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jscompile.c
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jscompile.c
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#include "jsi.h"
#define cexp jsC_cexp /* collision with math.h */
#define JF js_State *J, js_Function *F
JS_NORETURN void jsC_error(js_State *J, js_Ast *node, const char *fmt, ...) JS_PRINTFLIKE(3,4);
static void cfunbody(JF, js_Ast *name, js_Ast *params, js_Ast *body);
static void cexp(JF, js_Ast *exp);
static void cstmlist(JF, js_Ast *list);
static void cstm(JF, js_Ast *stm);
void jsC_error(js_State *J, js_Ast *node, const char *fmt, ...)
{
va_list ap;
char buf[512];
char msgbuf[256];
va_start(ap, fmt);
vsnprintf(msgbuf, 256, fmt, ap);
va_end(ap);
snprintf(buf, 256, "%s:%d: ", J->filename, node->line);
strcat(buf, msgbuf);
js_newsyntaxerror(J, buf);
js_throw(J);
}
static const char *futurewords[] = {
"class", "const", "enum", "export", "extends", "import", "super",
};
static const char *strictfuturewords[] = {
"implements", "interface", "let", "package", "private", "protected",
"public", "static", "yield",
};
static void checkfutureword(JF, js_Ast *exp)
{
if (jsY_findword(exp->string, futurewords, nelem(futurewords)) >= 0)
jsC_error(J, exp, "'%s' is a future reserved word", exp->string);
if (F->strict) {
if (jsY_findword(exp->string, strictfuturewords, nelem(strictfuturewords)) >= 0)
jsC_error(J, exp, "'%s' is a strict mode future reserved word", exp->string);
}
}
static js_Function *newfun(js_State *J, int line, js_Ast *name, js_Ast *params, js_Ast *body, int script, int default_strict)
{
js_Function *F = js_malloc(J, sizeof *F);
memset(F, 0, sizeof *F);
F->gcmark = 0;
F->gcnext = J->gcfun;
J->gcfun = F;
++J->gccounter;
F->filename = js_intern(J, J->filename);
F->line = line;
F->script = script;
F->strict = default_strict;
F->name = name ? name->string : "";
cfunbody(J, F, name, params, body);
return F;
}
/* Emit opcodes, constants and jumps */
static void emitraw(JF, int value)
{
if (value != (js_Instruction)value)
js_syntaxerror(J, "integer overflow in instruction coding");
if (F->codelen >= F->codecap) {
F->codecap = F->codecap ? F->codecap * 2 : 64;
F->code = js_realloc(J, F->code, F->codecap * sizeof *F->code);
}
F->code[F->codelen++] = value;
}
static void emit(JF, int value)
{
emitraw(J, F, F->lastline);
emitraw(J, F, value);
}
static void emitarg(JF, int value)
{
emitraw(J, F, value);
}
static void emitline(JF, js_Ast *node)
{
F->lastline = node->line;
}
static int addfunction(JF, js_Function *value)
{
if (F->funlen >= F->funcap) {
F->funcap = F->funcap ? F->funcap * 2 : 16;
F->funtab = js_realloc(J, F->funtab, F->funcap * sizeof *F->funtab);
}
F->funtab[F->funlen] = value;
return F->funlen++;
}
static int addlocal(JF, js_Ast *ident, int reuse)
{
const char *name = ident->string;
if (F->strict) {
if (!strcmp(name, "arguments"))
jsC_error(J, ident, "redefining 'arguments' is not allowed in strict mode");
if (!strcmp(name, "eval"))
jsC_error(J, ident, "redefining 'eval' is not allowed in strict mode");
} else {
if (!strcmp(name, "eval"))
js_evalerror(J, "%s:%d: invalid use of 'eval'", J->filename, ident->line);
