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Remove offset size check in nullptr arithmetic handling 

Differential Revision: https://reviews.llvm.org/D37042



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@313784 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Kaylor 2017-09-20 18:06:44 +00:00
parent f6e021e7e9
commit 93bd7cd32d
4 changed files with 17 additions and 7 deletions
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7
lib/AST/Expr.cpp
View File

@ -1837,17 +1837,14 @@ bool BinaryOperator::isNullPointerArithmeticExtension(ASTContext &Ctx,
// Check that we have one pointer and one integer operand.
Expr *PExp;
Expr *IExp;
if (LHS->getType()->isPointerType()) {
if (!RHS->getType()->isIntegerType())
return false;
PExp = LHS;
IExp = RHS;
} else if (RHS->getType()->isPointerType()) {
if (!LHS->getType()->isIntegerType())
return false;
PExp = RHS;
IExp = LHS;
} else {
return false;
}
@ -1862,10 +1859,6 @@ bool BinaryOperator::isNullPointerArithmeticExtension(ASTContext &Ctx,
if (!PTy || !PTy->getPointeeType()->isCharType())
return false;
// Check that the integer type is pointer-sized.
if (Ctx.getTypeSize(IExp->getType()) != Ctx.getTypeSize(PExp->getType()))
return false;
return true;
}
InitListExpr::InitListExpr(const ASTContext &C, SourceLocation lbraceloc,

13
test/CodeGen/nullptr-arithmetic.c
View File

@ -1,4 +1,6 @@
// RUN: %clang_cc1 -S %s -emit-llvm -o - | FileCheck %s
// RUN: %clang_cc1 -S %s -emit-llvm -triple i686-unknown-unknown -o - | FileCheck %s
// RUN: %clang_cc1 -S %s -emit-llvm -triple x86_64-unknown-unknown -o - | FileCheck %s
#include <stdint.h>
@ -32,3 +34,14 @@ int8_t* test3(intptr_t n) {
// CHECK-LABEL: test3
// CHECK: getelementptr
// CHECK-NOT: inttoptr
// This checks the case where the offset isn't pointer-sized.
// The front end will implicitly cast the offset to an integer, so we need to
// make sure that doesn't cause problems on targets where integers and pointers
// are not the same size.
int8_t *test4(int8_t b) {
return NULLPTRI8 + b;
}
// CHECK-LABEL: test4
// CHECK: inttoptr
// CHECK-NOT: getelementptr

2
test/Sema/pointer-addition.c
View File

@ -1,4 +1,6 @@
// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wextra -std=c11
// RUN: %clang_cc1 %s -fsyntax-only -triple i686-unknown-unknown -verify -pedantic -Wextra -std=c11
// RUN: %clang_cc1 %s -fsyntax-only -triple x86_64-unknown-unknown -verify -pedantic -Wextra -std=c11
#include <stdint.h>

2
test/SemaCXX/nullptr-arithmetic.cpp
View File

@ -1,4 +1,6 @@
// RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic -Wextra -std=c++11
// RUN: %clang_cc1 %s -fsyntax-only -triple i686-unknown-unknown -verify -pedantic -Wextra -std=c++11
// RUN: %clang_cc1 %s -fsyntax-only -triple x86_64-unknown-unknown -verify -pedantic -Wextra -std=c++11
#include <stdint.h>