[CIR][CIRGen] Improve switch support for unrecheable code #528

wenpen · 2024-04-01T13:52:56Z

Support non-block case and statementw that don't belong to any case region, fix #520 #521

This reverts commit 55c03f8

…m#357) This PR fixes lowering of the next code: ``` void foo(int x, int y) { switch (x) { case 0: if (y) break; break; } } ``` i.e. when some sub statement contains `break` as well. Previously, we did this trick for `loop`: process nested `break`/`continue` statements while `LoopOp` lowering if they don't belong to another `LoopOp` or `SwitchOp`. This is why there is some refactoring here as well, but the idea is stiil the same: we need to process nested operations and emit branches to the proper blocks. This is quite frequent bug in `llvm-test-suite`

This is how both libc++ and libstdc++ implement iterator in std::array, stick to those use cases for now. We could add other variations in the future if there are others around.

- Check whether container is part of std, add a fixed list of available containers (for now only std::array) - Add a getRawDecl method to ASTRecordDeclInterface - Testcases

This was a bit half backed, give it some love.

Inspired by similar work in libc++, pointed to me by Louis Dionne and Nikolas Klauser. This is initial, very conservative and not generalized yet: works for `char`s within a specific version of `std::find`.

…ents. Before this fix conversion of flat offset to GlobalView indices could crash or compute invalid result.

This reverts commit bbaa147.

`ScopeOp` may end with `ReturnOp` instead of `YieldOp`, that is not expected now. This PR fix this. The reduced example is: ``` int foo() { { return 0; } } ``` This is quite frequent bug in `llvm-test-suite`

One more step towards variable length array support. This PR adds one more helper for the `alloca` instruction and re-use the existing ones. The reason is the following: right now there are two possible ways to insert alloca: either to a function entry block or to the given block after all the existing alloca instructions. But for VLA support we need to insert alloca anywhere, right after an array's size becomes known. Thus, we add one more parameter with the default value - insertion point. Also, we don't want copy-paste the code, and reuse the existing helpers, but it may be a little bit confusing to read.

This PR adds `cir.ternary` lowering. There are two approaches to lower `cir.ternary` imo: 1. Use `scf.if` op. 2. Use `cf.cond_br` op. I choose `scf.if` because `scf.if` + canonicalization produces `arith.select` whereas `cf.cond_br` requires scf lifting. In many ways `scf.if` is more high-level and closer to `cir.ternary`. A separate `cir.yield` lowering is required since we cannot directly replace `cir.yield` in the ternary op lowering -- the yield operands may still be illegal and doing so produces `builtin.unrealized_cast` ops. I couldn't figured out a way to solve this issue without adding a separate lowering pattern. Please let me know if you know a way to solve this issue.

This PR fixes the next case ``` typedef struct { } A; A create() { A a; return a; } void foo() { A a; a = create(); } ``` i.e. when a struct is assigned to a function call result

@gitoleg

…vmgh-352) (llvm#363) The error manifested in code like ``` int a[16]; int *const p = a; void foo() { p[0]; } ``` It's one the most frequent errors in current llvm-test-suite. I've added the test to globals.cir which is currently XFAILed, I think @gitoleg will fix it soon. Co-authored-by: Bruno Cardoso Lopes <[email protected]>

This PR addresses llvm#248 . Currently string literals are always lowered to a `cir.const_array` attribute even if the string literal only contains null bytes. This patch make the CodeGen emits `cir.zero` for these string literals.

Currently, codegen of lvalue comma expression would crash: ```cpp int &foo1(); int &foo2(); void c1() { int &x = (foo1(), foo2()); // CRASH } ``` This simple patch fixes this issue.

This PR addresses llvm#90. It introduces a new type constraint `CIR_AnyType` which allows CIR types and MLIR floating-point types. Present `AnyType` constraints are replaced with the new `CIR_AnyType` constraint.

Arrays can be first declared without a known bound, and then defined with a known bound. For example: ```cpp extern int data[]; int test() { return data[1]; } int data[3] {1, 2, 3}; ``` Currently `clangir` crashes on generating CIR for this case. This is due to the type of the `data` definition being different from its declaration. This patch adds support for such a case.

…vm#381)

Breaks the pass into smaller more manageable rewrites.

… the files (llvm#390) Fixes llvm#345

…IdiomRecognizer. (llvm#389) Some tests started failing under `-DLLVM_USE_SANITIZER=Address` due to trivial use-after-free errors.

