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ad2708d071
The Dart2JS team has agreed that this mode of compilation is no longer worth investing in at this time and its existence adds some overhead to other feature work so it is worth fully removing. In the future we may revisit this mode of compilation. Below is some more context for any future exploration in this space. What didn't work with modular analysis: - current modular analysis was computing impacts, which were dense (50% of the size of kernel) - using it moved work to a modular phase, and cut Phase1 in half however end-to-end time was not better - data overhead was very high - it made it much harder to maintain invariants throughout the pipeline: the data is tightly coupled with the kernel AST, making it hard to make late modifications to the AST. How to potentially make it better: - make the data much more sparse - make the data more independent from the kernel AST so that transformations are not breaking - reduce the critical path in a more substantial way. Note: We retain and ignore the commandline flags used for modular analysis in order to avoid breaking build pipelines that were passing them. We may remove these at a later date. Change-Id: If574ce2358280ab5fedd89c62665328601e72e22 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/333360 Reviewed-by: Mayank Patke <fishythefish@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Nate Biggs <natebiggs@google.com>
602 lines
24 KiB
Markdown
602 lines
24 KiB
Markdown
# The dart2js compiler
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Welcome to the sources of the dart2js compiler!
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## Architecture
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The compiler is structured to operate in several phases. By default these phases
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are executed in sequence in a single process, but on some build systems, some of
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these phases are split into separate processes. As such, there is plenty of
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indirection and data representations used mostly for the purpose of serializing
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intermediate results during compilation.
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The current compiler phases are:
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1. **common front-end**: Execute traditional front-end compilation phases.
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Dart2js delegates to the common front-end (also used by DDC and the VM) to
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do all front-end features, this includes:
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* parsing Dart source code,
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* type checking,
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* inferring implicit user types, like locals with a `var` declaration,
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* lowering or simplifying Dart features. For example, this is how many
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syntactic features, like extension methods and list comprehensions, are
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implemented.
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* additional web-specific lowering or simplifications. For example,
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expansion of JS-interop features and web specific implementation of
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language features like late variables.
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The result of this phase is a kernel AST which is serialized as a `.dill`
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file.
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2. **tree-shake and create world**: Create a model to understand what parts of
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the code are used by an application. This consists of:
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* creating an intermediate representation called the "K model" that
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wraps our kernel representation
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* calculating which classes and methods are considered live in the
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program. This is done by incrementally combining impact data (i1)
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starting from `main`, then visiting reachable methods in the program
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with an Rapid Type Analysis (RTA) algorithm to aggregate impacts
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together.
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The result of this phase is what we call a "closed world" (w1). The closed
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world is also a datastructure that can answer interesting queries, such as:
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Is this interface implemented by a single class? Is this method available
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in any subtype of some interface? The answers to these questions can help
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the compiler generate higher quality JavaScript.
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3. **global analysis**: Run a global analysis that assumes closed world
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semantics (from w1) and propagates information across method boundaries to
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further understand what values flow through the program. This phase is
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very valuable in narrowing down possibilities that are ambiguous based
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solely on type information written by developers. It often finds
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opportunities that enable the compiler to devirtualize or inline method
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calls, generate code specializations, or trigger performance optimizations.
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The result of this phase is a "global result" (g).
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4. **codegen model**: Create a JS or backend model of the program. This is an
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intermediate representation of the entities in the program we referred to
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as the "J model". It is very similar to the "K model", but it is tailored
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to model JavaScript specific concepts (like the split of constructor bodies
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as separate elements) and provide a mapping to the Dart model.
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5. **codegen**: Generate code for each method that is deemed necessary. This
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includes:
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* build an SSA graph from kernel ASTs and global results (g)
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* optimize the SSA representation
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* compute impact (i2) from optimized code
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* emit JS ASTs for the code
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6. **link tree-shake**: Using the results of codegen, we perform a second
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round of tree-shaking. This is important because code that was deemed
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reachable in (w1) may be found unreachable after optimizations. The process
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is very similar to the earlier phase: we combine incrementally the codegen
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impact data (i2) and compute a codegen closed world (w2).
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When dart2js runs as a single process the codegen phase is done lazily and
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on-demand, together with the tree-shaking phase.
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7. **emit JavaScript files**: The final step is to assemble and minify the
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final program. This includes:
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* Build a JavaScript program structure from the compiled pieces (w2)
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* Use frequency namer to minify names.
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* Emit js and source map files.