}
if (reuse || F->strict) {
int i;
for (i = 0; i < F->varlen; ++i) {
if (!strcmp(F->vartab[i], name)) {
if (reuse)
return i+1;
if (F->strict)
jsC_error(J, ident, "duplicate formal parameter '%s'", name);
}
}
}
if (F->varlen >= F->varcap) {
F->varcap = F->varcap ? F->varcap * 2 : 16;
F->vartab = js_realloc(J, F->vartab, F->varcap * sizeof *F->vartab);
}
F->vartab[F->varlen] = name;
return ++F->varlen;
}
static int findlocal(JF, const char *name)
{
int i;
for (i = F->varlen; i > 0; --i)
if (!strcmp(F->vartab[i-1], name))
return i;
return -1;
}
static void emitfunction(JF, js_Function *fun)
{
F->lightweight = 0;
emit(J, F, OP_CLOSURE);
emitarg(J, F, addfunction(J, F, fun));
}
static void emitnumber(JF, double num)
{
if (num == 0) {
emit(J, F, OP_INTEGER);
emitarg(J, F, 32768);
if (signbit(num))
emit(J, F, OP_NEG);
} else if (num >= SHRT_MIN && num <= SHRT_MAX && num == (int)num) {
emit(J, F, OP_INTEGER);
emitarg(J, F, num + 32768);
} else {
#define N (sizeof(num) / sizeof(js_Instruction))
js_Instruction x[N];
size_t i;
emit(J, F, OP_NUMBER);
memcpy(x, &num, sizeof(num));
for (i = 0; i < N; ++i)
emitarg(J, F, x[i]);
#undef N
}
}
static void emitstring(JF, int opcode, const char *str)
{
#define N (sizeof(str) / sizeof(js_Instruction))
js_Instruction x[N];
size_t i;
emit(J, F, opcode);
memcpy(x, &str, sizeof(str));
for (i = 0; i < N; ++i)
emitarg(J, F, x[i]);
#undef N
}
static void emitlocal(JF, int oploc, int opvar, js_Ast *ident)
{
int is_arguments = !strcmp(ident->string, "arguments");
int is_eval = !strcmp(ident->string, "eval");
int i;
if (is_arguments) {
F->lightweight = 0;
F->arguments = 1;
}
checkfutureword(J, F, ident);
if (F->strict && oploc == OP_SETLOCAL) {
if (is_arguments)
jsC_error(J, ident, "'arguments' is read-only in strict mode");
if (is_eval)
jsC_error(J, ident, "'eval' is read-only in strict mode");
}
if (is_eval)
js_evalerror(J, "%s:%d: invalid use of 'eval'", J->filename, ident->line);
i = findlocal(J, F, ident->string);
if (i < 0) {
emitstring(J, F, opvar, ident->string);
} else {
emit(J, F, oploc);
emitarg(J, F, i);
}
}
static int here(JF)
{
return F->codelen;
}
static int emitjump(JF, int opcode)
{
int inst;
emit(J, F, opcode);
inst = F->codelen;
emitarg(J, F, 0);
return inst;
}
static void emitjumpto(JF, int opcode, int dest)
{
emit(J, F, opcode);
if (dest != (js_Instruction)dest)
js_syntaxerror(J, "jump address integer overflow");
emitarg(J, F, dest);
}
static void labelto(JF, int inst, int addr)
{
if (addr != (js_Instruction)addr)
js_syntaxerror(J, "jump address integer overflow");
F->code[inst] = addr;
}
static void label(JF, int inst)
{
labelto(J, F, inst, F->codelen);
}
/* Expressions */
static void ctypeof(JF, js_Ast *exp)
{
if (exp->a->type == EXP_IDENTIFIER) {
emitline(J, F, exp->a);
emitlocal(J, F, OP_GETLOCAL, OP_HASVAR, exp->a);
} else {
cexp(J, F, exp->a);
}
emitline(J, F, exp);
emit(J, F, OP_TYPEOF);
}
static void cunary(JF, js_Ast *exp, int opcode)
{
cexp(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, opcode);
}
static void cbinary(JF, js_Ast *exp, int opcode)
{
cexp(J, F, exp->a);
cexp(J, F, exp->b);
