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* A small subset of control-flow refinements have been added to recognize type options that are unreachable after a conditional/unconditional code block. (Fixes https://github.com/Roblox/luau/issues/356). Some examples: ```lua local function f(x: string?) if not x then return end -- x is 'string' here end ``` Throwing calls like `error` or `assert(false)` instead of 'return' are also recognized. Existing complex refinements like type/typeof and tagged union checks are expected to work, among others. To enable this feature, `LuauTinyControlFlowAnalysis` exclusion has to be removed from `ExperimentalFlags.h`. If will become enabled unconditionally in the near future. * Linter has been integrated into the typechecker analysis so that type-aware lint warnings can work in any mode `Frontend::lint` methods were deprecated, `Frontend::check` has to be used instead with `runLintChecks` option set. Resulting lint warning are located inside `CheckResult`. * Fixed large performance drop and increased memory consumption when array is filled at an offset (Fixes https://github.com/Roblox/luau/issues/590) * Part of [Type error suppression RFC](https://github.com/Roblox/luau/blob/master/rfcs/type-error-suppression.md) was implemented making subtyping checks with `any` type transitive. --- In our work on the new type-solver: * `--!nocheck` mode no longer reports type errors * New solver will not be used for `--!nonstrict` modules until all issues with strict mode typechecking are fixed * Added control-flow aware type refinements mentioned earlier In native code generation: * `LOP_NAMECALL` has been translated to IR * `type` and `typeof` builtin fastcalls have been translated to IR/assembly * Additional steps were taken towards arm64 support
57 lines
1.9 KiB
C++
57 lines
1.9 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 <vector>
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#include <stddef.h>
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#include <stdint.h>
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namespace Luau
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{
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namespace CodeGen
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{
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constexpr uint32_t kCodeAlignment = 32;
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struct CodeAllocator
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{
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CodeAllocator(size_t blockSize, size_t maxTotalSize);
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~CodeAllocator();
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// Places data and code into the executable page area
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// To allow allocation while previously allocated code is already running, allocation has page granularity
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// It's important to group functions together so that page alignment won't result in a lot of wasted space
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bool allocate(
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const uint8_t* data, size_t dataSize, const uint8_t* code, size_t codeSize, uint8_t*& result, size_t& resultSize, uint8_t*& resultCodeStart);
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// Provided to callbacks
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void* context = nullptr;
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// Called when new block is created to create and setup the unwinding information for all the code in the block
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// 'startOffset' reserves space for data at the beginning of the page
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void* (*createBlockUnwindInfo)(void* context, uint8_t* block, size_t blockSize, size_t& startOffset) = nullptr;
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// Called to destroy unwinding information returned by 'createBlockUnwindInfo'
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void (*destroyBlockUnwindInfo)(void* context, void* unwindData) = nullptr;
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// Unwind information can be placed inside the block with some implementation-specific reservations at the beginning
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// But to simplify block space checks, we limit the max size of all that data
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static const size_t kMaxReservedDataSize = 256;
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bool allocateNewBlock(size_t& unwindInfoSize);
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// Current block we use for allocations
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uint8_t* blockPos = nullptr;
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uint8_t* blockEnd = nullptr;
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// All allocated blocks
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std::vector<uint8_t*> blocks;
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std::vector<void*> unwindInfos;
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size_t blockSize = 0;
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size_t maxTotalSize = 0;
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};
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} // namespace CodeGen
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} // namespace Luau
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