| Commit message (Collapse) | Author | Age | Files | Lines |
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Instead of dragging another stack value around to mark if the iterator
was done, rather pass it an offset it should jump to if so. It can then
jump over any IteratorClose instruction while the ExceptionHandler can
still point to the IteratorClose instruction.
For this to work, we also have to refrain from checking for exceptions
as part of IteratorNext or IteratorClose. If IteratorNext generates an
exception, it also jumps to the "done" label, after which we dispatch
the exception. We don't want to jump to the exception handler for other
instructions in between as that would close the iterator. The iterator
should _not_ be closed if it has just thrown an exception, though. The
same holds for IteratorClose: If it throws an exception, we don't want
to jump back to the beginning of the loop's exception handler, since
that would produce an infinite loop. We also don't want to reset the
exception handler before IteratorClose because it needs to also be reset
if the iterator does not need to be closed.
This saves quite a few instructions and stack variables on actual
iteration.
For destructuring, we have to change the execution flow a bit. We need
to first perform the iteration for non-rest parameters, saving the
results in separate stack slots. This way we can apply our new "jump if
done" behavior if the iterator runs out or produces an exception itself.
We then save the "done" state in a separate stack slot, as before.
During the assignment of the iteration results to the actual variables,
we install an exception handler, so that we can still close the iterator
if one of the initializers throws an exception. This produces a few more
instructions than before:
1. We need to set and read the "needsClose" variable explicitly rather
than having IteratorNext and IteratorDone do it implicitly.
2. We need an additional CheckException after the iteration.
3. We need an additional conditional Jump over the IteratorDone.
Everything considered, the savings we get for regular iteration and the
more consistent semantics of the instructions involved are well worth
the few extra instructions on destructuring, especially since everything
those extra instructions do was done implicitly by the iterator
instructions before.
For consistency, the IteratorNextForYieldStar instruction is refactored
to work the same way as IteratorNext: In case of either an exception or
"done" it jumps to an offset, and we refrain from individually
exception-checking each IteratorNextForYieldStart instruction.
Task-number: QTBUG-116725
Change-Id: I9e2ad4319495aecabafdbbd3dd0cbf3c6191f942
Reviewed-by: Olivier De Cannière <olivier.decanniere@qt.io>
Reviewed-by: Sami Shalayel <sami.shalayel@qt.io>
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Lookups can throw exceptions and we want those reported with correct
line numbers.
Pick-to: 6.6
Fixes: QTBUG-114483
Change-Id: Ie922df8a4207bd8b3746f0f3a256f6fcac0b43d6
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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We cannot assume anything about the accumulator register after calling
PushCallContext::call(). Also add a note about not needing to re-load
the accumulator on ThrowException.
Pick-to: 6.5 6.2 5.15
Fixes: QTBUG-111935
Change-Id: I7196585e1d2697c215f4fe87d8d7ac9b98b622a3
Reviewed-by: <carl@carlschwan.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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We need to do the subscript lookup before generating the arguments since
the arguments may change the array.
Fixes: QTBUG-106708
Change-Id: Ia3a0dd34c6ed8d39e86ad20911a632d691826322
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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Replace the current license disclaimer in files by
a SPDX-License-Identifier.
Files that have to be modified by hand are modified.
License files are organized under LICENSES directory.
Pick-to: 6.4
Task-number: QTBUG-67283
Change-Id: I63563bbeb6f60f89d2c99660400dca7fab78a294
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
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Type assertions actually check whether the expression matches the type,
and return null if it doesn't.
[ChangeLog][QtQml] You can use TypeScript-like type assertions using
"as" now. In contrast to TypeScript, QML's type assertions are enforced
at runtime. If the type doesn't match, null is returned for object
types. Also, type assertions can only cast to object types. There is no
way to create a value type or primitive type reference. As value types
and primitives cannot be polymorphic, this doesn't matter, though.
There are other ways of converting those.