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## Code organization
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### Some terminology used in the compiler
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* **world**: the compiler exploits closed-world assumptions to do
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optimizations. The *world* encapsulates some of our knowledge of the
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program, like what's reachable from `main`, which classes are instantiated,
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etc.
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* **universe**: rather than loading entire programs and removing unreachable
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code, the compiler uses a tree-growing approach: it enqueues work based on
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what it sees. While this is happening the *world* is considered to be
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growing, in the past the term *universe* was used to describe this growing
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world. While the term is not completely deleted from the codebase, a lot of
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progress has been made to rename *universe* into *world builders*.
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* **model**: there are many models in the compiler:
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* **entity model**: this is an abstraction describing the elements seen in
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Dart programs, like "libraries", "classes", "methods", etc. We currently
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have two entity models, the "K model" (which is frontend centric and
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usually maps 1:1 with kernel entities) and the "J model" (which is backend
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centric).
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* **emitter model**: this is a model just used for dumping out the structure
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of the program in a .js text file. It doesn't have enough semantic meaning
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to be a JS model for compilation, which is why there is a separate "J
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model".
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* **enqueuer**: a work-queue used to achieve tree-shaking (or more precisely
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tree-growing): elements are added to the enqueuer as we recognize that they
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are needed in a given application (as described by the impact data). Note
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that we even track how elements are used, since some ways of using an
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element require more code than others.
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### Code layout
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Here are some details of our current code layout and what's in each file. This
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list also includes some action items (labeled AI below), which are mainly
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cleanup tasks that we have been discussing for a while:
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**lib folder**: API to use dart2js as a library. This is used by our
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command-line tool to launch dart2js, but also by pub to invoke dart2js as a
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library during `pub-build` and `pub-serve`.
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* `lib/compiler_api.dart`: the compiler API. This API is used by our
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command-line tool to spawn the dart2js compiler. This API (and everything that
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is transitively created from it) has no dependencies on `dart:io` so that the
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compiler can be used in contexts where `dart:io` is not available (e.g.
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running in a browser worker) or where `dart:io` is not used explicitly (e.g.
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running as a pub transformer).
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**lib/src folder**: most of the compiler lives here, as very little of its
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functionality is publicly exposed.
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* `lib/src/dart2js.dart`: the command-line script that runs dart2js. When
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building the SDK, the dart2js snapshot is built using the main method on this
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script. This file creates the parameters needed to invoke the API defined in
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`lib/compiler.dart`. All dependencies on `dart:io` come from here. This is
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also where we process options (although some of the logic is done in
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`options.dart`).
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* `lib/src/compiler.dart`: defines the core `Compiler` object, which contains
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all the logic about what the compiler pipeline does and how data is organized
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and communicated between different phases.
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* `lib/src/closure.dart`: closures are compiled as classes, this file has the
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logic to do this kind of conversion in the Dart element model. This includes
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computing what needs to be boxed and creating fake element models to represent
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closures as classes. We use the fake model approach because the compiler
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currently uses the same element model for Dart and JS. Our goal with the
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compiler rearchitecture described earlier is to have two models. The
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Dart model will be able to encode closures directly, and we'll introduce their
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corresponding classes when we create the corresponding JS model, removing the
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need of the fake elements.
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* `lib/src/colors.dart`: ANSI support for reporting error messages with colors.
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AI: this file should move under a utilities folder.
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* Handling of options: as mentioned earlier `lib/src/dart2js.dart` has some
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handling of command-line options, the rest is divided into these files:
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* `lib/src/commandline_options.dart`: defines the flags that dart2js accepts.
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* `lib/src/options.dart`: defines first-class objects to represent options of
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dart2js. This includes a parse function that can translate flags into their
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corresponding objects. This was added recently to simplify how options were
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propagated throughout the compiler.
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AI: simplify further how we specify options. Ideally all changes can be done
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in a single file (`options.dart`?), and unit-tests can specify options via an
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options object rather than command-line flags.
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* `lib/src/common.dart`: convenience file that reexports code used in many
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places in the compiler.
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AI: consider deleting this file.
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* Constants: the compiler has a constant system that evaluates constant
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expressions based on JS semantics.
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* `lib/src/constants/value.dart`: this is the represented value of a constant
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after it has been evaluated.
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* `lib/src/constants/constant_system.dart`: implements evaluating constant
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Dart expressions and produces values.
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* Common elements: the compiler often refers to certain elements during
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compilation either because they are first-class in the language or because
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they are implicitly used to implement some features. These include:
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* `lib/src/common/elements.dart`: provides an interface to lookup basic
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elements like the class of `Object`, `int`, `List`, and their corresponding
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interface types, constructors for symbols, annotations such as the `identical` function. These are normally restricted
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to elements that are understood directly in Dart.
