size_PS = 1000 # Parameter stack size
size_TIB = 1000 # Terminal input buffer size
-# The mem array constitutes the memory of the VM. It has the following geography:
-#
-# mem = +-----------------------+
-# | Built-in Variables |
-# +-----------------------+
-# | Return Stack |
-# +-----------------------+
-# | Parameter Stack |
-# +-----------------------+
-# | Terminal Input Buffer |
-# +-----------------------+
-# | Dictionary |
-# +-----------------------+
-#
-# Note that all words (user-defined, primitive, variables, etc) are included in
-# the dictionary.
-#
-# Simple linear addressing is used with one exception: references to primitive code
-# blocks, which are represented as anonymous functions, appear as negative indicies
-# into the primitives array which contains these functions.
-
+# Memory arrays
mem = Array{Int64,1}(size_mem)
primitives = Array{Function,1}()
primNames = Array{ASCIIString,1}()
# Built-in variables
nextVarAddr = 1
-HERE = nextVarAddr; nextVarAddr += 1
+H = nextVarAddr; nextVarAddr += 1
LATEST = nextVarAddr; nextVarAddr += 1
RSP0 = nextVarAddr # bottom of RS
PSP0 = RSP0 + size_RS # bottom of PS
TIB = PSP0 + size_PS # address of terminal input buffer
-mem[HERE] = TIB + size_TIB # location of bottom of dictionary
+mem[H] = TIB + size_TIB # location of bottom of dictionary
mem[LATEST] = 0 # no previous definition
-DICT = mem[HERE] # Save bottom of dictionary as constant
+DICT = mem[H] # Save bottom of dictionary as constant
# VM registers
type Reg
# Stack manipulation functions
-type ParamStackUnderflow <: Exception end
-type ReturnStackUnderflow <: Exception end
-
-Base.showerror(io::IO, ex::ParamStackUnderflow) = print(io, "Parameter stack underflow.")
-Base.showerror(io::IO, ex::ReturnStackUnderflow) = print(io, "Return stack underflow.")
-
-getRSDepth() = reg.RSP - RSP0
-getPSDepth() = reg.PSP - PSP0
-
function ensurePSDepth(depth::Int64)
- if getPSDepth()<depth
- throw(ParamStackUnderflow())
+ if reg.PSP - PSP0 < depth
+ error("Parameter stack underflow.")
end
end
function ensureRSDepth(depth::Int64)
- if getRSDepth()<depth
- throw(ReturnStackUnderflow())
+ if reg.RSP - RSP0 < depth
+ error("Return stack underflow.")
end
end
# Word creation functions
-F_IMMED = 128
-F_HIDDEN = 256
-F_LENMASK = 127
+F_LENMASK = 31
+F_IMMED = 32
+F_HIDDEN = 64
+NFA_MARK = 128
function createHeader(name::AbstractString, flags::Int64)
- mem[mem[HERE]] = mem[LATEST]
- mem[LATEST] = mem[HERE]
- mem[HERE] += 1
+ mem[mem[H]] = mem[LATEST]
+ mem[LATEST] = mem[H]
+ mem[H] += 1
- mem[mem[HERE]] = length(name) | flags; mem[HERE] += 1
- putString(name, mem[HERE]); mem[HERE] += length(name)
+ mem[mem[H]] = length(name) | flags | NFA_MARK; mem[H] += 1
+ putString(name, mem[H]); mem[H] += length(name)
end
function defPrimWord(name::AbstractString, f::Function; flags::Int64=0)
createHeader(name, flags)
- codeWordAddr = mem[HERE]
+ codeWordAddr = mem[H]
mem[codeWordAddr] = defPrim(f, name=name)
- mem[HERE] += 1
+ mem[H] += 1
return codeWordAddr
end
