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document the byval parameter attribute.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45855 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2008-01-11 06:20:47 +00:00
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docs/LangRef.html
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@ -799,27 +799,41 @@ declare i32 @atoi(i8*) nounwind readonly
<dt><tt>zeroext</tt></dt>
<dd>This indicates that the parameter should be zero extended just before
a call to this function.</dd>
<dt><tt>signext</tt></dt>
<dd>This indicates that the parameter should be sign extended just before
a call to this function.</dd>
<dt><tt>inreg</tt></dt>
<dd>This indicates that the parameter should be placed in register (if
possible) during assembling function call. Support for this attribute is
target-specific</dd>
<dt><tt>byval</tt></dt>
<dd>This indicates that the pointer parameter is really an aggregate that
was passed by value to the function. The attribute implies that a hidden
copy of the struct is made between the caller and the callee, so the
callee is unable to modify the struct in the callee. This attribute is only
valid on llvm pointer arguments.</dd>
<dt><tt>sret</tt></dt>
<dd>This indicates that the parameter specifies the address of a structure
that is the return value of the function in the source program.</dd>
<dt><tt>noalias</tt></dt>
<dd>This indicates that the parameter not alias any other object or any
other "noalias" objects during the function call.
<dt><tt>noreturn</tt></dt>
<dd>This function attribute indicates that the function never returns. This
indicates to LLVM that every call to this function should be treated as if
an <tt>unreachable</tt> instruction immediately followed the call.</dd>
<dt><tt>nounwind</tt></dt>
<dd>This function attribute indicates that the function type does not use
the unwind instruction and does not allow stack unwinding to propagate
through it.</dd>
<dt><tt>nest</tt></dt>
<dd>This indicates that the parameter can be excised using the
<a href="#int_trampoline">trampoline intrinsics</a>.</dd>