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Move the complex address expression out of DIVariable and into an extra

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argument of the llvm.dbg.declare/llvm.dbg.value intrinsics.

Previously, DIVariable was a variable-length field that has an optional
reference to a Metadata array consisting of a variable number of
complex address expressions. In the case of OpPiece expressions this is
wasting a lot of storage in IR, because when an aggregate type is, e.g.,
SROA'd into all of its n individual members, the IR will contain n copies
of the DIVariable, all alike, only differing in the complex address
reference at the end.

By making the complex address into an extra argument of the
dbg.value/dbg.declare intrinsics, all of the pieces can reference the
same variable and the complex address expressions can be uniqued across
the CU, too.
Down the road, this will allow us to move other flags, such as
"indirection" out of the DIVariable, too.

The new intrinsics look like this:
declare void @llvm.dbg.declare(metadata %storage, metadata %var, metadata %expr)
declare void @llvm.dbg.value(metadata %storage, i64 %offset, metadata %var, metadata %expr)

This patch adds a new LLVM-local tag to DIExpressions, so we can detect
and pretty-print DIExpression metadata nodes.

What this patch doesn't do:

This patch does not touch the "Indirect" field in DIVariable; but moving
that into the expression would be a natural next step.

http://reviews.llvm.org/D4919
rdar://problem/17994491

Thanks to dblaikie and dexonsmith for reviewing this patch!

Note: I accidentally committed a bogus older version of this patch previously.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218787 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl
2014-10-01 18:55:02 +00:00
parent 0ad623bb0d
commit 02474a32eb
257 changed files with 1534 additions and 1377 deletions
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39
include/llvm/IR/DIBuilder.h
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@ -85,7 +85,6 @@ namespace llvm {
public:
explicit DIBuilder(Module &M);
enum ComplexAddrKind { OpPlus=1, OpDeref, OpPiece };
enum DebugEmissionKind { FullDebug=1, LineTablesOnly };
/// finalize - Construct any deferred debug info descriptors.
@ -501,33 +500,18 @@ namespace llvm {
unsigned Flags = 0,
unsigned ArgNo = 0);
/// createComplexVariable - Create a new descriptor for the specified
/// createExpression - 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
/// DW_TAG_arg_variable.
/// @param Scope Variable scope.
/// @param Name Variable name.
/// @param F File where this variable is defined.
/// @param LineNo Line number.
/// @param Ty Variable Type
/// @param Addr An array of complex address operations.
/// @param ArgNo If this variable is an argument then this argument's
/// number. 1 indicates 1st argument.
DIVariable createComplexVariable(unsigned Tag, DIDescriptor Scope,
StringRef Name, DIFile F, unsigned LineNo,
DITypeRef Ty, ArrayRef<Value *> Addr,
unsigned ArgNo = 0);
DIExpression createExpression(ArrayRef<Value *> Addr = None);
/// createVariablePiece - Create a descriptor to describe one part
/// createPieceExpression - Create a descriptor to describe one part
/// of aggregate variable that is fragmented across multiple Values.
///
/// @param Variable Variable that is partially represented by this.
/// @param OffsetInBytes Offset of the piece in bytes.
/// @param SizeInBytes Size of the piece in bytes.
DIVariable createVariablePiece(DIVariable Variable,
unsigned OffsetInBytes,
unsigned SizeInBytes);
DIExpression createPieceExpression(unsigned OffsetInBytes,
unsigned SizeInBytes);
/// createFunction - Create a new descriptor for the specified subprogram.
/// See comments in DISubprogram for descriptions of these fields.
@ -675,34 +659,37 @@ namespace llvm {
/// insertDeclare - Insert a new llvm.dbg.declare intrinsic call.
/// @param Storage llvm::Value of the variable
/// @param VarInfo Variable's debug info descriptor.
/// @param Expr A complex location expression.
/// @param InsertAtEnd Location for the new intrinsic.
Instruction *insertDeclare(llvm::Value *Storage, DIVariable VarInfo,
BasicBlock *InsertAtEnd);
DIExpression Expr, BasicBlock *InsertAtEnd);
/// insertDeclare - Insert a new llvm.dbg.declare intrinsic call.
/// @param Storage llvm::Value of the variable
/// @param VarInfo Variable's debug info descriptor.
/// @param Expr A complex location expression.
/// @param InsertBefore Location for the new intrinsic.
Instruction *insertDeclare(llvm::Value *Storage, DIVariable VarInfo,
Instruction *InsertBefore);
DIExpression Expr, Instruction *InsertBefore);
/// insertDbgValueIntrinsic - Insert a new llvm.dbg.value intrinsic call.
/// @param Val llvm::Value of the variable
/// @param Offset Offset
/// @param VarInfo Variable's debug info descriptor.
/// @param Expr A complex location expression.
/// @param InsertAtEnd Location for the new intrinsic.
Instruction *insertDbgValueIntrinsic(llvm::Value *Val, uint64_t Offset,
DIVariable VarInfo,
DIVariable VarInfo, DIExpression Expr,
BasicBlock *InsertAtEnd);
/// insertDbgValueIntrinsic - Insert a new llvm.dbg.value intrinsic call.
/// @param Val llvm::Value of the variable
/// @param Offset Offset
/// @param VarInfo Variable's debug info descriptor.
/// @param Expr A complex location expression.
/// @param InsertBefore Location for the new intrinsic.
Instruction *insertDbgValueIntrinsic(llvm::Value *Val, uint64_t Offset,
DIVariable VarInfo,
DIVariable VarInfo, DIExpression Expr,
Instruction *InsertBefore);
};
} // end namespace llvm