Swift Runtime on WebAssembly #11
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ImageInspectionShared was built only if host OS is Linux. But it's necessary when primary sdk is WASM.
Specify ar binary through extra-cmake-options
Because WASM doesn't support relative pointer, compiler emit direct address instead of offset from current address.
MaxDesiatov
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Nov 14, 2019
* [WASM] Build ImageInspectionShared even on macOS ImageInspectionShared was built only if host OS is Linux. But it's necessary when primary sdk is WASM. * [WASM] Use llvm-ar instead of ranlib on macOS Specify ar binary through extra-cmake-options * [WASM] Install llvm through HomeBrew to use llvm-ar * [WASM] Use llvm-ranlib instead of ranlib of Xcode * [WASM] Read offset as pointer when target is wasm Because WASM doesn't support relative pointer, compiler emit direct address instead of offset from current address. * [WASM] Copy SwiftRT-ELF.cpp into SwiftRT-WASM.cpp * [WASM] Emit empty swift5 sections if there aren't * [WASM] Remove swift_end and swift_start files
MaxDesiatov
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Dec 14, 2019
This PR fixed my runtime implementation in SwiftRT. I've inserted dummy `char` data in each metadata sections to ensure that all start/stop symbols are generated in #11. But of cource this dummy data can be inserted anywhere in the section, so metadata sections were broken by this 1 byte. I changed to link these start/stop symbols weakly. Non-generated start/stop variables get to be uninitialized. So `stop-start` results 0 length, and runtime library can avoid to load empty section. After this and #6 are merged, `print("Hello")` will work again! 🎉
kateinoigakukun
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Dec 14, 2019
This PR fixed my runtime implementation in SwiftRT. I've inserted dummy `char` data in each metadata sections to ensure that all start/stop symbols are generated in swiftwasm#11. But of cource this dummy data can be inserted anywhere in the section, so metadata sections were broken by this 1 byte. I changed to link these start/stop symbols weakly. Non-generated start/stop variables get to be uninitialized. So `stop-start` results 0 length, and runtime library can avoid to load empty section. After this and swiftwasm#6 are merged, `print("Hello")` will work again! 🎉
kateinoigakukun
added a commit
that referenced
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Dec 15, 2019
* [WASM] Build ImageInspectionShared even on macOS ImageInspectionShared was built only if host OS is Linux. But it's necessary when primary sdk is WASM. * [WASM] Use llvm-ar instead of ranlib on macOS Specify ar binary through extra-cmake-options * [WASM] Install llvm through HomeBrew to use llvm-ar * [WASM] Use llvm-ranlib instead of ranlib of Xcode * [WASM] Read offset as pointer when target is wasm Because WASM doesn't support relative pointer, compiler emit direct address instead of offset from current address. * [WASM] Copy SwiftRT-ELF.cpp into SwiftRT-WASM.cpp * [WASM] Emit empty swift5 sections if there aren't * [WASM] Remove swift_end and swift_start files
kateinoigakukun
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to kateinoigakukun/swift
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Jan 11, 2020
This PR fixed my runtime implementation in SwiftRT. I've inserted dummy `char` data in each metadata sections to ensure that all start/stop symbols are generated in swiftwasm#11. But of cource this dummy data can be inserted anywhere in the section, so metadata sections were broken by this 1 byte. I changed to link these start/stop symbols weakly. Non-generated start/stop variables get to be uninitialized. So `stop-start` results 0 length, and runtime library can avoid to load empty section. After this and swiftwasm#6 are merged, `print("Hello")` will work again! 🎉
kateinoigakukun
added a commit
that referenced
this pull request
Jan 11, 2020
* [WASM] Build ImageInspectionShared even on macOS ImageInspectionShared was built only if host OS is Linux. But it's necessary when primary sdk is WASM. * [WASM] Use llvm-ar instead of ranlib on macOS Specify ar binary through extra-cmake-options * [WASM] Install llvm through HomeBrew to use llvm-ar * [WASM] Use llvm-ranlib instead of ranlib of Xcode * [WASM] Read offset as pointer when target is wasm Because WASM doesn't support relative pointer, compiler emit direct address instead of offset from current address. * [WASM] Copy SwiftRT-ELF.cpp into SwiftRT-WASM.cpp * [WASM] Emit empty swift5 sections if there aren't * [WASM] Remove swift_end and swift_start files
kateinoigakukun
added a commit
to kateinoigakukun/swift
that referenced
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Jan 24, 2020
This PR fixed my runtime implementation in SwiftRT. I've inserted dummy `char` data in each metadata sections to ensure that all start/stop symbols are generated in swiftwasm#11. But of cource this dummy data can be inserted anywhere in the section, so metadata sections were broken by this 1 byte. I changed to link these start/stop symbols weakly. Non-generated start/stop variables get to be uninitialized. So `stop-start` results 0 length, and runtime library can avoid to load empty section. After this and swiftwasm#6 are merged, `print("Hello")` will work again! 🎉
kateinoigakukun
added a commit
to kateinoigakukun/swift
that referenced
this pull request
Jan 25, 2020
This PR fixed my runtime implementation in SwiftRT. I've inserted dummy `char` data in each metadata sections to ensure that all start/stop symbols are generated in swiftwasm#11. But of cource this dummy data can be inserted anywhere in the section, so metadata sections were broken by this 1 byte. I changed to link these start/stop symbols weakly. Non-generated start/stop variables get to be uninitialized. So `stop-start` results 0 length, and runtime library can avoid to load empty section. After this and swiftwasm#6 are merged, `print("Hello")` will work again! 🎉
MaxDesiatov
pushed a commit
that referenced
this pull request
Jan 29, 2020
* [WASM] Build ImageInspectionShared even on macOS ImageInspectionShared was built only if host OS is Linux. But it's necessary when primary sdk is WASM. * [WASM] Use llvm-ar instead of ranlib on macOS Specify ar binary through extra-cmake-options * [WASM] Install llvm through HomeBrew to use llvm-ar * [WASM] Use llvm-ranlib instead of ranlib of Xcode * [WASM] Read offset as pointer when target is wasm Because WASM doesn't support relative pointer, compiler emit direct address instead of offset from current address. * [WASM] Copy SwiftRT-ELF.cpp into SwiftRT-WASM.cpp * [WASM] Emit empty swift5 sections if there aren't * [WASM] Remove swift_end and swift_start files
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This PR enables Swift's runtime support on WebAssembly.
What Changed
stdlib/public/runtime/SwiftRT-WASM.cpp
I changed to emit start and end address of sections prefixed with
swift5_such asswift5_protocol_conformances.wasm-ldsupports this feature since llvm/llvm-project@4bce63aTo handle the case when compiler doesn't emit the sections, creates dummy symbol located in the section.
lib/IRGen/MetadataRequest.cpp
__swift_instantiateConcreteTypeFromMangledNamewas designed to use relative pointer, so I changed to use absolute pointer only when WebAssembly.Misc