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diagnose targets that define two alises with the same 'from' mnemonic

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with a useful error message instead of having tblgen explode with an 
assert.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117827 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-10-30 18:56:12 +00:00
parent 7fd4489de1
commit 4fd32c6648
1 changed files with 30 additions and 5 deletions
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35
utils/TableGen/AsmMatcherEmitter.cpp
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@ -1524,14 +1524,39 @@ static bool EmitMnemonicAliases(raw_ostream &OS) {
Records.getAllDerivedDefinitions("MnemonicAlias");
if (Aliases.empty()) return false;
std::vector<StringMatcher::StringPair> Cases;
// Keep track of all the aliases from a mnemonic. Use an std::map so that the
// iteration order of the map is stable.
std::map<std::string, std::vector<Record*> > AliasesFromMnemonic;
for (unsigned i = 0, e = Aliases.size(); i != e; ++i) {
Record *R = Aliases[i];
Cases.push_back(std::make_pair(R->getValueAsString("FromMnemonic"),
"Mnemonic = \"" +
R->getValueAsString("ToMnemonic") +
"\"; return;"));
AliasesFromMnemonic[R->getValueAsString("FromMnemonic")].push_back(R);
}
// Process each alias a "from" mnemonic at a time, building the code executed
// by the string remapper.
std::vector<StringMatcher::StringPair> Cases;
for (std::map<std::string, std::vector<Record*> >::iterator
I = AliasesFromMnemonic.begin(), E = AliasesFromMnemonic.end();
I != E; ++I) {
const std::string &From = I->first;
const std::vector<Record*> &ToVec = I->second;
// If there is only one destination mnemonic, generate simple code.
if (ToVec.size() == 1) {
Cases.push_back(std::make_pair(From, "Mnemonic = \"" +
ToVec[0]->getValueAsString("ToMnemonic") +
"\"; return;"));
continue;
}
// Otherwise, diagnose an error, can't have two aliases from the same
// mnemonic.
PrintError(ToVec[0]->getLoc(), "two MnemonicAliases with the same 'from' mnemonic!");
PrintError(ToVec[1]->getLoc(), "this is the other MnemonicAliases.");
throw std::string("ERROR: Invalid MnemonicAliases definitions!");
}
StringMatcher("Mnemonic", Cases, OS).Emit();
OS << "}\n";