# Built-in variables
nextVarAddr = 1
-H = nextVarAddr; nextVarAddr += 1
-LATEST = nextVarAddr; nextVarAddr += 1
+H = nextVarAddr; nextVarAddr += 1 # Next free memory address
+LATEST = nextVarAddr; nextVarAddr += 1 # LFA of latest word in systetm dict
RSP0 = nextVarAddr # bottom of RS
PSP0 = RSP0 + size_RS # bottom of PS
TIB = PSP0 + size_PS # address of terminal input buffer
-mem[H] = 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[H] # Save bottom of dictionary as constant
end)))
end
-function defNewVar(name::AbstractString, initial::Int64; flags::Int64=0)
+function defNewVar(name::AbstractString, initial::Array{Int64,1}; flags::Int64=0)
createHeader(name, flags)
codeWordAddr = mem[H]
varAddr = mem[H] + 1
mem[mem[H]] = DOVAR; mem[H] += 1
- mem[mem[H]] = initial; mem[H] += 1
+ mem[mem[H]:(mem[H]+length(initial)-1)] = initial; mem[H] += length(initial)
return varAddr, codeWordAddr
end
+defNewVar(name::AbstractString, initial::Int64; flags::Int64=0) =
+ defNewVar(name, [initial]; flags=flags)
+
function defConst(name::AbstractString, val::Int64; flags::Int64=0)
createHeader(name, flags)
return NEXT
end)
-# Outer interpreter
-
-COMMA_CFA = defPrimWord(",", () -> begin
- mem[mem[H]] = popPS()
- mem[H] += 1
-
- return NEXT
-end)
-
-BTICK_CFA = defWord("[']",
- [FROMR_CFA, DUP_CFA, INCR_CFA, TOR_CFA, FETCH_CFA, EXIT_CFA])
-
-EXECUTE_CFA = 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)
return NEXT
end)
-PARSE_CFA = defPrimWord("PARSE", () -> begin
- delim = popPS()
-
- # Chew up initial occurrences of delim
- addr = mem[H]
-
- # Start reading input stream
- count = 0
- while (mem[TOIN]<mem[NUMTIB])
- mem[addr] = mem[TIB+mem[TOIN]]
- mem[TOIN] += 1
-
- if (mem[addr] == delim)
- break
- end
-
- count += 1
- addr += 1
- end
-
- pushPS(addr)
- pushPS(count)
-
- return NEXT
-end)
-
-BYE_CFA = defPrimWord("BYE", () -> begin
- println("\nBye!")
- return 0
-end)
+# Compilation
STATE, STATE_CFA = defNewVar("STATE", 0)
-INTERPRET_CFA = defWord("INTERPRET",
- [LIT_CFA, 32, WORD_CFA, # Read next space-delimited word
-
- DUP_CFA, FETCH_CFA, ZE_CFA, ZBRANCH_CFA, 3,
- DROP_CFA, EXIT_CFA, # Exit if TIB is exhausted
-
- STATE_CFA, FETCH_CFA, ZBRANCH_CFA, 24,
- # Compiling
- FIND_CFA, QDUP_CFA, ZBRANCH_CFA, 13,
-
- # Found word.
- LIT_CFA, -1, EQ_CFA, INVERT_CFA, ZBRANCH_CFA, 4,
-
- # Immediate: Execute!
- EXECUTE_CFA, BRANCH_CFA, -26,
-
- # Not immediate: Compile!
- COMMA_CFA, BRANCH_CFA, -29,
-
- # No word found, parse number
- NUMBER_CFA, BTICK_CFA, LIT_CFA, COMMA_CFA, COMMA_CFA, BRANCH_CFA, -36,
-
- # Interpreting
- FIND_CFA, QDUP_CFA, ZBRANCH_CFA, 5,
-
- # Found word. Execute!
