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/**
* @file schema_compile.h
* @author Radek Krejci <rkrejci@cesnet.cz>
* @author Michal Vasko <mvasko@cesnet.cz>
* @brief Header for schema compilation.
*
* Copyright (c) 2015 - 2021 CESNET, z.s.p.o.
*
* This source code is licensed under BSD 3-Clause License (the "License").
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*/
#ifndef LY_SCHEMA_COMPILE_H_
#define LY_SCHEMA_COMPILE_H_
#include <stddef.h>
#include <stdint.h>
#include "dict.h"
#include "log.h"
#include "set.h"
#include "tree.h"
#include "tree_edit.h"
#include "tree_schema.h"
struct lyxp_expr;
/**
* @brief YANG schema compilation context.
*/
struct lysc_ctx {
struct ly_ctx *ctx; /**< libyang context */
struct lys_module *cur_mod; /**< module currently being compiled,
- identifier/path - used as the current module for unprefixed nodes
- augment - module where the augment is defined
- deviation - module where the deviation is defined
- uses - module where the uses is defined */
struct lysp_module *pmod; /**< parsed module being processed,
- identifier/path - used for searching imports to resolve prefixed nodes
- augment - module where the augment is defined
- deviation - module where the deviation is defined
- uses - module where the grouping is defined */
struct lysc_ext_instance *ext; /**< extension instance being processed and serving as a source for its substatements
instead of the module itself */
struct ly_set groupings; /**< stack for groupings circular check */
struct ly_set tpdf_chain; /**< stack for typedefs circular check */
struct ly_set augs; /**< set of compiled non-applied top-level augments (stored ::lysc_augment *) */
struct ly_set devs; /**< set of compiled non-applied deviations (stored ::lysc_deviation *) */
struct ly_set uses_augs; /**< set of compiled non-applied uses augments (stored ::lysc_augment *) */
struct ly_set uses_rfns; /**< set of compiled non-applied uses refines (stored ::lysc_refine *) */
struct lys_depset_unres *unres; /**< dependency set unres sets */
uint32_t path_len; /**< number of path bytes used */
uint32_t compile_opts; /**< various @ref scflags. */
#define LYSC_CTX_BUFSIZE 4078
char path[LYSC_CTX_BUFSIZE];/**< Path identifying the schema node currently being processed */
};
/**
* @brief Structure for unresolved items that may depend on any implemented module data in the dependency set
* so their resolution can only be performed after the whole dep set compilation is done.
*/
struct lys_depset_unres {
struct ly_set xpath; /**< when/must to check */
struct ly_set leafrefs; /**< to validate target of leafrefs */
struct ly_set dflts; /**< set of incomplete default values */
struct ly_set disabled; /**< set of compiled nodes whose if-feature(s) was not satisfied (stored ::lysc_node *) */
struct ly_set disabled_leafrefs; /**< subset of the lys_depset_unres.disabled to validate target of disabled leafrefs */
};
/**
* @brief Unres structure global for compilation.
*/
struct lys_glob_unres {
struct ly_set dep_sets; /**< set of dependency sets of modules, see ::lys_compile_depset_all() */
struct ly_set implementing; /**< set of YANG schemas being atomically implemented (compiled); the first added
module is always the explicitly implemented module, the other ones are dependencies */
struct ly_set creating; /**< set of YANG schemas being atomically created (parsed); it is a subset of implemented
and all these modules are freed if any error occurs */
struct lys_depset_unres ds_unres; /**< unres specific for the current dependency set */
};
/**
* @brief Structure for remembering default values of leaves and leaf-lists. They are resolved at schema compilation
* end when the whole schema tree is available.
*/
struct lysc_unres_dflt {
union {
struct lysc_node_leaf *leaf;
struct lysc_node_leaflist *llist;
};
struct lysp_qname *dflt;
struct lysp_qname *dflts; /**< this is a sized array */
};
/**
* @brief Duplicate string into dictionary
* @param[in] CTX libyang context of the dictionary.
* @param[in] ORIG String to duplicate.
* @param[out] DUP Where to store the result.
* @param[out] RET Where to store the return code.
