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[llvm-objdump] Print ... even if a data mapping symbol is active
Swap `!DisassembleZeroes` and `if (DumpARMELFData)` conditions so that in the false DisassembleZeroes case (default), `...` will be printed for long consecutive zeroes, even when a data mapping symbol is active. This is especially useful for certain lld tests that insert a huge padding within a code section. Without `...` the output will be huge. Pull Request: #109553
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‎lld/test/ELF/aarch64-undefined-weak.s‎

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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
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// REQUIRES: aarch64
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// RUN: llvm-mc -filetype=obj -triple=aarch64-none-linux %s -o %t.o
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// RUN: ld.lld --image-base=0x10000000 %t.o -o %t
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// RUN: llvm-objdump -d --no-show-raw-insn %t | FileCheck %s
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// RUN: llvm-objdump -d -z --no-show-raw-insn %t | FileCheck %s
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// Check that the ARM 64-bit ABI rules for undefined weak symbols are applied.
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// Branch instructions are resolved to the next instruction. Undefined

‎llvm/test/MC/ARM/ltorg-range.s‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
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@ RUN: llvm-mc -triple armv7-unknown-linux-gnueabi -filetype obj -o - %s \
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@ RUN: | llvm-objdump -d - | FileCheck %s
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@ RUN: | llvm-objdump -d -z - | FileCheck %s
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ldr r0, =0x01020304
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@ CHECK: ldr

‎llvm/test/tools/llvm-objdump/ELF/AArch64/zeroes.test‎

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@@ -0,0 +1,66 @@
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## Test zero dumping when a data mapping symbol is active.
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# RUN: llvm-mc -filetype=obj -triple=aarch64 %s -o %t
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# RUN: llvm-objdump -t -d %t | FileCheck %s
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# CHECK: SYMBOL TABLE:
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# CHECK-NEXT: 0000000000000000 l .text 0000000000000000 $d
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# CHECK-NEXT: 000000000000000c l .text 0000000000000000 $x
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# CHECK-NEXT: 0000000000000010 l .text 0000000000000000 $d
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# CHECK: 0000000000000000 <_start>:
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# CHECK-NEXT: ...
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# CHECK-NEXT: 8: 01 00 00 00 .word 0x00000001
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# CHECK-NEXT: c: d503201f nop
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# CHECK-NEXT: ...
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# CHECK-NEXT: 18: d503201f nop
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# CHECK-NEXT: ...
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# CHECK-NEXT: 2c: d503201f nop
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# CHECK-NEXT: ...
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# CHECK-NEXT: 48: d503201f nop
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# RUN: llvm-objdump -d -z %t | FileCheck %s --check-prefix=ZERO
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# ZERO: 0000000000000000 <_start>:
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# ZERO-NEXT: 0: 00 00 00 00 .word 0x00000000
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# ZERO-NEXT: 4: 00 00 00 00 .word 0x00000000
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# ZERO-NEXT: 8: 01 00 00 00 .word 0x00000001
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# ZERO-NEXT: c: d503201f nop
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# ZERO-NEXT: 10: 00 00 00 00 .word 0x00000000
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# ZERO-NEXT: 14: 00 00 00 00 .word 0x00000000
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# ZERO-NEXT: 18: d503201f nop
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## Check we do not skip zeroes blocks if have relocations pointed to these places.
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# RUN: llvm-objdump -d -r %t | FileCheck %s --check-prefix=RELOC
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# RELOC: 0000000000000000 <_start>:
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# RELOC-NEXT: ...
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# RELOC-NEXT: 8: 01 00 00 00 .word 0x00000001
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# RELOC-NEXT: c: d503201f nop
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# RELOC-NEXT: ...
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# RELOC-NEXT: 18: d503201f nop
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# RELOC-NEXT: 1c: 00 00 00 00 .word 0x00000000
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# RELOC-NEXT: 000000000000001c: R_AARCH64_ABS64 x1
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# RELOC-NEXT: ...
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# RELOC-NEXT: 2c: d503201f nop
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# RELOC-NEXT: ...
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# RELOC-NEXT: 38: 00 00 00 00 .word 0x00000000
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# RELOC-NEXT: 0000000000000038: R_AARCH64_ABS64 x2
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# RELOC-NEXT: ...
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# RELOC-NEXT: 48: d503201f nop
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.globl _start
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_start:
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.space 8
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.long 1
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nop
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.space 8
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nop
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.quad x1
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.space 8
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nop
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.space 8
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.quad x2
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.space 8
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nop

