derek.holloway
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47 lines
2.2 KiB
Plaintext
47 lines
2.2 KiB
Plaintext
## A malformed ISA mapping symbol ("$x<garbage>") must not crash llvm-objdump
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## and must not silently produce a wrong decode. The cache should remember
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## the parse failure so repeated accesses do not keep consuming the error,
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## and decoding must fall back to the base target (which here includes V via
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## Tag_RISCV_arch), so the V instruction still decodes correctly. A warning
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## should be emitted exactly once per bad string so the user understands why
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## the fallback kicked in.
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##
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## This needs yaml2obj because llvm-mc only ever emits well-formed
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## normalized arch strings.
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# RUN: yaml2obj %s -o %t.o
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# RUN: llvm-objdump -d -M no-aliases --no-show-raw-insn %t.o 2>%t.err \
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# RUN: | FileCheck %s
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# RUN: FileCheck --check-prefix=WARN --implicit-check-not=warning: %s < %t.err
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# WARN: warning: {{.*}}: could not parse ISA mapping symbol '$xbogus_not_a_real_arch_string':{{.*}}; falling back to default disassembler
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# CHECK-LABEL: <.text>:
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## 0x003676d7 = vsetvli a3, a2, e8, m8, tu, mu — requires V. The mapping
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## symbol at offset 0 is "$xbogus_not_a_real_arch_string", which fails to
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## parse; llvm-objdump must silently fall back to the base features (V from
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## Tag_RISCV_arch) and decode the instruction.
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# CHECK-NEXT: 0: vsetvli a3, a2, e8, m8, tu, mu
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## A second instruction exercises the cached-failure path (same bad symbol
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## is consulted repeatedly without re-parsing or spurious diagnostics).
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# CHECK-NEXT: 4: vsetvli a3, a2, e8, m8, tu, mu
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_RISCV
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Content: D7763600D7763600
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- Name: .riscv.attributes
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Type: SHT_RISCV_ATTRIBUTES
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Content: 41bb00000072697363760001b10000000572763634693270315f6d3270305f613270315f663270325f643270325f633270305f763170305f7a696373723270305f7a6d6d756c3170305f7a61616d6f3170305f7a616c7273633170305f7a63613170305f7a63643170305f7a76653332663170305f7a76653332783170305f7a76653634643170305f7a76653634663170305f7a76653634783170305f7a766c313238623170305f7a766c3332623170305f7a766c36346231703000
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Symbols:
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- Name: $xbogus_not_a_real_arch_string
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Section: .text
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Value: 0x0
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