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cosmopolitan/third_party/duktape/duk_bi_global.c

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/*
* Global object built-ins
*/
#include "third_party/duktape/duk_internal.h"
/*
* Encoding/decoding helpers
*/
/* XXX: Could add fast path (for each transform callback) with direct byte
* lookups (no shifting) and no explicit check for x < 0x80 before table
* lookup.
*/
/* Macros for creating and checking bitmasks for character encoding.
* Bit number is a bit counterintuitive, but minimizes code size.
*/
#define DUK__MKBITS(a, b, c, d, e, f, g, h) \
((duk_uint8_t)(((a) << 0) | ((b) << 1) | ((c) << 2) | ((d) << 3) | \
((e) << 4) | ((f) << 5) | ((g) << 6) | ((h) << 7)))
#define DUK__CHECK_BITMASK(table, cp) ((table)[(cp) >> 3] & (1u << ((cp)&0x07)))
/* E5.1 Section 15.1.3.3: uriReserved + uriUnescaped + '#' */
DUK_LOCAL const duk_uint8_t duk__encode_uriunescaped_table[16] = {
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */
DUK__MKBITS(0, 1, 0, 1, 1, 0, 1, 1),
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x20-0x2f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 1, 0, 1, 0, 1), /* 0x30-0x3f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x40-0x4f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 0, 0, 0, 0, 1), /* 0x50-0x5f */
DUK__MKBITS(0, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x60-0x6f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 0, 0, 0, 1, 0), /* 0x70-0x7f */
};
/* E5.1 Section 15.1.3.4: uriUnescaped */
DUK_LOCAL const duk_uint8_t duk__encode_uricomponent_unescaped_table[16] = {
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */
DUK__MKBITS(0, 1, 0, 0, 0, 0, 0, 1),
DUK__MKBITS(1, 1, 1, 0, 0, 1, 1, 0), /* 0x20-0x2f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 0, 0, 0, 0, 0, 0), /* 0x30-0x3f */
DUK__MKBITS(0, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x40-0x4f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 0, 0, 0, 0, 1), /* 0x50-0x5f */
DUK__MKBITS(0, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x60-0x6f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 0, 0, 0, 1, 0), /* 0x70-0x7f */
};
/* E5.1 Section 15.1.3.1: uriReserved + '#' */
DUK_LOCAL const duk_uint8_t duk__decode_uri_reserved_table[16] = {
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */
DUK__MKBITS(0, 0, 0, 1, 1, 0, 1, 0),
DUK__MKBITS(0, 0, 0, 1, 1, 0, 0, 1), /* 0x20-0x2f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 1, 1, 0, 1, 0, 1), /* 0x30-0x3f */
DUK__MKBITS(1, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x40-0x4f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x50-0x5f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x60-0x6f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x70-0x7f */
};
/* E5.1 Section 15.1.3.2: empty */
DUK_LOCAL const duk_uint8_t duk__decode_uri_component_reserved_table[16] = {
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x20-0x2f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x30-0x3f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x40-0x4f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x50-0x5f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x60-0x6f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x70-0x7f */
};
#if defined(DUK_USE_SECTION_B)
/* E5.1 Section B.2.2, step 7. */
DUK_LOCAL const duk_uint8_t duk__escape_unescaped_table[16] = {
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x00-0x0f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0), /* 0x10-0x1f */
