Add dwarf2_per_objfile to dwarf_expr_context and dwarf2_frame_cache
Evaluating DWARF expressions (such as location expressions) requires knowing about the current objfile. For example, it may call functions like dwarf2_fetch_die_loc_sect_off, which currently obtain the dwarf2_per_objfile object it needs from the dwarf2_per_cu_data object. However, since we are going to remove this dwarf2_per_cu_data::dwarf2_per_objfile link, these functions will need to obtain the current dwarf2_per_objfile by parmeter. If we go up the stack, we see that the DWARF expression contexts (dwarf_expr_context and the classes that derive from it) need to store the dwarf2_per_objfile, to be able to pass it to those functions that will need it. This patch adds a constructor to all these dwarf_expr_context variants, accepting a dwarf2_per_objfile parameter. This dwarf2_per_objfile generally comes from a symbol baton created earlier. For frame-related expressions, the dwarf2_per_objfile object must be passed through the dwarf2_frame_cache object. This lead to the dwarf2_frame_find_fde function returning (by parameter) a dwarf2_per_objfile object. I then realized that this made the existing "out_offset" parameter redundant. This offset is `objfile->text_section_offset ()`, so it can be recomputed from the dwarf2_per_objfile object at any time. I therefore opted to remove this output parameter, as well as the offset field of dwarf2_frame_cache. *Note*, there's one spot I'm particularly unsure about. In dwarf_evaluate_loc_desc::push_dwarf_reg_entry_value, we would save and overwrite the offset value in the context, along with a bunch of other state. This is because we might be about to evaluate something in a different CU that the current one. If the two CUs are in the same objfile, then the text_offset is the same, as it's a property of the objfile. However, if the two CUs are possibly in different objfiles, then it means the text_offsets are different. It would also mean we would need to save and restore the dwarf2_per_objfile in the context. Is that even possible? gdb/ChangeLog: * dwarf2/expr.h (struct dwarf_expr_context) <dwarf_expr_context>: Add dwarf2_per_objfile parameter. <offset>: Remove. <per_objfile>: New member. * dwarf2/expr.c (dwarf_expr_context::dwarf_expr_context): Add dwarf2_per_objfile parameter. Don't set offset, set per_objfile. (dwarf_expr_context::execute_stack_op): Use offset from objfile. * dwarf2/frame.c (dwarf2_frame_find_fde): Return (by parameter) a dwarf2_per_objfile object instead of an offset. (class dwarf_expr_executor) <dwarf_expr_executor>: Add constructor. (execute_stack_op): Add dwarf2_per_objfile parameter, pass it to dwarf2_expr_executor constructor. Don't set offset. (dwarf2_fetch_cfa_info): Update. (struct dwarf2_frame_cache) <text_offset>: Remove. <per_objfile>: New field. (dwarf2_frame_cache): Update. (dwarf2_frame_prev_register): Update. * dwarf2/loc.c (class dwarf_evaluate_loc_desc) <dwarf_evaluate_loc_desc>: Add constructor. (dwarf2_evaluate_loc_desc_full): Update. (dwarf2_locexpr_baton_eval): Update. (class symbol_needs_eval_context) <symbol_needs_eval_context>: Add constructor. (dwarf2_loc_desc_get_symbol_read_needs): Update. Change-Id: I14df060669cc36ad04759f1708c6d7b1fda77727
This commit is contained in:
Simon Marchi
parent
293e7e5114
commit
89b07335fe
@ -1,3 +1,32 @@
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2020-05-27 Simon Marchi <simon.marchi@efficios.com>
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* dwarf2/expr.h (struct dwarf_expr_context)
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<dwarf_expr_context>: Add dwarf2_per_objfile parameter.
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<offset>: Remove.
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<per_objfile>: New member.
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* dwarf2/expr.c (dwarf_expr_context::dwarf_expr_context): Add
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dwarf2_per_objfile parameter. Don't set offset, set
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per_objfile.
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(dwarf_expr_context::execute_stack_op): Use offset from objfile.
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* dwarf2/frame.c (dwarf2_frame_find_fde): Return (by parameter)
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a dwarf2_per_objfile object instead of an offset.
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(class dwarf_expr_executor) <dwarf_expr_executor>: Add
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constructor.
