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113 lines
3.6 KiB
Python
113 lines
3.6 KiB
Python
#!/usr/bin/python3
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# This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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# This code can be used to split lvmexecute.cpp VM switch into separate functions for use as native code generation fallbacks
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import sys
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import re
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input = sys.stdin.readlines()
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inst = ""
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header = """// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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// This file was generated by 'tools/lvmexecute_split.py' script, do not modify it by hand
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#pragma once
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#include <stdint.h>
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struct lua_State;
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struct Closure;
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typedef uint32_t Instruction;
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typedef struct lua_TValue TValue;
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typedef TValue* StkId;
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"""
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source = """// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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// This code is based on Lua 5.x implementation licensed under MIT License; see lua_LICENSE.txt for details
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// This file was generated by 'tools/lvmexecute_split.py' script, do not modify it by hand
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#include "Fallbacks.h"
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#include "FallbacksProlog.h"
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"""
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function = ""
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signature = ""
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includeInsts = ["LOP_NEWCLOSURE", "LOP_NAMECALL", "LOP_FORGPREP", "LOP_GETVARARGS", "LOP_DUPCLOSURE", "LOP_PREPVARARGS", "LOP_BREAK", "LOP_GETGLOBAL", "LOP_SETGLOBAL", "LOP_GETTABLEKS", "LOP_SETTABLEKS"]
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state = 0
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# parse with the state machine
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for line in input:
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# find the start of an instruction
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if state == 0:
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match = re.match("\s+VM_CASE\((LOP_[A-Z_0-9]+)\)", line)
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if match:
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inst = match[1]
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signature = "const Instruction* execute_" + inst + "(lua_State* L, const Instruction* pc, StkId base, TValue* k)"
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function = signature + "\n"
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function += "{\n"
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function += " [[maybe_unused]] Closure* cl = clvalue(L->ci->func);\n"
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state = 1
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# first line of the instruction which is "{"
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elif state == 1:
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assert(line == " {\n")
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state = 2
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# find the end of an instruction
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elif state == 2:
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# remove jumps back into the native code
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if line == "#if LUA_CUSTOM_EXECUTION\n":
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state = 3
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continue
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if line[0] == ' ':
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finalline = line[12:-1] + "\n"
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else:
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finalline = line
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finalline = finalline.replace("VM_NEXT();", "return pc;");
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finalline = finalline.replace("goto exit;", "return NULL;");
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finalline = finalline.replace("return;", "return NULL;");
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function += finalline
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match = re.match(" }", line)
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if match:
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# break is not supported
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if inst == "LOP_BREAK":
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function = "const Instruction* execute_" + inst + "(lua_State* L, const Instruction* pc, StkId base, TValue* k)\n"
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function += "{\n LUAU_ASSERT(!\"Unsupported deprecated opcode\");\n LUAU_UNREACHABLE();\n}\n"
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# handle fallthrough
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elif inst == "LOP_NAMECALL":
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function = function[:-len(finalline)]
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function += " return pc;\n}\n"
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if inst in includeInsts:
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header += signature + ";\n"
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source += function + "\n"
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state = 0
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# skip LUA_CUSTOM_EXECUTION code blocks
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elif state == 3:
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if line == "#endif\n":
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state = 4
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continue
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# skip extra line
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elif state == 4:
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state = 2
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# make sure we found the ending
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assert(state == 0)
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with open("Fallbacks.h", "w") as fp:
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fp.writelines(header)
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with open("Fallbacks.cpp", "w") as fp:
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fp.writelines(source)
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