12be40ae6b
[Feature #20205] As a path toward enabling frozen string literals by default in the future, this commit introduce "chilled strings". From a user perspective chilled strings pretend to be frozen, but on the first attempt to mutate them, they lose their frozen status and emit a warning rather than to raise a `FrozenError`. Implementation wise, `rb_compile_option_struct.frozen_string_literal` is no longer a boolean but a tri-state of `enabled/disabled/unset`. When code is compiled with frozen string literals neither explictly enabled or disabled, string literals are compiled with a new `putchilledstring` instruction. This instruction is identical to `putstring` except it marks the String with the `STR_CHILLED (FL_USER3)` and `FL_FREEZE` flags. Chilled strings have the `FL_FREEZE` flag as to minimize the need to check for chilled strings across the codebase, and to improve compatibility with C extensions. Notes: - `String#freeze`: clears the chilled flag. - `String#-@`: acts as if the string was mutable. - `String#+@`: acts as if the string was mutable. - `String#clone`: copies the chilled flag. Co-authored-by: Jean Boussier <byroot@ruby-lang.org>
65 lines
2.6 KiB
C
65 lines
2.6 KiB
C
#include "prism/prism.h"
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#include "ruby/encoding.h"
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/**
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* the getlocal and setlocal instructions require two parameters. level is how
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* many hops up the iseq stack one needs to go before finding the correct local
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* table. The index is the index in that table where our variable is.
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*
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* Because these are always calculated and used together, we'll bind them
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* together as a tuple.
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*/
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typedef struct pm_local_index_struct {
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int index, level;
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} pm_local_index_t;
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// ScopeNodes are helper nodes, and will never be part of the AST. We manually
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// declare them here to avoid generating them.
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typedef struct pm_scope_node {
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pm_node_t base;
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struct pm_scope_node *previous;
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pm_node_t *ast_node;
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pm_node_t *parameters;
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pm_node_t *body;
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pm_constant_id_list_t locals;
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const pm_parser_t *parser;
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rb_encoding *encoding;
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// The size of the local table
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// on the iseq which includes
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// locals and hidden variables
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int local_table_for_iseq_size;
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ID *constants;
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st_table *index_lookup_table;
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} pm_scope_node_t;
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void pm_scope_node_init(const pm_node_t *node, pm_scope_node_t *scope, pm_scope_node_t *previous);
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void pm_scope_node_destroy(pm_scope_node_t *scope_node);
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bool *rb_ruby_prism_ptr(void);
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typedef struct {
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pm_parser_t parser;
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pm_options_t options;
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pm_string_t input;
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pm_scope_node_t node;
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bool parsed;
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} pm_parse_result_t;
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void pm_options_frozen_string_literal_init(pm_parse_result_t *result, int frozen_string_literal);
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VALUE pm_load_file(pm_parse_result_t *result, VALUE filepath);
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VALUE pm_parse_file(pm_parse_result_t *result, VALUE filepath);
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VALUE pm_load_parse_file(pm_parse_result_t *result, VALUE filepath);
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VALUE pm_parse_string(pm_parse_result_t *result, VALUE source, VALUE filepath);
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VALUE pm_parse_stdin(pm_parse_result_t *result);
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void pm_parse_result_free(pm_parse_result_t *result);
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rb_iseq_t *pm_iseq_new(pm_scope_node_t *node, VALUE name, VALUE path, VALUE realpath, const rb_iseq_t *parent, enum rb_iseq_type);
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rb_iseq_t *pm_iseq_new_top(pm_scope_node_t *node, VALUE name, VALUE path, VALUE realpath, const rb_iseq_t *parent);
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rb_iseq_t *pm_iseq_new_main(pm_scope_node_t *node, VALUE path, VALUE realpath, const rb_iseq_t *parent, int opt);
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rb_iseq_t *pm_iseq_new_eval(pm_scope_node_t *node, VALUE name, VALUE path, VALUE realpath, int first_lineno, const rb_iseq_t *parent, int isolated_depth);
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rb_iseq_t *pm_iseq_new_with_opt(pm_scope_node_t *node, VALUE name, VALUE path, VALUE realpath, int first_lineno, const rb_iseq_t *parent, int isolated_depth, enum rb_iseq_type, const rb_compile_option_t*);
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VALUE pm_iseq_compile_node(rb_iseq_t *iseq, pm_scope_node_t *node);
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