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| Next: <a href="Java-Trees.html#Java-Trees" accesskey="n" rel="next">Java Trees</a>, Previous: <a href="Language_002ddependent-trees.html#Language_002ddependent-trees" accesskey="p" rel="prev">Language-dependent trees</a>, Up: <a href="GENERIC.html#GENERIC" accesskey="u" rel="up">GENERIC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> |
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| <h3 class="section">10.10 C and C++ Trees</h3> |
| |
| <p>This section documents the internal representation used by GCC to |
| represent C and C++ source programs. When presented with a C or C++ |
| source program, GCC parses the program, performs semantic analysis |
| (including the generation of error messages), and then produces the |
| internal representation described here. This representation contains a |
| complete representation for the entire translation unit provided as |
| input to the front end. This representation is then typically processed |
| by a code-generator in order to produce machine code, but could also be |
| used in the creation of source browsers, intelligent editors, automatic |
| documentation generators, interpreters, and any other programs needing |
| the ability to process C or C++ code. |
| </p> |
| <p>This section explains the internal representation. In particular, it |
| documents the internal representation for C and C++ source |
| constructs, and the macros, functions, and variables that can be used to |
| access these constructs. The C++ representation is largely a superset |
| of the representation used in the C front end. There is only one |
| construct used in C that does not appear in the C++ front end and that |
| is the GNU “nested function” extension. Many of the macros documented |
| here do not apply in C because the corresponding language constructs do |
| not appear in C. |
| </p> |
| <p>The C and C++ front ends generate a mix of GENERIC trees and ones |
| specific to C and C++. These language-specific trees are higher-level |
| constructs than the ones in GENERIC to make the parser’s job easier. |
| This section describes those trees that aren’t part of GENERIC as well |
| as aspects of GENERIC trees that are treated in a language-specific |
| manner. |
| </p> |
| <p>If you are developing a “back end”, be it is a code-generator or some |
| other tool, that uses this representation, you may occasionally find |
| that you need to ask questions not easily answered by the functions and |
| macros available here. If that situation occurs, it is quite likely |
| that GCC already supports the functionality you desire, but that the |
| interface is simply not documented here. In that case, you should ask |
| the GCC maintainers (via mail to <a href="mailto:gcc@gcc.gnu.org">gcc@gcc.gnu.org</a>) about |
| documenting the functionality you require. Similarly, if you find |
| yourself writing functions that do not deal directly with your back end, |
| but instead might be useful to other people using the GCC front end, you |
| should submit your patches for inclusion in GCC. |
| </p> |
| <table class="menu" border="0" cellspacing="0"> |
| <tr><td align="left" valign="top">• <a href="Types-for-C_002b_002b.html#Types-for-C_002b_002b" accesskey="1">Types for C++</a>:</td><td> </td><td align="left" valign="top">Fundamental and aggregate types. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Namespaces.html#Namespaces" accesskey="2">Namespaces</a>:</td><td> </td><td align="left" valign="top">Namespaces. |
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| <tr><td align="left" valign="top">• <a href="Classes.html#Classes" accesskey="3">Classes</a>:</td><td> </td><td align="left" valign="top">Classes. |
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| <tr><td align="left" valign="top">• <a href="Functions-for-C_002b_002b.html#Functions-for-C_002b_002b" accesskey="4">Functions for C++</a>:</td><td> </td><td align="left" valign="top">Overloading and accessors for C++. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Statements-for-C_002b_002b.html#Statements-for-C_002b_002b" accesskey="5">Statements for C++</a>:</td><td> </td><td align="left" valign="top">Statements specific to C and C++. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="C_002b_002b-Expressions.html#C_002b_002b-Expressions" accesskey="6">C++ Expressions</a>:</td><td> </td><td align="left" valign="top">From <code>typeid</code> to <code>throw</code>. |
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| </table> |
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| Next: <a href="Java-Trees.html#Java-Trees" accesskey="n" rel="next">Java Trees</a>, Previous: <a href="Language_002ddependent-trees.html#Language_002ddependent-trees" accesskey="p" rel="prev">Language-dependent trees</a>, Up: <a href="GENERIC.html#GENERIC" accesskey="u" rel="up">GENERIC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> |
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