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C++: remove some side-effect instructions
This leverages the existing alias analysis to identify functions which have no reads or writes of the AllAliasedMemory virtual variable, and therefore have no global side effects. A recursion over the call graph identifies functions which have no indirect global side effects, and calls to those functions have their global side effect instructions removed.
This commit is contained in:
Robert Marsh
@@ -11,8 +11,11 @@ private import NewIR
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private class OldBlock = Reachability::ReachableBlock;
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private class OldInstruction = Reachability::ReachableInstruction;
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private class OldInstruction extends Reachability::ReachableInstruction {
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OldInstruction() { not Elim::removeableSideEffect(this)}
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}
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private import SideEffectElimination as Elim
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import Cached
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cached
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@@ -58,7 +61,9 @@ private module Cached {
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cached
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predicate hasInstruction(TStageInstruction instr) {
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instr instanceof TRawInstruction and instr instanceof OldInstruction
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instr instanceof TRawInstruction and
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instr instanceof OldInstruction and
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not Elim::removeableSideEffect(instr)
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or
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instr = phiInstruction(_, _)
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or
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@@ -382,7 +387,14 @@ private module Cached {
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(
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if Reachability::isInfeasibleInstructionSuccessor(oldInstruction, kind)
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then result = unreachedInstruction(instruction.getEnclosingIRFunction())
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else result = getNewInstruction(oldInstruction.getSuccessor(kind))
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else
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if Elim::removeableSideEffect(oldInstruction.getSuccessor(kind))
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then
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// the only removed nodes are side-effect writes, but those may have Chi nodes
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// skip to the following instruction in the old IR, which won't be removed
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// if we start skipping specific side effects, this may no longer hold
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result = getNewInstruction(oldInstruction.getSuccessor(kind).getSuccessor(kind))
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else result = getNewInstruction(oldInstruction.getSuccessor(kind))
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)
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)
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or
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@@ -34,6 +34,7 @@ newtype TInstruction =
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AliasedSSA::SSA::hasPhiInstruction(blockStartInstr, memoryLocation)
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} or
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TAliasedSsaChiInstruction(TRawInstruction primaryInstruction) {
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not Elim::removeableSideEffect(primaryInstruction) and
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AliasedSSA::SSA::hasChiInstruction(primaryInstruction)
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} or
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TAliasedSsaUnreachedInstruction(IRFunctionBase irFunc) {
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@@ -2,3 +2,4 @@ import semmle.code.cpp.ir.internal.IRCppLanguage as Language
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import semmle.code.cpp.ir.implementation.raw.internal.IRConstruction as IRConstruction
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import semmle.code.cpp.ir.implementation.unaliased_ssa.internal.SSAConstruction as UnaliasedSsa
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import semmle.code.cpp.ir.implementation.aliased_ssa.internal.SSAConstruction as AliasedSSA
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import semmle.code.cpp.ir.implementation.aliased_ssa.internal.SideEffectElimination as Elim
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File diff suppressed because it is too large
Load Diff
@@ -1050,46 +1050,36 @@ ssa.cpp:
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# 240| r240_3(glval<unknown>) = FunctionAddress[Constructible] :
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# 240| r240_4(int) = Constant[1] :
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# 240| v240_5(void) = Call[Constructible] : func:r240_3, this:r240_1, 0:r240_4
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# 240| m240_6(unknown) = ^CallSideEffect : ~m239_4
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# 240| m240_7(unknown) = Chi : total:m239_4, partial:m240_6
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# 240| m240_8(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r240_1
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# 240| m240_9(Constructible) = Chi : total:m240_2, partial:m240_8
