Reduced size of zend_op on 64-bit systems.

the main idea - the smaller the zend_op structure, the lees memory traffic is required to load VM instructions during execution. The patch reduces

Reduced size of zend_op on 64-bit systems.

the main idea - the smaller the zend_op structure, the lees memory traffic is required to load VM instructions during execution. The patch reduces the size of each opcode from 48 to 32 bytes (saves 16 bytes for each opcode, and applications use thousands of opoceds). This reduced the number of CPU cache misses by 12% and improved performance of real-life apps by 1-2%.

The patch affects how constants and jump targets are represented in VM during execution. Previously they were implemented as absolute 64-bit pointers. Now they are relative 32-bit offsets.

In run-time constant now should be accessed as:
RT_CONSTANT(op_array, opine->op1) instead of opline->op1.zv
EX_CONSTANT(opline->op1) instead of opline->op1.zv

Jump targets:
OP_JMP_ADDR(opline, opline->op2) instead of opline->op2.jmp_addr

The patch doesn't change zend_op representation for 32-bit systems. They still use absolute addresses. The compile-time representation is also kept the same.

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Use DECLARE_CONST instruction instead of call to internal define() function when possible

Added constant expression evaluation for "dirname(__FILE__)".
Improved constant expression evaluation for function calls

We can't eliminate FETCH_CONSTANT opcodes for constants represented by AST.

Opcache compatibility for coalesce operator

Make QM_ASSIGN, JMP_SET and CAST return IS_TMP_VAR.

Removed ZEND_QM_ASSIGN_VAR and ZEND_JMP_SET_VAR opcodes (in PHPNG they did exacly the same as ZEND_QM_ASSIGN and ZEND_JMP_SET)

Refactored optimizer (compile different opimizer passes separately, instead of including *.c file)

Fixed return operand type (Use IS_TMP_VAR instead of IS_VAR in the same way as it was before AST patch)

master renames phase 7

master renames phase 2

master renames phase 1

basic macro replacements, all at once

ZEND_STRLEN and ZEND_DEFINED have IS_VAR results for now

This avoids issues with calls being expected to have an IS_VAR
result

Add copyright header

Remove old version PHP supports

Implemented builtin instruction for strlen()

Implemented builtin instruction for strlen()

Removed EG(in_execution). If EG(currentent_execute_data) is not NULL we are executing something.

Removed EG(active_op_array) and use corresponding value from EG(current_execute_data)

Refactored parameter passing mechanism.

In PHP-5.6 and below each argument passed to user function was copies on VM stack twice.
Now we always have ZEND_INIT_FCALL (or simular) opcode th

Refactored parameter passing mechanism.

In PHP-5.6 and below each argument passed to user function was copies on VM stack twice.
Now we always have ZEND_INIT_FCALL (or simular) opcode that pushes "call frame" on top of VM stack.
"Call frame" is actually the same zend_execute_data structure.
All the following ZEND_SEND instructions push arguments on top of the stack in a way that they directly comes into corresponding CV variables of the called frame. Extra arguments are copied at the end of stack frame (after all CV and TMP variables) on function enterance.

There are two minor incompatibilities:
1) It's not allowed to decalre functions redefining arguments e.g. "function foo($a,$a) {}".
2) func_get_arg() and func_get args() return the current value of argument and not the original value that was sent.

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Use arena allocator for optimizer temporary data structures

Optimize ZEND_POW (Rouven Weßling)

Split IS_BOOL into IS_FALSE and IS_TRUE

Optimized constant lookup