DUK__MKBITS(0, 0, 0, 0, 0, 0, 0, 0),
DUK__MKBITS(0, 0, 1, 1, 0, 1, 1, 1), /* 0x20-0x2f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 0, 0, 0, 0, 0, 0), /* 0x30-0x3f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x40-0x4f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 0, 0, 0, 0, 1), /* 0x50-0x5f */
DUK__MKBITS(0, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1), /* 0x60-0x6f */
DUK__MKBITS(1, 1, 1, 1, 1, 1, 1, 1),
DUK__MKBITS(1, 1, 1, 0, 0, 0, 0, 0) /* 0x70-0x7f */
};
#endif /* DUK_USE_SECTION_B */
typedef struct {
duk_hthread *thr;
duk_hstring *h_str;
duk_bufwriter_ctx bw;
const duk_uint8_t *p;
const duk_uint8_t *p_start;
const duk_uint8_t *p_end;
} duk__transform_context;
typedef void (*duk__transform_callback)(duk__transform_context *tfm_ctx,
const void *udata, duk_codepoint_t cp);
/* XXX: refactor and share with other code */
DUK_LOCAL duk_small_int_t duk__decode_hex_escape(const duk_uint8_t *p,
duk_small_int_t n) {
duk_small_int_t ch;
duk_small_int_t t = 0;
while (n > 0) {
t = t * 16;
ch = (duk_small_int_t)duk_hex_dectab[*p++];
if (DUK_LIKELY(ch >= 0)) {
t += ch;
} else {
return -1;
}
n--;
}
return t;
}
DUK_LOCAL int duk__transform_helper(duk_hthread *thr,
duk__transform_callback callback,
const void *udata) {
duk__transform_context tfm_ctx_alloc;
duk__transform_context *tfm_ctx = &tfm_ctx_alloc;
duk_codepoint_t cp;
tfm_ctx->thr = thr;
tfm_ctx->h_str = duk_to_hstring(thr, 0);
DUK_ASSERT(tfm_ctx->h_str != NULL);
DUK_BW_INIT_PUSHBUF(
thr, &tfm_ctx->bw,
DUK_HSTRING_GET_BYTELEN(tfm_ctx->h_str)); /* initial size guess */
tfm_ctx->p_start = DUK_HSTRING_GET_DATA(tfm_ctx->h_str);
tfm_ctx->p_end = tfm_ctx->p_start + DUK_HSTRING_GET_BYTELEN(tfm_ctx->h_str);
tfm_ctx->p = tfm_ctx->p_start;
while (tfm_ctx->p < tfm_ctx->p_end) {
cp = (duk_codepoint_t)duk_unicode_decode_xutf8_checked(
thr, &tfm_ctx->p, tfm_ctx->p_start, tfm_ctx->p_end);
callback(tfm_ctx, udata, cp);
}
DUK_BW_COMPACT(thr, &tfm_ctx->bw);
(void)duk_buffer_to_string(thr, -1); /* Safe if transform is safe. */
return 1;
}
DUK_LOCAL void duk__transform_callback_encode_uri(
duk__transform_context *tfm_ctx, const void *udata, duk_codepoint_t cp) {
duk_uint8_t xutf8_buf[DUK_UNICODE_MAX_XUTF8_LENGTH];
duk_small_int_t len;
duk_codepoint_t cp1, cp2;
duk_small_int_t i, t;
const duk_uint8_t *unescaped_table = (const duk_uint8_t *)udata;
/* UTF-8 encoded bytes escaped as %xx%xx%xx... -> 3 * nbytes.
* Codepoint range is restricted so this is a slightly too large
* but doesn't matter.
*/
DUK_BW_ENSURE(tfm_ctx->thr, &tfm_ctx->bw, 3 * DUK_UNICODE_MAX_XUTF8_LENGTH);
if (cp < 0) {
goto uri_error;
} else if ((cp < 0x80L) && DUK__CHECK_BITMASK(unescaped_table, cp)) {
DUK_BW_WRITE_RAW_U8(tfm_ctx->thr, &tfm_ctx->bw, (duk_uint8_t)cp);
return;
} else if (cp >= 0xdc00L && cp <= 0xdfffL) {
goto uri_error;
} else if (cp >= 0xd800L && cp <= 0xdbffL) {
/* Needs lookahead */
if (duk_unicode_decode_xutf8(tfm_ctx->thr, &tfm_ctx->p, tfm_ctx->p_start,
tfm_ctx->p_end,
(duk_ucodepoint_t *)&cp2) == 0) {
goto uri_error;
}
if (!(cp2 >= 0xdc00L && cp2 <= 0xdfffL)) {
goto uri_error;
}
cp1 = cp;
cp =
(duk_codepoint_t)(((cp1 - 0xd800L) << 10) + (cp2 - 0xdc00L) + 0x10000L);
} else if (cp > 0x10ffffL) {
/* Although we can allow non-BMP characters (they'll decode
* back into surrogate pairs), we don't allow extended UTF-8
* characters; they would encode to URIs which won't decode
* back because of strict UTF-8 checks in URI decoding.
