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82 lines
2.7 KiB
82 lines
2.7 KiB
3 years ago
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package compiler
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// This file defines alias functions for functions that are normally defined in
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// Go assembly.
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//
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// The Go toolchain defines many performance critical functions in assembly
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// instead of plain Go. This is a problem for TinyGo as it currently (as of
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// august 2021) is not able to compile these assembly files and even if it
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// could, it would not be able to make use of them for many targets that are
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// supported by TinyGo (baremetal RISC-V, AVR, etc). Therefore, many of these
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// functions are aliased to their generic Go implementation.
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// This results in slower than possible implementations, but at least they are
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// usable.
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import "tinygo.org/x/go-llvm"
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var stdlibAliases = map[string]string{
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// math package
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"math.Asin": "math.asin",
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"math.Asinh": "math.asinh",
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"math.Acos": "math.acos",
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"math.Acosh": "math.acosh",
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"math.Atan": "math.atan",
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"math.Atanh": "math.atanh",
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"math.Atan2": "math.atan2",
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"math.Cbrt": "math.cbrt",
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"math.Ceil": "math.ceil",
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"math.Cos": "math.cos",
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"math.Cosh": "math.cosh",
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"math.Erf": "math.erf",
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"math.Erfc": "math.erfc",
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"math.Exp": "math.exp",
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"math.Expm1": "math.expm1",
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"math.Exp2": "math.exp2",
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"math.Floor": "math.floor",
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"math.Frexp": "math.frexp",
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"math.Hypot": "math.hypot",
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"math.Ldexp": "math.ldexp",
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"math.Log": "math.log",
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"math.Log1p": "math.log1p",
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"math.Log10": "math.log10",
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"math.Log2": "math.log2",
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"math.Max": "math.max",
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"math.Min": "math.min",
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"math.Mod": "math.mod",
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"math.Modf": "math.modf",
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"math.Pow": "math.pow",
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"math.Remainder": "math.remainder",
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"math.Sin": "math.sin",
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"math.Sinh": "math.sinh",
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"math.Sqrt": "math.sqrt",
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"math.Tan": "math.tan",
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"math.Tanh": "math.tanh",
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"math.Trunc": "math.trunc",
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}
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// createAlias implements the function (in the builder) as a call to the alias
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// function.
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func (b *builder) createAlias(alias llvm.Value) {
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if b.Debug {
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if b.fn.Syntax() != nil {
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// Create debug info file if present.
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b.difunc = b.attachDebugInfo(b.fn)
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}
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pos := b.program.Fset.Position(b.fn.Pos())
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b.SetCurrentDebugLocation(uint(pos.Line), uint(pos.Column), b.difunc, llvm.Metadata{})
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}
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entryBlock := llvm.AddBasicBlock(b.llvmFn, "entry")
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b.SetInsertPointAtEnd(entryBlock)
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if b.llvmFn.Type() != alias.Type() {
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b.addError(b.fn.Pos(), "alias function should have the same type as aliasee "+alias.Name())
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b.CreateUnreachable()
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return
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}
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result := b.CreateCall(alias, b.llvmFn.Params(), "")
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if result.Type().TypeKind() == llvm.VoidTypeKind {
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b.CreateRetVoid()
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} else {
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b.CreateRet(result)
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}
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}
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