bjoernager/rust
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debuginfo: add compiler option to allow compressed debuginfo sections

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LLVM already supports emitting compressed debuginfo. In debuginfo=full
builds, the debug section is often a large amount of data, and it
typically compresses very well (3x is not unreasonable.) We add a new
knob to allow debuginfo to be compressed when the matching LLVM
functionality is present. Like clang, if a known-but-disabled
compression mechanism is requested, we disable compression and emit
uncompressed debuginfo sections.

The API is different enough on older LLVMs we just pretend the support
is missing on LLVM older than 16.
This commit is contained in:
Augie Fackler 2023-07-12 17:07:34 -04:00
parent 9ad0396a34
commit af9e55068c
10 changed files with 135 additions and 7 deletions
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11
compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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@ -407,6 +407,7 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
bool RelaxELFRelocations,
bool UseInitArray,
const char *SplitDwarfFile,
const char *DebugInfoCompression,
bool ForceEmulatedTls,
const char *ArgsCstrBuff, size_t ArgsCstrBuffLen) {
@ -438,6 +439,16 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
if (SplitDwarfFile) {
Options.MCOptions.SplitDwarfFile = SplitDwarfFile;
}
#if LLVM_VERSION_GE(16, 0)
if (!strcmp("zlib", DebugInfoCompression) && llvm::compression::zlib::isAvailable()) {
Options.CompressDebugSections = DebugCompressionType::Zlib;
} else if (!strcmp("zstd", DebugInfoCompression) && llvm::compression::zstd::isAvailable()) {
Options.CompressDebugSections = DebugCompressionType::Zstd;
} else if (!strcmp("none", DebugInfoCompression)) {
Options.CompressDebugSections = DebugCompressionType::None;
}
#endif
Options.RelaxELFRelocations = RelaxELFRelocations;
Options.UseInitArray = UseInitArray;