void UnitEmitter::addTrivialPseudoMain() {
initMain(0, 0);
auto const mfe = getMain();
emitOp(OpInt);
emitInt64(1);
emitOp(OpRetC);
mfe->maxStackCells = 1;
mfe->finish(bcPos(), false);
recordFunction(mfe);
TypedValue mainReturn;
mainReturn.m_data.num = 1;
mainReturn.m_type = KindOfInt64;
m_mainReturn = mainReturn;
m_mergeOnly = true;
}
static void
emit(int c, const char *p1)
{
char ap [PATH_MAX];
SE;
emitOp(c, realpath(p1, ap), 0);
RE;
}
std::unique_ptr<UnitEmitter>
createFatalUnit(StringData* filename, const MD5& md5, FatalOp /*op*/,
StringData* err) {
auto ue = std::make_unique<UnitEmitter>(md5);
ue->m_filepath = filename;
ue->initMain(1, 1);
ue->emitOp(OpString);
ue->emitInt32(ue->mergeLitstr(err));
ue->emitOp(OpFatal);
ue->emitByte(static_cast<uint8_t>(FatalOp::Runtime));
FuncEmitter* fe = ue->getMain();
fe->maxStackCells = 1;
// XXX line numbers are bogus
fe->finish(ue->bcPos(), false);
ue->recordFunction(fe);
return ue;
}
int
unlink(const char *p)
{
int r;
char b [PATH_MAX];
char *rp;
static int (*ounlink) (const char *)= 0;
DP;
R(unlink);
rp = realpath(p, b);
r = ounlink(p);
if (!r)
emitOp('d', rp, 0);
DD;
return r;
}
int
renameat(int fd1, const char *p1, int fd2, const char *p2)
{
int r;
D;
if (fd1 != AT_FDCWD || fd2 != AT_FDCWD) {
static int (*orenameat) (const char *, const char *)= 0;
R(renameat);
r = orenameat(p1, p2);
if (!r)
emitOp('R', p2, p1);
} else
r = rename(p1, p2);
DD;
return r;
}
int
openat64(int fd, const char *p, int f, mode_t m)
{
int r;
DP;
if (fd != AT_FDCWD) {
static int (*oopenat64) (int, const char *, int, mode_t)= 0;
R(openat64);
r = oopenat64(fd, p, f, m);
if (r >= 0)
emitOp(f & wmode ? 'W' : 'R', p, 0);
} else
r = open64(p, f, m);
DD;
return r;
}
int
rename(const char *p1, const char *p2)
{
int r;
char b1 [PATH_MAX];
char *rp1 = realpath(p1, b1);
static int (*orename) (const char *, const char *)= 0;
D;
R(rename);
r = orename(p1, p2);
if (!r) {
char b2 [PATH_MAX];
char *rp2 = realpath(p2, b2);
emitOp(rp1 ? 'm' : 'M', rp2, rp1);
}
DD;
return r;
}
int
unlinkat(int fd, const char *p, int f)
{
int r;
DP;
if (fd != AT_FDCWD) {
static int (*ounlinkat) (int fd, const char *p, int f);
R(unlinkat);
r = ounlinkat(fd, p, f);
if (!r)
emitOp('D', p, 0);
assert(0);
} else if (f & AT_REMOVEDIR)
r = rmdir(p);
else
r = unlink(p);
DD;
return r;
}
static void
fdemit(int c, int fd)
{
char ap [PATH_MAX];
int ok;
SE;
#ifdef F_GETPATH
ok = -1 != fcntl(fd, F_GETPATH, ap);
#else
{
ssize_t written;
char fdpath [100];
snprintf(fdpath, sizeof(fdpath), "/proc/self/fd/%d", fd);
written = readlink(fdpath, ap, sizeof(ap));
ok = written >= 0 && written < sizeof(ap);
if (ok)
ap[written] = 0;
}
#endif
emitOp(c, ok ? ap : 0, 0);
RE;
}
void Parser::emitOp(Ast &ast) {
Ast copy = ast;
emitOp(std::move(copy));
}
void Parser::emitOp(Op op, double d) {
Ast &&ast = Ast::create(op);
ast.d = d;
emitOp(ast);
}
void Parser::emitOp(Op op, int i) {
Ast &&ast = Ast::create(op);
ast.i = i;
emitOp(ast);
}
int Parser::parse() {
std::stack<Token> stack;
ast.op = OP_HLT;
ast.i = 0;
lastTokenId = TOK_NONE;
lastOp = -1;
tok = scanner.getNextToken();
while (tok.id != TOK_EOF) {
bool expectUnary = lastTokenId == TOK_LPAREN
|| lastTokenId == TOK_NONE
|| canBePrefix(lastTokenId)
|| canBeInfix(lastTokenId);
bool expectExpr = lastTokenId == TOK_NONE
