2004-02-14 Andrew Cagney <cagney@redhat.com>

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

diff --git a/gdb/dwarf2-frame.h b/gdb/dwarf2-frame.h
index c9c106ff0a9735afe97b9d6f15b178f2527b0c8c..b650a846a941668571ca91721a3409c0dbd3be3e 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.
 
@@ -27,15 +27,61 @@
 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;
+};
+
 /* 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_sniffer (struct frame_info *next_frame);
+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_sniffer (struct frame_info *next_frame);
+extern const struct frame_base *
+  dwarf2_frame_base_sniffer (struct frame_info *next_frame);
 
 /* Register the DWARF CFI for OBJFILE.  */