emitline(J, F, exp);
emit(J, F, opcode);
}
static void carray(JF, js_Ast *list)
{
while (list) {
emitline(J, F, list->a);
if (list->a->type == EXP_ELISION) {
emit(J, F, OP_SKIPARRAY);
} else {
cexp(J, F, list->a);
emit(J, F, OP_INITARRAY);
}
list = list->b;
}
}
static void checkdup(JF, js_Ast *list, js_Ast *end)
{
char nbuf[32], sbuf[32];
const char *needle, *straw;
if (end->a->type == EXP_NUMBER)
needle = jsV_numbertostring(J, nbuf, end->a->number);
else
needle = end->a->string;
while (list->a != end) {
if (list->a->type == end->type) {
js_Ast *prop = list->a->a;
if (prop->type == EXP_NUMBER)
straw = jsV_numbertostring(J, sbuf, prop->number);
else
straw = prop->string;
if (!strcmp(needle, straw))
jsC_error(J, list, "duplicate property '%s' in object literal", needle);
}
list = list->b;
}
}
static void cobject(JF, js_Ast *list)
{
js_Ast *head = list;
while (list) {
js_Ast *kv = list->a;
js_Ast *prop = kv->a;
if (prop->type == AST_IDENTIFIER || prop->type == EXP_STRING) {
emitline(J, F, prop);
emitstring(J, F, OP_STRING, prop->string);
} else if (prop->type == EXP_NUMBER) {
emitline(J, F, prop);
emitnumber(J, F, prop->number);
} else {
jsC_error(J, prop, "invalid property name in object initializer");
}
if (F->strict)
checkdup(J, F, head, kv);
switch (kv->type) {
default: /* impossible */ break;
case EXP_PROP_VAL:
cexp(J, F, kv->b);
emitline(J, F, kv);
emit(J, F, OP_INITPROP);
break;
case EXP_PROP_GET:
emitfunction(J, F, newfun(J, prop->line, NULL, NULL, kv->c, 0, F->strict));
emitline(J, F, kv);
emit(J, F, OP_INITGETTER);
break;
case EXP_PROP_SET:
emitfunction(J, F, newfun(J, prop->line, NULL, kv->b, kv->c, 0, F->strict));
emitline(J, F, kv);
emit(J, F, OP_INITSETTER);
break;
}
list = list->b;
}
}
static int cargs(JF, js_Ast *list)
{
int n = 0;
while (list) {
cexp(J, F, list->a);
list = list->b;
++n;
}
return n;
}
static void cassign(JF, js_Ast *exp)
{
js_Ast *lhs = exp->a;
js_Ast *rhs = exp->b;
switch (lhs->type) {
case EXP_IDENTIFIER:
cexp(J, F, rhs);
emitline(J, F, exp);
emitlocal(J, F, OP_SETLOCAL, OP_SETVAR, lhs);
break;
case EXP_INDEX:
cexp(J, F, lhs->a);
cexp(J, F, lhs->b);
cexp(J, F, rhs);
emitline(J, F, exp);
emit(J, F, OP_SETPROP);
break;
case EXP_MEMBER:
cexp(J, F, lhs->a);
cexp(J, F, rhs);
emitline(J, F, exp);
emitstring(J, F, OP_SETPROP_S, lhs->b->string);
break;
default:
jsC_error(J, lhs, "invalid l-value in assignment");
}
}
static void cassignforin(JF, js_Ast *stm)
{
js_Ast *lhs = stm->a;
if (stm->type == STM_FOR_IN_VAR) {
if (lhs->b)
jsC_error(J, lhs->b, "more than one loop variable in for-in statement");
emitline(J, F, lhs->a);
emitlocal(J, F, OP_SETLOCAL, OP_SETVAR, lhs->a->a); /* list(var-init(ident)) */
emit(J, F, OP_POP);
return;
}
switch (lhs->type) {
case EXP_IDENTIFIER:
emitline(J, F, lhs);
emitlocal(J, F, OP_SETLOCAL, OP_SETVAR, lhs);
emit(J, F, OP_POP);
break;
case EXP_INDEX:
cexp(J, F, lhs->a);
cexp(J, F, lhs->b);
emitline(J, F, lhs);
emit(J, F, OP_ROT3);
emit(J, F, OP_SETPROP);
emit(J, F, OP_POP);
break;
case EXP_MEMBER:
cexp(J, F, lhs->a);
emitline(J, F, lhs);
emit(J, F, OP_ROT2);
emitstring(J, F, OP_SETPROP_S, lhs->b->string);
emit(J, F, OP_POP);
