diff options
Diffstat (limited to 'gdb/frame.c')
| -rw-r--r-- | gdb/frame.c | 85 |
1 files changed, 82 insertions, 3 deletions
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 |