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# 240| m240_6(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r240_1
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# 240| m240_7(Constructible) = Chi : total:m240_2, partial:m240_6
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# 241| r241_1(glval<Constructible>) = VariableAddress[c] :
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# 241| r241_2(glval<unknown>) = FunctionAddress[g] :
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# 241| v241_3(void) = Call[g] : func:r241_2, this:r241_1
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# 241| m241_4(unknown) = ^CallSideEffect : ~m240_7
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# 241| m241_5(unknown) = Chi : total:m240_7, partial:m241_4
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# 241| v241_6(void) = ^IndirectReadSideEffect[-1] : &:r241_1, m240_9
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# 241| m241_7(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r241_1
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# 241| m241_8(Constructible) = Chi : total:m240_9, partial:m241_7
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# 241| v241_4(void) = ^IndirectReadSideEffect[-1] : &:r241_1, m240_7
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# 241| m241_5(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r241_1
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# 241| m241_6(Constructible) = Chi : total:m240_7, partial:m241_5
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# 242| r242_1(glval<Constructible>) = VariableAddress[c] :
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# 242| r242_2(glval<unknown>) = FunctionAddress[g] :
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# 242| v242_3(void) = Call[g] : func:r242_2, this:r242_1
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# 242| m242_4(unknown) = ^CallSideEffect : ~m241_5
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# 242| m242_5(unknown) = Chi : total:m241_5, partial:m242_4
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# 242| v242_6(void) = ^IndirectReadSideEffect[-1] : &:r242_1, m241_8
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# 242| m242_7(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r242_1
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# 242| m242_8(Constructible) = Chi : total:m241_8, partial:m242_7
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# 242| v242_4(void) = ^IndirectReadSideEffect[-1] : &:r242_1, m241_6
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# 242| m242_5(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r242_1
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# 242| m242_6(Constructible) = Chi : total:m241_6, partial:m242_5
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# 243| r243_1(glval<Constructible>) = VariableAddress[c2] :
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# 243| m243_2(Constructible) = Uninitialized[c2] : &:r243_1
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# 243| r243_3(glval<unknown>) = FunctionAddress[Constructible] :
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# 243| r243_4(int) = Constant[2] :
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# 243| v243_5(void) = Call[Constructible] : func:r243_3, this:r243_1, 0:r243_4
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# 243| m243_6(unknown) = ^CallSideEffect : ~m242_5
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# 243| m243_7(unknown) = Chi : total:m242_5, partial:m243_6
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# 243| m243_8(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r243_1
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# 243| m243_9(Constructible) = Chi : total:m243_2, partial:m243_8
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# 243| m243_6(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r243_1
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# 243| m243_7(Constructible) = Chi : total:m243_2, partial:m243_6
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# 244| r244_1(glval<Constructible>) = VariableAddress[c2] :
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# 244| r244_2(glval<unknown>) = FunctionAddress[g] :
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# 244| v244_3(void) = Call[g] : func:r244_2, this:r244_1
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# 244| m244_4(unknown) = ^CallSideEffect : ~m243_7
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# 244| m244_5(unknown) = Chi : total:m243_7, partial:m244_4
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# 244| v244_6(void) = ^IndirectReadSideEffect[-1] : &:r244_1, m243_9
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# 244| m244_7(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r244_1
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# 244| m244_8(Constructible) = Chi : total:m243_9, partial:m244_7
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# 244| v244_4(void) = ^IndirectReadSideEffect[-1] : &:r244_1, m243_7
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# 244| m244_5(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r244_1
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# 244| m244_6(Constructible) = Chi : total:m243_7, partial:m244_5
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# 245| v245_1(void) = NoOp :
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# 239| v239_5(void) = ReturnVoid :
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# 239| v239_6(void) = AliasedUse : ~m244_5
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# 239| v239_6(void) = AliasedUse : m239_3
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# 239| v239_7(void) = ExitFunction :
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# 247| char* VoidStarIndirectParameters(char*, int)
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@@ -1391,43 +1381,37 @@ ssa.cpp:
