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Introduce a limit on the depth of the template instantiation backtrace

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we will print with each error that occurs during template
instantiation. When the backtrace is longer than that, we will print
N/2 of the innermost backtrace entries and N/2 of the outermost
backtrace entries, then skip the middle entries with a note such as:

  note: suppressed 2 template instantiation contexts; use
  -ftemplate-backtrace-limit=N to change the number of template
  instantiation entries shown

This should eliminate some excessively long backtraces that aren't
providing any value.

llvm-svn: 101882
This commit is contained in:
Douglas Gregor
2010-04-20 07:18:24 +00:00
parent 5debc33168
commit ffed1cb339
12 changed files with 71 additions and 8 deletions
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7
clang/lib/Frontend/CompilerInvocation.cpp
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@@ -240,6 +240,11 @@ static void DiagnosticOptsToArgs(const DiagnosticOptions &Opts,
Res.push_back("-ferror-limit");
Res.push_back(llvm::utostr(Opts.ErrorLimit));
}
if (Opts.TemplateBacktraceLimit != 10) {
Res.push_back("-ftemplate-backtrace-limit");
Res.push_back(llvm::utostr(Opts.TemplateBacktraceLimit));
}
if (Opts.TabStop != DiagnosticOptions::DefaultTabStop) {
Res.push_back("-ftabstop");
Res.push_back(llvm::utostr(Opts.TabStop));
@@ -857,6 +862,8 @@ static void ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
Opts.BinaryOutput = Args.hasArg(OPT_fdiagnostics_binary);
Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
Opts.TemplateBacktraceLimit
= getLastArgIntValue(Args, OPT_ftemplate_backtrace_limit, 0, Diags);
Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
DiagnosticOptions::DefaultTabStop, Diags);
if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {