return val
end
+# Handy functions for adding/retrieving strings to/from memory.
+
+getString(addr::Int64, len::Int64) = ASCIIString([Char(c) for c in mem[addr:(addr+len-1)]])
+function putString(str::ASCIIString, addr::Int64)
+ mem[addr:(addr+length(str)-1)] = [Int64(c) for c in str]
+end
+
# Primitive creation and calling functions
function createHeader(name::AbstractString, flags::Int64)
mem[HERE] += 1
mem[mem[HERE]] = length(name) | flags; mem[HERE] += 1
- mem[mem[HERE]:(mem[HERE]+length(name)-1)] = [Int(c) for c in name]; mem[HERE] += length(name)
+ putString(name, mem[HERE]); mem[HERE] += length(name)
end
function defPrim(name::AbstractString, f::Function; flags::Int64=0)
function defNewVar(name::AbstractString, initial::Int64; flags::Int64=0)
createHeader(name, flags)
+ codeWordAddr = mem[HERE]
varAddr = mem[HERE] + 1
push!(primitives, eval(:(() -> begin
pushPS($(varAddr))
mem[mem[HERE]] = initial; mem[HERE] += 1
- return varAddr
+ return varAddr, codeWordAddr
end
function defConst(name::AbstractString, val::Int64; flags::Int64=0)
# Built-in variables
-defExistingVar("HERE", HERE)
-defExistingVar("LATEST", LATEST)
-defExistingVar("PSP0", PSP0)
-defExistingVar("RSP0", RSP0)
-STATE = defNewVar("STATE", 0)
-BASE = defNewVar("BASE", 10)
+HERE_CFA = defExistingVar("HERE", HERE)
+LATEST_CFA = defExistingVar("LATEST", LATEST)
+PSP0_CFA = defExistingVar("PSP0", PSP0)
+RSP0_CFA = defExistingVar("RSP0", RSP0)
+STATE, STATE_CFA = defNewVar("STATE", 0)
+BASE, BASE_CFA = defNewVar("BASE", 10)
# Constants
# I/O
defConst("TIB", TIB)
-NUMTIB = defNewVar("#TIB", 0)
-TOIN = defNewVar(">IN", 0)
+NUMTIB, NUMTIB_CFA = defNewVar("#TIB", 0)
+TOIN, TOIN_CFA = defNewVar(">IN", 0)
KEY = defPrim("KEY", () -> begin
if mem[TOIN] >= mem[NUMTIB]
mem[TOIN] = 0
line = readline()
mem[NUMTIB] = length(line)
- mem[TIB:(TIB+mem[NUMTIB]-1)] = [Int64(c) for c in collect(line)]
+ putString(line, TIB)
end
pushPS(mem[TIB + mem[TOIN]])
wordLen = popPS()
wordAddr = popPS()
- s = ASCIIString([Char(c) for c in mem[wordAddr:(wordAddr+wordLen-1)]])
+ s = getString(wordAddr, wordLen)
try
pushPS(parse(Int64, s, mem[BASE]))
wordLen = popPS()
wordAddr = popPS()
- word = ASCIIString([Char(c) for c in mem[wordAddr:(wordAddr+wordLen-1)]])
+ word = getString(wordAddr, wordLen)
- latest = mem[LATEST]
+ latest = LATEST
- while latest>0
+ i = 0
+ while (latest = mem[latest]) > 0
lenAndFlags = mem[latest+1]
len = lenAndFlags & F_LENMASK
hidden = (lenAndFlags & F_HIDDEN) == F_HIDDEN
if hidden || len != wordLen
- latest = mem[latest]
continue
end
thisAddr = latest+2
- thisWord = ASCIIString([Char(c) for c in mem[thisAddr:(thisAddr+len-1)]])
+ thisWord = getString(thisAddr, len)
if thisWord == word
break
TODFA = defWord(">DFA", [TOCFA, INCR, EXIT])
+# Compilation
+
+CREATE = defPrim("CREATE", () -> begin
+
+ wordLen = popPS()
+ wordAddr = popPS()
+ word = getString(wordAddr, wordLen)
+
+ createHeader(word, 0)
+
+ return mem[NEXT]
+end)
+
+COMMA = defPrim(",", () -> begin
+ mem[mem[HERE]] = popPS()
+ mem[HERE] += 1
+
+ return mem[NEXT]
+end)
+
+LBRAC = defPrim("[", () -> begin
+ mem[STATE] = 0
+ return mem[NEXT]
+end, flags=F_IMMED)
+
+RBRAC = defPrim("]", () -> begin
+ mem[STATE] = 1
+ return mem[NEXT]
+end, flags=F_IMMED)
+
+HIDDEN = defPrim("HIDDEN", () -> begin
+ addr = popPS() + 1
+ mem[addr] = mem[addr] $ F_HIDDEN
+ return mem[NEXT]
+end)
+
+HIDE = defWord("HIDE",
+ [WORD,
+ FIND,
+ HIDDEN,
+ EXIT])
+
+COLON = defWord(":",
+ [WORD,
+ CREATE,
+ LIT, DOCOL, COMMA,
