Tim Starling
73 linhas
2.3 KiB
C++
73 linhas
2.3 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#ifndef incl_HPHP_IMMSTACK_H_
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#define incl_HPHP_IMMSTACK_H_
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#include "hphp/runtime/vm/bytecode.h"
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namespace HPHP {
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///////////////////////////////////////////////////////////////////////////////
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class ImmStack {
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private:
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struct StackItem {
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enum StackType {
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StackType_Unknown,
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StackType_Int,
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StackType_Litstr,
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};
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StackType type;
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union {
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int64_t i64a;
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Id sa;
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};
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};
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public:
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// calls pop(), and pushUnknown() appropriately
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void processOpcode(const Opcode* opcode);
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void pushUnknown();
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void insUnknown(int pos);
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void pop();
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// By using these methods (instead of the popUknown() above) you signify that
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// the instruction most recently added via addInstr() is side-effect free,
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// i.e. that if this particular value on the stack is not needed then
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// the corresponding opcode can be removed. Thus we also cannot use
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// these methods for opcodes which push multiple values on to the stack,
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// such as dup.
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void pushInt(int64_t value);
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void pushLitstr(Id value);
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// 0 is the item most recently pushed on to the stack, followed by 1 etc.
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bool isInt(int above);
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bool isLitstr(Id above);
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StackItem &get(int above);
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private:
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std::vector<StackItem> m_stack;
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};
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///////////////////////////////////////////////////////////////////////////////
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}
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#endif
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