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This was simple enough, we just needed to change the part where we
were computing the offset for each field, and the total size of the
compound structure.
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Structs for now (and probably for the near future) are not allowed
to be passed by value, and instead you just pass a pointer to it.
Nested structs can also be defined, and they can be either anonymous,
or named (in which case only the members can access the type).
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`putc`, `puts`, and `putnum` in `std/common.cup` are now implemented
in terms of the `write()` syscall.
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This design should also be useful for structs down the road.
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This commit does a few things in one go:
- Add support for a `char` type + some changes to support the new size
- Add support for character literals. We need some escaping here to be
able to use `\n` and `\0`, etc.
- Add support for string literals. These are all stored in the `.data`
section. Fortunately NASM already handles the escape characters.
- Fix some bugs with code generation, specifically using `movsx` to sign
extend the smaller types into 64-bit registers.
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Usual disclaimer at this point: Quick&Dirty implementation, hasn't
been tested other than basic sanity checks. Arrays are automatically
decayed into pointers when the identifier is accessed.
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It was getting a bit unwieldy in `parser.c`, and this will potentially
help when we start dealing with more complex type-stuff such as
casting / conversions / etc.
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