Allow getting all source locations of selector identifiers in a ObjCMessageExpr.
Instead of always storing all source locations for the selector identifiers
we check whether all the identifiers are in a "standard" position; "standard" position is
-Immediately before the arguments: [foo first:1 second:2]
-With a space between the arguments: [foo first: 1 second: 2]
-For nullary selectors, immediately before ']': [foo release]
In such cases we infer the locations instead of storing them.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140987 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/SelectorLocationsKind.cpp b/lib/AST/SelectorLocationsKind.cpp
new file mode 100644
index 0000000..cafb105
--- /dev/null
+++ b/lib/AST/SelectorLocationsKind.cpp
@@ -0,0 +1,102 @@
+//===--- SelectorLocationsKind.cpp - Kind of selector locations -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Describes whether the identifier locations for a selector are "standard"
+// or not.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/SelectorLocationsKind.h"
+#include "clang/AST/Expr.h"
+
+using namespace clang;
+
+static SourceLocation getStandardSelLoc(unsigned Index,
+ Selector Sel,
+ bool WithArgSpace,
+ SourceLocation ArgLoc,
+ SourceLocation EndLoc) {
+ unsigned NumSelArgs = Sel.getNumArgs();
+ if (NumSelArgs == 0) {
+ assert(Index == 0);
+ if (EndLoc.isInvalid())
+ return SourceLocation();
+ IdentifierInfo *II = Sel.getIdentifierInfoForSlot(0);
+ unsigned Len = II ? II->getLength() : 0;
+ return EndLoc.getLocWithOffset(-Len);
+ }
+
+ assert(Index < NumSelArgs);
+ if (ArgLoc.isInvalid())
+ return SourceLocation();
+ IdentifierInfo *II = Sel.getIdentifierInfoForSlot(Index);
+ unsigned Len = /* selector id */ (II ? II->getLength() : 0) + /* ':' */ 1;
+ if (WithArgSpace)
+ ++Len;
+ return ArgLoc.getLocWithOffset(-Len);
+}
+
+namespace {
+
+template <typename T>
+SourceLocation getArgLoc(T* Arg);
+
+template <>
+SourceLocation getArgLoc<Expr>(Expr *Arg) {
+ return Arg->getLocStart();
+}
+
+template <typename T>
+SourceLocation getArgLoc(unsigned Index, ArrayRef<T*> Args) {
+ return Index < Args.size() ? getArgLoc(Args[Index]) : SourceLocation();
+}
+
+template <typename T>
+SelectorLocationsKind hasStandardSelLocs(Selector Sel,
+ ArrayRef<SourceLocation> SelLocs,
+ ArrayRef<T *> Args,
+ SourceLocation EndLoc) {
+ // Are selector locations in standard position with no space between args ?
+ unsigned i;
+ for (i = 0; i != SelLocs.size(); ++i) {
+ if (SelLocs[i] != getStandardSelectorLoc(i, Sel, /*WithArgSpace=*/false,
+ Args, EndLoc))
+ break;
+ }
+ if (i == SelLocs.size())
+ return SelLoc_StandardNoSpace;
+
+ // Are selector locations in standard position with space between args ?
+ for (i = 0; i != SelLocs.size(); ++i) {
+ if (SelLocs[i] != getStandardSelectorLoc(i, Sel, /*WithArgSpace=*/true,
+ Args, EndLoc))
+ return SelLoc_NonStandard;
+ }
+
+ return SelLoc_StandardWithSpace;
+}
+
+} // anonymous namespace
+
+SelectorLocationsKind
+clang::hasStandardSelectorLocs(Selector Sel,
+ ArrayRef<SourceLocation> SelLocs,
+ ArrayRef<Expr *> Args,
+ SourceLocation EndLoc) {
+ return hasStandardSelLocs(Sel, SelLocs, Args, EndLoc);
+}
+
+SourceLocation clang::getStandardSelectorLoc(unsigned Index,
+ Selector Sel,
+ bool WithArgSpace,
+ ArrayRef<Expr *> Args,
+ SourceLocation EndLoc) {
+ return getStandardSelLoc(Index, Sel, WithArgSpace,
+ getArgLoc(Index, Args), EndLoc);
+}