function defWord(name::AbstractString, wordAddrs::Array{Int64,1}; flags::Int64=0)
createHeader(name, flags)
- addr = mem[HERE]
- mem[mem[HERE]] = DOCOL
- mem[HERE] += 1
+ addr = mem[H]
+ mem[mem[H]] = DOCOL
+ mem[H] += 1
for wordAddr in wordAddrs
- mem[mem[HERE]] = wordAddr
- mem[HERE] += 1
+ mem[mem[H]] = wordAddr
+ mem[H] += 1
end
return addr
function defNewVar(name::AbstractString, initial::Int64; flags::Int64=0)
createHeader(name, flags)
- codeWordAddr = mem[HERE]
- varAddr = mem[HERE] + 1
+ codeWordAddr = mem[H]
+ varAddr = mem[H] + 1
- mem[mem[HERE]] = DOVAR; mem[HERE] += 1
- mem[mem[HERE]] = initial; mem[HERE] += 1
+ mem[mem[H]] = DOVAR; mem[H] += 1
+ mem[mem[H]] = initial; mem[H] += 1
return varAddr, codeWordAddr
end
function defConst(name::AbstractString, val::Int64; flags::Int64=0)
createHeader(name, flags)
- codeWordAddr = mem[HERE]
+ codeWordAddr = mem[H]
- mem[mem[HERE]] = DOCON; mem[HERE] += 1
- mem[mem[HERE]] = val; mem[HERE] += 1
+ mem[mem[H]] = DOCON; mem[H] += 1
+ mem[mem[H]] = val; mem[H] += 1
return codeWordAddr
end
return NEXT
end, name="DOVAR")
-EXIT = defPrimWord("EXIT", () -> begin
+EXIT_CFA = defPrimWord("EXIT", () -> begin
reg.IP = popRS()
return NEXT
end)
# Dictionary entries for core built-in variables, constants
-HERE_CFA = defExistingVar("HERE", HERE)
+H_CFA = defExistingVar("H", H)
LATEST_CFA = defExistingVar("LATEST", LATEST)
PSP0_CFA = defConst("PSP0", PSP0)
F_IMMED_CFA = defConst("F_IMMED", F_IMMED)
F_HIDDEN_CFA = defConst("F_HIDDEN", F_HIDDEN)
F_LENMASK_CFA = defConst("F_LENMASK", F_LENMASK)
+NFA_MARK_CFA = defConst("NFA_MARK", NFA_MARK)
# Basic forth primitives
-DROP = defPrimWord("DROP", () -> begin
+DROP_CFA = defPrimWord("DROP", () -> begin
popPS()
return NEXT
end)
-SWAP = defPrimWord("SWAP", () -> begin
+SWAP_CFA = defPrimWord("SWAP", () -> begin
a = popPS()
b = popPS()
pushPS(a)
return NEXT
end)
-DUP = defPrimWord("DUP", () -> begin
+DUP_CFA = defPrimWord("DUP", () -> begin
ensurePSDepth(1)
pushPS(mem[reg.PSP])
return NEXT
end)
-OVER = defPrimWord("OVER", () -> begin
+OVER_CFA = defPrimWord("OVER", () -> begin
ensurePSDepth(2)
pushPS(mem[reg.PSP-1])
return NEXT
end)
-ROT = defPrimWord("ROT", () -> begin
+ROT_CFA = defPrimWord("ROT", () -> begin
a = popPS()
b = popPS()
c = popPS()
return NEXT
end)
-NROT = defPrimWord("-ROT", () -> begin
+NROT_CFA = defPrimWord("-ROT", () -> begin
a = popPS()
b = popPS()
c = popPS()
end)
-TWODROP = defPrimWord("2DROP", () -> begin
+TWODROP_CFA = defPrimWord("2DROP", () -> begin
popPS()
popPS()
return NEXT
end)
-TWODUP = defPrimWord("2DUP", () -> begin
+TWODUP_CFA = defPrimWord("2DUP", () -> begin
ensurePSDepth(2)
a = mem[reg.PSP-1]
b = mem[reg.PSP]
return NEXT
end)
-TWOSWAP = defPrimWord("2SWAP", () -> begin
+TWOSWAP_CFA = defPrimWord("2SWAP", () -> begin
a = popPS()
b = popPS()
c = popPS()
return NEXT
end)
-TWOOVER = defPrimWord("2OVER", () -> begin
+TWOOVER_CFA = defPrimWord("2OVER", () -> begin
ensurePSDepth(4)
a = mem[reg.PSP-3]
b = mem[reg.PSP-2]
return NEXT
end)
-QDUP = defPrimWord("?DUP", () -> begin
