[X2Go-Commits] [pale-moon] 05/294: Stage 1-3: Generate better source in Object.prototype.toSource.
git-admin at x2go.org
git-admin at x2go.org
Sat Apr 27 08:57:40 CEST 2019
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x2go pushed a commit to branch upstream/28.5.0
in repository pale-moon.
commit 90f6b2704658a554a12ed3c37545cb6474fbcf51
Author: wolfbeast <mcwerewolf at wolfbeast.com>
Date: Sat Feb 2 14:29:54 2019 +0100
Stage 1-3: Generate better source in Object.prototype.toSource.
Tag #960.
---
js/src/builtin/Object.cpp | 280 ++++++++++++++++++++++++++++++++--------------
1 file changed, 193 insertions(+), 87 deletions(-)
diff --git a/js/src/builtin/Object.cpp b/js/src/builtin/Object.cpp
index cd4ac12..389bb57 100644
--- a/js/src/builtin/Object.cpp
+++ b/js/src/builtin/Object.cpp
@@ -9,11 +9,13 @@
#include "mozilla/ArrayUtils.h"
#include "jscntxt.h"
+#include "jsstr.h"
#include "builtin/Eval.h"
#include "frontend/BytecodeCompiler.h"
#include "jit/InlinableNatives.h"
#include "js/UniquePtr.h"
+#include "vm/AsyncFunction.h"
#include "vm/StringBuffer.h"
#include "jsobjinlines.h"
@@ -124,6 +126,27 @@ obj_toSource(JSContext* cx, unsigned argc, Value* vp)
return true;
}
+template <typename CharT>
+static bool
+Consume(const CharT*& s, const CharT* e, const char *chars)
+{
+ size_t len = strlen(chars);
+ if (s + len >= e)
+ return false;
+ if (!EqualChars(s, chars, len))
+ return false;
+ s += len;
+ return true;
+}
+
+template <typename CharT>
+static void
+ConsumeSpaces(const CharT*& s, const CharT* e)
+{
+ while (*s == ' ' && s < e)
+ s++;
+}
+
/*
* Given a function source string, return the offset and length of the part
* between '(function $name' and ')'.
@@ -133,37 +156,53 @@ static bool
ArgsAndBodySubstring(mozilla::Range<const CharT> chars, size_t* outOffset, size_t* outLen)
{
const CharT* const start = chars.begin().get();
- const CharT* const end = chars.end().get();
const CharT* s = start;
+ const CharT* e = chars.end().get();
- uint8_t parenChomp = 0;
- if (s[0] == '(') {
- s++;
- parenChomp = 1;
- }
-
- /* Try to jump "function" keyword. */
- s = js_strchr_limit(s, ' ', end);
- if (!s)
+ if (s == e)
return false;
- /*
- * Jump over the function's name: it can't be encoded as part
- * of an ECMA getter or setter.
- */
- s = js_strchr_limit(s, '(', end);
- if (!s)
- return false;
+ // Remove enclosing parentheses.
+ if (*s == '(' && *(e - 1) == ')') {
+ s++;
+ e--;
+ }
- if (*s == ' ')
+ (void) Consume(s, e, "async");
+ ConsumeSpaces(s, e);
+ (void) (Consume(s, e, "function") || Consume(s, e, "get") || Consume(s, e, "set"));
+ ConsumeSpaces(s, e);
+ (void) Consume(s, e, "*");
+ ConsumeSpaces(s, e);
+
+ // Jump over the function's name.