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# 294| r294_18(glval<int>) = VariableAddress[x] :
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# 294| r294_19(int) = Load[x] : &:r294_18, m291_6
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# 294| v294_20(void) = Call[A] : func:r294_17, this:r294_16, 0:r294_19
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# 294| m294_21(unknown) = ^CallSideEffect : ~m294_14
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# 294| m294_22(unknown) = Chi : total:m294_14, partial:m294_21
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# 294| m294_23(A) = ^IndirectMayWriteSideEffect[-1] : &:r294_16
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# 294| m294_24(unknown) = Chi : total:m294_15, partial:m294_23
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# 294| v294_25(void) = Call[A] : func:r294_9, this:r294_8, 0:r294_16
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# 294| m294_26(unknown) = ^CallSideEffect : ~m294_22
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# 294| m294_27(unknown) = Chi : total:m294_22, partial:m294_26
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# 294| v294_28(void) = ^BufferReadSideEffect[0] : &:r294_16, ~m294_24
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# 294| m294_29(A) = ^IndirectMayWriteSideEffect[-1] : &:r294_8
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# 294| m294_30(unknown) = Chi : total:m294_7, partial:m294_29
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# 294| m294_31(unknown) = ^BufferMayWriteSideEffect[0] : &:r294_16
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# 294| m294_32(unknown) = Chi : total:m294_24, partial:m294_31
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# 294| r294_33(glval<int>) = FieldAddress[i] : r294_8
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# 294| r294_34(int) = Load[?] : &:r294_33, ~m294_30
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# 294| m294_35(int) = Store[j] : &:r294_1, r294_34
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# 294| m294_21(A) = ^IndirectMayWriteSideEffect[-1] : &:r294_16
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# 294| m294_22(unknown) = Chi : total:m294_15, partial:m294_21
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# 294| v294_23(void) = Call[A] : func:r294_9, this:r294_8, 0:r294_16
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# 294| v294_24(void) = ^BufferReadSideEffect[0] : &:r294_16, ~m294_22
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# 294| m294_25(A) = ^IndirectMayWriteSideEffect[-1] : &:r294_8
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# 294| m294_26(unknown) = Chi : total:m294_7, partial:m294_25
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# 294| m294_27(unknown) = ^BufferMayWriteSideEffect[0] : &:r294_16
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# 294| m294_28(unknown) = Chi : total:m294_22, partial:m294_27
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# 294| r294_29(glval<int>) = FieldAddress[i] : r294_8
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# 294| r294_30(int) = Load[?] : &:r294_29, ~m294_26
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# 294| m294_31(int) = Store[j] : &:r294_1, r294_30
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# 295| r295_1(glval<A *>) = VariableAddress[a] :
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# 295| r295_2(glval<unknown>) = FunctionAddress[operator new] :
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# 295| r295_3(unsigned long) = Constant[4] :
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# 295| r295_4(void *) = Call[operator new] : func:r295_2, 0:r295_3
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# 295| m295_5(unknown) = ^CallSideEffect : ~m294_27
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# 295| m295_6(unknown) = Chi : total:m294_27, partial:m295_5
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# 295| m295_5(unknown) = ^CallSideEffect : ~m294_14
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# 295| m295_6(unknown) = Chi : total:m294_14, partial:m295_5
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# 295| m295_7(unknown) = ^InitializeDynamicAllocation : &:r295_4
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# 295| r295_8(A *) = Convert : r295_4
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# 295| r295_9(glval<unknown>) = FunctionAddress[A] :
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# 295| v295_10(void) = Call[A] : func:r295_9, this:r295_8
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# 295| m295_11(unknown) = ^CallSideEffect : ~m295_6
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# 295| m295_12(unknown) = Chi : total:m295_6, partial:m295_11
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# 295| m295_13(A) = ^IndirectMayWriteSideEffect[-1] : &:r295_8
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# 295| m295_14(unknown) = Chi : total:m295_7, partial:m295_13
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# 295| m295_15(A *) = Store[a] : &:r295_1, r295_8
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# 295| m295_11(A) = ^IndirectMayWriteSideEffect[-1] : &:r295_8
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# 295| m295_12(unknown) = Chi : total:m295_7, partial:m295_11
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# 295| m295_13(A *) = Store[a] : &:r295_1, r295_8
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# 296| r296_1(glval<Point *>) = VariableAddress[#return] :
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# 296| r296_2(glval<Point *>) = VariableAddress[p] :
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# 296| r296_3(Point *) = Load[p] : &:r296_2, m292_9
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# 296| m296_4(Point *) = Store[#return] : &:r296_1, r296_3
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# 291| r291_7(glval<Point *>) = VariableAddress[#return] :
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# 291| v291_8(void) = ReturnValue : &:r291_7, m296_4
