1 /*
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10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
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23 
24 
25 
26 package jdk.tools.jaotc;
27 
28 import jdk.tools.jaotc.binformat.BinaryContainer;
29 import jdk.tools.jaotc.binformat.Relocation.RelocType;
30 import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage;
31 
32 import jdk.vm.ci.code.site.Call;
33 
34 /**
35  * This is a foreign call site. This means either a call to the VM or a call to a Graal stub. If
36  * it's a call directly to the VM, mangle the name. The call should go through regular .plt used by
37  * the system loader, at least for now. If it's a call to a Graal stub, it should always be a direct
38  * call, since the Graal stubs are contained within the .so file.
39  */
40 final class ForeignCallSiteRelocationInfo extends CallSiteRelocationInfo {
41 
ForeignCallSiteRelocationInfo(Call call, HotSpotForeignCallLinkage callTarget)42     ForeignCallSiteRelocationInfo(Call call, HotSpotForeignCallLinkage callTarget) {
43         super(getTargetSymbol(call, callTarget), getRelocType(callTarget));
44     }
45 
getTargetSymbol(Call call, HotSpotForeignCallLinkage callTarget)46     private static String getTargetSymbol(Call call, HotSpotForeignCallLinkage callTarget) {
47         // If it specifies a foreign call linkage, find the symbol corresponding to the address in
48         // HotSpotVMConfig's fields.
49         final long foreignCallTargetAddress = callTarget.getAddress();
50 
51         // Get the C/C++ function name associated with the foreign call target address.
52         String functionName = DataBuilder.getVMFunctionNameForAddress(foreignCallTargetAddress);
53         if (functionName != null) {
54             // Use the known global AOT symbol associated with function name, if one exists
55             String aotSymbol = BinaryContainer.getAOTSymbolForVMFunctionName(functionName);
56             if (aotSymbol == null) {
57                 throw new InternalError("no global symbol found for: " + functionName);
58             }
59             return aotSymbol;
60         }
61 
62         // Is it a Graal stub we are calling?
63         if (callTarget.isCompiledStub()) {
64             assert call.direct : "Should always be a direct call to stubs";
65             return callTarget.getSymbol();
66         }
67 
68         throw new InternalError("no symbol found for: " + callTarget);
69     }
70 
getRelocType(HotSpotForeignCallLinkage callTarget)71     private static RelocType getRelocType(HotSpotForeignCallLinkage callTarget) {
72         return callTarget.isCompiledStub() ? RelocType.STUB_CALL_DIRECT : RelocType.FOREIGN_CALL_INDIRECT_GOT;
73     }
74 
75 }
76