Task-number: QTBUG-93662
Change-Id: I00fce3d4ea7a8c6b4631c580eaf6c113ac485813
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
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This change implements optional chaining (https://github.com/tc39/proposal-optional-chaining) by adding a new type of optional lookup with an offset to the end of a chain.
If `undefined` or `null` is encountered during an access marked as optional, we jump to that end offset.
Features:
- Full support for all kinds of optional chain
- With some codegen overhead but zero overhead during normal non-optional FieldMemberExpression resolution
- Properly retains this contexts and does not need to resolve anything twice (this has been an issue previously)
- No extra AST structures, just flags for existing ones
[ChangeLog][QtQml] Added support for optional chaining (https://github.com/tc39/proposal-optional-chaining)
Fixes: QTBUG-77926
Change-Id: I9a41cdc4ca272066c79c72b9b22206498a546843
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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Our current approach to building universal macOS Qt is to pass 2 -arch
flags to clang, which underneath spawn 2 clang invocations with each
separate arch and lipo-s the result together.
This approah also meanss that we do only one set of config tests for
the main (first) architecture.
Currently Qml doesn't support JITing for macOS on Apple Silicon
(arm64), but if the first architecture is x86_64, the qml_jit feature
will be set to 'true', and cause compilation errors when trying to
build the arm slice of the jit source files.
To circumvent that, and allow skipping compilation of JIT specific
code, we have to apply the same trick we do in qtbase,
which is to set a compile definition that takes the current
architecture into account, and surround all relevant code with an #if
block taking to account both the feature and current architecture.
Use a custom hacky qt_extra_definition call to redefine the value of
QT_FEATURE_qml_jit based on the original feature value and the current
architecture.
Additionally, surround the jit source files with #if
QT_CONFIG(qml_jit).
Amends 561a2cec9b95b22783a00b48078b532010357066
Task-number: QTBUG-85447
Change-Id: I28b286d218333076223177c456175f180888a667
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
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The "in" operator may throw an exception.
Change-Id: I7d0b6e2212ac6ec237fbf14719349f8e23810028
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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Commit d4edf441257b7e5782a6c25802d821647ffcba45 fixed the issue for
architectures where the return value register overlaps with the
accumulator register and thus clobbers it (x86-64, x86). The issue
however persisted on ARMv7 (and in theory also ARMv8). Further
investigation suggests that another source of clobbering of the
accumulator register may be the caller of the JIT generated code itself,
since we never explicitly initialize the register. So if one of the
first byte code instructions is the creation of a call context or
ConvertThisToObject - anything that saves the register to the JS stack
frame - then we could end up with the GC trying to mark a value that
contains garbage (or looks like a managed, typically).
Change-Id: I719e189c3314c85adb23fb2ab2a0acf26a418d4e
Task-number: QTBUG-83384
Pick-to: 5.15
Pick-to: 5.12
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
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Conflicts:
src/qml/jit/qv4baselinejit.cpp
src/qml/jsruntime/qv4vme_moth.cpp
tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp
Change-Id: Iec7cd27ddad0281bd3b7833fb6b252f66a6ae5d6
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Change-Id: I6472cd72b27c69257efe54376e428274ebf68050
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We need to keep the accumulator alive across function calls. This
requires:
1, Saving the accumulator on the stack if the function might allocate, to
protect it from the garbage collector. However, we don't need to do
that if the result of the function is to be saved in the accumulator
and the function itself doesn't use the accumulator as argument. In
this case the previous value becomes unaccessible and we might as
well GC it.
2, In the JIT, restoring the accumulator from the stack after the
function call if we want to ignore the return value.
3, Therefore, also saving the accumulator on the stack before calling in
case of 2.
We assume that we don't need to keep the accumulator alive across the
jump to the exception handler. Saving the accumulator more often than
necessary is detrimental for performance. To make sure the assumption
holds, explicitly load the accumulator with undefined _before_ jumping
to any exception handler.
