diff options
Diffstat (limited to 'doc/langref.tex')
| -rw-r--r-- | doc/langref.tex | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/doc/langref.tex b/doc/langref.tex index 973769d4..5b91d01d 100644 --- a/doc/langref.tex +++ b/doc/langref.tex @@ -230,7 +230,7 @@ This prints: \end{verbatim} \end{vindent} Any larger number input to the function may exceed the MAXACTION or MAXNESTING -limits, which will be caught at run time and result in an error. For more +limits, which will be caught by the parser and result in an error. For more about limits see Section~\ref{sub:SystemTap-safety}. \newpage{} \subsection{The stap command} @@ -436,10 +436,8 @@ probe syscall.read = kernel.function("sys_read") { \index{epilogue-style aliases} \index{+=} The statement block that follows an alias definition is implicitly added -as an epilogue to any probe that refers to the alias. It is not useful -to define new variable there (since no subsequent code will see it), but -rather the code can take action based upon variables left set by the -prologue or by the user code. The following is an example: +as an epilogue to any probe that refers to the alias. The following is an +example: \begin{vindent} \begin{verbatim} @@ -447,15 +445,15 @@ prologue or by the user code. The following is an example: # epilogue. # probe syscall.read += kernel.function("sys_read") { - if (traceme) println ("tracing me") + fildes = $fd } \end{verbatim} \end{vindent} \subsubsection{Probe alias usage} -A probe alias is used the same way as any built-in probe type, by -naming it: +Another probe definition may use a previously defined alias. The following +is an example. \begin{vindent} \begin{verbatim} @@ -1029,6 +1027,12 @@ type conversions between strings and numbers. Inconsistent type-related use of identifiers signals an error. +\subsubsection{Numbers} +\index{numbers} +Numbers are 64-bit signed integers. The parser will also accept (and wrap +around) values above positive $2^{63}$. + + \subsubsection{Literals} \index{literals} Literals are either strings or integers. Literals can be expressed as decimal, @@ -1037,10 +1041,10 @@ octal, or hexadecimal, using C notation. Type suffixes (e.g., \emph{L} or \subsubsection{Integers\label{sub:Integers}} -\index{integers} \index{numbers} +\index{integers} Integers are decimal, hexadecimal, or octal, and use the same notation as in C. Integers are 64-bit signed quantities, although the parser also accepts -(and wraps around) values above positive $2^{63}$ but below $2^{64}$. +(and wraps around) values above positive $2^{63}$. \subsubsection{Strings\label{sub:Strings}} |