This adds a typeswitch statement
typeswitch (e)
case (x1 : Type1) {
...
} case (x2 : Type2) {
} ...
... case (xn : TypeN) {
...
}
This checks to which of the given types the result of evaluating e can
be cast, in the order in which they are listed. So if an earlier
type matches, a value of this type won't reach a later case.
The type-checks are performed by calling the cast<T>() macro.
The type of the argument passed to the cast macro is dependent on the
case and excludes all types checked earlier. For example, in
const x : Object = ...
typeswitch (x)
case (x : Smi) {
...
} case (x : HeapNumber) {
...
} case (x : HeapObject) {
...
}
there will be calls to cast<Smi>(Object) and
cast<HeapNumber>(HeapObject), because after the Smi check we know that
x has to be a HeapObject. With the refactored base.tq definition of
cast, this will generate efficient code and avoid repeating the Smi
check in the second case.
The type system ensures that all cases are reachable and that the type
given to the last case is safe without a runtime check (in other words,
the union of all checked types covers the type of e).
The cases can also be written as
case (Type) { ... }
, in which case the switched value is not re-bound with the checked
type.
Bug: v8:7793
Change-Id: Iea4aed7465d62b445e3ae0d33f52921912e095e3
Reviewed-on: https://chromium-review.googlesource.com/1156506
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54958}
Previously, we requested instantiation of generics prior to selecting
a template overload, which resulted in unused templates being
instantiated, possibly triggering unnecessary compile errors.
Bug: v8:7793
Change-Id: I45f4bdbf8aa93749ece416c6c7458d64e6e051f5
Reviewed-on: https://chromium-review.googlesource.com/1154977
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54950}
We currently only expose this to desugarings and not in the grammar
to keep 'const' and 'let' bindings consistent.
A side-effect of this change is that it is now possible to use a
shadowed name in the initializer of a const binding.
Bug: v8:7793
Change-Id: Ic2ca6af0735acf0e748d394f9039fe6612bd4a06
Reviewed-on: https://chromium-review.googlesource.com/1150534
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54755}
This CL changes the for-loop so all parts are optional, allowing
loops like:
for (;;) {}
for (;; ++i) {}
...
R=danno@chromium.org, tebbi@chromium.org
Bug: v8:7793
Change-Id: I7bf9ef9e59d55eb9ae9f38904a1c1106ae50df5a
Reviewed-on: https://chromium-review.googlesource.com/1152727
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54752}
Struct are bundles of value types. They are essentially just shorthand
for passing around a group of individually defined values.
Struct types are declared like this:
struct A {
x: Smi;
y: int32;
}
and can be constructed explicitly like this:
A{0, 0}
Structs can be used wherever other types are used (e.g. variables,
parameters, return values) except for parameter/return types of
builtins and runtime functions.
Struct use field access notation to set/get their values like this:
let a: A = A{0, 0};
let b: Smi = a.x;
a.y = 0;
Change-Id: I9fd36a6514c37882831256a49a50809c5db75b56
Reviewed-on: https://chromium-review.googlesource.com/1122133
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54501}
This CL adds local const bindings. This means that instead of
generating TVARIABLEs for variables, we can generate simple TNodes.
Example:
macro FooBar(): {
const kSomeSmi: Smi = 10;
...
}
This CL also enforces that variables with a constexpr type are bound
using 'const' and not 'let'.
R=tebbi@chromium.org
Bug: v8:7793
Change-Id: Id20a18149df9fc374ce718bdb1478e3eabb6e6df
Reviewed-on: https://chromium-review.googlesource.com/1138316
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54479}
This CL adds constants that can be defined in the module scope:
const kConstexprConst: constexpr int31 = 5;
const kIntptrConst: intptr = 4;
const kSmiConst: Smi = 3;
They are implemented by generating "mini-macros" that return the
expression on the right-hand side of the assignment.
Bug: v8:7793
Change-Id: I0a476cb3111707fad56bf15e9547b377c7adab37
Reviewed-on: https://chromium-review.googlesource.com/1114745
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54430}
Variables/return values with constexpr type cannot have multiple
assignments. We check this now.
For conditionals, it is important to always infer a non-constexpr type.
This CL adds the ability to map any type (including union types) to be
mapped to their non-constexpr variant. Conditionals infer their type as
the non-constexpr version of a combination of the two branch types.
In addition, this improves subtyping for constexpr types:
If A extends B, then constexpr A extends constexpr B.
This makes it necessary to clean up "constexpr String", which has nothing
to do with tagged values.