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(execute_stack_op): Add dwarf2_per_objfile parameter, pass it
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to dwarf2_expr_executor constructor. Don't set offset.
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(dwarf2_fetch_cfa_info): Update.
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(struct dwarf2_frame_cache) <text_offset>: Remove.
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<per_objfile>: New field.
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(dwarf2_frame_cache): Update.
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(dwarf2_frame_prev_register): Update.
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* dwarf2/loc.c (class dwarf_evaluate_loc_desc)
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<dwarf_evaluate_loc_desc>: Add constructor.
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(dwarf2_evaluate_loc_desc_full): Update.
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(dwarf2_locexpr_baton_eval): Update.
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(class symbol_needs_eval_context) <symbol_needs_eval_context>:
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Add constructor.
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(dwarf2_loc_desc_get_symbol_read_needs): Update.
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2020-05-27 Simon Marchi <simon.marchi@efficios.com>
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* dwarf2/read.h (struct dwarf2_per_cu_data) <addr_type,
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@ -27,6 +27,7 @@
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#include "dwarf2.h"
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#include "dwarf2/expr.h"
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#include "dwarf2/loc.h"
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#include "dwarf2/read.h"
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#include "gdbsupport/underlying.h"
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#include "gdbarch.h"
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@ -88,17 +89,17 @@ dwarf_expr_context::address_type () const
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/* Create a new context for the expression evaluator. */
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dwarf_expr_context::dwarf_expr_context ()
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dwarf_expr_context::dwarf_expr_context (dwarf2_per_objfile *per_objfile)
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: gdbarch (NULL),
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addr_size (0),
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ref_addr_size (0),
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offset (0),
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recursion_depth (0),
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max_recursion_depth (0x100),
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location (DWARF_VALUE_MEMORY),
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len (0),
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data (NULL),
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initialized (0)
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initialized (0),
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per_objfile (per_objfile)
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{
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}
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@ -631,7 +632,7 @@ dwarf_expr_context::execute_stack_op (const gdb_byte *op_ptr,
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index, not an address. We don't support things like
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branching between the address and the TLS op. */
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if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address)
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result += this->offset;
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result += this->per_objfile->objfile->text_section_offset ();
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result_val = value_from_ulongest (address_type, result);
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break;
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@ -639,7 +640,7 @@ dwarf_expr_context::execute_stack_op (const gdb_byte *op_ptr,
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case DW_OP_GNU_addr_index:
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op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
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result = this->get_addr_index (uoffset);
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result += this->offset;
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result += this->per_objfile->objfile->text_section_offset ();
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result_val = value_from_ulongest (address_type, result);
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break;
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case DW_OP_GNU_const_index:
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@ -25,6 +25,8 @@
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#include "leb128.h"
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#include "gdbtypes.h"
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struct dwarf2_per_objfile;
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/* The location of a value. */
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enum dwarf_value_location
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{
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@ -117,7 +119,7 @@ struct dwarf_stack_value
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its current state and its callbacks. */
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struct dwarf_expr_context
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{
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dwarf_expr_context ();
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dwarf_expr_context (dwarf2_per_objfile *per_objfile);
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virtual ~dwarf_expr_context () = default;
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void push_address (CORE_ADDR value, bool in_stack_memory);
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@ -139,10 +141,6 @@ struct dwarf_expr_context
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context and operations depending on DW_FORM_ref_addr are not allowed. */
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int ref_addr_size;
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/* Offset used to relocate DW_OP_addr, DW_OP_addrx, and
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DW_OP_GNU_addr_index arguments. */
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CORE_ADDR offset;
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/* The current depth of dwarf expression recursion, via DW_OP_call*,
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DW_OP_fbreg, DW_OP_push_object_address, etc., and the maximum
