diff options
Diffstat (limited to 'src/common/code_block.h')
| -rw-r--r-- | src/common/code_block.h | 40 |
1 files changed, 18 insertions, 22 deletions
diff --git a/src/common/code_block.h b/src/common/code_block.h index 2fa4a0090..6a55a8e30 100644 --- a/src/common/code_block.h +++ b/src/common/code_block.h | |||
| @@ -5,7 +5,6 @@ | |||
| 5 | #pragma once | 5 | #pragma once |
| 6 | 6 | ||
| 7 | #include <cstddef> | 7 | #include <cstddef> |
| 8 | |||
| 9 | #include "common/common_types.h" | 8 | #include "common/common_types.h" |
| 10 | #include "common/memory_util.h" | 9 | #include "common/memory_util.h" |
| 11 | 10 | ||
| @@ -14,24 +13,27 @@ | |||
| 14 | // having to prefix them with gen-> or something similar. | 13 | // having to prefix them with gen-> or something similar. |
| 15 | // Example implementation: | 14 | // Example implementation: |
| 16 | // class JIT : public CodeBlock<ARMXEmitter> {} | 15 | // class JIT : public CodeBlock<ARMXEmitter> {} |
| 17 | template<class T> class CodeBlock : public T, NonCopyable | 16 | template <class T> |
| 18 | { | 17 | class CodeBlock : public T, NonCopyable { |
| 19 | private: | 18 | private: |
| 20 | // A privately used function to set the executable RAM space to something invalid. | 19 | // A privately used function to set the executable RAM space to something invalid. |
| 21 | // For debugging usefulness it should be used to set the RAM to a host specific breakpoint instruction | 20 | // For debugging usefulness it should be used to set the RAM to a host specific breakpoint |
| 21 | // instruction | ||
| 22 | virtual void PoisonMemory() = 0; | 22 | virtual void PoisonMemory() = 0; |
| 23 | 23 | ||
| 24 | protected: | 24 | protected: |
| 25 | u8 *region; | 25 | u8* region; |
| 26 | size_t region_size; | 26 | size_t region_size; |
| 27 | 27 | ||
| 28 | public: | 28 | public: |
| 29 | CodeBlock() : region(nullptr), region_size(0) {} | 29 | CodeBlock() : region(nullptr), region_size(0) {} |
| 30 | virtual ~CodeBlock() { if (region) FreeCodeSpace(); } | 30 | virtual ~CodeBlock() { |
| 31 | if (region) | ||
| 32 | FreeCodeSpace(); | ||
| 33 | } | ||
| 31 | 34 | ||
| 32 | // Call this before you generate any code. | 35 | // Call this before you generate any code. |
| 33 | void AllocCodeSpace(int size) | 36 | void AllocCodeSpace(int size) { |
| 34 | { | ||
| 35 | region_size = size; | 37 | region_size = size; |
| 36 | region = (u8*)AllocateExecutableMemory(region_size); | 38 | region = (u8*)AllocateExecutableMemory(region_size); |
| 37 | T::SetCodePtr(region); | 39 | T::SetCodePtr(region); |
| @@ -39,15 +41,13 @@ public: | |||
| 39 | 41 | ||
| 40 | // Always clear code space with breakpoints, so that if someone accidentally executes | 42 | // Always clear code space with breakpoints, so that if someone accidentally executes |
| 41 | // uninitialized, it just breaks into the debugger. | 43 | // uninitialized, it just breaks into the debugger. |
| 42 | void ClearCodeSpace() | 44 | void ClearCodeSpace() { |
| 43 | { | ||
| 44 | PoisonMemory(); | 45 | PoisonMemory(); |
| 45 | ResetCodePtr(); | 46 | ResetCodePtr(); |
| 46 | } | 47 | } |
| 47 | 48 | ||
| 48 | // Call this when shutting down. Don't rely on the destructor, even though it'll do the job. | 49 | // Call this when shutting down. Don't rely on the destructor, even though it'll do the job. |
| 49 | void FreeCodeSpace() | 50 | void FreeCodeSpace() { |
| 50 | { | ||
| 51 | #ifdef __SYMBIAN32__ | 51 | #ifdef __SYMBIAN32__ |
| 52 | ResetExecutableMemory(region); | 52 | ResetExecutableMemory(region); |
| 53 | #else | 53 | #else |
| @@ -57,33 +57,29 @@ public: | |||
| 57 | region_size = 0; | 57 | region_size = 0; |
| 58 | } | 58 | } |
| 59 | 59 | ||
| 60 | bool IsInSpace(const u8 *ptr) | 60 | bool IsInSpace(const u8* ptr) { |
| 61 | { | ||
| 62 | return (ptr >= region) && (ptr < (region + region_size)); | 61 | return (ptr >= region) && (ptr < (region + region_size)); |
| 63 | } | 62 | } |
| 64 | 63 | ||
| 65 | // Cannot currently be undone. Will write protect the entire code region. | 64 | // Cannot currently be undone. Will write protect the entire code region. |
| 66 | // Start over if you need to change the code (call FreeCodeSpace(), AllocCodeSpace()). | 65 | // Start over if you need to change the code (call FreeCodeSpace(), AllocCodeSpace()). |
| 67 | void WriteProtect() | 66 | void WriteProtect() { |
| 68 | { | ||
| 69 | WriteProtectMemory(region, region_size, true); | 67 | WriteProtectMemory(region, region_size, true); |
| 70 | } | 68 | } |
| 71 | 69 | ||
| 72 | void ResetCodePtr() | 70 | void ResetCodePtr() { |
| 73 | { | ||
| 74 | T::SetCodePtr(region); | 71 | T::SetCodePtr(region); |
| 75 | } | 72 | } |
| 76 | 73 | ||
| 77 | size_t GetSpaceLeft() const | 74 | size_t GetSpaceLeft() const { |
| 78 | { | ||
| 79 | return region_size - (T::GetCodePtr() - region); | 75 | return region_size - (T::GetCodePtr() - region); |
| 80 | } | 76 | } |
| 81 | 77 | ||
| 82 | u8 *GetBasePtr() { | 78 | u8* GetBasePtr() { |
| 83 | return region; | 79 | return region; |
| 84 | } | 80 | } |
| 85 | 81 | ||
| 86 | size_t GetOffset(const u8 *ptr) const { | 82 | size_t GetOffset(const u8* ptr) const { |
| 87 | return ptr - region; | 83 | return ptr - region; |
| 88 | } | 84 | } |
| 89 | }; | 85 | }; |