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[JITLink] Expose x86-64 pointer jump stub block construction. 

This can be useful for clients who want to define their own symbol for the
stub, or re-use some existing symbol.
This commit is contained in:
Lang Hames 2021-05-12 20:56:07 -07:00
parent 4b0f5edd36
commit 2f21a272af
1 changed files with 16 additions and 6 deletions
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22
llvm/include/llvm/ExecutionEngine/JITLink/x86_64.h
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@ -369,20 +369,30 @@ inline Symbol &createAnonymousPointer(LinkGraph &G, Section &PointerSection,
return G.addAnonymousSymbol(B, 0, 8, false, false);
}
/// Create a jump stub that jumps via the pointer at the given symbol, returns
/// an anonymous symbol pointing to it.
/// Create a jump stub block that jumps via the pointer at the given symbol.
///
/// The stub block will have the following default values:
/// alignment: 8-bit
/// alignment-offset: 0
/// address: highest allowable: (~5U)
inline Symbol &createAnonymousPointerJumpStub(LinkGraph &G,
Section &StubSection,
Symbol &PointerSymbol) {
inline Block &createPointerJumpStubBlock(LinkGraph &G, Section &StubSection,
Symbol &PointerSymbol) {
auto &B =
G.createContentBlock(StubSection, PointerJumpStubContent, ~5ULL, 1, 0);
B.addEdge(Delta32, 2, PointerSymbol, -4);
return G.addAnonymousSymbol(B, 0, 6, true, false);
return B;
}
/// Create a jump stub that jumps via the pointer at the given symbol and
/// an anonymous symbol pointing to it. Return the anonymous symbol.
///
/// The stub block will be created by createPointerJumpStubBlock.
inline Symbol &createAnonymousPointerJumpStub(LinkGraph &G,
Section &StubSection,
Symbol &PointerSymbol) {
return G.addAnonymousSymbol(
createPointerJumpStubBlock(G, StubSection, PointerSymbol), 0, 6, true,
false);
}
} // namespace x86_64