Make some dwarf_expr_context methods pure virtual
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.
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@ -1,3 +1,15 @@
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2016-10-21 Tom Tromey <tom@tromey.com>
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* dwarf2expr.h (class dwarf_expr_context)
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<get_frame_base, get_frame_cfa, get_tls_address, dwarf_call,
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push_dwarf_block_entry_value, get_addr_index, get_object_address>:
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Now pure virtual.
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* dwarf2-frame.c (class dwarf_expr_executor)
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<get_frame_base, get_frame_cfa, get_tls_address, dwarf_call,
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push_dwarf_block_entry_value, get_addr_index, get_object_address>:
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New methods.
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<invalid>: New method.
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2016-10-21 Tom Tromey <tom@tromey.com>
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* minsyms.h (minimal_symbol_reader::record_full): "copy_name" now
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@ -351,6 +351,50 @@ class dwarf_expr_executor : public dwarf_expr_context
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{
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read_memory (addr, buf, len);
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}
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void get_frame_base (const gdb_byte **start, size_t *length) OVERRIDE
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{
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invalid ("DW_OP_fbreg");
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}
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void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
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union call_site_parameter_u kind_u,
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int deref_size) OVERRIDE
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{
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invalid ("DW_OP_GNU_entry_value");
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}
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CORE_ADDR get_object_address () OVERRIDE
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{
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invalid ("DW_OP_push_object_address");
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}
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CORE_ADDR get_frame_cfa () OVERRIDE
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{
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invalid ("DW_OP_call_frame_cfa");
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}
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CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE
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{
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invalid ("DW_OP_form_tls_address");
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}
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void dwarf_call (cu_offset die_offset) OVERRIDE
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{
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invalid ("DW_OP_call*");
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}
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CORE_ADDR get_addr_index (unsigned int index)
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{
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invalid ("DW_OP_GNU_addr_index");
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}
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private:
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void invalid (const char *op) ATTRIBUTE_NORETURN
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{
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error (_("%s is invalid in this context"), op);
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}
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};
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static CORE_ADDR
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@ -156,16 +156,10 @@ struct dwarf_expr_context
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/* Return the location expression for the frame base attribute, in
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START and LENGTH. The result must be live until the current
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expression evaluation is complete. */
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virtual void get_frame_base (const gdb_byte **start, size_t *length)
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{
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error (_("%s is invalid in this context"), "DW_OP_fbreg");
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}
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virtual void get_frame_base (const gdb_byte **start, size_t *length) = 0;
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/* Return the CFA for the frame. */
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virtual CORE_ADDR get_frame_cfa ()
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{
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error (_("%s is invalid in this context"), "DW_OP_call_frame_cfa");
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}
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virtual CORE_ADDR get_frame_cfa () = 0;
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/* Return the PC for the frame. */
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virtual CORE_ADDR get_frame_pc ()
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@ -175,19 +169,13 @@ struct dwarf_expr_context
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/* Return the thread-local storage address for
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DW_OP_GNU_push_tls_address or DW_OP_form_tls_address. */
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virtual CORE_ADDR get_tls_address (CORE_ADDR offset)
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{
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error (_("%s is invalid in this context"), "DW_OP_form_tls_address");
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}
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virtual CORE_ADDR get_tls_address (CORE_ADDR offset) = 0;
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/* Execute DW_AT_location expression for the DWARF expression
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subroutine in the DIE at DIE_OFFSET in the CU. Do not touch
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STACK while it being passed to and returned from the called DWARF
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subroutine. */
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virtual void dwarf_call (cu_offset die_offset)
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{
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error (_("%s is invalid in this context"), "DW_OP_call*");
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}
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virtual void dwarf_call (cu_offset die_offset) = 0;
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/* Return the base type given by the indicated DIE. This can throw
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an exception if the DIE is invalid or does not represent a base
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@ -206,26 +194,14 @@ struct dwarf_expr_context
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DW_AT_GNU_call_site_value. */
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virtual void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
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union call_site_parameter_u kind_u,
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int deref_size)
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{
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internal_error (__FILE__, __LINE__,
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_("Support for DW_OP_GNU_entry_value is unimplemented"));
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}
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int deref_size) = 0;
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/* Return the address indexed by DW_OP_GNU_addr_index.
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This can throw an exception if the index is out of range. */
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virtual CORE_ADDR get_addr_index (unsigned int index)
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{
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error (_("%s is invalid in this context"), "DW_OP_GNU_addr_index");
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}
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virtual CORE_ADDR get_addr_index (unsigned int index) = 0;
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/* Return the `object address' for DW_OP_push_object_address. */
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virtual CORE_ADDR get_object_address ()
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{
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internal_error (__FILE__, __LINE__,
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_("Support for DW_OP_push_object_address "
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"is unimplemented"));
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}
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virtual CORE_ADDR get_object_address () = 0;
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private:
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