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518 lines
18 KiB
518 lines
18 KiB
#include <stdio.h>
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#include <iostream>
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#include <vector>
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#include <map>
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#include "util.h"
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#include "bignum.h"
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#include "opcodes.h"
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struct programAux {
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std::map<std::string, std::string> vars;
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bool allocUsed;
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bool calldataUsed;
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int step;
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int labelLength;
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};
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struct programData {
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programAux aux;
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Node code;
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int outs;
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};
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programAux Aux() {
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programAux o;
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o.allocUsed = false;
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o.calldataUsed = false;
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o.step = 0;
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return o;
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}
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programData pd(programAux aux = Aux(), Node code=token("_"), int outs=0) {
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programData o;
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o.aux = aux;
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o.code = code;
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o.outs = outs;
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return o;
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}
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Node multiToken(Node nodes[], int len, Metadata met) {
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std::vector<Node> out;
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for (int i = 0; i < len; i++) {
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out.push_back(nodes[i]);
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}
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return astnode("_", out, met);
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}
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Node finalize(programData c);
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Node popwrap(Node node) {
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Node nodelist[] = {
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node,
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token("POP", node.metadata)
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};
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return multiToken(nodelist, 2, node.metadata);
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}
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// Turns LLL tree into tree of code fragments
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programData opcodeify(Node node,
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programAux aux=Aux(),
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int height=0,
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std::map<std::string, int> dupvars=
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std::map<std::string, int>()) {
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std::string symb = "_"+mkUniqueToken();
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Metadata m = node.metadata;
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// Numbers
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if (node.type == TOKEN) {
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return pd(aux, nodeToNumeric(node), 1);
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}
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else if (node.val == "ref" || node.val == "get" || node.val == "set") {
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std::string varname = node.args[0].val;
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if (!aux.vars.count(varname)) {
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aux.vars[varname] = unsignedToDecimal(aux.vars.size() * 32);
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}
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if (varname == "'msg.data") aux.calldataUsed = true;
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// Set variable
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if (node.val == "set") {
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programData sub = opcodeify(node.args[1], aux, height, dupvars);
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if (!sub.outs)
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err("Value to set variable must have nonzero arity!", m);
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if (dupvars.count(node.args[0].val)) {
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int h = height - dupvars[node.args[0].val];
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if (h > 16) err("Too deep for stack variable (max 16)", m);
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Node nodelist[] = {
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sub.code,
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token("SWAP"+unsignedToDecimal(h), m),
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token("POP", m)
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};
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return pd(sub.aux, multiToken(nodelist, 3, m), 0);
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}
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Node nodelist[] = {
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sub.code,
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token(sub.aux.vars[varname], m),
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token("MSTORE", m),
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};
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return pd(sub.aux, multiToken(nodelist, 3, m), 0);
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}
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// Get variable
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else if (node.val == "get") {
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if (dupvars.count(node.args[0].val)) {
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int h = height - dupvars[node.args[0].val];
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if (h > 16) err("Too deep for stack variable (max 16)", m);
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return pd(aux, token("DUP"+unsignedToDecimal(h)), 1);
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}
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Node nodelist[] =
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{ token(aux.vars[varname], m), token("MLOAD", m) };
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return pd(aux, multiToken(nodelist, 2, m), 1);
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}
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// Refer variable
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else {
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if (dupvars.count(node.args[0].val))
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err("Cannot ref stack variable!", m);
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return pd(aux, token(aux.vars[varname], m), 1);
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}
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}
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// Code blocks
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if (node.val == "lll" && node.args.size() == 2) {
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if (node.args[1].val != "0") aux.allocUsed = true;
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std::vector<Node> o;
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o.push_back(finalize(opcodeify(node.args[0])));
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programData sub = opcodeify(node.args[1], aux, height, dupvars);
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Node code = astnode("____CODE", o, m);
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Node nodelist[] = {
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token("$begincode"+symb+".endcode"+symb, m), token("DUP1", m),
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token("$begincode"+symb, m), sub.code, token("CODECOPY", m),
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token("$endcode"+symb, m), token("JUMP", m),
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token("~begincode"+symb, m), code, token("~endcode"+symb, m),
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token("JUMPDEST", m)
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};
