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inst.js
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inst.js
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// Instruction set of p-machine. This machine language is compatible with the
// p-code of 1978 UCSD Pascal.
//
// References:
// http://cs2.uco.edu/~trt/cs4173/pspec.pdf
// http://cs2.uco.edu/~trt/cs4933/P-MachineSimulator.pdf
define(["PascalError"], function (PascalError) {
var OPCODE_BITS = 8;
var OPERAND1_BITS = 9;
var OPERAND2_BITS = 15;
var OPCODE_MASK = (1 << OPCODE_BITS) - 1;
var OPERAND1_MASK = (1 << OPERAND1_BITS) - 1;
var OPERAND2_MASK = (1 << OPERAND2_BITS) - 1;
var OPCODE_SHIFT = 0;
var OPERAND1_SHIFT = OPCODE_SHIFT + OPCODE_BITS;
var OPERAND2_SHIFT = OPERAND1_SHIFT + OPERAND1_BITS;
var defs = {
// Op codes. Description operand1 operand2
// Subprogram linkage.
CUP: 0x00, // Call user procedure argsize iaddr
CSP: 0x01, // Call standard procedure argsize stdfunction
ENT: 0x02, // Entry register amount
MST: 0x03, // Mark stack level
RTN: 0x04, // Return type
// Comparison.
EQU: 0x05, // Equality type
NEQ: 0x06, // Inequality type
GRT: 0x07, // Greater than type
GEQ: 0x08, // Greater than or equal type
LES: 0x09, // Less than type
LEQ: 0x0A, // Less than or equal type
// Integer arithmetic.
ADI: 0x0B, // Integer addition
SBI: 0x0C, // Integer subtraction
NGI: 0x0D, // Integer sign inversion
MPI: 0x0E, // Integer multiplication
DVI: 0x0F, // Integer division
MOD: 0x10, // Integer modulo
ABI: 0x11, // Integer absolute value
SQI: 0x12, // Integer square
INC: 0x13, // Integer increment i-type
DEC: 0x14, // Integer decrement i-type
// Real arithmetic.
ADR: 0x15, // Real addition
SBR: 0x16, // Real subtraction
NGR: 0x17, // Real sign inversion
MPR: 0x18, // Real multiplication
DVR: 0x19, // Real division
ABR: 0x1A, // Real absolute value
SQR: 0x1B, // Real square
// Boolean.
IOR: 0x1C, // Inclusive OR.
AND: 0x1D, // AND
XOR: 0x1E, // Exclusive OR.
NOT: 0x1F, // NOT.
// Set operations.
INN: 0x20, // Set membership.
UNI: 0x21, // Set union.
INT: 0x22, // Set intersection.
DIF: 0x23, // Set difference.
CMP: 0x24, // Set complement.
SGS: 0x25, // Generate singleton set.
// Jump.
UJP: 0x26, // Unconditional jump. iaddr
XJP: 0x27, // Indexed jump. iaddr
FJP: 0x28, // False jump. iaddr
TJP: 0x29, // True jump. iaddr
// Conversion.
FLT: 0x2A, // Integer to real.
FLO: 0x2B, // Integer to real (2nd entry on stack).
TRC: 0x2C, // Truncate.
RND: 0x2C, // Round.
CHR: 0x2C, // Integer to char.
ORD: 0x2C, // Anything to integer.
// Termination.
STP: 0x30, // Stop.
// Data reference.
LDA: 0x31, // Load address of data level offset
LDC: 0x32, // Load constant type cindex
LDI: 0x33, // Load indirect type
LVA: 0x34, // Load value (address) level offset
LVB: 0x35, // Load value (boolean) level offset
LVC: 0x36, // Load value (character) level offset
LVI: 0x37, // Load value (integer) level offset
LVR: 0x38, // Load value (real) level offset
LVS: 0x39, // Load value (set) level offset
STI: 0x3A, // Store indirect type
IXA: 0x3B, // Compute indexed address stride
// Registers.
REG_SP: 0x00, // Stack pointer.
REG_EP: 0x01, // Extreme pointer (not used in this machine).
REG_MP: 0x02, // Mark pointer.
REG_PC: 0x03, // Program counter.
REG_NP: 0x04, // New pointer.
// Types.
A: 0x00, // Address.
B: 0x01, // Boolean.
C: 0x02, // Character.
I: 0x03, // Integer.
R: 0x04, // Real.
S: 0x05, // String.
T: 0x06, // Set.
P: 0x07, // Procedure (aka void, returned by procedure).
X: 0x08, // Any.
// The Mark is the area at the bottom of each frame. It contains (low to high address):
//
// Return value (rv).
// Static link (sl).
// Dynamic link (dl).
// Extreme pointer (es), not used.
// Return address (ra).
//
MARK_SIZE: 5,
// Opcode number (such as 0x32) to name ("LDC").
opcodeToName: {
// Populated procedurally below.
