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bdfdb24819
Summary:
Previously we were trying to represent this with the "contains" list of
the .cv_inline_linetable directive, which was not enough information.
Now we directly represent the chain of inlined call sites, so we know
what location to emit when we encounter a .cv_loc directive of an inner
inlined call site while emitting the line table of an outer function or
inlined call site. Fixes PR29146.
Also fixes PR29147, where we would crash when .cv_loc directives crossed
sections. Now we write down the section of the first .cv_loc directive,
and emit an error if any other .cv_loc directive for that function is in
a different section.
Also fixes issues with discontiguous inlined source locations, like in
this example:
volatile int unlikely_cond = 0;
extern void __declspec(noreturn) abort();
__forceinline void f() {
if (!unlikely_cond) abort();
}
int main() {
unlikely_cond = 0;
f();
unlikely_cond = 0;
}
Previously our tables gave bad location information for the 'abort'
call, and the debugger wouldn't snow the inlined stack frame for 'f'.
It is important to emit good line tables for this code pattern, because
it comes up whenever an asan bug occurs in an inlined function. The
__asan_report* stubs are generally placed after the normal function
epilogue, leading to discontiguous regions of inlined code.
Reviewers: majnemer, amccarth
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D24014
llvm-svn: 280822
84 lines
1.6 KiB
ArmAsm
84 lines
1.6 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple i686-pc-win32 < %s | llvm-readobj -codeview - | FileCheck %s
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.text
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.def @feat.00;
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.scl 3;
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.type 0;
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.endef
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.globl @feat.00
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@feat.00 = 1
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.def _f;
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.scl 2;
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.type 32;
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.endef
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.globl _f
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.p2align 4, 0x90
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_f: # @f
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Lfunc_begin0:
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# BB#0: # %entry
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.cv_file 1 "cv-empty-linetable.s"
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.cv_func_id 1
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.cv_loc 1 1 3 15 is_stmt 0
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jmp _g # TAILCALL
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Lfunc_end0:
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.section .debug$T,"dr"
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.long 4
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.short 6
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.short 4609
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.long 0
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.short 14
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.short 4104
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.asciz "\003\000\000\000\000\000\000\000\000\020\000"
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.short 14
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.short 5633
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.asciz "\000\000\000\000\001\020\000"
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.ascii "fn1"
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.byte 0
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.short 38
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.short 5633
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.asciz "\000\000\000\000\001\020\000"
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.ascii "??__Fa@?1??fn1@@YAXXZ@YAXXZ"
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.byte 0
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.short 26
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.short 5633
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.asciz "\000\000\000\000\001\020\000"
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.ascii "vector::~vector"
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.byte 0
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.section .debug$S,"dr"
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.long 4
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.long 241 # Symbol subsection for f
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.long Ltmp1-Ltmp0
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Ltmp0:
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.short Ltmp3-Ltmp2
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Ltmp2:
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.short 4423
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.zero 12
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.long Lfunc_end0-_f
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.zero 12
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.secrel32 _f
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.secidx _f
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.byte 0
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.byte 102
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.byte 0
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Ltmp3:
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.short Ltmp5-Ltmp4
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Ltmp4:
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.short 4429
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.asciz "\000\000\000\000\000\000\000\000\004\020\000"
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Ltmp5:
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.short 2
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.short 4430
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.short 2
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.short 4431
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Ltmp1:
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.zero 3
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.cv_linetable 0, _f, Lfunc_end0
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.cv_filechecksums # File index to string table offset subsection
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.cv_stringtable # String table
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# CHECK: FunctionLineTable [
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# CHECK: LinkageName: _f
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# CHECK: Flags: 0x0
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# CHECK: CodeSize: 0x5
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# CHECK: ]
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