‎llvm/test/tools/llvm-objdump/ELF/ARM/zeroes.test‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,47 @@
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## Test zero dumping when a data mapping symbol is active.
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# RUN: llvm-mc -filetype=obj -triple=armv7 %s -o %t
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# RUN: llvm-objdump -t -d %t | FileCheck %s
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# CHECK: SYMBOL TABLE:
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# CHECK-NEXT: 00000000 l .text 00000000 $d
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# CHECK-NEXT: 0000000c l .text 00000000 $a
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# CHECK-NEXT: 00000010 l .text 00000000 $d
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# CHECK: 00000000 <_start>:
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# CHECK-NEXT: ...
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# CHECK-NEXT: 8: 01 00 00 00 .word 0x00000001
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# CHECK-NEXT: c: e320f000 <unknown>
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# CHECK-NEXT: ...
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# CHECK-NEXT: 18: e320f000 <unknown>
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# CHECK-NEXT: ...
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# CHECK-NEXT: 28: e320f000 <unknown>
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# CHECK-NEXT: ...
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# CHECK-NEXT: 40: e320f000 <unknown>
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# RUN: llvm-objdump -d -z --triple=armv7 %t | FileCheck %s --check-prefix=ZERO
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# ZERO: 00000000 <_start>:
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# ZERO-NEXT: 0: 00 00 00 00 .word 0x00000000
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# ZERO-NEXT: 4: 00 00 00 00 .word 0x00000000
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# ZERO-NEXT: 8: 01 00 00 00 .word 0x00000001
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# ZERO-NEXT: c: e320f000 nop
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# ZERO-NEXT: 10: 00 00 00 00 .word 0x00000000
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# ZERO-NEXT: 14: 00 00 00 00 .word 0x00000000
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# ZERO-NEXT: 18: e320f000 nop
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.globl _start
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_start:
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.space 8
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.long 1
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nop
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.space 8
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nop
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.long x1
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.space 8
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nop
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.space 8
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.long x2
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.space 8
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nop

‎llvm/tools/llvm-objdump/llvm-objdump.cpp‎

Lines changed: 18 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -2244,27 +2244,28 @@ disassembleObject(ObjectFile &Obj, const ObjectFile &DbgObj,
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return false;
22452245
};
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2247+
// When -z or --disassemble-zeroes are given we always dissasemble
2248+
// them. Otherwise we might want to skip zero bytes we see.
2249+
if (!DisassembleZeroes) {
2250+
uint64_t MaxOffset = End - Index;
2251+
// For --reloc: print zero blocks patched by relocations, so that
2252+
// relocations can be shown in the dump.
2253+
if (InlineRelocs && RelCur != RelEnd)
2254+
MaxOffset = std::min(RelCur->getOffset() - RelAdjustment - Index,
2255+
MaxOffset);
2256+
2257+
if (size_t N =
2258+
countSkippableZeroBytes(Bytes.slice(Index, MaxOffset))) {
2259+
FOS << "\t\t..." << '\n';
2260+
Index += N;
2261+
continue;
2262+
}
2263+
}
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if (DumpARMELFData) {
22482266
Size = dumpARMELFData(SectionAddr, Index, End, Obj, Bytes,
22492267
MappingSymbols, *DT->SubtargetInfo, FOS);
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} else {
2251-
// When -z or --disassemble-zeroes are given we always dissasemble
2252-
// them. Otherwise we might want to skip zero bytes we see.
2253-
if (!DisassembleZeroes) {
2254-
uint64_t MaxOffset = End - Index;
2255-
// For --reloc: print zero blocks patched by relocations, so that
2256-
// relocations can be shown in the dump.
2257-
if (InlineRelocs && RelCur != RelEnd)
2258-
MaxOffset = std::min(RelCur->getOffset() - RelAdjustment - Index,
2259-
MaxOffset);
2260-
2261-
if (size_t N =
2262-
countSkippableZeroBytes(Bytes.slice(Index, MaxOffset))) {
2263-
FOS << "\t\t..." << '\n';
2264-
Index += N;
2265-
continue;
2266-
}
2267-
}
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22692270
if (DumpTracebackTableForXCOFFFunction &&
22702271
doesXCOFFTracebackTableBegin(Bytes.slice(Index, 4))) {

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