Like SCF's `scf.condition`, the `cir.condition` simplifies codegen of loop conditions by removing the need of a contitional branch. It takes a single boolean operand which, if true, executes the body region, otherwise exits the loop. This also simplifies lowering and the dialect it self. A new constraint is now enforced on `cir.loops`: the condition region must terminate with a `cir.condition` operation. A few tests were removed as they became redundant, and others where simplified. The merge-cleanups pass no longer simplifies compile-time constant conditions, as the condition body terminator is no longer allowed to be terminated with a `cir.yield`. To circumvent this, a proper folder should be implemented to fold constant conditions, but this was left as future work. Co-authored-by: Bruno Cardoso Lopes <[email protected]>

Once the LexicalScope goes out of scope, its cleanup process will also check if a return was set to be yielded, and, if so, generate the yield with the respective value. ghstack-source-id: 9305d2ba5631840937721755358a774dc9e08b90 Pull Request resolved: llvm#312

Instead of returning a boolean indicating whether the statement was handled, returns the ReturnExpr of the statement if there is one. It also adds some extra bookkeeping to ensure that the result is returned when needed. This allows for better support of GCC's `ExprStmt` extension. The logical result was not used: it was handled but it would never fail. Any errors within builders should likely be handled with asserts and unreachables since they imply a programmer's error in the code. ghstack-source-id: 2319cf3f12e56374a52aaafa4304e74de3ee6453 Pull Request resolved: llvm#313

Adds support for GCC statement expressions return values as well as StmtExpr LValue emissions. To simplify the lowering process, the scope return value is not used. Instead, a temporary allocation is created on the parent scope where the return value is stored. For classes, a second scope is created around this temporary allocation to ensure any destructors are called. This does not implement the full semantics of statement expressions. ghstack-source-id: 64e03fc3df45975590ddbcab44959c2b49601101 Pull Request resolved: llvm#314

wenpen · 2024-05-11T06:13:40Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

+  // TODO: Rewrite the logic to handle ReturnStmt inside SwitchStmt, then
+  //       clean up the code below.
+  if (currLexScope->IsInsideCaseNoneStmt)
+    return mlir::success();


I found many sample code that failed due to incorrect terminator in block, e.g.

switch(a) { case 0: break; int x = 1; }

switch(a) { case 0: return 0; return 1; int x = 1; }

for (;;) { break; int x = 1; }

Looks like it's another large work, so I just skip ReturnStmt here.

Right, can you file a new issue and list these?

I'm opposed to return mlir::success(); because it will just silently skips something we don't know how to handle, I rather these things fails or crash, so that it's clear that they aren't implemented? What happens when you remove this return?

bcardosolopes · 2024-05-13T22:33:38Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

@@ -328,6 +328,14 @@ mlir::LogicalResult CIRGenFunction::buildLabelStmt(const clang::LabelStmt &S) {
  // IsEHa: not implemented.
  assert(!(getContext().getLangOpts().EHAsynch && S.isSideEntry()));

+  // TODO: After support case stmt crossing scopes, we should build LabelStmt


Any TODO in CIRGen should be TODO(cir)

bcardosolopes · 2024-05-13T22:42:19Z

clang/lib/CIR/CodeGen/CIRGenFunction.h

@@ -2027,6 +2031,8 @@ class CIRGenFunction : public CIRGenTypeCache {
    // Scope entry block tracking
    mlir::Block *getEntryBlock() { return EntryBlock; }

+    bool IsInsideCaseNoneStmt = false;


I don't think we need this, reasons below.

bcardosolopes · 2024-05-13T22:49:19Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

+  //       and clean LexicalScope::IsInsideCaseNoneStmt.
+  for (auto *lexScope = currLexScope; lexScope;
+       lexScope = lexScope->getParentScope()) {
+    assert(!lexScope->IsInsideCaseNoneStmt &&


What happens if you remove this code? Also, why doesn't it work to just walk the scope up until you find a switch?

Firstly, we won't need this assert anymore if we could keep the case none stmt somehow as you suggested.

What happens if you remove this code?

Remove this code won't cause incorrect behavior currently (as we didn't support goto in that case yet), but I think it may produce strange error message in the future.

switch (int x) { foo: x = 1; break; case 2: goto foo; }

We need to avoid erasing the CaseNoneStmt containing label foo.

why doesn't it work to just walk the scope up until you find a switch?

