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[llvm-objdump] Prevent variable locations to overlap short comments 

For now, the source variable locations are printed at about the same
space as the comments for disassembled code, which can make some ranges
for variables disappear if a line contains comments, for example:

                                        ┠─ bar = W1
0:  add x0, x2, #2, lsl #12     // =8192┃
4:  add z31.d, z31.d, #65280    // =0xff00
8:  nop                                 ┻

The patch shifts the report a bit to allow printing comments up to
approximately 16 characters without interferences.

Differential Revision: https://reviews.llvm.org/D104700
This commit is contained in:
Igor Kudrin 2021-06-28 14:23:22 +07:00
parent abe0fa4352
commit c2e6bcb494
6 changed files with 178 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
llvm/docs/CommandGuide/llvm-objdump.rst
View File

@ -132,7 +132,7 @@ OPTIONS
.. option:: --debug-vars-indent=<width>
Distance to indent the source-level variable display, relative to the start
of the disassembly. Defaults to 40 characters.
of the disassembly. Defaults to 52 characters.
.. option:: -j, --section=<section1[,section2,...]>

56
llvm/test/tools/llvm-objdump/ELF/AArch64/disassemble-print-comments.s
View File

@ -7,7 +7,63 @@
# CHECK-NEXT: 0: add x0, x2, #2, lsl #12 // =8192
# CHECK-NEXT: 4: add z31.d, z31.d, #65280 // =0xff00
## Check that comments and locations of variables can be printed together.
# RUN: llvm-objdump -d --mattr=+sve --debug-vars --no-show-raw-insn %t | \
# RUN: FileCheck %s --check-prefix=DBGVARS
# DBGVARS: 0000000000000000 <foo>:
# DBGVARS-NEXT: ┠─ bar = W1
# DBGVARS-NEXT: 0: add x0, x2, #2, lsl #12 // =8192 ┃
# DBGVARS-NEXT: 4: add z31.d, z31.d, #65280 // =0xff00 ┻
.text
foo:
add x0, x2, 8192
add z31.d, z31.d, #65280
.LFooEnd:
.section .debug_abbrev,"",@progbits
.uleb128 1 // Abbreviation Code
.uleb128 0x11 // DW_TAG_compile_unit
.byte 1 // DW_CHILDREN_yes
.byte 0 // EOM(1)
.byte 0 // EOM(2)
.uleb128 2 // Abbreviation Code
.uleb128 0x2e // DW_TAG_subprogram
.byte 1 // DW_CHILDREN_yes
.uleb128 0x11 // DW_AT_low_pc
.uleb128 0x01 // DW_FORM_addr
.uleb128 0x12 // DW_AT_high_pc
.uleb128 0x06 // DW_FORM_data4
.byte 0 // EOM(1)
.byte 0 // EOM(2)
.uleb128 3 // Abbreviation Code
.uleb128 0x34 // DW_TAG_variable
.byte 0 // DW_CHILDREN_no
.uleb128 0x02 // DW_AT_location
.uleb128 0x18 // DW_FORM_exprloc
.uleb128 0x03 // DW_AT_name
.uleb128 0x08 // DW_FORM_string
.byte 0 // EOM(1)
.byte 0 // EOM(2)
.byte 0 // EOM(3)
.section .debug_info,"",@progbits
.long .LCuEnd-.LCuBegin // Length of Unit
.LCuBegin:
.short 4 // DWARF version number
.long .debug_abbrev // Offset Into Abbrev. Section
.byte 8 // Address Size
.uleb128 1 // Abbrev [1] DW_TAG_compile_unit
.uleb128 2 // Abbrev [2] DW_TAG_subprogram
.quad foo // DW_AT_low_pc
.long .LFooEnd-foo // DW_AT_high_pc
.uleb128 3 // Abbrev [3] DW_TAG_variable
.byte .LLocEnd-.LLocBegin // DW_AT_location
.LLocBegin:
.byte 0x51 // DW_OP_reg1
.LLocEnd:
.asciz "bar" // DW_FORM_string
.byte 0 // End Of Children Mark
.byte 0 // End Of Children Mark
.LCuEnd:

