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140e5a1495
* Fixed incorrect lexeme generated for string parts in the middle of an interpolated string (Fixes https://github.com/Roblox/luau/issues/744) * DeprecatedApi lint can report some issues without type inference information * Fixed performance of autocomplete requests when suggestions have large intersection types (Solves https://github.com/Roblox/luau/discussions/847) * Marked `table.getn`/`foreach`/`foreachi` as deprecated ([RFC: Deprecate table.getn/foreach/foreachi](https://github.com/Roblox/luau/blob/master/rfcs/deprecate-table-getn-foreach.md)) * With -O2 optimization level, we now optimize builtin calls based on known argument/return count. Note that this change can be observable if `getfenv/setfenv` is used to substitute a builtin, especially if arity is different. Fastcall heavy tests show a 1-2% improvement. * Luau can now be built with clang-cl (Fixes https://github.com/Roblox/luau/issues/736) We also made many improvements to our experimental components. For our new type solver: * Overhauled data flow analysis system, fixed issues with 'repeat' loops, global variables and type annotations * Type refinements now work on generic table indexing with a string literal * Type refinements will properly track potentially 'nil' values (like t[x] for a missing key) and their further refinements * Internal top table type is now isomorphic to `{}` which fixes issues when `typeof(v) == 'table'` type refinement is handled * References to non-existent types in type annotations no longer resolve to 'error' type like in old solver * Improved handling of class unions in property access expressions * Fixed default type packs * Unsealed tables can now have metatables * Restored expected types for function arguments And for native code generation: * Added min and max IR instructions mapping to vminsd/vmaxsd on x64 * We now speculatively extract direct execution fast-paths based on expected types of expressions which provides better optimization opportunities inside a single basic block * Translated existing math fastcalls to IR form to improve tag guard removal and constant propagation
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#pragma once
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#include "Luau/NotNull.h"
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#include "Luau/TypedAllocator.h"
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#include "Luau/Variant.h"
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#include <string>
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#include <optional>
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namespace Luau
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{
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struct Def;
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using DefId = NotNull<const Def>;
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/**
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* A cell is a "single-object" value.
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*
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* Leaky implementation note: sometimes "multiple-object" values, but none of which were interesting enough to warrant creating a phi node instead.
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* That can happen because there's no point in creating a phi node that points to either resultant in `if math.random() > 0.5 then 5 else "hello"`.
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* This might become of utmost importance if we wanted to do some backward reasoning, e.g. if `5` is taken, then `cond` must be `truthy`.
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*/
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struct Cell
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{
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};
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/**
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* A phi node is a union of cells.
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*
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* We need this because we're statically evaluating a program, and sometimes a place may be assigned with
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* different cells, and when that happens, we need a special data type that merges in all the cells
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* that will flow into that specific place. For example, consider this simple program:
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*
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* ```
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* x-1
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* if cond() then
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* x-2 = 5
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* else
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* x-3 = "hello"
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* end
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* x-4 : {x-2, x-3}
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* ```
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*
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* At x-4, we know for a fact statically that either `5` or `"hello"` can flow into the variable `x` after the branch, but
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* we cannot make any definitive decisions about which one, so we just take in both.
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*/
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struct Phi
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{
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std::vector<DefId> operands;
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};
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/**
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* We statically approximate a value at runtime using a symbolic value, which we call a Def.
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*
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* DataFlowGraphBuilder will allocate these defs as a stand-in for some Luau values, and bind them to places that
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* can hold a Luau value, and then observes how those defs will commute as it statically evaluate the program.
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*
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* It must also be noted that defs are a cyclic graph, so it is not safe to recursively traverse into it expecting it to terminate.
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*/
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struct Def
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{
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using V = Variant<struct Cell, struct Phi>;
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V v;
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};
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template<typename T>
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const T* get(DefId def)
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{
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return get_if<T>(&def->v);
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}
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struct DefArena
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{
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TypedAllocator<Def> allocator;
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DefId freshCell();
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// TODO: implement once we have cases where we need to merge in definitions
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// DefId phi(const std::vector<DefId>& defs);
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};
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} // namespace Luau
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