+ if (Consume(s, e, "[")) {
+ s = js_strchr_limit(s, ']', e);
+ if (!s)
+ return false;
s++;
+ ConsumeSpaces(s, e);
+ if (*s != '(')
+ return false;
+ } else {
+ s = js_strchr_limit(s, '(', e);
+ if (!s)
+ return false;
+ }
*outOffset = s - start;
- *outLen = end - s - parenChomp;
+ *outLen = e - s;
MOZ_ASSERT(*outOffset + *outLen <= chars.length());
return true;
}
+enum class PropertyKind {
+ Getter,
+ Setter,
+ Method,
+ Normal
+};
+
JSString*
js::ObjectToSource(JSContext* cx, HandleObject obj)
{
@@ -182,59 +221,28 @@ js::ObjectToSource(JSContext* cx, HandleObject obj)
if (!buf.append('{'))
return nullptr;
- RootedValue v0(cx), v1(cx);
- MutableHandleValue val[2] = {&v0, &v1};
-
- RootedString str0(cx), str1(cx);
- MutableHandleString gsop[2] = {&str0, &str1};
-
AutoIdVector idv(cx);
if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY | JSITER_SYMBOLS, &idv))
return nullptr;
bool comma = false;
- for (size_t i = 0; i < idv.length(); ++i) {
- RootedId id(cx, idv[i]);
- Rooted<PropertyDescriptor> desc(cx);
- if (!GetOwnPropertyDescriptor(cx, obj, id, &desc))
- return nullptr;
-
- int valcnt = 0;
- if (desc.object()) {
- if (desc.isAccessorDescriptor()) {
- if (desc.hasGetterObject() && desc.getterObject()) {
- val[valcnt].setObject(*desc.getterObject());
- gsop[valcnt].set(cx->names().get);
- valcnt++;
- }
- if (desc.hasSetterObject() && desc.setterObject()) {
- val[valcnt].setObject(*desc.setterObject());
- gsop[valcnt].set(cx->names().set);
- valcnt++;
- }
- } else {
- valcnt = 1;
- val[0].set(desc.value());
- gsop[0].set(nullptr);
- }
- }
-
+ auto AddProperty = [cx, &comma, &buf](HandleId id, HandleValue val, PropertyKind kind) -> bool {
/* Convert id to a string. */
RootedString idstr(cx);
if (JSID_IS_SYMBOL(id)) {
RootedValue v(cx, SymbolValue(JSID_TO_SYMBOL(id)));
idstr = ValueToSource(cx, v);
if (!idstr)
- return nullptr;
+ return false;
} else {
RootedValue idv(cx, IdToValue(id));
idstr = ToString<CanGC>(cx, idv);
if (!idstr)
- return nullptr;
+ return false;
/*
- * If id is a string that's not an identifier, or if it's a negative
- * integer, then it must be quoted.
+ * If id is a string that's not an identifier, or if it's a
+ * negative integer, then it must be quoted.
*/
if (JSID_IS_ATOM(id)
? !IsIdentifier(JSID_TO_ATOM(id))
@@ -242,28 +250,65 @@ js::ObjectToSource(JSContext* cx, HandleObject obj)
{
idstr = QuoteString(cx, idstr, char16_t('\''));
if (!idstr)
- return nullptr;
+ return false;
}
}
- for (int j = 0; j < valcnt; j++) {
- /* Convert val[j] to its canonical source form. */
- JSString* valsource = ValueToSource(cx, val[j]);
- if (!valsource)
- return nullptr;
+ RootedString valsource(cx, ValueToSource(cx, val));
+ if (!valsource)
+ return false;
- RootedLinearString valstr(cx, valsource->ensureLinear(cx));
- if (!valstr)
- return nullptr;
+ RootedLinearString valstr(cx, valsource->ensureLinear(cx));
+ if (!valstr)
+ return false;
+
+ if (comma && !buf.append(", "))
+ return false;
+ comma = true;
+
+ size_t voffset, vlength;
+
+ // Methods and accessors can return exact syntax of source, that fits
+ // into property without adding property name or "get"/"set" prefix.
+ // Use the exact syntax when the following conditions are met:
+ //
+ // * It's a function object
+ // (exclude proxies)
+ // * Function's kind and property's kind are same
+ // (this can be false for dynamically defined properties)
+ // * Function has explicit name
+ // (this can be false for computed property and dynamically defined
+ // properties)
+ // * Function's name and property's name are same
+ // (this can be false for dynamically defined properties)
+ if (kind == PropertyKind::Getter || kind == PropertyKind::Setter ||
+ kind == PropertyKind::Method)
+ {
+ RootedFunction fun(cx);
+ if (val.toObject().is<JSFunction>()) {
+ fun = &val.toObject().as<JSFunction>();
+ // Method's case should be checked on caller.
+ if (((fun->isGetter() && kind == PropertyKind::Getter) ||
+ (fun->isSetter() && kind == PropertyKind::Setter) ||
+ kind == PropertyKind::Method) &&
+ fun->explicitName())
+ {
+ bool result;
+ if (!EqualStrings(cx, fun->explicitName(), idstr, &result))
+ return false;
- size_t voffset = 0;
- size_t vlength = valstr->length();
+ if (result) {
+ if (!buf.append(valstr))
+ return false;
+ return true;
+ }
+ }
+ }
- /*
- * Remove '(function ' from the beginning of valstr and ')' from the
- * end so that we can put "get" in front of the function definition.
- */
- if (gsop[j] && IsFunctionObject(val[j])) {
+ {
+ // When falling back try to generate a better string
+ // representation by skipping the prelude, and also removing
+ // the enclosing parentheses.
bool success;
JS::AutoCheckCannotGC nogc;
if (valstr->hasLatin1Chars())
@@ -271,29 +316,90 @@ js::ObjectToSource(JSContext* cx, HandleObject obj)
else
success = ArgsAndBodySubstring(valstr->twoByteRange(nogc), &voffset, &vlength);
if (!success)
- gsop[j].set(nullptr);
+ kind = PropertyKind::Normal;
}
- if (comma && !buf.append(", "))
- return nullptr;
- comma = true;
+ if (kind == PropertyKind::Getter) {
+ if (!buf.append("get "))
+ return false;
+ } else if (kind == PropertyKind::Setter) {
+ if (!buf.append("set "))
+ return false;
+ } else if (kind == PropertyKind::Method && fun) {
+ if (IsWrappedAsyncFunction(fun)) {
+ if (!buf.append("async "))
+ return false;
+ }
- if (gsop[j]) {
- if (!buf.append(gsop[j]) || !buf.append(' '))
- return nullptr;
+ if (fun->isStarGenerator()) {
+ if (!buf.append('*'))
+ return false;
+ }
}
- if (JSID_IS_SYMBOL(id) && !buf.append('['))
- return nullptr;
- if (!buf.append(idstr))
- return nullptr;
- if (JSID_IS_SYMBOL(id) && !buf.append(']'))
- return nullptr;
- if (!buf.append(gsop[j] ? ' ' : ':'))
- return nullptr;
+ }
+ bool needsBracket = JSID_IS_SYMBOL(id);
+ if (needsBracket && !buf.append('['))
+ return false;
+ if (!buf.append(idstr))
+ return false;
+ if (needsBracket && !buf.append(']'))
+ return false;
+
+ if (kind == PropertyKind::Getter || kind == PropertyKind::Setter ||
+ kind == PropertyKind::Method)
+ {
if (!buf.appendSubstring(valstr, voffset, vlength))
- return nullptr;
+ return false;
+ } else {
+ if (!buf.append(':'))
+ return false;
+ if (!buf.append(valstr))
+ return false;
+ }
+ return true;
+ };
+
+ RootedId id(cx);
+ Rooted<PropertyDescriptor> desc(cx);
+ RootedValue val(cx);
+ RootedFunction fun(cx);
+ for (size_t i = 0; i < idv.length(); ++i) {
+ id = idv[i];
+ if (!GetOwnPropertyDescriptor(cx, obj, id, &desc))
+ return nullptr;
+
+ if (!desc.object())
+ continue;
+
+ if (desc.isAccessorDescriptor()) {
+ if (desc.hasGetterObject() && desc.getterObject()) {
+ val.setObject(*desc.getterObject());
+ if (!AddProperty(id, val, PropertyKind::Getter))
+ return nullptr;
+ }
+ if (desc.hasSetterObject() && desc.setterObject()) {
+ val.setObject(*desc.setterObject());
+ if (!AddProperty(id, val, PropertyKind::Setter))
+ return nullptr;
+ }
+ continue;
}
+
+ val.set(desc.value());
+ if (IsFunctionObject(val, fun.address())) {
+ if (IsWrappedAsyncFunction(fun))
+ fun = GetUnwrappedAsyncFunction(fun);
+
+ if (fun->isMethod()) {
+ if (!AddProperty(id, val, PropertyKind::Method))
+ return nullptr;
+ continue;
+ }
+ }
+
+ if (!AddProperty(id, val, PropertyKind::Normal))
+ return nullptr;
}
if (!buf.append('}'))
--
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