* (However, we could just as well allow them here.)
*/
goto uri_error;
} else {
/* Non-BMP characters within valid UTF-8 range: encode as is.
* They'll decode back into surrogate pairs if the escaped
* output is decoded.
*/
;
}
len = duk_unicode_encode_xutf8((duk_ucodepoint_t)cp, xutf8_buf);
for (i = 0; i < len; i++) {
t = (duk_small_int_t)xutf8_buf[i];
DUK_BW_WRITE_RAW_U8_3(tfm_ctx->thr, &tfm_ctx->bw, DUK_ASC_PERCENT,
(duk_uint8_t)duk_uc_nybbles[t >> 4],
(duk_uint8_t)duk_uc_nybbles[t & 0x0f]);
}
return;
uri_error:
DUK_ERROR_URI(tfm_ctx->thr, DUK_STR_INVALID_INPUT);
DUK_WO_NORETURN(return;);
}
DUK_LOCAL void duk__transform_callback_decode_uri(
duk__transform_context *tfm_ctx, const void *udata, duk_codepoint_t cp) {
const duk_uint8_t *reserved_table = (const duk_uint8_t *)udata;
duk_small_uint_t utf8_blen;
duk_codepoint_t min_cp;
duk_small_int_t t; /* must be signed */
duk_small_uint_t i;
/* Maximum write size: XUTF8 path writes max DUK_UNICODE_MAX_XUTF8_LENGTH,
* percent escape path writes max two times CESU-8 encoded BMP length.
*/
DUK_BW_ENSURE(
tfm_ctx->thr, &tfm_ctx->bw,
(DUK_UNICODE_MAX_XUTF8_LENGTH >= 2 * DUK_UNICODE_MAX_CESU8_BMP_LENGTH
? DUK_UNICODE_MAX_XUTF8_LENGTH
: DUK_UNICODE_MAX_CESU8_BMP_LENGTH));
if (cp == (duk_codepoint_t)'%') {
const duk_uint8_t *p = tfm_ctx->p;
duk_size_t left = (duk_size_t)(tfm_ctx->p_end - p); /* bytes left */
DUK_DDD(DUK_DDDPRINT("percent encoding, left=%ld", (long)left));
if (left < 2) {
goto uri_error;
}
t = duk__decode_hex_escape(p, 2);
DUK_DDD(DUK_DDDPRINT("first byte: %ld", (long)t));
if (t < 0) {
goto uri_error;
}
if (t < 0x80) {
if (DUK__CHECK_BITMASK(reserved_table, t)) {
/* decode '%xx' to '%xx' if decoded char in reserved set */
DUK_ASSERT(tfm_ctx->p - 1 >= tfm_ctx->p_start);
DUK_BW_WRITE_RAW_U8_3(tfm_ctx->thr, &tfm_ctx->bw, DUK_ASC_PERCENT, p[0],
p[1]);
} else {
DUK_BW_WRITE_RAW_U8(tfm_ctx->thr, &tfm_ctx->bw, (duk_uint8_t)t);
}
tfm_ctx->p += 2;
return;
}
/* Decode UTF-8 codepoint from a sequence of hex escapes. The
* first byte of the sequence has been decoded to 't'.
*
* Note that UTF-8 validation must be strict according to the
* specification: E5.1 Section 15.1.3, decode algorithm step
* 4.d.vii.8. URIError from non-shortest encodings is also
* specifically noted in the spec.
