-/* Get info from stack frames;
- convert between frames, blocks, functions and pc values.
- Copyright (C) 1986, 1987, 1988 Free Software Foundation, Inc.
-
-GDB is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY. No author or distributor accepts responsibility to anyone
-for the consequences of using it or for whether it serves any
-particular purpose or works at all, unless he says so in writing.
-Refer to the GDB General Public License for full details.
-
-Everyone is granted permission to copy, modify and redistribute GDB,
-but only under the conditions described in the GDB General Public
-License. A copy of this license is supposed to have been given to you
-along with GDB so you can know your rights and responsibilities. It
-should be in a file named COPYING. Among other things, the copyright
-notice and this notice must be preserved on all copies.
-
-In other words, go ahead and share GDB, but don't try to stop
-anyone else from sharing it farther. Help stamp out software hoarding!
-*/
+/* Get info from stack frames; convert between frames, blocks,
+ functions and pc values.
-#include "defs.h"
-#include "initialize.h"
-#include "param.h"
-#include "symtab.h"
-#include "frame.h"
-
-/* Address of end of first object file.
- This file is assumed to be a startup file
- and frames with pc's inside it
- are treated as nonexistent. */
+ Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
+ 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008
+ Free Software Foundation, Inc.
-CORE_ADDR first_object_file_end;
+ This file is part of GDB.
-/* Address of innermost stack frame (contents of FP register) */
+ 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 3 of the License, or
+ (at your option) any later version.
-static FRAME current_frame;
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-struct block *block_for_pc ();
-CORE_ADDR get_pc_function_start ();
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-START_FILE
+#include "defs.h"
+#include "symtab.h"
+#include "bfd.h"
+#include "objfiles.h"
+#include "frame.h"
+#include "gdbcore.h"
+#include "value.h"
+#include "target.h"
+#include "inferior.h"
+#include "annotate.h"
+#include "regcache.h"
+#include "gdb_assert.h"
+#include "dummy-frame.h"
+#include "command.h"
+#include "gdbcmd.h"
+#include "block.h"
+
+/* Prototypes for exported functions. */
+
+void _initialize_blockframe (void);
-/* Return the innermost (currently executing) stack frame. */
+/* Return the innermost lexical block in execution
+ in a specified stack frame. The frame address is assumed valid.
-FRAME
-get_current_frame ()
-{
- /* We assume its address is kept in a general register;
- param.h says which register. */
+ 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.
- return current_frame;
-}
+ 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. */
-void
-set_current_frame (frame)
- FRAME frame;
+struct block *
+get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
{
- current_frame = frame;
-}
+ const CORE_ADDR pc = get_frame_address_in_block (frame);
-/* Return the frame that called FRAME.
- If FRAME is the original frame (it has no caller), return 0. */
+ if (addr_in_block)
+ *addr_in_block = pc;
-FRAME
-get_prev_frame (frame)
- FRAME frame;
-{
- CORE_ADDR pointer;
- /* The caller of "no frame" is the innermost frame. */
- if (frame == 0)
- return get_current_frame ();
-
- /* Two macros defined in param.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. */
- pointer = FRAME_CHAIN (frame);
- if (!FRAME_CHAIN_VALID (pointer, frame))
- return 0;
- /* If frame has a caller, combine the chain pointer and the frame's own
- address to get the address of the caller. */
- return FRAME_CHAIN_COMBINE (pointer, frame);
+ return block_for_pc (pc);
}
-/* Return a structure containing various interesting information
- about a specified stack frame. */
-
-struct frame_info
-get_frame_info (frame)
- FRAME frame;
+CORE_ADDR
+get_pc_function_start (CORE_ADDR pc)
{
- struct frame_info val;
- FRAME current = get_current_frame ();
- register FRAME frame1;
-
- val.frame = frame;
+ struct block *bl;
+ struct minimal_symbol *msymbol;
- if (frame == current)
+ bl = block_for_pc (pc);
+ if (bl)
{
- val.pc = read_pc ();
- val.next_frame = 0;
+ struct symbol *symbol = block_linkage_function (bl);
+
+ if (symbol)
+ {
+ bl = SYMBOL_BLOCK_VALUE (symbol);
+ return BLOCK_START (bl);
+ }
}
- else
+
+ msymbol = lookup_minimal_symbol_by_pc (pc);
+ if (msymbol)
{
- for (frame1 = current; frame1; frame1 = get_prev_frame (frame1))
- {
- QUIT;
- if (frame1 == frame)
- break;
+ CORE_ADDR fstart = SYMBOL_VALUE_ADDRESS (msymbol);
- val.pc = FRAME_SAVED_PC (frame1);
- val.next_frame = frame1;
- }
+ if (find_pc_section (fstart))
+ return fstart;
}
- return val;
+ return 0;
}
-/* Return a structure containing various interesting information
- about the frame that called FRAME.
