2004-11-08 Andrew Cagney <cagney@gnu.org>

[deliverable/binutils-gdb.git] / gdb / dwarf2-frame.h

diff --git a/gdb/dwarf2-frame.h b/gdb/dwarf2-frame.h
index 4b4c1a5ab2f4ca4cc9700b4b18f9cc2320de25ba..5191c0e8d497eab835a009d5992440611dc9480d 100644 (file)
--- a/gdb/dwarf2-frame.h
+++ b/gdb/dwarf2-frame.h
@@ -1,6 +1,6 @@
 /* Frame unwinder for frames with DWARF Call Frame Information.
 
-   Copyright 2003 Free Software Foundation, Inc.
+   Copyright 2003, 2004 Free Software Foundation, Inc.
 
    Contributed by Mark Kettenis.
 
@@ -24,17 +24,80 @@
 #ifndef DWARF2_FRAME_H
 #define DWARF2_FRAME_H 1
 
+struct gdbarch;
 struct objfile;
+struct frame_info;
+
+/* Register rule.  */
+
+enum dwarf2_frame_reg_rule
+{
+  /* Make certain that 0 maps onto the correct enum value; the
+     corresponding structure is being initialized using memset zero.
+     This indicates that CFI didn't provide any information at all
+     about a register, leaving how to obtain its value totally
+     unspecified.  */
+  DWARF2_FRAME_REG_UNSPECIFIED = 0,
+
+  /* The term "undefined" comes from the DWARF2 CFI spec which this
+     code is moddeling; it indicates that the register's value is
+     "undefined".  GCC uses the less formal term "unsaved".  Its
+     definition is a combination of REG_UNDEFINED and REG_UNSPECIFIED.
+     The failure to differentiate the two helps explain a few problems
+     with the CFI generated by GCC.  */
+  DWARF2_FRAME_REG_UNDEFINED,
+  DWARF2_FRAME_REG_SAVED_OFFSET,
+  DWARF2_FRAME_REG_SAVED_REG,
+  DWARF2_FRAME_REG_SAVED_EXP,
+  DWARF2_FRAME_REG_SAME_VALUE,
+
+  /* These aren't defined by the DWARF2 CFI specification, but are
+     used internally by GDB.  */
+  DWARF2_FRAME_REG_RA,         /* Return Address.  */
+  DWARF2_FRAME_REG_CFA         /* Call Frame Address.  */
+};
+
+/* Register state.  */
+
+struct dwarf2_frame_state_reg
+{
+  /* Each register save state can be described in terms of a CFA slot,
+     another register, or a location expression.  */
+  union {
+    LONGEST offset;
+    ULONGEST reg;
+    unsigned char *exp;
+  } loc;
+  ULONGEST exp_len;
+  enum dwarf2_frame_reg_rule how;
+};
+
+/* Set the architecture-specific register state initialization
+   function for GDBARCH to INIT_REG.  */
+
+extern void dwarf2_frame_set_init_reg (struct gdbarch *gdbarch,
+                                      void (*init_reg) (struct gdbarch *, int,
+                                            struct dwarf2_frame_state_reg *));
+
+/* Set the architecture-specific signal trampoline recognition
+   function for GDBARCH to SIGNAL_FRAME_P.  */
+
+extern void
+  dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch,
+                                  int (*signal_frame_p) (struct gdbarch *,
+                                                         struct frame_info *));
 
 /* Return the frame unwind methods for the function that contains PC,
    or NULL if it can't be handled by DWARF CFI frame unwinder.  */
 
-const struct frame_unwind *dwarf2_frame_p (CORE_ADDR pc);
+extern const struct frame_unwind *
+  dwarf2_frame_sniffer (struct frame_info *next_frame);
 
 /* Return the frame base methods for the function that contains PC, or
    NULL if it can't be handled by the DWARF CFI frame unwinder.  */
 
-const struct frame_base *dwarf2_frame_base_p (CORE_ADDR pc);
+extern const struct frame_base *
+  dwarf2_frame_base_sniffer (struct frame_info *next_frame);
 
 /* Register the DWARF CFI for OBJFILE.  */