*/
DUK_ASSERT(t >= 0x80);
if (t < 0xc0) {
/* continuation byte */
goto uri_error;
} else if (t < 0xe0) {
/* 110x xxxx; 2 bytes */
utf8_blen = 2;
min_cp = 0x80L;
cp = t & 0x1f;
} else if (t < 0xf0) {
/* 1110 xxxx; 3 bytes */
utf8_blen = 3;
min_cp = 0x800L;
cp = t & 0x0f;
} else if (t < 0xf8) {
/* 1111 0xxx; 4 bytes */
utf8_blen = 4;
min_cp = 0x10000L;
cp = t & 0x07;
} else {
/* extended utf-8 not allowed for URIs */
goto uri_error;
}
if (left < utf8_blen * 3 - 1) {
/* '%xx%xx...%xx', p points to char after first '%' */
goto uri_error;
}
p += 3;
for (i = 1; i < utf8_blen; i++) {
/* p points to digit part ('%xy', p points to 'x') */
t = duk__decode_hex_escape(p, 2);
DUK_DDD(DUK_DDDPRINT("i=%ld utf8_blen=%ld cp=%ld t=0x%02lx", (long)i,
(long)utf8_blen, (long)cp, (unsigned long)t));
if (t < 0) {
goto uri_error;
}
if ((t & 0xc0) != 0x80) {
goto uri_error;
}
cp = (cp << 6) + (t & 0x3f);
p += 3;
}
p--; /* p overshoots */
tfm_ctx->p = p;
DUK_DDD(DUK_DDDPRINT("final cp=%ld, min_cp=%ld", (long)cp, (long)min_cp));
if (cp < min_cp || cp > 0x10ffffL || (cp >= 0xd800L && cp <= 0xdfffL)) {
goto uri_error;
}
/* The E5.1 algorithm checks whether or not a decoded codepoint
* is below 0x80 and perhaps may be in the "reserved" set.
* This seems pointless because the single byte UTF-8 case is
* handled separately, and non-shortest encodings are rejected.
* So, 'cp' cannot be below 0x80 here, and thus cannot be in
* the reserved set.
*/
/* utf-8 validation ensures these */
DUK_ASSERT(cp >= 0x80L && cp <= 0x10ffffL);
if (cp >= 0x10000L) {
cp -= 0x10000L;
DUK_ASSERT(cp < 0x100000L);
DUK_BW_WRITE_RAW_XUTF8(tfm_ctx->thr, &tfm_ctx->bw,
((cp >> 10) + 0xd800L));
DUK_BW_WRITE_RAW_XUTF8(tfm_ctx->thr, &tfm_ctx->bw,
((cp & 0x03ffL) + 0xdc00L));
} else {
DUK_BW_WRITE_RAW_XUTF8(tfm_ctx->thr, &tfm_ctx->bw, cp);
}
} else {
DUK_BW_WRITE_RAW_XUTF8(tfm_ctx->thr, &tfm_ctx->bw, cp);
}
return;
uri_error:
DUK_ERROR_URI(tfm_ctx->thr, DUK_STR_INVALID_INPUT);
DUK_WO_NORETURN(return;);
}
#if defined(DUK_USE_SECTION_B)
DUK_LOCAL void duk__transform_callback_escape(duk__transform_context *tfm_ctx,
const void *udata,
duk_codepoint_t cp) {
DUK_UNREF(udata);
DUK_BW_ENSURE(tfm_ctx->thr, &tfm_ctx->bw, 6);
if (cp < 0) {
goto esc_error;
} else if ((cp < 0x80L) &&
DUK__CHECK_BITMASK(duk__escape_unescaped_table, cp)) {
DUK_BW_WRITE_RAW_U8(tfm_ctx->thr, &tfm_ctx->bw, (duk_uint8_t)cp);
} else if (cp < 0x100L) {
DUK_BW_WRITE_RAW_U8_3(tfm_ctx->thr, &tfm_ctx->bw,
(duk_uint8_t)DUK_ASC_PERCENT,
(duk_uint8_t)duk_uc_nybbles[cp >> 4],
(duk_uint8_t)duk_uc_nybbles[cp & 0x0f]);
} else if (cp < 0x10000L) {
DUK_BW_WRITE_RAW_U8_6(
tfm_ctx->thr, &tfm_ctx->bw, (duk_uint8_t)DUK_ASC_PERCENT,
(duk_uint8_t)DUK_ASC_LC_U, (duk_uint8_t)duk_uc_nybbles[cp >> 12],
(duk_uint8_t)duk_uc_nybbles[(cp >> 8) & 0x0f],
(duk_uint8_t)duk_uc_nybbles[(cp >> 4) & 0x0f],
(duk_uint8_t)duk_uc_nybbles[cp & 0x0f]);
} else {
/* Characters outside BMP cannot be escape()'d. We could
* encode them as surrogate pairs (for codepoints inside
* valid UTF-8 range, but not extended UTF-8). Because
* escape() and unescape() are legacy functions, we don't.
