-/* Get info from stack frames;
- convert between frames, blocks, functions and pc values.
- Copyright 1986, 87, 88, 89, 91, 94, 95, 96, 97, 1998
- Free Software Foundation, Inc.
+/* Get info from stack frames; convert between frames, blocks,
+ functions and pc values.
+
+ Copyright (C) 1986-2020 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"
-
-/* Prototypes for exported functions. */
-
-void _initialize_blockframe (void);
-
-/* A default FRAME_CHAIN_VALID, in the form that is suitable for most
- targets. If FRAME_CHAIN_VALID returns zero it means that the given
- frame is the outermost one and has no caller. */
-
-int
-default_frame_chain_valid (chain, thisframe)
- CORE_ADDR chain;
- struct frame_info *thisframe;
-{
- return ((chain) != 0
- && !inside_main_func ((thisframe)->pc)
- && !inside_entry_func ((thisframe)->pc));
-}
-
-/* Use the alternate method of avoiding running up off the end of the
- frame chain or following frames back into the startup code. See
- the comments in objfiles.h. */
-
-int
-alternate_frame_chain_valid (chain, thisframe)
- CORE_ADDR chain;
- struct frame_info *thisframe;
-{
- return ((chain) != 0
- && !inside_entry_file (FRAME_SAVED_PC (thisframe)));
-}
-
-/* A very simple method of determining a valid frame */
-
-int
-nonnull_frame_chain_valid (chain, thisframe)
- CORE_ADDR chain;
- struct frame_info *thisframe;
+#include "regcache.h"
+#include "dummy-frame.h"
+#include "command.h"
+#include "gdbcmd.h"
+#include "block.h"
+#include "inline-frame.h"
+
+/* Return the innermost lexical block in execution in a specified
+ stack frame. The frame address is assumed valid.
+
+ If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code
+ address we used to choose the block. We use this to find a source
+ line, to decide which macro definitions are in scope.
+
+ The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's
+ PC, and may not really be a valid PC at all. For example, in the
+ caller of a function declared to never return, the code at the
+ return address will never be reached, so the call instruction may
+ be the very last instruction in the block. So the address we use
+ to choose the block is actually one byte before the return address
+ --- hopefully pointing us at the call instruction, or its delay
+ slot instruction. */
+
+const struct block *
+get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
{
- return ((chain) != 0);
-}
-
-/* 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 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 (addr)
- 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 (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 FRAME_CHAIN_VALID.
-
- A PC of zero is always considered to be the bottom of the stack. */
-
-int
-inside_main_func (pc)
- 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 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;
+ CORE_ADDR pc;
+ const struct block *bl;
+ int inline_count;
- mainsym = lookup_symbol ("main", NULL, VAR_NAMESPACE, 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);
-}
+ if (!get_frame_address_in_block_if_available (frame, &pc))
+ return NULL;
-/* 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.
+ if (addr_in_block)
+ *addr_in_block = pc;
- Typically called from FRAME_CHAIN_VALID.
+ bl = block_for_pc (pc);
+ if (bl == NULL)
+ return NULL;
- A PC of zero is always considered to be the bottom of the stack. */
+ inline_count = frame_inlined_callees (frame);
-int
-inside_entry_func (pc)
- CORE_ADDR pc;
-{
- if (pc == 0)
- return 1;
- if (symfile_objfile == 0)
- return 0;
- if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
+ while (inline_count > 0)
{
- /* 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 (PC_IN_CALL_DUMMY (pc, 0, 0))
- return 0;
- }
- return (symfile_objfile->ei.entry_func_lowpc <= pc &&
- symfile_objfile->ei.entry_func_highpc > pc);
-}
-
-/* Info about the innermost stack frame (contents of FP register) */
+ if (block_inlined_p (bl))
+ inline_count--;
-static struct frame_info *current_frame;
-
-/* Cache for frame addresses already read by gdb. Valid only while
- inferior is stopped. Control variables for the frame cache should
- be local to this module. */
-
-static struct obstack frame_cache_obstack;
-
-void *
-frame_obstack_alloc (size)
- unsigned long size;
-{
- return obstack_alloc (&frame_cache_obstack, size);
-}
-
-void
-frame_saved_regs_zalloc (fi)
- struct frame_info *fi;
-{
- fi->saved_regs = (CORE_ADDR *)
- frame_obstack_alloc (SIZEOF_FRAME_SAVED_REGS);
- memset (fi->saved_regs, 0, SIZEOF_FRAME_SAVED_REGS);
-}
-
-
-/* Return the innermost (currently executing) stack frame. */
-
-struct frame_info *
-get_current_frame ()
-{
- if (current_frame == NULL)
- {
- if (target_has_stack)
- current_frame = create_new_frame (read_fp (), read_pc ());
- else
- error ("No stack.");
+ bl = BLOCK_SUPERBLOCK (bl);
+ gdb_assert (bl != NULL);
}
- return current_frame;
-}
-
-void
-set_current_frame (frame)
- struct frame_info *frame;
-{
- current_frame = frame;
-}
-
-/* Create an arbitrary (i.e. address specified by user) or innermost frame.
- Always returns a non-NULL value. */
-struct frame_info *
-create_new_frame (addr, pc)
- CORE_ADDR addr;
- CORE_ADDR pc;
-{
- struct frame_info *fi;
- char *name;
-
- fi = (struct frame_info *)
- obstack_alloc (&frame_cache_obstack,
- sizeof (struct frame_info));
-
- /* Arbitrary frame */
- fi->saved_regs = NULL;
- fi->next = NULL;
- fi->prev = NULL;
- fi->frame = addr;
- fi->pc = pc;
- find_pc_partial_function (pc, &name, (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
- fi->signal_handler_caller = IN_SIGTRAMP (fi->pc, name);
-
-#ifdef INIT_EXTRA_FRAME_INFO
- INIT_EXTRA_FRAME_INFO (0, fi);
-#endif
-
- return fi;
-}
-
-/* Return the frame that FRAME calls (NULL if FRAME is the innermost
- frame). */
-
-struct frame_info *
-get_next_frame (frame)
- struct frame_info *frame;
-{
- return frame->next;
-}
-
-/* Flush the entire frame cache. */
-
-void
-flush_cached_frames ()
-{
- /* Since we can't really be sure what the first object allocated was */
- obstack_free (&frame_cache_obstack, 0);
- obstack_init (&frame_cache_obstack);
-
- current_frame = NULL; /* Invalidate cache */
- select_frame (NULL, -1);
- annotate_frames_invalid ();
-}
-
-/* Flush the frame cache, and start a new one if necessary. */
-
-void
-reinit_frame_cache ()
-{
- flush_cached_frames ();
-
- /* FIXME: The inferior_pid test is wrong if there is a corefile. */
- if (inferior_pid != 0)
- {
- select_frame (get_current_frame (), 0);
- }
+ return bl;
}
-/* 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 (frame)
- struct frame_info *frame;
+CORE_ADDR
+get_pc_function_start (CORE_ADDR pc)
{
- CORE_ADDR func_start, after_prologue;
+ const struct block *bl;
+ struct bound_minimal_symbol msymbol;
- func_start = get_pc_function_start (frame->pc);
- if (func_start)
+ bl = block_for_pc (pc);
+ if (bl)
{
- func_start += FUNCTION_START_OFFSET;
- after_prologue = func_start;
-#ifdef SKIP_PROLOGUE_FRAMELESS_P
- /* This is faster, since only care whether there *is* a
- prologue, not how long it is. */
- after_prologue = SKIP_PROLOGUE_FRAMELESS_P (after_prologue);
-#else
- after_prologue = SKIP_PROLOGUE (after_prologue);
-#endif
- return after_prologue == func_start;
- }
- else if (frame->pc == 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;
-}
-
-/* Default a few macros that people seldom redefine. */
-
-#if !defined (INIT_FRAME_PC)
-#define INIT_FRAME_PC(fromleaf, prev) \
- prev->pc = (fromleaf ? SAVED_PC_AFTER_CALL (prev->next) : \
- prev->next ? FRAME_SAVED_PC (prev->next) : read_pc ());
-#endif
-
-#ifndef FRAME_CHAIN_COMBINE
-#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
-#endif
-
-/* Return a structure containing various interesting information
- about the frame that called NEXT_FRAME. Returns NULL
- if there is no such frame. */
-
-struct frame_info *
-get_prev_frame (next_frame)
- struct frame_info *next_frame;
-{
- CORE_ADDR address = 0;
- struct frame_info *prev;
- int fromleaf = 0;
- char *name;
-
- /* If the requested entry is in the cache, return it.
- Otherwise, figure out what the address should be for the entry
- we're about to add to the cache. */
+ struct symbol *symbol = block_linkage_function (bl);
- if (!next_frame)
- {
-#if 0
- /* This screws value_of_variable, which just wants a nice clean
- NULL return from block_innermost_frame if there are no frames.
- I don't think I've ever seen this message happen otherwise.
- And returning NULL here is a perfectly legitimate thing to do. */
- if (!current_frame)
+ if (symbol)
{
- error ("You haven't set up a process's stack to examine.");
+ bl = SYMBOL_BLOCK_VALUE (symbol);
+ return BLOCK_ENTRY_PC (bl);
}
-#endif
-
- return current_frame;
}
- /* If we have the prev one, return it */
- if (next_frame->prev)
- return next_frame->prev;
-
- /* On some machines it is possible to call a function without
- setting up a stack frame for it. On these machines, we
- define this macro to take two args; a frameinfo pointer
- identifying a frame and a variable to set or clear if it is
- or isn't leafless. */
-
- /* Still don't want to worry about this except on the innermost
- frame. This macro will set FROMLEAF if NEXT_FRAME is a
- frameless function invocation. */
- if (!(next_frame->next))
+ msymbol = lookup_minimal_symbol_by_pc (pc);
+ if (msymbol.minsym)
{
- fromleaf = FRAMELESS_FUNCTION_INVOCATION (next_frame);
- if (fromleaf)
- address = FRAME_FP (next_frame);
- }
+ CORE_ADDR fstart = BMSYMBOL_VALUE_ADDRESS (msymbol);
- if (!fromleaf)
- {
- /* Two macros defined in tm.h specify the machine-dependent
- actions to be performed here.
- First, get the frame's chain-pointer.
- If that is zero, the frame is the outermost frame or a leaf
- called by the outermost frame. This means that if start
- calls main without a frame, we'll return 0 (which is fine
- anyway).
-
- Nope; there's a problem. This also returns when the current
- routine is a leaf of main. This is unacceptable. We move
- this to after the ffi test; I'd rather have backtraces from
- start go curfluy than have an abort called from main not show
- main. */
- address = FRAME_CHAIN (next_frame);
- if (!FRAME_CHAIN_VALID (address, next_frame))
- return 0;
- address = FRAME_CHAIN_COMBINE (address, next_frame);
+ if (find_pc_section (fstart))
+ return fstart;
}
- if (address == 0)
- return 0;
- prev = (struct frame_info *)
- obstack_alloc (&frame_cache_obstack,
- sizeof (struct frame_info));
-
- prev->saved_regs = NULL;
- if (next_frame)
- next_frame->prev = prev;
- prev->next = next_frame;
- prev->prev = (struct frame_info *) 0;
- prev->frame = address;
- prev->signal_handler_caller = 0;
-
-/* This change should not be needed, FIXME! We should
- determine whether any targets *need* INIT_FRAME_PC to happen
- after INIT_EXTRA_FRAME_INFO and come up with a simple way to
- express what goes on here.
-
- INIT_EXTRA_FRAME_INFO is called from two places: create_new_frame
- (where the PC is already set up) and here (where it isn't).
- INIT_FRAME_PC is only called from here, always after
- INIT_EXTRA_FRAME_INFO.
-
- The catch is the MIPS, where INIT_EXTRA_FRAME_INFO requires the PC
- value (which hasn't been set yet). Some other machines appear to
- require INIT_EXTRA_FRAME_INFO before they can do INIT_FRAME_PC. Phoo.
