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bpo-33351: Correct struct packing in _tracemalloc.c by emmatyping · Pull Request #6761 · python/cpython · GitHub

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bpo-33351: Correct struct packing in _tracemalloc.c #6761

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emmatyping wants to merge 3 commits into from
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bpo-33351: Correct struct packing in _tracemalloc.c #6761

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de45e32
Correct struct packing in _tracemalloc.c
emmatyping May 10, 2018
50220c8
Add NEWS file
emmatyping May 16, 2018
bbdced5
Merge branch 'master' into clangwin
emmatyping Jun 6, 2018
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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Build/2018-05-16-15-34-16.bpo-33351.8c-SEp.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
Add struct packing for pointer_t and fix struct packing under clang-cl for
frame_t.

Patch by Ethan Smith
13 changes: 10 additions & 3 deletions Modules/_tracemalloc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,10 @@ static PyThread_type_lock tables_lock;

#define DEFAULT_DOMAIN 0

/* Pack the frame_t structure to reduce the memory footprint. */
/* Pack the pointer_t structure to reduce the memory footprint. */
#if defined(_MSC_VER)
#pragma pack(push, 4)
#endif
typedef struct
#ifdef __GNUC__
__attribute__((packed))
Expand All @@ -76,14 +79,18 @@ __attribute__((packed))
uintptr_t ptr;
unsigned int domain;
} pointer_t;
#ifdef _MSC_VER
#pragma pack(pop)
#endif

/* Pack the frame_t structure to reduce the memory footprint on 64-bit
architectures: 12 bytes instead of 16. */
#if defined(_MSC_VER)
#pragma pack(push, 4)
#endif
typedef struct
#ifdef __GNUC__
__attribute__((packed))
#elif defined(_MSC_VER)
#pragma pack(push, 4)
#endif
{
/* filename cannot be NULL: "<unknown>" is used if the Python frame
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