*/
goto esc_error;
}
return;
esc_error:
DUK_ERROR_TYPE(tfm_ctx->thr, DUK_STR_INVALID_INPUT);
DUK_WO_NORETURN(return;);
}
DUK_LOCAL void duk__transform_callback_unescape(duk__transform_context *tfm_ctx,
const void *udata,
duk_codepoint_t cp) {
duk_small_int_t t;
DUK_UNREF(udata);
if (cp == (duk_codepoint_t)'%') {
const duk_uint8_t *p = tfm_ctx->p;
duk_size_t left = (duk_size_t)(tfm_ctx->p_end - p); /* bytes left */
if (left >= 5 && p[0] == 'u' &&
((t = duk__decode_hex_escape(p + 1, 4)) >= 0)) {
cp = (duk_codepoint_t)t;
tfm_ctx->p += 5;
} else if (left >= 2 && ((t = duk__decode_hex_escape(p, 2)) >= 0)) {
cp = (duk_codepoint_t)t;
tfm_ctx->p += 2;
}
}
DUK_BW_WRITE_ENSURE_XUTF8(tfm_ctx->thr, &tfm_ctx->bw, cp);
}
#endif /* DUK_USE_SECTION_B */
/*
* Eval
*
* Eval needs to handle both a "direct eval" and an "indirect eval".
* Direct eval handling needs access to the caller's activation so that its
* lexical environment can be accessed. A direct eval is only possible from
* ECMAScript code; an indirect eval call is possible also from C code.
* When an indirect eval call is made from C code, there may not be a
* calling activation at all which needs careful handling.
*/
DUK_INTERNAL duk_ret_t duk_bi_global_object_eval(duk_hthread *thr) {
duk_hstring *h;
duk_activation *act_caller;
duk_activation *act_eval;
duk_hcompfunc *func;
duk_hobject *outer_lex_env;
duk_hobject *outer_var_env;
duk_bool_t this_to_global = 1;
duk_small_uint_t comp_flags;
duk_int_t level = -2;
duk_small_uint_t call_flags;
DUK_ASSERT(duk_get_top(thr) == 1 ||
duk_get_top(thr) == 2); /* 2 when called by debugger */
DUK_ASSERT(thr->callstack_top >= 1); /* at least this function exists */
DUK_ASSERT(thr->callstack_curr != NULL);
DUK_ASSERT((thr->callstack_curr->flags & DUK_ACT_FLAG_DIRECT_EVAL) ==
0 || /* indirect eval */
(thr->callstack_top >=
2)); /* if direct eval, calling activation must exist */
/*
* callstack_top - 1 --> this function
* callstack_top - 2 --> caller (may not exist)
*
* If called directly from C, callstack_top might be 1. If calling
* activation doesn't exist, call must be indirect.
