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# Dummy program that we patch to generate a dwp file with more than 4GB of
# .debug_info.
# Generate 2 dummy files that result in DWARF blocks.
$ for (( i = 1; i <= 2; i++ )); do echo 'constexpr int filler'$i'[] = { 1 };' > filler$i.cc; done
$ g++ -O2 -g -gsplit-dwarf -fdebug-types-section -dA -S filler{1,2}.cc foo.cc bar.cc main.cc
# Patch the DWARF blocks to be 2GB.
$ for (( i = 1; i <= 2; i++ )); do patch -p1 << EOF
--- a/filler$i.s
+++ b/filler$i.s
@@ -7,5 +7,5 @@
.section .debug_info.dwo,"e",@progbits
.Ldebug_info0:
- .long 0x49 # Length of Compilation Unit Info
+ .long 0x80000048 # Length of Compilation Unit Info
.value 0x5 # DWARF version number
.byte 0x5 # DW_UT_split_compile
@@ -51,9 +51,6 @@
.long 0x29 # DW_AT_type
# DW_AT_const_expr
- .byte 0x4 # DW_AT_const_value
- .byte 0x1 # fp or vector constant word 0
- .byte 0 # fp or vector constant word 1
- .byte 0 # fp or vector constant word 2
- .byte 0 # fp or vector constant word 3
+ .long 0x80000000 # DW_AT_const_value
+ .fill 0x80000000
.byte 0 # end of children of DIE 0x14
.section .debug_info,"",@progbits
@@ -171,5 +168,5 @@
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x1c # (DW_AT_const_value)
- .uleb128 0xa # (DW_FORM_block1)
+ .uleb128 0x4 # (DW_FORM_block4)
.byte 0
.byte 0
EOF
done
$ for (( i = 1; i <= 2; i++ )); do as filler$i.s -o filler$i.o; done
$ as foo.s -o foo.o
$ as bar.s -o bar.o
$ as main.s -o main.o
$ g++ filler1.o foo.o filler2.o bar.o main.o -o testfile-dwp-5-cu-index-overflow
# -continue-on-cu-index-overflow was added in LLVM 17:
# https://reviews.llvm.org/D144565.
$ llvm-dwp -continue-on-cu-index-overflow filler1.o foo.o filler2.o bar.o main.o -o testfile-dwp-5-cu-index-overflow.dwp
# Same thing for DWARF 4.
$ g++ -O2 -g -gdwarf-4 -gsplit-dwarf -fdebug-types-section -dA -S filler{1,2}.cc foo.cc bar.cc main.cc
$ for (( i = 1; i <= 2; i++ )); do patch -p1 << EOF
--- a/filler$i.s
+++ b/filler$i.s
@@ -6,5 +6,5 @@
.section .debug_info.dwo,"e",@progbits
.Ldebug_info0:
- .long 0x48 # Length of Compilation Unit Info
+ .long 0x80000047 # Length of Compilation Unit Info
.value 0x4 # DWARF version number
.long .Ldebug_abbrev0 # Offset Into Abbrev. Section
@@ -49,9 +49,6 @@
.long 0x28 # DW_AT_type
# DW_AT_const_expr
- .byte 0x4 # DW_AT_const_value
- .byte 0x1 # fp or vector constant word 0
- .byte 0 # fp or vector constant word 1
- .byte 0 # fp or vector constant word 2
- .byte 0 # fp or vector constant word 3
+ .long 0x80000000 # DW_AT_const_value
+ .fill 0x80000000
.byte 0 # end of children of DIE 0xb
.section .debug_info,"",@progbits
@@ -172,5 +169,5 @@
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x1c # (DW_AT_const_value)
- .uleb128 0xa # (DW_FORM_block1)
+ .uleb128 0x4 # (DW_FORM_block4)
.byte 0
.byte 0
EOF
done
$ for (( i = 1; i <= 2; i++ )); do as filler$i.s -o filler$i.o; done
$ as foo.s -o foo.o
$ as bar.s -o bar.o
$ as main.s -o main.o
$ g++ filler1.o foo.o filler2.o bar.o main.o -o testfile-dwp-4-cu-index-overflow
$ llvm-dwp -continue-on-cu-index-overflow filler1.o foo.o filler2.o bar.o main.o -o testfile-dwp-4-cu-index-overflow.dwp
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