break;
default:
jsC_error(J, lhs, "invalid l-value in for-in loop assignment");
}
}
static void cassignop1(JF, js_Ast *lhs)
{
switch (lhs->type) {
case EXP_IDENTIFIER:
emitline(J, F, lhs);
emitlocal(J, F, OP_GETLOCAL, OP_GETVAR, lhs);
break;
case EXP_INDEX:
cexp(J, F, lhs->a);
cexp(J, F, lhs->b);
emitline(J, F, lhs);
emit(J, F, OP_DUP2);
emit(J, F, OP_GETPROP);
break;
case EXP_MEMBER:
cexp(J, F, lhs->a);
emitline(J, F, lhs);
emit(J, F, OP_DUP);
emitstring(J, F, OP_GETPROP_S, lhs->b->string);
break;
default:
jsC_error(J, lhs, "invalid l-value in assignment");
}
}
static void cassignop2(JF, js_Ast *lhs, int postfix)
{
switch (lhs->type) {
case EXP_IDENTIFIER:
emitline(J, F, lhs);
if (postfix) emit(J, F, OP_ROT2);
emitlocal(J, F, OP_SETLOCAL, OP_SETVAR, lhs);
break;
case EXP_INDEX:
emitline(J, F, lhs);
if (postfix) emit(J, F, OP_ROT4);
emit(J, F, OP_SETPROP);
break;
case EXP_MEMBER:
emitline(J, F, lhs);
if (postfix) emit(J, F, OP_ROT3);
emitstring(J, F, OP_SETPROP_S, lhs->b->string);
break;
default:
jsC_error(J, lhs, "invalid l-value in assignment");
}
}
static void cassignop(JF, js_Ast *exp, int opcode)
{
js_Ast *lhs = exp->a;
js_Ast *rhs = exp->b;
cassignop1(J, F, lhs);
cexp(J, F, rhs);
emitline(J, F, exp);
emit(J, F, opcode);
cassignop2(J, F, lhs, 0);
}
static void cdelete(JF, js_Ast *exp)
{
js_Ast *arg = exp->a;
switch (arg->type) {
case EXP_IDENTIFIER:
if (F->strict)
jsC_error(J, exp, "delete on an unqualified name is not allowed in strict mode");
emitline(J, F, exp);
emitlocal(J, F, OP_DELLOCAL, OP_DELVAR, arg);
break;
case EXP_INDEX:
cexp(J, F, arg->a);
cexp(J, F, arg->b);
emitline(J, F, exp);
emit(J, F, OP_DELPROP);
break;
case EXP_MEMBER:
cexp(J, F, arg->a);
emitline(J, F, exp);
emitstring(J, F, OP_DELPROP_S, arg->b->string);
break;
default:
jsC_error(J, exp, "invalid l-value in delete expression");
}
}
static void ceval(JF, js_Ast *fun, js_Ast *args)
{
int n = cargs(J, F, args);
F->lightweight = 0;
F->arguments = 1;
if (n == 0)
emit(J, F, OP_UNDEF);
else while (n-- > 1)
emit(J, F, OP_POP);
emit(J, F, OP_EVAL);
}
static void ccall(JF, js_Ast *fun, js_Ast *args)
{
int n;
switch (fun->type) {
case EXP_INDEX:
cexp(J, F, fun->a);
emit(J, F, OP_DUP);
cexp(J, F, fun->b);
emit(J, F, OP_GETPROP);
emit(J, F, OP_ROT2);
break;
case EXP_MEMBER:
cexp(J, F, fun->a);
emit(J, F, OP_DUP);
emitstring(J, F, OP_GETPROP_S, fun->b->string);
emit(J, F, OP_ROT2);
break;
case EXP_IDENTIFIER:
if (!strcmp(fun->string, "eval")) {
ceval(J, F, fun, args);
return;
}
/* fallthrough */
default:
cexp(J, F, fun);
emit(J, F, OP_UNDEF);
break;
}
n = cargs(J, F, args);
emit(J, F, OP_CALL);
emitarg(J, F, n);
}
static void cexp(JF, js_Ast *exp)
{
int then, end;
int n;
switch (exp->type) {
case EXP_STRING:
emitline(J, F, exp);
emitstring(J, F, OP_STRING, exp->string);
break;
case EXP_NUMBER:
emitline(J, F, exp);
emitnumber(J, F, exp->number);
break;
case EXP_ELISION:
break;
case EXP_NULL:
emitline(J, F, exp);
emit(J, F, OP_NULL);
break;
case EXP_TRUE:
emitline(J, F, exp);
emit(J, F, OP_TRUE);
break;
case EXP_FALSE:
emitline(J, F, exp);
emit(J, F, OP_FALSE);
break;
case EXP_THIS:
emitline(J, F, exp);
