79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
package core
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import (
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"git.akyoto.dev/cli/q/src/build/asm"
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"git.akyoto.dev/cli/q/src/build/ast"
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"git.akyoto.dev/cli/q/src/build/cpu"
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"git.akyoto.dev/cli/q/src/build/errors"
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"git.akyoto.dev/cli/q/src/build/expression"
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"git.akyoto.dev/cli/q/src/build/token"
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)
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// ExpressionToRegister puts the result of an expression into the specified register.
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func (f *Function) ExpressionToRegister(node *expression.Expression, register cpu.Register) error {
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if node.IsFolded {
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f.SaveRegister(register)
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f.RegisterNumber(asm.MOVE, register, node.Value)
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return nil
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}
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if node.IsLeaf() {
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return f.TokenToRegister(node.Token, register)
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}
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if ast.IsFunctionCall(node) {
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err := f.CompileCall(node)
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if register != f.CPU.Output[0] {
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f.SaveRegister(register)
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f.RegisterRegister(asm.MOVE, register, f.CPU.Output[0])
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}
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return err
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}
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if node.Token.Kind == token.Array {
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array := f.VariableByName(node.Children[0].Token.Text(f.File.Bytes))
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offset, err := f.Number(node.Children[1].Token)
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f.MemoryRegister(asm.LOAD, asm.Memory{Base: array.Register, Offset: byte(offset), Length: 1}, register)
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return err
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}
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if len(node.Children) == 1 {
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if !node.Token.IsUnaryOperator() {
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return errors.New(errors.MissingOperand, f.File, node.Token.End())
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}
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err := f.ExpressionToRegister(node.Children[0], register)
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if err != nil {
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return err
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}
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return f.ExecuteRegister(node.Token, register)
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}
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left := node.Children[0]
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right := node.Children[1]
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final := register
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if f.UsesRegister(right, register) {
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register = f.NewRegister()
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}
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err := f.ExpressionToRegister(left, register)
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if err != nil {
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return err
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}
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err = f.Execute(node.Token, register, right)
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if register != final {
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f.SaveRegister(final)
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f.RegisterRegister(asm.MOVE, final, register)
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f.FreeRegister(register)
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}
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return err
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}
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