-
- We shouldn't need INIT_FRAME_PC_FIRST to add more complication to
- an already overcomplicated part of GDB. gnu@cygnus.com, 15Sep92.
-
- Assuming that some machines need INIT_FRAME_PC after
- INIT_EXTRA_FRAME_INFO, one possible scheme:
-
- SETUP_INNERMOST_FRAME()
- Default version is just create_new_frame (read_fp ()),
- read_pc ()). Machines with extra frame info would do that (or the
- local equivalent) and then set the extra fields.
- SETUP_ARBITRARY_FRAME(argc, argv)
- Only change here is that create_new_frame would no longer init extra
- frame info; SETUP_ARBITRARY_FRAME would have to do that.
- INIT_PREV_FRAME(fromleaf, prev)
- Replace INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC. This should
- also return a flag saying whether to keep the new frame, or
- whether to discard it, because on some machines (e.g. mips) it
- is really awkward to have FRAME_CHAIN_VALID called *before*
- INIT_EXTRA_FRAME_INFO (there is no good way to get information
- deduced in FRAME_CHAIN_VALID into the extra fields of the new frame).
- std_frame_pc(fromleaf, prev)
- This is the default setting for INIT_PREV_FRAME. It just does what
- the default INIT_FRAME_PC does. Some machines will call it from
- INIT_PREV_FRAME (either at the beginning, the end, or in the middle).
- Some machines won't use it.
- kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
-
-#ifdef INIT_FRAME_PC_FIRST
- INIT_FRAME_PC_FIRST (fromleaf, prev);
-#endif
-
-#ifdef INIT_EXTRA_FRAME_INFO
- INIT_EXTRA_FRAME_INFO (fromleaf, prev);
-#endif
-
- /* This entry is in the frame queue now, which is good since
- FRAME_SAVED_PC may use that queue to figure out its value
- (see tm-sparc.h). We want the pc saved in the inferior frame. */
- INIT_FRAME_PC (fromleaf, prev);
-
- /* If ->frame and ->pc are unchanged, we are in the process of getting
- ourselves into an infinite backtrace. Some architectures check this
- in FRAME_CHAIN or thereabouts, but it seems like there is no reason
- this can't be an architecture-independent check. */
- if (next_frame != NULL)
- {
- if (prev->frame == next_frame->frame
- && prev->pc == next_frame->pc)
- {
- next_frame->prev = NULL;
- obstack_free (&frame_cache_obstack, prev);
- return NULL;
- }
- }
-
- find_pc_partial_function (prev->pc, &name,
- (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
- if (IN_SIGTRAMP (prev->pc, name))
- prev->signal_handler_caller = 1;
-
- return prev;
-}
-
-CORE_ADDR
-get_frame_pc (frame)
- struct frame_info *frame;
-{
- return frame->pc;
-}
-
-
-#ifdef FRAME_FIND_SAVED_REGS
-/* XXX - deprecated. This is a compatibility function for targets
- that do not yet implement FRAME_INIT_SAVED_REGS. */
-/* Find the addresses in which registers are saved in FRAME. */
-
-void
-get_frame_saved_regs (frame, saved_regs_addr)
- struct frame_info *frame;
- struct frame_saved_regs *saved_regs_addr;
-{
- if (frame->saved_regs == NULL)
- {
- frame->saved_regs = (CORE_ADDR *)
- frame_obstack_alloc (SIZEOF_FRAME_SAVED_REGS);
- }
- if (saved_regs_addr == NULL)
- {
- struct frame_saved_regs saved_regs;
- FRAME_FIND_SAVED_REGS (frame, saved_regs);
- memcpy (frame->saved_regs, &saved_regs, SIZEOF_FRAME_SAVED_REGS);
- }
- else
- {
- FRAME_FIND_SAVED_REGS (frame, *saved_regs_addr);
- memcpy (frame->saved_regs, saved_regs_addr, SIZEOF_FRAME_SAVED_REGS);
- }
-}
-#endif
-
-/* Return the innermost lexical block in execution
- in a specified stack frame. The frame address is assumed valid. */
-
-struct block *
-get_frame_block (frame)
- struct frame_info *frame;
-{
- CORE_ADDR pc;
-
- pc = frame->pc;
- if (frame->next != 0 && frame->next->signal_handler_caller == 0)
- /* We are not in the innermost frame and we were not interrupted
- by a signal. We need to subtract one to get the correct block,
- in case the call instruction was the last instruction of the block.
- If there are any machines on which the saved pc does not point to
- after the call insn, we probably want to make frame->pc point after
- the call insn anyway. */
- --pc;
- return block_for_pc (pc);
+ return 0;
}
-struct block *
-get_current_block ()
-{
- return block_for_pc (read_pc ());
-}
+/* Return the symbol for the function executing in frame FRAME. */
-CORE_ADDR
-get_pc_function_start (pc)
- CORE_ADDR pc;
+struct symbol *
+get_frame_function (struct frame_info *frame)
{
- register struct block *bl;
- register struct symbol *symbol;
- register struct minimal_symbol *msymbol;
- CORE_ADDR fstart;
+ const struct block *bl = get_frame_block (frame, 0);
- if ((bl = block_for_pc (pc)) != NULL &&
- (symbol = block_function (bl)) != NULL)
- {
- bl = SYMBOL_BLOCK_VALUE (symbol);
- fstart = BLOCK_START (bl);
- }
- else if ((msymbol = lookup_minimal_symbol_by_pc (pc)) != NULL)
- {
- fstart = SYMBOL_VALUE_ADDRESS (msymbol);
- }
- else
- {
- fstart = 0;
- }
- return (fstart);
-}
+ if (bl == NULL)
+ return NULL;
-/* Return the symbol for the function executing in frame FRAME. */
+ while (BLOCK_FUNCTION (bl) == NULL && BLOCK_SUPERBLOCK (bl) != NULL)
+ bl = BLOCK_SUPERBLOCK (bl);
-struct symbol *
-get_frame_function (frame)
- struct frame_info *frame;
-{
- register struct block *bl = get_frame_block (frame);
- if (bl == 0)
- return 0;
- return block_function (bl);
+ return BLOCK_FUNCTION (bl);
}
\f
-/* Return the blockvector immediately containing the innermost lexical block
- containing the specified pc value and section, or 0 if there is none.