emit(J, F, OP_THIS);
break;
case EXP_REGEXP:
emitline(J, F, exp);
emitstring(J, F, OP_NEWREGEXP, exp->string);
emitarg(J, F, exp->number);
break;
case EXP_OBJECT:
emitline(J, F, exp);
emit(J, F, OP_NEWOBJECT);
cobject(J, F, exp->a);
break;
case EXP_ARRAY:
emitline(J, F, exp);
emit(J, F, OP_NEWARRAY);
carray(J, F, exp->a);
break;
case EXP_FUN:
emitline(J, F, exp);
emitfunction(J, F, newfun(J, exp->line, exp->a, exp->b, exp->c, 0, F->strict));
break;
case EXP_IDENTIFIER:
emitline(J, F, exp);
emitlocal(J, F, OP_GETLOCAL, OP_GETVAR, exp);
break;
case EXP_INDEX:
cexp(J, F, exp->a);
cexp(J, F, exp->b);
emitline(J, F, exp);
emit(J, F, OP_GETPROP);
break;
case EXP_MEMBER:
cexp(J, F, exp->a);
emitline(J, F, exp);
emitstring(J, F, OP_GETPROP_S, exp->b->string);
break;
case EXP_CALL:
ccall(J, F, exp->a, exp->b);
break;
case EXP_NEW:
cexp(J, F, exp->a);
n = cargs(J, F, exp->b);
emitline(J, F, exp);
emit(J, F, OP_NEW);
emitarg(J, F, n);
break;
case EXP_DELETE:
cdelete(J, F, exp);
break;
case EXP_PREINC:
cassignop1(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, OP_INC);
cassignop2(J, F, exp->a, 0);
break;
case EXP_PREDEC:
cassignop1(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, OP_DEC);
cassignop2(J, F, exp->a, 0);
break;
case EXP_POSTINC:
cassignop1(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, OP_POSTINC);
cassignop2(J, F, exp->a, 1);
emit(J, F, OP_POP);
break;
case EXP_POSTDEC:
cassignop1(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, OP_POSTDEC);
cassignop2(J, F, exp->a, 1);
emit(J, F, OP_POP);
break;
case EXP_VOID:
cexp(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, OP_POP);
emit(J, F, OP_UNDEF);
break;
case EXP_TYPEOF: ctypeof(J, F, exp); break;
case EXP_POS: cunary(J, F, exp, OP_POS); break;
case EXP_NEG: cunary(J, F, exp, OP_NEG); break;
case EXP_BITNOT: cunary(J, F, exp, OP_BITNOT); break;
case EXP_LOGNOT: cunary(J, F, exp, OP_LOGNOT); break;
case EXP_BITOR: cbinary(J, F, exp, OP_BITOR); break;
case EXP_BITXOR: cbinary(J, F, exp, OP_BITXOR); break;
case EXP_BITAND: cbinary(J, F, exp, OP_BITAND); break;
case EXP_EQ: cbinary(J, F, exp, OP_EQ); break;
case EXP_NE: cbinary(J, F, exp, OP_NE); break;
case EXP_STRICTEQ: cbinary(J, F, exp, OP_STRICTEQ); break;
case EXP_STRICTNE: cbinary(J, F, exp, OP_STRICTNE); break;
case EXP_LT: cbinary(J, F, exp, OP_LT); break;
case EXP_GT: cbinary(J, F, exp, OP_GT); break;
case EXP_LE: cbinary(J, F, exp, OP_LE); break;
case EXP_GE: cbinary(J, F, exp, OP_GE); break;
case EXP_INSTANCEOF: cbinary(J, F, exp, OP_INSTANCEOF); break;
case EXP_IN: cbinary(J, F, exp, OP_IN); break;
case EXP_SHL: cbinary(J, F, exp, OP_SHL); break;
case EXP_SHR: cbinary(J, F, exp, OP_SHR); break;
case EXP_USHR: cbinary(J, F, exp, OP_USHR); break;
case EXP_ADD: cbinary(J, F, exp, OP_ADD); break;
case EXP_SUB: cbinary(J, F, exp, OP_SUB); break;
case EXP_MUL: cbinary(J, F, exp, OP_MUL); break;
case EXP_DIV: cbinary(J, F, exp, OP_DIV); break;
case EXP_MOD: cbinary(J, F, exp, OP_MOD); break;
case EXP_ASS: cassign(J, F, exp); break;
case EXP_ASS_MUL: cassignop(J, F, exp, OP_MUL); break;
case EXP_ASS_DIV: cassignop(J, F, exp, OP_DIV); break;
