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78 lines
2.7 KiB
78 lines
2.7 KiB
4 months ago
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// XFAIL:*
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//// Suboptimal coverage, see description below.
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// REQUIRES: lldb
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// UNSUPPORTED: system-windows
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// RUN: %dexter --fail-lt 1.0 -w --debugger lldb \
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// RUN: --builder 'clang-c' --cflags "-O3 -glldb" -- %s
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//// Adapted from https://bugs.llvm.org/show_bug.cgi?id=34136#c1
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//// LowerDbgDeclare has since been updated to look through bitcasts. We still
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//// get suboptimal coverage at the beginning of 'main' though. For each local,
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//// LowerDbgDeclare inserts a dbg.value and a dbg.value+DW_OP_deref before the
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//// store (after the call to 'getint') and the call to 'alias' respectively.
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//// The first dbg.value describes the result of the 'getint' call, eventually
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//// becoming a register location. The second points back into the stack
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//// home. There is a gap in the coverage between the quickly clobbered register
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//// location and the stack location, even though the stack location is valid
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//// during that gap. For x86 we end up with this code at the start of main:
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//// 00000000004004b0 <main>:
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//// 4004b0: sub rsp,0x18
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//// 4004b4: mov edi,0x5
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//// 4004b9: call 400480 <getint>
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//// 4004be: mov DWORD PTR [rsp+0x14],eax
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//// 4004c2: mov edi,0x5
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//// 4004c7: call 400480 <getint>
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//// 4004cc: mov DWORD PTR [rsp+0x10],eax
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//// 4004d0: mov edi,0x5
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//// 4004d5: call 400480 <getint>
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//// 4004da: mov DWORD PTR [rsp+0xc],eax
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//// ...
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//// With these variable locations:
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//// DW_TAG_variable
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//// DW_AT_location (0x00000000:
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//// [0x00000000004004be, 0x00000000004004cc): DW_OP_reg0 RAX
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//// [0x00000000004004de, 0x0000000000400503): DW_OP_breg7 RSP+20)
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//// DW_AT_name ("x")
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//// ...
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//// DW_TAG_variable
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//// DW_AT_location (0x00000037:
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//// [0x00000000004004cc, 0x00000000004004da): DW_OP_reg0 RAX
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//// [0x00000000004004e8, 0x0000000000400503): DW_OP_breg7 RSP+16)
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//// DW_AT_name ("y")
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//// ...
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//// DW_TAG_variable
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//// DW_AT_location (0x0000006e:
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//// [0x00000000004004da, 0x00000000004004e8): DW_OP_reg0 RAX
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//// [0x00000000004004f2, 0x0000000000400503): DW_OP_breg7 RSP+12)
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//// DW_AT_name ("z")
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//// ...
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char g = 1;
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int five = 5;
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__attribute__((__noinline__))
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int getint(int x) {
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g = x - 4;
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return x * g;
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}
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__attribute__((__noinline__))
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void alias(char* c) {
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g = *c;
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*c = (char)five;
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}
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int main() {
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int x = getint(5);
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int y = getint(5); // DexLabel('s1')
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int z = getint(5); // DexLabel('s2')
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alias((char*)&x); // DexLabel('s3')
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alias((char*)&y);
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alias((char*)&z);
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return 0; // DexLabel('s4')
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}
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// DexExpectWatchValue('x', '5', from_line='s1', to_line='s4')
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// DexExpectWatchValue('y', '5', from_line='s2', to_line='s4')
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// DexExpectWatchValue('z', '5', from_line='s3', to_line='s4')
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