351762cda2
- BlockDeclRefExprs always store VarDecls
- BDREs no longer store copy expressions
- BlockDecls now store a list of captured variables, information about
how they're captured, and a copy expression if necessary
With that in hand, change IR generation to use the captures data in
blocks instead of walking the block independently.
Additionally, optimize block layout by emitting fields in descending
alignment order, with a heuristic for filling in words when alignment
of the end of the block header is insufficient for the most aligned
field.
llvm-svn: 125005
97 lines
3.7 KiB
C
97 lines
3.7 KiB
C
// RUN: %clang_cc1 -fblocks -triple x86_64-apple-darwin9 %s -emit-llvm -o - | FileCheck %s -check-prefix=X64
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// RUN: %clang_cc1 -fblocks -triple i686-apple-darwin9 %s -emit-llvm -o - | FileCheck %s -check-prefix=X32
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// X64: @.str = private unnamed_addr constant [6 x i8] c"v8@?0\00"
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// X64: @__block_literal_global = internal constant %1 { i8** @_NSConcreteGlobalBlock, i32 1342177280,
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// X64: @.str1 = private unnamed_addr constant [12 x i8] c"i16@?0c8f12\00"
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// X64: store i32 1073741824, i32*
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// X32: [[STR1:@.*]] = private unnamed_addr constant [6 x i8] c"v4@?0\00"
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// X32: @__block_descriptor_tmp = internal constant [[FULL_DESCRIPTOR_T:%.*]] { i32 0, i32 20, i8* getelementptr inbounds ([6 x i8]* [[STR1]], i32 0, i32 0), i8* null }
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// X32: @__block_literal_global = internal constant [[GLOBAL_LITERAL_T:%.*]] { i8** @_NSConcreteGlobalBlock, i32 1342177280, i32 0, i8* bitcast (void (i8*)* @__block_global_{{.*}} to i8*), [[DESCRIPTOR_T:%.*]]* bitcast ([[FULL_DESCRIPTOR_T]]* @__block_descriptor_tmp to {{%.*}}*) }
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// X32: [[STR2:@.*]] = private unnamed_addr constant [11 x i8] c"i12@?0c4f8\00"
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// X32: @__block_descriptor_tmp{{.*}} = internal constant [[FULL_DESCRIPTOR_T]] { i32 0, i32 24, i8* getelementptr inbounds ([11 x i8]* [[STR2]], i32 0, i32 0), i8* null }
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// X32: store i32 1073741824, i32*
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// rdar://7635294
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int globalInt;
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void (^global)(void) = ^{ ++globalInt; };
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void foo(int param) {
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extern int rand(void);
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extern void rand_r(int (^b)(char x, float y)); // name a function present at runtime
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while (param--)
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rand_r(^(char x, float y){ return x + (int)y + param + rand(); }); // generate a local block binding param
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}
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#if 0
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#include <stdio.h>
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enum {
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BLOCK_HAS_COPY_DISPOSE = (1 << 25),
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BLOCK_HAS_CXX_OBJ = (1 << 26),
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BLOCK_IS_GLOBAL = (1 << 28),
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BLOCK_HAS_DESCRIPTOR = (1 << 29),
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BLOCK_HAS_OBJC_TYPE = (1 << 30)
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};
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struct block_descriptor_big {
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unsigned long int reserved;
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unsigned long int size;
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void (*copy)(void *dst, void *src); // conditional on BLOCK_HAS_COPY_DISPOSE
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void (*dispose)(void *); // conditional on BLOCK_HAS_COPY_DISPOSE
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const char *signature; // conditional on BLOCK_HAS_OBJC
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const char *layout; // conditional on BLOCK_HAS_OBJC
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};
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struct block_descriptor_small {
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unsigned long int reserved;
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unsigned long int size;
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const char *signature; // conditional on BLOCK_HAS_OBJC
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const char *layout; // conditional on BLOCK_HAS_OBJC
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};
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struct block_layout_abi { // can't change
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void *isa;
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int flags;
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int reserved;
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void (*invoke)(void *, ...);
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struct block_descriptor_big *descriptor;
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};
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const char *getBlockSignature(void *block) {
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struct block_layout_abi *layout = (struct block_layout_abi *)block;
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if ((layout->flags & BLOCK_HAS_OBJC_TYPE) != BLOCK_HAS_OBJC_TYPE) return NULL;
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if (layout->flags & BLOCK_HAS_COPY_DISPOSE)
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return layout->descriptor->signature;
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else
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return ((struct block_descriptor_small *)layout->descriptor)->signature;
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}
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int main(int argc, char *argv[]) {
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printf("desired global flags: %d\n", BLOCK_IS_GLOBAL | BLOCK_HAS_OBJC_TYPE);
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printf("desired stack flags: %d\n", BLOCK_HAS_OBJC_TYPE);
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printf("types for global: %s\n", getBlockSignature(global));
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printf("types for local: %s\n", getBlockSignature(^int(char x, float y) { return (int)(y + x); }));
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return 0;
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}
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/*
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x86_64
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desired global flags: 1342177280
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desired stack flags: 1073741824
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types for global: v8@?0
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types for local: i16@?0c8f12
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i386
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desired global flags: 1342177280
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desired stack flags: 1073741824
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types for global: v4@?0
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types for local: i12@?0c4f8
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*/
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#endif
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