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view tools/binding/llvmsample1.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 hello world sample of D LLVM module llvmsample1; import llvm.llvm; void main() { // create module auto m = new Module("sample1"); scope(exit) m.dispose(); // declare string auto chello = ConstantArray.GetString("Hello World!\n", true); auto hello = m.addGlobal(chello.type, "hellostring"); hello.initializer = chello; hello.linkage = Linkage.Internal; hello.globalConstant = true; // declare printf auto printfType = FunctionType.Get(Type.Int32, [ PointerType.Get(Type.Int8) ], true); auto llprintf = m.addFunction(printfType, "printf"); // declare main auto mainType = FunctionType.Get(Type.Int32, null); auto llmain = m.addFunction(mainType, "main"); // create builder auto b = new Builder; scope(exit) b.dispose(); // create main body block auto bb = llmain.appendBasicBlock("entry"); b.positionAtEnd(bb); // call printf auto zero = ConstantInt.GetU(Type.Int32, 0); auto helloptr = b.buildGEP(hello, [ zero, zero ], "str"); helloptr.dump(); auto args = [ helloptr ]; auto call = b.buildCall(llprintf, args, ""); // return 0 b.buildRet(ConstantInt.GetS(Type.Int32, 0)); // write bitcode m.writeBitcodeToFile("sample1.bc"); }