-
- This is much faster than get_frame_info (get_prev_frame (FRAME))
- because it does not need to search the entire stack
- to find the frame called by the one being described -- that is FRAME. */
+/* Return the symbol for the function executing in frame FRAME. */
-struct frame_info
-get_prev_frame_info (next_frame)
- FRAME next_frame;
+struct symbol *
+get_frame_function (struct frame_info *frame)
{
- struct frame_info val;
- register FRAME frame = get_prev_frame (next_frame);
-
- val.frame = frame;
- val.next_frame = next_frame;
-
- if (next_frame == 0)
- {
- val.pc = read_pc ();
- }
- else
- {
- val.pc = FRAME_SAVED_PC (next_frame);
- }
-
- return val;
+ struct block *bl = get_frame_block (frame, 0);
+ if (bl == 0)
+ return 0;
+ return block_linkage_function (bl);
}
+\f
-CORE_ADDR
-get_frame_pc (frame)
- FRAME frame;
+/* 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)
{
- struct frame_info fi;
- fi = get_frame_info (frame);
- return fi.pc;
+ struct block *b = block_for_pc_sect (pc, section);
+ if (b == 0)
+ return 0;
+ return block_linkage_function (b);
}
-/* Find the addresses in which registers are saved in FRAME. */
+/* Return the function containing pc value PC.
+ Returns 0 if function is not known. Backward compatibility, no section */
-void
-get_frame_saved_regs (frame_info_addr, saved_regs_addr)
- struct frame_info *frame_info_addr;
- struct frame_saved_regs *saved_regs_addr;
+struct symbol *
+find_pc_function (CORE_ADDR pc)
{
- FRAME_FIND_SAVED_REGS (*frame_info_addr, *saved_regs_addr);
+ return find_pc_sect_function (pc, find_pc_mapped_section (pc));
}
-/* Return the innermost lexical block in execution
- in a specified stack frame. The frame address is assumed valid. */
+/* These variables are used to cache the most recent result
+ * of find_pc_partial_function. */
-struct block *
-get_frame_block (frame)
- FRAME frame;
-{
- struct frame_info fi;
+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 obj_section *cache_pc_function_section = NULL;
- fi = get_frame_info (frame);
- return block_for_pc (fi.pc);
-}
+/* Clear cache, e.g. when symbol table is discarded. */
-struct block *
-get_current_block ()
+void
+clear_pc_function_cache (void)
{
- return block_for_pc (read_pc ());
+ cache_pc_function_low = 0;
+ cache_pc_function_high = 0;
+ cache_pc_function_name = (char *) 0;
+ cache_pc_function_section = NULL;
}
-CORE_ADDR
-get_pc_function_start (pc)
- CORE_ADDR pc;
-{
- register struct block *bl = block_for_pc (pc);
- register struct symbol *symbol;
- if (bl == 0)
- {
- register int misc_index = find_pc_misc_function (pc);
- if (misc_index >= 0)
- return misc_function_vector[misc_index].address;
- return 0;
- }
- symbol = block_function (bl);
- bl = SYMBOL_BLOCK_VALUE (symbol);
- return BLOCK_START (bl);
-}
+/* 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. */
-/* Return the symbol for the function executing in frame FRAME. */
+/* Backward compatibility, no section argument. */
-struct symbol *
-get_frame_function (frame)
- FRAME frame;
+int
+find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address,
+ CORE_ADDR *endaddr)
{
- register struct block *bl = get_frame_block (frame);
- if (bl == 0)
- return 0;
- return block_function (bl);
-}
-\f
-/* Return the innermost lexical block containing the specified pc value,
- or 0 if there is none. */
+ struct obj_section *section;
+ struct partial_symtab *pst;
+ struct symbol *f;
+ struct minimal_symbol *msymbol;
+ struct partial_symbol *psb;
+ 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
+ && mapped_pc < cache_pc_function_high
+ && section == cache_pc_function_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)
+ {
+ /* 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);
+ }
-struct block *
-block_for_pc (pc)
- register CORE_ADDR pc;
-{
- register struct block *b;
- register int bot, top, half;
- register struct symtab *s;
- struct blockvector *bl;
+ 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 = SYMBOL_LINKAGE_NAME (f);
+ cache_pc_function_section = section;
+ goto return_cached_value;
+ }
+ }
+ 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))))
+ {
+ /* This case isn't being cached currently. */
+ if (address)
+ *address = SYMBOL_VALUE_ADDRESS (psb);
+ if (name)
+ *name = SYMBOL_LINKAGE_NAME (psb);
+ /* endaddr non-NULL can't happen here. */
+ return 1;
+ }
+ }
+ }
+