122
llvm/test/tools/llvm-objdump/ELF/ARM/debug-vars-dwarf4.s
View File

@ -12,10 +12,10 @@
# RUN: llvm-objdump - -d --debug-vars | \
# RUN: FileCheck %s --check-prefix=RAW --strict-whitespace
## Check that passing the default value for --debug-vars-indent (40) makes no
## Check that passing the default value for --debug-vars-indent (52) makes no
## change to the output.
# RUN: llvm-mc -triple armv8a--none-eabi < %s -filetype=obj | \
# RUN: llvm-objdump - -d --debug-vars --debug-vars-indent=40 | \
# RUN: llvm-objdump - -d --debug-vars --debug-vars-indent=52 | \
# RUN: FileCheck %s --check-prefix=RAW --strict-whitespace
# RUN: llvm-mc -triple armv8a--none-eabi < %s -filetype=obj | \
@ -50,19 +50,19 @@
## 8-byte tab stop, so these might not look aligned in a text editor.
# RAW: 00000000 <foo>:
# RAW-NEXT: ┠─ a = R0
# RAW-NEXT: ┃ ┠─ b = R1
# RAW-NEXT: ┃ ┃ ┠─ c = R2
# RAW-NEXT: ┃ ┃ ┃ ┌─ x = R0
# RAW-NEXT: 0: 00 00 81 e0 add r0, r1, r0 ┻ ┃ ┃ ╈
# RAW-NEXT: ┌─ y = R0
# RAW-NEXT: 4: 02 00 80 e0 add r0, r0, r2 ╈ ┃ ┃ ┻
# RAW-NEXT: 8: 1e ff 2f e1 bx lr ┻ ┻ ┻
# RAW-NEXT: ┠─ a = R0
# RAW-NEXT: ┃ ┠─ b = R1
# RAW-NEXT: ┃ ┃ ┠─ c = R2
# RAW-NEXT: ┃ ┃ ┃ ┌─ x = R0
# RAW-NEXT: 0: 00 00 81 e0 add r0, r1, r0 ┻ ┃ ┃ ╈
# RAW-NEXT: ┌─ y = R0
# RAW-NEXT: 4: 02 00 80 e0 add r0, r0, r2 ╈ ┃ ┃ ┻
# RAW-NEXT: 8: 1e ff 2f e1 bx lr ┻ ┻ ┻
# RAW-EMPTY:
# RAW-NEXT: 0000000c <bar>:
# RAW-NEXT: ┠─ a = R0
# RAW-NEXT: c: 01 00 80 e2 add r0, r0, #1 ┃
# RAW-NEXT: 10: 1e ff 2f e1 bx lr ┻
# RAW-NEXT: ┠─ a = R0
# RAW-NEXT: c: 01 00 80 e2 add r0, r0, #1 ┃
# RAW-NEXT: 10: 1e ff 2f e1 bx lr ┻
# INDENT: 00000000 <foo>:
@ -81,70 +81,70 @@
# INDENT-NEXT: 10: 1e ff 2f e1 bx lr ┻
# NO-RAW: 00000000 <foo>:
# NO-RAW-NEXT: ┠─ a = R0
# NO-RAW-NEXT: ┃ ┠─ b = R1
# NO-RAW-NEXT: ┃ ┃ ┠─ c = R2
# NO-RAW-NEXT: ┃ ┃ ┃ ┌─ x = R0
# NO-RAW-NEXT: 0: add r0, r1, r0 ┻ ┃ ┃ ╈
# NO-RAW-NEXT: ┌─ y = R0
# NO-RAW-NEXT: 4: add r0, r0, r2 ╈ ┃ ┃ ┻
# NO-RAW-NEXT: 8: bx lr ┻ ┻ ┻
# NO-RAW-NEXT: ┠─ a = R0
# NO-RAW-NEXT: ┃ ┠─ b = R1
# NO-RAW-NEXT: ┃ ┃ ┠─ c = R2
# NO-RAW-NEXT: ┃ ┃ ┃ ┌─ x = R0
# NO-RAW-NEXT: 0: add r0, r1, r0 ┻ ┃ ┃ ╈
# NO-RAW-NEXT: ┌─ y = R0
# NO-RAW-NEXT: 4: add r0, r0, r2 ╈ ┃ ┃ ┻
# NO-RAW-NEXT: 8: bx lr ┻ ┻ ┻
# NO-RAW-EMPTY:
# NO-RAW-NEXT: 0000000c <bar>:
# NO-RAW-NEXT: ┠─ a = R0
# NO-RAW-NEXT: c: add r0, r0, #1 ┃
# NO-RAW-NEXT: 10: bx lr ┻
# NO-RAW-NEXT: ┠─ a = R0
# NO-RAW-NEXT: c: add r0, r0, #1 ┃
# NO-RAW-NEXT: 10: bx lr ┻
# LINE-NUMS: 00000000 <foo>:
# LINE-NUMS-NEXT: ; foo():
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:2 ┠─ a = R0
# LINE-NUMS-NEXT: ┃ ┠─ b = R1
# LINE-NUMS-NEXT: ┃ ┃ ┠─ c = R2
# LINE-NUMS-NEXT: ┃ ┃ ┃ ┌─ x = R0
# LINE-NUMS-NEXT: 0: add r0, r1, r0 ┻ ┃ ┃ ╈
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:3 ┌─ y = R0
