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35 lines
1.3 KiB
35 lines
1.3 KiB
import type { RegAlloc } from '../regalloc'
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import { AbsInsn2, CopyInsn, GotoInsn, insnReduce2, LabelInsn, Operand, UnaryInsn } from '../ir/insn'
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import { Loc, LocType } from '../ir/loc'
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import { UnaryOp, BinaryOp } from '../ast'
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export const allocate = (alloc: RegAlloc, block: Array<AbsInsn2>): Array<AbsInsn2> =>
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block.map(insn => allocateInsn(alloc, insn))
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export const allocateInsn = (alloc: RegAlloc, insn: AbsInsn2): AbsInsn2 => insnReduce2<AbsInsn2>(
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(dest: Loc, source: Operand) => CopyInsn(
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allocateInsnDest(alloc, dest),
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typeof source === 'number' ? source : allocateInsnDest(alloc, source),
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),
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(name: string) => LabelInsn(name),
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(name: string) => GotoInsn(name),
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(dest: Loc, op: UnaryOp | BinaryOp, source: Operand) => UnaryInsn(
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allocateInsnDest(alloc, dest),
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op,
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typeof source === 'number' ? source : allocateInsnDest(alloc, source),
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),
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insn,
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)
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export const allocateInsnDest = (alloc: RegAlloc, loc: Loc): Loc =>
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loc.type === LocType.TEMPORARY
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? lookupAllocation(alloc, loc.ppName())
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: loc
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const lookupAllocation = (alloc: RegAlloc, name: string): Loc => {
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const loc = alloc[name]
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if (typeof loc === 'object') {
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throw new Error('stack offsets not supported yet')
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}
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return Loc.reg(loc)
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}
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