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GraphViz CFGPrinter: wrap long lines.

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llvm-svn: 194496
This commit is contained in:
Andrew Trick 2013-11-12 18:06:09 +00:00
parent 9e55e72253
commit 92750f0da5
1 changed files with 19 additions and 2 deletions
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21
include/llvm/Analysis/CFGPrinter.h
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@ -46,6 +46,7 @@ struct DOTGraphTraits<const Function*> : public DefaultDOTGraphTraits {
static std::string getCompleteNodeLabel(const BasicBlock *Node,
const Function *) {
enum { MaxColumns = 80 };
std::string Str;
raw_string_ostream OS(Str);
@ -59,16 +60,32 @@ struct DOTGraphTraits<const Function*> : public DefaultDOTGraphTraits {
if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
// Process string output to make it nicer...
for (unsigned i = 0; i != OutStr.length(); ++i)
unsigned ColNum = 0;
unsigned LastSpace = 0;
for (unsigned i = 0; i != OutStr.length(); ++i) {
if (OutStr[i] == '\n') { // Left justify
OutStr[i] = '\\';
OutStr.insert(OutStr.begin()+i+1, 'l');
ColNum = 0;
LastSpace = 0;
} else if (OutStr[i] == ';') { // Delete comments!
unsigned Idx = OutStr.find('\n', i+1); // Find end of line
OutStr.erase(OutStr.begin()+i, OutStr.begin()+Idx);
--i;
} else if (ColNum == MaxColumns) { // Wrap lines.
if (LastSpace) {
OutStr.insert(LastSpace, "\\l...");
ColNum = i - LastSpace;
LastSpace = 0;
i += 3; // The loop will advance 'i' again.
}
// Else keep trying to find a space.
}
else
++ColNum;
if (OutStr[i] == ' ')
LastSpace = i;
}
return OutStr;
}