# LINE-NUMS-NEXT: 4: add r0, r0, r2 ╈ ┃ ┃ ┻
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:4 ┃ ┃ ┃
# LINE-NUMS-NEXT: 8: bx lr ┻ ┻ ┻
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:2 ┠─ a = R0
# LINE-NUMS-NEXT: ┃ ┠─ b = R1
# LINE-NUMS-NEXT: ┃ ┃ ┠─ c = R2
# LINE-NUMS-NEXT: ┃ ┃ ┃ ┌─ x = R0
# LINE-NUMS-NEXT: 0: add r0, r1, r0 ┻ ┃ ┃ ╈
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:3 ┌─ y = R0
# LINE-NUMS-NEXT: 4: add r0, r0, r2 ╈ ┃ ┃ ┻
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:4 ┃ ┃ ┃
# LINE-NUMS-NEXT: 8: bx lr ┻ ┻ ┻
# LINE-NUMS-EMPTY:
# LINE-NUMS-NEXT: 0000000c <bar>:
# LINE-NUMS-NEXT: ; bar():
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:8 ┠─ a = R0
# LINE-NUMS-NEXT: c: add r0, r0, #1 ┃
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:9 ┃
# LINE-NUMS-NEXT: 10: bx lr ┻
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:8 ┠─ a = R0
# LINE-NUMS-NEXT: c: add r0, r0, #1 ┃
# LINE-NUMS-NEXT: ; SRC_COMPDIR{{[\\/]}}debug.c:9 ┃
# LINE-NUMS-NEXT: 10: bx lr ┻
# SOURCE: 00000000 <foo>:
# SOURCE-NEXT: ; int x = a + b; ┠─ a = R0
# SOURCE-NEXT: ┃ ┠─ b = R1
# SOURCE-NEXT: ┃ ┃ ┠─ c = R2
# SOURCE-NEXT: ┃ ┃ ┃ ┌─ x = R0
# SOURCE-NEXT: 0: add r0, r1, r0 ┻ ┃ ┃ ╈
# SOURCE-NEXT: ; int y = x + c; ┌─ y = R0
# SOURCE-NEXT: 4: add r0, r0, r2 ╈ ┃ ┃ ┻
# SOURCE-NEXT: ; return y; ┃ ┃ ┃
# SOURCE-NEXT: 8: bx lr ┻ ┻ ┻
# SOURCE-NEXT: ; int x = a + b; ┠─ a = R0
# SOURCE-NEXT: ┃ ┠─ b = R1
# SOURCE-NEXT: ┃ ┃ ┠─ c = R2
# SOURCE-NEXT: ┃ ┃ ┃ ┌─ x = R0
# SOURCE-NEXT: 0: add r0, r1, r0 ┻ ┃ ┃ ╈
# SOURCE-NEXT: ; int y = x + c; ┌─ y = R0
# SOURCE-NEXT: 4: add r0, r0, r2 ╈ ┃ ┃ ┻
# SOURCE-NEXT: ; return y; ┃ ┃ ┃
# SOURCE-NEXT: 8: bx lr ┻ ┻ ┻
# SOURCE-EMPTY:
# SOURCE-NEXT: 0000000c <bar>:
# SOURCE-NEXT: ; a++; ┠─ a = R0
# SOURCE-NEXT: c: add r0, r0, #1 ┃
# SOURCE-NEXT: ; return a; ┃
# SOURCE-NEXT: 10: bx lr ┻
# SOURCE-NEXT: ; a++; ┠─ a = R0
# SOURCE-NEXT: c: add r0, r0, #1 ┃
# SOURCE-NEXT: ; return a; ┃
# SOURCE-NEXT: 10: bx lr ┻
# ASCII: 00000000 <foo>:
# ASCII-NEXT: |- a = R0
# ASCII-NEXT: | |- b = R1
# ASCII-NEXT: | | |- c = R2
# ASCII-NEXT: | | | /- x = R0
# ASCII-NEXT: 0: 00 00 81 e0 add r0, r1, r0 v | | ^
# ASCII-NEXT: /- y = R0
# ASCII-NEXT: 4: 02 00 80 e0 add r0, r0, r2 ^ | | v
# ASCII-NEXT: 8: 1e ff 2f e1 bx lr v v v
# ASCII-NEXT: |- a = R0
# ASCII-NEXT: | |- b = R1
# ASCII-NEXT: | | |- c = R2
# ASCII-NEXT: | | | /- x = R0
# ASCII-NEXT: 0: 00 00 81 e0 add r0, r1, r0 v | | ^
# ASCII-NEXT: /- y = R0
# ASCII-NEXT: 4: 02 00 80 e0 add r0, r0, r2 ^ | | v
# ASCII-NEXT: 8: 1e ff 2f e1 bx lr v v v
# ASCII-EMPTY:
# ASCII-NEXT: 0000000c <bar>:
# ASCII-NEXT: |- a = R0
# ASCII-NEXT: c: 01 00 80 e2 add r0, r0, #1 |
# ASCII-NEXT: 10: 1e ff 2f e1 bx lr v
# ASCII-NEXT: |- a = R0
# ASCII-NEXT: c: 01 00 80 e2 add r0, r0, #1 |
# ASCII-NEXT: 10: 1e ff 2f e1 bx lr v
.text
.syntax unified

