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WIP: [Swift+WASM] patches to support compiling Swift to WebAssembly #155

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WIP: [Swift+WASM] patches to support compiling Swift to WebAssembly #155

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Commits on Oct 22, 2019

  1. WebAssembly: enable Swift calling convention in ISelLowering, ignore … 

    …hot/cold split directives
    @zhuowei @MaxDesiatov
    zhuowei authored and MaxDesiatov committed Oct 22, 2019
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  2. write Clang precompiled headers to a custom section 

    This doesn't fix the alignment issue yet.

See https://bugs.llvm.org/show_bug.cgi?id=35928 and
https://reviews.llvm.org/D42233.
    @zhuowei @MaxDesiatov
    zhuowei authored and MaxDesiatov committed Oct 22, 2019
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  3. WebAssembly: pad __clangast section to 4 bytes 

    Like Patcheng's https://reviews.llvm.org/D42233 but for Custom Sections instead

padding for the padding gods.
    @zhuowei @MaxDesiatov
    zhuowei authored and MaxDesiatov committed Oct 22, 2019
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  4. WebAssembly: attempt to fix non-SymbolExpr relocations 

    Also try hard to extract a symbol from a MCExpr when writing relocations

I doubt this is the right way, but hey it emits an object now
    @zhuowei @MaxDesiatov
    zhuowei authored and MaxDesiatov committed Oct 22, 2019
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  5. WebAssembly: add logging when I get a BinaryExpr 

    I actually do need to know what's breaking.
    @zhuowei @MaxDesiatov
    zhuowei authored and MaxDesiatov committed Oct 22, 2019
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  6. WebAssembly: properly handle MCBinaryExpr in aliased symbols 

    Swift uses aliased symbols to refer to offsets within metadata structures.

eg

```
@"$s12SwiftPrivate28_stdlib_ShardedAtomicCounterVN" = alias %swift.type, bitcast (i32* getelementptr inbounds (<{ i8**, i32, <{ i32, i32, i32, i32, i32, i32, i32 }>*, i32, i32 }>, <{ i8**, i32, <{ i32, i32, i32, i32, i32, i32, i32 }>*, i32, i32 }>* @"$s12SwiftPrivate28_stdlib_ShardedAtomicCounterVMf", i32 0, i32 1) to %swift.type*)
```

My previous commit only got the alias to refer to the correct target symbol,
but not at the right offset.

This commit properly emits these symbols.

With this change, print("hello world") works but print() with anything else is still broken.
    @zhuowei @MaxDesiatov
    zhuowei authored and MaxDesiatov committed Oct 22, 2019
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  7. Revert "WebAssembly: add logging when I get a BinaryExpr" 

    Don't need the logging anymore

This reverts commit 8b8f31f.
    @zhuowei @MaxDesiatov
    zhuowei authored and MaxDesiatov committed Oct 22, 2019
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  8. Fix MCWasmStreamer.cpp after merge conflict

    @MaxDesiatov
    MaxDesiatov committed Oct 22, 2019
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