Difference between revisions of "NuPlusFrameLowering class"
From NaplesPU Documentation
(Created page with "The NuPlusFrameLowering class must handle all the operations concerning the stack frame. It implements the '''TargetFrameLowering''' interface. In nu+ the stack grows increme...") |
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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. | ||
The NuPlusFrameLowering implements the following functions: | The NuPlusFrameLowering implements the following functions: | ||
| − | *emitPrologue and emitEpilogue, which insert prolog and epilog code into the function. | + | *'''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. | + | *'''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. | + | *'''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. | + | *'''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. | + | *'''determineCalleeSaves''', determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved. |
Revision as of 12:32, 13 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.