- PINDEX is a pointer to the index value of the block. If PINDEX
- is NULL, we don't pass this information back to the caller. */
-
-struct blockvector *
-blockvector_for_pc_sect (pc, section, pindex, symtab)
- register CORE_ADDR pc;
- struct sec *section;
- int *pindex;
- struct symtab *symtab;
+/* Return the function containing pc value PC in section SECTION.
+ Returns 0 if function is not known. */
+struct symbol *
+find_pc_sect_function (CORE_ADDR pc, struct obj_section *section)
{
- register struct block *b;
- register int bot, top, half;
- struct blockvector *bl;
-
- if (symtab == 0) /* if no symtab specified by caller */
- {
- /* First search all symtabs for one whose file contains our pc */
- if ((symtab = find_pc_sect_symtab (pc, section)) == 0)
- return 0;
- }
-
- bl = BLOCKVECTOR (symtab);
- b = BLOCKVECTOR_BLOCK (bl, 0);
+ const struct block *b = block_for_pc_sect (pc, section);
- /* Then search that symtab for the smallest block that wins. */
- /* Use binary search to find the last block that starts before PC. */
-
- bot = 0;
- top = BLOCKVECTOR_NBLOCKS (bl);
-
- while (top - bot > 1)
- {
- half = (top - bot + 1) >> 1;
- b = BLOCKVECTOR_BLOCK (bl, bot + half);
- if (BLOCK_START (b) <= pc)
- bot += half;
- else
- top = bot + half;
- }
-
- /* Now search backward for a block that ends after PC. */
-
- while (bot >= 0)
- {
- b = BLOCKVECTOR_BLOCK (bl, bot);
- if (BLOCK_END (b) > pc)
- {
- if (pindex)
- *pindex = bot;
- return bl;
- }
- bot--;
- }
- return 0;
+ if (b == 0)
+ return 0;
+ return block_linkage_function (b);
}
-/* Return the blockvector immediately containing the innermost lexical block
- containing the specified pc value, or 0 if there is none.
- Backward compatibility, no section. */
+/* Return the function containing pc value PC.
+ Returns 0 if function is not known.
+ Backward compatibility, no section */
-struct blockvector *
-blockvector_for_pc (pc, pindex)
- register CORE_ADDR pc;
- int *pindex;
+struct symbol *
+find_pc_function (CORE_ADDR pc)
{
- return blockvector_for_pc_sect (pc, find_pc_mapped_section (pc),
- pindex, NULL);
+ return find_pc_sect_function (pc, find_pc_mapped_section (pc));
}
-/* Return the innermost lexical block containing the specified pc value
- in the specified section, or 0 if there is none. */
+/* See symtab.h. */
-struct block *
-block_for_pc_sect (pc, section)
- register CORE_ADDR pc;
- struct sec *section;
+struct symbol *
+find_pc_sect_containing_function (CORE_ADDR pc, struct obj_section *section)
{
- register struct blockvector *bl;
- int index;
-
- bl = blockvector_for_pc_sect (pc, section, &index, NULL);
- if (bl)
- return BLOCKVECTOR_BLOCK (bl, index);
- return 0;
-}
+ const block *bl = block_for_pc_sect (pc, section);
-/* Return the innermost lexical block containing the specified pc value,
- or 0 if there is none. Backward compatibility, no section. */
+ if (bl == nullptr)
+ return nullptr;
-struct block *
-block_for_pc (pc)
- register CORE_ADDR pc;
-{
- return block_for_pc_sect (pc, find_pc_mapped_section (pc));
+ return block_containing_function (bl);
}
-/* Return the function containing pc value PC in section SECTION.
- Returns 0 if function is not known. */
+/* These variables are used to cache the most recent result of
+ find_pc_partial_function.
-struct symbol *
-find_pc_sect_function (pc, section)
- CORE_ADDR pc;
- struct sec *section;
-{
- register struct block *b = block_for_pc_sect (pc, section);
- if (b == 0)
- return 0;
- return block_function (b);
-}
+ The addresses cache_pc_function_low and cache_pc_function_high
+ record the range in which PC was found during the most recent
+ successful lookup. When the function occupies a single contiguous
+ address range, these values correspond to the low and high
+ addresses of the function. (The high address is actually one byte
+ beyond the last byte of the function.) For a function with more
+ than one (non-contiguous) range, the range in which PC was found is
+ used to set the cache bounds.
-/* Return the function containing pc value PC.
- Returns 0 if function is not known. Backward compatibility, no section */
+ When determining whether or not these cached values apply to a
+ particular PC value, PC must be within the range specified by
+ cache_pc_function_low and cache_pc_function_high. In addition to
+ PC being in that range, cache_pc_section must also match PC's
+ section. See find_pc_partial_function() for details on both the
+ comparison as well as how PC's section is determined.
-struct symbol *
-find_pc_function (pc)
- CORE_ADDR pc;
-{
- return find_pc_sect_function (pc, find_pc_mapped_section (pc));
-}
-
-/* These variables are used to cache the most recent result
- * of find_pc_partial_function. */
+ The other values aren't used for determining whether the cache
+ applies, but are used for setting the outputs from
+ find_pc_partial_function. cache_pc_function_low and
+ cache_pc_function_high are used to set outputs as well. */
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 const char *cache_pc_function_name = 0;
+static struct obj_section *cache_pc_function_section = NULL;
+static const struct block *cache_pc_function_block = nullptr;
-/* Clear cache, e.g. when symbol table is discarded. */
+/* Clear cache, e.g. when symbol table is discarded. */
void
-clear_pc_function_cache ()
+clear_pc_function_cache (void)
{
cache_pc_function_low = 0;
cache_pc_function_high = 0;
cache_pc_function_name = (char *) 0;
cache_pc_function_section = NULL;
+ cache_pc_function_block = nullptr;
}
-/* Finds the "function" (text symbol) that is smaller than PC but
- greatest of all of the potential text symbols in SECTION. Sets
- *NAME and/or *ADDRESS conditionally if that pointer is non-null.
