symbol = block_function (bl);
+ struct symbol *symbol = block_linkage_function (bl);
if (symbol)
{
get_frame_function (struct frame_info *frame)
{
struct block *bl = get_frame_block (frame, 0);
- if (bl == 0)
- return 0;
- return block_function (bl);
+
+ if (bl == NULL)
+ return NULL;
+
+ while (BLOCK_FUNCTION (bl) == NULL && BLOCK_SUPERBLOCK (bl) != NULL)
+ bl = BLOCK_SUPERBLOCK (bl);
+
+ return BLOCK_FUNCTION (bl);
}
\f
Returns 0 if function is not known. */
struct symbol *
-find_pc_sect_function (CORE_ADDR pc, struct bfd_section *section)
+find_pc_sect_function (CORE_ADDR pc, struct obj_section *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 bfd_section *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 partial_symtab *pst;
+ struct obj_section *section;
struct symbol *f;
struct minimal_symbol *msymbol;
- struct partial_symbol *psb;
- struct obj_section *osect;
+ struct symtab *symtab = NULL;
+ struct objfile *objfile;
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)
+ ALL_OBJFILES (objfile)
+ {
+ if (objfile->sf)
+ symtab = objfile->sf->qf->find_pc_sect_symtab (objfile, msymbol,
+ mapped_pc, section, 0);
+ if (symtab)
+ break;
+ }
+
+ if (symtab)
{
- /* Need to read the symbols to get a good value for the end address. */
- if (endaddr != NULL && !pst->readin)
- {
- /* Need to get the terminal in case symbol-reading produces
- output. */
- target_terminal_ours_for_output ();
- PSYMTAB_TO_SYMTAB (pst);
- }
-
- if (pst->readin)
- {
- /* Checking whether the msymbol has a larger value is for the
- "pathological" case mentioned in print_frame_info. */
- f = find_pc_sect_function (mapped_pc, section);
- if (f != NULL
- && (msymbol == NULL
- || (BLOCK_START (SYMBOL_BLOCK_VALUE (f))
- >= SYMBOL_VALUE_ADDRESS (msymbol))))
- {
- 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_section = section;
- goto return_cached_value;
- }
- }
- else
+ /* Checking whether the msymbol has a larger value is for the
+ "pathological" case mentioned in print_frame_info. */
+ f = find_pc_sect_function (mapped_pc, section);
+ if (f != NULL
+ && (msymbol == NULL
+ || (BLOCK_START (SYMBOL_BLOCK_VALUE (f))
+ >= SYMBOL_VALUE_ADDRESS (msymbol))))
{
- /* Now that static symbols go in the minimal symbol table, perhaps
- we could just ignore the partial symbols. But at least for now
- we use the partial or minimal symbol, whichever is larger. */
- psb = find_pc_sect_psymbol (pst, mapped_pc, section);
-
- if (psb
- && (msymbol == NULL ||
- (SYMBOL_VALUE_ADDRESS (psb)
- >= SYMBOL_VALUE_ADDRESS (msymbol))))
- {
- /* This case isn't being cached currently. */
- if (address)
- *address = SYMBOL_VALUE_ADDRESS (psb);
- if (name)
- *name = DEPRECATED_SYMBOL_NAME (psb);
- /* endaddr non-NULL can't happen here. */
- return 1;
- }
+ cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
+ cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
+ cache_pc_function_name = SYMBOL_LINKAGE_NAME (f);
+ cache_pc_function_section = section;
+ goto return_cached_value;
}
}
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)
-{
- struct bfd_section *bfd_section;
-
- /* 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). */
- bfd_section = find_pc_overlay (pc);
- if (bfd_section == NULL)
- {
- struct obj_section *obj_section = find_pc_section (pc);
- if (obj_section == NULL)
- bfd_section = NULL;
- else
- bfd_section = obj_section->the_bfd_section;
- }
- return find_pc_sect_partial_function (pc, bfd_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. */
struct frame_info *frame;
CORE_ADDR start;
CORE_ADDR end;
- CORE_ADDR calling_pc;
if (block == NULL)
return 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 = get_frame_address_in_block (frame);
- if (calling_pc >= start && calling_pc < end)
+ struct block *frame_block = get_frame_block (frame, NULL);
+ if (frame_block != NULL && contained_in (frame_block, block))
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)
-{
- CORE_ADDR addr = entry_point_address ();
- if (DEPRECATED_CALL_DUMMY_ADDRESS_P ())
- addr = DEPRECATED_CALL_DUMMY_ADDRESS ();
- return ((pc) >= addr && (pc) <= (addr + 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 (legacy_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 (deprecated_inside_entry_file (frame_pc_unwind (fi)))
- return 0;
+ frame = get_prev_frame (frame);
+ }
- return 1;
+ return NULL;
}
projects / deliverable / binutils-gdb.git / blobdiff