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A notification sound is now played when a long running debug step is finished. All commands now support environment variables. Previously you had to explicitly mark the select statement. The "Automatically Beautify" preference can now be enabled for all applicable window types. Previously this would only apply to the Program Window. Diagram Window Enhancements When adding a table to a diagram, you now have the option to automatically add related tables.

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An "Add related tables" option has been added to the table popup menu. Object Browser Enhancements A "Test" function has been added to the popup menu for database links. Object Browser Filter "where clause" and "order by clause" are now validated when pressing the "OK" button. Right-clicking on a synonym and selecting "Query data" or "Edit data" will now use the synonym name in the generated query instead of the resolved table or view name.

You can now use a backslash as escape character for the filter text. DBMS Output Enhancements The file name syntax now has additional variables for the date, for the Oracle username, Oracle database, as well as all environment variables.

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A preview for the complete file path has been added. A new "Include header in file" option has been added. When enabled an identification header will be inserted every time new output is written to the file. A variable dropdown button has been added to quickly insert a variable into the file specification:.

Connection Definition Enhancements You can directly define a color indicator for a connection definition. The indicator color can be displayed on the main toolbar, as window background and in other places as defined with the "Connection Matches" preference. You will get a warning message when making a duplicate connection definition. Connection popup menu item "Add to Folder" now allows you to immediately select a folder. A "Read Only" popup menu has been added to view or change the read only status of the window and file. The file open dialog now has a connection selector to open a file for a specific connection.

The compare functions now use an extension. If the "Allow multiple connections" preference is disabled off, the the object owner is suppressed in the window title when connected as the object owner. The "File saved" status line message is cleared after 10 seconds to restore the previous message.

The status line message now includes the timestamp when execution has finished. Recovery Enhancements The Crash Recovery form now provides an option to restore connections. This algorithm is very efficient and is able to positively identify all legal statements without requiring keywords to be reserved.

  • Software Engineers Handbook/Language Dictionary/PLI.
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Two modules, the context processor and the declaration processor, process declarative information gathered by the parse. The context processor scans the data base containing contextually derived attributes produced during the parse by the context recorder. It either augments the partial symbol table created from declare statements or creates new declarations having the same format as those derived from declare statements. This activity creates contextual and implicit declarations.

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The declaration processor develops sufficient information about the variables of the program so that they may be allocated storage, initialized and accessed by the program's operators. It is organized to perform three major functions: the preparation of accessing code, the computation of each variable's storage requirements, and the creation of initialization code. The declaration processor is relatively machine independent. All machine dependent characteristics, such as the number of bits per word and the alignment requirements of data types, are contained in a table.

All computations or statements produced by the declaration processor have the same internal representation as source language expressions or statements. Later phases of the compiler do not distinguish between them. A based declaration of the form. Multiple instances of data having the characteristics of A can be referenced through the use of unique pointers, i. The declaration processor implements a number of language features by transforming them into suitable based declarations.

Automatic data whose size is variable is transformed into a based declaration.

For example the declaration:. Either or both offsets may be zero. The term "word" is understood to refer to the addressable unit of a computer's storage. The address of A consists of a pointer to the declaring block's automatic storage, a word offset within that automatic storage and a zero bit offset.

One of the simplest PL/I programs is:

The word offset may include the distance from the origin of the item's storage class, as was the case with the first example, or it may be only the distance from the level-one containing structure, as it was in the last example. The term "level-one" refers to all variables which are not contained within structures. The declaration processor constructs offset expressions which represent the distance between an element of a structure and the data origin of its level-one containing structure.

If an offset expression contains only constant terms, it is evaluated by the declaration processor and results in a constant addressing offset. If the offset expression contains variable terms, the expression results in the generation of accessing instructions in the object program. The discussion which follows describes the efficient creation of these offset expressions. The declaration processor suppresses the creation of unnecessary conversion functions c k and boundary functions b k by keeping track of the current units and boundary as it builds the expression.

As a result the offset expressions of the previous example do not contain conversion functions and boundary functions for A and B.

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During the construction of the offset expression, the declaration processor separates the constant and variable terms so that the addition of constant terms is done by the compiler rather than by accessing code in the object program. The following example demonstrates the improvement gained by this technique.

The word offset and the bit offset are developed separately. Within each offset, the constant and variable parts are separated.

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These separations result in the minimization of additions and unit conversions. If the declaration contains only constant sizes, the resulting offsets are constant. If the declaration contains expressions, then the offsets are expressions containing the minimum number of terms and conversion factors. The development of size and offset expressions at compile time enables the object program to access data without the use of data descriptors or "dope vectors. Unless these descriptors are implemented by hardware, their use results in rather inefficient object code.

This code is generally more efficient than code which uses descriptors. In general, the offset expressions constructed by the declaration processor remain unchanged until code generation. Each subscripted reference or sub-string reference is a reference to a unique sub-datum within the declared datum and, therefore, requires a unique offset. The semantic translator constructs these unique offsets using the subscripts from the reference and the offset prepared by the declaration processor.

The declaration processor does not allocate storage for most classes of data, but it does determine the amount of storage needed by each variable. Variables are allocated within some segment of storage by the code generator. Storage allocation is delayed because, during semantic translation and optimization, additional declarations of constants and compiler created variables are made.

The declaration processor creates statements in the prologue of the declaring block which will initialize automatic data. It generates DO statements, IF statements and assignment statements to accomplish the required initialization. The expansion of the initial attribute for based and controlled data is identical to that for automatic data except that the required statements are inserted into the program at the point of allocation rather than in the prologue. Since array bounds and string sizes of static data are required by the language to be constant, and since all values of the initial attribute of static data must be constant, the compiler is able to initialize the static data at compi1c time.

The initialization is done by the code generator at the time it allocates the static data. The semantic translator transforms the internal representation so that it reflects the attributes semantics of the declared variables without reflecting the properties of the object machine. It makes a single scan over the internal representation of the program.

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A compiler, which had no equivalent of the optimizer phase and which did not separate the machine dependencies into a separate phase, could conceivably produce object code during this scan. The semantic translator consists of a set of recursive procedures which walk through the program tree.

The actions taken by these procedures are described by the general terms: operator transformation and operand processing. Operator transformation includes the creation of an explicit representation of each operator's result and the generation of conversion operators for those operands which require conversion. Operand processing determines the attributes, size and offsets of each operator's operands.

The meaning of an operator is determined by the attributes of its operands.