MIR Serialization: Serialize the variable sized stack objects.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242095 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/MIR/X86/variable-sized-stack-object-size-error.mir

@@ -0,0 +1,36 @@
+# RUN: not llc -march=x86-64 -start-after branch-folder -stop-after branch-folder -o /dev/null %s 2>&1 | FileCheck %s
+--- |
+
+  define i32 @test(i32 %a) {
+  entry:
+    %b = alloca i32
+    %x = alloca i64
+    %y = alloca i32, i32 %a
+    store i32 %a, i32* %b
+    store i64 2, i64* %x
+    %c = load i32, i32* %b
+    ret i32 %c
+  }
+
+...
+---
+name:            test
+frameInfo:
+  stackSize:       24
+  offsetAdjustment: -16
+  maxAlignment:    8
+  adjustsStack:    true
+stack:
+  - { id: 0, offset: -20, size: 4, alignment: 4 }
+  - { id: 1, offset: -32, size: 8, alignment: 8 }
+  # CHECK: [[@LINE+1]]:55: unknown key 'size'
+  - { id: 2, type: variable-sized, offset: -32, size: 42, alignment: 1 }
+body:
+  - id:          0
+    name:        entry
+    instructions:
+      - 'MOV32mr %rsp, 1, _, -4, _, %edi'
+      - 'MOV64mi32 %rsp, 1, _, -16, _, 2'
+      - '%eax = MOV32rm %rsp, 1, _, -4, _'
+      - 'RETQ %eax'
+...

test/CodeGen/MIR/X86/variable-sized-stack-objects.mir

@@ -0,0 +1,42 @@
+# RUN: llc -march=x86-64 -start-after branch-folder -stop-after branch-folder -o /dev/null %s | FileCheck %s
+# This test ensures that the MIR parser parses variable sized stack objects
+# correctly.
+
+--- |
+
+  define i32 @test(i32 %a) {
+  entry:
+    %b = alloca i32
+    %x = alloca i64
+    %y = alloca i32, i32 %a
+    store i32 %a, i32* %b
+    store i64 2, i64* %x
+    %c = load i32, i32* %b
+    ret i32 %c
+  }
+
+...
+---
+name:            test
+frameInfo:
+  stackSize:       24
+  offsetAdjustment: -16
+  maxAlignment:    8
+  adjustsStack:    true
+# CHECK: stack:
+# CHECK-NEXT: - { id: 0, offset: -20, size: 4, alignment: 4 }
+# CHECK-NEXT: - { id: 1, offset: -32, size: 8, alignment: 8 }
+# CHECK-NEXT: - { id: 2, type: variable-sized, offset: -32, alignment: 1 }
+stack:
+  - { id: 0, offset: -20, size: 4, alignment: 4 }
+  - { id: 1, offset: -32, size: 8, alignment: 8 }
+  - { id: 2, type: variable-sized, offset: -32, alignment: 1 }
+body:
+  - id:          0
+    name:        entry
+    instructions:
+      - 'MOV32mr %rsp, 1, _, -4, _, %edi'
+      - 'MOV64mi32 %rsp, 1, _, -16, _, 2'
+      - '%eax = MOV32rm %rsp, 1, _, -4, _'
+      - 'RETQ %eax'
+...