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Bitcode: Include any strings added to the string table in the module hash.

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Differential Revision: https://reviews.llvm.org/D35037

llvm-svn: 307286
This commit is contained in:
Peter Collingbourne
2017-07-06 17:56:01 +00:00
parent 8d10129e59
commit c855615831
6 changed files with 61 additions and 11 deletions
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21
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -114,6 +114,8 @@ class ModuleBitcodeWriter : public BitcodeWriterBase {
/// True if a module hash record should be written.
bool GenerateHash;
SHA1 Hasher;
/// If non-null, when GenerateHash is true, the resulting hash is written
/// into ModHash. When GenerateHash is false, that specified value
/// is used as the hash instead of computing from the generated bitcode.
@@ -176,6 +178,8 @@ public:
private:
uint64_t bitcodeStartBit() { return BitcodeStartBit; }
size_t addToStrtab(StringRef Str);
void writeAttributeGroupTable();
void writeAttributeTable();
void writeTypeTable();
@@ -947,11 +951,17 @@ static unsigned getEncodedUnnamedAddr(const GlobalValue &GV) {
llvm_unreachable("Invalid unnamed_addr");
}
size_t ModuleBitcodeWriter::addToStrtab(StringRef Str) {
if (GenerateHash)
Hasher.update(Str);
return StrtabBuilder.add(Str);
}
void ModuleBitcodeWriter::writeComdats() {
SmallVector<unsigned, 64> Vals;
for (const Comdat *C : VE.getComdats()) {
// COMDAT: [strtab offset, strtab size, selection_kind]
Vals.push_back(StrtabBuilder.add(C->getName()));
Vals.push_back(addToStrtab(C->getName()));
Vals.push_back(C->getName().size());
Vals.push_back(getEncodedComdatSelectionKind(*C));
Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
@@ -1122,7 +1132,7 @@ void ModuleBitcodeWriter::writeModuleInfo() {
// linkage, alignment, section, visibility, threadlocal,
// unnamed_addr, externally_initialized, dllstorageclass,
// comdat, attributes]
Vals.push_back(StrtabBuilder.add(GV.getName()));
Vals.push_back(addToStrtab(GV.getName()));
Vals.push_back(GV.getName().size());
Vals.push_back(VE.getTypeID(GV.getValueType()));
Vals.push_back(GV.getType()->getAddressSpace() << 2 | 2 | GV.isConstant());
@@ -1161,7 +1171,7 @@ void ModuleBitcodeWriter::writeModuleInfo() {
// linkage, paramattrs, alignment, section, visibility, gc,
// unnamed_addr, prologuedata, dllstorageclass, comdat,
// prefixdata, personalityfn]
Vals.push_back(StrtabBuilder.add(F.getName()));
Vals.push_back(addToStrtab(F.getName()));
Vals.push_back(F.getName().size());
Vals.push_back(VE.getTypeID(F.getFunctionType()));
Vals.push_back(F.getCallingConv());
@@ -1191,7 +1201,7 @@ void ModuleBitcodeWriter::writeModuleInfo() {
for (const GlobalAlias &A : M.aliases()) {
// ALIAS: [strtab offset, strtab size, alias type, aliasee val#, linkage,
// visibility, dllstorageclass, threadlocal, unnamed_addr]
Vals.push_back(StrtabBuilder.add(A.getName()));
Vals.push_back(addToStrtab(A.getName()));
Vals.push_back(A.getName().size());
Vals.push_back(VE.getTypeID(A.getValueType()));
Vals.push_back(A.getType()->getAddressSpace());
@@ -1210,7 +1220,7 @@ void ModuleBitcodeWriter::writeModuleInfo() {
for (const GlobalIFunc &I : M.ifuncs()) {
// IFUNC: [strtab offset, strtab size, ifunc type, address space, resolver
// val#, linkage, visibility]
Vals.push_back(StrtabBuilder.add(I.getName()));
Vals.push_back(addToStrtab(I.getName()));
Vals.push_back(I.getName().size());
Vals.push_back(VE.getTypeID(I.getValueType()));
Vals.push_back(I.getType()->getAddressSpace());
@@ -3648,7 +3658,6 @@ void ModuleBitcodeWriter::writeModuleHash(size_t BlockStartPos) {
// Emit the module's hash.
// MODULE_CODE_HASH: [5*i32]
if (GenerateHash) {
SHA1 Hasher;
uint32_t Vals[5];
Hasher.update(ArrayRef<uint8_t>((const uint8_t *)&(Buffer)[BlockStartPos],
Buffer.size() - BlockStartPos));