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[IR] Add verifier support for llvm.module.flags.
- Also, update the LangRef documentation on module flags to match the implementation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172498 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2462,14 +2462,16 @@ Each triplet has the following form:
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(or more) metadata with the same ID. The supported behaviors are
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(or more) metadata with the same ID. The supported behaviors are
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described below.
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described below.
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- The second element is a metadata string that is a unique ID for the
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- The second element is a metadata string that is a unique ID for the
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metadata. How each ID is interpreted is documented below.
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metadata. Each module may only have one flag entry for each unique ID (not
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including entries with the **Require** behavior).
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- The third element is the value of the flag.
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- The third element is the value of the flag.
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When two (or more) modules are merged together, the resulting
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When two (or more) modules are merged together, the resulting
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``llvm.module.flags`` metadata is the union of the modules'
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``llvm.module.flags`` metadata is the union of the modules' flags. That is, for
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``llvm.module.flags`` metadata. The only exception being a flag with the
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each unique metadata ID string, there will be exactly one entry in the merged
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*Override* behavior, which may override another flag's value (see
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modules ``llvm.module.flags`` metadata table, and the value for that entry will
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below).
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be determined by the merge behavior flag, as described below. The only exception
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is that entries with the *Require* behavior are always preserved.
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The following behaviors are supported:
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The following behaviors are supported:
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@ -2482,25 +2484,33 @@ The following behaviors are supported:
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* - 1
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* - 1
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- **Error**
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- **Error**
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Emits an error if two values disagree. It is an error to have an
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Emits an error if two values disagree, otherwise the resulting value
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ID with both an Error and a Warning behavior.
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is that of the operands.
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* - 2
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* - 2
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- **Warning**
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- **Warning**
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Emits a warning if two values disagree.
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Emits a warning if two values disagree. The result value will be the
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operand for the flag from the first module being linked.
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* - 3
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* - 3
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- **Require**
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- **Require**
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Emits an error when the specified value is not present or doesn't
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Adds a requirement that another module flag be present and have a
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have the specified value. It is an error for two (or more)
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specified value after linking is performed. The value must be a
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``llvm.module.flags`` with the same ID to have the Require behavior
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metadata pair, where the first element of the pair is the ID of the
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but different values. There may be multiple Require flags per ID.
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module flag to be restricted, and the second element of the pair is
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the value the module flag should be restricted to. This behavior can
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be used to restrict the allowable results (via triggering of an
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error) of linking IDs with the **Override** behavior.
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* - 4
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* - 4
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- **Override**
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- **Override**
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Uses the specified value if the two values disagree. It is an
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Uses the specified value, regardless of the behavior or value of the
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error for two (or more) ``llvm.module.flags`` with the same ID
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other module. If both modules specify **Override**, but the values
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to have the Override behavior but different values.
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differ, an error will be emitted.
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It is an error for a particular unique flag ID to have multiple behaviors,
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except in the case of **Require** (which adds restrictions on another metadata
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value) or **Override**.
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An example of module flags:
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An example of module flags:
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@ -2522,7 +2532,7 @@ An example of module flags:
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- Metadata ``!1`` has the ID ``!"bar"`` and the value '37'. The
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- Metadata ``!1`` has the ID ``!"bar"`` and the value '37'. The
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behavior if two or more ``!"bar"`` flags are seen is to use the value
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behavior if two or more ``!"bar"`` flags are seen is to use the value
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'37' if their values are not equal.
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'37'.
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- Metadata ``!2`` has the ID ``!"qux"`` and the value '42'. The
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- Metadata ``!2`` has the ID ``!"qux"`` and the value '42'. The
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behavior if two or more ``!"qux"`` flags are seen is to emit a
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behavior if two or more ``!"qux"`` flags are seen is to emit a
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@ -2534,10 +2544,9 @@ An example of module flags:
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metadata !{ metadata !"foo", i32 1 }
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metadata !{ metadata !"foo", i32 1 }
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The behavior is to emit an error if the ``llvm.module.flags`` does
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The behavior is to emit an error if the ``llvm.module.flags`` does not
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not contain a flag with the ID ``!"foo"`` that has the value '1'. If
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contain a flag with the ID ``!"foo"`` that has the value '1' after linking is
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two or more ``!"qux"`` flags exist, then they must have the same
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performed.
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value or an error will be issued.
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Objective-C Garbage Collection Module Flags Metadata
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Objective-C Garbage Collection Module Flags Metadata
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----------------------------------------------------
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----------------------------------------------------
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@ -200,6 +200,8 @@ namespace {
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E = M.named_metadata_end(); I != E; ++I)
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E = M.named_metadata_end(); I != E; ++I)
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visitNamedMDNode(*I);
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visitNamedMDNode(*I);
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visitModuleFlags(M);
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// If the module is broken, abort at this time.
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// If the module is broken, abort at this time.
