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TheRock/compiler/amd-llvm/lldb/test/Shell/Expr/TestProcessModificationIdOnExpr.cpp
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derek.holloway 7502bf64a4
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// Tests that ProcessModID.m_memory_id is not bumped when evaluating expressions without side effects.
// REQUIRES: target-windows && (target-x86 || target-x86_64)
// Due to different implementations exact numbers (m_stop_id) are different on different OSs. So we lock this test to specific platform (Windows). It is limited to x86/x64 because on x86/x64, running get()
// requires that we write the return address to the stack, this does not happen on AArch64.
// RUN: %build %s -o %t
// RUN: %lldb %t \
// RUN: -o "settings set target.process.track-memory-cache-changes false" \
// RUN: -o "run" \
// RUN: -o "process status -d" \
// RUN: -o "expr x.i != 42" \
// RUN: -o "process status -d" \
// RUN: -o "process status -d" \
// RUN: -o "expr x.get()" \
// RUN: -o "process status -d" \
// RUN: -o "process status -d" \
// RUN: -o "expr x.i = 10" \
// RUN: -o "process status -d" \
// RUN: -o "process status -d" \
// RUN: -o "continue" \
// RUN: -o "process status -d" \
// RUN: -o "exit" | FileCheck %s -dump-input=fail
class X {
int i = 0;
public:
int get() { return i; }
};
int main() {
X x;
x.get();
__builtin_debugtrap();
__builtin_debugtrap();
return 0;
}
// CHECK-LABEL: process status -d
// CHECK: m_stop_id: [[#STOP_ID:]]
// CHECK: m_memory_id: [[#MEMORY_ID:]]
// CHECK-LABEL: expr x.i != 42
// IDs are not changed when executing simple expressions
// CHECK-LABEL: process status -d
// CHECK: m_stop_id: [[#STOP_ID]]
// CHECK: m_memory_id: [[#MEMORY_ID]]
// CHECK-LABEL: process status -d
// Remember new values
// CHECK: m_stop_id: [[#STOP_ID:]]
// CHECK: m_memory_id: [[#MEMORY_ID:]]
// CHECK-LABEL: expr x.get()
// Expression causes ID to be bumped because LLDB has to execute function and in doing
// so must write the return address to the stack.
// CHECK-LABEL: process status -d
// CHECK-NOT: m_stop_id: [[#STOP_ID]]
// CHECK-NOT: m_memory_id: [[#MEMORY_ID]]
// CHECK-LABEL: process status -d
// Remember new values
// CHECK: m_stop_id: [[#STOP_ID:]]
// CHECK: m_memory_id: [[#MEMORY_ID:]]
// CHECK-LABEL: expr x.i = 10
// Expression causes MemoryID to be bumped because LLDB writes to non-cache memory
// CHECK-LABEL: process status -d
// CHECK: m_stop_id: [[#STOP_ID]]
// CHECK-NOT: m_memory_id: [[#MEMORY_ID]]
// CHECK-LABEL: process status -d
// Remember new values
// CHECK: m_stop_id: [[#STOP_ID:]]
// CHECK: m_memory_id: [[#MEMORY_ID:]]
// CHECK-LABEL: continue
// Continue causes StopID to be bumped because process is resumed
// CHECK-LABEL: process status -d
// CHECK-NOT: m_stop_id: [[#STOP_ID]]
// CHECK: m_memory_id: [[#MEMORY_ID]]