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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 98551f405e
commit 97fe3f80a5
6 changed files with 61 additions and 11 deletions
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21
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));

10
test/Bitcode/Inputs/module-hash-strtab1.ll Normal file
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@ -0,0 +1,10 @@
source_filename = "foo.c"
$com = comdat any
define void @main() comdat($com) {
call void @bar()
ret void
}
declare void @bar()

10
test/Bitcode/Inputs/module-hash-strtab2.ll Normal file
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@ -0,0 +1,10 @@
source_filename = "foo.c"
$dat = comdat any
define void @main() comdat($dat) {
call void @foo()
ret void
}
declare void @foo()

15
test/Bitcode/module-hash-strtab.ll Normal file
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@ -0,0 +1,15 @@
; RUN: opt -module-hash %s -o - | llvm-bcanalyzer -dump | grep '<HASH' > %t
; RUN: opt -module-hash %S/Inputs/module-hash-strtab1.ll -o - | llvm-bcanalyzer -dump | grep '<HASH' >> %t
; RUN: opt -module-hash %S/Inputs/module-hash-strtab2.ll -o - | llvm-bcanalyzer -dump | grep '<HASH' >> %t
; RUN: sort %t | uniq | count 3
source_filename = "foo.c"
$com = comdat any
define void @main() comdat($com) {
call void @foo()
ret void
}
declare void @foo()

8
test/Bitcode/module_hash.ll
View File

@ -1,7 +1,7 @@
; Check per module hash.
; RUN: opt -module-hash %s -o - | llvm-bcanalyzer -dump | FileCheck %s --check-prefix=MOD1
; RUN: opt -module-hash %s -o - | llvm-bcanalyzer -dump -check-hash=foo | FileCheck %s --check-prefix=MOD1
; MOD1: <HASH op0={{[0-9]*}} op1={{[0-9]*}} op2={{[0-9]*}} op3={{[0-9]*}} op4={{[0-9]*}} (match)/>
; RUN: opt -module-hash %p/Inputs/module_hash.ll -o - | llvm-bcanalyzer -dump | FileCheck %s --check-prefix=MOD2
; RUN: opt -module-hash %p/Inputs/module_hash.ll -o - | llvm-bcanalyzer -dump -check-hash=bar | FileCheck %s --check-prefix=MOD2
; MOD2: <HASH op0={{[0-9]*}} op1={{[0-9]*}} op2={{[0-9]*}} op3={{[0-9]*}} op4={{[0-9]*}} (match)/>
; Check that the hash matches in the combined index.
@ -21,8 +21,8 @@
; RUN: cat %t.hash | FileCheck %s --check-prefix=COMBINED
; First capture the value of the hash for the two modules.
; COMBINED: <HASH op0=[[HASH1_1:[0-9]*]] op1=[[HASH1_2:[0-9]*]] op2=[[HASH1_3:[0-9]*]] op3=[[HASH1_4:[0-9]*]] op4=[[HASH1_5:[0-9]*]] (match)/>
; COMBINED: <HASH op0=[[HASH2_1:[0-9]*]] op1=[[HASH2_2:[0-9]*]] op2=[[HASH2_3:[0-9]*]] op3=[[HASH2_4:[0-9]*]] op4=[[HASH2_5:[0-9]*]] (match)/>
; COMBINED: <HASH op0=[[HASH1_1:[0-9]*]] op1=[[HASH1_2:[0-9]*]] op2=[[HASH1_3:[0-9]*]] op3=[[HASH1_4:[0-9]*]] op4=[[HASH1_5:[0-9]*]]/>
; COMBINED: <HASH op0=[[HASH2_1:[0-9]*]] op1=[[HASH2_2:[0-9]*]] op2=[[HASH2_3:[0-9]*]] op3=[[HASH2_4:[0-9]*]] op4=[[HASH2_5:[0-9]*]]/>
; Validate against the value extracted from the combined index
; COMBINED-DAG: <HASH abbrevid={{[0-9]*}} op0=[[HASH1_1]] op1=[[HASH1_2]] op2=[[HASH1_3]] op3=[[HASH1_4]] op4=[[HASH1_5]]/>

8
tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
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@ -71,6 +71,10 @@ static cl::opt<bool>
ShowBinaryBlobs("show-binary-blobs",
cl::desc("Print binary blobs using hex escapes"));
static cl::opt<std::string> CheckHash(
"check-hash",
cl::desc("Check module hash using the argument as a string table"));
namespace {
/// CurStreamTypeType - A type for CurStreamType
@ -652,13 +656,15 @@ static bool ParseBlock(BitstreamCursor &Stream, BitstreamBlockInfo &BlockInfo,
}
// If we found a module hash, let's verify that it matches!
if (BlockID == bitc::MODULE_BLOCK_ID && Code == bitc::MODULE_CODE_HASH) {
if (BlockID == bitc::MODULE_BLOCK_ID && Code == bitc::MODULE_CODE_HASH &&
!CheckHash.empty()) {
if (Record.size() != 5)
outs() << " (invalid)";
else {
// Recompute the hash and compare it to the one in the bitcode
SHA1 Hasher;
StringRef Hash;
Hasher.update(CheckHash);
{
int BlockSize = (CurrentRecordPos / 8) - BlockEntryPos;
auto Ptr = Stream.getPointerToByte(BlockEntryPos, BlockSize);