+QDUP_CFA = defPrimWord("?DUP", () -> begin
ensurePSDepth(1)
val = mem[reg.PSP]
if val != 0
return NEXT
end)
-INCR = defPrimWord("1+", () -> begin
+INCR_CFA = defPrimWord("1+", () -> begin
ensurePSDepth(1)
mem[reg.PSP] += 1
return NEXT
end)
-DECR = defPrimWord("1-", () -> begin
+DECR_CFA = defPrimWord("1-", () -> begin
ensurePSDepth(1)
mem[reg.PSP] -= 1
return NEXT
end)
-INCR2 = defPrimWord("2+", () -> begin
+INCR2_CFA = defPrimWord("2+", () -> begin
ensurePSDepth(1)
mem[reg.PSP] += 2
return NEXT
end)
-DECR2 = defPrimWord("2-", () -> begin
+DECR2_CFA = defPrimWord("2-", () -> begin
ensurePSDepth(1)
mem[reg.PSP] -= 2
return NEXT
end)
-ADD = defPrimWord("+", () -> begin
+ADD_CFA = defPrimWord("+", () -> begin
b = popPS()
a = popPS()
pushPS(a+b)
return NEXT
end)
-SUB = defPrimWord("-", () -> begin
+SUB_CFA = defPrimWord("-", () -> begin
b = popPS()
a = popPS()
pushPS(a-b)
return NEXT
end)
-MUL = defPrimWord("*", () -> begin
+MUL_CFA = defPrimWord("*", () -> begin
b = popPS()
a = popPS()
pushPS(a*b)
return NEXT
end)
-DIVMOD = defPrimWord("/MOD", () -> begin
+DIVMOD_CFA = defPrimWord("/MOD", () -> begin
b = popPS()
a = popPS()
q,r = divrem(a,b)
return NEXT
end)
-TWOMUL = defPrimWord("2*", () -> begin
+TWOMUL_CFA = defPrimWord("2*", () -> begin
pushPS(popPS() << 1)
return NEXT
end)
-TWODIV = defPrimWord("2/", () -> begin
+TWODIV_CFA = defPrimWord("2/", () -> begin
pushPS(popPS() >> 1)
return NEXT
end)
-EQ = defPrimWord("=", () -> begin
+EQ_CFA = defPrimWord("=", () -> begin
b = popPS()
a = popPS()
pushPS(a==b ? -1 : 0)
return NEXT
end)
-NE = defPrimWord("<>", () -> begin
+NE_CFA = defPrimWord("<>", () -> begin
b = popPS()
a = popPS()
pushPS(a!=b ? -1 : 0)
return NEXT
end)
-LT = defPrimWord("<", () -> begin
+LT_CFA = defPrimWord("<", () -> begin
b = popPS()
a = popPS()
pushPS(a<b ? -1 : 0)
return NEXT
end)
-GT = defPrimWord(">", () -> begin
+GT_CFA = defPrimWord(">", () -> begin
b = popPS()
a = popPS()
pushPS(a>b ? -1 : 0)
return NEXT
end)
-LE = defPrimWord("<=", () -> begin
+LE_CFA = defPrimWord("<=", () -> begin
b = popPS()
a = popPS()
pushPS(a<=b ? -1 : 0)
return NEXT
end)
-GE = defPrimWord(">=", () -> begin
+GE_CFA = defPrimWord(">=", () -> begin
b = popPS()
a = popPS()
pushPS(a>=b ? -1 : 0)
return NEXT
end)
-ZE = defPrimWord("0=", () -> begin
+ZE_CFA = defPrimWord("0=", () -> begin
pushPS(popPS() == 0 ? -1 : 0)
return NEXT
end)
-ZNE = defPrimWord("0<>", () -> begin
+ZNE_CFA = defPrimWord("0<>", () -> begin
pushPS(popPS() != 0 ? -1 : 0)
return NEXT
end)
-ZLT = defPrimWord("0<", () -> begin
+ZLT_CFA = defPrimWord("0<", () -> begin
pushPS(popPS() < 0 ? -1 : 0)
return NEXT
end)
-ZGT = defPrimWord("0>", () -> begin
+ZGT_CFA = defPrimWord("0>", () -> begin
pushPS(popPS() > 0 ? -1 : 0)
return NEXT
end)
-ZLE = defPrimWord("0<=", () -> begin
+ZLE_CFA = defPrimWord("0<=", () -> begin
pushPS(popPS() <= 0 ? -1 : 0)
return NEXT
end)
-ZGE = defPrimWord("0>=", () -> begin
+ZGE_CFA = defPrimWord("0>=", () -> begin
pushPS(popPS() >= 0 ? -1 : 0)
return NEXT
end)
-AND = defPrimWord("AND", () -> begin
