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[PyTorch] Store Tensor explicitly in IValue #48824

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[PyTorch] Store Tensor explicitly in IValue #48824

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b48bbb4
[PyTorch] Store Tensor explicitly in IValue
swolchok Dec 4, 2020
0198db9
reduce code duplication on "[PyTorch] Store Tensor explicitly in IValue"
swolchok Dec 4, 2020
cff661b
remove unnecessary std::move on "[PyTorch] Store Tensor explicitly in…
swolchok Dec 4, 2020
805c989
Update on "[PyTorch] Store Tensor explicitly in IValue"
swolchok Dec 12, 2020
cd3ce5f
Update on "[PyTorch] Store Tensor explicitly in IValue"
swolchok Dec 15, 2020
bda623d
Remove Elvis operator. Fix ASAN violation. on "[PyTorch] Store Tensor…
swolchok Dec 16, 2020
1b6544b
Update on "[PyTorch] Store Tensor explicitly in IValue"
swolchok Dec 16, 2020
d774458
rebase, add a few more tests on "[PyTorch] Store Tensor explicitly in…
swolchok Dec 18, 2020
48211e9
more UB removal on "[PyTorch] Store Tensor explicitly in IValue"
swolchok Dec 19, 2020
bad7e5e
fix isAliasOf and isPtrType on "[PyTorch] Store Tensor explicitly in …
swolchok Dec 19, 2020
fd28d3f
Update on "[PyTorch] Store Tensor explicitly in IValue"
swolchok Dec 22, 2020
56a6608
Update on "[PyTorch] Store Tensor explicitly in IValue"
swolchok Dec 22, 2020
3b45f26
Update on "[PyTorch] Store Tensor explicitly in IValue"
swolchok Jan 4, 2021
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Update on "[PyTorch] Store Tensor explicitly in IValue" 
Enables following diff, which will make toTensor() return
`const Tensor&` and allow callers to avoid refcounting overhead.

Differential Revision: [D25324617](https://our.internmc.facebook.com/intern/diff/D25324617/)

[ghstack-poisoned]
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@swolchok
swolchok committed Dec 16, 2020
commit 1b6544b63f08d417b733413dc9a294f9929cf7a8
12 changes: 12 additions & 0 deletions aten/src/ATen/core/ivalue.h
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Original file line number Diff line number Diff line change
Expand Up @@ -319,7 +319,10 @@ struct CAFFE2_API IValue final {
// make this abundantly clear.
//
// payload.as_tensor.~Tensor();
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wclass-memaccess"
memcpy(&payload, &rhs.payload, sizeof(payload));
#pragma GCC diagnostic pop
new (&rhs.payload.as_tensor) at::Tensor(std::move(t));
} else if (rhs.isTensor()) {
rhs.swap(*this);
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this is potentially slow because it needs to do the isTensor checks again (depending on how smart the compiler is with inlining this and proving that the extra branches are never executed). Not sure if relevant in practice, but if you want to optimize it, you could just move lines 332 to 335 into their own subfunction swapWithTensor(lhs, rhs) or something like that and call it from both the isTensor() and rhs.isTensor() case.

Expand Down Expand Up @@ -878,7 +881,10 @@ struct CAFFE2_API IValue final {
//
// rhs.payload.as_tensor.~Tensor();
} else {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wclass-memaccess"
memcpy(&payload, &rhs.payload, sizeof(payload));
#pragma GCC diagnostic pop
}
tag = rhs.tag;
is_intrusive_ptr = rhs.is_intrusive_ptr;
Expand Down Expand Up @@ -913,7 +919,10 @@ struct CAFFE2_API IValue final {
if (isTensor()) {
new (&payload.as_tensor) at::Tensor(p.as_tensor);
} else {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wclass-memaccess"
memcpy(&payload, &p, sizeof(payload));
#pragma GCC diagnostic pop
}
}

Expand Down Expand Up @@ -980,7 +989,10 @@ struct CAFFE2_API WeakIValue final {
IValue lock() const {
if (!is_intrusive_ptr) {
IValue::Payload newPayload;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wclass-memaccess"
memcpy(&newPayload, &payload, sizeof(newPayload));
#pragma GCC diagnostic pop
return IValue(newPayload, tag, false);
}
if (IValue::Tag::Tensor == tag) {
Expand Down
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