Change-Id: I78cbc42847b8885a0659b23f3b81655b7f1a0bc4
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Conflicts:
tests/auto/qml/qjsengine/tst_qjsengine.cpp
Change-Id: I34df194046a91ee8a076ce28022eb99d68e7f362
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Conflicts:
src/qml/jsruntime/qv4memberdata.cpp
Change-Id: I4e9ffc89d65279a42516f5547e93fb47fb571834
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We don't use the accumulator in that method. It could contain any random
value.
Fixes: QTBUG-75642
Change-Id: I41f958c1174cce76d0d77e14d5617d441aaf1e11
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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The static part can be used for compilation and won't resolve managed
objects. This allows us to remove all the remaining V4_BOOTSTRAP.
Change-Id: Id2f6feb64c48beb2a407697881aea8c0d791a532
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Add an atomic isInterrupted flag to BaseEngine and check that in
addition to the hasException flag on checkException(). Add some more
exception checks to cover all possible infinite loops. Also, remove the
writeBarrierActive member from QV4::EngineBase. It isn't used.
Fixes: QTBUG-49080
Change-Id: I86b3114e3e61aff3e5eb9b020749a908ed801c2b
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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The tracing JIT won't be finished. Therefore, remove the parts that have
already been integrated.
Change-Id: If72036be904bd7fc17ba9bcba0a317f8ed6cb30d
Reviewed-by: Erik Verbruggen <erik.verbruggen@me.com>
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This way you can enable or disable the JIT when configuring Qt. The
conditions for the availability of the JIT have also been cleaned up.
There is no reason anymore to artificially restrict availability on x86
and x86_64. The reason for the existence of those clauses are old
problems on windows that have been fixed by now. However, on arm and
arm64, we need a specialization of the cacheFlush() function for each OS
to be supported. Therefore, restrict to the systems for which such a
specialization exists. iOS and tvOS are technically supported and you
can enable the JIT via the feature flag now. Due to Apple's policy we
disable it by default, though.
Change-Id: I5fe2a2bf6799b2d11b7ae7c7a85962bcbf44f919
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Conflicts:
src/qml/compiler/qv4compileddata_p.h
src/qml/jit/qv4baselinejit.cpp
src/qml/jit/qv4jithelpers.cpp
src/qml/jsruntime/qv4lookup.cpp
src/qml/jsruntime/qv4runtime.cpp
src/qml/jsruntime/qv4runtimeapi_p.h
src/qml/jsruntime/qv4vme_moth.cpp
src/qml/qml/qqmltypemodule_p.h
Change-Id: If28793e9e08418457a11fc2c5832f03cab2fcc76
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Conflicts:
src/qml/compiler/qqmltypecompiler.cpp
src/qml/compiler/qv4bytecodehandler.cpp
src/qml/compiler/qv4codegen.cpp
src/qml/compiler/qv4compileddata_p.h
src/qml/compiler/qv4compiler.cpp
src/qml/compiler/qv4instr_moth.cpp
src/qml/compiler/qv4instr_moth_p.h
src/qml/jit/qv4baselinejit.cpp
src/qml/jit/qv4baselinejit_p.h
src/qml/jsruntime/qv4function.cpp
src/qml/jsruntime/qv4vme_moth.cpp
Change-Id: I8fb4d6f19677bcec0a4593b250f2eda5ae85e3d2
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After enabling lookups in QML files, we can remove all the code that
tries to deal with (type) compile time detection of access to id objects
and properties of the scope/context object. This also allows removing
quite a bit of run-time code paths and even byte code instructions.
Task-number: QTBUG-69898
Change-Id: I7b26d7983393594a3ef56466d3e633f1822b76f4
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
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When resolving names in the context of QML bindings, we now direct
runtime access to QQmlContextWrapper::resolveQmlPropertyLookupGetter. At the
moment this does basically the same as Runtime::method_loadName, which
we called earlier. However this now provides the opportunity to optimize
lookups in the QML context in a central place.