Refer to the below code, we need to guarantee the removed Stmt won't contain any LabelStmt, whether the LabelStmt is inside another nested switch or not.

switch(x) { switch(x) { case 1: foo: break; } break; case 1: goto foo; }

bcardosolopes · 2024-05-13T22:50:20Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

+  // TODO: Rewrite the logic to handle ReturnStmt inside SwitchStmt, then
+  //       clean up the code below.
+  if (currLexScope->IsInsideCaseNoneStmt)
+    return mlir::success();


Right, can you file a new issue and list these?

bcardosolopes · 2024-05-13T22:51:33Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

+  // TODO: Rewrite the logic to handle ReturnStmt inside SwitchStmt, then
+  //       clean up the code below.
+  if (currLexScope->IsInsideCaseNoneStmt)
+    return mlir::success();


I'm opposed to return mlir::success(); because it will just silently skips something we don't know how to handle, I rather these things fails or crash, so that it's clear that they aren't implemented? What happens when you remove this return?

bcardosolopes · 2024-05-13T22:57:44Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

@@ -704,6 +717,22 @@ CIRGenFunction::buildSwitchCase(const SwitchCase &S, mlir::Type condType,
  llvm_unreachable("expect case or default stmt");
 }

+mlir::LogicalResult CIRGenFunction::buildCaseNoneStmt(const Stmt *S) {
+  // Create orphan region to skip over the case none stmts.


Because you are creating an orphan region, this mean that anything emitted inside a buildCaseNoneStmt will never execute, right? The problem if a orphan region is that it won't get attached to anything, so it really adds no value (not even for unrecheable code analysis). If so, better just to split the current basic block A into two: B and C. A should jump to C and you emit the code in B.

I didn't find a good place to hold the block of CaseNoneStmt.

For example

void f(int x) { switch(x) { break; } }

There is no region inside SwitchOp, so we have to put the break block outside SwitchOp, which cause verification failed: 'cir.break' op must be within a loop or switch.

Did I misunderstand something? Looking forward to your suggestions~

I understand your point, but if you go for the current approach you might as well skip this codegen entirely, because what you are emitting won't ever be attached to anything. I think it's safer to mimic the original codegen here, what is Clang currently doing for OG codegen?

Perhaps we should create a SwitchOp with at least one default region and delete that at the end if it ends up unused?

wenpen

I also feel the solution about #521 is not very natural, so I'll be happy to modify it if you have some ideas. Or I could revert the change and only solve #520 in this pr, if you think the definition of SwitchOp should be changed firstly. Thanks!

wenpen · 2024-05-17T06:22:45Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

@@ -704,6 +717,22 @@ CIRGenFunction::buildSwitchCase(const SwitchCase &S, mlir::Type condType,
  llvm_unreachable("expect case or default stmt");
 }

+mlir::LogicalResult CIRGenFunction::buildCaseNoneStmt(const Stmt *S) {
+  // Create orphan region to skip over the case none stmts.


I didn't find a good place to hold the block of CaseNoneStmt.

For example

void f(int x) { switch(x) { break; } }

There is no region inside SwitchOp, so we have to put the break block outside SwitchOp, which cause verification failed: 'cir.break' op must be within a loop or switch.

Did I misunderstand something? Looking forward to your suggestions~

wenpen · 2024-05-17T06:57:23Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

+  //       and clean LexicalScope::IsInsideCaseNoneStmt.
+  for (auto *lexScope = currLexScope; lexScope;
+       lexScope = lexScope->getParentScope()) {
+    assert(!lexScope->IsInsideCaseNoneStmt &&


Firstly, we won't need this assert anymore if we could keep the case none stmt somehow as you suggested.

What happens if you remove this code?

Remove this code won't cause incorrect behavior currently (as we didn't support goto in that case yet), but I think it may produce strange error message in the future.

switch (int x) { foo: x = 1; break; case 2: goto foo; }

We need to avoid erasing the CaseNoneStmt containing label foo.

why doesn't it work to just walk the scope up until you find a switch?

Refer to the below code, we need to guarantee the removed Stmt won't contain any LabelStmt, whether the LabelStmt is inside another nested switch or not.

switch(x) { switch(x) { case 1: foo: break; } break; case 1: goto foo; }

wenpen · 2024-05-17T07:19:05Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

+  // TODO(cir): Rewrite the logic to handle ReturnStmt inside SwitchStmt, then
+  // clean up the code below.
+  if (currLexScope->IsInsideCaseNoneStmt)
+    return mlir::success();
+


I'm opposed to return mlir::success(); because it will just silently skips something we don't know how to handle, I rather these things fails or crash, so that it's clear that they aren't implemented? What happens when you remove this return?

