6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-24 06:25:18 +00:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

52
include/llvm/IR/DebugInfo.h
View File

@@ -150,6 +150,7 @@ public:
bool isTemplateValueParameter() const;
bool isObjCProperty() const;
bool isImportedEntity() const;
bool isExpression() const;
/// print - print descriptor.
void print(raw_ostream &OS) const;
@@ -720,20 +721,6 @@ public:
/// Verify - Verify that a variable descriptor is well formed.
bool Verify() const;
/// HasComplexAddr - Return true if the variable has a complex address.
bool hasComplexAddress() const { return getNumAddrElements() > 0; }
/// \brief Return the size of this variable's complex address or
/// zero if there is none.
unsigned getNumAddrElements() const {
if (DbgNode->getNumOperands() < 9)
return 0;
return getDescriptorField(8)->getNumOperands();
}
/// \brief return the Idx'th complex address element.
uint64_t getAddrElement(unsigned Idx) const;
/// isBlockByrefVariable - Return true if the variable was declared as
/// a "__block" variable (Apple Blocks).
bool isBlockByrefVariable(const DITypeIdentifierMap &Map) const {
@@ -744,6 +731,35 @@ public:
/// information for an inlined function arguments.
bool isInlinedFnArgument(const Function *CurFn);
/// Return the size reported by the variable's type.
unsigned getSizeInBits(const DITypeIdentifierMap &Map);
void printExtendedName(raw_ostream &OS) const;
};
/// DIExpression - A complex location expression.
class DIExpression : public DIDescriptor {
friend class DIDescriptor;
void printInternal(raw_ostream &OS) const;
public:
explicit DIExpression(const MDNode *N = nullptr) : DIDescriptor(N) {}
/// Verify - Verify that a variable descriptor is well formed.
bool Verify() const;
/// \brief Return the number of elements in the complex expression.
unsigned getNumElements() const {
if (!DbgNode)
return 0;
unsigned N = DbgNode->getNumOperands();
assert(N > 0 && "missing tag");
return N - 1;
}
/// \brief return the Idx'th complex address element.
uint64_t getElement(unsigned Idx) const;
/// isVariablePiece - Return whether this is a piece of an aggregate
/// variable.
bool isVariablePiece() const;
@@ -751,11 +767,6 @@ public:
uint64_t getPieceOffset() const;
/// getPieceSize - Return the size of this piece in bytes.
uint64_t getPieceSize() const;
/// Return the size reported by the variable's type.
unsigned getSizeInBits(const DITypeIdentifierMap &Map);
void printExtendedName(raw_ostream &OS) const;
};
/// DILocation - This object holds location information. This object
@@ -872,9 +883,6 @@ DIVariable createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
/// cleanseInlinedVariable - Remove inlined scope from the variable.
DIVariable cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext);
/// getEntireVariable - Remove OpPiece exprs from the variable.
DIVariable getEntireVariable(DIVariable DV);
/// Construct DITypeIdentifierMap by going through retained types of each CU.
DITypeIdentifierMap generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes);