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view tools/binding/llvmsample3.d @ 1410:cc2d8a7388c7
Count the sret register as well when keeping track of how many integer registers
are available for extern(C) functions on x86-64.
Interestingly, llvm-g++ seems to have a very similar bug: http://llvm.org/pr4242
(So this breaks ABI-compatibility with llvm-gcc for this corner case, but gains
it with gcc...)
To clarify, this is about code like this:
{{{
struct S { void*[3] data; }
struct T { void*[2] data; }
// The T should be passed in memory, and p in the last int register.
extern(C) S fail(int, int, int, int, T t, void* p) {
S s;
s.data[0] = t.data[0];
s.data[1] = t.data[1];
s.data[2] = p;
return s;
}
}}}
which should generate code functionally equivalent to this:
{{{
extern(C) S* succeed(S* s, int, int, int, int, T t, void* p) {
s.data[0] = t.data[0];
s.data[1] = t.data[1];
s.data[2] = p;
return s;
}
}}}
(with the same definitions for S and T)
author | Frits van Bommel <fvbommel wxs.nl> |
---|---|
date | Fri, 22 May 2009 13:17:06 +0200 |
parents | 1ba61de8796b |
children |
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// simple example that shows off getting D wrappers from C values. module llvmsample3; import llvm.c.Core; import llvm.llvm; void main() { auto m = new Module("sample3"); // global int32 auto gi = m.addGlobal(Type.Int32, "myint"); gi.initializer = ConstantInt.GetU(Type.Int32, 42); // this is not a cached value, it's recreated dynamically auto _i = gi.initializer; auto ci = cast(ConstantInt)_i; assert(ci !is null); ci.dump; // global struct auto st = StructType.Get([Type.Double,Type.Double,Type.Double]); auto gs = m.addGlobal(st, "mystruct"); auto elems = new Constant[3]; foreach(i,ref e; elems) e = ConstantReal.Get(Type.Double, i+1); gs.initializer = ConstantStruct.Get(elems); // again this is not a cached value. auto s = gs.initializer; auto cs = cast(ConstantStruct)s; assert(cs !is null); cs.dump; }