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# 291| v291_9(void) = AliasedUse : ~m295_12
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# 291| v291_9(void) = AliasedUse : ~m295_6
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# 291| v291_10(void) = ExitFunction :
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# 301| int main(int, char**)
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@@ -1045,46 +1045,36 @@ ssa.cpp:
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# 240| r240_3(glval<unknown>) = FunctionAddress[Constructible] :
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# 240| r240_4(int) = Constant[1] :
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# 240| v240_5(void) = Call[Constructible] : func:r240_3, this:r240_1, 0:r240_4
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# 240| m240_6(unknown) = ^CallSideEffect : ~m239_4
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# 240| m240_7(unknown) = Chi : total:m239_4, partial:m240_6
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# 240| m240_8(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r240_1
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# 240| m240_9(Constructible) = Chi : total:m240_2, partial:m240_8
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# 240| m240_6(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r240_1
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# 240| m240_7(Constructible) = Chi : total:m240_2, partial:m240_6
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# 241| r241_1(glval<Constructible>) = VariableAddress[c] :
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# 241| r241_2(glval<unknown>) = FunctionAddress[g] :
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# 241| v241_3(void) = Call[g] : func:r241_2, this:r241_1
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# 241| m241_4(unknown) = ^CallSideEffect : ~m240_7
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# 241| m241_5(unknown) = Chi : total:m240_7, partial:m241_4
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# 241| v241_6(void) = ^IndirectReadSideEffect[-1] : &:r241_1, m240_9
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# 241| m241_7(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r241_1
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# 241| m241_8(Constructible) = Chi : total:m240_9, partial:m241_7
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# 241| v241_4(void) = ^IndirectReadSideEffect[-1] : &:r241_1, m240_7
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# 241| m241_5(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r241_1
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# 241| m241_6(Constructible) = Chi : total:m240_7, partial:m241_5
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# 242| r242_1(glval<Constructible>) = VariableAddress[c] :
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# 242| r242_2(glval<unknown>) = FunctionAddress[g] :
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# 242| v242_3(void) = Call[g] : func:r242_2, this:r242_1
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# 242| m242_4(unknown) = ^CallSideEffect : ~m241_5
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# 242| m242_5(unknown) = Chi : total:m241_5, partial:m242_4
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# 242| v242_6(void) = ^IndirectReadSideEffect[-1] : &:r242_1, m241_8
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# 242| m242_7(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r242_1
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# 242| m242_8(Constructible) = Chi : total:m241_8, partial:m242_7
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# 242| v242_4(void) = ^IndirectReadSideEffect[-1] : &:r242_1, m241_6
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# 242| m242_5(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r242_1
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# 242| m242_6(Constructible) = Chi : total:m241_6, partial:m242_5
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# 243| r243_1(glval<Constructible>) = VariableAddress[c2] :
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# 243| m243_2(Constructible) = Uninitialized[c2] : &:r243_1
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# 243| r243_3(glval<unknown>) = FunctionAddress[Constructible] :
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# 243| r243_4(int) = Constant[2] :
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# 243| v243_5(void) = Call[Constructible] : func:r243_3, this:r243_1, 0:r243_4
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# 243| m243_6(unknown) = ^CallSideEffect : ~m242_5
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# 243| m243_7(unknown) = Chi : total:m242_5, partial:m243_6
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# 243| m243_8(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r243_1
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# 243| m243_9(Constructible) = Chi : total:m243_2, partial:m243_8
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# 243| m243_6(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r243_1
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# 243| m243_7(Constructible) = Chi : total:m243_2, partial:m243_6
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# 244| r244_1(glval<Constructible>) = VariableAddress[c2] :
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# 244| r244_2(glval<unknown>) = FunctionAddress[g] :
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# 244| v244_3(void) = Call[g] : func:r244_2, this:r244_1
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# 244| m244_4(unknown) = ^CallSideEffect : ~m243_7
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# 244| m244_5(unknown) = Chi : total:m243_7, partial:m244_4
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# 244| v244_6(void) = ^IndirectReadSideEffect[-1] : &:r244_1, m243_9
