60fa28882e
Change ASTFileSignature from a random 32-bit number to the hash of the
PCM content.
- Move definition ASTFileSignature to Basic/Module.h so Module and
ASTSourceDescriptor can use it.
- Change the signature from uint64_t to std::array<uint32_t,5>.
- Stop using (saving/reading) the size and modification time of PCM
files when there is a valid SIGNATURE.
- Add UNHASHED_CONTROL_BLOCK, and use it to store the SIGNATURE record
and other records that shouldn't affect the hash. Because implicit
modules reuses the same file for multiple levels of -Werror, this
includes DIAGNOSTIC_OPTIONS and DIAG_PRAGMA_MAPPINGS.
This helps to solve a PCH + implicit Modules dependency issue: PCH files
are handled by the external build system, whereas implicit modules are
handled by internal compiler build system. This prevents invalidating a
PCH when the compiler overwrites a PCM file with the same content
(modulo the diagnostic differences).
Design and original patch by Manman Ren!
llvm-svn: 297655
44 lines
2.2 KiB
Objective-C
44 lines
2.2 KiB
Objective-C
// RUN: rm -rf %t
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// Build Module and set its timestamp
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// RUN: echo '@import Module;' | %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs -x objective-c -
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// RUN: touch -m -a -t 201101010000 %t/Module.pcm
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// RUN: cp %t/Module.pcm %t/Module.pcm.saved
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// RUN: wc -c %t/Module.pcm > %t/Module.size.saved
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// Build DependsOnModule
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// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs %s
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// RUN: diff %t/Module.pcm %t/Module.pcm.saved
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// RUN: cp %t/DependsOnModule.pcm %t/DependsOnModule.pcm.saved
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// Rebuild Module, reset its timestamp, and verify its size hasn't changed
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// RUN: rm %t/Module.pcm
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// RUN: echo '@import Module;' | %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs -x objective-c -
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// RUN: touch -m -a -t 201101010000 %t/Module.pcm
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// RUN: wc -c %t/Module.pcm > %t/Module.size
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// RUN: diff %t/Module.size %t/Module.size.saved
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// RUN: cp %t/Module.pcm %t/Module.pcm.saved.2
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// The signature is the hash of the PCM content, we will not rebuild rebuild DependsOnModule.
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// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs %s
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// RUN: diff %t/Module.pcm %t/Module.pcm.saved.2
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// RUN: diff %t/DependsOnModule.pcm %t/DependsOnModule.pcm.saved
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// Rebuild Module, reset its timestamp, and verify its size hasn't changed
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// RUN: rm %t/Module.pcm
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// RUN: echo '@import Module;' | %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs -x objective-c -
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// RUN: touch -m -a -t 201101010000 %t/Module.pcm
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// RUN: wc -c %t/Module.pcm > %t/Module.size
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// RUN: diff %t/Module.size %t/Module.size.saved
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// RUN: cp %t/Module.pcm %t/Module.pcm.saved.2
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// Verify again with Module pre-imported.
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// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -fdisable-module-hash -fsyntax-only -F %S/Inputs %s
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// RUN: diff %t/Module.pcm %t/Module.pcm.saved.2
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// RUN: diff %t/DependsOnModule.pcm %t/DependsOnModule.pcm.saved
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#ifdef PREIMPORT
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@import Module;
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#endif
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@import DependsOnModule;
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