1 #include "llvm/ADT/Triple.h"
2 #include "llvm/ExecutionEngine/Orc/IndirectionUtils.h"
9 const char *JITCallbackFuncName = "call_jit_for_lazy_compile";
10 const char *JITCallbackIndexLabelPrefix = "jit_resolve_";
12 std::array<const char *, 12> X86GPRsToSave = {{
13 "rbp", "rbx", "r12", "r13", "r14", "r15", // Callee saved.
14 "rdi", "rsi", "rdx", "rcx", "r8", "r9", // Int args.
17 std::array<const char *, 8> X86XMMsToSave = {{
18 "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7" // FP args
21 template <typename OStream> unsigned saveX86Regs(OStream &OS) {
22 for (const auto &GPR : X86GPRsToSave)
23 OS << " pushq %" << GPR << "\n";
25 OS << " subq $" << (16 * X86XMMsToSave.size()) << ", %rsp\n";
27 for (unsigned i = 0; i < X86XMMsToSave.size(); ++i)
28 OS << " movdqu %" << X86XMMsToSave[i] << ", "
29 << (16 * (X86XMMsToSave.size() - i - 1)) << "(%rsp)\n";
31 return (8 * X86GPRsToSave.size()) + (16 * X86XMMsToSave.size());
34 template <typename OStream> void restoreX86Regs(OStream &OS) {
35 for (unsigned i = 0; i < X86XMMsToSave.size(); ++i)
36 OS << " movdqu " << (16 * i) << "(%rsp), %"
37 << X86XMMsToSave[(X86XMMsToSave.size() - i - 1)] << "\n";
38 OS << " addq $" << (16 * X86XMMsToSave.size()) << ", %rsp\n";
40 for (unsigned i = 0; i < X86GPRsToSave.size(); ++i)
41 OS << " popq %" << X86GPRsToSave[X86GPRsToSave.size() - i - 1] << "\n";
44 uint64_t call_jit_for_fn(JITResolveCallbackHandler *J, uint64_t FuncIdx) {
45 return J->resolve(FuncIdx);
51 std::string getJITResolveCallbackIndexLabel(unsigned I) {
52 std::ostringstream LabelStream;
53 LabelStream << JITCallbackIndexLabelPrefix << I;
54 return LabelStream.str();
57 void insertX86CallbackAsm(Module &M, JITResolveCallbackHandler &J) {
58 uint64_t CallbackAddr =
59 static_cast<uint64_t>(reinterpret_cast<uintptr_t>(call_jit_for_fn));
61 std::ostringstream JITCallbackAsm;
62 Triple TT(M.getTargetTriple());
64 if (TT.getOS() == Triple::Darwin)
65 JITCallbackAsm << ".section __TEXT,__text,regular,pure_instructions\n"
66 << ".align 4, 0x90\n";
68 JITCallbackAsm << ".text\n"
69 << ".align 16, 0x90\n";
71 JITCallbackAsm << "jit_object_addr:\n"
72 << " .quad " << &J << "\n" << JITCallbackFuncName << ":\n";
74 uint64_t ReturnAddrOffset = saveX86Regs(JITCallbackAsm);
76 // Compute index, load object address, and call JIT.
77 JITCallbackAsm << " movq " << ReturnAddrOffset << "(%rsp), %rax\n"
78 << " leaq (jit_indices_start+5)(%rip), %rbx\n"
79 << " subq %rbx, %rax\n"
80 << " xorq %rdx, %rdx\n"
83 << " movq %rax, %rsi\n"
84 << " leaq jit_object_addr(%rip), %rdi\n"
85 << " movq (%rdi), %rdi\n"
86 << " movabsq $" << CallbackAddr << ", %rax\n"
88 << " movq %rax, " << ReturnAddrOffset << "(%rsp)\n";
90 restoreX86Regs(JITCallbackAsm);
92 JITCallbackAsm << " retq\n"
93 << "jit_indices_start:\n";
95 for (JITResolveCallbackHandler::StubIndex I = 0; I < J.getNumFuncs(); ++I)
96 JITCallbackAsm << getJITResolveCallbackIndexLabel(I) << ":\n"
97 << " callq " << JITCallbackFuncName << "\n";
99 M.appendModuleInlineAsm(JITCallbackAsm.str());