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[opaque pointer type] encode the pointee type of global variables

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Use a few extra bits in the const field (after widening it from a fixed
single bit) to stash the address space which is no longer provided by
the type (and an extra bit in there to specify that we're using that new
encoding).

llvm-svn: 235911
This commit is contained in:
David Blaikie
2015-04-27 19:58:56 +00:00
parent fe723b9a6d
commit 1a848da518
2 changed files with 20 additions and 12 deletions
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16
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -590,7 +590,7 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
unsigned MaxGlobalType = 0;
for (const GlobalValue &GV : M->globals()) {
MaxAlignment = std::max(MaxAlignment, GV.getAlignment());
MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getType()));
MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getValueType()));
if (GV.hasSection()) {
// Give section names unique ID's.
unsigned &Entry = SectionMap[GV.getSection()];
@@ -631,10 +631,12 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(MaxGlobalType+1)));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage.
if (MaxAlignment == 0) // Alignment.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // AddrSpace << 2
//| explicitType << 1
//| constant
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage.
if (MaxAlignment == 0) // Alignment.
Abbv->Add(BitCodeAbbrevOp(0));
else {
unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
@@ -659,8 +661,8 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
// linkage, alignment, section, visibility, threadlocal,
// unnamed_addr, externally_initialized, dllstorageclass,
// comdat]
Vals.push_back(VE.getTypeID(GV.getType()));
Vals.push_back(GV.isConstant());
Vals.push_back(VE.getTypeID(GV.getValueType()));
Vals.push_back(GV.getType()->getAddressSpace() << 2 | 2 | GV.isConstant());
Vals.push_back(GV.isDeclaration() ? 0 :
(VE.getValueID(GV.getInitializer()) + 1));
Vals.push_back(getEncodedLinkage(GV));