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depth we'll tolerate before raising an error. */
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@ -185,6 +183,9 @@ struct dwarf_expr_context
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two cases need to be handled separately.) */
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std::vector<dwarf_expr_piece> pieces;
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/* We evaluate the expression in the context of this objfile. */
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dwarf2_per_objfile *per_objfile;
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/* Return the value of register number REGNUM (a DWARF register number),
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read as an address. */
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virtual CORE_ADDR read_addr_from_reg (int regnum) = 0;
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@ -166,8 +166,8 @@ struct comp_unit
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auto_obstack obstack;
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};
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static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc,
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CORE_ADDR *out_offset);
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static struct dwarf2_fde *dwarf2_frame_find_fde
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(CORE_ADDR *pc, dwarf2_per_objfile **out_per_objfile);
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static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum,
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int eh_frame_p);
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@ -237,7 +237,11 @@ register %s (#%d) at %s"),
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class dwarf_expr_executor : public dwarf_expr_context
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{
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public:
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public:
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dwarf_expr_executor (dwarf2_per_objfile *per_objfile)
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: dwarf_expr_context (per_objfile)
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{}
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struct frame_info *this_frame;
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@ -311,19 +315,18 @@ class dwarf_expr_executor : public dwarf_expr_context
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static CORE_ADDR
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execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size,
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CORE_ADDR offset, struct frame_info *this_frame,
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CORE_ADDR initial, int initial_in_stack_memory)
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struct frame_info *this_frame, CORE_ADDR initial,
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int initial_in_stack_memory, dwarf2_per_objfile *per_objfile)
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{
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CORE_ADDR result;
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dwarf_expr_executor ctx;
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dwarf_expr_executor ctx (per_objfile);
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scoped_value_mark free_values;
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ctx.this_frame = this_frame;
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ctx.gdbarch = get_frame_arch (this_frame);
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ctx.addr_size = addr_size;
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ctx.ref_addr_size = -1;
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ctx.offset = offset;
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ctx.push_address (initial, initial_in_stack_memory);
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ctx.eval (exp, len);
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@ -883,14 +886,16 @@ dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc,
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const gdb_byte **cfa_end_out)
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{
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struct dwarf2_fde *fde;
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CORE_ADDR text_offset;
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dwarf2_per_objfile *per_objfile;
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CORE_ADDR pc1 = pc;
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/* Find the correct FDE. */
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fde = dwarf2_frame_find_fde (&pc1, &text_offset);
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fde = dwarf2_frame_find_fde (&pc1, &per_objfile);
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if (fde == NULL)
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error (_("Could not compute CFA; needed to translate this expression"));
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gdb_assert (per_objfile != nullptr);
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dwarf2_frame_state fs (pc1, fde->cie);
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/* Check for "quirks" - known bugs in producers. */
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@ -898,14 +903,15 @@ dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc,
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/* First decode all the insns in the CIE. */
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execute_cfa_program (fde, fde->cie->initial_instructions,
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fde->cie->end, gdbarch, pc, &fs, text_offset);
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fde->cie->end, gdbarch, pc, &fs,
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per_objfile->objfile->text_section_offset ());
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/* Save the initialized register set. */
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fs.initial = fs.regs;
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/* Then decode the insns in the FDE up to our target PC. */
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execute_cfa_program (fde, fde->instructions, fde->end, gdbarch, pc, &fs,
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text_offset);
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per_objfile->objfile->text_section_offset ());
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/* Calculate the CFA. */
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switch (fs.regs.cfa_how)
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@ -923,7 +929,7 @@ dwarf2_fetch_cfa_info (struct gdbarch *gdbarch, CORE_ADDR pc,
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}
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case CFA_EXP:
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*text_offset_out = text_offset;
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*text_offset_out = per_objfile->objfile->text_section_offset ();