case EXP_ASS_MOD: cassignop(J, F, exp, OP_MOD); break;
case EXP_ASS_ADD: cassignop(J, F, exp, OP_ADD); break;
case EXP_ASS_SUB: cassignop(J, F, exp, OP_SUB); break;
case EXP_ASS_SHL: cassignop(J, F, exp, OP_SHL); break;
case EXP_ASS_SHR: cassignop(J, F, exp, OP_SHR); break;
case EXP_ASS_USHR: cassignop(J, F, exp, OP_USHR); break;
case EXP_ASS_BITAND: cassignop(J, F, exp, OP_BITAND); break;
case EXP_ASS_BITXOR: cassignop(J, F, exp, OP_BITXOR); break;
case EXP_ASS_BITOR: cassignop(J, F, exp, OP_BITOR); break;
case EXP_COMMA:
cexp(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, OP_POP);
cexp(J, F, exp->b);
break;
case EXP_LOGOR:
cexp(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, OP_DUP);
end = emitjump(J, F, OP_JTRUE);
emit(J, F, OP_POP);
cexp(J, F, exp->b);
label(J, F, end);
break;
case EXP_LOGAND:
cexp(J, F, exp->a);
emitline(J, F, exp);
emit(J, F, OP_DUP);
end = emitjump(J, F, OP_JFALSE);
emit(J, F, OP_POP);
cexp(J, F, exp->b);
label(J, F, end);
break;
case EXP_COND:
cexp(J, F, exp->a);
emitline(J, F, exp);
then = emitjump(J, F, OP_JTRUE);
cexp(J, F, exp->c);
end = emitjump(J, F, OP_JUMP);
label(J, F, then);
cexp(J, F, exp->b);
label(J, F, end);
break;
default:
jsC_error(J, exp, "unknown expression type");
}
}
/* Patch break and continue statements */
static void addjump(JF, enum js_AstType type, js_Ast *target, int inst)
{
js_JumpList *jump = js_malloc(J, sizeof *jump);
jump->type = type;
jump->inst = inst;
jump->next = target->jumps;
target->jumps = jump;
}
static void labeljumps(JF, js_Ast *stm, int baddr, int caddr)
{
js_JumpList *jump = stm->jumps;
while (jump) {
js_JumpList *next = jump->next;
if (jump->type == STM_BREAK)
labelto(J, F, jump->inst, baddr);
if (jump->type == STM_CONTINUE)
labelto(J, F, jump->inst, caddr);
js_free(J, jump);
jump = next;
}
stm->jumps = NULL;
}
static int isloop(enum js_AstType T)
{
return T == STM_DO || T == STM_WHILE ||
T == STM_FOR || T == STM_FOR_VAR ||
T == STM_FOR_IN || T == STM_FOR_IN_VAR;
}
static int isfun(enum js_AstType T)
{
return T == AST_FUNDEC || T == EXP_FUN || T == EXP_PROP_GET || T == EXP_PROP_SET;
}
static int matchlabel(js_Ast *node, const char *label)
{
while (node && node->type == STM_LABEL) {
if (!strcmp(node->a->string, label))
return 1;
node = node->parent;
}
return 0;
}
static js_Ast *breaktarget(JF, js_Ast *node, const char *label)
{
while (node) {
if (isfun(node->type))
break;
if (!label) {
if (isloop(node->type) || node->type == STM_SWITCH)
return node;
} else {
if (matchlabel(node->parent, label))
return node;
}
node = node->parent;
}
return NULL;
}
static js_Ast *continuetarget(JF, js_Ast *node, const char *label)
{
while (node) {
if (isfun(node->type))
break;
if (isloop(node->type)) {
if (!label)
return node;
else if (matchlabel(node->parent, label))
return node;
}
node = node->parent;
}
return NULL;
}
static js_Ast *returntarget(JF, js_Ast *node)
{
while (node) {
if (isfun(node->type))
return node;
node = node->parent;
}
return NULL;
}
/* Emit code to rebalance stack and scopes during an abrupt exit */
static void cexit(JF, enum js_AstType T, js_Ast *node, js_Ast *target)
{
js_Ast *prev;
do {
