2 +----------------------------------------------------------------------+
4 +----------------------------------------------------------------------+
5 | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com) |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
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12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
16 #ifndef incl_HHBBC_DCE_H_
17 #define incl_HHBBC_DCE_H_
21 #include "hphp/runtime/base/type-string.h"
23 #include "hphp/hhbbc/misc.h"
25 namespace HPHP
{ namespace HHBBC
{
33 namespace php
{ struct Block
; }
35 //////////////////////////////////////////////////////////////////////
38 * Perform DCE on a single basic block.
40 void local_dce(const Index
&, const FuncAnalysis
&, CollectedInfo
& collect
,
41 BlockId bid
, const State
&);
44 * Eliminate dead code in a function, across basic blocks, based on
45 * results from a previous analyze_func call.
47 * Returns true if we should re-run the optimizer.
49 bool global_dce(const Index
&, const FuncAnalysis
&);
51 //////////////////////////////////////////////////////////////////////
53 const StaticString
s_unreachable("static analysis error: supposedly "
54 "unreachable code was reached");
56 //////////////////////////////////////////////////////////////////////