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*cfa_start_out = fs.regs.cfa_exp;
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*cfa_end_out = fs.regs.cfa_exp + fs.regs.cfa_exp_len;
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return 0;
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@ -956,8 +962,8 @@ struct dwarf2_frame_cache
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/* Target address size in bytes. */
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int addr_size;
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/* The .text offset. */
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CORE_ADDR text_offset;
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/* The dwarf2_per_objfile from which this frame description came. */
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dwarf2_per_objfile *per_objfile;
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/* If not NULL then this frame is the bottom frame of a TAILCALL_FRAME
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sequence. If NULL then it is a normal case with no TAILCALL_FRAME
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@ -1003,8 +1009,9 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
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CORE_ADDR pc1 = get_frame_address_in_block (this_frame);
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/* Find the correct FDE. */
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fde = dwarf2_frame_find_fde (&pc1, &cache->text_offset);
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fde = dwarf2_frame_find_fde (&pc1, &cache->per_objfile);
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gdb_assert (fde != NULL);
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gdb_assert (cache->per_objfile != nullptr);
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/* Allocate and initialize the frame state. */
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struct dwarf2_frame_state fs (pc1, fde->cie);
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@ -1018,7 +1025,7 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
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execute_cfa_program (fde, fde->cie->initial_instructions,
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fde->cie->end, gdbarch,
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get_frame_address_in_block (this_frame), &fs,
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cache->text_offset);
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cache->per_objfile->objfile->text_section_offset ());
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/* Save the initialized register set. */
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fs.initial = fs.regs;
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@ -1034,8 +1041,9 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
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&& entry_pc < fde->initial_location + fde->address_range)
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{
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/* Decode the insns in the FDE up to the entry PC. */
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instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch,
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entry_pc, &fs, cache->text_offset);
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instr = execute_cfa_program
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(fde, fde->instructions, fde->end, gdbarch, entry_pc, &fs,
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cache->per_objfile->objfile->text_section_offset ());
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if (fs.regs.cfa_how == CFA_REG_OFFSET
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&& (dwarf_reg_to_regnum (gdbarch, fs.regs.cfa_reg)
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@ -1051,7 +1059,7 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
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/* Then decode the insns in the FDE up to our target PC. */
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execute_cfa_program (fde, instr, fde->end, gdbarch,
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get_frame_address_in_block (this_frame), &fs,
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cache->text_offset);
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cache->per_objfile->objfile->text_section_offset ());
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try
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{
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@ -1069,8 +1077,8 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
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case CFA_EXP:
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cache->cfa =
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execute_stack_op (fs.regs.cfa_exp, fs.regs.cfa_exp_len,
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cache->addr_size, cache->text_offset,
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this_frame, 0, 0);
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cache->addr_size, this_frame, 0, 0,
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cache->per_objfile);
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break;
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default:
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@ -1270,8 +1278,9 @@ dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache,
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case DWARF2_FRAME_REG_SAVED_EXP:
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addr = execute_stack_op (cache->reg[regnum].loc.exp.start,
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cache->reg[regnum].loc.exp.len,
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cache->addr_size, cache->text_offset,
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this_frame, cache->cfa, 1);
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cache->addr_size,
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this_frame, cache->cfa, 1,
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cache->per_objfile);
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return frame_unwind_got_memory (this_frame, regnum, addr);
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case DWARF2_FRAME_REG_SAVED_VAL_OFFSET:
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@ -1281,8 +1290,9 @@ dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache,
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case DWARF2_FRAME_REG_SAVED_VAL_EXP:
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addr = execute_stack_op (cache->reg[regnum].loc.exp.start,
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cache->reg[regnum].loc.exp.len,
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cache->addr_size, cache->text_offset,
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this_frame, cache->cfa, 1);
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cache->addr_size,
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this_frame, cache->cfa, 1,
