Fix dwarf2_string_attr for -gsplit-dwarf

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

diff --git a/gdb/dwarf2-frame.h b/gdb/dwarf2-frame.h
index dd03d590ccf3041f2a1701cbe2aaac62b5438870..9e8668ea7a1a265622335359bad94d8f05bd0937 100644 (file)
--- a/gdb/dwarf2-frame.h
+++ b/gdb/dwarf2-frame.h
@@ -1,7 +1,6 @@
 /* Frame unwinder for frames with DWARF Call Frame Information.
 
-   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009
-   Free Software Foundation, Inc.
+   Copyright (C) 2003-2017 Free Software Foundation, Inc.
 
    Contributed by Mark Kettenis.
 
@@ -26,6 +25,9 @@
 struct gdbarch;
 struct objfile;
 struct frame_info;
+struct dwarf2_per_cu_data;
+struct agent_expr;
+struct axs_value;
 
 /* Register rule.  */
 
@@ -72,7 +74,7 @@ struct dwarf2_frame_state_reg
   union {
     LONGEST offset;
     ULONGEST reg;
-    unsigned char *exp;
+    const gdb_byte *exp;
     struct value *(*fn) (struct frame_info *this_frame, void **this_cache,
                         int regnum);
   } loc;
@@ -80,6 +82,58 @@ struct dwarf2_frame_state_reg
   enum dwarf2_frame_reg_rule how;
 };
 
+enum cfa_how_kind
+{
+  CFA_UNSET,
+  CFA_REG_OFFSET,
+  CFA_EXP
+};
+
+struct dwarf2_frame_state_reg_info
+{
+  struct dwarf2_frame_state_reg *reg;
+  int num_regs;
+
+  LONGEST cfa_offset;
+  ULONGEST cfa_reg;
+  enum cfa_how_kind cfa_how;
+  const gdb_byte *cfa_exp;
+
+  /* Used to implement DW_CFA_remember_state.  */
+  struct dwarf2_frame_state_reg_info *prev;
+};
+
+/* Structure describing a frame state.  */
+
+struct dwarf2_frame_state
+{
+  /* Each register save state can be described in terms of a CFA slot,
+     another register, or a location expression.  */
+  struct dwarf2_frame_state_reg_info regs;
+
+  /* The PC described by the current frame state.  */
+  CORE_ADDR pc;
+
+  /* Initial register set from the CIE.
+     Used to implement DW_CFA_restore.  */
+  struct dwarf2_frame_state_reg_info initial;
+
+  /* The information we care about from the CIE.  */
+  LONGEST data_align;
+  ULONGEST code_align;
+  ULONGEST retaddr_column;
+
+  /* Flags for known producer quirks.  */
+
+  /* The ARM compilers, in DWARF2 mode, assume that DW_CFA_def_cfa
+     and DW_CFA_def_cfa_offset takes a factored offset.  */
+  int armcc_cfa_offsets_sf;
+
+  /* The ARM compilers, in DWARF2 or DWARF3 mode, may assume that
+     the CFA is defined as REG - OFFSET rather than REG + OFFSET.  */
+  int armcc_cfa_offsets_reversed;
+};
+
 /* Set the architecture-specific register state initialization
    function for GDBARCH to INIT_REG.  */
 
@@ -114,12 +168,36 @@ void dwarf2_append_unwinders (struct gdbarch *gdbarch);
 extern const struct frame_base *
   dwarf2_frame_base_sniffer (struct frame_info *this_frame);
 
-/* Register the DWARF CFI for OBJFILE.  */
-
-void dwarf2_frame_build_info (struct objfile *objfile);
-
 /* Compute the DWARF CFA for a frame.  */
 
 CORE_ADDR dwarf2_frame_cfa (struct frame_info *this_frame);
 
+/* Assert that the register set RS is large enough to store gdbarch_num_regs
+   columns.  If necessary, enlarge the register set.  */
+
+void dwarf2_frame_state_alloc_regs (struct dwarf2_frame_state_reg_info *rs,
+                                   int num_regs);
+
+/* Find the CFA information for PC.
+
+   Return 1 if a register is used for the CFA, or 0 if another
+   expression is used.  Throw an exception on error.
+
+   GDBARCH is the architecture to use.
+   DATA is the per-CU data.
+
+   REGNUM_OUT is an out parameter that is set to the register number.
+   OFFSET_OUT is the offset to use from this register.
+   These are only filled in when 1 is returned.
+
+   TEXT_OFFSET_OUT, CFA_START_OUT, and CFA_END_OUT describe the CFA
+   in other cases.  These are only used when 0 is returned.  */
+
+extern int dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc,
+                                 struct dwarf2_per_cu_data *data,
+                                 int *regnum_out, LONGEST *offset_out,
+                                 CORE_ADDR *text_offset_out,
+                                 const gdb_byte **cfa_start_out,
+                                 const gdb_byte **cfa_end_out);
+
 #endif /* dwarf2-frame.h */