perf/Documentation/jitdump-specification.txt

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17 …ile is generated by Just-In-time compiler runtimes to save meta-data information about the generat…
21 The format of the file is binary. It is self-describing in terms of endianness and is portable acro…
27 …ly sequential accesses, i.e., append only mode. The file starts with a fixed size file header desc…
29 …a fixed size header describing the type of record and its size. It is, itself, followed by the pay…
36 Each jitdump file starts with a fixed size header containing the following fields in order:
39 * uint32_t magic     : a magic number tagging the file type. The value is 4-byte long and represent…
40 * uint32_t version   : a 4-byte value representing the format version. It is currently set to 1
41 * uint32_t total_size: size in bytes of file header
49 …* bit 0: JITDUMP_FLAGS_ARCH_TIMESTAMP : set if the jitdump file is using an architecture-specific …
53 The file header is immediately followed by records. Each record starts with a fixed size header des…
57 * uint32_t total_size: the size in bytes of the record including the header.
72   The record has the following fields following the fixed-size record header in order:
77   * uint64_t code_size: size in bytes of the generated jitted code
84   * fixed-sized fields
89 …dentify each jitted function. The index can be a monotonically increasing 64-bit value. Each time …
98   The record has the following fields following the fixed-size record header in order:
104   * uint64_t code_size    : size in bytes of the jitted code
112 The code size of the function cannot change.
121 The record has the following fields following the fixed-size record header in order:
156 The record has the following fields following the fixed-size record header in order:
158 uint64_t unwind_data_size   : the size in bytes of the unwinding data table at the end of the record
159 uint64_t eh_frame_hdr_size  : the size in bytes of the DWARF EH Frame Header at the start of the un…
160 uint64_t mapped_size        : the size of the unwinding data mapped in memory
167 …escribed in the document at https://refspecs.linuxbase.org/LSB_3.0.0/LSB-PDA/LSB-PDA/ehframechpt.h…