0ee6ffb257
Graphite is now available under: MIT OR MPL-2.0 OR LGPL-2.1-or-later OR GPL-2.0-or-later We pick MIT which is the same as Godot's main license for simplicity. Remove define to skip deprecation warnings, upstream fixed those.
116 lines
3.1 KiB
C++
116 lines
3.1 KiB
C++
// SPDX-License-Identifier: MIT OR MPL-2.0 OR LGPL-2.1-or-later OR GPL-2.0-or-later
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// Copyright 2010, SIL International, All rights reserved.
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// This call threaded interpreter implmentation for machine.h
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// Author: Tim Eves
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// Build either this interpreter or the direct_machine implementation.
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// The call threaded interpreter is portable across compilers and
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// architectures as well as being useful to debug (you can set breakpoints on
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// opcodes) but is slower that the direct threaded interpreter by a factor of 2
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#include <cassert>
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#include <cstring>
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#include <graphite2/Segment.h>
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#include "inc/Machine.h"
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#include "inc/Segment.h"
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#include "inc/Slot.h"
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#include "inc/Rule.h"
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// Disable the unused parameter warning as th compiler is mistaken since dp
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// is always updated (even if by 0) on every opcode.
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#ifdef __GNUC__
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#pragma GCC diagnostic ignored "-Wunused-parameter"
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#endif
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#define registers const byte * & dp, vm::Machine::stack_t * & sp, \
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vm::Machine::stack_t * const sb, regbank & reg
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// These are required by opcodes.h and should not be changed
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#define STARTOP(name) bool name(registers) REGPARM(4);\
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bool name(registers) {
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#define ENDOP return (sp - sb)/Machine::STACK_MAX==0; \
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}
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#define EXIT(status) { push(status); return false; }
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// This is required by opcode_table.h
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#define do_(name) instr(name)
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using namespace graphite2;
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using namespace vm;
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struct regbank {
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slotref is;
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slotref * map;
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SlotMap & smap;
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slotref * const map_base;
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const instr * & ip;
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uint8 direction;
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int8 flags;
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Machine::status_t & status;
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};
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typedef bool (* ip_t)(registers);
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// Pull in the opcode definitions
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// We pull these into a private namespace so these otherwise common names dont
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// pollute the toplevel namespace.
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namespace {
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#define smap reg.smap
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#define seg smap.segment
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#define is reg.is
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#define ip reg.ip
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#define map reg.map
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#define mapb reg.map_base
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#define flags reg.flags
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#define dir reg.direction
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#define status reg.status
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#include "inc/opcodes.h"
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#undef smap
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#undef seg
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#undef is
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#undef ip
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#undef map
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#undef mapb
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#undef flags
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#undef dir
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}
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Machine::stack_t Machine::run(const instr * program,
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const byte * data,
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slotref * & map)
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{
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assert(program != 0);
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// Declare virtual machine registers
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const instr * ip = program-1;
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const byte * dp = data;
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stack_t * sp = _stack + Machine::STACK_GUARD,
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* const sb = sp;
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regbank reg = {*map, map, _map, _map.begin()+_map.context(), ip, _map.dir(), 0, _status};
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// Run the program
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while ((reinterpret_cast<ip_t>(*++ip))(dp, sp, sb, reg)) {}
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const stack_t ret = sp == _stack+STACK_GUARD+1 ? *sp-- : 0;
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check_final_stack(sp);
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map = reg.map;
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*map = reg.is;
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return ret;
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}
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// Pull in the opcode table
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namespace {
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#include "inc/opcode_table.h"
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}
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const opcode_t * Machine::getOpcodeTable() throw()
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{
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return opcode_table;
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}
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