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* `lib/src/js_backend/backend_helpers.dart`: provides a way to lookup internal
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elements of the JavaScript backend, like our internal
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representation of JSInt31, JSArray, and other implementation-specific
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elements.
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* `lib/src/deferred_load/deferred_load.dart`: general analysis for deferred
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loading. This is where we compute how to split the code in different JS chunks
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or fragments. This is run after resolution, but at a time when no code is
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generated yet, so the decisions made here are used later on by the emitter to
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dump code into different files.
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* `lib/src/dump_info.dart`: a special phase used to create a .info.json file.
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This file contains lots of information computed by dart2js including decisions
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about deferred loading, results of the global type-inference, and the actual
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code generated for each function. The output is used by tools provided in the
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`dart2js_info` package to analyze a program and better understand why
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something wasn't optimized as you'd expect.
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* Tree-shaking: The compiler does two phases of reducing the program size by
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throwing away unreachable code. The first phase is done while resolving the
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program (reachability is basically based on dependencies that appear in the
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code), the second phase is done as functions are optimized (which in turn can
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delete branches of the code and make more code unreachable). Externally
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we refer to it as tree-shaking, but it behaves more like a tree-growing
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algorithm: elements are added as they are discovered or as they are used.
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On some large apps we've seen 50% of code tree-shaken: 20% from the first
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phase, and an additional 30% from the second phase.
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* `lib/src/enqueue.dart`: this is the basic algorithm that adds things as they
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are discovered during resolution.
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* `lib/src/js_backend/enqueuer.dart`: this is the enqueuer used during code
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generation.
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* `lib/src/environment.dart`: simple interface for collecting environment values
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(these are values passed via -D flags on the command line).
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* `lib/src/filenames.dart`: basic support for converting between native and Uri
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paths.
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AI: move to utils
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* `lib/src/id_generator.dart`: simple id generator
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AI: move to utils
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* `lib/src/library_loader.dart`: the loader of the dart2js frontend. Asks the
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compiler to read and scan files, produce enough metadata to understand
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import, export, and part directives and keep crawling. It also triggers the
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patch parser to load patch files.
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* Input/output: the compiler is designed to avoid all dependencies on dart:io.
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Most data is consumed and emitted via provider APIs.
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* `lib/src/compiler.dart`: defines the interface of these providers (see
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`CompilerInput` and `CompilerOutput`).
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* `lib/src/null_compiler_output.dart`: a `CompilerOutput` that discards all
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data written to it (name derives from /dev/null).
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* `lib/src/source_file_provider.dart`: _TODO: add details_.
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* Parsing: most of the parsing logic is now in the `front_end` package,
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currently under `pkg/front_end/lib/src/fasta/scanner` and
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`pkg/front_end/lib/src/fasta/parser`. The `front_end` parser is AST agnostic
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and uses listeners to create on the side what they want as the result of
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parsing. The logic to create dart2js' ASTs is defined in listeners within the
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compiler package:
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* `lib/src/parser/element_listener.dart`: listener used to create the first
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skeleton of the element model (used by the diet parser)
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* `lib/src/parser/partial_elements.dart`: representation of elements in the
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element model whose body is not parsed yet (e.g. a diet-parsed member).
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* `lib/src/parser/node_listener.dart`: listener used to create the body of
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methods.
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* `lib/src/parser/member_listener.dart`: listener used to attach method bodies
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to class members.
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* `lib/src/parser/parser_task.dart`: Task to execute the full parser.
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* `lib/src/parser/diet_parser_task.dart`: Task to execute diet parsing.
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* `lib/src/patch_parser.dart`: additional support for parsing patch files. We
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expect this will also move under `front_end` in the future.
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* URI resolution: the compiler needs special logic to resolve `dart:*` URIs and
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`package:*` URIs. These are specified in three parts:
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* sdk library files are specified in a .platform file. This file has a special
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.ini format which is parsed with `lib/src/platform_configuration.dart`.
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* sdk patch files are hardcoded in the codebase in
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`lib/src/js_backend/backend.dart` (see `_patchLocations`).
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* `lib/src/resolved_uri_translator.dart`: has the logic to translate all these
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URIs when they are encountered by the library loader.
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AI: consider changing the .platform file format to yaml.
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* `lib/src/typechecker.dart`: the type checker (spec mode semantics, no support
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for strong mode here).
