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Clang recently improved its DWARF support for C VLA types. The DWARF
now looks like this:
0x00000051: DW_TAG_variable [4]
DW_AT_location( fbreg -32 )
DW_AT_name( "__vla_expr" )
DW_AT_type( {0x000000d3} ( long unsigned int ) )
DW_AT_artificial( true )
...
0x000000da: DW_TAG_array_type [10] *
DW_AT_type( {0x000000cc} ( int ) )
0x000000df: DW_TAG_subrange_type [11]
DW_AT_type( {0x000000e9} ( __ARRAY_SIZE_TYPE__ ) )
DW_AT_count( {0x00000051} )
Without this patch LLDB will naively interpret the DIE offset 0x51 as
the static size of the array, which is clearly wrong. This patch
extends ValueObject::GetNumChildren to query the dynamic properties of
incomplete array types.
See the testcase for an example:
4 int foo(int a) {
5 int vla[a];
6 for (int i = 0; i < a; ++i)
7 vla[i] = i;
8
-> 9 pause(); // break here
10 return vla[a-1];
11 }
(lldb) fr v vla
(int []) vla = ([0] = 0, [1] = 1, [2] = 2, [3] = 3)
(lldb) quit
rdar://problem/21814005
Differential Revision: https://reviews.llvm.org/D53530
llvm-svn: 346165
26 lines
819 B
Python
26 lines
819 B
Python
import lldb
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from lldbsuite.test.lldbtest import *
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import lldbsuite.test.lldbutil as lldbutil
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class TestVLA(TestBase):
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mydir = TestBase.compute_mydir(__file__)
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def test_vla(self):
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self.build()
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_, process, _, _ = lldbutil.run_to_source_breakpoint(
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self, "break here", lldb.SBFileSpec('main.c'))
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def test(a, array):
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for i in range(a):
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self.expect("fr v vla[%d]"%i, substrs=["int", "%d"%(a-i)])
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self.expect("expr vla[%d]"%i, substrs=["int", "%d"%(a-i)])
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self.expect("frame var vla", substrs=array)
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self.expect("expr vla", error=True, substrs=["incomplete"])
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test(2, ["int []", "[0] = 2, [1] = 1"])
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process.Continue()
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test(4, ["int []", "[0] = 4, [1] = 3, [2] = 2, [3] = 1"])
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