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Remapper: remove debug info for IDs stripped in other passes

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If some DCE is performed such as removing dead functions, then even
if we are NOT stripping debug info, we still must remove the debug
opcodes that refer to the now-dead IDs.

Also, this adds a small change to perform no ID remapping if none
is requested, making spirv-remap properly be a no-op if no options
are given.
This commit is contained in:
steve-lunarg 2016-12-09 11:13:23 -07:00
parent 906cc21816
commit 297754cfe8
11 changed files with 246 additions and 219 deletions
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68
SPIRV/SPVRemapper.cpp
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@ -327,12 +327,10 @@ namespace spv {
bound(maxBound); // reset header ID bound to as big as it now needs to be
}
// Mark debug instructions for stripping
void spirvbin_t::stripDebug()
{
if ((options & STRIP) == 0)
return;
// build local Id and name maps
// Strip instructions in the stripOp set: debug info.
process(
[&](spv::Op opCode, unsigned start) {
// remember opcodes we want to strip later
@ -343,6 +341,32 @@ namespace spv {
op_fn_nop);
}
// Mark instructions that refer to now-removed IDs for stripping
void spirvbin_t::stripDeadRefs()
{
process(
[&](spv::Op opCode, unsigned start) {
// strip opcodes pointing to removed data
switch (opCode) {
case spv::OpName:
case spv::OpMemberName:
case spv::OpDecorate:
case spv::OpMemberDecorate:
if (idPosR.find(asId(start+1)) == idPosR.end())
stripInst(start);
break;
default:
break; // leave it alone
}
return true;
},
op_fn_nop);
strip();
}
// Update local maps of ID, type, etc positions
void spirvbin_t::buildLocalMaps()
{
msg(2, 2, std::string("build local maps: "));
@ -351,7 +375,6 @@ namespace spv {
idMapL.clear();
// preserve nameMap, so we don't clear that.
fnPos.clear();
fnPosDCE.clear();
fnCalls.clear();
typeConstPos.clear();
idPosR.clear();
@ -366,10 +389,6 @@ namespace spv {
// build local Id and name maps
process(
[&](spv::Op opCode, unsigned start) {
// remember opcodes we want to strip later
if ((options & STRIP) && isStripOp(opCode))
stripInst(start);
unsigned word = start+1;
spv::Id typeId = spv::NoResult;
@ -957,7 +976,6 @@ namespace spv {
if (call_it == fnCalls.end() || call_it->second == 0) {
changed = true;
stripRange.push_back(fn->second);
fnPosDCE.insert(*fn);
// decrease counts of called functions
process(
@ -1011,11 +1029,15 @@ namespace spv {
// Remove single-use function variables + associated decorations and names
process(
[&](spv::Op opCode, unsigned start) {
if ((opCode == spv::OpVariable && varUseCount[asId(start+2)] == 1) ||
(opCode == spv::OpDecorate && varUseCount[asId(start+1)] == 1) ||
(opCode == spv::OpName && varUseCount[asId(start+1)] == 1)) {
stripInst(start);
}
spv::Id id = spv::NoResult;
if (opCode == spv::OpVariable)
id = asId(start+2);
if (opCode == spv::OpDecorate || opCode == spv::OpName)
id = asId(start+1);
if (id != spv::NoResult && varUseCount[id] == 1)
stripInst(start);
return true;
},
op_fn_nop);
@ -1276,25 +1298,31 @@ namespace spv {
// Set up opcode tables from SpvDoc
spv::Parameterize();
validate(); // validate header
buildLocalMaps();
validate(); // validate header
buildLocalMaps(); // build ID maps
msg(3, 4, std::string("ID bound: ") + std::to_string(bound()));
if (options & STRIP) stripDebug();
strip(); // strip out data we decided to eliminate
if (options & OPT_LOADSTORE) optLoadStore();
if (options & OPT_FWD_LS) forwardLoadStores();
if (options & DCE_FUNCS) dceFuncs();
if (options & DCE_VARS) dceVars();
if (options & DCE_TYPES) dceTypes();
strip(); // strip out data we decided to eliminate
strip(); // strip out data we decided to eliminate
stripDeadRefs(); // remove references to things we DCEed
// after the last strip, we must clean any debug info referring to now-deleted data
if (options & MAP_TYPES) mapTypeConst();
if (options & MAP_NAMES) mapNames();
if (options & MAP_FUNCS) mapFnBodies();
mapRemainder(); // map any unmapped IDs
applyMap(); // Now remap each shader to the new IDs we've come up with
if (options & MAP_ALL) {
mapRemainder(); // map any unmapped IDs
applyMap(); // Now remap each shader to the new IDs we've come up with
}
}
// remap from a memory image