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* World: _TODO: add details_
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* `lib/src/world.dart`
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* `lib/src/universe/call_structure.dart`
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* `lib/src/universe/use.dart`
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* `lib/src/universe/feature.dart`
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* `lib/src/universe/world_impact.dart`
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* `lib/src/universe/selector.dart`
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* `lib/src/universe/side_effects.dart`
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* `lib/src/universe/class_set.dart`
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* `lib/src/universe/world_builder.dart`
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* `lib/src/universe/function_set.dart`
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* Testing, debugging, and what not: _TODO: add details_
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* `lib/src/tracer.dart`
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* `lib/src/use_unused_api.dart`
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* SSA (`lib/src/ssa`): internal IR used to optimize functions before emitting
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JavaScript. _TODO: add details_.
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* `ssa.dart`
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* `kernel_string_builder.dart`
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* `codegen.dart`
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* `variable_allocator.dart`
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* `type_builder.dart`
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* `value_set.dart`
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* `types.dart`
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* `jump_handler.dart`
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* `codegen_helpers.dart`
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* `switch_continue_analysis.dart`
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* `types_propagation.dart`
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* `nodes.dart`
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* `kernel_ast_adapter.dart`
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* `graph_builder.dart`
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* `validate.dart`
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* `builder.dart.rej`
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* `interceptor_simplifier.dart`
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* `builder_kernel.dart`
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* `locals_handler.dart`
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* `optimize.dart`
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* `kernel_impact.dart`
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* `invoke_dynamic_specializers.dart`
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* `builder.dart`
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* `ssa_branch_builder.dart`
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* `value_range_analyzer.dart`
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* `ssa_tracer.dart`
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* `loop_handler.dart`
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* `tool`: some helper scripts, some of these could be deleted
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* `tool/perf.dart`: used by our benchmark runners to measure performance of
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some frontend pieces of dart2js. We should be able to delete it in the near
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future once the front end code is moved into `fasta`.
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* `tool/perf_test.dart`: small test to ensure we don't break `perf.dart`.
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* `tool/track_memory.dart`: a helper script to see memory usage of dart2js
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while it's running. Used in the past to profile the global analysis phases
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when run on very large apps.
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* `tool/dart2js_stress.dart` and `tool/dart2js_profile_many.dart`: other
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helper wrappers to make it easier to profile dart2js with Observatory.
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* Source map tracking (`lib/src/io`): helpers used to track source information
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and to build source map files. _TODO: add details_.
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* `lib/src/io/code_output.dart`
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* `lib/src/io/source_map_builder.dart`
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* `lib/src/io/start_end_information.dart`
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* `lib/src/io/position_information.dart`
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* `lib/src/io/source_information.dart`
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* `lib/src/io/source_file.dart`
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* `lib/src/io/line_column_provider.dart`
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* Kernel conversion (`lib/src/kernel`): temporary code to create kernel within
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dart2js (previously known as `rasta`). Most of this code will be gone when we
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are in the final architecture. _TODO: add details_.
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* `lib/src/kernel/task.dart`
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* `lib/src/kernel/kernel_visitor.dart`
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* `lib/src/kernel/kernel_debug.dart`
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* `lib/src/kernel/unresolved.dart`
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* `lib/src/kernel/kernel.dart`
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* `lib/src/kernel/unavailable.dart`
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* `lib/src/kernel/accessors.dart`
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* `lib/src/kernel/constant_visitor.dart`
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* `lib/src/kernel/error.dart`
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* Global whole-program analysis (a.k.a. type inference): We try to avoid the
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term "type inference" to avoid confusion with strong-mode type inference.
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However the code still uses the term inference for this global analysis. The
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code is contained under `lib/src/inferrer`. _TODO: add details_.
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* `lib/src/inferrer/type_graph_dump.dart`
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* `lib/src/inferrer/node_tracer.dart`
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* `lib/src/inferrer/list_tracer.dart`
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* `lib/src/inferrer/closure_tracer.dart`
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* `lib/src/inferrer/inferrer_engine.dart`
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* `lib/src/inferrer/type_graph_inferrer.dart`
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* `lib/src/inferrer/type_graph_nodes.dart`
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* `lib/src/inferrer/type_system.dart`
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* `lib/src/inferrer/debug.dart`
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* `lib/src/inferrer/locals_handler.dart`
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* `lib/src/inferrer/map_tracer.dart`
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* `lib/src/inferrer/builder.dart`
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---------
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_TODO: complete the documentation for the following files_.
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`lib/src/ordered_typeset.dart`
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`lib/src/script.dart`
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