diff options
Diffstat (limited to 'docs/PCHInternals.html')
| -rw-r--r-- | docs/PCHInternals.html | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/docs/PCHInternals.html b/docs/PCHInternals.html index 109d5ed..d46ae5c 100644 --- a/docs/PCHInternals.html +++ b/docs/PCHInternals.html @@ -391,23 +391,23 @@ precompiled header, which contains the serialized representation of that statement or expression. Each substatement or subexpression within an expression is stored as a separate record (which keeps most records to a fixed size). Within the precompiled header, the -subexpressions of an expression are stored prior to the expression +subexpressions of an expression are stored, in reverse order, prior to the expression that owns those expression, using a form of <a href="http://en.wikipedia.org/wiki/Reverse_Polish_notation">Reverse Polish Notation</a>. For example, an expression <code>3 - 4 + 5</code> would be represented as follows:</p> <table border="1"> - <tr><td><code>IntegerLiteral(3)</code></td></tr> + <tr><td><code>IntegerLiteral(5)</code></td></tr> <tr><td><code>IntegerLiteral(4)</code></td></tr> + <tr><td><code>IntegerLiteral(3)</code></td></tr> <tr><td><code>BinaryOperator(-)</code></td></tr> - <tr><td><code>IntegerLiteral(5)</code></td></tr> <tr><td><code>BinaryOperator(+)</code></td></tr> <tr><td>STOP</td></tr> </table> <p>When reading this representation, Clang evaluates each expression -record it encounters, builds the appropriate abstract synax tree node, +record it encounters, builds the appropriate abstract syntax tree node, and then pushes that expression on to a stack. When a record contains <i>N</i> subexpressions--<code>BinaryOperator</code> has two of them--those expressions are popped from the top of the stack. The special STOP |