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return pd(sub.aux, multiToken(nodelist, 11, m), 1);
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}
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// Stack variables
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if (node.val == "with") {
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std::map<std::string, int> dupvars2 = dupvars;
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dupvars2[node.args[0].val] = height;
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programData initial = opcodeify(node.args[1], aux, height, dupvars);
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if (!initial.outs)
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err("Initial variable value must have nonzero arity!", m);
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programData sub = opcodeify(node.args[2], initial.aux, height + 1, dupvars2);
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Node nodelist[] = {
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initial.code,
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sub.code
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};
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programData o = pd(sub.aux, multiToken(nodelist, 2, m), sub.outs);
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if (sub.outs)
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o.code.args.push_back(token("SWAP1", m));
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o.code.args.push_back(token("POP", m));
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return o;
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}
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// Seq of multiple statements
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if (node.val == "seq") {
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std::vector<Node> children;
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int lastOut = 0;
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for (unsigned i = 0; i < node.args.size(); i++) {
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programData sub = opcodeify(node.args[i], aux, height, dupvars);
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aux = sub.aux;
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if (sub.outs == 1) {
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if (i < node.args.size() - 1) sub.code = popwrap(sub.code);
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else lastOut = 1;
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}
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children.push_back(sub.code);
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}
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return pd(aux, astnode("_", children, m), lastOut);
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}
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// 2-part conditional (if gets rewritten to unless in rewrites)
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else if (node.val == "unless" && node.args.size() == 2) {
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programData cond = opcodeify(node.args[0], aux, height, dupvars);
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programData action = opcodeify(node.args[1], cond.aux, height, dupvars);
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aux = action.aux;
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if (!cond.outs) err("Condition of if/unless statement has arity 0", m);
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if (action.outs) action.code = popwrap(action.code);
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Node nodelist[] = {
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cond.code,
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token("$endif"+symb, m), token("JUMPI", m),
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action.code,
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token("~endif"+symb, m), token("JUMPDEST", m)
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};
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return pd(aux, multiToken(nodelist, 6, m), 0);
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}
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// 3-part conditional
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else if (node.val == "if" && node.args.size() == 3) {
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programData ifd = opcodeify(node.args[0], aux, height, dupvars);
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programData thend = opcodeify(node.args[1], ifd.aux, height, dupvars);
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programData elsed = opcodeify(node.args[2], thend.aux, height, dupvars);
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aux = elsed.aux;
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if (!ifd.outs)
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err("Condition of if/unless statement has arity 0", m);
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// Handle cases where one conditional outputs something
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// and the other does not
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int outs = (thend.outs && elsed.outs) ? 1 : 0;
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if (thend.outs > outs) thend.code = popwrap(thend.code);
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if (elsed.outs > outs) elsed.code = popwrap(elsed.code);
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Node nodelist[] = {
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ifd.code,
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token("NOT", m),
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token("$else"+symb, m), token("JUMPI", m),
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thend.code,
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token("$endif"+symb, m), token("JUMP", m),
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token("~else"+symb, m), token("JUMPDEST", m),
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elsed.code,
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token("~endif"+symb, m), token("JUMPDEST", m)
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};
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return pd(aux, multiToken(nodelist, 12, m), outs);
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}
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// While (rewritten to this in rewrites)
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else if (node.val == "until") {
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programData cond = opcodeify(node.args[0], aux, height, dupvars);
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programData action = opcodeify(node.args[1], cond.aux, height, dupvars);
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aux = action.aux;
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if (!cond.outs)
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err("Condition of while/until loop has arity 0", m);
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if (action.outs) action.code = popwrap(action.code);
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Node nodelist[] = {
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token("~beg"+symb, m), token("JUMPDEST", m),
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cond.code,
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token("$end"+symb, m), token("JUMPI", m),
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action.code,
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token("$beg"+symb, m), token("JUMP", m),
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token("~end"+symb, m), token("JUMPDEST", m)
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};
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return pd(aux, multiToken(nodelist, 10, m));
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}
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// Memory allocations
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else if (node.val == "alloc") {
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programData bytez = opcodeify(node.args[0], aux, height, dupvars);
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aux = bytez.aux;
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if (!bytez.outs)
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err("Alloc input has arity 0", m);
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aux.allocUsed = true;
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Node nodelist[] = {
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bytez.code,
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token("MSIZE", m), token("SWAP1", m), token("MSIZE", m),
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token("ADD", m),
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token("0", m), token("SWAP1", m), token("MSTORE", m)
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};
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return pd(aux, multiToken(nodelist, 8, m), 1);
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}
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// Array literals
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else if (node.val == "array_lit") {
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aux.allocUsed = true;
