use efficient form of getSpelling, this speeds up -dM by 16%.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64244 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/PrintPreprocessedOutput.cpp b/Driver/PrintPreprocessedOutput.cpp
index 8bd4e96..7aceb7a 100644
--- a/Driver/PrintPreprocessedOutput.cpp
+++ b/Driver/PrintPreprocessedOutput.cpp
@@ -582,11 +582,19 @@
if (MI.tokens_empty() || !MI.tokens_begin()->hasLeadingSpace())
OS << ' ';
+ llvm::SmallVector<char, 128> SpellingBuffer;
+
for (MacroInfo::tokens_iterator I = MI.tokens_begin(), E = MI.tokens_end();
I != E; ++I) {
if (I->hasLeadingSpace())
OS << ' ';
- OS << PP.getSpelling(*I);
+
+ // Make sure we have enough space in the spelling buffer.
+ if (I->getLength() < SpellingBuffer.size())
+ SpellingBuffer.resize(I->getLength());
+ const char *Buffer = &SpellingBuffer[0];
+ unsigned SpellingLen = PP.getSpelling(*I, Buffer);
+ OS.write(Buffer, SpellingLen);
}
OS << "\n";
}