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Code Generation

Code Generation. Gülfem Savrun Yeniçeri CS 142 (b) 02/26/2013. Code Generation. Translates intermediate representation into machine code Generated code is target specific x86 ARM. Code Generation. . class file. Parser. SSA Generator. Optimizations. Register Allocator.

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Code Generation

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  1. Code Generation GülfemSavrun Yeniçeri CS 142 (b) 02/26/2013

  2. Code Generation • Translates intermediate representation into machine code • Generated code is target specific • x86 • ARM

  3. Code Generation .class file Parser SSA Generator Optimizations Register Allocator Code Generator x86 code

  4. x86 Instruction Format

  5. x86 Instruction Format • In project: • Opcode • ModR/M • Immediate

  6. X86 Instructions • Instructions can reference different operands • Immediate • Register • Memory MOV register, immediate MOV register, register MOV register, memory

  7. Calling Convention • Protocol between the caller and the callee used during a function invocation • Which registers are saved by the caller • Which registers are saved by the callee • Where parameters and return values are placed

  8. x86 Calling Convention • Caller-saved registers EAX,ECX,EDX • Callee-saved registers EBX,EDI,ESI

  9. x86 Calling Convention Caller’s frame Caller-saved registers Arguments Return address Saved frame pointer Callee-saved registers Callee’s frame

  10. x86 Calling Convention • Caller: – Saves caller-savedregisters –Pushes arguments on stack – Executes call instruction

  11. x86 Calling Convention • Callee: • Pushescaller’s frame pointer on stack – Sets up callee’s frame pointer – Saves callee-saved registers – Allocatesa frame – Startexecuting callee’s code

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