+ LATEST, FETCH, HIDDEN,
+ RBRAC,
+ EXIT])
+
+SEMICOLON = defWord(";",
+ [LIT, EXIT, COMMA,
+ LATEST, FETCH, HIDDEN,
+ LBRAC,
+ EXIT], flags=F_IMMED)
+
+IMMEDIATE = defPrim("IMMEDIATE", () -> begin
+ lenAndFlagsAddr = mem[LATEST] + 1
+ mem[lenAndFlagsAddr] = mem[lenAndFlagsAddr] $ F_IMMED
+ return mem[NEXT]
+end, flags=F_IMMED)
+
+TICK = defWord("'", [WORD, FIND, TOCFA, EXIT])
+
+# Branching
+
+BRANCH = defPrim("BRANCH", () -> begin
+ reg.IP += mem[reg.IP]
+ return mem[NEXT]
+end)
+
+ZBRANCH = defPrim("0BRANCH", () -> begin
+ if (popPS() == 0)
+ reg.IP += mem[reg.IP]
+ else
+ reg.IP += 1
+ end
+
+ return mem[NEXT]
+end)
+
+# Strings
+
+LITSTRING = defPrim("LITSTRING", () -> begin
+ len = mem[reg.IP]
+ reg.IP += 1
+ pushPS(reg.IP)
+ pushPS(len)
+ reg.IP += len
+
+ return mem[NEXT]
+end)
+
+TELL = defPrim("TELL", () -> begin
+ len = popPS()
+ addr = popPS()
+ str = getString(addr, len)
+ print(str)
+ return mem[NEXT]
+end)
+
+# Outer interpreter
+
+INTERPRET = defPrim("INTERPRET", () -> begin
+
+ callPrim(mem[WORD])
+ callPrim(mem[TWODUP])
+ callPrim(mem[FIND])
+
+ wordAddr = mem[reg.PSP]
+
+ if wordAddr>0
+ # Word in dictionary
+
+ isImmediate = (mem[wordAddr+1] & F_IMMED) != 0
+ callPrim(mem[TOCFA])
+
+ callPrim(mem[ROT]) # get rid of extra copy of word string details
+ popPS()
+ popPS()
+
+ if mem[STATE] == 0 || isImmediate
+ # Execute!
+ return mem[popPS()]
+ else
+ # Append CFA to dictionary
+ callPrim(mem[COMMA])
+ end
+ else
+ # Not in dictionary, assume number
+
+ popPS()
+ callPrim(mem[NUMBER])
+
+ if popPS() != 0
+ println("Parse error!")
+ return mem[NEXT]
+ end
+
+ if mem[STATE] == 0
+ # Number already on stack!
+ else
+ # Append literal to dictionary
+ pushPS(LIT)
+ callPrim(mem[COMMA])
+ callPrim(mem[COMMA])
+ end
+ end
+
+ return mem[NEXT]
+end)
+
+QUIT = defWord("QUIT",
+ [RSP0_CFA, RSPSTORE,
+ INTERPRET,
+ BRANCH,-2])
+
+# Odds and Ends
+
+CHAR = defPrim("CHAR", () -> begin
+ callPrim(mem[WORD])
+ wordLen = popPS()
+ wordAddr = popPS()
+ word = getString(wordAddr, wordLen)
+ pushPS(Int64(word[1]))
+
+ return mem[NEXT]
+end)
+
+EXECUTE = defPrim("EXECUTE", () -> begin
+ return mem[popPS()]
+end)
+
#### VM loop ####
function runVM()
- jmp = NEXT
+ # Start with IP pointing to first instruction of outer interpreter
+ reg.IP = QUIT + 1
+
+ # Primitive processing loop.
+ # Everyting else is simply a consequence of this loop!
+ jmp = mem[NEXT]
while (jmp = callPrim(jmp)) != 0 end
end
function dump(startAddr::Int64; count::Int64 = 100, cellsPerLine::Int64 = 10)
chars = Array{Char,1}(cellsPerLine)
- for i in 0:(count-1)
- addr = startAddr + i
- if i%cellsPerLine == 0
- print("$addr:")
- end
-
- print("\t$(mem[addr]) ")
+ lineStartAddr = cellsPerLine*div((startAddr-1),cellsPerLine) + 1
+ endAddr = startAddr + count - 1
+
+ q, r = divrem((endAddr-lineStartAddr+1), cellsPerLine)
+ numLines = q + (r > 0 ? 1 : 0)
+
+ i = lineStartAddr
+ for l in 1:numLines
+ print(i,":")
+
+ for c in 1:cellsPerLine
+ if i >= startAddr && i <= endAddr
+ print("\t",mem[i])
+ if mem[i]>=32 && mem[i]<128
+ chars[c] = Char(mem[i])
+ else
+ chars[c] = '.'
+ end
+ else
+ print("\t")
+ chars[c] = ' '
+ end
- if (mem[addr]>=32 && mem[addr]<176)
- chars[i%cellsPerLine + 1] = Char(mem[addr])
- else
- chars[i%cellsPerLine + 1] = '.'
+ i += 1
end
- if i%cellsPerLine == cellsPerLine-1
- println(string("\t", ASCIIString(chars)))
- end
+ println("\t", ASCIIString(chars))
end
end
The Lambda Lab / projects / forth.jl.git / blobdiff