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Rename TypeOfExpr / TypeOfInst to MetatypeExpr / MetatypeInst.

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Introduce a '.metatype' form in the syntax and do some basic
type-checking that I probably haven't done right.  Change
IR-generation for that and GetMetatypeExpr to use code that
actually honors the dynamic type of an expression.

Swift SVN r3053
This commit is contained in:
John McCall
2012-10-24 07:54:23 +00:00
parent a6a2ab92b3
commit 2f8f05615e
24 changed files with 189 additions and 75 deletions
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14
lib/IRGen/GenMeta.cpp
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@@ -1194,9 +1194,10 @@ llvm::Value *irgen::emitArgumentWitnessTableRef(IRGenFunction &IGF,
llvm_unreachable("bad decl kind!");
}
/// Given a heap pointer, load the metadata reference.
/// Given a heap pointer, load the metadata reference as a %type*.
llvm::Value *irgen::emitMetadataRefForHeapObject(IRGenFunction &IGF,
llvm::Value *object) {
llvm::Value *object,
bool suppressCast) {
// Drill into the object pointer. Rather than bitcasting, we make
// an effort to do something that should explode if we get something
// mistyped.
@@ -1208,7 +1209,7 @@ llvm::Value *irgen::emitMetadataRefForHeapObject(IRGenFunction &IGF,
// We need a bitcast if we're dealing with an opaque class.
if (structTy->isOpaque()) {
auto metadataPtrPtrTy = IGF.IGM.HeapMetadataPtrTy->getPointerTo();
auto metadataPtrPtrTy = IGF.IGM.TypeMetadataPtrTy->getPointerTo();
slot = IGF.Builder.CreateBitCast(object, metadataPtrPtrTy);
// Otherwise, make a GEP.
@@ -1227,6 +1228,11 @@ llvm::Value *irgen::emitMetadataRefForHeapObject(IRGenFunction &IGF,
} while (structTy != nullptr);
slot = IGF.Builder.CreateInBoundsGEP(object, indexes);
if (!suppressCast) {
slot = IGF.Builder.CreateBitCast(slot,
IGF.IGM.TypeMetadataPtrTy->getPointerTo());
}
}
auto metadata = IGF.Builder.CreateLoad(Address(slot,
@@ -1308,7 +1314,7 @@ Callee irgen::emitVirtualCallee(IRGenFunction &IGF, llvm::Value *base,
if (method->isStatic()) {
metadata = base;
} else {
metadata = emitMetadataRefForHeapObject(IGF, base);
metadata = emitMetadataRefForHeapObject(IGF, base, /*suppress cast*/ true);
}
// Use the type of the method we were type-checked against, not the