- If ENDADDR is non-null, then set *ENDADDR to be the end of the
- function (exclusive), but passing ENDADDR as non-null means that
- the function might cause symbols to be read. This function either
- succeeds or fails (not halfway succeeds). If it succeeds, it sets
- *NAME, *ADDRESS, and *ENDADDR to real information and returns 1.
- If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and
- returns 0. */
-
-int
-find_pc_sect_partial_function (pc, section, name, address, endaddr)
- CORE_ADDR pc;
- asection *section;
- char **name;
- CORE_ADDR *address;
- CORE_ADDR *endaddr;
+/* See symtab.h. */
+
+bool
+find_pc_partial_function (CORE_ADDR pc, const char **name, CORE_ADDR *address,
+ CORE_ADDR *endaddr, const struct block **block)
{
- struct partial_symtab *pst;
+ struct obj_section *section;
struct symbol *f;
- struct minimal_symbol *msymbol;
- struct partial_symbol *psb;
- struct obj_section *osect;
- int i;
+ struct bound_minimal_symbol msymbol;
+ struct compunit_symtab *compunit_symtab = NULL;
CORE_ADDR mapped_pc;
+ /* To ensure that the symbol returned belongs to the correct section
+ (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 &&
- mapped_pc < cache_pc_function_high &&
- section == cache_pc_function_section)
+ if (mapped_pc >= cache_pc_function_low
+ && mapped_pc < cache_pc_function_high
+ && 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 defined SIGTRAMP_START
- if (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;
- }
-#endif
-
msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section);
- pst = find_pc_sect_psymtab (mapped_pc, section);
- if (pst)
+ for (objfile *objfile : current_program_space->objfiles ())
{
- /* Need to read the symbols to get a good value for the end address. */
- if (endaddr != NULL && !pst->readin)
+ if (objfile->sf)
{
- /* Need to get the terminal in case symbol-reading produces
- output. */
- target_terminal_ours_for_output ();
- PSYMTAB_TO_SYMTAB (pst);
+ compunit_symtab
+ = objfile->sf->qf->find_pc_sect_compunit_symtab (objfile, msymbol,
+ mapped_pc,
+ section,
+ 0);
}
+ if (compunit_symtab != NULL)
+ break;
+ }
- if (pst->readin)
+ if (compunit_symtab != NULL)
+ {
+ /* Checking whether the msymbol has a larger value is for the
+ "pathological" case mentioned in stack.c:find_frame_funname.
+
+ We use BLOCK_ENTRY_PC instead of BLOCK_START_PC for this
+ comparison because the minimal symbol should refer to the
+ function's entry pc which is not necessarily the lowest
+ address of the function. This will happen when the function
+ has more than one range and the entry pc is not within the
+ lowest range of addresses. */
+ f = find_pc_sect_function (mapped_pc, section);
+ if (f != NULL
+ && (msymbol.minsym == NULL
+ || (BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (f))
+ >= BMSYMBOL_VALUE_ADDRESS (msymbol))))
{
- /* 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))))
+ const struct block *b = SYMBOL_BLOCK_VALUE (f);
+
+ cache_pc_function_name = f->linkage_name ();
+ cache_pc_function_section = section;
+ cache_pc_function_block = b;
+
+ /* For blocks occupying contiguous addresses (i.e. no gaps),
+ the low and high cache addresses are simply the start
+ and end of the block.
+
+ For blocks with non-contiguous ranges, we have to search
+ for the range containing mapped_pc and then use the start
+ and end of that range.
+
+ This causes the returned *ADDRESS and *ENDADDR values to
+ be limited to the range in which mapped_pc is found. See
+ comment preceding declaration of find_pc_partial_function
+ in symtab.h for more information. */
+
+ if (BLOCK_CONTIGUOUS_P (b))
{
- 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_NAME (f);
- cache_pc_function_section = section;
- goto return_cached_value;
+ cache_pc_function_low = BLOCK_START (b);
+ cache_pc_function_high = BLOCK_END (b);
}
- }
- else
- {
- /* 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))))
+ else
{
- /* This case isn't being cached currently. */
- if (address)
- *address = SYMBOL_VALUE_ADDRESS (psb);
- if (name)
- *name = SYMBOL_NAME (psb);
- /* endaddr non-NULL can't happen here. */
- return 1;
+ int i;
+ for (i = 0; i < BLOCK_NRANGES (b); i++)
+ {
+ if (BLOCK_RANGE_START (b, i) <= mapped_pc
+ && mapped_pc < BLOCK_RANGE_END (b, i))
+ {
+ cache_pc_function_low = BLOCK_RANGE_START (b, i);
+ cache_pc_function_high = BLOCK_RANGE_END (b, i);
+ break;
+ }
+ }
+ /* Above loop should exit via the break. */
+ gdb_assert (i < BLOCK_NRANGES (b));
}
+
+
+ goto return_cached_value;
}
}
- /* Not in the normal symbol tables, see if the pc is in a known section.
