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c-tree.texi (VAR_DECL): Describe representation of GCC's extension for placing variables in particular...

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* c-tree.texi (VAR_DECL): Describe representation of GCC's
	extension for placing variables in particular registers.

From-SVN: r37322
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Mark Mitchell 2000-11-08 19:25:36 +00:00 committed by Mark Mitchell
parent c39c0db36c
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@ -1,5 +1,8 @@
2000-11-08 Mark Mitchell <mark@codesourcery.com>
* c-tree.texi (VAR_DECL): Describe representation of GCC's
extension for placing variables in particular registers.
* c-tree.texi (FUNCTION_TYPE): Clarify TYPE_ARG_TYPES for
unprototyped C functions with no parameters.

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gcc/c-tree.texi
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@ -991,6 +991,13 @@ performed. If the @code{DECL_INITIAL} is the @code{error_mark_node},
there is an initializer, but it is given by an explicit statement later
in the code; no bitwise copy is required.
GCC provides an extension that allows either automatic variables, or
global variables, to be placed in particular registers. This extension
is being used for a particular @code{VAR_DECL} if @code{DECL_REGISTER}
holds for the @code{VAR_DECL}, and if @code{DECL_ASSEMBLER_NAME} is not
equal to @code{DECL_NAME}. In that case, @code{DECL_ASSEMBLER_NAME} is
the name of the register into which the variable will be placed.
@item PARM_DECL
Used to represent a parameter to a function. Treat these nodes
similarly to @code{VAR_DECL} nodes. These nodes only appear in the