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std::vector<Node> nodes;
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if (!node.args.size()) {
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nodes.push_back(token("MSIZE", m));
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return pd(aux, astnode("_", nodes, m));
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}
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nodes.push_back(token("MSIZE", m));
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nodes.push_back(token("0", m));
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nodes.push_back(token("MSIZE", m));
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nodes.push_back(token(unsignedToDecimal(node.args.size() * 32 - 1), m));
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nodes.push_back(token("ADD", m));
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nodes.push_back(token("MSTORE8", m));
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for (unsigned i = 0; i < node.args.size(); i++) {
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Metadata m2 = node.args[i].metadata;
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nodes.push_back(token("DUP1", m2));
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programData sub = opcodeify(node.args[i], aux, height + 2, dupvars);
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if (!sub.outs)
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err("Array_lit item " + unsignedToDecimal(i) + " has zero arity", m2);
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aux = sub.aux;
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nodes.push_back(sub.code);
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nodes.push_back(token("SWAP1", m2));
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if (i > 0) {
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nodes.push_back(token(unsignedToDecimal(i * 32), m2));
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nodes.push_back(token("ADD", m2));
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}
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nodes.push_back(token("MSTORE", m2));
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}
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return pd(aux, astnode("_", nodes, m), 1);
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}
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// All other functions/operators
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else {
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std::vector<Node> subs2;
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int depth = opinputs(upperCase(node.val));
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if (node.val != "debug") {
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if (depth == -1)
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err("Not a function or opcode: "+node.val, m);
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if ((int)node.args.size() != depth)
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err("Invalid arity for "+node.val, m);
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}
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for (int i = node.args.size() - 1; i >= 0; i--) {
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programData sub = opcodeify(node.args[i],
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aux,
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height - i - 1 + node.args.size(),
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dupvars);
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aux = sub.aux;
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if (!sub.outs)
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err("Input "+unsignedToDecimal(i)+" has arity 0", sub.code.metadata);
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subs2.push_back(sub.code);
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}
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if (node.val == "debug") {
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subs2.push_back(token("DUP"+unsignedToDecimal(node.args.size()), m));
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for (int i = 0; i <= (int)node.args.size(); i++)
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subs2.push_back(token("POP", m));
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}
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else subs2.push_back(token(upperCase(node.val), m));
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int outdepth = node.val == "debug" ? 0 : opoutputs(upperCase(node.val));
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return pd(aux, astnode("_", subs2, m), outdepth);
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}
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}
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// Adds necessary wrappers to a program
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Node finalize(programData c) {
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std::vector<Node> bottom;
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Metadata m = c.code.metadata;
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// If we are using both alloc and variables, we need to pre-zfill
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// some memory
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if ((c.aux.allocUsed || c.aux.calldataUsed) && c.aux.vars.size() > 0) {
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Node nodelist[] = {
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token("0", m),
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token(unsignedToDecimal(c.aux.vars.size() * 32 - 1)),
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token("MSTORE8", m)
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};
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bottom.push_back(multiToken(nodelist, 3, m));
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}
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// If msg.data is being used as an array, then we need to copy it
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if (c.aux.calldataUsed) {
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Node nodelist[] = {
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token("MSIZE", m), token("CALLDATASIZE", m), token("0", m),
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token("MSIZE", m), token("CALLDATACOPY", m),
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token(c.aux.vars["'msg.data"], m), token("MSTORE", m)
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};
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bottom.push_back(multiToken(nodelist, 7, m));
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}
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// The actual code
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bottom.push_back(c.code);
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return astnode("_", bottom, m);
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}
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//LLL -> code fragment tree
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Node buildFragmentTree(Node node) {
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return finalize(opcodeify(node));
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}
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// Builds a dictionary mapping labels to variable names
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programAux buildDict(Node program, programAux aux, int labelLength) {
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Metadata m = program.metadata;
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// Token
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if (program.type == TOKEN) {
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if (isNumberLike(program)) {
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aux.step += 1 + toByteArr(program.val, m).size();
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}
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else if (program.val[0] == '~') {
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aux.vars[program.val.substr(1)] = unsignedToDecimal(aux.step);
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}
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else if (program.val[0] == '$') {
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aux.step += labelLength + 1;
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}
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else aux.step += 1;
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}
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// A sub-program (ie. LLL)
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else if (program.val == "____CODE") {
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programAux auks = Aux();
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for (unsigned i = 0; i < program.args.size(); i++) {
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auks = buildDict(program.args[i], auks, labelLength);
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}
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for (std::map<std::string,std::string>::iterator it=auks.vars.begin();
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it != auks.vars.end();
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it++) {
