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Add IR support, ELF section and user documentation for partitioning feature.

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The partitioning feature was proposed here:
http://lists.llvm.org/pipermail/llvm-dev/2019-February/130583.html

This is mostly just documentation. The feature itself will be contributed
in subsequent patches.

Differential Revision: https://reviews.llvm.org/D60242

llvm-svn: 361923
This commit is contained in:
Peter Collingbourne
2019-05-29 03:29:01 +00:00
parent 10c548cdfa
commit 31fda09b2d
23 changed files with 470 additions and 8 deletions
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20
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -2892,7 +2892,8 @@ static void inferDSOLocal(GlobalValue *GV) {
Error BitcodeReader::parseGlobalVarRecord(ArrayRef<uint64_t> Record) {
// v1: [pointer type, isconst, initid, linkage, alignment, section,
// visibility, threadlocal, unnamed_addr, externally_initialized,
// dllstorageclass, comdat, attributes, preemption specifier] (name in VST)
// dllstorageclass, comdat, attributes, preemption specifier,
// partition strtab offset, partition strtab size] (name in VST)
// v2: [strtab_offset, strtab_size, v1]
StringRef Name;
std::tie(Name, Record) = readNameFromStrtab(Record);
@@ -2983,6 +2984,10 @@ Error BitcodeReader::parseGlobalVarRecord(ArrayRef<uint64_t> Record) {
}
inferDSOLocal(NewGV);
// Check whether we have enough values to read a partition name.
if (Record.size() > 15)
NewGV->setPartition(StringRef(Strtab.data() + Record[14], Record[15]));
return Error::success();
}
@@ -3072,6 +3077,12 @@ Error BitcodeReader::parseFunctionRecord(ArrayRef<uint64_t> Record) {
}
inferDSOLocal(Func);
// Record[16] is the address space number.
// Check whether we have enough values to read a partition name.
if (Record.size() > 18)
Func->setPartition(StringRef(Strtab.data() + Record[17], Record[18]));
ValueList.push_back(Func);
// If this is a function with a body, remember the prototype we are
@@ -3149,6 +3160,13 @@ Error BitcodeReader::parseGlobalIndirectSymbolRecord(
NewGA->setDSOLocal(getDecodedDSOLocal(Record[OpNum++]));
inferDSOLocal(NewGA);
// Check whether we have enough values to read a partition name.
if (OpNum + 1 < Record.size()) {
NewGA->setPartition(
StringRef(Strtab.data() + Record[OpNum], Record[OpNum + 1]));
OpNum += 2;
}
ValueList.push_back(NewGA);
IndirectSymbolInits.push_back(std::make_pair(NewGA, Val));
return Error::success();