- If it's not, then give up. This ensures that anything beyond the end
- of the text seg doesn't appear to be part of the last function in the
- text segment. */
+ /* Not in the normal symbol tables, see if the pc is in a known
+ section. If it's not, then give up. This ensures that anything
+ beyond the end 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)
- msymbol = NULL;
+ if (!section)
+ msymbol.minsym = NULL;
/* Must be in the minimal symbol table. */
- if (msymbol == NULL)
+ if (msymbol.minsym == NULL)
{
/* No available symbol. */
if (name != NULL)
*address = 0;
if (endaddr != NULL)
*endaddr = 0;
- return 0;
+ if (block != nullptr)
+ *block = nullptr;
+ return false;
}
- cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
- cache_pc_function_name = SYMBOL_NAME (msymbol);
+ cache_pc_function_low = BMSYMBOL_VALUE_ADDRESS (msymbol);
+ cache_pc_function_name = msymbol.minsym->linkage_name ();
cache_pc_function_section = section;
+ cache_pc_function_high = minimal_symbol_upper_bound (msymbol);
+ cache_pc_function_block = nullptr;
- /* 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. */
-
- for (i = 1; SYMBOL_NAME (msymbol + i) != NULL; i++)
- {
- if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol)
- && SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol))
- break;
- }
-
- if (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;
-
-return_cached_value:
+ return_cached_value:
if (address)
{
{
/* Because the high address is actually beyond the end of
the function (and therefore possibly beyond the end of
- the overlay), we must actually convert (high - 1)
- and then add one to that. */
+ the overlay), we must actually convert (high - 1) and
+ then add one to that. */
*endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1,
section);
*endaddr = cache_pc_function_high;
}
- return 1;
-}
-
-/* Backward compatibility, no section argument */
-
-int
-find_pc_partial_function (pc, name, address, endaddr)
- CORE_ADDR pc;
- char **name;
- CORE_ADDR *address;
- CORE_ADDR *endaddr;
-{
- asection *section;
+ if (block != nullptr)
+ *block = cache_pc_function_block;
- section = find_pc_overlay (pc);
- return find_pc_sect_partial_function (pc, section, name, address, endaddr);
+ return true;
}
-/* Return the innermost stack frame executing inside of BLOCK,
- or NULL if there is no such frame. If BLOCK is NULL, just return NULL. */
+/* See symtab.h. */
-struct frame_info *
-block_innermost_frame (block)
- struct block *block;
+bool
+find_function_entry_range_from_pc (CORE_ADDR pc, const char **name,
+ CORE_ADDR *address, CORE_ADDR *endaddr)
{
- struct frame_info *frame;
- register CORE_ADDR start;
- register CORE_ADDR end;
-
- if (block == NULL)
- return NULL;
-
- start = BLOCK_START (block);
- end = BLOCK_END (block);
+ const struct block *block;
+ bool status = find_pc_partial_function (pc, name, address, endaddr, &block);
- frame = NULL;
- while (1)
+ if (status && block != nullptr && !BLOCK_CONTIGUOUS_P (block))
{
- frame = get_prev_frame (frame);
- if (frame == NULL)
- return NULL;
- if (frame->pc >= start && frame->pc < end)
- return frame;
- }
-}
+ CORE_ADDR entry_pc = BLOCK_ENTRY_PC (block);
-/* Return the full FRAME which corresponds to the given CORE_ADDR
- or NULL if no FRAME on the chain corresponds to CORE_ADDR. */
+ for (int i = 0; i < BLOCK_NRANGES (block); i++)
+ {
+ if (BLOCK_RANGE_START (block, i) <= entry_pc
+ && entry_pc < BLOCK_RANGE_END (block, i))
+ {
+ if (address != nullptr)
+ *address = BLOCK_RANGE_START (block, i);
-struct frame_info *
-find_frame_addr_in_frame_chain (frame_addr)
- CORE_ADDR frame_addr;
-{
- struct frame_info *frame = NULL;
+ if (endaddr != nullptr)
+ *endaddr = BLOCK_RANGE_END (block, i);
- if (frame_addr == (CORE_ADDR) 0)
- return NULL;
+ return status;
+ }
+ }
- while (1)
- {
- frame = get_prev_frame (frame);
- if (frame == NULL)
- return NULL;
- if (FRAME_FP (frame) == frame_addr)
- return frame;
+ /* It's an internal error if we exit the above loop without finding
+ the range. */
+ internal_error (__FILE__, __LINE__,
+ _("Entry block not found in find_function_entry_range_from_pc"));
}
-}
-#ifdef SIGCONTEXT_PC_OFFSET
-/* Get saved user PC for sigtramp from sigcontext for BSD style sigtramp. */
-
-CORE_ADDR
-sigtramp_saved_pc (frame)
- struct frame_info *frame;
-{
- CORE_ADDR sigcontext_addr;
- char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
- int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT;
- int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
-
- /* Get sigcontext address, it is the third parameter on the stack. */
- if (frame->next)
- sigcontext_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next)
- + FRAME_ARGS_SKIP
- + sigcontext_offs,
- ptrbytes);
- else
- sigcontext_addr = read_memory_integer (read_register (SP_REGNUM)
- + sigcontext_offs,
- ptrbytes);
-
- /* Don't cause a memory_error when accessing sigcontext in case the stack
- layout has changed or the stack is corrupt. */
- target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes);
- return extract_unsigned_integer (buf, ptrbytes);
+ return status;
}
-#endif /* SIGCONTEXT_PC_OFFSET */
-
-
-/* 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. */
-extern CORE_ADDR text_end;
+/* See symtab.h. */
-int
-pc_in_call_dummy_before_text_end (pc, sp, frame_address)
- CORE_ADDR pc;
- CORE_ADDR sp;
- CORE_ADDR frame_address;
+struct type *
+find_function_type (CORE_ADDR pc)
{
- return ((pc) >= text_end - CALL_DUMMY_LENGTH
- && (pc) <= text_end + DECR_PC_AFTER_BREAK);
-}
+ struct symbol *sym = find_pc_function (pc);
-int
-pc_in_call_dummy_after_text_end (pc, sp, frame_address)
- CORE_ADDR pc;
- CORE_ADDR sp;
- CORE_ADDR frame_address;
-{
- return ((pc) >= text_end
- && (pc) <= text_end + CALL_DUMMY_LENGTH + DECR_PC_AFTER_BREAK);
-}
-
-/* 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 FP_REGNUM (or the saved values thereof), respectively,
- are the things to pass.
