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[AsmWriter] Construct SlotTracker with the function

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This patch teaches BasicBlock::print to construct an instance of
SlotTracker with the containing function.

Without this patch, we dump:

*** IR Dump After LoopInstSimplifyPass ***
; Preheader:
  br label %1

; Loop:
<badref>:                                         ; preds = %1, %0
  br label %1

Note "<badref>" above.  This happens because BasicBlock::print calls:

  SlotTracker SlotTable(this->getModule());

Note that this constructor does not add the contents of functions to
the slot table.  That is, basic blocks are left unnumbered.

This patch fixes the problem by switching to:

  SlotTracker SlotTable(this->getParent());

which does add the contents of the Module and the function,
this->getParent(), to the slot table.

Differential Revision: https://reviews.llvm.org/D89567
This commit is contained in:
Kazu Hirata 2020-10-20 15:01:39 -07:00
parent 652c96c70e
commit c31e34345d
2 changed files with 15 additions and 1 deletions
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2
lib/IR/AsmWriter.cpp
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@ -4417,7 +4417,7 @@ void Function::print(raw_ostream &ROS, AssemblyAnnotationWriter *AAW,
void BasicBlock::print(raw_ostream &ROS, AssemblyAnnotationWriter *AAW,
bool ShouldPreserveUseListOrder,
bool IsForDebug) const {
SlotTracker SlotTable(this->getModule());
SlotTracker SlotTable(this->getParent());
formatted_raw_ostream OS(ROS);
AssemblyWriter W(OS, SlotTable, this->getModule(), AAW,
IsForDebug,

14
test/Other/bb-badref.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: opt -passes=loop-instsimplify -print-after-all -disable-output -S < %s 2>&1 | FileCheck %s
; loop-instsimplify dumps individual basic blocks as part of a loop,
; not a function. Verify that the non-entry basic block is labeled as
; "1", not "<badref>".
; CHECK-NOT: <badref>
define void @foo() {
br label %1
1:
br label %1
}