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cache->per_objfile);
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return frame_unwind_got_constant (this_frame, regnum, addr);
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case DWARF2_FRAME_REG_UNSPECIFIED:
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@ -1650,7 +1660,7 @@ set_comp_unit (struct objfile *objfile, struct comp_unit *unit)
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initial location associated with it into *PC. */
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static struct dwarf2_fde *
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dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset)
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dwarf2_frame_find_fde (CORE_ADDR *pc, dwarf2_per_objfile **out_per_objfile)
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{
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for (objfile *objfile : current_program_space->objfiles ())
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{
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@ -1682,8 +1692,9 @@ dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset)
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if (it != fde_table->end ())
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{
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*pc = (*it)->initial_location + offset;
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if (out_offset)
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*out_offset = offset;
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if (out_per_objfile != nullptr)
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*out_per_objfile = get_dwarf2_per_objfile (objfile);
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return *it;
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}
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}
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@ -617,7 +617,10 @@ sect_variable_value (struct dwarf_expr_context *ctx, sect_offset sect_off,
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class dwarf_evaluate_loc_desc : public dwarf_expr_context
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{
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public:
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public:
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dwarf_evaluate_loc_desc (dwarf2_per_objfile *per_objfile)
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: dwarf_expr_context (per_objfile)
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{}
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struct frame_info *frame;
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struct dwarf2_per_cu_data *per_cu;
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@ -733,8 +736,6 @@ class dwarf_evaluate_loc_desc : public dwarf_expr_context
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this->gdbarch = per_cu->objfile ()->arch ();
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scoped_restore save_addr_size = make_scoped_restore (&this->addr_size);
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this->addr_size = per_cu->addr_size ();
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scoped_restore save_offset = make_scoped_restore (&this->offset);
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this->offset = per_cu->text_offset ();
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this->eval (data_src, size);
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}
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@ -2191,7 +2192,8 @@ dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame,
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if (size == 0)
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return allocate_optimized_out_value (subobj_type);
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dwarf_evaluate_loc_desc ctx;
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dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
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dwarf_evaluate_loc_desc ctx (per_objfile);
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ctx.frame = frame;
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ctx.per_cu = per_cu;
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ctx.obj_address = 0;
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@ -2201,7 +2203,6 @@ dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame,
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ctx.gdbarch = objfile->arch ();
|
||||
ctx.addr_size = per_cu->addr_size ();
|
||||
ctx.ref_addr_size = per_cu->ref_addr_size ();
|
||||
ctx.offset = per_cu->text_offset ();
|
||||
|
||||
try
|
||||
{
|
||||
@ -2398,6 +2399,10 @@ dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
|
||||
|
||||
struct evaluate_for_locexpr_baton : public dwarf_evaluate_loc_desc
|
||||
{
|
||||
evaluate_for_locexpr_baton (dwarf2_per_objfile *per_objfile)
|
||||
: dwarf_evaluate_loc_desc (per_objfile)
|
||||
{}
|
||||
|
||||
/* The data that was passed in. */
|
||||
gdb::array_view<const gdb_byte> data_view;
|
||||
|
||||
@ -2443,12 +2448,11 @@ dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton,
|
||||
CORE_ADDR *valp,
|
||||
bool push_initial_value)
|
||||
{
|
||||
struct objfile *objfile;
|
||||
|
||||
if (dlbaton == NULL || dlbaton->size == 0)
|
||||
return 0;
|
||||
|
||||
evaluate_for_locexpr_baton ctx;
|
||||
dwarf2_per_objfile *per_objfile = dlbaton->per_objfile;
|
||||
evaluate_for_locexpr_baton ctx (per_objfile);
|
||||
|
||||
ctx.frame = frame;
|
||||
ctx.per_cu = dlbaton->per_cu;
|
||||
@ -2460,12 +2464,9 @@ dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton,
|
||||
ctx.data_view = addr_stack->valaddr;
|
||||
}
|
||||
|
||||
objfile = dlbaton->per_objfile->objfile;
|
||||
|
||||
ctx.gdbarch = objfile->arch ();
|
||||
ctx.gdbarch = per_objfile->objfile->arch ();
|
||||
ctx.addr_size = dlbaton->per_cu->addr_size ();
|
||||
ctx.ref_addr_size = dlbaton->per_cu->ref_addr_size ();
|
||||
ctx.offset = dlbaton->per_cu->text_offset ();
|
||||
|
||||
if (push_initial_value)
|
||||
ctx.push_address (ctx.obj_address, false);
|
||||
@ -2675,7 +2676,10 @@ dwarf2_compile_property_to_c (string_file *stream,
|
||||
|
||||
class symbol_needs_eval_context : public dwarf_expr_context
|
||||
{
|
||||
public:
|
||||
public:
|
||||
symbol_needs_eval_context (dwarf2_per_objfile *per_objfile)
|
||||
: dwarf_expr_context (per_objfile)
|
||||
{}
|
||||
|
||||
enum symbol_needs_kind needs;
|
||||
struct dwarf2_per_cu_data *per_cu;
|
||||
@ -2792,14 +2796,13 @@ dwarf2_loc_desc_get_symbol_read_needs (const gdb_byte *data, size_t size,
|
||||
|
||||
scoped_value_mark free_values;
|
||||
|
||||
symbol_needs_eval_context ctx;
|
||||
symbol_needs_eval_context ctx (get_dwarf2_per_objfile (objfile));
|
||||
|
||||
ctx.needs = SYMBOL_NEEDS_NONE;
|
||||
ctx.per_cu = per_cu;
|
||||
ctx.gdbarch = objfile->arch ();
|
||||
ctx.addr_size = per_cu->addr_size ();
|
||||
ctx.ref_addr_size = per_cu->ref_addr_size ();
|
||||
ctx.offset = per_cu->text_offset ();
|
||||
|
||||
ctx.eval (data, size);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user