+ /* 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. */
- /* First search all symtabs for one whose file contains our pc */
+ if (!section)
+ msymbol = NULL;
- for (s = symtab_list; s; s = s->next)
+ /* Must be in the minimal symbol table. */
+ if (msymbol == NULL)
{
- bl = BLOCKVECTOR (s);
- b = BLOCKVECTOR_BLOCK (bl, 0);
- if (BLOCK_START (b) <= pc
- && BLOCK_END (b) > pc)
- break;
+ /* No available symbol. */
+ if (name != NULL)
+ *name = 0;
+ if (address != NULL)
+ *address = 0;
+ if (endaddr != NULL)
+ *endaddr = 0;
+ return 0;
}
- if (s == 0)
- return 0;
-
- /* Then search that symtab for the smallest block that wins. */
- /* Use binary search to find the last block that starts before PC. */
+ cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
+ cache_pc_function_name = SYMBOL_LINKAGE_NAME (msymbol);
+ cache_pc_function_section = section;
- bot = 0;
- top = BLOCKVECTOR_NBLOCKS (bl);
+ /* 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. */
- while (top - bot > 1)
+ if (MSYMBOL_SIZE (msymbol) != 0)
+ cache_pc_function_high = cache_pc_function_low + MSYMBOL_SIZE (msymbol);
+ else
{
- half = (top - bot + 1) >> 1;
- b = BLOCKVECTOR_BLOCK (bl, bot + half);
- if (BLOCK_START (b) <= pc)
- bot += half;
+ /* 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) != 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
- top = bot + half;
+ /* 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);
}
- /* Now search backward for a block that ends after PC. */
+ return_cached_value:
- while (bot >= 0)
+ if (address)
{
- b = BLOCKVECTOR_BLOCK (bl, bot);
- if (BLOCK_END (b) > pc)
- return b;
- bot--;
+ if (pc_in_unmapped_range (pc, section))
+ *address = overlay_unmapped_address (cache_pc_function_low, section);
+ else
+ *address = cache_pc_function_low;
}
- return 0;
-}
+ if (name)
+ *name = cache_pc_function_name;
-/* Return the function containing pc value PC.
- Returns 0 if function is not known. */
+ if (endaddr)
+ {
+ if (pc_in_unmapped_range (pc, section))
+ {
+ /* 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. */
-struct symbol *
-find_pc_function (pc)
- CORE_ADDR pc;
-{
- register struct block *b = block_for_pc (pc);
- if (b == 0)
- return 0;
- return block_function (b);
+ *endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1,
+ section);
+ }
+ else
+ *endaddr = cache_pc_function_high;
+ }
+
+ return 1;
}
-/* Find the misc function whose address is the largest
- while being less than PC. Return its index in misc_function_vector.
- Returns -1 if PC is not in suitable range. */
+/* Return the innermost stack frame executing inside of BLOCK,
+ or NULL if there is no such frame. If BLOCK is NULL, just return NULL. */
-int
-find_pc_misc_function (pc)
- register CORE_ADDR pc;
+struct frame_info *
+block_innermost_frame (struct block *block)
{
- register int lo = 0;
- register int hi = misc_function_count-1;
- register int new;
- register int distance;
-
- /* Note that the last thing in the vector is always _etext. */
-
- /* trivial reject range test */
- if (pc < misc_function_vector[0].address ||
- pc > misc_function_vector[hi].address)
- return -1;
-
- do {
- new = (lo + hi) >> 1;
- distance = misc_function_vector[new].address - pc;
- if (distance == 0)
- return new; /* an exact match */
- else if (distance > 0)
- hi = new;
- else
- lo = new;
- } while (hi-lo != 1);
-
- /* if here, we had no exact match, so return the lower choice */
- return lo;
-}
+ struct frame_info *frame;
+ CORE_ADDR start;
+ CORE_ADDR end;
+ CORE_ADDR calling_pc;
-/* Return the innermost stack frame executing inside of the specified block,
- or zero if there is no such frame. */
+ if (block == NULL)
+ return NULL;
-FRAME
-block_innermost_frame (block)
- struct block *block;
-{
- struct frame_info fi;
- register FRAME frame;
- register CORE_ADDR start = BLOCK_START (block);
- register CORE_ADDR end = BLOCK_END (block);
+ start = BLOCK_START (block);
+ end = BLOCK_END (block);
- frame = 0;
- while (1)
+ frame = get_current_frame ();
+ while (frame != NULL)
{
- fi = get_prev_frame_info (frame);
- frame = fi.frame;
- if (frame == 0)
- return 0;
- if (fi.pc >= start && fi.pc < end)
+ calling_pc = get_frame_address_in_block (frame);
+ if (calling_pc >= start && calling_pc < end)
return frame;
+
+ frame = get_prev_frame (frame);
}
-}
-static
-initialize ()
-{
+ return NULL;
}
-
-END_FILE
projects / deliverable / binutils-gdb.git / blobdiff