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https://github.com/Gericom/teak-llvm.git
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2ec36f08a6
Currently, clang generates a new block descriptor global variable for each new block literal. This commit merges block descriptors that are identical inside and across translation units using the same approach taken in r339438. To enable merging identical block descriptors, the size and signature of the block and information about the captures are encoded into the name of the block descriptor variable. Also, the block descriptor variable is marked as linkonce_odr and unnamed_addr. rdar://problem/42640703 Differential Revision: https://reviews.llvm.org/D50783 llvm-svn: 340041
51 lines
1.7 KiB
Objective-C
51 lines
1.7 KiB
Objective-C
// RUN: %clang_cc1 -fblocks -fobjc-arc -fobjc-runtime-has-weak -triple i386-apple-darwin -print-ivar-layout -emit-llvm -o /dev/null %s > %t-32.layout
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// RUN: FileCheck --input-file=%t-32.layout %s
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// rdar://12184410
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// rdar://12752901
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@class NSString;
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extern void NSLog(NSString *format, ...);
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extern int printf(const char *, ...);
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int main() {
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NSString *strong;
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unsigned long long eightByte = 0x8001800181818181ull;
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// Test1
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// CHECK: Inline block variable layout: 0x0100, BL_STRONG:1, BL_OPERATOR:0
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void (^block1)() = ^{ printf("%#llx", eightByte); NSLog(@"%@", strong); };
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// Test2
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int i = 1;
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// CHECK: Inline block variable layout: 0x0100, BL_STRONG:1, BL_OPERATOR:0
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void (^block2)() = ^{ printf("%#llx, %d", eightByte, i); NSLog(@"%@", strong); };
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// Test3
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char ch = 'a';
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// CHECK: Inline block variable layout: 0x0100, BL_STRONG:1, BL_OPERATOR:0
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void (^block3)() = ^{ printf("%c %#llx", ch, eightByte); NSLog(@"%@", strong); };
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// Test4
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unsigned long fourByte = 0x8001ul;
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// CHECK: Inline block variable layout: 0x0100, BL_STRONG:1, BL_OPERATOR:0
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void (^block4)() = ^{ printf("%c %#lx", ch, fourByte); NSLog(@"%@", strong); };
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// Test5
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// Nothing gets printed here since the descriptor of this block is merged with
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// the descriptor of Test3's block.
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void (^block5)() = ^{ NSLog(@"%@", strong); printf("%c %#llx", ch, eightByte); };
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// Test6
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// CHECK: Block variable layout: BL_OPERATOR:0
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void (^block6)() = ^{ printf("%#llx", eightByte); };
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}
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/**
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struct __block_literal_generic { // 32bytes (64bit) and 20 bytes (32bit).
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0 void *__isa;
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4 int __flags;
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8 int __reserved;
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12 void (*__invoke)(void *);
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16 struct __block_descriptor *__descriptor;
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};
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*/
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