Difference between revisions of "NuPlusFrameLowering class"
From NaplesPU Documentation
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The NuPlusFrameLowering class must handle all the operations concerning the stack frame. It implements the '''TargetFrameLowering''' interface. | The NuPlusFrameLowering class must handle all the operations concerning the stack frame. It implements the '''TargetFrameLowering''' interface. | ||
In nu+ the stack grows incrementing the address (i.e. the stack grows down) and it is 64-byte aligned. | In nu+ the stack grows incrementing the address (i.e. the stack grows down) and it is 64-byte aligned. | ||
Latest revision as of 15:33, 16 October 2017
The NuPlusFrameLowering class must handle all the operations concerning the stack frame. It implements the TargetFrameLowering interface. In nu+ the stack grows incrementing the address (i.e. the stack grows down) and it is 64-byte aligned. The NuPlusFrameLowering implements the following functions:
- emitPrologue and emitEpilogue, which insert prolog and epilog code into the function.
- eliminateCallFramePseudoInstr, responsible for eliminating call frame setup and destroy pseudo instructions, replacing them with concrete instructions.
- hasReservedCallFrame, returns true if the prologue inserter should reserve space for outgoing arguments.
- hasFP, returns true if the specified function should have a dedicated frame pointer register. This is true if the function has variable sized allocas or if frame pointer elimination is disabled.
- determineCalleeSaves, determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.