*/
#define DUP_STRING(CTX, ORIG, DUP, RET) if (ORIG) {RET = lydict_insert(CTX, ORIG, 0, &DUP);}
#define DUP_STRING_RET(CTX, ORIG, DUP) if (ORIG) {LY_ERR __ret = lydict_insert(CTX, ORIG, 0, &DUP); LY_CHECK_RET(__ret);}
#define DUP_STRING_GOTO(CTX, ORIG, DUP, RET, GOTO) if (ORIG) {LY_CHECK_GOTO(RET = lydict_insert(CTX, ORIG, 0, &DUP), GOTO);}
#define DUP_ARRAY(CTX, ORIG_ARRAY, NEW_ARRAY, DUP_FUNC) \
if (ORIG_ARRAY) { \
LY_ARRAY_COUNT_TYPE __u; \
LY_ARRAY_CREATE_RET(CTX, NEW_ARRAY, LY_ARRAY_COUNT(ORIG_ARRAY), LY_EMEM); \
LY_ARRAY_FOR(ORIG_ARRAY, __u) { \
LY_ARRAY_INCREMENT(NEW_ARRAY); \
LY_CHECK_RET(DUP_FUNC(CTX, &(NEW_ARRAY)[__u], &(ORIG_ARRAY)[__u])); \
} \
}
#define COMPILE_OP_ARRAY_GOTO(CTX, ARRAY_P, ARRAY_C, PARENT, FUNC, USES_STATUS, RET, GOTO) \
if (ARRAY_P) { \
LY_ARRAY_COUNT_TYPE __u = (ARRAY_C) ? LY_ARRAY_COUNT(ARRAY_C) : 0; \
LY_ARRAY_CREATE_GOTO((CTX)->ctx, ARRAY_C, __u + LY_ARRAY_COUNT(ARRAY_P), RET, GOTO); \
LY_ARRAY_FOR(ARRAY_P, __u) { \
LY_ARRAY_INCREMENT(ARRAY_C); \
RET = FUNC(CTX, &(ARRAY_P)[__u], PARENT, &(ARRAY_C)[LY_ARRAY_COUNT(ARRAY_C) - 1], USES_STATUS); \
if (RET == LY_EDENIED) { \
LY_ARRAY_DECREMENT(ARRAY_C); \
RET = LY_SUCCESS; \
} else if (RET) { \
goto GOTO; \
} \
} \
}
#define COMPILE_ARRAY_GOTO(CTX, ARRAY_P, ARRAY_C, FUNC, RET, GOTO) \
if (ARRAY_P) { \
LY_ARRAY_COUNT_TYPE __u = (ARRAY_C) ? LY_ARRAY_COUNT(ARRAY_C) : 0; \
LY_ARRAY_CREATE_GOTO((CTX)->ctx, ARRAY_C, __u + LY_ARRAY_COUNT(ARRAY_P), RET, GOTO); \
LY_ARRAY_FOR(ARRAY_P, __u) { \
LY_ARRAY_INCREMENT(ARRAY_C); \
RET = FUNC(CTX, &(ARRAY_P)[__u], &(ARRAY_C)[LY_ARRAY_COUNT(ARRAY_C) - 1]); \
LY_CHECK_GOTO(RET, GOTO); \
} \
}
#define COMPILE_EXTS_GOTO(CTX, EXTS_P, EXT_C, PARENT, RET, GOTO) \
if (EXTS_P) { \
LY_ARRAY_COUNT_TYPE __u = (EXT_C) ? LY_ARRAY_COUNT(EXT_C) : 0; \
LY_ARRAY_CREATE_GOTO((CTX)->ctx, EXT_C, __u + LY_ARRAY_COUNT(EXTS_P), RET, GOTO); \
LY_ARRAY_FOR(EXTS_P, __u) { \
LY_ARRAY_INCREMENT(EXT_C); \
RET = lys_compile_ext(CTX, &(EXTS_P)[__u], &(EXT_C)[LY_ARRAY_COUNT(EXT_C) - 1], PARENT, NULL); \
if (RET == LY_ENOT) { \
LY_ARRAY_DECREMENT(EXT_C); \
RET = LY_SUCCESS; \
} else if (RET) { \
goto GOTO; \
} \
} \
}
/**
* @brief Fill in the prepared compiled extension instance structure according to the parsed extension instance.
*
* @param[in] ctx Compilation context.
* @param[in] ext_p Parsed extension instance.
* @param[in,out] ext Prepared compiled extension instance.
* @param[in] parent Extension instance parent.
* @param[in] ext_mod Optional module with the extension instance extension definition, set only for internal annotations.
* @return LY_SUCCESS on success.
* @return LY_ENOT if the extension is disabled and should be ignored.
* @return LY_ERR on error.
*/
LY_ERR lys_compile_ext(struct lysc_ctx *ctx, struct lysp_ext_instance *ext_p, struct lysc_ext_instance *ext, void *parent,
const struct lys_module *ext_mod);
/**
* @brief Find and process the referenced base identities from another identity or identityref
*
* For bases in identity set backlinks to them from the base identities. For identityref, store
* the array of pointers to the base identities. So one of the ident or bases parameter must be set
* to distinguish these two use cases.
*
* @param[in] ctx Compile context, not only for logging but also to get the current module to resolve prefixes.
