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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
99 lines
3.2 KiB
ArmAsm
99 lines
3.2 KiB
ArmAsm
# RUN: llvm-mc -triple=i686-pc-win32 -filetype=obj < %s | llvm-readobj -codeview -codeview-subsection-bytes | 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 _g;
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.scl 2;
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.type 32;
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.endef
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.globl _g
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.p2align 4, 0x90
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_g: # @g
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Lfunc_begin0:
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.cv_file 1 "\\usr\\local\\google\\home\\majnemer\\llvm\\src\\<stdin>"
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.cv_func_id 0
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.cv_loc 0 1 3 0 is_stmt 0 # <stdin>:3:0
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# BB#0: # %entry
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pushl %ebp
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movl %esp, %ebp
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subl $8, %esp
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leal -4(%ebp), %eax
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Lvar_begin0:
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#DEBUG_VALUE: g:x <- %EAX
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.cv_loc 0 1 4 7 # <stdin>:4:7
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movl $0, -4(%ebp)
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.cv_loc 0 1 5 3 # <stdin>:5:3
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movl %eax, (%esp)
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calll _f
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.cv_loc 0 1 6 1 # <stdin>:6:1
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Lvar_end0:
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addl $8, %esp
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popl %ebp
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retl
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Lfunc_end0:
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.section .debug$T,"dr"
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.long 4 # Debug section magic
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.short 6 # Type record length
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.short 4609 # Leaf type: LF_ARGLIST
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.long 0 # Number of arguments
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.short 14 # Type record length
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.short 4104 # Leaf type: LF_PROCEDURE
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.long 3 # Return type index
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.byte 0 # Calling convention
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.byte 0 # Function options
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.short 0 # # of parameters
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.long 4096 # Argument list type index
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.short 12 # Type record length
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.short 5633 # Leaf type: LF_FUNC_ID
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.long 0 # Scope type index
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.long 4097 # Function type
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.asciz "g" # Function name
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.section .debug$S,"dr"
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.long 4 # Debug section magic
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.long 241 # Symbol subsection for g
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.long Ltmp1-Ltmp0 # Subsection size
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Ltmp0:
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.short Ltmp3-Ltmp2 # Record length
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Ltmp2:
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.short 4423 # Record kind: S_GPROC32_ID
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.long 0 # PtrParent
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.long 0 # PtrEnd
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.long 0 # PtrNext
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.long Lfunc_end0-_g # Code size
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.long 0 # Offset after prologue
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.long 0 # Offset before epilogue
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.long 0 # Function type index
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.secrel32 _g # Function section relative address
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.secidx _g # Function section index
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.byte 0 # Flags
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.asciz "g" # Function name
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Ltmp3:
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.short 2 # Record length
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.short 4431 # Record kind: S_PROC_ID_END
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.cv_def_range Lvar_begin0 Lvar_end0, "\102\021\374\377\377\377"
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# CHECK: DefRangeFramePointerRel {
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# CHECK: Offset: -4
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# CHECK: LocalVariableAddrRange {
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# CHECK: OffsetStart: .text+0x9
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# CHECK: ISectStart: 0x0
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# CHECK: Range: 0xF
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# CHECK: }
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# CHECK: }
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# CHECK: BlockRelocations [
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# CHECK: 0x4 IMAGE_REL_I386_SECREL .text
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# CHECK: 0x8 IMAGE_REL_I386_SECTION .text
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# CHECK: ]
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Ltmp1:
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.p2align 2
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.cv_linetable 0, _g, 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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