When performing a call on a scope or context object property, we also
did not use a CallName() instruction - which would have gotten the
thisObject wrong - but instead we use a dedicated
CallScopeObjectProperty and CallContextObjectProperty instruction. These
rely on identifying these properties at compile time, which goes away
with lookups (and also doesn't work when using ahead-of-time
compilation). Therefore the qml context property lookup is using a
getPropertyAndBase style signature and
Runtime::method_callQmlContextPropertyLookup uses that.
For the tests to pass, some error expectations need adjusting. In
particular the compile-time detection of write attempts to id objects is
now delayed to the run-time.
The old code path is still there and will be removed separately in the
next commit (as it is massive).
Task-number: QTBUG-69898
Change-Id: Iad1ff93d3758c4db984a7c2d003beee21ed2275c
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
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Change-Id: I0bb5055024e30c32b82e1555c820ea5ced8923f5
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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The declarations and usage of runtime functions have seen a number of
changes:
- we don't use the array of method pointers anymore because we don't use
cross-platform AOT JITting
- the check if a method can throw a JS exception was invalid, and was
not used anymore
- value-pointer vs. const-value-ref was inconsistent
This patch cleans that up. By fixing the exception checking, we can now
use it in the baseline JIT to automatically insert those checks. To make
that work correctly, all runtime methods are in a struct, which gets
annotated to indicate if that method throws. (The old way of checking
which type of engine was used is fragile: some non-throwing methods
do not take an engine parameter at all, and those got flagged as
throwing). By using a struct, we can also get rid of a bunch of
interesting macros.
The flags in the struct (as mentioned above) can later be extended to
capture more information, e.g. if a method will change the context.
Change-Id: I1e0b9ba62a0bf538eb728b4378e2678136e29a64
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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If ProcessInstruction is returned, the generate_* function and
endInstruction will be called. If SkipInstruction is returned, they
won't be called. This can be used by subclasses that can detect dead
code, to suppress handling that code.
Change-Id: I3b4a8eebb5701f287c8199bd40bc63fe04a35007
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
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Now other subclasses of the BytecodeHandler can also use the method.
Change-Id: Ib1a19e5ef6beb6c62b6a0214a6658f57b7e74a1a
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
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When analyzing the bytecode from top-to-bottom in a single pass, we
don't know when a jump back to previously seen code occurs. For example,
in the baseline JIT we would already have generated code for some
bytecode when we see a jump back (like at the end of a loop body), and
we can't go back and insert a label to jump to.
As JavaScript has no goto's, the only backward jumps are at the end of
loops, so there are very few cases where we need to actually generate
labels.
This was previously handled by analyzing the bytecode twice: once to
collect all jump targets, and then second pass over the bytecode to do
the actual JITting (which would use the jump targets to insert labels).
We can now do that with one single pass. So the trade-off is to store
4 bytes more per function plus 4 bytes for each loop, instead of having
to analyze all functions only to find where all jumps are each time that
function is JITted.
Change-Id: I3abfcb69f65851a397dbd4a9762ea5e9e57495f6
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
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Collect type information about values used in a function. These include
all parameters, and the results of many bytecode instructions. For array
loads/stores, it also tracks if the access is in-bounds of a
SimpleArrayData.
Collection is only enabled when the qml-tracing feature is turned on
while configuring.
In subsequent patches this is used to generated optimized JITted code.
Change-Id: I63985c334c3fdc55fca7fb4addfe3e535989aac5
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
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If a tagged template gets evaluated multiple times, the
underlying template object is shared.
Change-Id: Ie2f476fbc93d5991322ce1087c42719a8d8333ae
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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This runtime function was the only one taking argc before arguments.
Change-Id: If0b049697f7fcc2746e8d287193a5b1230a6ea56
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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Change-Id: If1629109722496b3fd10b36b2376548440f2fee9
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Doing the tail call in the runtime will come in a follow-up patch
Change-Id: I8224aac0edbdc765ee9b97703948edd52fd33f3e
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Get rid of Primitive and move the corresponding methods
directly into Value. Mark many methods in Value as
constexpr and turn Value into a POD type again.
Keep Primitive as a pure alias to Value for source
compatibility of other modules that might be using it.
