## Test that yaml2obj handles load commands with cmdsize smaller than the
## actual structure size without crashing (due to integer underflow).

## Test with a known load command (LC_SEGMENT_64).
# RUN: yaml2obj %s --docnum=1 -o %t1 2>&1 | FileCheck %s --check-prefix=WARNING-KNOWN
# RUN: not llvm-readobj --file-headers %t1 2>&1 | FileCheck %s --check-prefix=MALFORMED

# WARNING-KNOWN: warning: load command 0 LC_SEGMENT_64 cmdsize too small (56 bytes) for actual size (72 bytes)

# MALFORMED: error: {{.*}}: truncated or malformed object (load command 0 LC_SEGMENT_64 cmdsize too small)

--- !mach-o
FileHeader:
  magic:           0xFEEDFACF
  cputype:         0x01000007
  cpusubtype:      0x00000003
  filetype:        0x00000001
  ncmds:           1
  sizeofcmds:      56
  flags:           0x00002000
  reserved:        0x00000000
LoadCommands:
  - cmd:             LC_SEGMENT_64
    cmdsize:         56          ## Should be 72 for LC_SEGMENT_64
    segname:         '__TEXT'
    vmaddr:          0x1000
    vmsize:          0x10
    fileoff:         0
    filesize:        0
    maxprot:         7
    initprot:        5
    nsects:          0
    flags:           0
...

## Test with an unknown load command value.
# RUN: yaml2obj %s --docnum=2 -o %t2 2>&1 | FileCheck %s --check-prefix=WARNING-UNKNOWN

# WARNING-UNKNOWN: warning: load command 0 (0xdeadbeef) cmdsize too small (8 bytes) for actual size (20 bytes)

--- !mach-o
FileHeader:
  magic:           0xFEEDFACF
  cputype:         0x01000007
  cpusubtype:      0x00000003
  filetype:        0x00000001
  ncmds:           1
  sizeofcmds:      20
  flags:           0x00002000
  reserved:        0x00000000
LoadCommands:
  - cmd:             0xDEADBEEF
    cmdsize:         8
    PayloadBytes:    [0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C]
...