*/
h = duk_get_hstring_notsymbol(thr, 0);
if (!h) {
/* Symbol must be returned as is, like any non-string values. */
return 1; /* return arg as-is */
}
#if defined(DUK_USE_DEBUGGER_SUPPORT)
/* NOTE: level is used only by the debugger and should never be present
* for an ECMAScript eval().
*/
DUK_ASSERT(level == -2); /* by default, use caller's environment */
if (duk_get_top(thr) >= 2 && duk_is_number(thr, 1)) {
level = duk_get_int(thr, 1);
}
DUK_ASSERT(level <= -2); /* This is guaranteed by debugger code. */
#endif
/* [ source ] */
comp_flags = DUK_COMPILE_EVAL;
act_eval = thr->callstack_curr; /* this function */
DUK_ASSERT(act_eval != NULL);
act_caller = duk_hthread_get_activation_for_level(thr, level);
if (act_caller != NULL) {
/* Have a calling activation, check for direct eval (otherwise
* assume indirect eval.
*/
if ((act_caller->flags & DUK_ACT_FLAG_STRICT) &&
(act_eval->flags & DUK_ACT_FLAG_DIRECT_EVAL)) {
/* Only direct eval inherits strictness from calling code
* (E5.1 Section 10.1.1).
*/
comp_flags |= DUK_COMPILE_STRICT;
}
} else {
DUK_ASSERT((act_eval->flags & DUK_ACT_FLAG_DIRECT_EVAL) == 0);
}
duk_push_hstring_stridx(thr, DUK_STRIDX_INPUT); /* XXX: copy from caller? */
duk_js_compile(thr, (const duk_uint8_t *)DUK_HSTRING_GET_DATA(h),
(duk_size_t)DUK_HSTRING_GET_BYTELEN(h), comp_flags);
func = (duk_hcompfunc *)duk_known_hobject(thr, -1);
DUK_ASSERT(DUK_HOBJECT_IS_COMPFUNC((duk_hobject *)func));
/* [ source template ] */
/* E5 Section 10.4.2 */
if (act_eval->flags & DUK_ACT_FLAG_DIRECT_EVAL) {
DUK_ASSERT(thr->callstack_top >= 2);
DUK_ASSERT(act_caller != NULL);
if (act_caller->lex_env == NULL) {
DUK_ASSERT(act_caller->var_env == NULL);
DUK_DDD(DUK_DDDPRINT("delayed environment initialization"));
/* this may have side effects, so re-lookup act */
duk_js_init_activation_environment_records_delayed(thr, act_caller);
}
DUK_ASSERT(act_caller->lex_env != NULL);
DUK_ASSERT(act_caller->var_env != NULL);
this_to_global = 0;
if (DUK_HOBJECT_HAS_STRICT((duk_hobject *)func)) {
duk_hdecenv *new_env;
duk_hobject *act_lex_env;
DUK_DDD(DUK_DDDPRINT("direct eval call to a strict function -> "
"var_env and lex_env to a fresh env, "
"this_binding to caller's this_binding"));
act_lex_env = act_caller->lex_env;
new_env = duk_hdecenv_alloc(
thr, DUK_HOBJECT_FLAG_EXTENSIBLE |
DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DECENV));
DUK_ASSERT(new_env != NULL);
duk_push_hobject(thr, (duk_hobject *)new_env);
DUK_ASSERT(DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *)new_env) ==
NULL);
DUK_HOBJECT_SET_PROTOTYPE(thr->heap, (duk_hobject *)new_env, act_lex_env);
DUK_HOBJECT_INCREF_ALLOWNULL(thr, act_lex_env);
DUK_DDD(DUK_DDDPRINT("new_env allocated: %!iO", (duk_heaphdr *)new_env));
outer_lex_env = (duk_hobject *)new_env;