Bug: v8:7793
Change-Id: Ia4d3cd5dc98f45b0ec89adf05c5c6111a0e51cc6
Reviewed-on: https://chromium-review.googlesource.com/1122864
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54167}
This CL adds the newline character as a valid character
in Torque strings.
You can now write Print('Hello, World!\n') in Torque and it works!
Change-Id: I2a1f87cfef492fedd3d24086e226d3ebaf882115
Reviewed-on: https://chromium-review.googlesource.com/1118229
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Théotime Grohens <theotime@google.com>
Cr-Commit-Position: refs/heads/master@{#54089}
This CL adds a fast path for DataView getters and setters when the
load or store to be performed is aligned and when the requested
endianness matches the platform endianness.
In that case, we can just emit the right load/store instruction
instead of having to read and write data byte by byte.
Change-Id: I10bd95a7fe8d23f695899eb8173bc654fb38fbb0
Reviewed-on: https://chromium-review.googlesource.com/1106168
Commit-Queue: Théotime Grohens <theotime@google.com>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54005}
In the process:
- Add strict ordering of Types so that name mangling is consistent
and build time. Previously, the UnionType stored the union's
types in a std::set<const Type*>, which did not have a consistent
ordering of the types in the set.
- Add a int31 type to enable consistency and correctness of
handling of 'constexpr int31' values on the C++ side.
- By removing the "implicit" keyword for operators, there is now
one less difference between operators and calls, another
incremental step in unifying operators and calls.
- Enable external (i.e. C++-defined) generic specializations
- Add CSA support for checking double ElementsKinds, including
tests.
- Clean up some constexpr/non-constexpr handling of ElementsKinds.
Bug: v8:7793
Change-Id: I27699aba70b98ebf5466e5b62b045d7b1dad62c8
Reviewed-on: https://chromium-review.googlesource.com/1091155
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53664}
This CL changes the behaviour of number literals. Large integer
literals (bigger than Smi, but fit into int32) should have
type "constexpr int32" instead of "constexpr float64".
R=tebbi@chromium.org
Change-Id: I3a83c617c7d257451d299670c891fac5b21d045c
Reviewed-on: https://chromium-review.googlesource.com/1084991
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53522}
This CL is a proposal to add "checked" casts (CAST in CSA) to the Torque language.
The CL adds the "unsafe_cast<>" operator that emits a "CAST".
Example:
let n: Number = ...;
...
if (TaggedIsSmi(n)) {
let m: Smi = unsafe_cast<Smi>(n);
...
}
The cast wont incur a runtime overhead now.
R=tebbi@chromium.org
Change-Id: I9fca90d1d11e61617ba0270e5022fd66200e2195
Reviewed-on: https://chromium-review.googlesource.com/1070151
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53416}
This CL adds grammar support for function pointers to generic builtins.
It also instantiates generic specializations when they are only used
in an assignment to a function pointer.
Example:
builtin GenericBuiltinTest<T: type>(c: Context, param: T): Object {
return Null;
}
let fnptr: builtin(Context, Smi) => Object = GenericBuiltinTest<Smi>;
Change-Id: Ib7e5f47ffc05f14eb5d0b789936587263dfb961d
Reviewed-on: https://chromium-review.googlesource.com/1068731
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53284}
This CL adds the new type expression
builtin(Context, ArgType1, ...) => ReturnType
and allows to use Torque-defined builtins as values of this type, as well
as calling values of this type.
The new function pointer types are subtypes of Code.
Change-Id: Ib7ba3ce6ef7a8591a4c79230dd189fd25698d5b9
Reviewed-on: https://chromium-review.googlesource.com/1060056
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53217}
This CL changes the generated C++ code for LabeledStatementBlocks to
only emit labels if they are used.
Prior to this CL, when a label was only used on one path of an
if constexpr expression, and not at all anywhere else,
the try/label construct would BIND a label that was not used,
causing a CSA verification error.
R=tebbi@chromium.org
Change-Id: Ia81a0cd081b84528c95bbdbdb98b9ab51928e13f
Reviewed-on: https://chromium-review.googlesource.com/1057247
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Simon Zünd <szuend@google.com>
Cr-Commit-Position: refs/heads/master@{#53173}
Change-Id: I37ed9115c099f3d17f23a26348a1bbf5f773ee32
Reviewed-on: https://chromium-review.googlesource.com/1056668
Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Cr-Commit-Position: refs/heads/master@{#53136}
In the process, add a few simple tests for "constexpr" expressions, which
identified a few bugs that are also fixed in this CL.
Change-Id: I97486c781572642d2b574b92133b1f9cda3db592
Reviewed-on: https://chromium-review.googlesource.com/1055493
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53135}
