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Make some dwarf_expr_context methods pure virtual

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This patch changes some dwarf_expr_context to be pure virtual, as
mentioned during the discussion of an earlier patch in this series.

2016-10-21  Tom Tromey  <tom@tromey.com>

	* dwarf2expr.h (class dwarf_expr_context)
	<get_frame_base, get_frame_cfa, get_tls_address, dwarf_call,
	push_dwarf_block_entry_value, get_addr_index, get_object_address>:
	Now pure virtual.
	* dwarf2-frame.c (class dwarf_expr_executor)
	<get_frame_base, get_frame_cfa, get_tls_address, dwarf_call,
	push_dwarf_block_entry_value, get_addr_index, get_object_address>:
	New methods.
	<invalid>: New method.
This commit is contained in:
Tom Tromey
2016-10-19 21:38:38 -06:00
parent ce6c454e5a
commit befbff861e
3 changed files with 63 additions and 31 deletions
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38
gdb/dwarf2expr.h
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@ -156,16 +156,10 @@ struct dwarf_expr_context
/* Return the location expression for the frame base attribute, in
START and LENGTH. The result must be live until the current
expression evaluation is complete. */
virtual void get_frame_base (const gdb_byte **start, size_t *length)
{
error (_("%s is invalid in this context"), "DW_OP_fbreg");
}
virtual void get_frame_base (const gdb_byte **start, size_t *length) = 0;
/* Return the CFA for the frame. */
virtual CORE_ADDR get_frame_cfa ()
{
error (_("%s is invalid in this context"), "DW_OP_call_frame_cfa");
}
virtual CORE_ADDR get_frame_cfa () = 0;
/* Return the PC for the frame. */
virtual CORE_ADDR get_frame_pc ()
@ -175,19 +169,13 @@ struct dwarf_expr_context
/* Return the thread-local storage address for
DW_OP_GNU_push_tls_address or DW_OP_form_tls_address. */
virtual CORE_ADDR get_tls_address (CORE_ADDR offset)
{
error (_("%s is invalid in this context"), "DW_OP_form_tls_address");
}
virtual CORE_ADDR get_tls_address (CORE_ADDR offset) = 0;
/* Execute DW_AT_location expression for the DWARF expression
subroutine in the DIE at DIE_OFFSET in the CU. Do not touch
STACK while it being passed to and returned from the called DWARF
subroutine. */
virtual void dwarf_call (cu_offset die_offset)
{
error (_("%s is invalid in this context"), "DW_OP_call*");
}
virtual void dwarf_call (cu_offset die_offset) = 0;
/* Return the base type given by the indicated DIE. This can throw
an exception if the DIE is invalid or does not represent a base
@ -206,26 +194,14 @@ struct dwarf_expr_context
DW_AT_GNU_call_site_value. */
virtual void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
union call_site_parameter_u kind_u,
int deref_size)
{
internal_error (__FILE__, __LINE__,
_("Support for DW_OP_GNU_entry_value is unimplemented"));
}
int deref_size) = 0;
/* Return the address indexed by DW_OP_GNU_addr_index.
This can throw an exception if the index is out of range. */
virtual CORE_ADDR get_addr_index (unsigned int index)
{
error (_("%s is invalid in this context"), "DW_OP_GNU_addr_index");
}
virtual CORE_ADDR get_addr_index (unsigned int index) = 0;
/* Return the `object address' for DW_OP_push_object_address. */
virtual CORE_ADDR get_object_address ()
{
internal_error (__FILE__, __LINE__,
_("Support for DW_OP_push_object_address "
"is unimplemented"));
}
virtual CORE_ADDR get_object_address () = 0;
private: