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Bug 1472031 - Implement a SourceUnits::remaining() function exposing how many code units are left. r=arai

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--HG--
extra : rebase_source : a0e1e6add04478f6dda4407943772683f77fad24
This commit is contained in:
Jeff Walden 2018-06-28 15:34:12 -07:00
parent 4ec8af2179
commit 75148cb5d5
1 changed files with 8 additions and 3 deletions
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11
js/src/frontend/TokenStream.h
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@ -946,6 +946,11 @@ class SourceUnits
return ptr >= limit_;
}
size_t remaining() const {
MOZ_ASSERT(ptr, "can't get a count of remaining code units if poisoned");
return mozilla::PointerRangeSize(ptr, limit_);
}
size_t startOffset() const {
return startOffset_;
}
@ -980,7 +985,7 @@ class SourceUnits
bool peekCodeUnits(uint8_t n, CharT* out) const {
MOZ_ASSERT(ptr, "shouldn't peek into poisoned SourceUnits");
if (n > mozilla::PointerRangeSize(ptr, limit_))
if (n > remaining())
return false;
std::copy_n(ptr, n, out);
@ -989,7 +994,7 @@ class SourceUnits
void skipCodeUnits(uint32_t n) {
MOZ_ASSERT(ptr, "shouldn't use poisoned SourceUnits");
MOZ_ASSERT(n <= mozilla::PointerRangeSize(ptr, limit_),
MOZ_ASSERT(n <= remaining(),
"shouldn't skip beyond end of SourceUnits");
ptr += n;
}
@ -997,7 +1002,7 @@ class SourceUnits
void unskipCodeUnits(uint32_t n) {
MOZ_ASSERT(ptr, "shouldn't use poisoned SourceUnits");
MOZ_ASSERT(n <= mozilla::PointerRangeSize(base_, ptr),
"shouldn't skip beyond start of SourceUnits");
"shouldn't unskip beyond start of SourceUnits");
ptr -= n;
}