#include <stdio.h>
#include <iostream>
#include <vector>
#include <map>
#include "util.h"
#include "lllparser.h"
#include "bignum.h"
#include "optimize.h"
#include "rewriteutils.h"
#include "preprocess.h"
#include "functions.h"
std::string getSignature(std::vector<Node> args) {
std::string o;
for (unsigned i = 0; i < args.size(); i++) {
if (args[i].val == ":" && args[i].args[1].val == "s")
o += "s";
else if (args[i].val == ":" && args[i].args[1].val == "a")
o += "a";
else
o += "i";
}
return o;
}
// Convert a list of arguments into a node containing a
// < datastart, datasz > pair
Node packArguments(std::vector<Node> args, std::string sig,
int funId, Metadata m) {
// Plain old 32 byte arguments
std::vector<Node> nargs;
// Variable-sized arguments
std::vector<Node> vargs;
// Variable sizes
std::vector<Node> sizes;
// Is a variable an array?
std::vector<bool> isArray;
// Fill up above three argument lists
int argCount = 0;
for (unsigned i = 0; i < args.size(); i++) {
Metadata m = args[i].metadata;
if (args[i].val == "=") {
// do nothing
}
else {
// Determine the correct argument type
char argType;
if (sig.size() > 0) {
if (argCount >= (signed)sig.size())
err("Too many args", m);
argType = sig[argCount];
}
else argType = 'i';
// Integer (also usable for short strings)
if (argType == 'i') {
if (args[i].val == ":")
err("Function asks for int, provided string or array", m);
nargs.push_back(args[i]);
}
// Long string
else if (argType == 's') {
if (args[i].val != ":")
err("Must specify string length", m);
vargs.push_back(args[i].args[0]);
sizes.push_back(args[i].args[1]);
isArray.push_back(false);
}
// Array
else if (argType == 'a') {
if (args[i].val != ":")
err("Must specify array length", m);
vargs.push_back(args[i].args[0]);
sizes.push_back(args[i].args[1]);
isArray.push_back(true);
}
else err("Invalid arg type in signature", m);
argCount++;
}
}
int static_arg_size = 1 + (vargs.size() + nargs.size()) * 32;
// Start off by saving the size variables and calculating the total
msn kwargs;
kwargs["funid"] = tkn(utd(funId), m);
std::string pattern =
"(with _sztot "+utd(static_arg_size)+" "
" (with _sizes (alloc "+utd(sizes.size() * 32)+") "
" (seq ";
for (unsigned i = 0; i < sizes.size(); i++) {
std::string sizeIncrement =
isArray[i] ? "(mul 32 _x)" : "_x";
pattern +=
"(with _x $sz"+utd(i)+"(seq "
" (mstore (add _sizes "+utd(i * 32)+") _x) "
" (set _sztot (add _sztot "+sizeIncrement+" )))) ";
kwargs["sz"+utd(i)] = sizes[i];
}
// Allocate memory, and set first data byte
pattern +=
"(with _datastart (alloc (add _sztot 32)) (seq "
" (mstore8 _datastart $funid) ";
// Copy over size variables
for (unsigned i = 0; i < sizes.size(); i++) {
int v = 1 + i * 32;
pattern +=
" (mstore "
" (add _datastart "+utd(v)+") "
" (mload (add _sizes "+utd(v-1)+"))) ";
}
// Store normal arguments
for (unsigned i = 0; i < nargs.size(); i++) {
int v = 1 + (i + sizes.size()) * 32;
pattern +=
" (mstore (add _datastart "+utd(v)+") $"+utd(i)+") ";
kwargs[utd(i)] = nargs[i];
}
// Loop through variable-sized arguments, store them
pattern +=
" (with _pos (add _datastart "+utd(static_arg_size)+") (seq";
for (unsigned i = 0; i < vargs.size(); i++) {
std::string copySize =
isArray[i] ? "(mul 32 (mload (add _sizes "+utd(i * 32)+")))"
: "(mload (add _sizes "+utd(i * 32)+"))";
pattern +=
" (unsafe_mcopy _pos $vl"+utd(i)+" "+copySize+") "
" (set _pos (add _pos "+copySize+")) ";
kwargs["vl"+utd(i)] = vargs[i];
}
// Return a 2-item array containing the start and size
pattern += " (array_lit _datastart _sztot))))))))";
std::string prefix = "_temp_"+mkUniqueToken();
// Fill in pattern, return triple
return subst(parseLLL(pattern), kwargs, prefix, m);
}
// Create a node for argument unpacking
Node unpackArguments(std::vector<Node> vars, Metadata m) {
std::vector<std::string> varNames;
std::vector<std::string> longVarNames;
std::vector<bool> longVarIsArray;
// Fill in variable and long variable names, as well as which
// long variables are arrays and which are strings
for (unsigned i = 0; i < vars.size(); i++) {
if (vars[i].val == ":") {
if (vars[i].args.size() != 2)
err("Malformed def!", m);
longVarNames.push_back(vars[i].args[0].val);
std::string tag = vars[i].args[1].val;
if (tag == "s")
longVarIsArray.push_back(false);
else if (tag == "a")
longVarIsArray.push_back(true);
else
err("Function value can only be string or array", m);
}
else {
varNames.push_back(vars[i].val);
}
}
std::vector<Node> sub;
if (!varNames.size() && !longVarNames.size()) {
// do nothing if we have no arguments
}
else {
std::vector<Node> varNodes;
for (unsigned i = 0; i < longVarNames.size(); i++)
varNodes.push_back(token(longVarNames[i], m));
for (unsigned i = 0; i < varNames.size(); i++)
varNodes.push_back(token(varNames[i], m));
// Copy over variable lengths and short variables
for (unsigned i = 0; i < varNodes.size(); i++) {
int pos = 1 + i * 32;
std::string prefix = (i < longVarNames.size()) ? "_len_" : "";
sub.push_back(asn("untyped", asn("set",
token(prefix+varNodes[i].val, m),
asn("calldataload", tkn(utd(pos), m), m),
m)));
}
// Copy over long variables
if (longVarNames.size() > 0) {
std::vector<Node> sub2;
int pos = varNodes.size() * 32 + 1;
Node tot = tkn("_tot", m);
for (unsigned i = 0; i < longVarNames.size(); i++) {
Node var = tkn(longVarNames[i], m);
Node varlen = longVarIsArray[i]
? asn("mul", tkn("32", m), tkn("_len_"+longVarNames[i], m))
: tkn("_len_"+longVarNames[i], m);
sub2.push_back(asn("untyped",
asn("set", var, asn("alloc", varlen))));
sub2.push_back(asn("calldatacopy", var, tot, varlen));
sub2.push_back(asn("set", tot, asn("add", tot, varlen)));
}
std::string prefix = "_temp_"+mkUniqueToken();
sub.push_back(subst(
astnode("with", tot, tkn(utd(pos), m), asn("seq", sub2)),
msn(),
prefix,
m));
}
}
return asn("seq", sub, m);
}