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# 244| m244_7(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r244_1
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# 244| m244_8(Constructible) = Chi : total:m243_9, partial:m244_7
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# 244| v244_4(void) = ^IndirectReadSideEffect[-1] : &:r244_1, m243_7
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# 244| m244_5(Constructible) = ^IndirectMayWriteSideEffect[-1] : &:r244_1
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# 244| m244_6(Constructible) = Chi : total:m243_7, partial:m244_5
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# 245| v245_1(void) = NoOp :
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# 239| v239_5(void) = ReturnVoid :
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# 239| v239_6(void) = AliasedUse : ~m244_5
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# 239| v239_6(void) = AliasedUse : m239_3
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# 239| v239_7(void) = ExitFunction :
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# 247| char* VoidStarIndirectParameters(char*, int)
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@@ -1385,43 +1375,37 @@ ssa.cpp:
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# 294| r294_18(glval<int>) = VariableAddress[x] :
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# 294| r294_19(int) = Load[x] : &:r294_18, m291_6
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# 294| v294_20(void) = Call[A] : func:r294_17, this:r294_16, 0:r294_19
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# 294| m294_21(unknown) = ^CallSideEffect : ~m294_14
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# 294| m294_22(unknown) = Chi : total:m294_14, partial:m294_21
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# 294| m294_23(A) = ^IndirectMayWriteSideEffect[-1] : &:r294_16
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# 294| m294_24(unknown) = Chi : total:m294_15, partial:m294_23
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# 294| v294_25(void) = Call[A] : func:r294_9, this:r294_8, 0:r294_16
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# 294| m294_26(unknown) = ^CallSideEffect : ~m294_22
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# 294| m294_27(unknown) = Chi : total:m294_22, partial:m294_26
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# 294| v294_28(void) = ^BufferReadSideEffect[0] : &:r294_16, ~m294_24
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# 294| m294_29(A) = ^IndirectMayWriteSideEffect[-1] : &:r294_8
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# 294| m294_30(unknown) = Chi : total:m294_7, partial:m294_29
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# 294| m294_31(unknown) = ^BufferMayWriteSideEffect[0] : &:r294_16
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# 294| m294_32(unknown) = Chi : total:m294_24, partial:m294_31
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# 294| r294_33(glval<int>) = FieldAddress[i] : r294_8
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# 294| r294_34(int) = Load[?] : &:r294_33, ~m294_30
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# 294| m294_35(int) = Store[j] : &:r294_1, r294_34
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# 294| m294_21(A) = ^IndirectMayWriteSideEffect[-1] : &:r294_16
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# 294| m294_22(unknown) = Chi : total:m294_15, partial:m294_21
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# 294| v294_23(void) = Call[A] : func:r294_9, this:r294_8, 0:r294_16
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# 294| v294_24(void) = ^BufferReadSideEffect[0] : &:r294_16, ~m294_22
|
||||
# 294| m294_25(A) = ^IndirectMayWriteSideEffect[-1] : &:r294_8
|
||||
# 294| m294_26(unknown) = Chi : total:m294_7, partial:m294_25
|
||||
# 294| m294_27(unknown) = ^BufferMayWriteSideEffect[0] : &:r294_16
|
||||
# 294| m294_28(unknown) = Chi : total:m294_22, partial:m294_27
|
||||
# 294| r294_29(glval<int>) = FieldAddress[i] : r294_8
|
||||
# 294| r294_30(int) = Load[?] : &:r294_29, ~m294_26
|
||||
# 294| m294_31(int) = Store[j] : &:r294_1, r294_30
|
||||
# 295| r295_1(glval<A *>) = VariableAddress[a] :
|
||||
# 295| r295_2(glval<unknown>) = FunctionAddress[operator new] :
|
||||
# 295| r295_3(unsigned long) = Constant[4] :
|
||||
# 295| r295_4(void *) = Call[operator new] : func:r295_2, 0:r295_3
|
||||
# 295| m295_5(unknown) = ^CallSideEffect : ~m294_27
|
||||
# 295| m295_6(unknown) = Chi : total:m294_27, partial:m295_5
|
||||
# 295| m295_5(unknown) = ^CallSideEffect : ~m294_14
|
||||
# 295| m295_6(unknown) = Chi : total:m294_14, partial:m295_5
|
||||
# 295| m295_7(unknown) = ^InitializeDynamicAllocation : &:r295_4
|
||||
# 295| r295_8(A *) = Convert : r295_4
|
||||
# 295| r295_9(glval<unknown>) = FunctionAddress[A] :
|
||||
# 295| v295_10(void) = Call[A] : func:r295_9, this:r295_8
|
||||
# 295| m295_11(unknown) = ^CallSideEffect : ~m295_6
|
||||
# 295| m295_12(unknown) = Chi : total:m295_6, partial:m295_11
|
||||
# 295| m295_13(A) = ^IndirectMayWriteSideEffect[-1] : &:r295_8
|
||||
# 295| m295_14(unknown) = Chi : total:m295_7, partial:m295_13
|
||||
# 295| m295_15(A *) = Store[a] : &:r295_1, r295_8
|
||||
# 295| m295_11(A) = ^IndirectMayWriteSideEffect[-1] : &:r295_8
|
||||
# 295| m295_12(unknown) = Chi : total:m295_7, partial:m295_11
|
||||
# 295| m295_13(A *) = Store[a] : &:r295_1, r295_8
|
||||
# 296| r296_1(glval<Point *>) = VariableAddress[#return] :
|
||||
# 296| r296_2(glval<Point *>) = VariableAddress[p] :
|
||||
# 296| r296_3(Point *) = Load[p] : &:r296_2, m292_9
|
||||
# 296| m296_4(Point *) = Store[#return] : &:r296_1, r296_3
|
||||
# 291| r291_7(glval<Point *>) = VariableAddress[#return] :
|
||||
# 291| v291_8(void) = ReturnValue : &:r291_7, m296_4
|
||||
# 291| v291_9(void) = AliasedUse : ~m295_12
|
||||
# 291| v291_9(void) = AliasedUse : ~m295_6
|
||||
# 291| v291_10(void) = ExitFunction :
|
||||
|
||||
# 301| int main(int, char**)
|
||||
|
||||
Reference in New Issue
Block a user