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[Introspection] Dont emit json if unchanged. 

Saves running the generate inc script in the, somewhat common, case where the json file doesn't need changing.

Reviewed By: steveire

Differential Revision: https://reviews.llvm.org/D100719
This commit is contained in:
Nathan James 2021-04-18 20:22:08 +01:00
parent 3d1d7156e9
commit db75db85f2
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GPG Key ID: CC007AFCDA90AA5F
1 changed files with 17 additions and 2 deletions
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19
clang/lib/Tooling/DumpTool/ASTSrcLocProcessor.cpp
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@ -10,6 +10,7 @@
#include "clang/Frontend/CompilerInstance.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace clang::tooling;
using namespace llvm;
@ -105,13 +106,27 @@ void WriteJSON(StringRef JsonPath, llvm::json::Object &&ClassInheritance,
JsonObj["classesInClade"] = std::move(ClassesInClade);
JsonObj["classEntries"] = std::move(ClassEntries);
llvm::json::Value JsonVal(std::move(JsonObj));
bool WriteChange = false;
std::string OutString;
if (auto ExistingOrErr = MemoryBuffer::getFile(JsonPath, /*IsText=*/true)) {
raw_string_ostream Out(OutString);
Out << formatv("{0:2}", JsonVal);
if (ExistingOrErr.get()->getBuffer() == Out.str())
return;
WriteChange = true;
}
std::error_code EC;
llvm::raw_fd_ostream JsonOut(JsonPath, EC, llvm::sys::fs::F_Text);
if (EC)
return;
llvm::json::Value JsonVal(std::move(JsonObj));
JsonOut << formatv("{0:2}", JsonVal);
if (WriteChange)
JsonOut << OutString;
else
JsonOut << formatv("{0:2}", JsonVal);
}
void ASTSrcLocProcessor::generate() {