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Allocate objects on the stack if they (a) don't have a destructor, and

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(b) don't override the delete operator (on top of the regular conditions for
stack allocation that also apply to arrays, structs, etc.).
The "no destructor" clause is not strictly necessary, but calling them at the
right time would be tricky to say the least; it would involve, among other
things, "manually" inserting a try-finally block around anything that might
throw exceptions not caught in the current function.

Note: objects with custom new operators are automatically ignored because they
don't use the regular allocation runtime call, so there's no need to pay special
attention to them.
This commit is contained in:
Frits van Bommel
2009-05-09 00:50:15 +02:00
parent adf1fd4d44
commit 5b82f780f8
3 changed files with 88 additions and 0 deletions
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24
ir/irclass.cpp
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@@ -11,6 +11,7 @@
#include "gen/llvmhelpers.h"
#include "gen/utils.h"
#include "gen/arrays.h"
#include "gen/metadata.h"
#include "ir/irstruct.h"
#include "ir/irtypeclass.h"
@@ -70,6 +71,29 @@ LLGlobalVariable * IrStruct::getClassInfoSymbol()
classInfo = new llvm::GlobalVariable(
tc->getPA().get(), false, _linkage, NULL, initname, gIR->module);
#ifdef USE_METADATA
// Generate some metadata on this ClassInfo if it's for a class.
ClassDeclaration* classdecl = aggrdecl->isClassDeclaration();
if (classdecl && !aggrdecl->isInterfaceDeclaration()) {
// Gather information
const LLType* type = DtoType(aggrdecl->type);
const LLType* bodyType = llvm::cast<LLPointerType>(type)->getElementType();
bool hasDestructor = (classdecl->dtor != NULL);
bool hasCustomDelete = (classdecl->aggDelete != NULL);
// Construct the fields
LLConstant* mdVals[CD_NumFields];
mdVals[CD_BodyType] = llvm::UndefValue::get(bodyType);
mdVals[CD_Finalize] = LLConstantInt::get(LLType::Int1Ty, hasDestructor);
mdVals[CD_CustomDelete] = LLConstantInt::get(LLType::Int1Ty, hasCustomDelete);
// Construct the metadata
llvm::MDNode* metadata = llvm::MDNode::get(mdVals, CD_NumFields);
// Insert it into the module
new llvm::GlobalVariable(metadata->getType(), true,
METADATA_LINKAGE_TYPE, metadata, CD_PREFIX + initname, gIR->module);
}
#endif
return classInfo;
}