[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/AArch64/arm64-stackmap.ll b/llvm/test/CodeGen/AArch64/arm64-stackmap.ll
index 3eb1d27..0b2e977 100644
--- a/llvm/test/CodeGen/AArch64/arm64-stackmap.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-stackmap.ll
@@ -10,7 +10,7 @@
; CHECK-LABEL: .section __LLVM_STACKMAPS,__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
@@ -23,26 +23,37 @@
; Functions and stack size
; CHECK-NEXT: .quad _constantargs
; CHECK-NEXT: .quad 16
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _osrinline
; CHECK-NEXT: .quad 32
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _osrcold
; CHECK-NEXT: .quad 16
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _propertyRead
; CHECK-NEXT: .quad 16
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _propertyWrite
; CHECK-NEXT: .quad 16
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _jsVoidCall
; CHECK-NEXT: .quad 16
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _jsIntCall
; CHECK-NEXT: .quad 16
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _spilledValue
; CHECK-NEXT: .quad 160
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _spilledStackMapValue
; CHECK-NEXT: .quad 128
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _liveConstant
; CHECK-NEXT: .quad 16
+; CHECK-NEXT: .quad 1
; CHECK-NEXT: .quad _clobberLR
; CHECK-NEXT: .quad 112
+; CHECK-NEXT: .quad 1
; Num LargeConstants
; CHECK-NEXT: .quad 4294967295