diff options
| -rw-r--r-- | gas/ChangeLog | 5 | ||||
| -rw-r--r-- | gas/doc/as.texinfo | 33 |
2 files changed, 23 insertions, 15 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index 3d2feb9..09589a6 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,8 @@ +2015-05-06 Nick Clifton <nickc@redhat.com> + + * doc/as.texinfo (Dollar Local Labels): Note that these are only + supported on some targets. + 2015-05-06 Renlin Li <renlin.li@arm.com> * config/tc-aarch64.c (mapping_state): Recording alignment before exit. diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo index aac488e..b5e405a 100644 --- a/gas/doc/as.texinfo +++ b/gas/doc/as.texinfo @@ -3654,6 +3654,9 @@ on the H8/300), and underscores. Case of letters is significant: @code{foo} is a different symbol name than @code{Foo}. +Symbol names do not start with a digit. An exception to this rule is made for +Local Labels. See below. + Multibyte characters are supported. To generate a symbol name containing multibyte characters enclose it within double quotes and use escape codes. cf @xref{Strings}. Generating a multibyte symbol name from a label is not @@ -3685,15 +3688,15 @@ to retain the local symbols in the object files. @cindex local labels @cindex temporary symbol names @cindex symbol names, temporary -Local labels help compilers and programmers use names temporarily. -They create symbols which are guaranteed to be unique over the entire scope of -the input source code and which can be referred to by a simple notation. -To define a local label, write a label of the form @samp{@b{N}:} (where @b{N} -represents any positive integer). To refer to the most recent previous -definition of that label write @samp{@b{N}b}, using the same number as when -you defined the label. To refer to the next definition of a local label, write -@samp{@b{N}f}---the @samp{b} stands for ``backwards'' and the @samp{f} stands -for ``forwards''. +Local labels are different from local symbols. Local labels help compilers and +programmers use names temporarily. They create symbols which are guaranteed to +be unique over the entire scope of the input source code and which can be +referred to by a simple notation. To define a local label, write a label of +the form @samp{@b{N}:} (where @b{N} represents any positive integer). To refer +to the most recent previous definition of that label write @samp{@b{N}b}, using +the same number as when you defined the label. To refer to the next definition +of a local label, write @samp{@b{N}f}---the @samp{b} stands for ``backwards'' +and the @samp{f} stands for ``forwards''. There is no restriction on how you can use these labels, and you can reuse them too. So that it is possible to repeatedly define the same local label (using @@ -3758,12 +3761,12 @@ the 44th @code{3:} may be named @code{.L3@kbd{C-B}44}. @subheading Dollar Local Labels @cindex dollar local symbols -@code{@value{AS}} also supports an even more local form of local labels called -dollar labels. These labels go out of scope (i.e., they become undefined) as -soon as a non-local label is defined. Thus they remain valid for only a small -region of the input source code. Normal local labels, by contrast, remain in -scope for the entire file, or until they are redefined by another occurrence of -the same local label. +On some targets @code{@value{AS}} also supports an even more local form of +local labels called dollar labels. These labels go out of scope (i.e., they +become undefined) as soon as a non-local label is defined. Thus they remain +valid for only a small region of the input source code. Normal local labels, +by contrast, remain in scope for the entire file, or until they are redefined +by another occurrence of the same local label. Dollar labels are defined in exactly the same way as ordinary local labels, except that they have a dollar sign suffix to their numeric value, e.g., |