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Add special case bitcode support for DebugLoc. This avoids

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having the bitcode writer materialize mdnodes for all the
debug location tuples when writing out the bc file and 
stores the information in a more compact form.  For example,
the -O0 -g bc file for combine.c in 176.gcc shrinks from
739392 to 512096 bytes.

This concludes my planned short-term debug info work.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100261 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-04-03 02:17:50 +00:00
parent cbf1aa9e31
commit a6245247e9
5 changed files with 91 additions and 13 deletions
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44
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -1644,6 +1644,8 @@ bool BitcodeReader::ParseFunctionBody(Function *F) {
BasicBlock *CurBB = 0;
unsigned CurBBNo = 0;
DebugLoc LastLoc;
// Read all the records.
SmallVector<uint64_t, 64> Record;
while (1) {
@ -1699,6 +1701,46 @@ bool BitcodeReader::ParseFunctionBody(Function *F) {
CurBB = FunctionBBs[0];
continue;
case bitc::FUNC_CODE_DEBUG_LOC_AGAIN: // DEBUG_LOC_AGAIN
// This record indicates that the last instruction is at the same
// location as the previous instruction with a location.
I = 0;
// Get the last instruction emitted.
if (CurBB && !CurBB->empty())
I = &CurBB->back();
else if (CurBBNo && FunctionBBs[CurBBNo-1] &&
!FunctionBBs[CurBBNo-1]->empty())
I = &FunctionBBs[CurBBNo-1]->back();
if (I == 0) return Error("Invalid DEBUG_LOC_AGAIN record");
I->setDebugLoc(LastLoc);
I = 0;
continue;
case bitc::FUNC_CODE_DEBUG_LOC: { // DEBUG_LOC: [line, col, scope, ia]
I = 0; // Get the last instruction emitted.
if (CurBB && !CurBB->empty())
I = &CurBB->back();
else if (CurBBNo && FunctionBBs[CurBBNo-1] &&
!FunctionBBs[CurBBNo-1]->empty())
I = &FunctionBBs[CurBBNo-1]->back();
if (I == 0 || Record.size() < 4)
return Error("Invalid FUNC_CODE_DEBUG_LOC record");
unsigned Line = Record[0], Col = Record[1];
unsigned ScopeID = Record[2], IAID = Record[3];
MDNode *Scope = 0, *IA = 0;
if (ScopeID) Scope = cast<MDNode>(MDValueList.getValueFwdRef(ScopeID-1));
if (IAID) IA = cast<MDNode>(MDValueList.getValueFwdRef(IAID-1));
LastLoc = DebugLoc::get(Line, Col, Scope, IA);
I->setDebugLoc(LastLoc);
I = 0;
continue;
}
case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode]
unsigned OpNum = 0;
Value *LHS, *RHS;
@ -2285,8 +2327,6 @@ bool BitcodeReader::ParseFunctionBody(Function *F) {
// See if anything took the address of blocks in this function. If so,
// resolve them now.
/// BlockAddrFwdRefs - These are blockaddr references to basic blocks. These
/// are resolved lazily when functions are loaded.
DenseMap<Function*, std::vector<BlockAddrRefTy> >::iterator BAFRI =
BlockAddrFwdRefs.find(F);
if (BAFRI != BlockAddrFwdRefs.end()) {