buildReturnStmt() assume there is exactly one return block in a region, and there is one region in a lexical scope, the only exceptions are switch scope, which has multiple regions. The related code is

mlir::Block *getOrCreateRetBlock(CIRGenFunction &CGF, mlir::Location loc) { unsigned int regionIdx = 0; if (isSwitch()) regionIdx = SwitchRegions.size() - 1; if (regionIdx >= RetBlocks.size()) return createRetBlock(CGF, loc); return &*RetBlocks.back(); }

So if we remove the return here, the following code will cause crash. regionIdx will be -1, and we'll call RetBlocks .back() with empty RetBlocks

int f(int x) { switch(x) { return 0; } return 1; }

By the way, I believe the current implementation of getOrCreateRetBlock() about switch is incorrect and also should be solved after changing definition of SwitchOp.

By the way, I believe the current implementation of getOrCreateRetBlock() about switch is incorrect and also should be solved after changing definition of SwitchOp.

Right, we should fix the logic, not take shortcuts like returning mlir::success(). Can you elaborate on what do you mean by changing the definition of SwitchOp?

I posted my thought in #528 to discuss it, thanks~

bcardosolopes · 2024-06-03T22:36:26Z

I'm going to resume reviewing this, sorry for the delay!

bcardosolopes · 2024-06-06T22:45:34Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

@@ -704,6 +717,22 @@ CIRGenFunction::buildSwitchCase(const SwitchCase &S, mlir::Type condType,
  llvm_unreachable("expect case or default stmt");
 }

+mlir::LogicalResult CIRGenFunction::buildCaseNoneStmt(const Stmt *S) {
+  // Create orphan region to skip over the case none stmts.


I understand your point, but if you go for the current approach you might as well skip this codegen entirely, because what you are emitting won't ever be attached to anything. I think it's safer to mimic the original codegen here, what is Clang currently doing for OG codegen?

bcardosolopes · 2024-06-06T22:49:36Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

+  // TODO(cir): Rewrite the logic to handle ReturnStmt inside SwitchStmt, then
+  // clean up the code below.
+  if (currLexScope->IsInsideCaseNoneStmt)
+    return mlir::success();
+


By the way, I believe the current implementation of getOrCreateRetBlock() about switch is incorrect and also should be solved after changing definition of SwitchOp.

Right, we should fix the logic, not take shortcuts like returning mlir::success(). Can you elaborate on what do you mean by changing the definition of SwitchOp?

bcardosolopes · 2024-06-06T22:50:12Z

clang/lib/CIR/CodeGen/CIRGenStmt.cpp

@@ -704,6 +717,22 @@ CIRGenFunction::buildSwitchCase(const SwitchCase &S, mlir::Type condType,
  llvm_unreachable("expect case or default stmt");
 }

+mlir::LogicalResult CIRGenFunction::buildCaseNoneStmt(const Stmt *S) {
+  // Create orphan region to skip over the case none stmts.


Perhaps we should create a SwitchOp with at least one default region and delete that at the end if it ends up unused?

bcardosolopes · 2024-06-06T22:58:36Z

I landed #611 which has some comments related to this PR (cc: @piggynl)

Make logic cleaner and more extensible. Separate collecting `SwitchStmt` information and building op logic into different functions. Add more UT to cover nested switch, which also worked before this pr. This pr is split from llvm#528.

smeenai · 2024-10-29T18:03:06Z

This was superseded by #1006; thank you for laying the groundwork for it!

Make logic cleaner and more extensible. Separate collecting `SwitchStmt` information and building op logic into different functions. Add more UT to cover nested switch, which also worked before this pr. This pr is split from #528.

bcardosolopes and others added 30 commits November 3, 2023 15:23

Revert "[CIR][CIRGen][Exception] Workaround internal testcase break"

94d428b

This reverts commit 55c03f8

[CIR] Change mock std::array iterator definitions

d5b3cc1

This is how both libc++ and libstdc++ implement iterator in std::array, stick to those use cases for now. We could add other variations in the future if there are others around.

[CIR][IdiomRecognizer] Make iterator recognition more strict

8fb3356

- Check whether container is part of std, add a fixed list of available containers (for now only std::array) - Add a getRawDecl method to ASTRecordDeclInterface - Testcases

[CIR] Cleanup idiom-recognizer and lib-opt options

28bf4ec

This was a bit half backed, give it some love.

[CIR][LibOpt] Add a first transformation: std::find to memchr

2fdc25b

Inspired by similar work in libc++, pointed to me by Louis Dionne and Nikolas Klauser. This is initial, very conservative and not generalized yet: works for `char`s within a specific version of `std::find`.

