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Several related changes:

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1. Change several methods in the MachineCodeEmitter class to be pure virtual.
2. Suck emitConstantPool/initJumpTableInfo into startFunction, removing them
   from the MachineCodeEmitter interface, and reducing the amount of target-
   specific code.
3. Change the JITEmitter so that it allocates constantpools and jump tables
   *right* next to the functions that they belong to, instead of in a separate
   pool of memory.  This makes all memory for a function be contiguous, and
   means the JITEmitter only tracks one block of memory now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28065 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-05-02 23:22:24 +00:00
parent 1f4549f35c
commit f75f9be3fb
6 changed files with 34 additions and 63 deletions
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20
include/llvm/CodeGen/MachineCodeEmitter.h
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@@ -65,31 +65,21 @@ public:
/// about to be code generated. This initializes the BufferBegin/End/Ptr
/// fields.
///
virtual void startFunction(MachineFunction &F) {}
virtual void startFunction(MachineFunction &F) = 0;
/// finishFunction - This callback is invoked when the specified function has
/// finished code generation. If a buffer overflow has occurred, this method
/// returns true (the callee is required to try again), otherwise it returns
/// false.
///
virtual bool finishFunction(MachineFunction &F) {
return CurBufferPtr == BufferEnd;
}
/// emitConstantPool - This callback is invoked to output the constant pool
/// for the function.
virtual void emitConstantPool(MachineConstantPool *MCP) {}
/// initJumpTableInfo - This callback is invoked by the JIT to allocate the
/// necessary memory to hold the jump tables.
virtual void initJumpTableInfo(MachineJumpTableInfo *MJTI) {}
virtual bool finishFunction(MachineFunction &F) = 0;
/// emitJumpTableInfo - This callback is invoked to output the jump tables
/// for the function. In addition to a pointer to the MachineJumpTableInfo,
/// this function also takes a map of MBBs to addresses, so that the final
/// addresses of the MBBs can be written to the jump tables.
virtual void emitJumpTableInfo(MachineJumpTableInfo *MJTI,
std::map<MachineBasicBlock*,uint64_t> &MBBM) {}
std::map<MachineBasicBlock*,uint64_t> &MBBM) = 0;
/// startFunctionStub - This callback is invoked when the JIT needs the
/// address of a function that has not been code generated yet. The StubSize
@@ -97,12 +87,12 @@ public:
/// have constant pools, the can only use the other emitByte*/emitWord*
/// methods.
///
virtual void startFunctionStub(unsigned StubSize) {}
virtual void startFunctionStub(unsigned StubSize) = 0;
/// finishFunctionStub - This callback is invoked to terminate a function
/// stub.
///
virtual void *finishFunctionStub(const Function *F) { return 0; }
virtual void *finishFunctionStub(const Function *F) = 0;
/// emitByte - This callback is invoked when a byte needs to be written to the
/// output stream.