+AND_CFA = defPrimWord("AND", () -> begin
b = popPS()
a = popPS()
pushPS(a & b)
return NEXT
end)
-OR = defPrimWord("OR", () -> begin
+OR_CFA = defPrimWord("OR", () -> begin
b = popPS()
a = popPS()
pushPS(a | b)
return NEXT
end)
-XOR = defPrimWord("XOR", () -> begin
+XOR_CFA = defPrimWord("XOR", () -> begin
b = popPS()
a = popPS()
pushPS(a $ b)
return NEXT
end)
-INVERT = defPrimWord("INVERT", () -> begin
+INVERT_CFA = defPrimWord("INVERT", () -> begin
pushPS(~popPS())
return NEXT
end)
# Literals
-LIT = defPrimWord("LIT", () -> begin
+LIT_CFA = defPrimWord("LIT", () -> begin
pushPS(mem[reg.IP])
reg.IP += 1
return NEXT
# Memory primitives
-STORE = defPrimWord("!", () -> begin
+STORE_CFA = defPrimWord("!", () -> begin
addr = popPS()
dat = popPS()
mem[addr] = dat
return NEXT
end)
-FETCH = defPrimWord("@", () -> begin
+FETCH_CFA = defPrimWord("@", () -> begin
addr = popPS()
pushPS(mem[addr])
return NEXT
end)
-ADDSTORE = defPrimWord("+!", () -> begin
+ADDSTORE_CFA = defPrimWord("+!", () -> begin
addr = popPS()
toAdd = popPS()
mem[addr] += toAdd
return NEXT
end)
-SUBSTORE = defPrimWord("-!", () -> begin
+SUBSTORE_CFA = defPrimWord("-!", () -> begin
addr = popPS()
toSub = popPS()
mem[addr] -= toSub
# Return Stack
-TOR = defPrimWord(">R", () -> begin
+TOR_CFA = defPrimWord(">R", () -> begin
pushRS(popPS())
return NEXT
end)
-FROMR = defPrimWord("R>", () -> begin
+FROMR_CFA = defPrimWord("R>", () -> begin
pushPS(popRS())
return NEXT
end)
-RFETCH = defPrimWord("R@", () -> begin
+RFETCH_CFA = defPrimWord("R@", () -> begin
pushPS(mem[reg.RSP])
return NEXT
end)
-RSPFETCH = defPrimWord("RSP@", () -> begin
+RSPFETCH_CFA = defPrimWord("RSP@", () -> begin
pushPS(reg.RSP)
return NEXT
end)
-RSPSTORE = defPrimWord("RSP!", () -> begin
+RSPSTORE_CFA = defPrimWord("RSP!", () -> begin
reg.RSP = popPS()
return NEXT
end)
-RDROP = defPrimWord("RDROP", () -> begin
+RDROP_CFA = defPrimWord("RDROP", () -> begin
popRS()
return NEXT
end)
# Parameter Stack
-PSPFETCH = defPrimWord("PSP@", () -> begin
+PSPFETCH_CFA = defPrimWord("PSP@", () -> begin
pushPS(reg.PSP)
return NEXT
end)
-PSPSTORE = defPrimWord("PSP!", () -> begin
+PSPSTORE_CFA = defPrimWord("PSP!", () -> begin
reg.PSP = popPS()
return NEXT
end)
# Working Register
-WFETCH = defPrimWord("W@", () -> begin
+WFETCH_CFA = defPrimWord("W@", () -> begin
pushPS(reg.W)
return NEXT
end)
-WSTORE = defPrimWord("W!", () -> begin
+WSTORE_CFA = defPrimWord("W!", () -> begin
reg.W = popPS()
return NEXT
end)
sources = Array{Any,1}()
currentSource() = sources[length(sources)]
-EOF = defPrimWord("\x04", () -> begin
- close(pop!(sources))
- if !isempty(sources)
+EOF_CFA = defPrimWord("\x04", () -> begin
+ if currentSource() != STDIN
+ close(pop!(sources))
return NEXT
else
return 0
end
end)
-EMIT = defPrimWord("EMIT", () -> begin
+EMIT_CFA = defPrimWord("EMIT", () -> begin
print(Char(popPS()))
return NEXT
end)
+function raw_mode!(mode::Bool)
+ if ccall(:jl_tty_set_mode, Int32, (Ptr{Void}, Int32), STDIN.handle, mode) != 0
+ throw("FATAL: Terminal unable to enter raw mode.")