-
- This won't work on the 29k, where SP_REGNUM and 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
- 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
-pc_in_call_dummy_on_stack (pc, sp, frame_address)
- CORE_ADDR pc;
- CORE_ADDR sp;
- CORE_ADDR frame_address;
-{
- return (INNER_THAN ((sp), (pc))
- && (frame_address != 0)
- && INNER_THAN ((pc), (frame_address)));
-}
-
-int
-pc_in_call_dummy_at_entry_point (pc, sp, frame_address)
- CORE_ADDR pc;
- CORE_ADDR sp;
- CORE_ADDR frame_address;
-{
- return ((pc) >= CALL_DUMMY_ADDRESS ()
- && (pc) <= (CALL_DUMMY_ADDRESS () + DECR_PC_AFTER_BREAK));
-}
-
-
-/*
- * GENERIC DUMMY FRAMES
- *
- * The following code serves to maintain the dummy stack frames for
- * inferior function calls (ie. when gdb calls into the inferior via
- * call_function_by_hand). This code saves the machine state before
- * the call in host memory, so we must maintain an independant stack
- * and keep it consistant etc. I am attempting to make this code
- * generic enough to be used by many targets.
- *
- * The cheapest and most generic way to do CALL_DUMMY on a new target
- * is probably to define CALL_DUMMY to be empty, CALL_DUMMY_LENGTH to
- * zero, and CALL_DUMMY_LOCATION to AT_ENTRY. Then you must remember
- * to define PUSH_RETURN_ADDRESS, because no call instruction will be
- * being executed by the target. Also FRAME_CHAIN_VALID as
- * generic_frame_chain_valid and FIX_CALL_DUMMY as
- * generic_fix_call_dummy. */
-
-/* Dummy frame. This saves the processor state just prior to setting
- up the inferior function call. Older targets save the registers
- target stack (but that really slows down function calls). */
-
-struct dummy_frame
-{
- struct dummy_frame *next;
-
- CORE_ADDR pc;
- CORE_ADDR fp;
- CORE_ADDR sp;
- CORE_ADDR top;
- char *registers;
-};
-
-static struct dummy_frame *dummy_frame_stack = NULL;
-
-/* Function: find_dummy_frame(pc, fp, sp)
- Search the stack of dummy frames for one matching the given PC, FP and SP.
- This is the work-horse for pc_in_call_dummy and read_register_dummy */
-
-char *
-generic_find_dummy_frame (pc, fp)
- CORE_ADDR pc;
- CORE_ADDR fp;
-{
- struct dummy_frame *dummyframe;
-
- if (pc != entry_point_address ())
- return 0;
-
- for (dummyframe = dummy_frame_stack; dummyframe != NULL;
- dummyframe = dummyframe->next)
- if (fp == dummyframe->fp
- || fp == dummyframe->sp
- || fp == dummyframe->top)
- /* The frame in question lies between the saved fp and sp, inclusive */
- return dummyframe->registers;
+ if (sym != NULL && BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (sym)) == pc)
+ return SYMBOL_TYPE (sym);
- return 0;
+ return NULL;
}
-/* Function: pc_in_call_dummy (pc, fp)
- Return true if this is a dummy frame created by gdb for an inferior call */
+/* See symtab.h. */
-int
-generic_pc_in_call_dummy (pc, sp, fp)
- CORE_ADDR pc;
- CORE_ADDR sp;
- CORE_ADDR fp;
-{
- /* if find_dummy_frame succeeds, then PC is in a call dummy */
- /* Note: SP and not FP is passed on. */
- return (generic_find_dummy_frame (pc, sp) != 0);
-}
-
-/* Function: read_register_dummy
- Find a saved register from before GDB calls a function in the inferior */
-
-CORE_ADDR
-generic_read_register_dummy (pc, fp, regno)
- CORE_ADDR pc;
- CORE_ADDR fp;
- int regno;
-{
- char *dummy_regs = generic_find_dummy_frame (pc, fp);
-
- if (dummy_regs)
- return extract_address (&dummy_regs[REGISTER_BYTE (regno)],
- REGISTER_RAW_SIZE (regno));
- else
- return 0;
-}
-
-/* Save all the registers on the dummy frame stack. Most ports save the
- registers on the target stack. This results in lots of unnecessary memory
- references, which are slow when debugging via a serial line. Instead, we
- save all the registers internally, and never write them to the stack. The
- registers get restored when the called function returns to the entry point,
- where a breakpoint is laying in wait. */
-
-void
-generic_push_dummy_frame ()
-{
- struct dummy_frame *dummy_frame;
- CORE_ADDR fp = (get_current_frame ())->frame;
-
- /* check to see if there are stale dummy frames,
- perhaps left over from when a longjump took us out of a
- function that was called by the debugger */
-
- dummy_frame = dummy_frame_stack;
- while (dummy_frame)
- if (INNER_THAN (dummy_frame->fp, fp)) /* stale -- destroy! */
- {
- dummy_frame_stack = dummy_frame->next;
- free (dummy_frame->registers);
- free (dummy_frame);
- dummy_frame = dummy_frame_stack;
- }
- else
- dummy_frame = dummy_frame->next;
-
- dummy_frame = xmalloc (sizeof (struct dummy_frame));
- dummy_frame->registers = xmalloc (REGISTER_BYTES);
-
- dummy_frame->pc = read_register (PC_REGNUM);
- dummy_frame->sp = read_register (SP_REGNUM);
- dummy_frame->top = dummy_frame->sp;
- dummy_frame->fp = fp;
- read_register_bytes (0, dummy_frame->registers, REGISTER_BYTES);
- dummy_frame->next = dummy_frame_stack;
- dummy_frame_stack = dummy_frame;
-}
-
-void
-generic_save_dummy_frame_tos (sp)
- CORE_ADDR sp;
-{
- dummy_frame_stack->top = sp;
-}
-
-/* Function: pop_frame
- Restore the machine state from either the saved dummy stack or a
- real stack frame. */
-
-void
-generic_pop_current_frame (pop)
- void (*pop) (struct frame_info * frame);
-{
- struct frame_info *frame = get_current_frame ();
- if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
- generic_pop_dummy_frame ();
- else
- pop (frame);
-}
-
-/* Function: pop_dummy_frame
- Restore the machine state from a saved dummy stack frame. */
-
-void
-generic_pop_dummy_frame ()
+struct type *
+find_gnu_ifunc_target_type (CORE_ADDR resolver_funaddr)
{
- struct dummy_frame *dummy_frame = dummy_frame_stack;
-
- /* FIXME: what if the first frame isn't the right one, eg..
