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[CSA] Adapt arguments to be accessed in the reversed order

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Bug: v8:10201
Change-Id: I2271602b2da6fd06038ddfab16090d7faac592ca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2074218
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66593}
This commit is contained in:
Victor Gomes 2020-03-05 13:47:13 +01:00 committed by Commit Bot
parent c0c3b20782
commit f0bfa9ea1a
1 changed files with 20 additions and 6 deletions
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26
src/codegen/code-stub-assembler.cc
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@ -12526,10 +12526,18 @@ CodeStubArguments::CodeStubArguments(CodeStubAssembler* assembler,
argc_(argc),
base_(),
fp_(fp != nullptr ? fp : assembler_->LoadFramePointer()) {
#ifdef V8_REVERSE_JSARGS
TNode<IntPtrT> offset = assembler_->IntPtrConstant(
(StandardFrameConstants::kFixedSlotCountAboveFp + 1) *
kSystemPointerSize);
#else
TNode<IntPtrT> offset = assembler_->ElementOffsetFromIndex(
argc_, SYSTEM_POINTER_ELEMENTS,
(StandardFrameConstants::kFixedSlotCountAboveFp - 1) *
kSystemPointerSize);
#endif
// base_ points to the first argument, not the receiver
// whether present or not.
base_ = assembler_->RawPtrAdd(fp_, offset);
}
@ -12546,10 +12554,14 @@ void CodeStubArguments::SetReceiver(TNode<Object> object) const {
}
TNode<RawPtrT> CodeStubArguments::AtIndexPtr(TNode<IntPtrT> index) const {
#ifdef V8_REVERSE_JSARGS
TNode<IntPtrT> offset = index;
#else
TNode<IntPtrT> negated_index =
assembler_->IntPtrOrSmiSub(assembler_->IntPtrConstant(0), index);
TNode<IntPtrT> offset = assembler_->ElementOffsetFromIndex(
negated_index, SYSTEM_POINTER_ELEMENTS, 0);
#endif
return assembler_->RawPtrAdd(base_, offset);
}
@ -12613,18 +12625,20 @@ void CodeStubArguments::ForEach(
if (last == nullptr) {
last = argc_;
}
TNode<RawPtrT> start = assembler_->RawPtrSub(
base_,
assembler_->ElementOffsetFromIndex(first, SYSTEM_POINTER_ELEMENTS));
TNode<RawPtrT> end = assembler_->RawPtrSub(
base_, assembler_->ElementOffsetFromIndex(last, SYSTEM_POINTER_ELEMENTS));
TNode<RawPtrT> start = AtIndexPtr(first);
TNode<RawPtrT> end = AtIndexPtr(last);
#ifdef V8_REVERSE_JSARGS
const int increment = kSystemPointerSize;
#else
const int increment = -kSystemPointerSize;
#endif
assembler_->BuildFastLoop<RawPtrT>(
vars, start, end,
[&](TNode<RawPtrT> current) {
TNode<Object> arg = assembler_->Load<Object>(current);
body(arg);
},
-kSystemPointerSize, CodeStubAssembler::IndexAdvanceMode::kPost);
increment, CodeStubAssembler::IndexAdvanceMode::kPost);
}
void CodeStubArguments::PopAndReturn(TNode<Object> value) {