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IR: Extract macros from DILocation, NFC 

`DILocation` is a lightweight wrapper.  Its accessors check for null and
the correct type, and then forward to `MDLocation`.

Extract a couple of macros to do the `dyn_cast_or_null<>` and default
return logic.  I'll be using these to minimize error-prone boilerplate
when I move the new hierarchy into place -- since all the other
subclasses of `DIDescriptor` will similarly become lightweight wrappers.

(Note that I hope to obsolete these wrappers fairly quickly, with the
goal of renaming the underlying types (e.g., I'll rename `MDLocation` to
`DILocation` once the name is free).)

llvm-svn: 229953
This commit is contained in:
Duncan P. N. Exon Smith 2015-02-20 02:28:49 +00:00
parent 301ed0c3b4
commit f86505abdf
1 changed files with 20 additions and 16 deletions
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36
llvm/include/llvm/IR/DebugInfo.h
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@ -252,6 +252,19 @@ public:
void replaceAllUsesWith(MDNode *D);
};
#define RETURN_FROM_RAW(VALID, DEFAULT) \
do { \
if (auto *N = getRaw()) \
return VALID; \
return DEFAULT; \
} while (false)
#define RETURN_DESCRIPTOR_FROM_RAW(DESC, VALID) \
do { \
if (auto *N = getRaw()) \
return DESC(dyn_cast_or_null<MDNode>(VALID)); \
return DESC(static_cast<const MDNode *>(nullptr)); \
} while (false)
/// \brief This is used to represent ranges, for array bounds.
class DISubrange : public DIDescriptor {
friend class DIDescriptor;
@ -933,25 +946,13 @@ class DILocation : public DIDescriptor {
public:
explicit DILocation(const MDNode *N) : DIDescriptor(N) {}
unsigned getLineNumber() const {
if (auto *L = getRaw())
return L->getLine();
return 0;
}
unsigned getColumnNumber() const {
if (auto *L = getRaw())
return L->getColumn();
return 0;
}
unsigned getLineNumber() const { RETURN_FROM_RAW(N->getLine(), 0); }
unsigned getColumnNumber() const { RETURN_FROM_RAW(N->getColumn(), 0); }
DIScope getScope() const {
if (auto *L = getRaw())
return DIScope(dyn_cast_or_null<MDNode>(L->getScope()));
return DIScope(nullptr);
RETURN_DESCRIPTOR_FROM_RAW(DIScope, N->getScope());
}
DILocation getOrigLocation() const {
if (auto *L = getRaw())
return DILocation(dyn_cast_or_null<MDNode>(L->getInlinedAt()));
return DILocation(nullptr);
RETURN_DESCRIPTOR_FROM_RAW(DILocation, N->getInlinedAt());
}
StringRef getFilename() const { return getScope().getFilename(); }
StringRef getDirectory() const { return getScope().getDirectory(); }
@ -1042,6 +1043,9 @@ public:
bool Verify() const;
};
#undef RETURN_FROM_RAW
#undef RETURN_DESCRIPTOR_FROM_RAW
/// \brief Find subprogram that is enclosing this scope.
DISubprogram getDISubprogram(const MDNode *Scope);