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authorAndrew Cagney <cagney@redhat.com>2002-12-13 16:40:25 +0000
committerAndrew Cagney <cagney@redhat.com>2002-12-13 16:40:25 +0000
commitc689142becccac9fa3b1f9833243048a50396ffe (patch)
treededb68db325ddaa0f88cde3003ff3a6413962c22 /gdb
parent18ea5ba4f05d572ec1513a37c22544c6037b21fa (diff)
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2002-12-13 Andrew Cagney <ac131313@redhat.com>
* frame.h (frame_id_unwind): Declare. (struct frame_info): Add fields id_unwind, id_unwind_cache_p and id_unwind_cache. (frame_id_unwind_ftype): Declare. * frame.c (frame_id_unwind): New function. (set_unwind_by_pc): Add unwind_id parameter. Initialized. (create_new_frame, get_prev_frame): Pass id_unwind to set_unwind_by_pc. (frame_saved_regs_id_unwind): New function. (frame_saved_regs_id_unwind): New function. * dummy-frame.c (dummy_frame_id_unwind): New function. (struct dummy_frame): Add field id. (generic_push_dummy_frame): Initialize `id'. * dummy-frame.h (dummy_frame_id_unwind): Declare.
Diffstat (limited to 'gdb')
-rw-r--r--gdb/ChangeLog17
-rw-r--r--gdb/dummy-frame.c16
-rw-r--r--gdb/dummy-frame.h6
-rw-r--r--gdb/frame.c85
-rw-r--r--gdb/frame.h16
5 files changed, 137 insertions, 3 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index f789563..bd4af6a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,22 @@
2002-12-13 Andrew Cagney <ac131313@redhat.com>
+ * frame.h (frame_id_unwind): Declare.
+ (struct frame_info): Add fields id_unwind, id_unwind_cache_p and
+ id_unwind_cache.
+ (frame_id_unwind_ftype): Declare.
+ * frame.c (frame_id_unwind): New function.
+ (set_unwind_by_pc): Add unwind_id parameter. Initialized.
+ (create_new_frame, get_prev_frame): Pass id_unwind to
+ set_unwind_by_pc.
+ (frame_saved_regs_id_unwind): New function.
+ (frame_saved_regs_id_unwind): New function.
+ * dummy-frame.c (dummy_frame_id_unwind): New function.
+ (struct dummy_frame): Add field id.
+ (generic_push_dummy_frame): Initialize `id'.
+ * dummy-frame.h (dummy_frame_id_unwind): Declare.
+
+2002-12-13 Andrew Cagney <ac131313@redhat.com>
+
* infcmd.c (run_stack_dummy): Create a frame ID directly and then
pass that to set_momentary_breakpoint. Move comments to where they
belong.
diff --git a/gdb/dummy-frame.c b/gdb/dummy-frame.c
index deed9c3..fab10c0 100644
--- a/gdb/dummy-frame.c
+++ b/gdb/dummy-frame.c
@@ -43,6 +43,7 @@ struct dummy_frame
CORE_ADDR fp;
CORE_ADDR sp;
CORE_ADDR top;
+ struct frame_id id;
struct regcache *regcache;
/* Address range of the call dummy code. Look for PC in the range
@@ -232,6 +233,7 @@ generic_push_dummy_frame (void)
dummy_frame->sp = read_sp ();
dummy_frame->top = 0;
dummy_frame->fp = fp;
+ dummy_frame->id = get_frame_id (get_current_frame ());
regcache_cpy (dummy_frame->regcache, current_regcache);
dummy_frame->next = dummy_frame_stack;
dummy_frame_stack = dummy_frame;
@@ -342,3 +344,17 @@ dummy_frame_pc_unwind (struct frame_info *frame,
return dummy->pc;
}
+
+struct frame_id
+dummy_frame_id_unwind (struct frame_info *frame,
+ void **cache)
+{
+ struct dummy_frame *dummy = cached_find_dummy_frame (frame, cache);
+ /* Oops! In a dummy-frame but can't find the stack dummy. Pretend
+ that the frame doesn't unwind. Should this function instead
+ return a has-no-caller indication? */
+ if (dummy == NULL)
+ return null_frame_id;
+ return dummy->id;
+}
+
diff --git a/gdb/dummy-frame.h b/gdb/dummy-frame.h
index 7f3aee8..cfa2709 100644
--- a/gdb/dummy-frame.h
+++ b/gdb/dummy-frame.h
@@ -60,6 +60,12 @@ extern void dummy_frame_register_unwind (struct frame_info *frame,
extern CORE_ADDR dummy_frame_pc_unwind (struct frame_info *frame,
void **unwind_cache);
+/* Assuming that FRAME is a dummy, return the ID of the calling frame
+ (the frame that the dummy has the saved state of). */
+
+extern struct frame_id dummy_frame_id_unwind (struct frame_info *frame,
+ void **unwind_cache);
+
/* Does the PC fall in a dummy frame?