+ end
+end
+
+function getKey()
+ raw_mode!(true)
+ byte = readbytes(STDIN, 1)[1]
+ raw_mode!(false)
+
+ if byte == 0x0d
+ return 0x0a
+ elseif byte == 127
+ return 0x08
+ else
+ return byte
+ end
+end
+
+KEY_CFA = defPrimWord("KEY", () -> begin
+ pushPS(Int(getKey()))
+ return NEXT
+end)
+
+function getLineFromSTDIN()
+ line = ""
+ while true
+ key = Char(getKey())
+
+ if key == '\n'
+ print(" ")
+ return ASCIIString(line)
+
+ elseif key == '\x04'
+ if isempty(line)
+ return string("\x04")
+ end
+
+ elseif key == '\b'
+ if !isempty(line)
+ line = line[1:length(line)-1]
+ print("\b \b")
+ end
+
+ elseif key == '\e'
+ # Strip ANSI escape sequence
+ nextKey = Char(getKey())
+ if nextKey == '['
+ while true
+ nextKey = Char(getKey())
+ if nextKey >= '@' || nextKey <= '~'
+ break
+ end
+ end
+ end
+
+ else
+ print(key)
+ line = string(line, key)
+ end
+ end
+end
+
SPAN, SPAN_CFA = defNewVar("SPAN", 0)
-EXPECT = defPrimWord("EXPECT", () -> begin
+EXPECT_CFA = defPrimWord("EXPECT", () -> begin
maxLen = popPS()
addr = popPS()
- if !eof(currentSource())
- line = chomp(readline(currentSource()))
- mem[SPAN] = min(length(line), maxLen)
- putString(line[1:mem[SPAN]], addr)
+ if currentSource() == STDIN
+ line = getLineFromSTDIN()
else
- mem[SPAN] = 1
- mem[addr] = 4 # eof
+ if !eof(currentSource())
+ line = chomp(readline(currentSource()))
+ else
+ line = "\x04" # eof
+ end
end
+ mem[SPAN] = min(length(line), maxLen)
+ putString(line[1:mem[SPAN]], addr)
+
return NEXT
end)
BASE, BASE_CFA = defNewVar("BASE", 10)
-NUMBER = defPrimWord("NUMBER", () -> begin
+NUMBER_CFA = defPrimWord("NUMBER", () -> begin
wordAddr = popPS()+1
wordLen = mem[wordAddr-1]
# Dictionary searches
-FIND = defPrimWord("FIND", () -> begin
+TOCFA_CFA = defPrimWord(">CFA", () -> begin
+
+ addr = popPS()
+ lenAndFlags = mem[addr+1]
+ len = lenAndFlags & F_LENMASK
+
+ pushPS(addr + 2 + len)
+
+ return NEXT
+end)
+
+TOBODY_CFA = defWord(">BODY", [INCR_CFA, EXIT_CFA])
+
+FIND_CFA = defPrimWord("FIND", () -> begin
countedAddr = popPS()
wordAddr = countedAddr + 1
word = lowercase(getString(wordAddr, wordLen))
latest = LATEST
+ lenAndFlags = 0
i = 0
while (latest = mem[latest]) > 0
end
end
- pushPS(latest)
-
- return NEXT
-end)
-
-TOCFA = defPrimWord(">CFA", () -> begin
-
- addr = popPS()
- lenAndFlags = mem[addr+1]
- len = lenAndFlags & F_LENMASK
-
- pushPS(addr + 2 + len)
+ if latest > 0
+ pushPS(latest)
+ callPrim(mem[TOCFA_CFA])
+ if (lenAndFlags & F_IMMED) == F_IMMED
+ pushPS(1)
+ else
+ pushPS(-1)
+ end
+ else
+ pushPS(countedAddr)
+ pushPS(0)
+ end
return NEXT
end)
-TOPFA = defWord(">PFA", [TOCFA, INCR, EXIT])
