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sp_cond_type_t *val;
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The scope of a label in Stored Procedures,
93
for name resolution of labels in a parsing context.
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The labels declared in a parent context are in scope.
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The labels declared in a parent context are not in scope.
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The parse-time context, used to keep track on declared variables/parameters,
108
The parse-time context, used to keep track of declared variables/parameters,
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109
conditions, handlers, cursors and labels, during parsing.
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sp_contexts are organized as a tree, with one object for each begin-end
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block, plus a root-context for the parameters.
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block, one object for each exception handler,
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plus a root-context for the parameters.
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113
This is used during parsing for looking up defined names (e.g. declared
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114
variables and visible labels), for error checking, and to calculate offsets
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115
to be used at runtime. (During execution variable values, active handlers
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and cursors, etc, are referred to by an index in a stack.)
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Parsing contexts for exception handlers limit the visibility of labels.
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The pcontext tree is also kept during execution and is used for error
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checking (e.g. correct number of parameters), and in the future, used by
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123
class sp_pcontext : public Sql_alloc
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sp_pcontext(const sp_pcontext &); /* Prevent use of these */
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void operator=(sp_pcontext &);
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sp_pcontext(sp_pcontext *prev);
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Builds a parsing context root node.
138
Create and push a new context in the tree.
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@param label_scope label scope for the new parsing context
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@return the node created
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push_context(label_scope_type label_scope);
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// Returns the previous context, not the one we pop
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Pop a node from the parsing context tree.
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@return the parent node
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Constructor for a tree node.
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@param prev the parent parsing context
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@param label_scope label_scope for this parsing context
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sp_pcontext(sp_pcontext *prev, label_scope_type label_scope);
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m_max_var_index -- number of variables (including all types of arguments)
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in this context including all children contexts.
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List<sp_pcontext> m_children; // Children contexts, used for destruction
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Scope of labels for this parsing context.
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label_scope_type m_label_scope;
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sp_pcontext(const sp_pcontext &); /* Prevent use of these */
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void operator=(sp_pcontext &);
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}; // class sp_pcontext : public Sql_alloc
added
removed
sql/sp_pcontext.h