This function is used by "frame.c" when creating a new `struct
diff --git a/gdb/frame.c b/gdb/frame.c
index 29ebfbe..b23d517 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -133,6 +133,19 @@ frame_pc_unwind (struct frame_info *frame)
return frame->pc_unwind_cache;
}
+struct frame_id
+frame_id_unwind (struct frame_info *frame)
+{
+ if (!frame->id_unwind_cache_p)
+ {
+ frame->id_unwind_cache =
+ frame->id_unwind (frame, &frame->unwind_cache);
+ frame->id_unwind_cache_p = 1;
+ }
+ return frame->id_unwind_cache;
+}
+
+
void
frame_register_unwind (struct frame_info *frame, int regnum,
int *optimizedp, enum lval_type *lvalp,
@@ -632,6 +645,68 @@ frame_saved_regs_pc_unwind (struct frame_info *frame, void **cache)
return FRAME_SAVED_PC (frame);
}
+static struct frame_id
+frame_saved_regs_id_unwind (struct frame_info *next_frame, void **cache)
+{
+ int fromleaf;
+ struct frame_id id;
+
+ if (next_frame->next == NULL)
+ /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
+ the frame chain, not just the inner most frame! The generic,
+ per-architecture, frame code should handle this and the below
+ should simply be removed. */
+ fromleaf = FRAMELESS_FUNCTION_INVOCATION (next_frame);
+ else
+ fromleaf = 0;
+
+ if (fromleaf)
+ /* A frameless inner-most frame. The `FP' (which isn't an
+ architecture frame-pointer register!) of the caller is the same
+ as the callee. */
+ /* FIXME: 2002-11-09: There isn't any reason to special case this
+ edge condition. Instead the per-architecture code should hande
+ it locally. */
+ id.base = get_frame_base (next_frame);
+ else
+ {
+ /* 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. */
+ id.base = FRAME_CHAIN (next_frame);
+
+ /* FIXME: cagney/2002-06-08: There should be two tests here.
+ The first would check for a valid frame chain based on a user
+ selectable policy. The default being ``stop at main'' (as
+ implemented by generic_func_frame_chain_valid()). Other
+ policies would be available - stop at NULL, .... The second
+ test, if provided by the target architecture, would check for
+ more exotic cases - most target architectures wouldn't bother
+ with this second case. */
+ if (!FRAME_CHAIN_VALID (id.base, next_frame))
+ return null_frame_id;
+ }
+ if (id.base == 0)
+ return null_frame_id;
+
+ /* FIXME: cagney/2002-06-08: This should probably return the frame's
+ function and not the PC (a.k.a. resume address). */
+ id.pc = frame_pc_unwind (next_frame);
+ return id;
+}
+
/* Function: get_saved_register
Find register number REGNUM relative to FRAME and put its (raw,
target format) contents in *RAW_BUFFER.
