[Stackmap] Added callsite counts to emitted function information.
Summary:
It was previously not possible for tools to use solely the stackmap
information emitted to reconstruct the return addresses of callsites in
the map, which is necessary to use the information to walk a stack. This
patch adds per-function callsite counts when emitting the stackmap
section in order to resolve the problem. Note that this slightly alters
the stackmap format, so external tools parsing these maps will need to
be updated.
**Problem Details:**
Records only store their offset from the beginning of the function they
belong to. While these records and the functions are output in program
order, it is not possible to determine where the end of one function's
records are without the callsite count when processing the records to
compute return addresses.
Patch by Kavon Farvardin!
Reviewers: atrick, ributzka, sanjoy
Subscribers: nemanjai
Differential Revision: https://reviews.llvm.org/D23487
llvm-svn: 281532
diff --git a/llvm/test/CodeGen/PowerPC/ppc64-stackmap.ll b/llvm/test/CodeGen/PowerPC/ppc64-stackmap.ll
index a77339f..854cee2 100644
--- a/llvm/test/CodeGen/PowerPC/ppc64-stackmap.ll
+++ b/llvm/test/CodeGen/PowerPC/ppc64-stackmap.ll
@@ -44,7 +44,7 @@
; CHECK-LABEL: .section .llvm_stackmaps
; CHECK-NEXT: __LLVM_StackMaps:
; Header
-; CHECK-NEXT: .byte 1
+; CHECK-NEXT: .byte 2
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .short 0
; Num Functions
@@ -57,26 +57,37 @@
; Functions and stack size
; CHECK-NEXT: .quad constantargs
; CHECK-NEXT: .quad 128
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad osrinline
; CHECK-NEXT: .quad 144
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad osrcold
; CHECK-NEXT: .quad 128
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad propertyRead
; CHECK-NEXT: .quad 128
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad propertyWrite
; CHECK-NEXT: .quad 128
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad jsVoidCall
; CHECK-NEXT: .quad 128
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad jsIntCall
; CHECK-NEXT: .quad 128
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad spilledValue
; CHECK-NEXT: .quad 304
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad spilledStackMapValue
; CHECK-NEXT: .quad 224
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad liveConstant
; CHECK-NEXT: .quad 64
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad clobberLR
; CHECK-NEXT: .quad 208
+; CHECK-NEXT: .quad 1
; Num LargeConstants
; CHECK-NEXT: .quad 4294967295