Move the Function*->allocated blocks map from the JITMemoryManager to the

JITEmitter.

I'm gradually making Functions auto-remove themselves from the JIT when they're
destroyed. In this case, the Function needs to be removed from the JITEmitter,
but the map recording which Functions need to be removed lived behind the
JITMemoryManager interface, which made things difficult.

This patch replaces the deallocateMemForFunction(Function*) method with a pair
of methods deallocateFunctionBody(void *) and deallocateExceptionTable(void *)
corresponding to the two startFoo/endFoo pairs.

llvm-svn: 84651

1 files changed, 12 insertions, 32 deletions

diff --git a/llvm/lib/ExecutionEngine/JIT/JITMemoryManager.cpp b/llvm/lib/ExecutionEngine/JIT/JITMemoryManager.cpp
index 474843f0662..ea9d09fffc7 100644
--- a/llvm/lib/ExecutionEngine/JIT/JITMemoryManager.cpp
+++ b/llvm/lib/ExecutionEngine/JIT/JITMemoryManager.cpp
@@ -297,9 +297,6 @@ namespace {
 
     uint8_t *GOTBase;     // Target Specific reserved memory
     void *DlsymTable;     // Stub external symbol information
-
-    std::map<const Function*, MemoryRangeHeader*> FunctionBlocks;
-    std::map<const Function*, MemoryRangeHeader*> TableBlocks;
   public:
     DefaultJITMemoryManager();
     ~DefaultJITMemoryManager();
@@ -414,7 +411,6 @@ namespace {
              "Mismatched function start/end!");
 
       uintptr_t BlockSize = FunctionEnd - (uint8_t *)CurBlock;
-      FunctionBlocks[F] = CurBlock;
 
       // Release the memory at the end of this block that isn't needed.
       FreeMemoryList =CurBlock->TrimAllocationToSize(FreeMemoryList, BlockSize);
@@ -464,7 +460,6 @@ namespace {
              "Mismatched table start/end!");
       
       uintptr_t BlockSize = TableEnd - (uint8_t *)CurBlock;
-      TableBlocks[F] = CurBlock;
 
       // Release the memory at the end of this block that isn't needed.
       FreeMemoryList =CurBlock->TrimAllocationToSize(FreeMemoryList, BlockSize);
@@ -478,15 +473,9 @@ namespace {
       return DlsymTable;
     }
     
-    /// deallocateMemForFunction - Deallocate all memory for the specified
-    /// function body.
-    void deallocateMemForFunction(const Function *F) {
-      std::map<const Function*, MemoryRangeHeader*>::iterator
-        I = FunctionBlocks.find(F);
-      if (I == FunctionBlocks.end()) return;
-      
+    void deallocateBlock(void *Block) {
       // Find the block that is allocated for this function.
-      MemoryRangeHeader *MemRange = I->second;
+      MemoryRangeHeader *MemRange = static_cast<MemoryRangeHeader*>(Block) - 1;
       assert(MemRange->ThisAllocated && "Block isn't allocated!");
 
       // Fill the buffer with garbage!
@@ -496,27 +485,18 @@ namespace {
 
       // Free the memory.
       FreeMemoryList = MemRange->FreeBlock(FreeMemoryList);
-      
-      // Finally, remove this entry from FunctionBlocks.
-      FunctionBlocks.erase(I);
-      
-      I = TableBlocks.find(F);
-      if (I == TableBlocks.end()) return;
-      
-      // Find the block that is allocated for this function.
-      MemRange = I->second;
-      assert(MemRange->ThisAllocated && "Block isn't allocated!");
+    }
 
-      // Fill the buffer with garbage!
-      if (PoisonMemory) {
-        memset(MemRange+1, 0xCD, MemRange->BlockSize-sizeof(*MemRange));
-      }
+    /// deallocateFunctionBody - Deallocate all memory for the specified
+    /// function body.
+    void deallocateFunctionBody(void *Body) {
+      deallocateBlock(Body);
+    }
 
-      // Free the memory.
-      FreeMemoryList = MemRange->FreeBlock(FreeMemoryList);
-      
-      // Finally, remove this entry from TableBlocks.
-      TableBlocks.erase(I);
+    /// deallocateExceptionTable - Deallocate memory for the specified
+    /// exception table.
+    void deallocateExceptionTable(void *ET) {
+      deallocateBlock(ET);
     }
 
     /// setMemoryWritable - When code generation is in progress,