commit e6e8826870bee3facb04f950f0bd725f8a88623d
author Bill Wendling <isanbard@gmail.com> Fri Aug 12 20:24:12 2011 +0000
committer Bill Wendling <isanbard@gmail.com> Fri Aug 12 20:24:12 2011 +0000
tree 5fe10abfdbebc25ea75271004fe7afae60a3943e
parent 79628e92e1f903d50340d4cd3d1ea8c5fff63a87

Initial commit of the 'landingpad' instruction.

This implements the 'landingpad' instruction. It's used to indicate that a basic
block is a landing pad. There are several restrictions on its use (see
LangRef.html for more detail). These restrictions allow the exception handling
code to gather the information it needs in a much more sane way.

This patch has the definition, implementation, C interface, parsing, and bitcode
support in it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137501 91177308-0d34-0410-b5e6-96231b3b80d8

docs/LangRef.html

diff --git a/docs/LangRef.html b/docs/LangRef.html
index 2025020..725691c 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -6022,7 +6022,7 @@
   <resultval> = landingpad <somety> personality <type> <pers_fn> cleanup <clause>*
 
   <clause> := catch <type> <value>
-  <clause> := filter <type> <value> {, <type> <value>}*
+  <clause> := filter <array constant type> <array constant>
 </pre>
 
 <h5>Overview:</h5>
@@ -6041,9 +6041,11 @@
    <tt>cleanup</tt> flag indicates that the landing pad block is a cleanup.</p>
 
 <p>A <tt>clause</tt> begins with the clause type &mdash; <tt>catch</tt>
-   or <tt>filter</tt> &mdash; and contains a list of global variables
-   representing the "types" that may be caught or filtered respectively. The
-   '<tt>landingpad</tt>' instruction must contain <em>at least</em>
+   or <tt>filter</tt> &mdash; and contains the global variable representing the
+   "type" that may be caught or filtered respectively. Unlike the
+   <tt>catch</tt> clause, the <tt>filter</tt> clause takes an array constant as
+   its argument. Use "<tt>[0 x i8**] undef</tt>" for a filter which cannot
+   throw. The '<tt>landingpad</tt>' instruction must contain <em>at least</em>
    one <tt>clause</tt> or the <tt>cleanup</tt> flag.</p>
 
 <h5>Semantics:</h5>
@@ -6079,11 +6081,11 @@
            catch i8** @_ZTIi
   ;; A landing pad that is a cleanup.
   %res = landingpad { i8*, i32 } personality i32 (...)* @__gxx_personality_v0
-           cleanup  
+           cleanup
   ;; A landing pad which can catch an integer and can only throw a double.
   %res = landingpad { i8*, i32 } personality i32 (...)* @__gxx_personality_v0
            catch i8** @_ZTIi
-           filter i8** @_ZTId
+           filter [1 x i8**] [@_ZTId]
 </pre>
 
 </div>