prev = node, node = node->parent;
switch (node->type) {
default:
/* impossible */
break;
case STM_WITH:
emitline(J, F, node);
emit(J, F, OP_ENDWITH);
break;
case STM_FOR_IN:
case STM_FOR_IN_VAR:
emitline(J, F, node);
/* pop the iterator if leaving the loop */
if (F->script) {
if (T == STM_RETURN || T == STM_BREAK || (T == STM_CONTINUE && target != node)) {
/* pop the iterator, save the return or exp value */
emit(J, F, OP_ROT2);
emit(J, F, OP_POP);
}
if (T == STM_CONTINUE)
emit(J, F, OP_ROT2); /* put the iterator back on top */
} else {
if (T == STM_RETURN) {
/* pop the iterator, save the return value */
emit(J, F, OP_ROT2);
emit(J, F, OP_POP);
}
if (T == STM_BREAK || (T == STM_CONTINUE && target != node))
emit(J, F, OP_POP); /* pop the iterator */
}
break;
case STM_TRY:
emitline(J, F, node);
/* came from try block */
if (prev == node->a) {
emit(J, F, OP_ENDTRY);
if (node->d) cstm(J, F, node->d); /* finally */
}
/* came from catch block */
if (prev == node->c) {
/* ... with finally */
if (node->d) {
emit(J, F, OP_ENDCATCH);
emit(J, F, OP_ENDTRY);
cstm(J, F, node->d); /* finally */
} else {
emit(J, F, OP_ENDCATCH);
}
}
break;
}
} while (node != target);
}
/* Try/catch/finally */
static void ctryfinally(JF, js_Ast *trystm, js_Ast *finallystm)
{
int L1;
L1 = emitjump(J, F, OP_TRY);
{
/* if we get here, we have caught an exception in the try block */
cstm(J, F, finallystm); /* inline finally block */
emit(J, F, OP_THROW); /* rethrow exception */
}
label(J, F, L1);
cstm(J, F, trystm);
emit(J, F, OP_ENDTRY);
cstm(J, F, finallystm);
}
static void ctrycatch(JF, js_Ast *trystm, js_Ast *catchvar, js_Ast *catchstm)
{
int L1, L2;
L1 = emitjump(J, F, OP_TRY);
{
/* if we get here, we have caught an exception in the try block */
checkfutureword(J, F, catchvar);
if (F->strict) {
if (!strcmp(catchvar->string, "arguments"))
jsC_error(J, catchvar, "redefining 'arguments' is not allowed in strict mode");
if (!strcmp(catchvar->string, "eval"))
jsC_error(J, catchvar, "redefining 'eval' is not allowed in strict mode");
}
emitline(J, F, catchvar);
emitstring(J, F, OP_CATCH, catchvar->string);
cstm(J, F, catchstm);
emit(J, F, OP_ENDCATCH);
L2 = emitjump(J, F, OP_JUMP); /* skip past the try block */
}
label(J, F, L1);
cstm(J, F, trystm);
emit(J, F, OP_ENDTRY);
label(J, F, L2);
}
static void ctrycatchfinally(JF, js_Ast *trystm, js_Ast *catchvar, js_Ast *catchstm, js_Ast *finallystm)
{
int L1, L2, L3;
L1 = emitjump(J, F, OP_TRY);
{
/* if we get here, we have caught an exception in the try block */
L2 = emitjump(J, F, OP_TRY);
{
/* if we get here, we have caught an exception in the catch block */
cstm(J, F, finallystm); /* inline finally block */
emit(J, F, OP_THROW); /* rethrow exception */
}
label(J, F, L2);
if (F->strict) {
checkfutureword(J, F, catchvar);
if (!strcmp(catchvar->string, "arguments"))
jsC_error(J, catchvar, "redefining 'arguments' is not allowed in strict mode");
if (!strcmp(catchvar->string, "eval"))
jsC_error(J, catchvar, "redefining 'eval' is not allowed in strict mode");
}
emitline(J, F, catchvar);
emitstring(J, F, OP_CATCH, catchvar->string);
cstm(J, F, catchstm);
emit(J, F, OP_ENDCATCH);