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[TableGen] Remove raw_string_ostream by just emitting the header for the switch the first time we emit a case. If the header was never emitted just print the default at the end. NFC

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llvm-svn: 256627
This commit is contained in:
Craig Topper 2015-12-30 06:00:22 +00:00
parent 9fc5d25288
commit 578ed69983
1 changed files with 20 additions and 20 deletions
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40
utils/TableGen/AsmMatcherEmitter.cpp
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@ -2119,12 +2119,7 @@ static void emitIsSubclass(CodeGenTarget &Target,
OS << " if (A == B)\n";
OS << " return true;\n\n";
std::string OStr;
raw_string_ostream SS(OStr);
unsigned Count = 0;
SS << " switch (A) {\n";
SS << " default:\n";
SS << " return false;\n";
bool EmittedSwitch = false;
for (const auto &A : Infos) {
std::vector<StringRef> SuperClasses;
for (const auto &B : Infos) {
@ -2134,33 +2129,38 @@ static void emitIsSubclass(CodeGenTarget &Target,
if (SuperClasses.empty())
continue;
++Count;
SS << "\n case " << A.Name << ":\n";
// If this is the first SuperClass, emit the switch header.
if (!EmittedSwitch) {
OS << " switch (A) {\n"
OS << " default:\n";
OS << " return false;\n";
EmittedSwitch = true;
}
OS << "\n case " << A.Name << ":\n";
if (SuperClasses.size() == 1) {
SS << " return B == " << SuperClasses.back().str() << ";\n";
OS << " return B == " << SuperClasses.back().str() << ";\n";
continue;
}
if (!SuperClasses.empty()) {
SS << " switch (B) {\n";
SS << " default: return false;\n";
OS << " switch (B) {\n";
OS << " default: return false;\n";
for (StringRef SC : SuperClasses)
SS << " case " << SC << ": return true;\n";
SS << " }\n";
OS << " case " << SC << ": return true;\n";
OS << " }\n";
} else {
// No case statement to emit
SS << " return false;\n";
OS << " return false;\n";
}
}
SS << " }\n";
OS << " }\n";
// If there were case statements emitted into the string stream, write them
// to the output stream, otherwise write the default.
if (Count)
OS << SS.str();
else
// If there were case statements emitted into the string stream write the
// default.
if (!EmittedSwitch)
OS << " return false;\n";
OS << "}\n\n";