40 lines
1.6 KiB
Plaintext
40 lines
1.6 KiB
Plaintext
# REQUIRES: x86
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# REQUIRES: lld
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# RUN: %clang -target x86_64-pc-linux -g -O0 %S/Inputs/subprogram_ranges.s -o %t.o -c
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# RUN: ld.lld %t.o -o %t
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# RUN: %lldb -b -s %s %t 2>&1 | FileCheck %s
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# Test breaking on symbols and printing variables when a DW_TAG_subprogram uses
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# DW_AT_ranges instead of DW_AT_low_pc/DW_AT_high_pc. While the assembly here
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# is a bit unrealistic - it's a single-entry range using DWARFv4 which isn't
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# useful for anything (a single-entry range with DWARFv5 can reduce address
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# relocations, and multi-entry ranges can be used for function sections), but
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# it's the simplest thing to test. If anyone's updating this test at some
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# point, feel free to replace it with another equivalent test if it's
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# especially useful, but don't dismiss it as pointless just because it's a bit
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# weird.
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# * Using volatile writes to create instructions the location may be valid over
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# * Using two values for the variable so it is described by a location list,
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# not a single location description
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# * Not using function calls, so that the function has no frame pointer
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# initialization/no prologue instructions, so the location of "var" is valid
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# at the start of the function, so 'image lookup -v -s main' will include it.
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#
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# Source:
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# __attribute__((nodebug)) volatile int i;
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# int main() {
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# int var = 3;
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# i = 1;
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# var = 5;
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# i = 2;
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# }
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b main
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# CHECK: (lldb) b main
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# CHECK-NEXT: Breakpoint 1: where = {{.*}}`main at subprogram_ranges.c:4:5
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image lookup -v -s main
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# CHECK: 1 symbols match 'main'
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# CHECK: Variable: {{.*}}, name = "var", type = "int", {{.*}}, decl = subprogram_ranges.c:3
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