From 4933522da0d59823d2bfef3706e2252203365e9c Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Mon, 8 Mar 2021 07:27:57 -0700 Subject: [PATCH] Add completion for operations This patch adds the necessary support for field name completion for expressions using class operation. This patch takes an approach similar to what is done today. It might be good, in the future, to change completion to be a method on the base class, to enable context-sensitive completion in more areas. gdb/ChangeLog 2021-03-08 Tom Tromey * parser-defs.h (struct expr_completion_state) : New member. (struct parser_state) : New method. * parse.c (parser_state::mark_struct_expression): Update assert. (parser_state::mark_struct_expression): New method. (parser_state::mark_completion_tag): Update assert. (parse_expression_for_completion): Handle expout_last_op. --- gdb/ChangeLog | 10 ++++++++++ gdb/parse.c | 26 ++++++++++++++++++++++++-- gdb/parser-defs.h | 11 +++++++++++ 3 files changed, 45 insertions(+), 2 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 5fd0967d3d5..3436e4e83fc 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,13 @@ +2021-03-08 Tom Tromey + + * parser-defs.h (struct expr_completion_state) : + New member. + (struct parser_state) : New method. + * parse.c (parser_state::mark_struct_expression): Update assert. + (parser_state::mark_struct_expression): New method. + (parser_state::mark_completion_tag): Update assert. + (parse_expression_for_completion): Handle expout_last_op. + 2021-03-08 Tom Tromey * ada-exp.h (class ada_var_value_operation) : Remove; diff --git a/gdb/parse.c b/gdb/parse.c index 68386f17bc5..79b1ca16121 100644 --- a/gdb/parse.c +++ b/gdb/parse.c @@ -507,10 +507,23 @@ parser_state::mark_struct_expression () { gdb_assert (parse_completion && (m_completion_state.expout_tag_completion_type - == TYPE_CODE_UNDEF)); + == TYPE_CODE_UNDEF) + && m_completion_state.expout_last_op == nullptr); m_completion_state.expout_last_struct = expout_ptr; } +/* See parser-defs.h. */ + +void +parser_state::mark_struct_expression (expr::structop_base_operation *op) +{ + gdb_assert (parse_completion + && (m_completion_state.expout_tag_completion_type + == TYPE_CODE_UNDEF) + && m_completion_state.expout_last_struct == -1); + m_completion_state.expout_last_op = op; +} + /* Indicate that the current parser invocation is completing a tag. TAG is the type code of the tag, and PTR and LENGTH represent the start of the tag name. */ @@ -523,7 +536,8 @@ parser_state::mark_completion_tag (enum type_code tag, const char *ptr, && (m_completion_state.expout_tag_completion_type == TYPE_CODE_UNDEF) && m_completion_state.expout_completion_name == NULL - && m_completion_state.expout_last_struct == -1); + && m_completion_state.expout_last_struct == -1 + && m_completion_state.expout_last_op == nullptr); gdb_assert (tag == TYPE_CODE_UNION || tag == TYPE_CODE_STRUCT || tag == TYPE_CODE_ENUM); @@ -1262,6 +1276,14 @@ parse_expression_for_completion (const char *string, return NULL; } + if (cstate.expout_last_op != nullptr) + { + expr::structop_base_operation *op = cstate.expout_last_op; + const std::string &fld = op->get_string (); + *name = make_unique_xstrdup (fld.c_str ()); + return value_type (op->evaluate_lhs (exp.get ())); + } + if (cstate.expout_last_struct == -1) return NULL; diff --git a/gdb/parser-defs.h b/gdb/parser-defs.h index a9ae198fab2..9f70ff9dca7 100644 --- a/gdb/parser-defs.h +++ b/gdb/parser-defs.h @@ -25,6 +25,7 @@ #include "expression.h" #include "symtab.h" +#include "expop.h" struct block; struct language_defn; @@ -93,6 +94,11 @@ struct expr_completion_state field name. It is -1 if no dereference operation was found. */ int expout_last_struct = -1; + /* The last struct expression directly before a '.' or '->'. This + is set when parsing and is only used when completing a field + name. It is nullptr if no dereference operation was found. */ + expr::structop_base_operation *expout_last_op = nullptr; + /* If we are completing a tagged type name, this will be nonzero. */ enum type_code expout_tag_completion_type = TYPE_CODE_UNDEF; @@ -156,6 +162,11 @@ struct parser_state : public expr_builder void mark_struct_expression (); + /* Mark the given operation as the starting location of a structure + expression. This is used when completing on field names. */ + + void mark_struct_expression (expr::structop_base_operation *op); + /* Indicate that the current parser invocation is completing a tag. TAG is the type code of the tag, and PTR and LENGTH represent the start of the tag name. */ -- 2.30.2