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start work on aggregate types

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The parser now has some code to parse the description
of structured types.

I tried to be even less specific than LLVM "type" by
creating just enough abstraction so that I can deal
with both AARCH64 and x64.  The base types used in the
definition of an aggregate are really just syntactic sugar
to give a structure a size and an alignment.  Only the
location of float components matters for the compilation.
In particular this means that the front-ends have to know
how the ABI works to pass/return small integer types.
This also means that the font-end has to be aware of the
layout of structures.

Chris Lattner has a proposition [1] for LLVM that is still
pending and goes in the direction of giving more control
of the ABI the front-end.

[1]: http://www.nondot.org/sabre/LLVMNotes/ExtendedIntegerResults.txt
This commit is contained in:
Quentin Carbonneaux 2015-09-07 21:59:45 -04:00
parent 8f2922eb1a
commit 87ab8941ed
5 changed files with 201 additions and 47 deletions
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8
lisc/isel.c
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@ -178,8 +178,8 @@ sel(Ins i, Fn *fn)
n = i.op == OStorel;
goto Emit;
case OLoad:
case OLoadss:
case OLoadus:
case OLoadsh:
case OLoaduh:
case OLoadsb:
case OLoadub:
if (cpy[0].s) {
@ -264,8 +264,8 @@ flagi(Ins *i0, Ins *i)
case OStoreb:
case OStores:
case OLoad:
case OLoadss:
case OLoadus:
case OLoadsh:
case OLoaduh:
case OLoadsb:
case OLoadub:;
}