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Add a reverse iterator to DeclStmt, and use it when building a CFG. 

The CFG creates dummy DeclStmts with one Decl per statement, and it has
to do so from last to first in order to build the graph correctly.

llvm-svn: 160560
This commit is contained in:
Jordan Rose 2012-07-20 18:50:48 +00:00
parent c8b8c49d6f
commit 8c6c8a98b6
2 changed files with 12 additions and 5 deletions
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8
clang/include/clang/AST/Stmt.h
View File

@ -500,6 +500,14 @@ public:
decl_iterator decl_end() { return DG.end(); }
const_decl_iterator decl_begin() const { return DG.begin(); }
const_decl_iterator decl_end() const { return DG.end(); }
typedef std::reverse_iterator<decl_iterator> reverse_decl_iterator;
reverse_decl_iterator decl_rbegin() {
return reverse_decl_iterator(decl_end());
}
reverse_decl_iterator decl_rend() {
return reverse_decl_iterator(decl_begin());
}
};
/// NullStmt - This is the null statement ";": C99 6.8.3p3.

9
clang/lib/Analysis/CFG.cpp
View File

@ -1527,11 +1527,10 @@ CFGBlock *CFGBuilder::VisitDeclStmt(DeclStmt *DS) {
CFGBlock *B = 0;
// FIXME: Add a reverse iterator for DeclStmt to avoid this extra copy.
typedef SmallVector<Decl*,10> BufTy;
BufTy Buf(DS->decl_begin(), DS->decl_end());
for (BufTy::reverse_iterator I = Buf.rbegin(), E = Buf.rend(); I != E; ++I) {
// Build an individual DeclStmt for each decl.
for (DeclStmt::reverse_decl_iterator I = DS->decl_rbegin(),
E = DS->decl_rend();
I != E; ++I) {
// Get the alignment of the new DeclStmt, padding out to >=8 bytes.
unsigned A = llvm::AlignOf<DeclStmt>::Alignment < 8
? 8 : llvm::AlignOf<DeclStmt>::Alignment;