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LLVM IR

Assemble. LLVM IR. LLVM IR. Object File. DAG Lowering. Assembly File. Object File Writer. SDNode. DAG of Target Operation (might be illegal). Assembly Printer. Legalization. Machine Code Layer ( MCInst ). DAG of Target Operation (legal). MCInst. MC Lowering.

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LLVM IR

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  1. Assemble LLVM IR LLVM IR Object File DAG Lowering Assembly File Object File Writer SDNode DAG of Target Operation (might be illegal) Assembly Printer Legalization Machine Code Layer (MCInst) DAG of Target Operation (legal) MCInst MCLowering Instruction Selection DAG of Machine Instructions Sequence of Machine Instructions Scheduling and Formation Prolog/Epilog Code Insertion MachineInstr Sequence of Machine Instructions Register Allocation Sequence of Machine Instructions SSA-based Machine Code Optimization

  2. LLVM IR DAG of Target Operation (might be illegal) DAG of Target Operation (might be illegal) DAG of Target Operation (legal) DAG of Target Operation (legal) DAG of Machine Instructions DAG of Machine Instructions Sequence of Machine Instructions Sequence of Machine Instructions Machine Code Layer (MCInst)

  3. Module Function LLVM IR Basic Block

  4. LLVM IR MachineInstr Assembly Parsing MCInst (MC Layer) Assembly Printer Decode Object File Writer Assembly File Object File Assemble Disassemble

  5. SSA Form & Infinite Virtual Register Phi Node

  6. Assembly (.s) Code (.c) Code (.c) Code (.c) Object (.o) Assembler Parser Code Generator Code Generator Code Generator Disassembler MCInst MCStreamer Object Writer MCJIT Object Writer Assembly Printer Assembly Printer Object (.o) Assembly (.s) Object (.o) Execution Assembly (.s) Compile & Assembly Assembly Compile JIT Disassembly

  7. Assembly File Source File AsmParser MC InstPrinter MC AsmStreamer & ObjectStreamer AsmPrinter & MCInstLower Code Generator MC CodeEmitter Disassembler Object File

  8. MCSection MCSection MCFragment MCFragment MCFragment

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