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aux.vars[(*it).first] = (*it).second;
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}
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aux.step += auks.step;
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}
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// Normal sub-block
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else {
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for (unsigned i = 0; i < program.args.size(); i++) {
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aux = buildDict(program.args[i], aux, labelLength);
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}
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}
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return aux;
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}
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// Applies that dictionary
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Node substDict(Node program, programAux aux, int labelLength) {
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Metadata m = program.metadata;
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std::vector<Node> out;
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std::vector<Node> inner;
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if (program.type == TOKEN) {
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if (program.val[0] == '$') {
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std::string tokStr = "PUSH"+unsignedToDecimal(labelLength);
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out.push_back(token(tokStr, m));
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int dotLoc = program.val.find('.');
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if (dotLoc == -1) {
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std::string val = aux.vars[program.val.substr(1)];
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inner = toByteArr(val, m, labelLength);
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}
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else {
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std::string start = aux.vars[program.val.substr(1, dotLoc-1)],
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end = aux.vars[program.val.substr(dotLoc + 1)],
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dist = decimalSub(end, start);
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inner = toByteArr(dist, m, labelLength);
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}
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out.push_back(astnode("_", inner, m));
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}
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else if (program.val[0] == '~') { }
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else if (isNumberLike(program)) {
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inner = toByteArr(program.val, m);
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out.push_back(token("PUSH"+unsignedToDecimal(inner.size())));
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out.push_back(astnode("_", inner, m));
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}
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else return program;
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}
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else {
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for (unsigned i = 0; i < program.args.size(); i++) {
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Node n = substDict(program.args[i], aux, labelLength);
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if (n.type == TOKEN || n.args.size()) out.push_back(n);
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}
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}
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return astnode("_", out, m);
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}
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// Compiled fragtree -> compiled fragtree without labels
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Node dereference(Node program) {
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int sz = treeSize(program) * 4;
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int labelLength = 1;
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while (sz >= 256) { labelLength += 1; sz /= 256; }
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programAux aux = buildDict(program, Aux(), labelLength);
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return substDict(program, aux, labelLength);
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}
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// Dereferenced fragtree -> opcodes
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std::vector<Node> flatten(Node derefed) {
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std::vector<Node> o;
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if (derefed.type == TOKEN) {
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o.push_back(derefed);
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}
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else {
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for (unsigned i = 0; i < derefed.args.size(); i++) {
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std::vector<Node> oprime = flatten(derefed.args[i]);
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for (unsigned j = 0; j < oprime.size(); j++) o.push_back(oprime[j]);
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}
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}
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return o;
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}
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// Opcodes -> bin
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std::string serialize(std::vector<Node> codons) {
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std::string o;
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for (unsigned i = 0; i < codons.size(); i++) {
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int v;
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if (isNumberLike(codons[i])) {
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v = decimalToUnsigned(codons[i].val);
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}
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else if (codons[i].val.substr(0,4) == "PUSH") {
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v = 95 + decimalToUnsigned(codons[i].val.substr(4));
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}
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else {
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v = opcode(codons[i].val);
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}
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o += (char)v;
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}
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return o;
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}
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// Bin -> opcodes
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std::vector<Node> deserialize(std::string ser) {
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std::vector<Node> o;
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int backCount = 0;
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for (unsigned i = 0; i < ser.length(); i++) {
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unsigned char v = (unsigned char)ser[i];
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std::string oper = op((int)v);
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if (oper != "" && backCount <= 0) o.push_back(token(oper));
|
|
else if (v >= 96 && v < 128 && backCount <= 0) {
|
|
o.push_back(token("PUSH"+unsignedToDecimal(v - 95)));
|
|
}
|
|
else o.push_back(token(unsignedToDecimal(v)));
|
|
if (v >= 96 && v < 128 && backCount <= 0) {
|
|
backCount = v - 95;
|
|
}
|
|
else backCount--;
|
|
}
|
|
return o;
|
|
}
|
|
|
|
// Fragtree -> bin
|
|
std::string assemble(Node fragTree) {
|
|
return serialize(flatten(dereference(fragTree)));
|
|
}
|
|
|
|
// Fragtree -> tokens
|
|
std::vector<Node> prettyAssemble(Node fragTree) {
|
|
return flatten(dereference(fragTree));
|
|
}
|
|
|
|
// LLL -> bin
|
|
std::string compileLLL(Node program) {
|
|
return assemble(buildFragmentTree(program));
|
|
}
|
|
|
|
// LLL -> tokens
|
|
std::vector<Node> prettyCompileLLL(Node program) {
|
|
return prettyAssemble(buildFragmentTree(program));
|
|
}
|
|
|
|
// Converts a list of integer values to binary transaction data
|
|
std::string encodeDatalist(std::vector<std::string> vals) {
|
|
std::string o;
|
|
for (unsigned i = 0; i < vals.size(); i++) {
|
|
std::vector<Node> n = toByteArr(strToNumeric(vals[i]), Metadata(), 32);
|
|
for (unsigned j = 0; j < n.size(); j++) {
|
|
int v = decimalToUnsigned(n[j].val);
|
|
o += (char)v;
|
|
}
|
|
}
|
|
return o;
|
|
}
|
|
|
|
// Converts binary transaction data into a list of integer values
|
|
std::vector<std::string> decodeDatalist(std::string ser) {
|
|
std::vector<std::string> out;
|
|
for (unsigned i = 0; i < ser.length(); i+= 32) {
|
|
std::string o = "0";
|
|
for (unsigned j = i; j < i + 32; j++) {
|
|
int vj = (int)(unsigned char)ser[j];
|
|
o = decimalAdd(decimalMul(o, "256"), unsignedToDecimal(vj));
|
|
}
|
|
out.push_back(o);
|
|
}
|
|
return out;
|
|
}
|
|
|