outer_var_env = (duk_hobject *)new_env;
duk_insert(thr, 0); /* stash to bottom of value stack to keep new_env
reachable for duration of eval */
/* compiler's responsibility */
DUK_ASSERT(DUK_HOBJECT_HAS_NEWENV((duk_hobject *)func));
} else {
DUK_DDD(DUK_DDDPRINT("direct eval call to a non-strict function -> "
"var_env and lex_env to caller's envs, "
"this_binding to caller's this_binding"));
outer_lex_env = act_caller->lex_env;
outer_var_env = act_caller->var_env;
/* compiler's responsibility */
DUK_ASSERT(!DUK_HOBJECT_HAS_NEWENV((duk_hobject *)func));
}
} else {
DUK_DDD(DUK_DDDPRINT("indirect eval call -> var_env and lex_env to "
"global object, this_binding to global object"));
this_to_global = 1;
outer_lex_env = thr->builtins[DUK_BIDX_GLOBAL_ENV];
outer_var_env = thr->builtins[DUK_BIDX_GLOBAL_ENV];
}
/* Eval code doesn't need an automatic .prototype object. */
duk_js_push_closure(thr, func, outer_var_env, outer_lex_env,
0 /*add_auto_proto*/);
/* [ env? source template closure ] */
if (this_to_global) {
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
duk_push_hobject_bidx(thr, DUK_BIDX_GLOBAL);
} else {
duk_tval *tv;
DUK_ASSERT(thr->callstack_top >= 2);
DUK_ASSERT(act_caller != NULL);
tv = (duk_tval *)(void *)((duk_uint8_t *)thr->valstack +
act_caller->bottom_byteoff -
sizeof(
duk_tval)); /* this is just beneath bottom */
DUK_ASSERT(tv >= thr->valstack);
duk_push_tval(thr, tv);
}
DUK_DDD(DUK_DDDPRINT("eval -> lex_env=%!iO, var_env=%!iO, this_binding=%!T",
(duk_heaphdr *)outer_lex_env,
(duk_heaphdr *)outer_var_env, duk_get_tval(thr, -1)));
/* [ env? source template closure this ] */
call_flags = 0;
if (act_eval->flags & DUK_ACT_FLAG_DIRECT_EVAL) {
/* Set DIRECT_EVAL flag for the call; it's not strictly
* needed for the 'inner' eval call (the eval body) but
* current new.target implementation expects to find it
* so it can traverse direct eval chains up to the real
* calling function.
*/
call_flags |= DUK_CALL_FLAG_DIRECT_EVAL;
}
duk_handle_call_unprotected_nargs(thr, 0, call_flags);
/* [ env? source template result ] */
return 1;
}
/*
* Parsing of ints and floats
*/
#if defined(DUK_USE_GLOBAL_BUILTIN)
DUK_INTERNAL duk_ret_t duk_bi_global_object_parse_int(duk_hthread *thr) {
duk_int32_t radix;
duk_small_uint_t s2n_flags;
DUK_ASSERT_TOP(thr, 2);
duk_to_string(thr, 0); /* Reject symbols. */
radix = duk_to_int32(thr, 1);
/* While parseInt() recognizes 0xdeadbeef, it doesn't recognize
* ES2015 0o123 or 0b10001.
*/
s2n_flags = DUK_S2N_FLAG_TRIM_WHITE | DUK_S2N_FLAG_ALLOW_GARBAGE |
DUK_S2N_FLAG_ALLOW_PLUS | DUK_S2N_FLAG_ALLOW_MINUS |
DUK_S2N_FLAG_ALLOW_LEADING_ZERO | DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT;
/* Specification stripPrefix maps to DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT.