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return abortIfBroken();
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return abortIfBroken();
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}
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}
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@ -240,6 +242,8 @@ namespace {
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void visitGlobalAlias(GlobalAlias &GA);
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void visitGlobalAlias(GlobalAlias &GA);
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void visitNamedMDNode(NamedMDNode &NMD);
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void visitNamedMDNode(NamedMDNode &NMD);
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void visitMDNode(MDNode &MD, Function *F);
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void visitMDNode(MDNode &MD, Function *F);
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void visitModuleFlags(Module &M);
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void visitModuleFlag(MDNode *Op, SmallSetVector<MDString*, 16> &SeenIDs);
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void visitFunction(Function &F);
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void visitFunction(Function &F);
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void visitBasicBlock(BasicBlock &BB);
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void visitBasicBlock(BasicBlock &BB);
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using InstVisitor<Verifier>::visit;
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using InstVisitor<Verifier>::visit;
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@ -521,6 +525,59 @@ void Verifier::visitMDNode(MDNode &MD, Function *F) {
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}
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}
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}
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}
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void Verifier::visitModuleFlags(Module &M) {
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const NamedMDNode *Flags = M.getModuleFlagsMetadata();
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if (!Flags) return;
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// Scan each flag.
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SmallSetVector<MDString*, 16> SeenIDs;
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for (unsigned I = 0, E = Flags->getNumOperands(); I != E; ++I) {
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visitModuleFlag(Flags->getOperand(I), SeenIDs);
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}
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}
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void Verifier::visitModuleFlag(MDNode *Op,
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SmallSetVector<MDString*, 16> &SeenIDs) {
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// Each module flag should have three arguments, the merge behavior (a
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// constant int), the flag ID (an MDString), and the value.
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Assert1(Op->getNumOperands() == 3,
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"incorrect number of operands in module flag", Op);
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ConstantInt *Behavior = dyn_cast<ConstantInt>(Op->getOperand(0));
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MDString *ID = dyn_cast<MDString>(Op->getOperand(1));
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Assert1(Behavior,
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"invalid behavior operand in module flag (expected constant integer)",
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Op->getOperand(0));
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unsigned BehaviorValue = Behavior->getZExtValue();
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Assert1((Module::Error <= BehaviorValue &&
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BehaviorValue <= Module::Override),
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"invalid behavior operand in module flag (unexpected constant)",
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Op->getOperand(0));
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Assert1(ID,
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"invalid ID operand in module flag (expected metadata string)",
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Op->getOperand(1));
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// Unless this is a "requires" flag, check the ID is unique.
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if (BehaviorValue != Module::Require) {
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Assert1(SeenIDs.insert(ID),
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"module flag identifiers must be unique (or of 'require' type)",
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ID);
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}
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// If this is a "requires" flag, sanity check the value.
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if (BehaviorValue == Module::Require) {
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// The value should itself be an MDNode with two operands, a flag ID (an
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// MDString), and a value.
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MDNode *Value = dyn_cast<MDNode>(Op->getOperand(2));
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Assert1(Value && Value->getNumOperands() == 2,
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"invalid value for 'require' module flag (expected metadata pair)",
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Op->getOperand(2));
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Assert1(isa<MDString>(Value->getOperand(0)),
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("invalid value for 'require' module flag "
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"(first value operand should be a string)"),
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Value->getOperand(0));
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}
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}
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// VerifyParameterAttrs - Check the given attributes for an argument or return
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// VerifyParameterAttrs - Check the given attributes for an argument or return
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// value of the specified type. The value V is printed in error messages.
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// value of the specified type. The value V is printed in error messages.
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void Verifier::VerifyParameterAttrs(Attribute Attrs, Type *Ty,
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void Verifier::VerifyParameterAttrs(Attribute Attrs, Type *Ty,
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37
test/Verifier/module-flags-1.ll
Normal file
37
test/Verifier/module-flags-1.ll
Normal file
@ -0,0 +1,37 @@
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; RUN: not llvm-as < %s -o /dev/null 2>&1 | FileCheck %s
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; Check that module flags are structurally correct.
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;
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; CHECK: incorrect number of operands in module flag
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; CHECK: metadata !0
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!0 = metadata !{ i32 1 }
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; CHECK: invalid behavior operand in module flag (expected constant integer)
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; CHECK: metadata !"foo"
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!1 = metadata !{ metadata !"foo", metadata !"foo", i32 42 }
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; CHECK: invalid behavior operand in module flag (unexpected constant)
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; CHECK: i32 999
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!2 = metadata !{ i32 999, metadata !"foo", i32 43 }
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; CHECK: invalid ID operand in module flag (expected metadata string)
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; CHECK: i32 1
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!3 = metadata !{ i32 1, i32 1, i32 44 }
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; CHECK: invalid value for 'require' module flag (expected metadata pair)
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; CHECK: i32 45
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!4 = metadata !{ i32 3, metadata !"bla", i32 45 }
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; CHECK: invalid value for 'require' module flag (expected metadata pair)
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; CHECK: metadata !
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!5 = metadata !{ i32 3, metadata !"bla", metadata !{ i32 46 } }
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; CHECK: invalid value for 'require' module flag (first value operand should be a string)
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; CHECK: i32 47
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!6 = metadata !{ i32 3, metadata !"bla", metadata !{ i32 47, i32 48 } }
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; Check that module flags only have unique IDs.
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;
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; CHECK: module flag identifiers must be unique (or of 'require' type)
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!7 = metadata !{ i32 1, metadata !"foo", i32 49 }
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!8 = metadata !{ i32 2, metadata !"foo", i32 50 }
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; CHECK-NOT: module flag identifiers must be unique
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!9 = metadata !{ i32 2, metadata !"bar", i32 51 }
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!10 = metadata !{ i32 3, metadata !"bar", i32 51 }
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!llvm.module.flags = !{
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!0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10 }
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