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c509534d2e
Add support for continuously syncing profile counter updates to a file. The motivation for this is that programs do not always exit cleanly. On iOS, for example, programs are usually killed via a signal from the OS. Running atexit() handlers after catching a signal is unreliable, so some method for progressively writing out profile data is necessary. The approach taken here is to mmap() the `__llvm_prf_cnts` section onto a raw profile. To do this, the linker must page-align the counter and data sections, and the runtime must ensure that counters are mapped to a page-aligned offset within a raw profile. Continuous mode is (for the moment) incompatible with the online merging mode. This limitation is lifted in https://reviews.llvm.org/D69586. Continuous mode is also (for the moment) incompatible with value profiling, as I'm not sure whether there is interest in this and the implementation may be tricky. As I have not been able to test extensively on non-Darwin platforms, only Darwin support is included for the moment. However, continuous mode may "just work" without modification on Linux and some UNIX-likes. AIUI the default value for the GNU linker's `--section-alignment` flag is set to the page size on many systems. This appears to be true for LLD as well, as its `no_nmagic` option is on by default. Continuous mode will not "just work" on Fuchsia or Windows, as it's not possible to mmap() a section on these platforms. There is a proposal to add a layer of indirection to the profile instrumentation to support these platforms. rdar://54210980 Differential Revision: https://reviews.llvm.org/D68351
55 lines
1.9 KiB
Plaintext
55 lines
1.9 KiB
Plaintext
// Header
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//
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// INSTR_PROF_RAW_HEADER(uint64_t, Magic, __llvm_profile_get_magic())
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// INSTR_PROF_RAW_HEADER(uint64_t, Version, __llvm_profile_get_version())
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// INSTR_PROF_RAW_HEADER(uint64_t, DataSize, DataSize)
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// INSTR_PROF_RAW_HEADER(uint64_t, CountersSize, CountersSize)
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// INSTR_PROF_RAW_HEADER(uint64_t, NamesSize, NamesSize)
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// INSTR_PROF_RAW_HEADER(uint64_t, CountersDelta, (uintptr_t)CountersBegin)
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// INSTR_PROF_RAW_HEADER(uint64_t, NamesDelta, (uintptr_t)NamesBegin)
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// INSTR_PROF_RAW_HEADER(uint64_t, ValueKindLast, IPVK_Last)
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RUN: printf '\201rforpl\377' > %t.profraw
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RUN: printf '\5\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\1\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\0\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\2\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\0\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\10\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\0\0\6\0\1\0\0\0' >> %t.profraw
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RUN: printf '\0\0\6\0\2\0\0\0' >> %t.profraw
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RUN: printf '\0\0\0\0\0\0\0\0' >> %t.profraw
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// Data Section
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//
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// struct ProfData {
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// #define INSTR_PROF_DATA(Type, LLVMType, Name, Initializer) \
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// Type Name;
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// #include "llvm/ProfileData/InstrProfData.inc"
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// };
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RUN: printf '\067\265\035\031\112\165\023\344' >> %t.profraw
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RUN: printf '\02\0\0\0\0\0\0\0' >> %t.profraw
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// Note: The CounterPtr here is off-by-one.
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//
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// Octal '\11' is 9 in decimal: this should push CounterOffset to 1. As there are two counters,
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// the profile reader should error out.
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RUN: printf '\11\0\6\0\1\0\0\0' >> %t.profraw
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RUN: printf '\0\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\0\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\02\0\0\0\0\0\0\0' >> %t.profraw
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// Counter Section
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RUN: printf '\067\0\0\0\0\0\0\0' >> %t.profraw
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RUN: printf '\101\0\0\0\0\0\0\0' >> %t.profraw
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// Name Section
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RUN: printf '\3\0bar\0\0\0' >> %t.profraw
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RUN: not llvm-profdata merge -o /dev/null %t.profraw 2>&1 | FileCheck %s
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CHECK: Malformed instrumentation profile data
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