|| lastTokenId == TOK_LPAREN
|| canBePrefix(lastTokenId)
|| canBeInfix(lastTokenId);
switch (tok.id) {
default:
raiseError("unknown token");
return 1;
case TOK_ERROR:
raiseError(tok.err);
return 1;
case TOK_PLUS:
if (expectUnary)
tok.id = TOK_UN_PLUS;
else
tok.id = TOK_OP_ADD;
continue;
case TOK_MINUS:
if (expectUnary)
tok.id = TOK_UN_NEG;
else
tok.id = TOK_OP_SUB;
continue;
case TOK_ARG:
if (canBeValue(lastTokenId)) {
raiseError("unexpected primary value");
return 1;
}
if (tok.i > UCHAR_MAX) {
raiseError("argument number out of range");
return 1;
}
emitOp(OP_ARG, (unsigned char)(tok.i));
break;
case TOK_LIT:
if (canBeValue(lastTokenId)) {
raiseError("unexpected primary value");
return 1;
}
emitOp(OP_CONST, tok.d);
break;
case TOK_F_PI:
if (canBeValue(lastTokenId)) {
raiseError("unexpected primary value");
return 1;
}
emitOp(OP_PI);
break;
case TOK_F_E:
if (canBeValue(lastTokenId)) {
raiseError("unexpected primary value");
return 1;
}
emitOp(OP_E);
break;
case TOK_UN_PLUS:
// unary plus is a noop
break;
case TOK_LPAREN:
if (!canBeFunction(lastTokenId) && !expectExpr) {
raiseError("unexpected open parenthesis");
return 1;
}
stack.push(tok);
break;
case TOK_F_SQRT:
case TOK_F_SIN:
case TOK_F_COS:
case TOK_F_TAN:
case TOK_F_ASIN:
case TOK_F_ACOS:
case TOK_F_ATAN:
case TOK_F_SINH:
case TOK_F_COSH:
case TOK_F_TANH:
case TOK_F_ASINH:
case TOK_F_ACOSH:
case TOK_F_ATANH:
case TOK_F_EXP:
case TOK_F_LOG:
case TOK_F_ERF:
case TOK_F_ERFC:
case TOK_F_ABS:
case TOK_F_FLOOR:
case TOK_F_CEIL:
case TOK_F_ROUND:
case TOK_F_TRUNC:
case TOK_F_POW:
case TOK_UN_NEG:
if (canBeValue(lastTokenId)) {
raiseError("unexpected prefix operator");
return 1;
}
stack.push(tok);
break;
case TOK_COMMA:
while (stack.size() > 0 && stack.top().id != TOK_LPAREN) {
emitOp(getOperator(stack.top().id));
stack.pop();
}
if (stack.size() <= 0 || stack.top().id != TOK_LPAREN) {
raiseError("misplaced comma");
return 1;
}
break;
case TOK_RPAREN:
while (stack.size() > 0 && stack.top().id != TOK_LPAREN) {
emitOp(getOperator(stack.top().id));
stack.pop();
}
if (stack.size() <= 0 || stack.top().id != TOK_LPAREN) {
raiseError("mismatched parenthesis");
return 1;
}
stack.pop();
while (stack.size() > 0 && canBePrefix(stack.top().id)) {
emitOp(getOperator(stack.top().id));
stack.pop();
}
break;
case TOK_OP_ADD:
case TOK_OP_SUB:
case TOK_OP_MUL:
case TOK_OP_DIV:
case TOK_OP_POW:
if (!canBeValue(lastTokenId)) {
raiseError("unexpected operator");
return 1;
}
while (stack.size() > 0 && canBeOperation(stack.top().id)) {
if (isRightAssociative(tok.id)) {
if (getPrecedence(tok.id) < getPrecedence(stack.top().id)) {
emitOp(getOperator(stack.top().id));
stack.pop();
} else
break;
} else {
if (getPrecedence(tok.id) <= getPrecedence(stack.top().id)) {
emitOp(getOperator(stack.top().id));
stack.pop();
} else
break;
}
}
stack.push(tok);
break;
}
lastTokenId = tok.id;
tok = scanner.getNextToken();
}
if (!canBeValue(lastTokenId)) {
raiseError("unexpected program end");
return 1;
}
while (stack.size() > 0) {
if (stack.top().id == TOK_LPAREN || stack.top().id == TOK_RPAREN) {
raiseError("mismatched parenthesis");
return 1;
} else {
emitOp(getOperator(stack.top().id));
stack.pop();
}
}
return 0;
}
Bytecode::Bytecode() : size(0) {
emitOp(FRAME);
emitOp(INVK);
emitReference(getLabel("main"));
emitOp(EXIT);
}