[mlir][llvm] Fixes CallOp builder for the case of indirect call

1139cfe

[CIR][CodeGen] Fix flat offset lowering code to consider field alignm…

cb09502

…ents. Before this fix conversion of flat offset to GlobalView indices could crash or compute invalid result.

Revert "[mlir][llvm] Fixes CallOp builder for the case of indirect call"

8d37db3

This reverts commit bbaa147.

[CIR][Lowering][Bugfix] Lower ScopeOp with return op (llvm#364)

cb185ad

`ScopeOp` may end with `ReturnOp` instead of `YieldOp`, that is not expected now. This PR fix this. The reduced example is: ``` int foo() { { return 0; } } ``` This is quite frequent bug in `llvm-test-suite`

[CIR][CodeGen] Support lowering of cir.const with ZeroAttr. (llvm#365)

7d4101a

[CIR][Lowering][Bugfix] explicit lowering for the indirect call

67da9e6

[CIR][CIRGen] supports struct copy from function call result (llvm#369)

b21e81e

This PR fixes the next case ``` typedef struct { } A; A create() { A a; return a; } void foo() { A a; a = create(); } ``` i.e. when a struct is assigned to a function call result

[CIR][CodeGen] Fix lowering for class types (llvm#378)

ead25fe

[CIR][CIRGen] Lvalues and comma expression (llvm#376)

2bde4fe

Currently, codegen of lvalue comma expression would crash: ```cpp int &foo1(); int &foo2(); void c1() { int &x = (foo1(), foo2()); // CRASH } ``` This simple patch fixes this issue.

[CIR] Replace AnyType with CIR_AnyType (llvm#371)

6a0e742

This PR addresses llvm#90. It introduces a new type constraint `CIR_AnyType` which allows CIR types and MLIR floating-point types. Present `AnyType` constraints are replaced with the new `CIR_AnyType` constraint.

[CIR][CIRGen] Implement constant evaluation for integral builtins (ll…

0affd8d

…vm#381)

[CIR][Transforms][NFC] Refactor MergeCleanups pass (llvm#384)

3aeb3e0

Breaks the pass into smaller more manageable rewrites.

[CIR][NFC] Enable the formatting workflow for llvm/clangir and format…

006dfd0

… the files (llvm#390) Fixes llvm#345

[CIR][Transforms][Bugfix] Do not use-after-free in MergeCleanups and …

67859c4

…IdiomRecognizer. (llvm#389) Some tests started failing under `-DLLVM_USE_SANITIZER=Address` due to trivial use-after-free errors.

[CIR][NFC] Canonicalize the names of the lowering classes

8fa0bbb

address

9ae5d1f

wenpen force-pushed the switch_support_single_case branch from 5223c3c to 9ae5d1f Compare May 10, 2024 11:06

wenpen commented May 11, 2024

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wenpen requested a review from bcardosolopes May 11, 2024 06:14

wenpen marked this pull request as ready for review May 11, 2024 06:59

bcardosolopes requested changes May 13, 2024

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piggynl mentioned this pull request May 16, 2024

[CIR][CIRGen] Create a new block after break and continue #611

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address

7a61b3c

wenpen force-pushed the switch_support_single_case branch from f726860 to 7a61b3c Compare May 17, 2024 05:48

wenpen commented May 17, 2024

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bcardosolopes changed the title ~~[CIR][CIRGen] Enhance switch~~ [CIR][CIRGen] Improve switch support for unrecheable code Jun 6, 2024

wenpen mentioned this pull request Jun 9, 2024

Assertion failure on switch statement with case label in nested block #522

Closed

lanza force-pushed the main branch from 8829868 to c290c04 Compare June 21, 2024 19:50

lanza self-requested a review as a code owner June 21, 2024 19:50

lanza force-pushed the main branch from 67ce904 to 845c25a Compare September 19, 2024 03:42

This was referenced Sep 24, 2024

Crash with label with break in a switch case #876

Closed

[CIR][CodeGen] Handle the case of 'case' after label statement after 'case' #879

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lanza force-pushed the main branch from 605343a to 4c44bf1 Compare October 2, 2024 05:01

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[CIR][CIRGen] Improve switch support for unrecheable code #528

[CIR][CIRGen] Improve switch support for unrecheable code #528

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[CIR][CIRGen] Improve switch support for unrecheable code #528

[CIR][CIRGen] Improve switch support for unrecheable code #528

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