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It is handy to express when
the end of a block cannot be
reached. If a hlt terminator
is executed, it traps the
program.
We don't go the llvm way and
specify execution semantics as
undefined behavior.
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Symbols are a useful abstraction
that occurs in both Con and Alias.
In this patch they get their own
struct. This new struct packages
a symbol name and a type; the type
tells us where the symbol name
must be interpreted (currently, in
gobal memory or in thread-local
storage).
The refactor fixed a bug in
addcon(), proving the value of
packaging symbol names with their
type.
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The apple targets are not done yet.
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The general idea is to give abis a
chance to talk before we've done all
the optimizations. Currently, all
targets eliminate {par,arg,ret}{sb,ub,...}
during this pass. The forthcoming
arm64_apple will, however, insert
proper extensions during abi0.
Moving forward abis can, for example,
lower small-aggregates passing there
so that memory optimizations can
interact better with function calls.
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apple support is more than assembly syntax
in case of arm64 machines, and apple syntax
is currently useless in all cases but amd64;
rather than having a -G option that only
makes sense with amd64, we add a new target
amd64_apple
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The recent changes in arm and riscv
typclass() set ngp to 1 when a struct
is returned via a caller-provided
buffer. This interacts bogusly with
selret() that ends up declaring a gp
register live when none is set in
the returning sequence.
The fix is simply to set cty to zero
(all registers dead) in case a caller-
provided buffer is used.
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I also moved some isel logic
that would have been repeated
a third time in util.c.
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Many things got fixed, but the most
notable change is the proper support
of floating point types in aggregates.
Minor fixes:
- selpar() did not deal correctly
with Cfpint
- typclass() was reading out of
bounds in the gp/fp arrays
- support for env calls
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The risc-v abi needs to know if a
type is defined as a union or not.
We cannot use nunion to obtain this
information because the risc-v abi
made the unfortunate decision of
treating
union { int i; }
differently from
int i;
So, instead, I introduce a single
bit flag 'isunion'.
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It is mostly complete, but still has a few ABI bugs when passing
floats in structs, or when structs are passed partly in register,
and partly on stack.
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