X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FJITCodeEmitter.h;h=9a73214186989736a5c617c282aa6de89616d630;hb=a2cd42a0a7c46d158714c09047a77b7bc1cf9d69;hp=cb9a0a1fa9fc3672fc677a783ad1b3769f0c1bf3;hpb=489393d7b92107cc3de17d8dbe7dd11ab7395fdc;p=oota-llvm.git diff --git a/include/llvm/CodeGen/JITCodeEmitter.h b/include/llvm/CodeGen/JITCodeEmitter.h index cb9a0a1fa9f..9a732141869 100644 --- a/include/llvm/CodeGen/JITCodeEmitter.h +++ b/include/llvm/CodeGen/JITCodeEmitter.h @@ -17,12 +17,11 @@ #ifndef LLVM_CODEGEN_JITCODEEMITTER_H #define LLVM_CODEGEN_JITCODEEMITTER_H -#include -#include "llvm/Support/DataTypes.h" -#include "llvm/Support/Streams.h" +#include "llvm/ADT/DenseMap.h" #include "llvm/CodeGen/MachineCodeEmitter.h" - -using namespace std; +#include "llvm/Support/DataTypes.h" +#include "llvm/Support/MathExtras.h" +#include namespace llvm { @@ -35,9 +34,9 @@ class MachineRelocation; class Value; class GlobalValue; class Function; - + /// JITCodeEmitter - This class defines two sorts of methods: those for -/// emitting the actual bytes of machine code, and those for emitting auxillary +/// emitting the actual bytes of machine code, and those for emitting auxiliary /// structures, such as jump tables, relocations, etc. /// /// Emission of machine code is complicated by the fact that we don't (in @@ -52,6 +51,7 @@ class Function; /// occurred, more memory is allocated, and we reemit the code into it. /// class JITCodeEmitter : public MachineCodeEmitter { + virtual void anchor(); public: virtual ~JITCodeEmitter() {} @@ -68,23 +68,11 @@ public: /// virtual bool finishFunction(MachineFunction &F) = 0; - /// startGVStub - This callback is invoked when the JIT needs the - /// address of a GV (e.g. function) that has not been code generated yet. - /// The StubSize specifies the total size required by the stub. - /// - virtual void startGVStub(const GlobalValue* GV, unsigned StubSize, - unsigned Alignment = 1) = 0; - - /// startGVStub - This callback is invoked when the JIT needs the address of a - /// GV (e.g. function) that has not been code generated yet. Buffer points to - /// memory already allocated for this stub. - /// - virtual void startGVStub(const GlobalValue* GV, void *Buffer, - unsigned StubSize) = 0; - - /// finishGVStub - This callback is invoked to terminate a GV stub. - /// - virtual void *finishGVStub(const GlobalValue* F) = 0; + /// allocIndirectGV - Allocates and fills storage for an indirect + /// GlobalValue, and returns the address. + virtual void *allocIndirectGV(const GlobalValue *GV, + const uint8_t *Buffer, size_t Size, + unsigned Alignment) = 0; /// emitByte - This callback is invoked when a byte needs to be written to the /// output stream. @@ -158,31 +146,47 @@ public: } } - /// emitAlignment - Move the CurBufferPtr pointer up the the specified + /// emitAlignment - Move the CurBufferPtr pointer up to the specified /// alignment (saturated to BufferEnd of course). void emitAlignment(unsigned Alignment) { if (Alignment == 0) Alignment = 1; + uint8_t *NewPtr = (uint8_t*)RoundUpToAlignment((uintptr_t)CurBufferPtr, + Alignment); + CurBufferPtr = std::min(NewPtr, BufferEnd); + } - if(Alignment <= (uintptr_t)(BufferEnd-CurBufferPtr)) { - // Move the current buffer ptr up to the specified alignment. - CurBufferPtr = - (uint8_t*)(((uintptr_t)CurBufferPtr+Alignment-1) & - ~(uintptr_t)(Alignment-1)); - } else { + /// emitAlignmentWithFill - Similar to emitAlignment, except that the + /// extra bytes are filled with the provided byte. + void emitAlignmentWithFill(unsigned Alignment, uint8_t Fill) { + if (Alignment == 0) Alignment = 1; + uint8_t *NewPtr = (uint8_t*)RoundUpToAlignment((uintptr_t)CurBufferPtr, + Alignment); + // Fail if we don't have room. + if (NewPtr > BufferEnd) { CurBufferPtr = BufferEnd; + return; + } + while (CurBufferPtr < NewPtr) { + *CurBufferPtr++ = Fill; } } - /// emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be /// written to the output stream. - void emitULEB128Bytes(uint64_t Value) { + void emitULEB128Bytes(uint64_t Value, unsigned PadTo = 0) { do { uint8_t Byte = Value & 0x7f; Value >>= 7; - if (Value) Byte |= 0x80; + if (Value || PadTo != 0) Byte |= 0x80; emitByte(Byte); } while (Value); + + if (PadTo) { + do { + uint8_t Byte = (PadTo > 1) ? 0x80 : 0x0; + emitByte(Byte); + } while (--PadTo); + } } /// emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be @@ -203,8 +207,7 @@ public: /// emitString - This callback is invoked when a String needs to be /// written to the output stream. void emitString(const std::string &String) { - for (unsigned i = 0, N = static_cast(String.size()); - i < N; ++i) { + for (size_t i = 0, N = String.size(); i < N; ++i) { uint8_t C = String[i]; emitByte(C); } @@ -245,7 +248,7 @@ public: /// emitLabel - Emits a label - virtual void emitLabel(uint64_t LabelID) = 0; + virtual void emitLabel(MCSymbol *Label) = 0; /// allocateSpace - Allocate a block of space in the current output buffer, /// returning null (and setting conditions to indicate buffer overflow) on @@ -290,6 +293,13 @@ public: return CurBufferPtr-BufferBegin; } + /// earlyResolveAddresses - True if the code emitter can use symbol addresses + /// during code emission time. The JIT is capable of doing this because it + /// creates jump tables or constant pools in memory on the fly while the + /// object code emitters rely on a linker to have real addresses and should + /// use relocations instead. + bool earlyResolveAddresses() const { return true; } + /// addRelocation - Whenever a relocatable address is needed, it should be /// noted with this interface. virtual void addRelocation(const MachineRelocation &MR) = 0; @@ -312,14 +322,18 @@ public: /// virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0; - /// getLabelAddress - Return the address of the specified LabelID, only usable - /// after the LabelID has been emitted. + /// getLabelAddress - Return the address of the specified Label, only usable + /// after the Label has been emitted. /// - virtual uintptr_t getLabelAddress(uint64_t LabelID) const = 0; + virtual uintptr_t getLabelAddress(MCSymbol *Label) const = 0; /// Specifies the MachineModuleInfo object. This is used for exception handling /// purposes. virtual void setModuleInfo(MachineModuleInfo* Info) = 0; + + /// getLabelLocations - Return the label locations map of the label IDs to + /// their address. + virtual DenseMap *getLabelLocations() { return 0; } }; } // End llvm namespace