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Add support to create local variable's debug info.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121211 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2010-12-07 23:58:00 +00:00
parent 0584316dfb
commit 48f17ba2a6
2 changed files with 52 additions and 0 deletions
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19
include/llvm/Analysis/DIBuilder.h
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@ -188,6 +188,25 @@ namespace llvm {
DIType Ty, bool isLocalToUnit, llvm::Value *Val);
/// CreateLocalVariable - Create a new descriptor for the specified
/// local variable.
/// @param Tag Dwarf TAG. Usually DW_TAG_auto_variable or
/// DW_TAG_arg_variable.
/// @param Scope Variable scope.
/// @param Name Variable name.
/// @param File File where this variable is defined.
/// @param LineNo Line number.
/// @param Ty Variable Type
/// @param AlwaysPreserve Boolean. Set to true if debug info for this
/// variable should be preserved in optimized build.
/// @param Flags Flags, e.g. artificial variable.
DIVariable CreateLocalVariable(unsigned Tag, DIDescriptor Scope,
StringRef Name,
DIFile File, unsigned LineNo,
DIType Ty, bool AlwaysPreserve = false,
unsigned Flags = 0);
/// CreateComplexVariable - Create a new descriptor for the specified
/// variable which has a complex address expression for its address.
/// @param Tag Dwarf TAG. Usually DW_TAG_auto_variable or

33
lib/Analysis/DIBuilder.cpp
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@ -27,6 +27,7 @@ static Constant *GetTagConstant(LLVMContext &VMContext, unsigned Tag) {
"Tag too large for debug encoding!");
return ConstantInt::get(Type::getInt32Ty(VMContext), Tag | LLVMDebugVersion);
}
DIBuilder::DIBuilder(Module &m)
: M(m), VMContext(M.getContext()), TheCU(0), DeclareFn(0), ValueFn(0) {}
@ -368,6 +369,38 @@ CreateStaticVariable(DIDescriptor Context, StringRef Name,
return DIGlobalVariable(Node);
}
/// CreateVariable - Create a new descriptor for the specified variable.
DIVariable DIBuilder::CreateLocalVariable(unsigned Tag, DIDescriptor Scope,
StringRef Name, DIFile File,
unsigned LineNo, DIType Ty,
bool AlwaysPreserve, unsigned Flags) {
Value *Elts[] = {
GetTagConstant(VMContext, Tag),
Scope,
MDString::get(VMContext, Name),
File,
ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
Ty,
ConstantInt::get(Type::getInt32Ty(VMContext), Flags)
};
MDNode *Node = MDNode::get(VMContext, &Elts[0], array_lengthof(Elts));
if (AlwaysPreserve) {
// The optimizer may remove local variable. If there is an interest
// to preserve variable info in such situation then stash it in a
// named mdnode.
DISubprogram Fn(getDISubprogram(Scope));
StringRef FName = "fn";
if (Fn.getFunction())
FName = Fn.getFunction()->getName();
char One = '\1';
if (FName.startswith(StringRef(&One, 1)))
FName = FName.substr(1);
NamedMDNode *FnLocals = getOrInsertFnSpecificMDNode(M, FName);
FnLocals->addOperand(Node);
}
return DIVariable(Node);
}
/// CreateComplexVariable - Create a new descriptor for the specified variable
/// which has a complex address expression for its address.
DIVariable DIBuilder::CreateComplexVariable(unsigned Tag, DIDescriptor Scope,