[llvm] [Object] Parsing and dumping of SFrame FDEs (PR #149828)

[Fangrui Song via llvm-commits]

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+## Check parsing and dumping of SFrame Function Descriptor Entries.
+# RUN: yaml2obj --docnum=1 %s -o %t.1
+# RUN: llvm-readobj --sframe=.sframe_short --sframe=.sframe_section_relative \
+# RUN:   --sframe=.sframe_fde_relative %t.1 2>&1 | \
+# RUN:   FileCheck %s --strict-whitespace --match-full-lines \
+# RUN:   -DFILE=%t.1 --check-prefix=CASE1
+
+## Check big-endian support.
+# RUN: yaml2obj --docnum=2 %s -o %t.2
+# RUN: llvm-readobj --sframe %t.2 2>&1 | \
+# RUN:   FileCheck %s --strict-whitespace --match-full-lines \
+# RUN:   -DFILE=%t.2 --check-prefix=CASE2
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_EXEC
+Sections:
+  - Name:  .sframe_short
+    Type:  SHT_GNU_SFRAME
+    Flags: [ SHF_ALLOC ]
+    ContentArray: [
+      0xe2, 0xde, 0x02, 0x00,  # Preamble (magic, version, flags)
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MaskRay wrote:

(Aside: perhaps ContentArray should support raw hexadecimal bytes with whitespace ignored (e2de0200, or e2de 0200) https://llvm.org/docs/CommandGuide/llvm-mc.html#cmdoption-llvm-mc-hex

https://github.com/llvm/llvm-project/pull/149828