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[Orc] Tidy up the assembly for the x86-64 resolver block.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234138 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2015-04-06 03:01:29 +00:00
parent 5ede7d8209
commit d0440d2705
1 changed files with 45 additions and 44 deletions
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89
lib/ExecutionEngine/Orc/OrcTargetSupport.cpp
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@ -6,39 +6,6 @@ using namespace llvm::orc;
namespace {
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";
}
template <typename TargetT>
uint64_t executeCompileCallback(JITCompileCallbackManagerBase *JCBM,
TargetAddress CallbackID) {
return JCBM->executeCompileCallback(CallbackID);
@ -53,14 +20,26 @@ const char* OrcX86_64::ResolverBlockName = "orc_resolver_block";
void OrcX86_64::insertResolverBlock(
Module &M, JITCompileCallbackManagerBase &JCBM) {
// Trampoline code-sequence length, used to get trampoline address from return
// address.
const unsigned X86_64_TrampolineLength = 6;
auto CallbackPtr = executeCompileCallback<OrcX86_64>;
// List of x86-64 GPRs to save.
std::array<const char *, 11> GPRs = {{
"rbx", "r12", "r13", "r14", "r15", // Callee saved (rbp preserved below).
"rdi", "rsi", "rdx", "rcx", "r8", "r9", // Int args.
}};
// Address of the executeCompileCallback function.
uint64_t CallbackAddr =
static_cast<uint64_t>(reinterpret_cast<uintptr_t>(CallbackPtr));
static_cast<uint64_t>(
reinterpret_cast<uintptr_t>(executeCompileCallback));
std::ostringstream AsmStream;
Triple TT(M.getTargetTriple());
// Switch to text section.
if (TT.getOS() == Triple::Darwin)
AsmStream << ".section __TEXT,__text,regular,pure_instructions\n"
<< ".align 4, 0x90\n";
@ -68,24 +47,46 @@ void OrcX86_64::insertResolverBlock(
AsmStream << ".text\n"
<< ".align 16, 0x90\n";
// Bake in a pointer to the callback manager immediately before the
// start of the resolver function.
AsmStream << "jit_callback_manager_addr:\n"
<< " .quad " << &JCBM << "\n"
<< ResolverBlockName << ":\n";
<< " .quad " << &JCBM << "\n";
uint64_t ReturnAddrOffset = saveX86Regs(AsmStream);
// Start the resolver function.
AsmStream << ResolverBlockName << ":\n"
<< " pushq %rbp\n"
<< " movq %rsp, %rbp\n";
// Compute index, load object address, and call JIT.
AsmStream << " leaq jit_callback_manager_addr(%rip), %rdi\n"
// Store the GPRs.
for (const auto &GPR : GPRs)
AsmStream << " pushq %" << GPR << "\n";
// Store floating-point state with FXSAVE.
AsmStream << " subq $512, %rsp\n"
<< " fxsave (%rsp)\n"
// Load callback manager address, compute trampoline address, call JIT.
<< " lea jit_callback_manager_addr(%rip), %rdi\n"
<< " movq (%rdi), %rdi\n"
<< " movq " << ReturnAddrOffset << "(%rsp), %rsi\n"
<< " movq 0x8(%rbp), %rsi\n"
<< " subq $" << X86_64_TrampolineLength << ", %rsi\n"
<< " movabsq $" << CallbackAddr << ", %rax\n"
<< " callq *%rax\n"
<< " movq %rax, " << ReturnAddrOffset << "(%rsp)\n";
restoreX86Regs(AsmStream);
// Replace the return to the trampoline with the return address of the
// compiled function body.
<< " movq %rax, 0x8(%rbp)\n"
AsmStream << " retq\n";
// Restore the floating point state.
<< " fxrstor (%rsp)\n"
<< " addq $512, %rsp\n";
for (const auto &GPR : make_range(GPRs.rbegin(), GPRs.rend()))
AsmStream << " popq %" << GPR << "\n";
// Restore original RBP and return to compiled function body.
AsmStream << " popq %rbp\n"
<< " retq\n";
M.appendModuleInlineAsm(AsmStream.str());
}