- because one call-by-hand function has done a longjmp into another one? */
-
- if (!dummy_frame)
- error ("Can't pop dummy frame!");
- dummy_frame_stack = dummy_frame->next;
- write_register_bytes (0, dummy_frame->registers, REGISTER_BYTES);
- flush_cached_frames ();
-
- free (dummy_frame->registers);
- free (dummy_frame);
-}
-
-/* Function: frame_chain_valid
- 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
-generic_frame_chain_valid (fp, fi)
- CORE_ADDR fp;
- struct frame_info *fi;
-{
- if (PC_IN_CALL_DUMMY (FRAME_SAVED_PC (fi), fp, fp))
- return 1; /* don't prune CALL_DUMMY frames */
- else /* fall back to default algorithm (see frame.h) */
- return (fp != 0
- && (INNER_THAN (fi->frame, fp) || fi->frame == fp)
- && !inside_entry_file (FRAME_SAVED_PC (fi)));
-}
+ struct type *resolver_type = find_function_type (resolver_funaddr);
+ if (resolver_type != NULL)
+ {
+ /* Get the return type of the resolver. */
+ struct type *resolver_ret_type
+ = check_typedef (TYPE_TARGET_TYPE (resolver_type));
-/* Function: fix_call_dummy
- Stub function. Generic dumy frames typically do not need to fix
- the frame being created */
+ /* If we found a pointer to function, then the resolved type
+ is the type of the pointed-to function. */
+ if (TYPE_CODE (resolver_ret_type) == TYPE_CODE_PTR)
+ {
+ struct type *resolved_type
+ = TYPE_TARGET_TYPE (resolver_ret_type);
+ if (TYPE_CODE (check_typedef (resolved_type)) == TYPE_CODE_FUNC)
+ return resolved_type;
+ }
+ }
-void
-generic_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p)
- char *dummy;
- CORE_ADDR pc;
- CORE_ADDR fun;
- int nargs;
- struct value **args;
- struct type *type;
- int gcc_p;
-{
- return;
+ return NULL;
}
-/* Function: get_saved_register
- Find register number REGNUM relative to FRAME and put its (raw,
- target format) contents in *RAW_BUFFER.
-
- Set *OPTIMIZED if the variable was optimized out (and thus can't be
- fetched). Note that this is never set to anything other than zero
- in this implementation.
-
- Set *LVAL to lval_memory, lval_register, or not_lval, depending on
- whether the value was fetched from memory, from a register, or in a
- strange and non-modifiable way (e.g. a frame pointer which was
- calculated rather than fetched). We will use not_lval for values
- fetched from generic dummy frames.
+/* Return the innermost stack frame that is executing inside of BLOCK and is
+ at least as old as the selected frame. Return NULL if there is no
+ such frame. If BLOCK is NULL, just return NULL. */
- Set *ADDRP to the address, either in memory on as a REGISTER_BYTE
- offset into the registers array. If the value is stored in a dummy
- frame, set *ADDRP to zero.
-
- To use this implementation, define a function called
- "get_saved_register" in your target code, which simply passes all
- of its arguments to this function.
-
- The argument RAW_BUFFER must point to aligned memory. */
-
-void
-generic_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
- char *raw_buffer;
- int *optimized;
- CORE_ADDR *addrp;
- struct frame_info *frame;
- int regnum;
- enum lval_type *lval;
+struct frame_info *
+block_innermost_frame (const struct block *block)
{
- if (!target_has_registers)
- error ("No registers.");
-
- /* Normal systems don't optimize out things with register numbers. */
- if (optimized != NULL)
- *optimized = 0;
-
- if (addrp) /* default assumption: not found in memory */
- *addrp = 0;
+ struct frame_info *frame;
- /* Note: since the current frame's registers could only have been
- saved by frames INTERIOR TO the current frame, we skip examining
- the current frame itself: otherwise, we would be getting the
- previous frame's registers which were saved by the current frame. */
+ if (block == NULL)
+ return NULL;
- while (frame && ((frame = frame->next) != NULL))
+ frame = get_selected_frame_if_set ();
+ if (frame == NULL)
+ frame = get_current_frame ();
+ while (frame != NULL)
{
- if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
- {
- if (lval) /* found it in a CALL_DUMMY frame */
- *lval = not_lval;
- if (raw_buffer)
- memcpy (raw_buffer,
- generic_find_dummy_frame (frame->pc, frame->frame) +
- REGISTER_BYTE (regnum),
- REGISTER_RAW_SIZE (regnum));
- return;
- }
+ const struct block *frame_block = get_frame_block (frame, NULL);
+ if (frame_block != NULL && contained_in (frame_block, block))
+ return frame;
- FRAME_INIT_SAVED_REGS (frame);
- if (frame->saved_regs != NULL
- && frame->saved_regs[regnum] != 0)
- {
- if (lval) /* found it saved on the stack */
- *lval = lval_memory;
- if (regnum == SP_REGNUM)
- {
- if (raw_buffer) /* SP register treated specially */
- store_address (raw_buffer, REGISTER_RAW_SIZE (regnum),
- frame->saved_regs[regnum]);
- }
- else
- {
- if (addrp) /* any other register */
- *addrp = frame->saved_regs[regnum];
- if (raw_buffer)
- read_memory (frame->saved_regs[regnum], raw_buffer,
- REGISTER_RAW_SIZE (regnum));
- }
- return;
- }
+ frame = get_prev_frame (frame);
}
- /* If we get thru the loop to this point, it means the register was
- not saved in any frame. Return the actual live-register value. */
-
- if (lval) /* found it in a live register */
- *lval = lval_register;
- if (addrp)
- *addrp = REGISTER_BYTE (regnum);
- if (raw_buffer)
- read_register_gen (regnum, raw_buffer);
-}
-
-void
-_initialize_blockframe (void)
-{
- obstack_init (&frame_cache_obstack);
+ return NULL;
}
projects / deliverable / binutils-gdb.git / blobdiff