================
@@ -768,3 +768,63 @@ TEST(DWARFExpression, ExtensionsDWO) {
testExpressionVendorExtensions(dwo_module_sp, *dwo_dwarf_unit);
}
+
+TEST_F(DWARFExpressionMockProcessTest, DW_OP_piece_file_addr) {
+ struct MockTarget : Target {
+ MockTarget(Debugger &debugger, const ArchSpec &target_arch,
+ const lldb::PlatformSP &platform_sp)
+ : Target(debugger, target_arch, platform_sp, true) {}
+
+ size_t ReadMemory(const Address &addr, void *dst, size_t dst_len,
+ Status &error, bool force_live_memory = false,
+ lldb::addr_t *load_addr_ptr = nullptr) override {
+ // We expected to be called in a very specific way.
+ assert(dst_len == 1);
+ assert(addr.GetOffset() == 0x40 || addr.GetOffset() == 0x50);
+
+ if (addr.GetOffset() == 0x40)
+ ((uint8_t *)dst)[0] = 0x11;
+
+ if (addr.GetOffset() == 0x50)
+ ((uint8_t *)dst)[0] = 0x22;
+
+ return 1;
+ }
+ };
+
+ // Set up a mock process.
+ ArchSpec arch("i386-pc-linux");
+ Platform::SetHostPlatform(
+ platform_linux::PlatformLinux::CreateInstance(true, &arch));
+ lldb::DebuggerSP debugger_sp = Debugger::CreateInstance();
+ ASSERT_TRUE(debugger_sp);
+ lldb::PlatformSP platform_sp;
+ lldb::TargetSP target_sp =
+ std::make_shared<MockTarget>(*debugger_sp, arch, platform_sp);
+ ASSERT_TRUE(target_sp);
+ ASSERT_TRUE(target_sp->GetArchitecture().IsValid());
+
+ ExecutionContext exe_ctx(target_sp, false);
+
+ uint8_t expr[] = {DW_OP_addr, 0x40, 0x0, 0x0, 0x0, DW_OP_piece, 1,
+ DW_OP_addr, 0x50, 0x0, 0x0, 0x0, DW_OP_piece, 1};
+ DataExtractor extractor(expr, sizeof(expr), lldb::eByteOrderLittle,
+ /*addr_size*/ 4);
+ Value result;
+ Status status;
+ ASSERT_TRUE(DWARFExpression::Evaluate(
+ &exe_ctx, /*reg_ctx*/ nullptr, /*module_sp*/ {}, extractor,
+ /*unit*/ nullptr, lldb::eRegisterKindLLDB,
+ /*initial_value_ptr*/ nullptr,
+ /*object_address_ptr*/ nullptr, result, &status))
+ << status.ToError();
+
+ ASSERT_EQ(result.GetValueType(), Value::ValueType::HostAddress);
----------------
JDevlieghere wrote:
I can see how this is confusing. This is the **result** of the expression,
which we read in pieces, and because it's non-contiguous, necessarily need to
store in host memory. It's unrelated to the Value representing the `DW_OP_addr`
on the stack in the DWARF expression.
https://github.com/llvm/llvm-project/pull/94026
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