# Branching
-BRANCH = defPrimWord("BRANCH", () -> begin
+BRANCH_CFA = defPrimWord("BRANCH", () -> begin
reg.IP += mem[reg.IP]
return NEXT
end)
-ZBRANCH = defPrimWord("0BRANCH", () -> begin
+ZBRANCH_CFA = defPrimWord("0BRANCH", () -> begin
if (popPS() == 0)
reg.IP += mem[reg.IP]
else
# Strings
-LITSTRING = defPrimWord("LITSTRING", () -> begin
+LITSTRING_CFA = defPrimWord("LITSTRING", () -> begin
len = mem[reg.IP]
reg.IP += 1
pushPS(reg.IP)
return NEXT
end)
-TYPE = defPrimWord("TYPE", () -> begin
+TYPE_CFA = defPrimWord("TYPE", () -> begin
len = popPS()
addr = popPS()
str = getString(addr, len)
return NEXT
end)
-# Outer interpreter
-
-TRACE = defPrimWord("TRACE", () -> begin
- println("reg.W: $(reg.W) reg.IP: $(reg.IP)")
- print("PS: "); printPS()
- print("RS: "); printRS()
- print("[paused]")
- readline()
-
- return NEXT
-end)
-
-COMMA = defPrimWord(",", () -> begin
- mem[mem[HERE]] = popPS()
- mem[HERE] += 1
-
- return NEXT
-end)
-
-BTICK = defWord("[']",
- [FROMR, DUP, INCR, TOR, FETCH, EXIT])
-
-EXECUTE = defPrimWord("EXECUTE", () -> begin
- reg.W = popPS()
- return mem[reg.W]
-end)
+# Interpreter/Compiler-specific I/O
TIB_CFA = defConst("TIB", TIB)
NUMTIB, NUMTIB_CFA = defNewVar("#TIB", 0)
TOIN, TOIN_CFA = defNewVar(">IN", 0)
-QUERY = defWord("QUERY",
- [TIB_CFA, LIT, 160, EXPECT,
- SPAN_CFA, FETCH, NUMTIB_CFA, STORE,
- LIT, 0, TOIN_CFA, STORE,
- EXIT])
+QUERY_CFA = defWord("QUERY",
+ [TIB_CFA, LIT_CFA, 160, EXPECT_CFA,
+ SPAN_CFA, FETCH_CFA, NUMTIB_CFA, STORE_CFA,
+ LIT_CFA, 0, TOIN_CFA, STORE_CFA,
+ EXIT_CFA])
-WORD = defPrimWord("WORD", () -> begin
+WORD_CFA = defPrimWord("WORD", () -> begin
delim = popPS()
# Chew up initial occurrences of delim
mem[TOIN] += 1
end
- countAddr = mem[HERE]
- addr = mem[HERE]+1
+ countAddr = mem[H]
+ addr = mem[H]+1
# Start reading in word
count = 0
return NEXT
end)
-PARSE = defPrimWord("PARSE", () -> begin
- delim = popPS()
+# Compilation
- # Chew up initial occurrences of delim
- addr = mem[HERE]
+STATE, STATE_CFA = defNewVar("STATE", 0)
- # Start reading input stream
- count = 0
- while (mem[TOIN]<mem[NUMTIB])
- mem[addr] = mem[TIB+mem[TOIN]]
- mem[TOIN] += 1
+COMMA_CFA = defPrimWord(",", () -> begin
+ mem[mem[H]] = popPS()
+ mem[H] += 1
- if (mem[addr] == delim)
- break
- end
+ return NEXT
+end)
- count += 1
- addr += 1
- end
+HERE_CFA = defWord("HERE",
+ [H_CFA, FETCH_CFA, EXIT_CFA])
- pushPS(addr)
- pushPS(count)
+HEADER_CFA = defPrimWord("HEADER", () -> begin
+ wordAddr = popPS()+1
+ wordLen = mem[wordAddr-1]
+ word = getString(wordAddr, wordLen)
+
+ createHeader(word, 0)
return NEXT
end)
-BYE = defPrimWord("BYE", () -> begin
- println("Bye!")
