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authorLeonid Logvinov <logvinov.leon@gmail.com>2019-01-10 18:21:05 +0800
committerLeonid Logvinov <logvinov.leon@gmail.com>2019-01-10 18:21:05 +0800
commit7ae9e79235ed3b7eb110b0a1e88338b3965f44da (patch)
tree5339e9548142eb6ec3e7a7e4288cb5e5b1a582cc /packages/sol-tracing-utils/src/instructions.ts
parent15c9479ebeca57e7c275cd2e73ca3daad03a412f (diff)
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Rename sol-trace-based-tools-common to sol-tracing-utils
Diffstat (limited to 'packages/sol-tracing-utils/src/instructions.ts')
-rw-r--r--packages/sol-tracing-utils/src/instructions.ts23
1 files changed, 23 insertions, 0 deletions
diff --git a/packages/sol-tracing-utils/src/instructions.ts b/packages/sol-tracing-utils/src/instructions.ts
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index 000000000..40987dbe5
--- /dev/null
+++ b/packages/sol-tracing-utils/src/instructions.ts
@@ -0,0 +1,23 @@
+import { constants } from './constants';
+
+const isPush = (inst: number) => inst >= constants.PUSH1 && inst <= constants.PUSH32;
+
+const pushDataLength = (inst: number) => inst - constants.PUSH1 + 1;
+
+const instructionLength = (inst: number) => (isPush(inst) ? pushDataLength(inst) + 1 : 1);
+
+export const getPcToInstructionIndexMapping = (bytecode: Uint8Array) => {
+ const result: {
+ [programCounter: number]: number;
+ } = {};
+ let byteIndex = 0;
+ let instructionIndex = 0;
+ while (byteIndex < bytecode.length) {
+ const instruction = bytecode[byteIndex];
+ const length = instructionLength(instruction);
+ result[byteIndex] = instructionIndex;
+ byteIndex += length;
+ instructionIndex += 1;
+ }
+ return result;
+};