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Bitcode: Do not create FNENTRYs for aliases of functions.

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There doesn't seem to be any point in doing this.

Differential Revision: https://reviews.llvm.org/D31691

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299694 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne 2017-04-06 19:39:24 +00:00
parent 93e3e80c72
commit 593fb7ed17
3 changed files with 6 additions and 19 deletions
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16
lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -1796,22 +1796,16 @@ Error BitcodeReader::parseValueSymbolTable(uint64_t Offset) {
return Err;
Value *V = ValOrErr.get();
auto *GO = dyn_cast<GlobalObject>(V);
if (!GO) {
// If this is an alias, need to get the actual Function object
// it aliases, in order to set up the DeferredFunctionInfo entry below.
auto *GA = dyn_cast<GlobalAlias>(V);
if (GA)
GO = GA->getBaseObject();
assert(GO);
}
auto *F = dyn_cast<Function>(V);
// Ignore function offsets emitted for aliases of functions in older
// versions of LLVM.
if (!F)
break;
// Note that we subtract 1 here because the offset is relative to one word
// before the start of the identification or module block, which was
// historically always the start of the regular bitcode header.
uint64_t FuncWordOffset = Record[1] - 1;
Function *F = dyn_cast<Function>(GO);
assert(F);
uint64_t FuncBitOffset = FuncWordOffset * 32;
DeferredFunctionInfo[F] = FuncBitOffset + FuncBitcodeOffsetDelta;
// Set the LastFunctionBlockBit to point to the last function block.

7
lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -2924,13 +2924,6 @@ void ModuleBitcodeWriter::writeValueSymbolTable(
NameVals.push_back(VE.getValueID(Name.getValue()));
Function *F = dyn_cast<Function>(Name.getValue());
if (!F) {
// If value is an alias, need to get the aliased base object to
// see if it is a function.
auto *GA = dyn_cast<GlobalAlias>(Name.getValue());
if (GA && GA->getBaseObject())
F = dyn_cast<Function>(GA->getBaseObject());
}
// VST_CODE_ENTRY: [valueid, namechar x N]
// VST_CODE_FNENTRY: [valueid, funcoffset, namechar x N]

2
test/Bitcode/thinlto-function-summary.ll
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@ -17,7 +17,7 @@
; BC-NEXT: <FNENTRY {{.*}} op0=4 {{.*}}> record string = 'variadic'
; BC-NEXT: <FNENTRY {{.*}} op0=1 {{.*}}> record string = 'foo'
; BC-NEXT: <FNENTRY {{.*}} op0=2 {{.*}}> record string = 'bar'
; BC-NEXT: <FNENTRY {{.*}} op0=5 {{.*}}> record string = 'f'
; BC-NEXT: <ENTRY {{.*}} op0=5 {{.*}}> record string = 'f'
; BC-NEXT: <ENTRY {{.*}} record string = 'h'
; BC-NEXT: <FNENTRY {{.*}} op0=3 {{.*}}> record string = 'anon.