@@ -736,7 +811,8 @@ deprecated_generic_get_saved_register (char *raw_buffer, int *optimized,
static void
set_unwind_by_pc (CORE_ADDR pc, CORE_ADDR fp,
frame_register_unwind_ftype **unwind_register,
- frame_pc_unwind_ftype **unwind_pc)
+ frame_pc_unwind_ftype **unwind_pc,
+ frame_id_unwind_ftype **unwind_id)
{
if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES)
{
@@ -746,6 +822,7 @@ set_unwind_by_pc (CORE_ADDR pc, CORE_ADDR fp,
return vaguely correct values.. */
*unwind_register = frame_saved_regs_register_unwind;
*unwind_pc = frame_saved_regs_pc_unwind;
+ *unwind_id = frame_saved_regs_id_unwind;
}
else if (DEPRECATED_PC_IN_CALL_DUMMY_P ()
? DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0)
@@ -753,11 +830,13 @@ set_unwind_by_pc (CORE_ADDR pc, CORE_ADDR fp,
{
*unwind_register = dummy_frame_register_unwind;
*unwind_pc = dummy_frame_pc_unwind;
+ *unwind_id = dummy_frame_id_unwind;
}
else
{
*unwind_register = frame_saved_regs_register_unwind;
*unwind_pc = frame_saved_regs_pc_unwind;
+ *unwind_id = frame_saved_regs_id_unwind;
}
}
@@ -809,7 +888,7 @@ create_new_frame (CORE_ADDR addr, CORE_ADDR pc)
/* Select/initialize an unwind function. */
set_unwind_by_pc (fi->pc, fi->frame, &fi->register_unwind,
- &fi->pc_unwind);
+ &fi->pc_unwind, &fi->id_unwind);
return fi;
}
@@ -1064,7 +1143,7 @@ get_prev_frame (struct frame_info *next_frame)
check things like the debug info at that point (dwarf2cfi?) and
use that to decide how the frame should be unwound. */
set_unwind_by_pc (prev->pc, prev->frame, &prev->register_unwind,
- &prev->pc_unwind);
+ &prev->pc_unwind, &prev->id_unwind);
/* NOTE: cagney/2002-11-18: The code segments, found in
create_new_frame and get_prev_frame(), that initializes the
diff --git a/gdb/frame.h b/gdb/frame.h
index 5a45502..0fd305e 100644
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -298,6 +298,10 @@ extern const char *frame_map_regnum_to_name (int regnum);
extern CORE_ADDR frame_pc_unwind (struct frame_info *frame);
+/* Unwind the frame ID. Return an ID that uniquely identifies the
+ caller's frame. */
+extern struct frame_id frame_id_unwind (struct frame_info *frame);
+
/* Return the location (and possibly value) of REGNUM for the previous
(older, up) frame. All parameters except VALUEP can be assumed to
@@ -328,6 +332,12 @@ typedef void (frame_register_unwind_ftype) (struct frame_info *frame,
typedef CORE_ADDR (frame_pc_unwind_ftype) (struct frame_info *frame,
void **unwind_cache);
+/* Same as for registers above, but return the ID of the frame that
+ called this one. */
+
+typedef struct frame_info (frame_id_unwind_ftype) (struct frame_info *frame,
+ void **unwind_cache);
+
/* Describe the saved registers of a frame. */
#if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS)
@@ -424,6 +434,12 @@ struct frame_info
int pc_unwind_cache_p;
CORE_ADDR pc_unwind_cache;
+ /* See description above. The previous frame's resume address.
+ Save the previous PC in a local cache. */
+ frame_id_unwind_ftype *id_unwind;
+ int id_unwind_cache_p;
+ struct frame_id id_unwind_cache;
+
/* Pointers to the next (down, inner, younger) and previous (up,
outer, older) frame_info's in the frame cache. */
struct frame_info *next; /* down, inner, younger */