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https://github.com/c64scene-ar/llvm-6502.git
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LLVM backend for 6502
675c967d55
When handling an incoming byval argument, we need to possibly write incoming registers to the stack in order to create an on-stack image of the parameter, so we can return its address to common code. This currently uses CreateFixedObject to access the parts of the parameter save area where the argument is (or needs to be) stored. However, sometimes we need to access multiple parts of that area, e.g. to write multiple registers. The code currently uses a new CreateFixedObject call for each of these accesses, resulting in a patchwork of overlapping (fixed) stack objects. This doesn't really matter in the case of fixed objects, since any access to those turns into a fixed stackpointer + offset address anyway. However, with the upcoming ELFv2 patches, we may actually need to place an incoming argument into our *own* stack frame instead of the caller's. This means we need to use CreateStackObject instead, and we cannot have multiple overlapping instances of those. To make the rest of the argument handling code work equally in both situations, this patch refactors it to always use just a single call to CreateFixedObject, and access parts of that object as required using address arithmetic. This way, we can in a future patch substitute CreateStackObject without further changes. No change to generated code intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213483 91177308-0d34-0410-b5e6-96231b3b80d8 |
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