},
// Construct a machine language instruction.
make: function (opcode, operand1, operand2) {
// Allow caller to leave out these operands.
operand1 = operand1 || 0;
operand2 = operand2 || 0;
// Sanity check.
if (operand1 < 0) {
throw new PascalError(null, "negative operand1: " + operand1);
}
if (operand1 > OPERAND1_MASK) {
throw new PascalError(null, "too large operand1: " + operand1);
}
if (operand2 < 0) {
throw new PascalError(null, "negative operand2: " + operand2);
}
if (operand2 > OPERAND2_MASK) {
throw new PascalError(null, "too large operand2: " + operand2);
}
return (opcode << OPCODE_SHIFT) |
(operand1 << OPERAND1_SHIFT) |
(operand2 << OPERAND2_SHIFT);
},
// Return the opcode of the instruction.
getOpcode: function (i) {
return (i >>> OPCODE_SHIFT) & OPCODE_MASK;
},
// Return operand 1 of the instruction.
getOperand1: function (i) {
return (i >>> OPERAND1_SHIFT) & OPERAND1_MASK;
},
// Return operand 2 of the instruction.
getOperand2: function (i) {
return (i >>> OPERAND2_SHIFT) & OPERAND2_MASK;
},
// Return a string version of the instruction.
disassemble: function (i) {
var opcode = this.getOpcode(i);
var operand1 = this.getOperand1(i);
var operand2 = this.getOperand2(i);
return this.opcodeToName[opcode] + " " + operand1 + " " + operand2;
},
// Converts a type code like inst.I to "integer", or throw if not valid.
typeCodeToName: function (typeCode) {
switch (typeCode) {
case this.A:
return "pointer";
case this.B:
return "boolean";
case this.C:
return "char";
case this.I:
return "integer";
case this.R:
return "real";
case this.S:
return "string";
default:
throw new PascalError(null, "unknown type code " + typeCode);
}
}
};
// Make an inverse table of opcodes.
defs.opcodeToName[defs.CUP] = "CUP";
defs.opcodeToName[defs.CSP] = "CSP";
defs.opcodeToName[defs.ENT] = "ENT";
defs.opcodeToName[defs.MST] = "MST";
defs.opcodeToName[defs.RTN] = "RTN";
defs.opcodeToName[defs.EQU] = "EQU";
defs.opcodeToName[defs.NEQ] = "NEQ";
defs.opcodeToName[defs.GRT] = "GRT";
defs.opcodeToName[defs.GEQ] = "GEQ";
defs.opcodeToName[defs.LES] = "LES";
defs.opcodeToName[defs.LEQ] = "LEQ";
defs.opcodeToName[defs.ADI] = "ADI";
defs.opcodeToName[defs.SBI] = "SBI";
defs.opcodeToName[defs.NGI] = "NGI";
defs.opcodeToName[defs.MPI] = "MPI";
defs.opcodeToName[defs.DVI] = "DVI";
defs.opcodeToName[defs.MOD] = "MOD";
defs.opcodeToName[defs.ABI] = "ABI";
defs.opcodeToName[defs.SQI] = "SQI";
defs.opcodeToName[defs.INC] = "INC";
defs.opcodeToName[defs.DEC] = "DEC";
defs.opcodeToName[defs.ADR] = "ADR";
defs.opcodeToName[defs.SBR] = "SBR";
defs.opcodeToName[defs.NGR] = "NGR";
defs.opcodeToName[defs.MPR] = "MPR";
defs.opcodeToName[defs.DVR] = "DVR";
defs.opcodeToName[defs.ABR] = "ABR";
defs.opcodeToName[defs.SQR] = "SQR";
defs.opcodeToName[defs.IOR] = "IOR";
defs.opcodeToName[defs.AND] = "AND";
defs.opcodeToName[defs.XOR] = "XOR";
defs.opcodeToName[defs.NOT] = "NOT";
defs.opcodeToName[defs.INN] = "INN";
defs.opcodeToName[defs.UNI] = "UNI";
defs.opcodeToName[defs.INT] = "INT";
defs.opcodeToName[defs.DIF] = "DIF";
defs.opcodeToName[defs.CMP] = "CMP";
defs.opcodeToName[defs.SGS] = "SGS";
defs.opcodeToName[defs.UJP] = "UJP";
defs.opcodeToName[defs.XJP] = "XJP";
defs.opcodeToName[defs.FJP] = "FJP";
defs.opcodeToName[defs.TJP] = "TJP";
defs.opcodeToName[defs.FLT] = "FLT";
defs.opcodeToName[defs.FLO] = "FLO";
defs.opcodeToName[defs.TRC] = "TRC";
defs.opcodeToName[defs.RND] = "RND";
defs.opcodeToName[defs.CHR] = "CHR";
defs.opcodeToName[defs.ORD] = "ORD";
defs.opcodeToName[defs.STP] = "STP";
defs.opcodeToName[defs.LDA] = "LDA";
defs.opcodeToName[defs.LDC] = "LDC";
defs.opcodeToName[defs.LDI] = "LDI";
defs.opcodeToName[defs.LVA] = "LVA";
defs.opcodeToName[defs.LVB] = "LVB";
defs.opcodeToName[defs.LVC] = "LVC";
defs.opcodeToName[defs.LVI] = "LVI";
defs.opcodeToName[defs.LVR] = "LVR";
defs.opcodeToName[defs.LVS] = "LVS";
defs.opcodeToName[defs.STI] = "STI";
defs.opcodeToName[defs.IXA] = "IXA";
return defs;
});