bjoernager/rust
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Explicitly assign constructed C++ classes

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C++ style guides I am aware of recommend specifically preferring = syntax
for any classes with fairly obvious constructors[^0] that do not perform
any complicated logic in their constructor. I contend that all constructors
that the `rustc_llvm` code uses qualify. This has only become more common
since C++ 17 guaranteed many cases of copy initialization elision.

The other detail is that I tried to ask another contributor with
infinitely more C++ experience than me (i.e. any) what this constructor
syntax was, and they thought it was a macro. I know of no other language
that has adopted this same syntax. As the rustc codebase features many
contributors experienced in many other languages, using a less...
unique... style has many other benefits in making this code more
lucid and maintainable, which is something it direly needs.

[^0]: e.g. https://abseil.io/tips/88
This commit is contained in:
Jubilee Young 2024-03-05 20:04:24 -08:00
parent 3c029725f5
commit 23623a08d6
4 changed files with 53 additions and 52 deletions
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9
compiler/rustc_llvm/llvm-wrapper/SymbolWrapper.cpp
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@ -11,6 +11,7 @@
#include "llvm/ADT/SmallString.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Object/ObjectFile.h"
#include <llvm/Support/raw_ostream.h>
using namespace llvm;
using namespace llvm::sys;
@ -42,7 +43,7 @@ extern "C" void *LLVMRustGetSymbols(
MemoryBuffer::getMemBuffer(StringRef(BufPtr, BufLen), StringRef("LLVMRustGetSymbolsObject"),
false);
SmallString<0> SymNameBuf;
raw_svector_ostream SymName(SymNameBuf);
auto SymName = raw_svector_ostream(SymNameBuf);
// In the scenario when LLVMContext is populated SymbolicFile will contain a
// reference to it, thus SymbolicFile should be destroyed first.
@ -60,7 +61,7 @@ extern "C" void *LLVMRustGetSymbols(
if (!ObjOrErr) {
Error E = ObjOrErr.takeError();
SmallString<0> ErrorBuf;
raw_svector_ostream Error(ErrorBuf);
auto Error = raw_svector_ostream(ErrorBuf);
Error << E << '\0';
return ErrorCallback(Error.str().data());
}
@ -70,7 +71,7 @@ extern "C" void *LLVMRustGetSymbols(
if (!ObjOrErr) {
Error E = ObjOrErr.takeError();
SmallString<0> ErrorBuf;
raw_svector_ostream Error(ErrorBuf);
auto Error = raw_svector_ostream(ErrorBuf);
Error << E << '\0';
return ErrorCallback(Error.str().data());
}
@ -83,7 +84,7 @@ extern "C" void *LLVMRustGetSymbols(
continue;
if (Error E = S.printName(SymName)) {
SmallString<0> ErrorBuf;
raw_svector_ostream Error(ErrorBuf);
auto Error = raw_svector_ostream(ErrorBuf);
Error << E << '\0';
return ErrorCallback(Error.str().data());
}