*
* Don't autodetect octals (from leading zeroes), require user code to
* provide an explicit radix 8 for parsing octal. See write-up from Mozilla:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt#ECMAScript_5_Removes_Octal_Interpretation
*/
if (radix != 0) {
if (radix < 2 || radix > 36) {
goto ret_nan;
}
if (radix != 16) {
s2n_flags &= ~DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT;
}
} else {
radix = 10;
}
duk_dup_0(thr);
duk_numconv_parse(thr, (duk_small_int_t)radix, s2n_flags);
return 1;
ret_nan:
duk_push_nan(thr);
return 1;
}
#endif /* DUK_USE_GLOBAL_BUILTIN */
#if defined(DUK_USE_GLOBAL_BUILTIN)
DUK_INTERNAL duk_ret_t duk_bi_global_object_parse_float(duk_hthread *thr) {
duk_small_uint_t s2n_flags;
DUK_ASSERT_TOP(thr, 1);
duk_to_string(thr, 0); /* Reject symbols. */
/* XXX: check flags */
s2n_flags = DUK_S2N_FLAG_TRIM_WHITE | DUK_S2N_FLAG_ALLOW_EXP |
DUK_S2N_FLAG_ALLOW_GARBAGE | DUK_S2N_FLAG_ALLOW_PLUS |
DUK_S2N_FLAG_ALLOW_MINUS | DUK_S2N_FLAG_ALLOW_INF |
DUK_S2N_FLAG_ALLOW_FRAC | DUK_S2N_FLAG_ALLOW_NAKED_FRAC |
DUK_S2N_FLAG_ALLOW_EMPTY_FRAC | DUK_S2N_FLAG_ALLOW_LEADING_ZERO;
duk_numconv_parse(thr, 10 /*radix*/, s2n_flags);
return 1;
}
#endif /* DUK_USE_GLOBAL_BUILTIN */
/*
* Number checkers
*/
#if defined(DUK_USE_GLOBAL_BUILTIN)
DUK_INTERNAL duk_ret_t duk_bi_global_object_is_nan(duk_hthread *thr) {
duk_double_t d = duk_to_number(thr, 0);
duk_push_boolean(thr, (duk_bool_t)DUK_ISNAN(d));
return 1;
}
#endif /* DUK_USE_GLOBAL_BUILTIN */
#if defined(DUK_USE_GLOBAL_BUILTIN)
DUK_INTERNAL duk_ret_t duk_bi_global_object_is_finite(duk_hthread *thr) {
duk_double_t d = duk_to_number(thr, 0);
duk_push_boolean(thr, (duk_bool_t)DUK_ISFINITE(d));
return 1;
}
#endif /* DUK_USE_GLOBAL_BUILTIN */
/*
* URI handling
*/
#if defined(DUK_USE_GLOBAL_BUILTIN)
DUK_INTERNAL duk_ret_t duk_bi_global_object_decode_uri(duk_hthread *thr) {
return duk__transform_helper(thr, duk__transform_callback_decode_uri,
(const void *)duk__decode_uri_reserved_table);
}
DUK_INTERNAL duk_ret_t
duk_bi_global_object_decode_uri_component(duk_hthread *thr) {
return duk__transform_helper(
thr, duk__transform_callback_decode_uri,
(const void *)duk__decode_uri_component_reserved_table);
}
DUK_INTERNAL duk_ret_t duk_bi_global_object_encode_uri(duk_hthread *thr) {
return duk__transform_helper(thr, duk__transform_callback_encode_uri,
(const void *)duk__encode_uriunescaped_table);
}
DUK_INTERNAL duk_ret_t
duk_bi_global_object_encode_uri_component(duk_hthread *thr) {
return duk__transform_helper(
thr, duk__transform_callback_encode_uri,
(const void *)duk__encode_uricomponent_unescaped_table);
}
#if defined(DUK_USE_SECTION_B)
DUK_INTERNAL duk_ret_t duk_bi_global_object_escape(duk_hthread *thr) {
return duk__transform_helper(thr, duk__transform_callback_escape,
(const void *)NULL);
}
DUK_INTERNAL duk_ret_t duk_bi_global_object_unescape(duk_hthread *thr) {
return duk__transform_helper(thr, duk__transform_callback_unescape,
(const void *)NULL);
}
#endif /* DUK_USE_SECTION_B */
#endif /* DUK_USE_GLOBAL_BUILTIN */
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