* @param[in] base_pmod Module where to resolve @p bases_p prefixes.
* @param[in] bases_p Array of names (including prefix if necessary) of base identities.
* @param[in] ident Referencing identity to work with, NULL for identityref.
* @param[in] bases Array of bases of identityref to fill in.
* @return LY_ERR value.
*/
LY_ERR lys_compile_identity_bases(struct lysc_ctx *ctx, const struct lysp_module *base_pmod, const char **bases_p,
struct lysc_ident *ident, struct lysc_ident ***bases);
/**
* @brief Perform a complet compilation of identites in a module and all its submodules.
*
* @param[in] mod Module to process.
* @return LY_ERR value.
*/
LY_ERR lys_compile_identities(struct lys_module *mod);
/**
* @brief Compile schema into a validated schema linking all the references. Must have been implemented before.
*
* @param[in] mod Pointer to the schema structure holding pointers to both schema structure types. The ::lys_module#parsed
* member is used as input and ::lys_module#compiled is used to hold the result of the compilation.
* @param[in,out] unres Dep set unres structure to add to.
* @return LY_SUCCESS on success.
* @return LY_ERR on error.
*/
LY_ERR lys_compile(struct lys_module *mod, struct lys_depset_unres *unres);
/**
* @brief Check statement's status for invalid combination.
*
* The modX parameters are used just to determine if both flags are in the same module,
* so any of the schema module structure can be used, but both modules must be provided
* in the same type.
*
* @param[in] ctx Compile context for logging.
* @param[in] flags1 Flags of the referencing node.
* @param[in] mod1 Module of the referencing node,
* @param[in] name1 Schema node name of the referencing node.
* @param[in] flags2 Flags of the referenced node.
* @param[in] mod2 Module of the referenced node,
* @param[in] name2 Schema node name of the referenced node.
* @return LY_ERR value
*/
LY_ERR lysc_check_status(struct lysc_ctx *ctx, uint16_t flags1, void *mod1, const char *name1, uint16_t flags2,
void *mod2, const char *name2);
/**
* @brief Check parsed expression for any prefixes of unimplemented modules.
*
* @param[in] ctx libyang context.
* @param[in] expr Parsed expression.
* @param[in] format Prefix format.
* @param[in] prefix_data Format-specific data (see ::ly_resolve_prefix()).
* @param[in] implement Whether all the non-implemented modules should are implemented or the first
* non-implemented module, if any, returned in @p mod_p.
* @param[in,out] unres Global unres structure of newly implemented modules.
* @param[out] mod_p Module that is not implemented.
* @return LY_SUCCESS on success.
* @return LY_ERECOMPILE if @p implement is set.
* @return LY_ERR on error.
*/
LY_ERR lys_compile_expr_implement(const struct ly_ctx *ctx, const struct lyxp_expr *expr, LY_VALUE_FORMAT format,
void *prefix_data, ly_bool implement, struct lys_glob_unres *unres, const struct lys_module **mod_p);
/**
* @brief Compile all flagged modules in a dependency set, recursively if recompilation is needed.
*
* Steps taken when adding a new module (::ly_ctx_load_module(), ::lys_parse()):
*
* 1) parse module and add it into context with all imports and includes also parsed and in context
* (::lys_parse_load(), ::lys_parse_in(), lys_parse_localfile() - static)
* 2) implement it (perform one-time compilation tasks - compile identities and add reference to augment/deviation
* target modules, implement those as well, ::_lys_set_implemented())
* 3) create dep set of the module (::lys_unres_dep_sets_create())
* 4) (re)compile all the modules in the dep set and collect unres (::lys_compile_dep_set_r())
* 5) resolve unres (lys_compile_unres_depset() - static), new modules may be implemented like in 2) and if
* require recompilation, free all compiled modules and do 4)
* 6) all modules that needed to be (re)compiled are now, with all their dependencies
*
* What can cause new modules to be implemented when resolving unres in 5):
* - leafref
* - when, must
* - identityref, instance-identifier default value
* - new implemented module augments, deviations
*
* @param[in] ctx libyang context.
* @param[in,out] unres Global unres to use.
* @return LY_ERR value.
*/
LY_ERR lys_compile_depset_all(struct ly_ctx *ctx, struct lys_glob_unres *unres);
/**
* @brief Implement a single module. Does not actually compile, only marks to_compile!
*
* @param[in] mod Module to implement.
* @param[in] features Features to set, see ::lys_set_features().
* @param[in,out] unres Global unres to use.
* @return LY_ERR value.
*/
LY_ERR lys_implement(struct lys_module *mod, const char **features, struct lys_glob_unres *unres);
#endif /* LY_SCHEMA_COMPILE_H_ */