Implementing the MachineFunction class
Similar to the LLVM IR FunctionBlock
class, a MachineFunction
class contains a series of MachineBasicBlocks
classes. These MachineFunction
classes map to LLVM IR functions that are given as input to the instruction selector. In addition to a list of basic blocks, the MachineFunction
class contains the MachineConstantPool
, MachineFrameInfo
, MachineFunctionInfo
, and MachineRegisterInfo
classes.
How to do it…
Many functions are defined in the MachineFunction
class, which does specific tasks. There are also many class member objects that keep information, such as the following:
RegInfo
keeps information about each register that is in use in the function:MachineRegisterInfo *RegInfo;
MachineFrameInfo
keeps track of ...
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