6
llvm/test/tools/llvm-objdump/ELF/ARM/debug-vars-wide-chars.s
View File

@ -13,9 +13,9 @@
## characters.
# CHECK: 00000000 <foo>:
# CHECK-NEXT: ; return *喵; ┠─ 喵 = R0
# CHECK-NEXT: 0: 00 00 90 e5 ldr r0, [r0] ┻
# CHECK-NEXT: 4: 1e ff 2f e1 bx lr
# CHECK-NEXT: ; return *喵; ┠─ 喵 = R0
# CHECK-NEXT: 0: 00 00 90 e5 ldr r0, [r0] ┻
# CHECK-NEXT: 4: 1e ff 2f e1 bx lr
.text
.syntax unified

56
llvm/test/tools/llvm-objdump/X86/disassemble-print-comments.s
View File

@ -7,7 +7,63 @@
# CHECK-NEXT: 0: nop
# CHECK-NEXT: 1: cmpl $305419896, %eax # imm = 0x12345678
## Check that comments and locations of variables can be printed together.
# RUN: llvm-objdump -d --debug-vars --no-show-raw-insn %t | \
# RUN: FileCheck %s --check-prefix=DBGVARS
# DBGVARS: 0000000000000000 <foo>:
# DBGVARS-NEXT: ┠─ bar = RDX
# DBGVARS-NEXT: 0: nop ┃
# DBGVARS-NEXT: 1: cmpl $305419896, %eax # imm = 0x12345678 ┻
.text
foo:
nop
cmpl $0x12345678, %eax
.LFooEnd:
.section .debug_abbrev,"",@progbits
.uleb128 1 # Abbreviation Code
.uleb128 0x11 # DW_TAG_compile_unit
.byte 1 # DW_CHILDREN_yes
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.uleb128 2 # Abbreviation Code
.uleb128 0x2e # DW_TAG_subprogram
.byte 1 # DW_CHILDREN_yes
.uleb128 0x11 # DW_AT_low_pc
.uleb128 0x01 # DW_FORM_addr
.uleb128 0x12 # DW_AT_high_pc
.uleb128 0x06 # DW_FORM_data4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.uleb128 3 # Abbreviation Code
.uleb128 0x34 # DW_TAG_variable
.byte 0 # DW_CHILDREN_no
.uleb128 0x02 # DW_AT_location
.uleb128 0x18 # DW_FORM_exprloc
.uleb128 0x03 # DW_AT_name
.uleb128 0x08 # DW_FORM_string
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_info,"",@progbits
.long .LCuEnd-.LCuBegin # Length of Unit
.LCuBegin:
.short 4 # DWARF version number
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 8 # Address Size
.uleb128 1 # Abbrev [1] DW_TAG_compile_unit
.uleb128 2 # Abbrev [2] DW_TAG_subprogram
.quad foo # DW_AT_low_pc
.long .LFooEnd-foo # DW_AT_high_pc
.uleb128 3 # Abbrev [3] DW_TAG_variable
.byte .LLocEnd-.LLocBegin # DW_AT_location
.LLocBegin:
.byte 0x51 # DW_OP_reg1
.LLocEnd:
.asciz "bar" # DW_FORM_string
.byte 0 # End Of Children Mark
.byte 0 # End Of Children Mark
.LCuEnd:

2
llvm/tools/llvm-objdump/llvm-objdump.cpp
View File

@ -221,7 +221,7 @@ uint32_t objdump::PrefixStrip;
DebugVarsFormat objdump::DbgVariables = DVDisabled;
int objdump::DbgIndent = 40;
int objdump::DbgIndent = 52;
static StringSet<> DisasmSymbolSet;
StringSet<> objdump::FoundSectionSet;