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https://github.com/c64scene-ar/llvm-6502.git
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906f5fa5c8
* No more createX86Emitter() vs. createSparcEmitter() -- there can be only one * As a result, the memory management semantics must be handled according to platform -- the parameters to mmap() are particularly sensitive to the host architecture. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6527 91177308-0d34-0410-b5e6-96231b3b80d8
91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
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//
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// This file implements the top-level support for creating a Just-In-Time
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// compiler for the current architecture.
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//
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//===----------------------------------------------------------------------===//
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#include "VM.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachineImpls.h"
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#include "llvm/Module.h"
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#include "Support/CommandLine.h"
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namespace {
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cl::opt<std::string>
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Arch("march", cl::desc("Architecture: `x86' or `sparc'"), cl::Prefix,
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cl::value_desc("machine architecture"));
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static std::string DefaultArch =
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#if defined(i386) || defined(__i386__) || defined(__x86__)
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"x86";
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#elif defined(sparc) || defined(__sparc__) || defined(__sparcv9)
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"sparc";
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#else
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"";
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#endif
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}
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/// createJIT - Create an return a new JIT compiler if there is one available
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/// for the current target. Otherwise it returns null.
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///
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ExecutionEngine *ExecutionEngine::createJIT(Module *M, unsigned Config) {
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TargetMachine* (*TargetMachineAllocator)(unsigned) = 0;
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if (Arch == "")
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Arch = DefaultArch;
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// Allow a command-line switch to override what *should* be the default target
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// machine for this platform. This allows for debugging a Sparc JIT on X86 --
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// our X86 machines are much faster at recompiling LLVM and linking lli.
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if (Arch == "x86") {
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TargetMachineAllocator = allocateX86TargetMachine;
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} else if (Arch == "sparc") {
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TargetMachineAllocator = allocateSparcTargetMachine;
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}
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if (TargetMachineAllocator) {
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// Allocate a target...
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TargetMachine *Target = (*TargetMachineAllocator)(Config);
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assert(Target && "Could not allocate target machine!");
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// Create the virtual machine object...
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return new VM(M, Target);
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} else {
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return 0;
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}
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}
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VM::VM(Module *M, TargetMachine *tm) : ExecutionEngine(M), TM(*tm) {
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setTargetData(TM.getTargetData());
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// Initialize MCE
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MCE = createEmitter(*this);
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setupPassManager();
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emitGlobals();
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}
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int VM::run(const std::string &FnName, const std::vector<std::string> &Args) {
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Function *F = getModule().getNamedFunction(FnName);
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if (F == 0) {
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std::cerr << "Could not find function '" << FnName <<"' in module!\n";
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return 1;
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}
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int(*PF)(int, char**) = (int(*)(int, char**))getPointerToFunction(F);
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assert(PF != 0 && "Null pointer to function?");
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// Build an argv vector...
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char **Argv = (char**)CreateArgv(Args);
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// Call the main function...
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int Result = PF(Args.size(), Argv);
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// Run any atexit handlers now!
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runAtExitHandlers();
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return Result;
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}
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