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Emit DW_AT_main_subprogram

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This changes rustc to emit DW_AT_main_subprogram on the "main" program.
This lets gdb suitably stop at the user's main in response to
"start" (rather than the library's main, which is what happens
currently).

Fixes #32620
r? michaelwoerister
This commit is contained in:
Tom Tromey 2016-11-30 14:59:45 -07:00
parent d7777ae682
commit b037c5211b
5 changed files with 74 additions and 1 deletions
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6
src/rustllvm/RustWrapper.cpp
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@ -346,6 +346,7 @@ enum class LLVMRustDIFlags : uint32_t {
FlagStaticMember = (1 << 12),
FlagLValueReference = (1 << 13),
FlagRValueReference = (1 << 14),
FlagMainSubprogram = (1 << 21),
// Do not add values that are not supported by the minimum LLVM
// version we support!
};
@ -432,6 +433,11 @@ static unsigned fromRust(LLVMRustDIFlags Flags) {
if (isSet(Flags & LLVMRustDIFlags::FlagRValueReference)) {
Result |= DINode::DIFlags::FlagRValueReference;
}
#if LLVM_RUSTLLVM || LLVM_VERSION_GE(4, 0)
if (isSet(Flags & LLVMRustDIFlags::FlagMainSubprogram)) {
Result |= DINode::DIFlags::FlagMainSubprogram;
}
#endif
return Result;
}