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Represent runtime preemption in the IR.

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Currently we do not represent runtime preemption in the IR, which has several
drawbacks:

  1) The semantics of GlobalValues differ depending on the object file format
     you are targeting (as well as the relocation-model and -fPIE value).
  2) We have no way of disabling inlining of run time interposable functions,
     since in the IR we only know if a function is link-time interposable.
     Because of this llvm cannot support elf-interposition semantics.
  3) In LTO builds of executables we will have extra knowledge that a symbol
     resolved to a local definition and can't be preemptable, but have no way to
     propagate that knowledge through the compiler.

This patch adds preemptability specifiers to the IR with the following meaning:

dso_local --> means the compiler may assume the symbol will resolve to a
 definition within the current linkage unit and the symbol may be accessed
 directly even if the definition is not within this compilation unit.

dso_preemptable --> means that the compiler must assume the GlobalValue may be
replaced with a definition from outside the current linkage unit at runtime.

To ease transitioning dso_preemptable is treated as a 'default' in that
low-level codegen will still do the same checks it did previously to see if a
symbol should be accessed indirectly. Eventually when IR producers emit the
specifiers on all Globalvalues we can change dso_preemptable to mean 'always
access indirectly', and remove the current logic.

Differential Revision: https://reviews.llvm.org/D20217

llvm-svn: 316668
This commit is contained in:
Sean Fertile
2017-10-26 15:00:26 +00:00
parent 2232243863
commit c70d28bff5
20 changed files with 1262 additions and 49 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@@ -1197,7 +1197,7 @@ void ModuleBitcodeWriter::writeModuleInfo() {
// GLOBALVAR: [strtab offset, strtab size, type, isconst, initid,
// linkage, alignment, section, visibility, threadlocal,
// unnamed_addr, externally_initialized, dllstorageclass,
// comdat, attributes]
// comdat, attributes, DSO_Local]
Vals.push_back(addToStrtab(GV.getName()));
Vals.push_back(GV.getName().size());
Vals.push_back(VE.getTypeID(GV.getValueType()));
@@ -1213,7 +1213,8 @@ void ModuleBitcodeWriter::writeModuleInfo() {
GV.isExternallyInitialized() ||
GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass ||
GV.hasComdat() ||
GV.hasAttributes()) {
GV.hasAttributes() ||
GV.isDSOLocal()) {
Vals.push_back(getEncodedVisibility(GV));
Vals.push_back(getEncodedThreadLocalMode(GV));
Vals.push_back(getEncodedUnnamedAddr(GV));
@@ -1223,6 +1224,8 @@ void ModuleBitcodeWriter::writeModuleInfo() {
auto AL = GV.getAttributesAsList(AttributeList::FunctionIndex);
Vals.push_back(VE.getAttributeListID(AL));
Vals.push_back(GV.isDSOLocal());
} else {
AbbrevToUse = SimpleGVarAbbrev;
}
@@ -1236,7 +1239,7 @@ void ModuleBitcodeWriter::writeModuleInfo() {
// FUNCTION: [strtab offset, strtab size, type, callingconv, isproto,
// linkage, paramattrs, alignment, section, visibility, gc,
// unnamed_addr, prologuedata, dllstorageclass, comdat,
// prefixdata, personalityfn]
// prefixdata, personalityfn, DSO_Local]
Vals.push_back(addToStrtab(F.getName()));
Vals.push_back(F.getName().size());
Vals.push_back(VE.getTypeID(F.getFunctionType()));
@@ -1258,6 +1261,7 @@ void ModuleBitcodeWriter::writeModuleInfo() {
Vals.push_back(
F.hasPersonalityFn() ? (VE.getValueID(F.getPersonalityFn()) + 1) : 0);
Vals.push_back(F.isDSOLocal());
unsigned AbbrevToUse = 0;
Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
Vals.clear();
@@ -1266,7 +1270,8 @@ void ModuleBitcodeWriter::writeModuleInfo() {
// Emit the alias information.
for (const GlobalAlias &A : M.aliases()) {
// ALIAS: [strtab offset, strtab size, alias type, aliasee val#, linkage,
// visibility, dllstorageclass, threadlocal, unnamed_addr]
// visibility, dllstorageclass, threadlocal, unnamed_addr,
// DSO_Local]
Vals.push_back(addToStrtab(A.getName()));
Vals.push_back(A.getName().size());
Vals.push_back(VE.getTypeID(A.getValueType()));
@@ -1277,6 +1282,8 @@ void ModuleBitcodeWriter::writeModuleInfo() {
Vals.push_back(getEncodedDLLStorageClass(A));
Vals.push_back(getEncodedThreadLocalMode(A));
Vals.push_back(getEncodedUnnamedAddr(A));
Vals.push_back(A.isDSOLocal());
unsigned AbbrevToUse = 0;
Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
Vals.clear();