- return 0
+CREATE_CFA = defWord("CREATE",
+ [LIT_CFA, 32, WORD_CFA, HEADER_CFA,
+ LIT_CFA, DOVAR, COMMA_CFA,
+ EXIT_CFA])
+
+DODOES = defPrim(() -> begin
+ pushRS(reg.IP)
+ reg.IP = popPS()
+ pushPS(reg.W + 1)
+ return NEXT
+end, name="DODOES")
+
+DOES_HELPER_CFA = defPrimWord("(DOES>)", () -> begin
+
+ pushPS(mem[LATEST])
+ callPrim(mem[TOCFA_CFA])
+ cfa = popPS()
+
+ runtimeAddr = popPS()
+
+ mem[cfa] = defPrim(eval(:(() -> begin
+ pushPS($(runtimeAddr))
+ return DODOES
+ end)), name="doesPrim")
+
+ return NEXT
+end, flags=F_IMMED)
+
+DOES_CFA = defWord("DOES>",
+ [LIT_CFA, LIT_CFA, COMMA_CFA, HERE_CFA, LIT_CFA, 3, ADD_CFA, COMMA_CFA,
+ LIT_CFA, DOES_HELPER_CFA, COMMA_CFA, LIT_CFA, EXIT_CFA, COMMA_CFA, EXIT_CFA],
+ flags=F_IMMED)
+
+LBRAC_CFA = defPrimWord("[", () -> begin
+ mem[STATE] = 0
+ return NEXT
+end, flags=F_IMMED)
+
+RBRAC_CFA = defPrimWord("]", () -> begin
+ mem[STATE] = 1
+ return NEXT
+end, flags=F_IMMED)
+
+HIDDEN_CFA = defPrimWord("HIDDEN", () -> begin
+ lenAndFlagsAddr = mem[LATEST] + 1
+ mem[lenAndFlagsAddr] = mem[lenAndFlagsAddr] $ F_HIDDEN
+ return NEXT
end)
-STATE, STATE_CFA = defNewVar("STATE", 0)
+COLON_CFA = defWord(":",
+ [LIT_CFA, 32, WORD_CFA,
+ HEADER_CFA,
+ LIT_CFA, DOCOL, COMMA_CFA,
+ HIDDEN_CFA,
+ RBRAC_CFA,
+ EXIT_CFA])
+
+SEMICOLON_CFA = defWord(";",
+ [LIT_CFA, EXIT_CFA, COMMA_CFA,
+ HIDDEN_CFA,
+ LBRAC_CFA,
+ EXIT_CFA], flags=F_IMMED)
+
+IMMEDIATE_CFA = defPrimWord("IMMEDIATE", () -> begin
+ lenAndFlagsAddr = mem[LATEST] + 1
+ mem[lenAndFlagsAddr] = mem[lenAndFlagsAddr] $ F_IMMED
+ return NEXT
+end, flags=F_IMMED)
+
+# Outer Interpreter
+
+EXECUTE_CFA = defPrimWord("EXECUTE", () -> begin
+ reg.W = popPS()
+ return mem[reg.W]
+end)
