[PATCH] D97873: [Attributor] Enable heap-to-stack of any size
William Moses via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Mar 3 10:07:02 PST 2021
wsmoses created this revision.
wsmoses added a reviewer: jdoerfert.
Herald added subscribers: okura, kuter, uenoku, hiraditya.
Herald added a reviewer: uenoku.
Herald added a reviewer: homerdin.
wsmoses requested review of this revision.
Herald added a reviewer: sstefan1.
Herald added a reviewer: baziotis.
Herald added subscribers: llvm-commits, bbn.
Herald added a project: LLVM.
Enable Attributor's heap-to-stack to lower unbounded allocations given a max size of -1
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D97873
Files:
llvm/lib/Transforms/IPO/AttributorAttributes.cpp
llvm/test/Transforms/Attributor/lowerheap.ll
Index: llvm/test/Transforms/Attributor/lowerheap.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/Attributor/lowerheap.ll
@@ -0,0 +1,35 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes
+; RUN: opt -max-heap-to-stack-size=-1 -attributor -enable-new-pm=0 -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=1 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_NPM,NOT_CGSCC_OPM,NOT_TUNIT_NPM,IS__TUNIT____,IS________OPM,IS__TUNIT_OPM
+; RUN: opt -max-heap-to-stack-size=-1 -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=1 -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_CGSCC_OPM,NOT_CGSCC_NPM,NOT_TUNIT_OPM,IS__TUNIT____,IS________NPM,IS__TUNIT_NPM
+; RUN: opt -max-heap-to-stack-size=-1 -attributor-cgscc -enable-new-pm=0 -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_NPM,IS__CGSCC____,IS________OPM,IS__CGSCC_OPM
+; RUN: opt -max-heap-to-stack-size=-1 -aa-pipeline=basic-aa -passes=attributor-cgscc -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,NOT_TUNIT_NPM,NOT_TUNIT_OPM,NOT_CGSCC_OPM,IS__CGSCC____,IS________NPM,IS__CGSCC_NPM
+
+declare i64 @subfn(i8*) #0
+
+declare noalias i8* @malloc(i64)
+declare void @free(i8*)
+
+define i64 @f(i64 %len) {
+; IS________OPM-LABEL: define {{[^@]+}}@f
+; IS________OPM-SAME: (i64 [[LEN:%.*]]) {
+; IS________OPM-NEXT: entry:
+; IS________OPM-NEXT: [[MEM:%.*]] = call noalias i8* @malloc(i64 [[LEN]])
+; IS________OPM-NEXT: [[RES:%.*]] = call i64 @subfn(i8* [[MEM]]) [[ATTR1:#.*]]
+; IS________OPM-NEXT: call void @free(i8* [[MEM]])
+; IS________OPM-NEXT: ret i64 [[RES]]
+;
+; IS________NPM-LABEL: define {{[^@]+}}@f
+; IS________NPM-SAME: (i64 [[LEN:%.*]]) {
+; IS________NPM-NEXT: entry:
+; IS________NPM-NEXT: [[TMP0:%.*]] = alloca i8, i64 [[LEN]], align 1
+; IS________NPM-NEXT: [[RES:%.*]] = call i64 @subfn(i8* [[TMP0]]) [[ATTR1:#.*]]
+; IS________NPM-NEXT: ret i64 [[RES]]
+;
+entry:
+ %mem = call i8* @malloc(i64 %len)
+ %res = call i64 @subfn(i8* %mem)
+ call void @free(i8* %mem)
+ ret i64 %res
+}
+
+attributes #0 = { nounwind willreturn }
Index: llvm/lib/Transforms/IPO/AttributorAttributes.cpp
===================================================================
--- llvm/lib/Transforms/IPO/AttributorAttributes.cpp
+++ llvm/lib/Transforms/IPO/AttributorAttributes.cpp
@@ -5153,6 +5153,12 @@
}
if (IsMalloc) {
+ if (MaxHeapToStackSize == -1) {
+ if (UsesCheck(I) || FreeCheck(I)) {
+ MallocCalls.insert(&I);
+ return true;
+ }
+ }
if (auto *Size = dyn_cast<ConstantInt>(I.getOperand(0)))
if (Size->getValue().ule(MaxHeapToStackSize))
if (UsesCheck(I) || FreeCheck(I)) {
@@ -5160,6 +5166,12 @@
return true;
}
} else if (IsAlignedAllocLike && isa<ConstantInt>(I.getOperand(0))) {
+ if (MaxHeapToStackSize == -1) {
+ if (UsesCheck(I) || FreeCheck(I)) {
+ MallocCalls.insert(&I);
+ return true;
+ }
+ }
// Only if the alignment and sizes are constant.
if (auto *Size = dyn_cast<ConstantInt>(I.getOperand(1)))
if (Size->getValue().ule(MaxHeapToStackSize))
@@ -5168,6 +5180,12 @@
return true;
}
} else if (IsCalloc) {
+ if (MaxHeapToStackSize == -1) {
+ if (UsesCheck(I) || FreeCheck(I)) {
+ MallocCalls.insert(&I);
+ return true;
+ }
+ }
bool Overflow = false;
if (auto *Num = dyn_cast<ConstantInt>(I.getOperand(0)))
if (auto *Size = dyn_cast<ConstantInt>(I.getOperand(1)))
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