Revert "[LiveDebugValues] Introduce entry values of unmodified params"

This reverts commit rG4cfceb910692 due to LLDB test failing.

Author: djtodoro

lldb/packages/Python/lldbsuite/test/functionalities/param_entry_vals/basic_entry_values_x86_64/TestBasicEntryValuesX86_64.py

@@ -6,7 +6,8 @@
 supported_platforms.extend(lldbplatformutil.getDarwinOSTriples())
 
 lldbinline.MakeInlineTest(__file__, globals(),
-        [decorators.skipUnlessPlatform(supported_platforms),
+        [decorators.skipIf(bugnumber="llvm.org/pr44059"),
+         decorators.skipUnlessPlatform(supported_platforms),
          decorators.skipIf(compiler="clang", compiler_version=['<', '10.0']),
          decorators.skipUnlessArch('x86_64'),
          decorators.skipUnlessHasCallSiteInfo,

lldb/packages/Python/lldbsuite/test/functionalities/param_entry_vals/basic_entry_values_x86_64/main.cpp

@@ -18,14 +18,6 @@ template<typename T> __attribute__((noinline)) void use(T x) {
       /* Clobbers */ : "rsi" \
   );
 
-// Destroy %rbx in the current frame.
-#define DESTROY_RBX \
-  asm volatile ("xorq %%rbx, %%rbx" \
-      /* Outputs */  : \
-      /* Inputs */   : \
-      /* Clobbers */ : "rbx" \
-  );
-
 struct S1 {
   int field1 = 123;
   int *field2 = &field1;
@@ -38,17 +30,10 @@ void func1(int &sink, int x) {
   // Destroy 'x' in the current frame.
   DESTROY_RSI;
 
-  // NOTE: Currently, we do not generate DW_OP_entry_value for the 'x',
-  // since it gets copied into a register that is not callee saved,
-  // and we can not guarantee that its value has not changed.
+  //% self.filecheck("image lookup -va $pc", "main.cpp", "-check-prefix=FUNC1-DESC")
+  // FUNC1-DESC: name = "x", type = "int", location = DW_OP_entry_value(DW_OP_reg4 RSI)
 
   ++sink;
-
-  // Destroy 'sink' in the current frame.
-  DESTROY_RBX;
-
-  //% self.filecheck("image lookup -va $pc", "main.cpp", "-check-prefix=FUNC1-DESC")
-  // FUNC1-DESC: name = "sink", type = "int &", location = DW_OP_entry_value(DW_OP_reg5 RDI)
 }
 
 __attribute__((noinline))
@@ -58,16 +43,10 @@ void func2(int &sink, int x) {
   // Destroy 'x' in the current frame.
   DESTROY_RSI;
 
-  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC2-EXPR-FAIL", expect_cmd_failure=True)
-  // FUNC2-EXPR-FAIL: couldn't get the value of variable x: variable not available
+  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC2-EXPR")
+  // FUNC2-EXPR: (int) ${{.*}} = 123
 
   ++sink;
-
-  // Destroy 'sink' in the current frame.
-  DESTROY_RBX;
-
-  //% self.filecheck("expr sink", "main.cpp", "-check-prefix=FUNC2-EXPR")
-  // FUNC2-EXPR: ${{.*}} = 2
 }
 
 __attribute__((noinline))
@@ -90,16 +69,10 @@ void func4_amb(int &sink, int x) {
   // Destroy 'x' in the current frame.
   DESTROY_RSI;
 
-  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC4-EXPR-FAIL", expect_cmd_failure=True)
-  // FUNC4-EXPR-FAIL: couldn't get the value of variable x: variable not available
+  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC4-EXPR", expect_cmd_failure=True)
+  // FUNC4-EXPR: couldn't get the value of variable x: Could not evaluate DW_OP_entry_value.
 
   ++sink;
-
-  // Destroy 'sink' in the current frame.
-  DESTROY_RBX;
-
-  //% self.filecheck("expr sink", "main.cpp", "-check-prefix=FUNC4-EXPR", expect_cmd_failure=True)
-  // FUNC4-EXPR: couldn't get the value of variable sink: Could not evaluate DW_OP_entry_value.
 }
 
 __attribute__((noinline))
@@ -125,16 +98,10 @@ void func7(int &sink, int x) {
   // Destroy 'x' in the current frame.
   DESTROY_RSI;
 
-  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC7-EXPR-FAIL", expect_cmd_failure=True)
-  // FUNC7-EXPR-FAIL: couldn't get the value of variable x: variable not available
+  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC7-EXPR")
+  // FUNC7-EXPR: (int) ${{.*}} = 123
 
   ++sink;
-
-  // Destroy 'sink' in the current frame.
-  DESTROY_RBX;
-
-  //% self.filecheck("expr sink", "main.cpp", "-check-prefix=FUNC7-EXPR")
-  // FUNC7-EXPR: ${{.*}} = 4
 }
 
 __attribute__((always_inline))
@@ -162,16 +129,10 @@ void func11_tailcalled(int &sink, int x) {
   // Destroy 'x' in the current frame.
   DESTROY_RSI;
 
-  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC11-EXPR-FAIL", expect_cmd_failure=True)
-  // FUNC11-EXPR-FAIL: couldn't get the value of variable x: variable not available
+  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC11-EXPR")
+  // FUNC11-EXPR: (int) ${{.*}} = 123
 
   ++sink;
-
-  // Destroy 'sink' in the current frame.
-  DESTROY_RBX;
-
-  //% self.filecheck("expr sink", "main.cpp", "-check-prefix=FUNC11-EXPR")
-  // FUNC11-EXPR: ${{.*}} = 5
 }
 
 __attribute__((noinline))
@@ -189,16 +150,10 @@ void func13(int &sink, int x) {
   // Destroy 'x' in the current frame.
   DESTROY_RSI;
 
-  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC13-EXPR-FAIL", expect_cmd_failure=True)
-  // FUNC13-EXPR-FAIL: couldn't get the value of variable x: variable not available
-
-  use(sink);
+  //% self.filecheck("expr x", "main.cpp", "-check-prefix=FUNC13-EXPR")
+  // FUNC13-EXPR: (int) ${{.*}} = 123
 
-  // Destroy 'sink' in the current frame.
-  DESTROY_RBX;
-
-  //% self.filecheck("expr sink", "main.cpp", "-check-prefix=FUNC13-EXPR")
-  // FUNC13-EXPR: ${{.*}} = 5
+  ++sink;
 }
 
 __attribute__((noinline, disable_tail_calls))