- DROP_CFA, EXECUTE_CFA, BRANCH_CFA, -44,
-
- # No word found, parse number and leave on stack
- NUMBER_CFA, BRANCH_CFA, -47,
- EXIT_CFA])
-
-PROMPT_CFA = defPrimWord("PROMPT", () -> begin
- if (mem[STATE] == 0 && currentSource() == STDIN)
- println(" ok")
- end
-
- return NEXT
-end)
-
-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])
-
-INCLUDE_CFA = defPrimWord("INCLUDE", () -> begin
- pushPS(32)
- callPrim(mem[WORD_CFA])
- wordAddr = popPS()+1
- wordLen = mem[wordAddr-1]
- word = getString(wordAddr, wordLen)
-
- push!(sources, open(word, "r"))
-
- # Clear input buffer
- mem[NUMTIB] = 0
+COMMA_CFA = defPrimWord(",", () -> begin
+ mem[mem[H]] = popPS()
+ mem[H] += 1
return NEXT
end)
-# Compilation
-
HERE_CFA = defWord("HERE",
[H_CFA, FETCH_CFA, EXIT_CFA])
end, flags=F_IMMED)
DOES_CFA = defWord("DOES>",
- [BTICK_CFA, LIT_CFA, COMMA_CFA, HERE_CFA, LIT_CFA, 3, ADD_CFA, COMMA_CFA,
- BTICK_CFA, DOES_HELPER_CFA, COMMA_CFA, BTICK_CFA, EXIT_CFA, COMMA_CFA, EXIT_CFA],
+ [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
return NEXT
end, flags=F_IMMED)
+# Outer Interpreter
+
+EXECUTE_CFA = defPrimWord("EXECUTE", () -> begin
+ reg.W = popPS()
+ return mem[reg.W]
+end)
+
+INTERPRET_CFA = defWord("INTERPRET",
+ [LIT_CFA, 32, WORD_CFA, # Read next space-delimited word
+
+ DUP_CFA, FETCH_CFA, ZE_CFA, ZBRANCH_CFA, 3,
+ DROP_CFA, EXIT_CFA, # Exit if TIB is exhausted
+
+ STATE_CFA, FETCH_CFA, ZBRANCH_CFA, 24,
+ # Compiling
+ FIND_CFA, QDUP_CFA, ZBRANCH_CFA, 13,
+
+ # Found word.
+ LIT_CFA, -1, EQ_CFA, INVERT_CFA, ZBRANCH_CFA, 4,
+
+ # Immediate: Execute!
+ EXECUTE_CFA, BRANCH_CFA, -26,
+
+ # Not immediate: Compile!
+ COMMA_CFA, BRANCH_CFA, -29,
+
+ # No word found, parse number
+ NUMBER_CFA, LIT_CFA, LIT_CFA, COMMA_CFA, COMMA_CFA, BRANCH_CFA, -36,
+
+ # Interpreting
+ FIND_CFA, QDUP_CFA, ZBRANCH_CFA, 5,
+
+ # Found word. Execute!
+ DROP_CFA, EXECUTE_CFA, BRANCH_CFA, -44,
+
+ # No word found, parse number and leave on stack
+ NUMBER_CFA, BRANCH_CFA, -47,
+ EXIT_CFA])
+
+PROMPT_CFA = defPrimWord("PROMPT", () -> begin
+ if (mem[STATE] == 0 && currentSource() == STDIN)
+ println(" ok")
+ end
+
+ return NEXT
+end)
+
+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)
+
+# File I/O
+
+INCLUDE_CFA = defPrimWord("INCLUDE", () -> begin
+ pushPS(32)
+ callPrim(mem[WORD_CFA])
+ wordAddr = popPS()+1
+ wordLen = mem[wordAddr-1]
+ word = getString(wordAddr, wordLen)
+
+ fname = word
+ if !isfile(fname)
+ fname = Pkg.dir("forth","src",word)
+ if !isfile(fname)
+ error("No file named $word found in current directory or package source directory.")
+ end
+ end
+ push!(sources, open(fname, "r"))
+
+ # Clear input buffer
+ mem[NUMTIB] = 0
+
+ return NEXT
+end)
+
#### VM loop ####
initFileName = nothing
if isfile("lib.4th")
initFileName = "lib.4th"
-elseif isfile(Pkg.dir("forth/src/lib.4th"))
- initFileName = Pkg.dir("forth/src/lib.4th")
+elseif isfile(Pkg.dir("forth","src", "lib.4th"))
+ initFileName = Pkg.dir("forth","src","lib.4th")
end
function run(;initialize=true)
The Lambda Lab / projects / forth.jl.git / blobdiff