-INTERPRET = defWord("INTERPRET",
- [LIT, 32, WORD, # Read next space-delimited word
+INTERPRET_CFA = defWord("INTERPRET",
+ [LIT_CFA, 32, WORD_CFA, # Read next space-delimited word
- DUP, FETCH, ZE, ZBRANCH, 3,
- DROP, EXIT, # Exit if TIB is exhausted
+ DUP_CFA, FETCH_CFA, ZE_CFA, ZBRANCH_CFA, 3,
+ DROP_CFA, EXIT_CFA, # Exit if TIB is exhausted
- STATE_CFA, FETCH, ZBRANCH, 31,
+ STATE_CFA, FETCH_CFA, ZBRANCH_CFA, 24,
# Compiling
- DUP, FIND, QDUP, ZBRANCH, 19,
+ FIND_CFA, QDUP_CFA, ZBRANCH_CFA, 13,
# Found word.
- SWAP, DROP,
- DUP, TOCFA, SWAP, INCR, FETCH, LIT, F_IMMED, AND, ZBRANCH, 4,
+ LIT_CFA, -1, EQ_CFA, INVERT_CFA, ZBRANCH_CFA, 4,
+
# Immediate: Execute!
- EXECUTE, BRANCH, -33,
+ EXECUTE_CFA, BRANCH_CFA, -26,
# Not immediate: Compile!
- COMMA, BRANCH, -36,
+ COMMA_CFA, BRANCH_CFA, -29,
# No word found, parse number
- NUMBER, BTICK, LIT, COMMA, COMMA, BRANCH, -43,
+ NUMBER_CFA, LIT_CFA, LIT_CFA, COMMA_CFA, COMMA_CFA, BRANCH_CFA, -36,
# Interpreting
- DUP, FIND, QDUP, ZBRANCH, 7,
+ FIND_CFA, QDUP_CFA, ZBRANCH_CFA, 5,
# Found word. Execute!
- SWAP, DROP, TOCFA, EXECUTE, BRANCH, -54,
+ DROP_CFA, EXECUTE_CFA, BRANCH_CFA, -44,
# No word found, parse number and leave on stack
- NUMBER, BRANCH, -57,
- EXIT]
-)
+ NUMBER_CFA, BRANCH_CFA, -47,
+ EXIT_CFA])
-PROMPT = defPrimWord("PROMPT", () -> begin
+PROMPT_CFA = defPrimWord("PROMPT", () -> begin
if (mem[STATE] == 0 && currentSource() == STDIN)
println(" ok")
end
return NEXT
end)
-QUIT = defWord("QUIT",
- [LIT, 0, STATE_CFA, STORE,
- LIT, 0, NUMTIB_CFA, STORE,
- RSP0_CFA, RSPSTORE,
- QUERY,
- INTERPRET, PROMPT,
- BRANCH,-4])
+QUIT_CFA = defWord("QUIT",
+ [LIT_CFA, 0, STATE_CFA, STORE_CFA,
+ LIT_CFA, 0, NUMTIB_CFA, STORE_CFA,
+ RSP0_CFA, RSPSTORE_CFA,
+ QUERY_CFA,
+ INTERPRET_CFA, PROMPT_CFA,
+ BRANCH_CFA,-4])
+
+ABORT_CFA = defWord("ABORT",
+ [PSP0_CFA, PSPSTORE_CFA, QUIT_CFA])
+
+BYE_CFA = defPrimWord("BYE", () -> begin
+ println("\nBye!")
+ return 0
+end)
-ABORT = defWord("ABORT",
- [PSP0_CFA, PSPSTORE, QUIT])
+# File I/O
-INCLUDE = defPrimWord("INCLUDE", () -> begin
+INCLUDE_CFA = defPrimWord("INCLUDE", () -> begin
pushPS(32)
- callPrim(mem[WORD])
+ callPrim(mem[WORD_CFA])
wordAddr = popPS()+1
wordLen = mem[wordAddr-1]
word = getString(wordAddr, wordLen)
return NEXT
end)
-# Compilation
-
-HEADER = defPrimWord("HEADER", () -> begin
- wordAddr = popPS()+1
- wordLen = mem[wordAddr-1]
- word = getString(wordAddr, wordLen)
-
- createHeader(word, 0)
-
- return NEXT
-end)
-
-LBRAC = defPrimWord("[", () -> begin
- mem[STATE] = 0
- return NEXT
-end, flags=F_IMMED)
-
-RBRAC = defPrimWord("]", () -> begin
- mem[STATE] = 1
- return NEXT
-end, flags=F_IMMED)
-
-HIDDEN = defPrimWord("HIDDEN", () -> begin
- addr = popPS() + 1
- mem[addr] = mem[addr] $ F_HIDDEN
- return NEXT
-end)
-
-HIDE = defWord("HIDE",
- [LIT, 32, WORD,
- FIND,
- HIDDEN,
- EXIT])
-
-COLON = defWord(":",
- [LIT, 32, WORD,
- HEADER,
- LIT, DOCOL, COMMA,
- LATEST_CFA, FETCH, HIDDEN,
- RBRAC,
- EXIT])
-
-SEMICOLON = defWord(";",
- [LIT, EXIT, COMMA,
- LATEST_CFA, FETCH, HIDDEN,
- LBRAC,
- EXIT], flags=F_IMMED)
-
-IMMEDIATE = defPrimWord("IMMEDIATE", () -> begin
- lenAndFlagsAddr = mem[LATEST] + 1
- mem[lenAndFlagsAddr] = mem[lenAndFlagsAddr] $ F_IMMED
- return NEXT
-end, flags=F_IMMED)
-
#### VM loop ####
end
# Start with IP pointing to first instruction of outer interpreter
- reg.IP = QUIT + 1
+ reg.IP = QUIT_CFA + 1
# Primitive processing loop.
# Everyting else is simply a consequence of this loop!
end
# QUIT
- reg.IP = ABORT + 1
+ reg.IP = ABORT_CFA + 1
jmp = NEXT
end
end
# Debugging tools
+TRACE_CFA = defPrimWord("TRACE", () -> begin
+ println("reg.W: $(reg.W) reg.IP: $(reg.IP)")
+ print("PS: "); printPS()
+ print("RS: "); printRS()
+ print("[paused]")
+ readline()
+
+ return NEXT
+end)
+
function dump(startAddr::Int64; count::Int64 = 100, cellsPerLine::Int64 = 10)
chars = Array{Char,1}(cellsPerLine)
count = popPS()
addr = popPS()
+ println()
dump(addr, count=count)
return NEXT
The Lambda Lab / projects / forth.jl.git / blobdiff