Change-Id: Icb47458947dd3482c8852e95782123ea4346f5ec
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Match the argument order to the lookup functions being
called to minimize register shuffling that needs to be
done inside the function.
Change-Id: I0c55234d0c86b524dad021a519c6416d62d34c52
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Change-Id: I5b054b59519ed825459a5b0b0a7cd2c6fc8a3797
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Change-Id: Id1bba1a729124bccb8a90dcf40252fe5c69d27a3
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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When an exception happens during destructuring, IteratorClose
needs to be called, unless the exception happened inside the
IteratorNext call (in that case the iterator is assumed to be
invalid and we shouldn't call close on it).
Implement this, by ensuring that we set the done return variable
of IteratorNext to true whenever IteratorNext throws an exception.
IteratorClose will check the done state and not do anything in that
case.
Change-Id: I73a27f855f2c4d3134b8cc8980e64bf797d03886
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Change-Id: Ia520d43ea2c29c16cfc8ffc86a32187a78848502
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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As per spec, this should be uninitialized in derived
constructors, and the base constructor needs to get
called exactly once.
Change-Id: If31804e58d7ba62efde8fbf6cd852674f8da4495
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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With const and let it is possible to access the declared member before
initialization. This is expected to throw a type reference error at
run-time.
We initialize such variables with the empty value when entering their
scope and check upon access for that. For locals we place the lexically
scoped variables at the end. For register allocated lexical variables we
group them into one batch and remember the index/size.
Change-Id: Icb493ee0de0525bb682e1bc58981a4dfd33f750e
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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This makes it easier to re-use them later on, without inheriting all
extra stuff that the baseline JIT needs.
Change-Id: I9368b16017b8b9d99f8c005a5b47ec9f9ed09fb0
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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When executing an interpreter instruction, the code pointer points to
the next instruction. However, sometimes a pointer to the current
instruction is needed. That was hacked-around by having startInstruction
be called before updating the pointer. This is confusing and leads to
unexpected off-by-one-instruction cases.
So now during startInstruction calls and generate_instructionName calls,
there is a currentInstructionOffset() and a nextInstructionOffset() that
do what's on the tin in both places.
Change-Id: Ie8dd35ff0a7d236f008030ef4c29ec3f31c07349
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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The entry point from the parsing perspective into modules is not
QV4::Script but QV4::ExecutionEngine::compileModule.
For convenience, the ESModule AST node gets a body, which is the
statement list connected between the ModuleItemList items that are not
import/export declarations.
The QV4::Module allocates a call context where the exported variables
are stored as named locals. This will also become the module namespace
object.
The imports in turn is an array of value pointers that point into the
locals array of the context of the imported modules.
The default module loading in ExecutionEngine assumes the accessibility
of module urls via QFile (so local file system or resource). This is
what qmljs also uses and QJSEngine as well via public API in the future.
The test runner compiles the modules manually and injects them, because
they need to be compiled together with the test harness code.
The QML type loader will the mechanism for injection in the future for
module imports from .qml files.
Change-Id: I93be9cfe54c651fdbd08c5e1d22d58f47284e54f
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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Generally super.foo = bar calls the storeSuperProperty run-time method,
which expects the engine as the first parameter, not the function
pointer.
Amends commit d31541fd9d7d52ef3eae29e7e5d36733d7f55375
Change-Id: Ic0c933e855066273a635fe62ad88316c75cb8f45
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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Those are mostly working now, but when calling super properties
the this object is not setup correctly.
Change-Id: Ib42129ae6e729eeca00275f707f480371b7e42a5
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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GetLookup and GetLookupA were doing exactly the same thing. Only keep
the version that expects the base object in the accumulator and
rename it to GetLookup.
Change-Id: Ia14256880cef23f7b70d8c7e6bb74aba371b8d9a
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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Implement super call support for class constructor
functions.
Change-Id: I3c64276234689cf4f644b095e0fc8ca1c634ac53
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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This is required to be able to support the super() call.
Change-Id: I9998680341d701727ac1697187ad33481bdde422
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
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