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Printer Modules

Description

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A Printer module encodes the instructions necessary to print intermediate code to a specific programming language.

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As used above, the term printing refers to the process of translating intermediate code into a string which encodes the equivalent commands in some specific programming language.

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Every translator has an associated Printer module.  In particular, each language definition module must have an export named Printer, which corresponds to a Printer module.

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Essentially, for each name nm in CodeGeneration:-Names, a Printer supplies a Print Handler, which is responsible for ``printing'' (i.e. translating) any subexpression of the Intermediate Code structure that has nm as its zeroth operand.

Creating a Printer module

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To create a new, generic Printer module, you can call CodeGeneration[LanguageDefinition][DefaultPrinter]().

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It is frequently desirable, however, to use the Printer module from some existing language definition.  This is particularly useful when ``extending'' an existing translator, or when the many but not all of the details of translation for the new language are identical to those of an existing one. To make a copy of the Printer module for language name langname, you can call CodeGeneration[LanguageDefinition][Get](langname):-Printer.

Customizing a Printer module

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Once obtained, a Printer module can be transformed and customized by calling its package functions.  The following table lists the package functions of a Printer module.

AddFunction

AddFunctions

AddLibrary

AddOperator

AddPrintHandler

AddType

ApplyLanguageAttribute

Comment

Endline

GetExpressionType

GetFunction

GetFunctionSignature

GetIncludes

GetLanguageAttribute

GetOperator

GetPrecedence

GetPrintHandler

GetScopeName

GetScopeStructure

GetType

Indent

PopIndentation

Print

PrintBinary

PrintDelimitedList

PrintParentheses

PrintStatementBlock

PrintTarget

PrintUnary

PushIndentation

SetLanguageAttribute

SetPrecedence

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For examples of creating and customizing a Printer module, see DefaultPrinter, or Get.

See Also

DefaultPrinter, Get, LanguageModule, Print


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