llvm-6502/lib/ExecutionEngine/Orc/OrcTargetSupport.cpp

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#include "llvm/ADT/Triple.h"
#include "llvm/ExecutionEngine/Orc/IndirectionUtils.h"
#include <array>
using namespace llvm;
namespace {
const char *JITCallbackFuncName = "call_jit_for_lazy_compile";
const char *JITCallbackIndexLabelPrefix = "jit_resolve_";
std::array<const char *, 12> X86GPRsToSave = {{
"rbp", "rbx", "r12", "r13", "r14", "r15", // Callee saved.
"rdi", "rsi", "rdx", "rcx", "r8", "r9", // Int args.
}};
std::array<const char *, 8> X86XMMsToSave = {{
"xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7" // FP args
}};
template <typename OStream> unsigned saveX86Regs(OStream &OS) {
for (const auto &GPR : X86GPRsToSave)
OS << " pushq %" << GPR << "\n";
OS << " subq $" << (16 * X86XMMsToSave.size()) << ", %rsp\n";
for (unsigned i = 0; i < X86XMMsToSave.size(); ++i)
OS << " movdqu %" << X86XMMsToSave[i] << ", "
<< (16 * (X86XMMsToSave.size() - i - 1)) << "(%rsp)\n";
return (8 * X86GPRsToSave.size()) + (16 * X86XMMsToSave.size());
}
template <typename OStream> void restoreX86Regs(OStream &OS) {
for (unsigned i = 0; i < X86XMMsToSave.size(); ++i)
OS << " movdqu " << (16 * i) << "(%rsp), %"
<< X86XMMsToSave[(X86XMMsToSave.size() - i - 1)] << "\n";
OS << " addq $" << (16 * X86XMMsToSave.size()) << ", %rsp\n";
for (unsigned i = 0; i < X86GPRsToSave.size(); ++i)
OS << " popq %" << X86GPRsToSave[X86GPRsToSave.size() - i - 1] << "\n";
}
uint64_t call_jit_for_fn(JITResolveCallbackHandler *J, uint64_t FuncIdx) {
return J->resolve(FuncIdx);
}
}
namespace llvm {
std::string getJITResolveCallbackIndexLabel(unsigned I) {
std::ostringstream LabelStream;
LabelStream << JITCallbackIndexLabelPrefix << I;
return LabelStream.str();
}
void insertX86CallbackAsm(Module &M, JITResolveCallbackHandler &J) {
uint64_t CallbackAddr =
static_cast<uint64_t>(reinterpret_cast<uintptr_t>(call_jit_for_fn));
std::ostringstream JITCallbackAsm;
Triple TT(M.getTargetTriple());
if (TT.getOS() == Triple::Darwin)
JITCallbackAsm << ".section __TEXT,__text,regular,pure_instructions\n"
<< ".align 4, 0x90\n";
else
JITCallbackAsm << ".text\n"
<< ".align 16, 0x90\n";
JITCallbackAsm << "jit_object_addr:\n"
<< " .quad " << &J << "\n" << JITCallbackFuncName << ":\n";
uint64_t ReturnAddrOffset = saveX86Regs(JITCallbackAsm);
// Compute index, load object address, and call JIT.
JITCallbackAsm << " movq " << ReturnAddrOffset << "(%rsp), %rax\n"
<< " leaq (jit_indices_start+5)(%rip), %rbx\n"
<< " subq %rbx, %rax\n"
<< " xorq %rdx, %rdx\n"
<< " movq $5, %rbx\n"
<< " divq %rbx\n"
<< " movq %rax, %rsi\n"
<< " leaq jit_object_addr(%rip), %rdi\n"
<< " movq (%rdi), %rdi\n"
<< " movabsq $" << CallbackAddr << ", %rax\n"
<< " callq *%rax\n"
<< " movq %rax, " << ReturnAddrOffset << "(%rsp)\n";
restoreX86Regs(JITCallbackAsm);
JITCallbackAsm << " retq\n"
<< "jit_indices_start:\n";
for (JITResolveCallbackHandler::StubIndex I = 0; I < J.getNumFuncs(); ++I)
JITCallbackAsm << getJITResolveCallbackIndexLabel(I) << ":\n"
<< " callq " << JITCallbackFuncName << "\n";
M.appendModuleInlineAsm(JITCallbackAsm.str());
}
}