[PCH] When pre-validating the headers from the PCH, only validate non-system headers.
Stat'ing all the headers from the PCH to make sure they are up-to-date takes significant time.
In a particular source file (whose PCH file included Cocoa.h) from total -fsyntax-only time
12% was just stat calls. Change pre-validation to only check non-system headers.
There are some notable disadvantages:
-If a system header, that is not include-guarded, changes after the PCH was created, we will not
find it in the header info table and we will #import it, effectively #importing it twice, thus
we will emit some error due to a multiple definition and after that the "header was modified" error will likely
be emitted, for example something like:
NSDictionary.h:12:1: error: duplicate interface definition for class 'NSDictionary'
@interface NSDictionary : NSObject <NSCopying, NSMutableCopying, NSSecureCoding, NSFastEnumeration>
^
NSDictionary.h:12:12: note: previous definition is here
@interface NSDictionary : NSObject <NSCopying, NSMutableCopying, NSSecureCoding, NSFastEnumeration>
^
fatal error: file 'NSDictionary.h' has been modified since the precompiled header was built
Though we get the "header was modified" error, this is a bit confusing.
-Theoretically it is possible that such a system header will cause no errors but it will just cause an
unfortunate semantic change, though I find this rather unlikely.
The advantages:
-Reduces compilation time when using a huge PCH like the Cocoa ones
-System headers change very infrequent and when they do, users/build systems should be able to know that
re-building from scratch is needed.
Addresses rdar://13056262
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176567 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index d62c42b..0389722 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -1680,10 +1680,12 @@
Error("malformed block record in AST file");
return Failure;
case llvm::BitstreamEntry::EndBlock:
- // Validate all of the input files.
+ // Validate all of the non-system input files.
if (!DisableValidation) {
bool Complain = (ClientLoadCapabilities & ARR_OutOfDate) == 0;
- for (unsigned I = 0, N = Record[0]; I < N; ++I) {
+ // All user input files reside at the index range [0, Record[1]).
+ // Record is the one from INPUT_FILE_OFFSETS.
+ for (unsigned I = 0, N = Record[1]; I < N; ++I) {
InputFile IF = getInputFile(F, I+1, Complain);
if (!IF.getFile() || IF.isOutOfDate())
return OutOfDate;