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Improve error message with ambiguous function overloads.

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Issue #316.
This commit is contained in:
Matt Pharr
2012-07-06 11:25:57 -07:00
parent 2d8026625b
commit 78cb45fb25
1 changed files with 27 additions and 22 deletions
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49
expr.cpp
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@@ -7656,25 +7656,27 @@ FunctionSymbolExpr::GetConstant(const Type *type) const {
}
static void
lPrintOverloadCandidates(SourcePos pos, const std::vector<Symbol *> &funcs,
const std::vector<const Type *> &argTypes,
const std::vector<bool> *argCouldBeNULL) {
for (unsigned int i = 0; i < funcs.size(); ++i) {
const FunctionType *ft = CastType<FunctionType>(funcs[i]->type);
AssertPos(pos, ft != NULL);
Error(funcs[i]->pos, "Candidate function: %s.", ft->GetString().c_str());
}
std::string passedTypes = "Passed types: (";
static std::string
lGetOverloadCandidateMessage(const std::vector<Symbol *> &funcs,
const std::vector<const Type *> &argTypes,
const std::vector<bool> *argCouldBeNULL) {
std::string message = "Passed types: (";
for (unsigned int i = 0; i < argTypes.size(); ++i) {
if (argTypes[i] != NULL)
passedTypes += argTypes[i]->GetString();
message += argTypes[i]->GetString();
else
passedTypes += "(unknown type)";
passedTypes += (i < argTypes.size()-1) ? ", " : ")\n\n";
message += "(unknown type)";
message += (i < argTypes.size()-1) ? ", " : ")\n";
}
Error(pos, "%s", passedTypes.c_str());
for (unsigned int i = 0; i < funcs.size(); ++i) {
const FunctionType *ft = CastType<FunctionType>(funcs[i]->type);
Assert(ft != NULL);
message += "Candidate: ";
message += ft->GetString();
message += "\n";
}
return message;
}
@@ -7947,20 +7949,23 @@ FunctionSymbolExpr::ResolveOverloads(SourcePos argPos,
}
else if (matches.size() > 1) {
// Multiple matches: ambiguous
std::string candidateMessage =
lGetOverloadCandidateMessage(matches, argTypes, argCouldBeNULL);
Error(pos, "Multiple overloaded functions matched call to function "
"\"%s\"%s.", funName,
exactMatchOnly ? " only considering exact matches" : "");
lPrintOverloadCandidates(argPos, matches, argTypes, argCouldBeNULL);
"\"%s\"%s.\n%s", funName,
exactMatchOnly ? " only considering exact matches" : "",
candidateMessage.c_str());
return false;
}
else {
// No matches at all
failure:
std::string candidateMessage =
lGetOverloadCandidateMessage(matches, argTypes, argCouldBeNULL);
Error(pos, "Unable to find any matching overload for call to function "
"\"%s\"%s.", funName,
exactMatchOnly ? " only considering exact matches" : "");
lPrintOverloadCandidates(argPos, candidateFunctions, argTypes,
argCouldBeNULL);
"\"%s\"%s.\n%s", funName,
exactMatchOnly ? " only considering exact matches" : "",
candidateMessage.c_str());
return false;
}
}