chore: go mod vendor / tidy

vendor/github.com/mmcloughlin/avo/pass/pass.go

@@ -0,0 +1,101 @@
+// Package pass implements processing passes on avo Files.
+package pass
+
+import (
+	"io"
+
+	"github.com/mmcloughlin/avo/ir"
+	"github.com/mmcloughlin/avo/printer"
+)
+
+// Compile pass compiles an avo file. Upon successful completion the avo file
+// may be printed to Go assembly.
+var Compile = Concat(
+	Verify,
+	FunctionPass(PruneJumpToFollowingLabel),
+	FunctionPass(PruneDanglingLabels),
+	FunctionPass(LabelTarget),
+	FunctionPass(CFG),
+	InstructionPass(ZeroExtend32BitOutputs),
+	FunctionPass(Liveness),
+	FunctionPass(AllocateRegisters),
+	FunctionPass(BindRegisters),
+	FunctionPass(VerifyAllocation),
+	FunctionPass(EnsureBasePointerCalleeSaved),
+	Func(IncludeTextFlagHeader),
+	FunctionPass(PruneSelfMoves),
+	FunctionPass(RequiredISAExtensions),
+)
+
+// Interface for a processing pass.
+type Interface interface {
+	Execute(*ir.File) error
+}
+
+// Func adapts a function to the pass Interface.
+type Func func(*ir.File) error
+
+// Execute calls p.
+func (p Func) Execute(f *ir.File) error {
+	return p(f)
+}
+
+// FunctionPass is a convenience for implementing a full file pass with a
+// function that operates on each avo Function independently.
+type FunctionPass func(*ir.Function) error
+
+// Execute calls p on every function in the file. Exits on the first error.
+func (p FunctionPass) Execute(f *ir.File) error {
+	for _, fn := range f.Functions() {
+		if err := p(fn); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// InstructionPass is a convenience for implementing a full file pass with a
+// function that operates on each Instruction independently.
+type InstructionPass func(*ir.Instruction) error
+
+// Execute calls p on every instruction in the file. Exits on the first error.
+func (p InstructionPass) Execute(f *ir.File) error {
+	for _, fn := range f.Functions() {
+		for _, i := range fn.Instructions() {
+			if err := p(i); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// Concat returns a pass that executes the given passes in order, stopping on the first error.
+func Concat(passes ...Interface) Interface {
+	return Func(func(f *ir.File) error {
+		for _, p := range passes {
+			if err := p.Execute(f); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}
+
+// Output pass prints a file.
+type Output struct {
+	Writer  io.WriteCloser
+	Printer printer.Printer
+}
+
+// Execute prints f with the configured Printer and writes output to Writer.
+func (o *Output) Execute(f *ir.File) error {
+	b, err := o.Printer.Print(f)
+	if err != nil {
+		return err
+	}
+	if _, err = o.Writer.Write(b); err != nil {
+		return err
+	}
+	return o.Writer.Close()
+}